一、k8s架构规划
1.k8s逻辑架构
2.k8s实验拓扑
3.k8s三条网络
4.主机规划
| 主机名 | ip | cpu | 内存 | 角色 |
|---|---|---|---|---|
| kjdow7-11.host.com | 10.4.7.11 | 2 | 3 | k8s代理节点1 |
| kjdow7-12.host.com | 10.4.7.12 | 2 | 3 | k8s代理节点2 |
| kjdow7-21.host.com | 10.4.7.21 | 2 | 4 | k8s运算节点1 |
| kjdow7-22.host.com | 10.4.7.22 | 2 | 4 | k8s运算节点1 |
| kjdow7-200.host.com | 10.4.7.200 | 2 | 3 | k8s运维节点1 |
5.软件版本
| 组件 | 版本 | 备注 |
|---|---|---|
| harbor | 1.7.5以上 | 私有仓库 |
| etcd | 3.3.3以下（建议3.1.*稳定版） | 数据库 |
| k8s | 1.15（生产建议） | k8s主要软件 |
harbor私有仓库1.7.5版本以下爆出有漏洞，可能被越权获取管理员权限
k8s版本较多，1.16版之后有一个质的更新，删除了一些旧组件，增添了新特性，目前使用的公司少，文档少，暂时不建议在生产上部署
二、二进制安装部署k8s集群
1.k8s前置工作-bind9安装
在实验环境中，网站需要进行域名解析，需要搭建本地DNS服务，可以使用linux的开源工具bind进行部署
#在每台主机上预先安装软件
yum install wget net-tools telnet tree nmap sysstat lrzsz dos2unix bind-utils -y
1.1 安装bind9软件
#在7-11主机上进行操作
##1.安装软件
7-11 ~]# yum install bind -y
##2.配置bind主配置文件
7-11 ~]# vim /etc/named.conf
listen-on port 53 { 10.4.7.11; }; ##127.0.0.1修改为any，表示监听全部地址
allow-query { any; }; #表示别的机器也可以使用
forwarders { 223.5.5.5; }; #如果没有解析，就转发给此地址进行解析
recursion yes; #采用递归查询
dnssec-enable no;
dnssec-validation no;
7-11 ~]# named-checkconf #检查配置文件是否有错
1.2 配置bind9
#配置区域配置文件
7-11 ~]# vim /etc/named.rfc1912.zones
zone "host.com" IN { #主机域
type master;
file "host.com.zone";
allow-update { 10.4.7.11; };
};
zone "phc-dow.com" IN { #业务域
type master;
file "phc-dow.com.zone";
allow-update { 10.4.7.11; };
};
#配置区域数据文件
[root@kjdow7-11 ~]# cat /var/named/host.com.zone
$ORIGIN host.com.
$TTL 600 ; 10 minutes
@ IN SOA dns.host.com. dnsadmin.host.com. (
2020010201 ; serial
10800 ; refresh (3 hours)
900 ; retry (15 minutes)
604800 ; expire (1 week)
86400 ; minimum (1 day)
)
NS dns.host.com.
$TTL 60 ; 1 minute
dns A 10.4.7.11
kjdow7-11 A 10.4.7.11
kjdow7-12 A 10.4.7.12
kjdow7-21 A 10.4.7.21
kjdow7-22 A 10.4.7.22
kjdow7-200 A 10.4.7.200
7-11 ~]# vim /var/named/phc-dow.com.zone
$ORIGIN phc-dow.com.
$TTL 600 ; 10 minutes
@ IN SOA dns.phc-dow.com. dnsadmin.phc-dow.com. (
2020010201 ; serial
10800 ; refresh (3 hours)
900 ; retry (15 minutes)
604800 ; expire (1 week)
86400 ; minimum (1 day)
)
NS dns.phc-dow.com.
$TTL 60 ; 1 minute
dns A 10.4.7.11
注意：serial字段在每次修改配置文件时数值+1
1.3，启动并验证DNS
#启动服务
7-11 ~]# systemctl start named
7-11 ~]# systemctl enable named
Created symlink from /etc/systemd/system/multi-user.target.wants/named.service to /usr/lib/systemd/system/named.service.
[root@kjdow7-11 ~]# netstat -lntup | grep 53
tcp 0 0 10.4.7.11:53 0.0.0.0:* LISTEN 6898/named
tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN 6898/named
tcp6 0 0 ::1:53 :::* LISTEN 6898/named
tcp6 0 0 ::1:953 :::* LISTEN 6898/named
udp 0 0 10.4.7.11:53 0.0.0.0:* 6898/named
udp 0 0 0.0.0.0:832 0.0.0.0:* 5323/rpcbind
udp6 0 0 ::1:53 :::* 6898/named
udp6 0 0 :::832 :::* 5323/rpcbind
#验证
7-11 ~]# dig -t A kjdow7-22.host.com @10.4.7.11 +short
10.4.7.22
#在其他主机上设置dns为10.4.7.11即可解析
~]# cat /etc/resolv.conf
# Generated by NetworkManager
search host.com #短域名解析
nameserver 10.4.7.11
2.K8S前置准备工作--准备签发证书环境
在kjdow7-200上进行操作
2.1 安装cfssl
7-200 ~]# curl -s -L -o /usr/bin/cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
7-200 ~]# curl -s -L -o /usr/bin/cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
7-200 ~]# curl -s -L -o /usr/bin/cfssl-certinfo https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
7-200 ~]# chmod +x /usr/bin/cfssl*
2.2 配置
创建生成CA证书的JSON配置文件
7-200 ~]# mkdir /opt/certs
7-200 ~]# vim /opt/certs/ca-config.json
{
"signing": {
"default": {
"expiry": "175200h"
},
"profiles": {
"server": {
"expiry": "175200h",
"usages": [
"signing",
"key encipherment",
"server auth"
]
},
"client": {
"expiry": "175200h",
"usages": [
"signing",
"key encipherment",
"client auth"
]
},
"peer": {
"expiry": "175200h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
证书类型
client certificate： 客户端使用，用于服务端认证客户端,例如etcdctl、etcd proxy、fleetctl、docker客户端
server certificate: 服务端使用，客户端以此验证服务端身份,例如docker服务端、kube-apiserver
peer certificate: 双向证书，用于etcd集群成员间通信
创建生成CA证书签名请求（csr）的JSON配置文件
/opt/certs/ca-csr.json
{
"CN": "kubernetes-ca",
"hosts": [
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "phc-dow",
"OU": "kjdow"
}
],
"ca": {
"expiry": "175200h"
}
}
CN: Common Name，浏览器使用该字段验证网站是否合法，一般写的是域名。非常重要。浏览器使用该字段验证网站是否合法
C: Country， 国家
ST: State，州，省
L: Locality，地区，城市
O: Organization Name，组织名称，公司名称
OU: Organization Unit Name，组织单位名称，公司部门
生成CA证书和私钥
7-200 ~]# cd /opt/certs
7-200 certs]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca
2019/01/18 09:31:19 [INFO] generating a new CA key and certificate from CSR
2019/01/18 09:31:19 [INFO] generate received request
2019/01/18 09:31:19 [INFO] received CSR
2019/01/18 09:31:19 [INFO] generating key: rsa-2048
2019/01/18 09:31:19 [INFO] encoded CSR
2019/01/18 09:31:19 [INFO] signed certificate with serial number 345276964513449660162382535043012874724976422200
7-200 certs]# ls -l
-rw-r--r-- 1 root root 836 Jan 16 11:04 ca-config.json
-rw-r--r-- 1 root root 332 Jan 16 11:10 ca-csr.json
-rw------- 1 root root 1675 Jan 16 11:17 ca-key.pem
