环境规划
k8s-master1 192.168.248.161 kube-apiserver kube-controller-manager kube-scheduler k8s-master2 192.168.248.162 kube-apiserver kube-controller-manager kube-scheduler k8s-node01 192.168.248.162 kubelet kube-proxy docker LB(Master) 192.168.248.202 Nginx Keepalived LB(Backup) 192.168.248.206 Nginx Keepalived nfs-server etcd01 192.168.248.202 etcd etcd02 192.168.248.220 etcd etcd03 192.168.248.224 etcd VIP：192.168.248.209
备注：因为服务器资源问题，只部署了2个master节点1个node节点，并且192.168.248.162这台机器即充当master节点又充当唯一的node节点，192.168.248.202这台机器即充当LB又充当etcd01,etcd集群的安装部署参考https://www.cnblogs.com/zhangmingcheng/p/13625664.html，LB的集群的安装部署参考https://www.cnblogs.com/zhangmingcheng/p/13646907.html。
系统初始化（master节点与node节点需要执行）：
#系统更新
yum update -y
#安装ipvs相关模块
yum install -y epel-release conntrack ipvsadm ipset jq sysstat curl iptables libseccomp
#关闭防火墙：
systemctl stop firewalld
systemctl disable firewalld
#关闭selinux：
setenforce 0 # 临时
sed -i 's/enforcing/disabled/' /etc/selinux/config # 永久
关闭swap：
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab
cat /etc/fstab
#同步系统时间：
ntpdate time.windows.com
#添加hosts(可忽略)：
vim /etc/hosts
192.168.248.161 k8s-master1
192.168.248.162 k8s-master2
192.168.248.162 k8s-node01
#修改主机名(可忽略)：
hostnamectl set-hostname NAME
#设置内核 将桥接的IPv4流量传递到iptables的链
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
modprobe br_netfilter
sysctl -p /etc/sysctl.d/k8s.conf
#准备部署目录
mkdir -p /opt/etcd/{cfg,ssl,bin}
mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
echo 'export PATH=/opt/kubernetes/bin:$PATH' > /etc/profile.d/k8s.sh
echo 'export PATH=/opt/etcd/bin:$PATH' > /etc/profile.d/etcd.sh
source /etc/profile
部署k8s集群
生成各组件所需证书
#创建CA配置文件
cd tls/k8s/
cat << EOF | tee ca-config.json
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"expiry": "87600h",
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
]
}
}
}
}
EOF
#创建CA签名请求
cat << EOF | tee ca-csr.json
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "Beijing",
"ST": "Beijing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
#创建kubernetes证书所需文件
cat << EOF | tee server-csr.json
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local",
"10.0.0.1",
"192.168.248.161",
"192.168.248.162",
"192.168.248.209",
"192.168.248.202",
"192.168.248.206"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
#注：上述文件hosts字段中IP为所有Master/LB/VIP IP，一个都不能少！为了方便后期扩容可以多写几个预留的IP。
#创建kube-proxy证书所需文件
cat << EOF | tee kube-proxy-csr.json
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}
EOF
#创建admin证书签名请求
cat << EOF | tee admin-csr.json
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "system:masters",
"OU": "System"
}
]
}
EOF
#生成证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
#分发证书
scp *.pem k8s-masterIP:/opt/kubernetes/ssl/
scp kube-proxy*.pem ca.pem k8s-nodeIP:/opt/kubernetes/ssl/
准备二进制文件
cd /opt wget https://dl.k8s.io/v1.18.6/kubernetes-server-linux-amd64.tar.gz tar xf kubernetes-server-linux-amd64.tar.gz cd kubernetes/server/bin/ scp kube-apiserver kube-scheduler kube-controller-manager kubelet kube-proxy kubectl k8s-masterIP:/opt/kubernetes/bin/ scp kubelet kube-proxy k8s-nodeIP:/opt/kubernetes/bin/
部署k8s-master1
#创建kube-apiserver配置文件
vim /opt/kubernetes/cfg/kube-apiserver.conf
KUBE_APISERVER_OPTS="--logtostderr=false
