https://www.cnblogs.com/cocowool/p/install_k8s_offline.html
https://www.jianshu.com/p/073577bdec98
https://blog.csdn.net/crabdave/article/details/84880771
本文环境 Redhat Linux 7.3，操作系统采用的最小安装方式。
Kubernetes的版本为 V1.10。
Docker版本为18.03.1-ce。
etcd 版本为 V3.3.8。
1. 准备规划
1.1 Node 规划
主机名 | 地址 | 角色 |
devops-101 | 192.168.0.101 | k8s master |
devops-102 | 192.168.0.102 | k8s node |
1.2 Network 网络
1.3 安装文件
Kubernetes安装需要以下二进制文件：
- etcd
- docker
- Kubernetes
- kubelet
- kube-proxy
- kube-apiserver
- kube-controller-manager
- kube-scheduler
我们可以下载编译好的二进制文件，也可以下载源码自己编译，源码编译可以参考这里本文只讨论二进制的安装方式。在Kubernetes的Github Latest 页面，可以看到最新打包的版本。也可以到 Tag 页面中找到自己需要的版本，我下载的是 V1.11。
注意这个页面有可能不是最新的版本，我查看的时候显示的版本是 V1.9.9，但是最新的版本是 V1.11，这时就需要切换到 Tag 页面查找。
服务器上需要的二进制文件并不在下载的 tar 包中，需要解压tar包，然后执行cluster/get-kube-binaries.sh。下载需要访问 storage.googleapis.com，因为大家都知道的原因，可能无法正常访问，需要大家科学的获取安装文件。下载完成后，解压kubernetes-server-linux-amd64.tar.gz。
可以看到文件列表
[root@devops-101 bin]# pwd
/root/kubernetes/server/bin
[root@devops-101 bin]# ls -lh
total 1.8G
-rwxr-xr-x. 1 root root 57M Jun 28 04:55 apiextensions-apiserver
-rwxr-xr-x. 1 root root 132M Jun 28 04:55 cloud-controller-manager
-rw-r--r--. 1 root root 8 Jun 28 04:55 cloud-controller-manager.docker_tag
-rw-r--r--. 1 root root 134M Jun 28 04:55 cloud-controller-manager.tar
-rwxr-xr-x. 1 root root 218M Jun 28 04:55 hyperkube
-rwxr-xr-x. 1 root root 56M Jun 28 04:55 kube-aggregator
-rw-r--r--. 1 root root 8 Jun 28 04:55 kube-aggregator.docker_tag
-rw-r--r--. 1 root root 57M Jun 28 04:55 kube-aggregator.tar
-rwxr-xr-x. 1 root root 177M Jun 28 04:55 kube-apiserver
-rw-r--r--. 1 root root 8 Jun 28 04:55 kube-apiserver.docker_tag
-rw-r--r--. 1 root root 179M Jun 28 04:55 kube-apiserver.tar
-rwxr-xr-x. 1 root root 147M Jun 28 04:55 kube-controller-manager
-rw-r--r--. 1 root root 8 Jun 28 04:55 kube-controller-manager.docker_tag
-rw-r--r--. 1 root root 149M Jun 28 04:55 kube-controller-manager.tar
-rwxr-xr-x. 1 root root 50M Jun 28 04:55 kube-proxy
-rw-r--r--. 1 root root 8 Jun 28 04:55 kube-proxy.docker_tag
-rw-r--r--. 1 root root 96M Jun 28 04:55 kube-proxy.tar
-rwxr-xr-x. 1 root root 54M Jun 28 04:55 kube-scheduler
-rw-r--r--. 1 root root 8 Jun 28 04:55 kube-scheduler.docker_tag
-rw-r--r--. 1 root root 55M Jun 28 04:55 kube-scheduler.tar
-rwxr-xr-x. 1 root root 55M Jun 28 04:55 kubeadm
-rwxr-xr-x. 1 root root 53M Jun 28 04:56 kubectl
-rwxr-xr-x. 1 root root 156M Jun 28 04:55 kubelet
-rwxr-xr-x. 1 root root 2.3M Jun 28 04:55 mounter
1.4 系统配置
- 配置Hosts
- 关闭防火墙
$ systemctl stop firewalld
$ systemctl disable firewalld
- 关闭selinux
$ vim /etc/selinux/config
将SELINUX=enforcing改为SELINUX=disabled，wq保存退出。
- 关闭swap
$ swapoff -a
$ vim /etc/fstab #修改自动挂载配置，注释掉即可
#/dev/mapper/centos-swap swap swap defaults 0 0
2. 安装 Node
我们需要在Node机器上安装以下应用：
- Docker
- kubelet
- kube-proxy
2.1 Docker
Docker的版本需要与kubelete版本相对应，最好都使用最新的版本。Redhat 中需要使用 Static Binary 方式安装，具体可以参考我之前的一篇文章。
2.2 拷贝 kubelet、kube-proxy
在之前解压的 kubernetes 文件夹中拷贝二进制文件
$ cp /root/kubernetes/server/bin/kubelet /usr/bin/