-rw-r--r-- 1 root root 1001 Jan 16 11:17 ca.csr
-rw-r--r-- 1 root root 1354 Jan 16 11:17 ca.pem
生成ca.pem、ca.csr、ca-key.pem(CA私钥,需妥善保管)
3.K8S前置准备工作--docker环境安装
在kjdow7-21，kjdow7-22，kjdow7-200上进行操作
3.1 安装docker
curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun
这条命令会自动添加docker源，并自动安装软件
3.2 配置docker
~]# mkdir /etc/docker /data/docker -p
~]# vi /etc/docker/daemon.json
{
"graph": "/data/docker",
"storage-driver": "overlay",
"registry-mirrors": ["https://dockerhub.azk8s.cn", "https://docker.mirrors.ustc.edu.cn"],
"insecure-registries": ["registry.access.redhat.com","quay.io","harbor.phc-dow.com"],
"bip": "172.7.21.1/24",
"exec-opts": ["native.cgroupdriver=systemd"],
"live-restore": true
}
注意：这里bip要根据宿主机ip变化,在22上bip改为172.7.22.1/24，在200上bip改为172.7.200.1/24
执行docker info出现如下警告
WARNING: bridge-nf-call-iptables is disabled WARNING: bridge-nf-call-ip6tables is disabled解决办法：
vi /etc/sysctl.conf #末尾添加以下两行 net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 #最后执行 sysctl -p #启用配置
4、K8S前置准备工作--私有仓库harbor搭建
在kjdow7-200上进行操作
4.1 下载软件并安装
7-200 src]# tar xf harbor-offline-installer-v1.8.5.tgz -C /opt
7-200 src]# cd /opt
[root@kjdow7-200 opt]# ls
certs containerd harbor src
7-200 opt]# mv harbor harbor-v1.8.5
7-200 opt]# ln -s harbor-v1.8.5 harbor
4.2 配置
7-200 harbor]# vim harbor.yml
hostname: harbor.phc-dow.com
http:
# port for http, default is 80. If https enabled, this port will redirect to https port
port: 180
harbor_admin_password: 123456
data_volume: /data/harbor
log:
location: /data/harbor/logs
7-200 harbor]# mkdir /data/harbor/logs -p
4.3 安装 docker-compose依赖包
7-200 harbor]# yum install docker-compose -y
7-200 harbor]# rpm -qa docker-compose
docker-compose-1.18.0-4.el7.noarch
harbor的安装依赖docker-compose
4.4 安装harbor
7-200 harbor]# ./install.sh
7-200 harbor]# docker-compose ps
Name Command State Ports
--------------------------------------------------------------------------------------
harbor-core /harbor/start.sh Up
harbor-db /entrypoint.sh postgres Up 5432/tcp
harbor-jobservice /harbor/start.sh Up
harbor-log /bin/sh -c /usr/local/bin/ ... Up 127.0.0.1:1514->10514/tcp
harbor-portal nginx -g daemon off; Up 80/tcp
nginx nginx -g daemon off; Up 0.0.0.0:180->80/tcp
redis docker-entrypoint.sh redis ... Up 6379/tcp
registry /entrypoint.sh /etc/regist ... Up 5000/tcp
registryctl /harbor/start.sh Up
4.5 配置harbor的dns内网解析
7-11 ~]# vi /var/named/phc-dow.com.zone
2020010202 ; serial #serial的值+1
harbor A 10.4.7.200 #添加harbor域名的A记录
#检查域名解析
7-11 ~]# dig -t A harbor.phc-dow.com @10.4.7.11 +short
10.4.7.200
4.6 安装nginx并配置
7-200 harbor]# yum install nginx -y
7-200 harbor]# vim /etc/nginx/conf.d/harbor.phc-dow.conf
server {
listen 80;
server_name harbor.phc-dow.com;
client_max_body_size 1000m;
location / {
proxy_pass http://127.0.0.1:180;
}
}
7-200 harbor]# nginx -t
7-200 harbor]# systemctl start nginx
4.7 访问并上传镜像
##通过浏览器访问 harbor.phc-dow.com
7-200 ~]# docker pull nginx:1.7.9
7-200 ~]# docker images
nginx 1.7.9 84581e99d807 4 years ago 91.7MB
7-200 ~]# docker tag 84581e99d807 harbor.phc-dow.com/public/nginx:v1.7.9
7-200 ~]# docker login harbor.phc-dow.com
Username: admin
Password:
7-200 ~]# docker push harbor.phc-dow.com/public/nginx:v1.7.9
5、安装部署主控节点服务--etcd集群
5.1 创建证书文件
etcd主机之间进行通信需要使用https，因此需要证书文件，证书类型是peer
在kjdow7-22上进行操作
vim /opt/certs/etcd-peer-csr.json
{
"CN": "etcd-peer",
"hosts": [
"10.4.7.11",
"10.4.7.12",
"10.4.7.21",
"10.4.7.22"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "phc-dow",
"OU": "kjdow"
}
]
}
hosts字段把可能安装etcd的ip全部写进去，不能写地址段，只能写ip地址
生成etcd证书和私钥
7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=peer etcd-peer-csr.json | cfssljson -bare etcd-peer
2020/01/09 01:21:58 [INFO] generate received request
2020/01/09 01:21:58 [INFO] received CSR
2020/01/09 01:21:58 [INFO] generating key: rsa-2048
2020/01/09 01:21:59 [INFO] encoded CSR
2020/01/09 01:21:59 [INFO] signed certificate with serial number 18968919947780963988803677724704789922238134918
2020/01/09 01:21:59 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
###检查生成的证书
7-200 certs]# ls -l | grep etcd
-rw-r--r-- 1 root root 1078 Jan 9 01:21 etcd-peer.csr
-rw-r--r-- 1 root root 373 Jan 9 01:21 etcd-peer-csr.json
-rw------- 1 root root 1675 Jan 9 01:21 etcd-peer-key.pem
-rw-r--r-- 1 root root 1460 Jan 9 01:21 etcd-peer.pem
注意：ca证书前面已经签发，这里直接使用
5.2 搭建etcd
在kjdow7-12，kjdow7-21，kjdow7-22上进行操作，分别搭建etcd
1） 下载安装etcd
7-12 ~]# cd /opt/src
7-12 src]# tar xf etcd-v3.1.20-linux-amd64.tar.gz -C /opt
7-12 opt]# mv etcd-v3.1.20-linux-amd64 etcd-v3.1.20
7-12 opt]# ln -s etcd-v3.1.20 etcd
2）安装与配置
#创建用户
[root@kjdow7-12 opt]# useradd -s /sbin/nologin -M etcd
[root@kjdow7-12 opt]# id etcd
uid=1000(etcd) gid=1000(etcd) groups=1000(etcd)
##创建目录
[root@kjdow7-12 opt]# mkdir -p /data/etcd /data/logs/etcd-server
#创建目录，并报备证书、私钥
[root@kjdow7-12 opt]# mkdir -p /opt/etcd/certs
[root@kjdow7-12 certs]# scp kjdow7-200:/opt/certs/ca.pem .
[root@kjdow7-12 certs]# scp kjdow7-200:/opt/certs/etcd-peer.pem .
[root@kjdow7-12 certs]# scp kjdow7-200:/opt/certs/etcd-peer-key.pem .