--v=2
--log-dir=/opt/kubernetes/logs
--etcd-servers=https://192.168.248.202:2379,https://192.168.248.220:2379,https://192.168.248.224:2379
--bind-address=192.168.248.161
--secure-port=6443
--advertise-address=192.168.248.161
--allow-privileged=true
--service-cluster-ip-range=10.0.0.0/24
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction,DefaultStorageClass
--authorization-mode=RBAC,Node
--enable-bootstrap-token-auth=true
--token-auth-file=/opt/kubernetes/cfg/token.csv
--service-node-port-range=30000-32767
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem
--tls-cert-file=/opt/kubernetes/ssl/server.pem
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem
--client-ca-file=/opt/kubernetes/ssl/ca.pem
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem
--etcd-cafile=/opt/etcd/ssl/ca.pem
--etcd-certfile=/opt/etcd/ssl/server.pem
--etcd-keyfile=/opt/etcd/ssl/server-key.pem
--audit-log-maxage=30
--audit-log-maxbackup=3
--audit-log-maxsize=100
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
#创建kube-apiserver系统服务
vim /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.conf
ExecStart=/opt/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
#创建controller-manager配置文件
vim /opt/kubernetes/cfg/kube-controller-manager.conf
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false
--v=2
--log-dir=/opt/kubernetes/logs
--leader-elect=true
--master=127.0.0.1:8080
--address=127.0.0.1
--allocate-node-cidrs=true
--cluster-cidr=10.244.0.0/16
--service-cluster-ip-range=10.0.0.0/24
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem
--root-ca-file=/opt/kubernetes/ssl/ca.pem
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem
--experimental-cluster-signing-duration=87600h0m0s"
#创建controller-manager系统服务
vim /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf
ExecStart=/opt/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
#创建scheduler配置文件
vim /opt/kubernetes/cfg/kube-scheduler.conf
KUBE_SCHEDULER_OPTS="--logtostderr=false
--v=2
--log-dir=/opt/kubernetes/logs
--leader-elect
--master=127.0.0.1:8080
--address=127.0.0.1"
#创建scheduler系统服务
vim /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
启用TLS Bootstrapping
export BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')
cat > /opt/kubernetes/cfg/token.csv <<EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF
cat /opt/kubernetes/cfg/token.csv
d5ff43e323ee5ffedec6fd630e37daaf,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
#启动master组件
systemctl daemon-reload
systemctl enable kube-apiserver kube-controller-manager kube-scheduler
systemctl restart kube-apiserver kube-controller-manager kube-scheduler
systemctl status kube-apiserver kube-controller-manager kube-scheduler
注意：需要将etcd服务器上的ssl证书目录上传到k8s-master1:/opt/etcd目录
部署k8s-master2
#拷贝master1组件配置文件
scp -r /opt/kubernetes 192.168.0.132:/opt/
scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service 192.168.0.132:/usr/lib/systemd/system
#需要修改master2的apiserver配置文件为本地IP，启动服务即可
注意：需要将etcd服务器上的ssl证书目录上传到k8s-master2:/opt/etcd目录
查看集群信息
kubectl get cs
给kubelet-bootstrap授权用户允许请求证书(master节点执行)
kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
部署node节点
生成bootstrap.kubeconfig文件