$ cp /root/kubernetes/server/bin/kube-proxy /usr/bin/
2.3 安装 kube-proxy 服务
$ vim /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
EnvironmentFile=/etc/kubernetes/config
EnvironmentFile=/etc/kubernetes/proxy
ExecStart=/usr/bin/kube-proxy
$KUBE_LOGTOSTDERR
$KUBE_LOG_LEVEL
$KUBE_MASTER
$KUBE_PROXY_ARGS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
创建配置目录，并添加配置文件
$ mkdir -p /etc/kubernetes
$ vim /etc/kubernetes/proxy
KUBE_PROXY_ARGS=""
$ vim /etc/kubernetes/config
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow_privileged=false"
KUBE_MASTER="--master=http://192.168.0.101:8080"
启动服务
[root@devops-102 ~]# systemctl daemon-reload
[root@devops-102 ~]# systemctl start kube-proxy.service
[root@devops-102 ~]# netstat -lntp | grep kube-proxy
tcp 0 0 127.0.0.1:10249 0.0.0.0:* LISTEN 10522/kube-proxy
tcp6 0 0 :::10256 :::* LISTEN 10522/kube-proxy
2.4 安装 kubelete 服务
$ vim /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service
[Service]
WorkingDirectory=/var/lib/kubelet
EnvironmentFile=/etc/kubernetes/kubelet
ExecStart=/usr/bin/kubelet $KUBELET_ARGS
Restart=on-failure
KillMode=process
[Install]
WantedBy=multi-user.target
$ mkdir -p /var/lib/kubelet
$ vim /etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_HOSTNAME="--hostname-override=192.168.0.102"
KUBELET_API_SERVER="--api-servers=http://192.168.0.101:8080"
KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=reg.docker.tb/harbor/pod-infrastructure:latest"
KUBELET_ARGS="--enable-server=true --enable-debugging-handlers=true --fail-swap-on=false --kubeconfig=/var/lib/kubelet/kubeconfig"
创建配置文件 vim /var/lib/kubelet/kubeconfig
apiVersion: v1
kind: Config
users:
- name: kubelet
clusters:
- name: kubernetes
cluster:
server: http://192.168.0.101:8080
contexts:
- context:
cluster: kubernetes
user: kubelet
name: service-account-context
current-context: service-account-context
启动kubelet并进习验证。
$ swapoff -a
$ systemctl daemon-reload
$ systemctl start kubelet.service
$ netstat -tnlp | grep kubelet
tcp 0 0 127.0.0.1:10248 0.0.0.0:* LISTEN 10630/kubelet
tcp 0 0 127.0.0.1:37865 0.0.0.0:* LISTEN 10630/kubelet
tcp6 0 0 :::10250 :::* LISTEN 10630/kubelet
tcp6 0 0 :::10255 :::* LISTEN 10630/kubelet
3. 安装 Master
3.1 安装etcd
本文采用二进制安装方法，首先下载安装包。
之后进行解压，文件拷贝，编辑 etcd.service、etcd.conf文件夹
$ tar zxf etcd-v3.2.11-linux-amd64.tar.gz
$ cd etcd-v3.2.11-linux-amd64
$ cp etcd etcdctl /usr/bin/
$ vim /usr/lib/systemd/system/etcd.service
[Unit]
Description=etcd.service
[Service]
Type=notify
TimeoutStartSec=0
Restart=always
WorkingDirectory=/var/lib/etcd
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/bin/etcd
[Install]
WantedBy=multi-user.target
$ mkdir -p /var/lib/etcd && mkdir -p /etc/etcd/
$ vim /etc/etcd/etcd.conf
ETCD_NAME=ETCD Server
ETCD_DATA_DIR="/var/lib/etcd/"
ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.0.101:2379"
# 启动etcd
$ systemctl daemon-reload
$ systemctl start etcd.service
查看etcd状态是否正常
$ etcdctl cluster-health
member 8e9e05c52164694d is healthy: got healthy result from http://192.168.0.101:2379
cluster is healthy