[root@kjdow7-12 certs]# chown -R etcd.etcd /opt/etcd/certs/
#为目录授权
[root@kjdow7-12 certs]# chown -R etcd.etcd /data/etcd /data/logs/etcd-server/
[root@kjdow7-12 certs]# chown -R etcd.etcd /opt/etcd-v3.1.20/
3) 使用supervisor软件进行管理启动
##创建etcd服务启动脚本
[root@kjdow7-12 ~]# vim /opt/etcd/etcd-server-startup.sh
#!/bin/sh
./etcd --name etcd-server-7-12
--data-dir /data/etcd/etcd-server
--listen-peer-urls https://10.4.7.12:2380
--listen-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379
--quota-backend-bytes 8000000000
--initial-advertise-peer-urls https://10.4.7.12:2380
--advertise-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379
--initial-cluster etcd-server-7-12=https://10.4.7.12:2380,etcd-server-7-21=https://10.4.7.21:2380,etcd-server-7-22=https://10.4.7.22:2380
--ca-file ./certs/ca.pem
--cert-file ./certs/etcd-peer.pem
--key-file ./certs/etcd-peer-key.pem
--client-cert-auth
--trusted-ca-file ./certs/ca.pem
--peer-ca-file ./certs/ca.pem
--peer-cert-file ./certs/etcd-peer.pem
--peer-key-file ./certs/etcd-peer-key.pem
--peer-client-cert-auth
--peer-trusted-ca-file ./certs/ca.pem
--log-output stdout
[root@kjdow7-12 ~]# chmod +x /opt/etcd/etcd-server-startup.sh
##安装并启动supervisor软件
[root@kjdow7-12 ~]# yum install supervisor -y
[root@kjdow7-12 ~]# systemctl start supervisord
[root@kjdow7-12 ~]# systemctl enable supervisord
##创建etcd-server的启动配置
[root@kjdow7-12 ~]# vim /etc/supervisord.d/etcd-server.ini
[program:etcd-server-7-12]
command=/opt/etcd/etcd-server-startup.sh ; the program (relative uses PATH, can take args)
numprocs=1 ; number of processes copies to start (def 1)
directory=/opt/etcd ; directory to cwd to before exec (def no cwd)
autostart=true ; start at supervisord start (default: true)
autorestart=true ; retstart at unexpected quit (default: true)
startsecs=22 ; number of secs prog must stay running (def. 1)
startretries=3 ; max # of serial start failures (default 3)
exitcodes=0,2 ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT ; signal used to kill process (default TERM)
stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
user=etcd ; setuid to this UNIX account to run the program
redirect_stderr=false ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/etcd-server/etcd.stdout.log ; stdout log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4 ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false ; emit events on stdout writes (default false)
stderr_logfile=/data/logs/etcd-server/etcd.stderr.log ; stderr log path, NONE for none; default AUTO
stderr_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stderr_logfile_backups=4 ; # of stderr logfile backups (default 10)
stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stderr_events_enabled=false ; emit events on stderr writes (default false)
注意： ：在ini文件后面可以看情况加上以下2行配置文件
killasgroup=true #这个东西主要用于，supervisord管理的子进程，这个子进程本身还有，子进程。那么我们如果仅仅干掉supervisord的子进程的话，子进程的子进程，有可能会变成孤儿进程。所以咱们可以设置可个选项，把整个该子进程的，整个进程组都干掉。 设置为true的话，一般killasgroup也会被设置为true。需要注意的是，该选项发送的是stop信号，默认为false。。非必须设置。
stopasgroup=true #这个和上面的stopasgroup类似，不过发送的是kill信号
注意：etcd集群各主机启动配置略有不同，配置其他节点时注意修改。
###启动etcd服务并检查
[root@kjdow7-12 ~]# supervisorctl update
etcd-server-7-12: added process group
[root@kjdow7-12 ~]# supervisorctl status
etcd-server-7-12 RUNNING pid 8545, uptime 0:00:23
4) 在其他节点上进行安装
请参照1到3步骤，注意修改配置的ip地址
[root@kjdow7-21 certs]# supervisorctl status
etcd-server-7-21 RUNNING pid 9232, uptime 0:00:30
[root@kjdow7-22 ~]# supervisorctl status
etcd-server-7-22 RUNNING pid 9282, uptime 0:00:30
5）检查集群状态
3台均启动后，检查集群状态
[root@kjdow7-12 ~]# /opt/etcd/etcdctl cluster-health
member 988139385f78284 is healthy: got healthy result from http://127.0.0.1:2379
member 5a0ef2a004fc4349 is healthy: got healthy result from http://127.0.0.1:2379
member f4a0cb0a765574a8 is healthy: got healthy result from http://127.0.0.1:2379
cluster is healthy
[root@kjdow7-12 ~]# /opt/etcd/etcdctl member list
988139385f78284: name=etcd-server-7-22 peerURLs=https://10.4.7.22:2380 clientURLs=http://127.0.0.1:2379,https://10.4.7.22:2379 isLeader=false
5a0ef2a004fc4349: name=etcd-server-7-21 peerURLs=https://10.4.7.21:2380 clientURLs=http://127.0.0.1:2379,https://10.4.7.21:2379 isLeader=false
f4a0cb0a765574a8: name=etcd-server-7-12 peerURLs=https://10.4.7.12:2380 clientURLs=http://127.0.0.1:2379,https://10.4.7.12:2379 isLeader=true
6、安装部署主控节点服务--apiserver
在kjdow7-21、kjdow7-22上进行操作
6.1 下载k8s软件包
[root@kjdow7-21 src]# tar xf kubernetes-server-linux-amd64-v1.15.4.tar.gz -C /opt
[root@kjdow7-21 ~]# cd /opt
[root@kjdow7-21 opt]# ls
containerd etcd etcd-v3.1.20 kubernetes src
[root@kjdow7-21 opt]# mv kubernetes kubernetes-v1.15.4
[root@kjdow7-21 opt]# ln -s kubernetes-v1.15.4 kubernetes
[root@kjdow7-21 opt]# cd kubernetes
[root@kjdow7-21 kubernetes]# ls
addons kubernetes-src.tar.gz LICENSES server
[root@kjdow7-21 kubernetes]# ll
total 27212
drwxr-xr-x 2 root root 6 Oct 16 03:34 addons
-rw-r--r-- 1 root root 26654123 Oct 16 03:34 kubernetes-src.tar.gz
-rw-r--r-- 1 root root 1205293 Oct 16 03:34 LICENSES
drwxr-xr-x 3 root root 17 Oct 16 03:30 server
[root@kjdow7-21 kubernetes]# rm -f kubernetes-src.tar.gz #这是源码包，删掉
[root@kjdow7-21 kubernetes]# cd server/bin/
[root@kjdow7-21 bin]# ls
apiextensions-apiserver cloud-controller-manager.tar kube-apiserver kube-controller-manager kubectl kube-proxy.docker_tag kube-scheduler.docker_tag
cloud-controller-manager hyperkube kube-apiserver.docker_tag kube-controller-manager.docker_tag kubelet kube-proxy.tar kube-scheduler.tar
cloud-controller-manager.docker_tag kubeadm kube-apiserver.tar kube-controller-manager.tar kube-proxy kube-scheduler mounter
[root@kjdow7-21 bin]# rm -f *.tar #这些是kubeadm安装所需的镜像包，删掉
[root@kjdow7-21 bin]# rm -rf *_tag
[root@kjdow7-21 bin]# ll
total 885008
-rwxr-xr-x 1 root root 43547104 Oct 16 03:34 apiextensions-apiserver
-rwxr-xr-x 1 root root 100610080 Oct 16 03:34 cloud-controller-manager
-rwxr-xr-x 1 root root 200726128 Oct 16 03:34 hyperkube
-rwxr-xr-x 1 root root 40190400 Oct 16 03:34 kubeadm
-rwxr-xr-x 1 root root 164571520 Oct 16 03:34 kube-apiserver
-rwxr-xr-x 1 root root 116462560 Oct 16 03:34 kube-controller-manager
-rwxr-xr-x 1 root root 42993696 Oct 16 03:34 kubectl
-rwxr-xr-x 1 root root 119686160 Oct 16 03:34 kubelet
-rwxr-xr-x 1 root root 36991584 Oct 16 03:34 kube-proxy
-rwxr-xr-x 1 root root 38790240 Oct 16 03:34 kube-scheduler
-rwxr-xr-x 1 root root 1648224 Oct 16 03:34 mounter
[root@kjdow7-21 ~]# ln -s /opt/kubernetes/server/bin/kubectl /usr/bin/kubectl
6.2 集群规划
| 主机名 | 角色 | ip |
|---|---|---|
| kjdow7-21.host.com | kube-apiserver | 10.4.7.21 |
| kjdow7-22.host.com | kube-apiserver | 10.4.7.22 |
| kjdow7-11.host.com | 4层负载均衡 | 10.4.7.11 |
| kjdow7-12.host.com | 4层负载均衡 | 10.4.7.12 |
注意：这里
10.4.7.11和10.4.7.12使用nginx做4层负载均衡器，用keepalived跑一个vip：10.4.7.10，代理两个kube-apiserver，实现高可用这里部署文档以kjdow7-21.host.com主机为例，另外一台运算节点安装部署方法类似
6.3 签发证书
1）签发client证书
apiserver与etcd进行通信时，apiserver是客户端，etcd是服务端，因此需要client证书。
在kjdow7-200上进行操作
创建生成证书签名请求（csr）的JSON配置文件
[root@kjdow7-200 ~]# vim /opt/certs/client-csr.json
{
"CN": "k8s-node",
"hosts": [
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "phc-dow",
"OU": "kjdow"
}
]
}
生成client证书和私钥
[root@kjdow7-200 ~]# cd /opt/certs/
[root@kjdow7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client client-csr.json | cfssljson -bare client
2020/01/09 04:00:27 [INFO] generate received request
2020/01/09 04:00:27 [INFO] received CSR
2020/01/09 04:00:27 [INFO] generating key: rsa-2048
2020/01/09 04:00:29 [INFO] encoded CSR
2020/01/09 04:00:29 [INFO] signed certificate with serial number 24514806972076249411305307112862513929803875017
2020/01/09 04:00:29 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
##检查生成的证书、私钥
[root@kjdow7-200 certs]# ls -l|grep client
-rw-r--r-- 1 root root 1005 Jan 9 04:00 client.csr
-rw-r--r-- 1 root root 289 Jan 9 03:59 client-csr.json
-rw------- 1 root root 1675 Jan 9 04:00 client-key.pem
-rw-r--r-- 1 root root 1395 Jan 9 04:00 client.pem
2）签发kube-apiserver证书
其他客户端来找apiserver时也需要ssl认证，这是apiserver的server端证书。
创建生成证书签名请求（csr）的JSON配置文件
[root@kjdow7-200 certs]# vim /opt/certs/apiserver-csr.json
{
"CN": "apiserver",
"hosts": [
"127.0.0.1",
"192.168.0.1",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local",
"10.4.7.10",
"10.4.7.21",
"10.4.7.22",
"10.4.7.23"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "phc-dow",
"OU": "kjdow"
}
]
}
生成kube-apiserver证书和私钥
[root@kjdow7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server apiserver-csr.json | cfssljson -bare apiserver
2020/01/09 04:07:00 [INFO] generate received request
2020/01/09 04:07:00 [INFO] received CSR
2020/01/09 04:07:00 [INFO] generating key: rsa-2048
2020/01/09 04:07:01 [INFO] encoded CSR
2020/01/09 04:07:01 [INFO] signed certificate with serial number 93669080945735753983245798274605600027216431034
2020/01/09 04:07:01 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@kjdow7-200 certs]# echo $?
0
[root@kjdow7-200 certs]# ls -l|grep apiserver
-rw-r--r-- 1 root root 1257 Jan 9 04:07 apiserver.csr
-rw-r--r-- 1 root root 571 Jan 9 04:05 apiserver-csr.json
-rw------- 1 root root 1675 Jan 9 04:07 apiserver-key.pem
-rw-r--r-- 1 root root 1623 Jan 9 04:07 apiserver.pem
3) 拷贝证书至各运算节点，并创建配置
在kjdow7-21、kjdow7-22上进行操作
##拷贝证书、私钥，注意私钥文件属性600
[root@kjdow7-21 certs]# mkdir -p /opt/kubernetes/server/bin/certs
[root@kjdow7-21 certs]# cd /opt/kubernetes/server/bin/certs
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/ca.pem .
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/ca-key.pem .
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/client.pem .
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/client-key.pem .
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/apiserver.pem .
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/apiserver-key.pem .
6.4 配置，并启动服务
在kjdow7-21、kjdow7-22上进行操作
[root@kjdow7-21 certs]# mkdir -p /opt/kubernetes/server/bin/conf
[root@kjdow7-21 certs]# vi /opt/kubernetes/server/bin/conf/audit.yaml
apiVersion: audit.k8s.io/v1beta1 # This is required.
kind: Policy
# Don't generate audit events for all requests in RequestReceived stage.
omitStages:
- "RequestReceived"
rules:
# Log pod changes at RequestResponse level
- level: RequestResponse
resources:
- group: ""
# Resource "pods" doesn't match requests to any subresource of pods,
# which is consistent with the RBAC policy.
resources: ["pods"]
# Log "pods/log", "pods/status" at Metadata level
- level: Metadata
resources:
- group: ""
resources: ["pods/log", "pods/status"]
# Don't log requests to a configmap called "controller-leader"
- level: None
resources:
- group: ""
resources: ["configmaps"]
resourceNames: ["controller-leader"]
# Don't log watch requests by the "system:kube-proxy" on endpoints or services
- level: None
users: ["system:kube-proxy"]
verbs: ["watch"]
resources:
- group: "" # core API group
resources: ["endpoints", "services"]
# Don't log authenticated requests to certain non-resource URL paths.
- level: None
userGroups: ["system:authenticated"]
nonResourceURLs:
- "/api*" # Wildcard matching.
- "/version"
# Log the request body of configmap changes in kube-system.
- level: Request
resources:
- group: "" # core API group
resources: ["configmaps"]
# This rule only applies to resources in the "kube-system" namespace.
# The empty string "" can be used to select non-namespaced resources.
namespaces: ["kube-system"]
# Log configmap and secret changes in all other namespaces at the Metadata level.
- level: Metadata
resources:
- group: "" # core API group
resources: ["secrets", "configmaps"]
# Log all other resources in core and extensions at the Request level.
- level: Request
resources:
- group: "" # core API group
- group: "extensions" # Version of group should NOT be included.
# A catch-all rule to log all other requests at the Metadata level.
- level: Metadata
# Long-running requests like watches that fall under this rule will not
# generate an audit event in RequestReceived.
omitStages:
- "RequestReceived"
创建启动脚本
[root@kjdow7-21 certs]# vim /opt/kubernetes/server/bin/kube-apiserver.sh
#!/bin/bash
./kube-apiserver
--apiserver-count 2
--audit-log-path /data/logs/kubernetes/kube-apiserver/audit-log
--audit-policy-file ./conf/audit.yaml
--authorization-mode RBAC
--client-ca-file ./certs/ca.pem
--requestheader-client-ca-file ./certs/ca.pem
--enable-admission-plugins NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota
--etcd-cafile ./certs/ca.pem
--etcd-certfile ./certs/client.pem
--etcd-keyfile ./certs/client-key.pem
--etcd-servers https://10.4.7.12:2379,https://10.4.7.21:2379,https://10.4.7.22:2379
--service-account-key-file ./certs/ca-key.pem
--service-cluster-ip-range 192.168.0.0/16
--service-node-port-range 3000-29999
--target-ram-mb=1024
--kubelet-client-certificate ./certs/client.pem
--kubelet-client-key ./certs/client-key.pem
--log-dir /data/logs/kubernetes/kube-apiserver
--tls-cert-file ./certs/apiserver.pem
--tls-private-key-file ./certs/apiserver-key.pem
--v 2
调整权限和目录
[root@kjdow7-21 certs]# chmod +x /opt/kubernetes/server/bin/kube-apiserver.sh
[root@kjdow7-21 certs]# mkdir -p /data/logs/kubernetes/kube-apiserver
创建supervisor配置
[root@kjdow7-21 certs]# vim /etc/supervisord.d/kube-apiserver.ini
[program:kube-apiserver-7-21]
command=/opt/kubernetes/server/bin/kube-apiserver.sh ; the program (relative uses PATH, can take args)
numprocs=1 ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin ; directory to cwd to before exec (def no cwd)
autostart=true ; start at supervisord start (default: true)
autorestart=true ; retstart at unexpected quit (default: true)
startsecs=22 ; number of secs prog must stay running (def. 1)
startretries=3 ; max # of serial start failures (default 3)
exitcodes=0,2 ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT ; signal used to kill process (default TERM)
stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
user=root ; setuid to this UNIX account to run the program
redirect_stderr=false ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-apiserver/apiserver.stdout.log ; stdout log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4 ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false ; emit events on stdout writes (default false)
stderr_logfile=/data/logs/kubernetes/kube-apiserver/apiserver.stderr.log ; stderr log path, NONE for none; default AUTO
stderr_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stderr_logfile_backups=4 ; # of stderr logfile backups (default 10)
stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stderr_events_enabled=false ; emit events on stderr writes (default false)
stopasgroup=true
启动服务并检查
[root@kjdow7-21 bin]# supervisorctl update
kube-apiserver-7-21: added process group
[root@kjdow7-21 bin]# supervisorctl status
etcd-server-7-21 RUNNING pid 9232, uptime 1:36:06
kube-apiserver-7-21 RUNNING pid 10804, uptime 0:00:35
[root@kjdow7-21 ~]# netstat -lntup | grep kub
tcp 0 0 127.0.0.1:8080 0.0.0.0:* LISTEN 10805/./kube-apiser
tcp6 0 0 :::6443 :::* LISTEN 10805/./kube-apiser
6.5 安装部署启动检查所有集群规划主机上的kube-apiserver
重复6.1到6.4步骤，注意修改配置文件为相应的地址
[root@kjdow7-22 bin]# supervisorctl status
etcd-server-7-22 RUNNING pid 9282, uptime 3:03:39
kube-apiserver-7-22 RUNNING pid 10895, uptime 0:05:02
[root@kjdow7-22 bin]# netstat -lntup | grep kube
tcp 0 0 127.0.0.1:8080 0.0.0.0:* LISTEN 10896/./kube-apiser
tcp6 0 0 :::6443 :::* LISTEN 10896/./kube-apiser
7、安装部署主控节点L4反代api-server
在kjdow7-11、kjdow7-12上进行操作
7.1 安装配置nginx
[root@kjdow7-11 ~]# yum install nginx -y
#配置nginx配置文件做四层负载均衡
vim /etc/nginx/nginx.conf
stream {
upstream kube-apiserver {
server 10.4.7.21:6443 max_fails=3 fail_timeout=30s;
server 10.4.7.22:6443 max_fails=3 fail_timeout=30s;
}
server {
listen 7443;
proxy_connect_timeout 2s;
proxy_timeout 900s;
proxy_pass kube-apiserver;
}
}
7.2 安装配置keepalived
[root@kjdow7-11 ~]# yum install keepalived -y
#在11和12两台上分别配置检测脚本
[root@kjdow7-11 ~]# vi /etc/keepalived/check_port.sh
#!/bin/bash
#keepalived 监控端口脚本
#使用方法：
#在keepalived的配置文件中
#vrrp_script check_port {#创建一个vrrp_script脚本,检查配置
# script "/etc/keepalived/check_port.sh 7443" #配置监听的端口
# interval 2 #检查脚本的频率,单位（秒）
#}
CHK_PORT=$1
if [ -n "$CHK_PORT" ];then
PORT_PROCESS=`ss -lnt|grep $CHK_PORT|wc -l`
if [ $PORT_PROCESS -eq 0 ];then
echo "Port $CHK_PORT Is Not Used,End."