3.2 安装kube-apiserver
添加启动文件
[Unit]
Description=Kubernetes API Server
After=etcd.service
Wants=etcd.service
[Service]
EnvironmentFile=/etc/kubernetes/apiserver
ExecStart=/usr/bin/kube-apiserver
$KUBE_ETCD_SERVERS
$KUBE_API_ADDRESS
$KUBE_API_PORT
$KUBE_SERVICE_ADDRESSES
$KUBE_ADMISSION_CONTROL
$KUBE_API_LOG
$KUBE_API_ARGS
Restart=on-failure
Type=notify
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
创建配置文件
$ vim /etc/kubernetes/apiserver
KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
KUBE_API_PORT="--port=8080"
KUBELET_PORT="--kubelet-port=10250"
KUBE_ETCD_SERVERS="--etcd-servers=http://192.168.0.101:2379"
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.0.0.0/24"
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"
KUBE_API_ARGS=""
启动服务
$ systemctl daemon-reload
$ systemctl start kube-apiserver.service
查看启动是否成功
$ netstat -tnlp | grep kube
tcp6 0 0 :::6443 :::* LISTEN 10144/kube-apiserve
tcp6 0 0 :::8080 :::* LISTEN 10144/kube-apiserve
3.3 安装kube-controller-manager
创建启动文件
$ vim /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Scheduler
After=kube-apiserver.service
Requires=kube-apiserver.service
[Service]
EnvironmentFile=-/etc/kubernetes/controller-manager
ExecStart=/usr/bin/kube-controller-manager
$KUBE_MASTER
$KUBE_CONTROLLER_MANAGER_ARGS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
创建配置文件
$ vim /etc/kubernetes/controller-manager
KUBE_MASTER="--master=http://192.168.0.101:8080"
KUBE_CONTROLLER_MANAGER_ARGS=" "
启动服务
$ systemctl daemon-reload
$ systemctl start kube-controller-manager.service
验证服务状态
$ netstat -lntp | grep kube-controll
tcp6 0 0 :::10252 :::* LISTEN 10163/kube-controll
3.4 安装kube-scheduler
创建启动文件
$ vim /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
After=kube-apiserver.service
Requires=kube-apiserver.service
[Service]
User=root
EnvironmentFile=/etc/kubernetes/scheduler
ExecStart=/usr/bin/kube-scheduler
$KUBE_MASTER
$KUBE_SCHEDULER_ARGS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
修改配置
$ vim /etc/kubernetes/scheduler
KUBE_MASTER="--master=http://192.168.0.101:8080"
KUBE_SCHEDULER_ARGS="--logtostderr=true --log-dir=/home/log/kubernetes --v=2"
启动服务
$ systemctl daemon-reload
$ systemctl start kube-scheduler.service
验证服务状态
$ netstat -lntp | grep kube-schedule
tcp6 0 0 :::10251 :::* LISTEN 10179/kube-schedule
3.5 配置Profile
$ sed -i '$a export PATH=$PATH:/root/kubernetes/server/bin/' /etc/profile
$ source /etc/profile
3.6 安装 kubectl 并查看状态
$ cp /root/kubernetes/server/bin/kubectl /usr/bin/
$ kubectl get cs
NAME STATUS MESSAGE ERROR
etcd-0 Healthy {"health":"true"}
controller-manager Healthy ok
scheduler Healthy ok
到这里Master节点就配置完毕。
4. 配置flannel网络
Flannel可以使整个集群的docker容器拥有唯一的内网IP，并且多个node之间的docker0可以互相访问。下载地址
5. 集群验证
在101上执行命令，检查nodes，如果能看到，表明集群现在已经OK了。
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
devops-102 Ready <none> 12s v1.11.0
6.将二进制的docker包加入到systemctl启动中
首先将解压后的docker目录下的所有文件复制到/usr/bin目录下，然后service文件
将二进制的docker包加入到systemctl启动中
创建service文件加入以下内容
vi /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s