exit 1
fi
else
echo "Check Port Cant Be Empty!"
fi
keepalived主 在kjdow7-11上进行操作
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id 10.4.7.11
}
vrrp_script chk_nginx {
script "/etc/keepalived/check_port.sh 7443"
interval 2
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface eth1 #设置监听的网卡，按照需求配置
virtual_router_id 251
priority 100
advert_int 1
mcast_src_ip 10.4.7.11
nopreempt
authentication {
auth_type PASS
auth_pass 11111111
}
track_script {
chk_nginx
}
virtual_ipaddress {
10.4.7.10
}
}
keepalived备 在kjdow7-12上进行操作
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id 10.4.7.12
}
vrrp_script chk_nginx {
script "/etc/keepalived/check_port.sh 7443"
interval 2
weight -20
}
vrrp_instance VI_1 {
state BACKUP
interface eth1 #设置监听的网卡，按照需求配置
virtual_router_id 251
mcast_src_ip 10.4.7.12
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 11111111
}
track_script {
chk_nginx
}
virtual_ipaddress {
10.4.7.10
}
}
7.3 启动服务并检查
在kjdow7-11、kjdow7-12上进行操作
systemctl start keepalived
systemctl start nginx
systemctl enable nginx
systemctl enable keepalived
ip add | grep 10.4.7.10
8.安装部署主控节点控制器服务controller-manager
在kjdow7-21、kjdow7-22上进行操作
8.1 创建启动脚本
[root@kjdow7-21 ~]# vim /opt/kubernetes/server/bin/kube-controller-manager.sh
#!/bin/sh
./kube-controller-manager
--cluster-cidr 172.7.0.0/16
--leader-elect true
--log-dir /data/logs/kubernetes/kube-controller-manager
--master http://127.0.0.1:8080
--service-account-private-key-file ./certs/ca-key.pem
--service-cluster-ip-range 192.168.0.0/16
--root-ca-file ./certs/ca.pem
--v 2
##调整文件权限，创建目录
[root@kjdow7-21 ~]# cd /opt/kubernetes/server/bin
[root@kjdow7-21 ~]# chmod +x /opt/kubernetes/server/bin/kube-controller-manager.sh
[root@kjdow7-21 ~]# mkdir -p /data/logs/kubernetes/kube-controller-manager
8.2 创建supervisor配置并启动
[root@kjdow7-21 ~]# vim /etc/supervisord.d/kube-conntroller-manager.ini
[program:kube-controller-manager-7-21]
command=/opt/kubernetes/server/bin/kube-controller-manager.sh ; the program (relative uses PATH, can take args)
numprocs=1 ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin ; directory to cwd to before exec (def no cwd)
autostart=true ; start at supervisord start (default: true)
autorestart=true ; retstart at unexpected quit (default: true)
startsecs=22 ; number of secs prog must stay running (def. 1)
startretries=3 ; max # of serial start failures (default 3)
exitcodes=0,2 ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT ; signal used to kill process (default TERM)
stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
user=root ; setuid to this UNIX account to run the program
redirect_stderr=false ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-controller-manager/controll.stdout.log ; stdout log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4 ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false ; emit events on stdout writes (default false)
stderr_logfile=/data/logs/kubernetes/kube-controller-manager/controll.stderr.log ; stderr log path, NONE for none; default AUTO
stderr_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stderr_logfile_backups=4 ; # of stderr logfile backups (default 10)
stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stderr_events_enabled=false ; emit events on stderr writes (default false)
stopasgroup=true
##启动服务并检查
[root@kjdow7-21 ~]# supervisorctl update
kube-controller-manager-7-21: added process group
[root@kjdow7-21 ~]# supervisorctl status
etcd-server-7-21 RUNNING pid 9232, uptime 15:34:39
kube-apiserver-7-21 RUNNING pid 10804, uptime 13:59:08
kube-controller-manager-7-21 RUNNING pid 11922, uptime 0:00:27
8.3 安装部署启动检查所有集群规划主机上的kube-controller-manager服务
在另一台上安装部署kube-controller-manager，注意配置文件ip地址要更改，因为kube-controller-manager组件只是跟本机部署的api-server进行通信，因此不用ssl加密，因此不需要签发证书，一般生产建议这样配置。但如果想让kube-controller-manager跟集群所有的其他组件ssl加密，就需要同样签发两套证书，参考api-server签发证书配置。
[root@kjdow7-22 ~]# supervisorctl update
kube-controller-manager-7-22: added process group
[root@kjdow7-22 ~]# supervisorctl status
etcd-server-7-22 RUNNING pid 9282, uptime 15:11:30
kube-apiserver-7-22 RUNNING pid 10895, uptime 12:12:53
kube-controller-manager-7-22 RUNNING pid 11802, uptime 0:00:39
9.安装部署主控节点调度器服务kube-scheduler
在kjdow7-21、kjdow7-22上进行操作
9.1 创建启动脚本
[root@kjdow7-21 ~]# vim /opt/kubernetes/server/bin/kube-scheduler.sh
#!/bin/sh
./kube-scheduler
--leader-elect
--log-dir /data/logs/kubernetes/kube-scheduler
--master http://127.0.0.1:8080
--v 2
###调整文件权限，创建目录
[root@kjdow7-21 ~]# cd /opt/kubernetes/server/bin
[root@kjdow7-21 ~]# chmod +x /opt/kubernetes/server/bin/kube-scheduler.sh
[root@kjdow7-21 ~]# mkdir -p /data/logs/kubernetes/kube-scheduler
9.2 创建supervisor配置
[root@kjdow7-21 ~]# vim /etc/supervisord.d/kube-scheduler.ini
[program:kube-scheduler-7-21]
command=/opt/kubernetes/server/bin/kube-scheduler.sh ; the program (relative uses PATH, can take args)
numprocs=1 ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin ; directory to cwd to before exec (def no cwd)
autostart=true ; start at supervisord start (default: true)
autorestart=true ; retstart at unexpected quit (default: true)
startsecs=22 ; number of secs prog must stay running (def. 1)
startretries=3 ; max # of serial start failures (default 3)
exitcodes=0,2 ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT ; signal used to kill process (default TERM)
stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
user=root ; setuid to this UNIX account to run the program
redirect_stderr=false ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-scheduler/scheduler.stdout.log ; stdout log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4 ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false ; emit events on stdout writes (default false)
stderr_logfile=/data/logs/kubernetes/kube-scheduler/scheduler.stderr.log ; stderr log path, NONE for none; default AUTO
stderr_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stderr_logfile_backups=4 ; # of stderr logfile backups (default 10)
stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stderr_events_enabled=false ; emit events on stderr writes (default false)
stopasgroup=true
###启动服务并检查
[root@kjdow7-21 ~]# supervisorctl update
kube-scheduler-7-21: added process group
[root@kjdow7-21 ~]# supervisorctl status
etcd-server-7-21 RUNNING pid 9232, uptime 15:50:38
kube-apiserver-7-21 RUNNING pid 10804, uptime 14:15:07
kube-controller-manager-7-21 RUNNING pid 11922, uptime 0:16:26
kube-scheduler-7-21 RUNNING pid 11950, uptime 0:00:33
9.3 安装部署启动检查所有集群规划主机上的kube-scheduler服务
在另一台上安装部署kube-scheduler，注意配置文件ip地址要更改，因为kube-scheduler组件只是跟本机部署的api-server进行通信，因此不用ssl加密，因此不需要签发证书，一般生产建议这样配置。但如果想让kube-scheduler跟集群所有的其他组件ssl加密，就需要同样签发两套证书，参考api-server签发证书配置。
[root@kjdow7-22 ~]# supervisorctl update
kube-scheduler-7-22: added process group
[root@kjdow7-22 ~]# supervisorctl status
etcd-server-7-22 RUNNING pid 9282, uptime 15:25:47
kube-apiserver-7-22 RUNNING pid 10895, uptime 12:27:10
kube-controller-manager-7-22 RUNNING pid 11802, uptime 0:14:56
kube-scheduler-7-22 RUNNING pid 11825, uptime 0:00:29
10.检查主控节点状态
[root@kjdow7-22 ~]# ln -s /opt/kubernetes/server/bin/kubectl /usr/bin/kubectl
[root@kjdow7-22 ~]# kubectl get cs #检查集群的健康状态
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health": "true"}
etcd-2 Healthy {"health": "true"}
etcd-1 Healthy {"health": "true"}
11.部署node节点服务-kubelet
在kjdow7-21、kjdow7-22上进行部署
11.1 签发证书
在kjdow7-200上进行操作
[root@kjdow7-200 certs]# vim /opt/certs/kubelet-csr.json
{
"CN": "kubelet-node",
"hosts": [
"127.0.0.1",
"10.4.7.10",
"10.4.7.21",
"10.4.7.22",
"10.4.7.23",
"10.4.7.24",
"10.4.7.25",
"10.4.7.26",
"10.4.7.27",
"10.4.7.28"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "phc-dow",
"OU": "kjdow"
}
]
}
注意：hosts字段把可能部署kubelet的主机ip都写进去，只能写ip地址，不能写网段。后期如果在非hosts列表中ip主机上部署kubelet，需要重新签发证书，并更换证书，并重启服务
###生成kubelet证书和私钥
[root@kjdow7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssljson -bare kubelet
###检查生成的证书、私钥
[root@kjdow7-200 certs]# ls -l|grep kubelet
total 88
-rw-r--r-- 1 root root 415 Jan 22 16:58 kubelet-csr.json
-rw------- 1 root root 1679 Jan 22 17:00 kubelet-key.pem
-rw-r--r-- 1 root root 1086 Jan 22 17:00 kubelet.csr
-rw-r--r-- 1 root root 1456 Jan 22 17:00 kubelet.pem
11.2 拷贝证书至各运算节点
在kjdow7-21、kjdow7-22上进行操作
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/kubelet.pem .
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/kubelet-key.pem .
[root@kjdow7-21 certs]# ls -l /opt/kubernetes/server/bin/certs
total 40
-rw------- 1 root root 1676 Jan 21 16:39 apiserver-key.pem
-rw-r--r-- 1 root root 1599 Jan 21 16:36 apiserver.pem
-rw------- 1 root root 1675 Jan 21 13:55 ca-key.pem
-rw-r--r-- 1 root root 1354 Jan 21 13:50 ca.pem
-rw------- 1 root root 1679 Jan 21 13:53 client-key.pem
-rw-r--r-- 1 root root 1368 Jan 21 13:53 client.pem
-rw------- 1 root root 1679 Jan 22 17:00 kubelet-key.pem
-rw-r--r-- 1 root root 1456 Jan 22 17:00 kubelet.pem
最后两个是需要拷贝过来的，前面几个之前已经拷贝过来了。
11.3 创建配置文件kubelet.kubeconfig
在kjdow7-21上进行操作,生成的文件直接拷贝到其他节点上使用，不需要再次执行以下步骤。
1）set-cluster
注意：在/opt/kubernetes/server/bin/conf目录下
[root@kjdow7-21 conf]# cd /opt/kubernetes/server/conf
[root@kjdow7-21 conf]# kubectl config set-cluster myk8s
--certificate-authority=/opt/kubernetes/server/bin/certs/ca.pem
--embed-certs=true
--server=https://10.4.7.10:7443
--kubeconfig=kubelet.kubeconfig
Cluster "myk8s" set.
2) set-credentials
注意：在/opt/kubernetes/server/conf目录下
[root@kjdow7-21 conf]# kubectl config set-credentials k8s-node --client-certificate=/opt/kubernetes/server/bin/certs/client.pem --client-key=/opt/kubernetes/server/bin/certs/client-key.pem --embed-certs=true --kubeconfig=kubelet.kubeconfig
User "k8s-node" set.
3) set-context
注意：在/opt/kubernetes/server/conf目录下
[root@kjdow7-21 conf]# kubectl config set-context myk8s-context
--cluster=myk8s
--user=k8s-node
--kubeconfig=kubelet.kubeconfig
Context "myk8s-context" created.
4) use-context
注意：在/opt/kubernetes/server/conf目录下
[root@kjdow7-21 conf]# kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig
Switched to context "myk8s-context".
###查看生成的配置文件
[root@kjdow7-21 conf]# ll
total 12
-rw-r--r-- 1 root root 2223 Jan 9 04:29 audit.yaml
-rw------- 1 root root 6279 Jan 10 01:07 kubelet.kubeconfig
5) 使用k8s-node.yaml给用户k8s-node授权
注意：这一步只需要执行一次即可
- 创建资源配置文件
[root@kjdow7-21 conf]# vim /opt/kubernetes/server/bin/conf/k8s-node.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: k8s-node
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:node
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: User
name: k8s-node
- 应用资源配置文件
7-21 conf]# kubectl create -f k8s-node.yaml
clusterrolebinding.rbac.authorization.k8s.io/k8s-node created
根据rbac规格给k8s-node用户授予权限：集群里成为运算节点的权限，此资源已经写入etcd中，不需要在其他节点重复执行了
- 检查
7-21 conf]# kubectl get clusterrolebinding k8s-node
NAME AGE
k8s-node 3m
7-21 conf]# kubectl get clusterrolebinding k8s-node -o yaml #查看创建yaml语句
11.4 准备pause基础镜像
在kjdow7-200上进行操作
[root@kjdow7-200 ~]# docker pull kubernetes/pause
Using default tag: latest
latest: Pulling from kubernetes/pause
4f4fb700ef54: Pull complete
b9c8ec465f6b: Pull complete
Digest: sha256:b31bfb4d0213f254d361e0079deaaebefa4f82ba7aa76ef82e90b4935ad5b105
Status: Downloaded newer image for kubernetes/pause:latest
docker.io/kubernetes/pause:latest
####查看镜像，并推送到镜像仓库中
[root@kjdow7-200 ~]# docker images | grep pause
kubernetes/pause latest f9d5de079539 5 years ago 240kB
[root@kjdow7-200 ~]# docker tag f9d5de079539 harbor.phc-dow.com/public/pause:latest
[root@kjdow7-200 ~]# docker push harbor.phc-dow.com/public/pause:latest
The push refers to repository [harbor.phc-dow.com/public/pause]
5f70bf18a086: Mounted from public/nginx
e16a89738269: Pushed
latest: digest: sha256:b31bfb4d0213f254d361e0079deaaebefa4f82ba7aa76ef82e90b4935ad5b105 size: 938
11.5 创建kubelet启动脚本
在kjdow7-21、kjdow7-22上进行操作
vim /opt/kubernetes/server/bin/kubelet.sh
#!/bin/sh
./kubelet
--anonymous-auth=false
--cgroup-driver systemd
--cluster-dns 192.168.0.2
--cluster-domain cluster.local
--runtime-cgroups=/systemd/system.slice --kubelet-cgroups=/systemd/system.slice
--fail-swap-on="false"
--client-ca-file ./certs/ca.pem
--tls-cert-file ./certs/kubelet.pem
--tls-private-key-file ./certs/kubelet-key.pem
--hostname-override kjdow7-21.host.com
--image-gc-high-threshold 20
--image-gc-low-threshold 10
--kubeconfig ./conf/kubelet.kubeconfig
--log-dir /data/logs/kubernetes/kube-kubelet
--pod-infra-container-image harbor.phc-dow.com/public/pause:latest
--root-dir /data/kubelet
注意：kubelet集群各主机的启动脚本略有不同，部署其他节点时注意修改。
11.6 检查配置，权限，创建日志目录
在kjdow7-21、kjdow7-22上进行操作
7-21 conf]# ls -l|grep kubelet.kubeconfig
-rw------- 1 root root 6471 Jan 22 17:33 kubelet.kubeconfig
7-21 conf]# chmod +x /opt/kubernetes/server/bin/kubelet.sh
7-21 conf]# mkdir -p /data/logs/kubernetes/kube-kubelet /data/kubelet
11.7 创建supervisor配置,并启动
在kjdow7-21、kjdow7-22上进行操作
[root@kjdow7-21 conf]# vim /etc/supervisord.d/kube-kubelet.ini
[program:kube-kubelet-7-21]
command=/opt/kubernetes/server/bin/kubelet.sh ; the program (relative uses PATH, can take args)
numprocs=1 ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin ; directory to cwd to before exec (def no cwd)
autostart=true ; start at supervisord start (default: true)
autorestart=true ; retstart at unexpected quit (default: true)
startsecs=22 ; number of secs prog must stay running (def. 1)
startretries=3 ; max # of serial start failures (default 3)
exitcodes=0,2 ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT ; signal used to kill process (default TERM)
stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
user=root ; setuid to this UNIX account to run the program
redirect_stderr=false ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-kubelet/kubelet.stdout.log ; stdout log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4 ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false ; emit events on stdout writes (default false)
stderr_logfile=/data/logs/kubernetes/kube-kubelet/kubelet.stderr.log ; stderr log path, NONE for none; default AUTO
stderr_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stderr_logfile_backups=4 ; # of stderr logfile backups (default 10)
stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stderr_events_enabled=false ; emit events on stderr writes (default false)
stopasgroup=true
###启动服务并检查
[root@kjdow7-21 conf]# supervisorctl update
kube-kubelet-7-21: added process group
[root@kjdow7-21 conf]# supervisorctl status
etcd-server-7-21 RUNNING pid 9232, uptime 22:17:49
kube-apiserver-7-21 RUNNING pid 10804, uptime 20:42:18
kube-controller-manager-7-21 RUNNING pid 12138, uptime 5:05:06
kube-kubelet-7-21 RUNNING pid 12683, uptime 0:00:40
kube-scheduler-7-21 RUNNING pid 12131, uptime 5:05:06
###检查运算节点
[root@kjdow7-21 conf]# kubectl get node
NAME STATUS ROLES AGE VERSION
kjdow7-21.host.com Ready <none> 55s v1.15.5
#非常重要！
11.8 安装部署启动检查所有集群规划主机上的kubelet服务
在集群其他节点上部署，重复以上步骤，11.3略有不同，不需要重复做，只需要把文件拷贝到相应位置即可。
[root@kjdow7-22 ~]# supervisorctl update
kube-kubelet-7-22: added process group
[root@kjdow7-22 ~]# supervisorctl status
etcd-server-7-22 RUNNING pid 9282, uptime 22:00:28
kube-apiserver-7-22 RUNNING pid 10895, uptime 19:01:51
kube-controller-manager-7-22 RUNNING pid 11802, uptime 6:49:37
kube-kubelet-7-22 RUNNING pid 12417, uptime 0:00:29
kube-scheduler-7-22 RUNNING pid 11825, uptime 6:35:10
11.9 检查集群状态
###查看节点状态
[root@kjdow7-22 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
kjdow7-21.host.com Ready <none> 12m v1.15.5
kjdow7-22.host.com Ready <none> 2m3s v1.15.5
###给节点创建label标签
[root@kjdow7-22 ~]# kubectl label node kjdow7-21.host.com node-role.kubernetes.io/master=
node/kjdow7-21.host.com labeled
[root@kjdow7-22 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
kjdow7-21.host.com Ready master 13m v1.15.5
kjdow7-22.host.com Ready <none> 3m3s v1.15.5
[root@kjdow7-22 ~]# kubectl label node kjdow7-21.host.com node-role.kubernetes.io/node=
node/kjdow7-21.host.com labeled
[root@kjdow7-22 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
kjdow7-21.host.com Ready master,node 13m v1.15.5
kjdow7-22.host.com Ready <none> 3m32s v1.15.5
[root@kjdow7-22 ~]# kubectl label node kjdow7-22.host.com node-role.kubernetes.io/master=
node/kjdow7-22.host.com labeled
[root@kjdow7-22 ~]# kubectl label node kjdow7-22.host.com node-role.kubernetes.io/node=
node/kjdow7-22.host.com labeled
[root@kjdow7-22 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
kjdow7-21.host.com Ready master,node 13m v1.15.5
kjdow7-22.host.com Ready master,node 3m51s v1.15.5
12、安装部署运算节点服务--kube-proxy
在kjdow7-21、kjdow7-22上进行部署
12.1 签发kube-proxy证书
在kjdow7-200上进行操作
vim /opt/certs/kube-proxy-csr.json
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "phc-dow",
"OU": "kjdow"
}
]
}
##生成kube-proxy证书和私钥
7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client kube-proxy-csr.json | cfssljson -bare kube-proxy-client
##检查生成的证书、私钥
7-200 certs]# ls -l|grep kube-proxy
-rw------- 1 root root 1679 Jan 22 17:31 kube-proxy-client-key.pem
-rw-r--r-- 1 root root 1005 Jan 22 17:31 kube-proxy-client.csr
-rw-r--r-- 1 root root 1383 Jan 22 17:31 kube-proxy-client.pem
-rw-r--r-- 1 root root 268 Jan 22 17:23 kube-proxy-csr.json
12.2 拷贝证书至各运算节点
在kjdow7-21、kjdow7-22上进行操作
[root@kjdow7-21 ~]# cd /opt/kubernetes/server/bin/certs/
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/kube-proxy-client.pem .
[root@kjdow7-21 certs]# scp kjdow7-200:/opt/certs/kube-proxy-client-key.pem .
7-21 cert]# ls -l /opt/kubernetes/server/bin/certs
total 40
-rw------- 1 root root 1676 Jan 21 16:39 apiserver-key.pem
-rw-r--r-- 1 root root 1599 Jan 21 16:36 apiserver.pem
-rw------- 1 root root 1675 Jan 21 13:55 ca-key.pem
-rw-r--r-- 1 root root 1354 Jan 21 13:50 ca.pem
-rw------- 1 root root 1679 Jan 21 13:53 client-key.pem
-rw-r--r-- 1 root root 1368 Jan 21 13:53 client.pem
-rw------- 1 root root 1679 Jan 22 17:00 kubelet-key.pem
-rw-r--r-- 1 root root 1456 Jan 22 17:00 kubelet.pem
-rw------- 1 root root 1679 Jan 22 17:31 kube-proxy-client-key.pem
-rw-r--r-- 1 root root 1383 Jan 22 17:31 kube-proxy-client.pem
注意： 只需要拷贝最后两个即可
12.3 创建配置kube-proxy.kubeconfig
注意：这一步生成的文件只需要做一次，然后把生成的文件拷贝到其他节点
1) set-cluster
注意：在conf目录下
7-21 conf]# cd /opt/kubernetes/server/bin/conf
7-21 conf]# kubectl config set-cluster myk8s
--certificate-authority=/opt/kubernetes/server/bin/certs/ca.pem
--embed-certs=true
--server=https://10.4.7.10:7443
--kubeconfig=kube-proxy.kubeconfig
Cluster "myk8s" set.
2) set-credentials
注意：在conf目录下
7-21 conf]# kubectl config set-credentials kube-proxy
--client-certificate=/opt/kubernetes/server/bin/certs/kube-proxy-client.pem
--client-key=/opt/kubernetes/server/bin/certs/kube-proxy-client-key.pem
--embed-certs=true
--kubeconfig=kube-proxy.kubeconfig
User "kube-proxy" set.
3) set-context
注意：在conf目录下
7-21 conf]# kubectl config set-context myk8s-context
--cluster=myk8s
--user=kube-proxy
--kubeconfig=kube-proxy.kubeconfig
Context "myk8s-context" created.
4) use-context
注意：在conf目录下
7-21 conf]# kubectl config use-context myk8s-context --kubeconfig=kube-proxy.kubeconfig
Switched to context "myk8s-context".
##查看创建的文件
7-21 conf]# ls -l|grep kube-proxy.kubeconfig
-rw------- 1 root root 6471 Jan 22 17:33 kube-proxy.kubeconfig
12.4 加载ipvs模块
在kjdow7-21、kjdow7-22上进行操作
vim /root/ipvs.sh
#!/bin/bash
ipvs_mods_dir="/usr/lib/modules/$(uname -r)/kernel/net/netfilter/ipvs"
for i in $(ls $ipvs_mods_dir|grep -o "^[^.]*")
do
/sbin/modinfo -F filename $i &>/dev/null
if [ $? -eq 0 ];then
/sbin/modprobe $i
fi
done
脚本主要是加载有关ipvs模块
[root@kjdow7-21 ~]# lsmod | grep ip_vs
[root@kjdow7-21 ~]# chmod +x /root/ipvs.sh
[root@kjdow7-21 ~]# sh /root/ipvs.sh
[root@kjdow7-21 ~]# lsmod | grep ip_vs
ip_vs_wrr 12697 0
ip_vs_wlc 12519 0
ip_vs_sh 12688 0
ip_vs_sed 12519 0
ip_vs_rr 12600 0
ip_vs_pe_sip 12740 0
nf_conntrack_sip 33860 1 ip_vs_pe_sip
ip_vs_nq 12516 0
ip_vs_lc 12516 0
ip_vs_lblcr 12922 0
ip_vs_lblc 12819 0
ip_vs_ftp 13079 0
ip_vs_dh 12688 0
ip_vs 145497 24 ip_vs_dh,ip_vs_lc,ip_vs_nq,ip_vs_rr,ip_vs_sh,ip_vs_ftp,ip_vs_sed,ip_vs_wlc,ip_vs_wrr,ip_vs_pe_sip,ip_vs_lblcr,ip_vs_lblc
nf_nat 26787 3 ip_vs_ftp,nf_nat_ipv4,nf_nat_masquerade_ipv4
nf_conntrack 133095 8 ip_vs,nf_nat,nf_nat_ipv4,xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_netlink,nf_conntrack_sip,nf_conntrack_ipv4
libcrc32c 12644 4 xfs,ip_vs,nf_nat,nf_conntrack
12.5 创建kube-proxy启动脚本
在kjdow7-21、kjdow7-22上进行操作
[root@kjdow7-21 ~]# vim /opt/kubernetes/server/bin/kube-proxy.sh
#!/bin/sh
./kube-proxy
--cluster-cidr 172.7.0.0/16
--hostname-override kjdow7-21.host.com
--proxy-mode=ipvs
--ipvs-scheduler=nq
--kubeconfig ./conf/kube-proxy.kubeconfig
##检查配置，权限，创建日志目录
7-21 conf]# chmod +x /opt/kubernetes/server/bin/kube-proxy.sh
7-21 conf]# mkdir -p /data/logs/kubernetes/kube-proxy
注意：kube-proxy集群各主机的启动脚本略有不同，部署其他节点时注意修改。
12.6 创建supervisor配置,并启动服务
在kjdow7-21、kjdow7-22上进行操作
[root@kjdow7-21 ~]# vim /etc/supervisord.d/kube-proxy.ini
[program:kube-proxy-7-21]
command=/opt/kubernetes/server/bin/kube-proxy.sh ; the program (relative uses PATH, can take args)
numprocs=1 ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin ; directory to cwd to before exec (def no cwd)
autostart=true ; start at supervisord start (default: true)
autorestart=true ; retstart at unexpected quit (default: true)
startsecs=22 ; number of secs prog must stay running (def. 1)
startretries=3 ; max # of serial start failures (default 3)
exitcodes=0,2 ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT ; signal used to kill process (default TERM)
stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10)
user=root ; setuid to this UNIX account to run the program
redirect_stderr=false ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-proxy/proxy.stdout.log ; stdout log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4 ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false ; emit events on stdout writes (default false)
stderr_logfile=/data/logs/kubernetes/kube-proxy/proxy.stderr.log ; stderr log path, NONE for none; default AUTO
stderr_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB)
stderr_logfile_backups=4 ; # of stderr logfile backups (default 10)
stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0)
stderr_events_enabled=false ; emit events on stderr writes (default false)
stopasgroup=true
##启动服务并检查
[root@kjdow7-21 ~]# supervisorctl update
kube-proxy-7-21: added process group
[root@kjdow7-21 ~]# supervisorctl status
etcd-server-7-21 RUNNING pid 9232, uptime 1 day, 21:43:47
kube-apiserver-7-21 RUNNING pid 10804, uptime 1 day, 20:08:16
kube-controller-manager-7-21 RUNNING pid 12138, uptime 1 day, 4:31:04
kube-kubelet-7-21 RUNNING pid 12683, uptime 23:26:38
kube-proxy-7-21 RUNNING pid 30246, uptime 0:00:58
kube-scheduler-7-21 RUNNING pid 12131, uptime 1 day, 4:31:04
12.7 安装部署启动检查所有集群规划主机上的kube-proxy服务
[root@kjdow7-22 ~]# supervisorctl update
kube-proxy-7-22: added process group
[root@kjdow7-22 ~]# supervisorctl status
etcd-server-7-22 RUNNING pid 9282, uptime 1 day, 21:18:32
kube-apiserver-7-22 RUNNING pid 10895, uptime 1 day, 18:19:55
kube-controller-manager-7-22 RUNNING pid 11802, uptime 1 day, 6:07:41
kube-kubelet-7-22 RUNNING pid 12417, uptime 23:18:33
kube-proxy-7-22 RUNNING pid 28635, uptime 0:01:08
kube-scheduler-7-22 RUNNING pid 11825, uptime 1 day, 5:53:14
12.8 验证ipvs功能
[root@kjdow7-21 ~]# yum install ipvsadm -y
[root@kjdow7-21 ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.0.1:443 nq
-> 10.4.7.21:6443 Masq 1 0 0
-> 10.4.7.22:6443 Masq 1 0 0
[root@kjdow7-21 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 192.168.0.1 <none> 443/TCP 2d
13、 验证kubernetes集群
在任意一个运算节点，创建一个资源配置清单
[root@kjdow7-21 ~]# vim /root/nginx-ds.yaml
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
name: nginx-ds
spec:
template:
metadata:
labels:
app: nginx-ds
spec:
containers:
- name: my-nginx
image: harbor.phc-dow.com/public/nginx:v1.7.9
ports:
- containerPort: 80
[root@kjdow7-21 ~]# kubectl create -f nginx-ds.yaml
daemonset.extensions/nginx-ds created
[root@kjdow7-21 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-ds-ssdtm 1/1 Running 0 56s
nginx-ds-xfsk4 1/1 Running 0 56s
[root@kjdow7-21 ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-ds-ssdtm 1/1 Running 0 106s 172.7.21.2 kjdow7-21.host.com <none> <none>
nginx-ds-xfsk4 1/1 Running 0 106s 172.7.22.2 kjdow7-22.host.com <none> <none>
可以看到已经起了两个pod，使用curl命令只能通一个，是因为跨宿主机之间还不能通信。