KUBE_APISERVER="https://192.168.248.209:6443" # apiserver IP:PORT
TOKEN="d5ff43e323ee5ffedec6fd630e37daaf" # 与token.csv里保持一致
# 生成 kubelet bootstrap kubeconfig 配置文件
kubectl config set-cluster kubernetes
--certificate-authority=/opt/kubernetes/ssl/ca.pem
--embed-certs=true
--server=${KUBE_APISERVER}
--kubeconfig=bootstrap.kubeconfig
#设置客户端认证参数
kubectl config set-credentials "kubelet-bootstrap"
--token=${TOKEN}
--kubeconfig=bootstrap.kubeconfig
#设置上下文参数
kubectl config set-context default
--cluster=kubernetes
--user="kubelet-bootstrap"
--kubeconfig=bootstrap.kubeconfig
#设置默认上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
拷贝到配置文件路径：
cp bootstrap.kubeconfig /opt/kubernetes/cfg
matser节点批准kubelet证书申请并加入集群
# 查看kubelet证书请求 kubectl get csr NAME AGE SIGNERNAME REQUESTOR CONDITION node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A 6m3s kubernetes.io/kube-apiserver-client-kubelet kubelet-bootstrap Pending # 批准申请 kubectl certificate approve node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A
安装docker（此步骤忽略）
部署kubelet和kube-proxy
#创建 kubelet bootstrapping kubeconfig 文件
vim /opt/kubernetes/cfg/bootstrap.kubeconfig
apiVersion: v1
clusters:
- cluster:
certificate-authority: /opt/kubernetes/ssl/ca.pem
server: https://192.168.248.209:6443
name: kubernetes
contexts:
- context:
cluster: kubernetes
user: kubelet-bootstrap
name: default
current-context: default
kind: Config
preferences: {}
users:
- name: kubelet-bootstrap
user:
token: d5ff43e323ee5ffedec6fd630e37daaf
#创建kubelet配置文件
vim /opt/kubernetes/cfg/kubelet.conf
KUBELET_OPTS="--logtostderr=false
--v=2
--log-dir=/opt/kubernetes/logs
--hostname-override=192.168.248.162 ###各node节点hostname
--network-plugin=cni
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig
--config=/opt/kubernetes/cfg/kubelet-config.yml
--cert-dir=/opt/kubernetes/ssl
--pod-infra-container-image=lizhenliang/pause-amd64:3.0"
#创建kubelet-config.yml文件
vim /opt/kubernetes/cfg/kubelet-config.yml
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local
failSwapOn: false
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /opt/kubernetes/ssl/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
evictionHard:
imagefs.available: 15%
memory.available: 100Mi
nodefs.available: 10%
nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110
#创建kubelet系统服务
vim /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf
ExecStart=/opt/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
###创建kube-proxy配置文件
vim /opt/kubernetes/cfg/kube-proxy.conf
KUBE_PROXY_OPTS="--logtostderr=false
--v=2
--log-dir=/opt/kubernetes/logs
--config=/opt/kubernetes/cfg/kube-proxy-config.yml"
# vim /opt/kubernetes/cfg/kube-proxy.kubeconfig
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUR2akNDQXFhZ0F3SUJBZ0lVZDZQM04vSmhRNUtJczZ1elA3OXo5UHgzWExjd0RRWUpLb1pJaHZjTkFRRUwKQlFBd1pURUxNQWtHQTFVRUJoTUNRMDR4RURBT0JnTlZCQWdUQjBKbGFXcHBibWN4RURBT0JnTlZCQWNUQjBKbAphV3BwYm1jeEREQUtCZ05WQkFvVEEyczRjekVQTUEwR0ExVUVDeE1HVTNsemRHVnRNUk13RVFZRFZRUURFd3ByCmRXSmxjbTVsZEdWek1CNFhEVEl3TURrd09EQXlNVFl3TUZvWERUSTFNRGt3TnpBeU1UWXdNRm93WlRFTE1Ba0cKQTFVRUJoTUNRMDR4RURBT0JnTlZCQWdUQjBKbGFXcHBibWN4RURBT0JnTlZCQWNUQjBKbGFXcHBibWN4RERBSwpCZ05WQkFvVEEyczRjekVQTUEwR0ExVUVDeE1HVTNsemRHVnRNUk13RVFZRFZRUURFd3ByZFdKbGNtNWxkR1Z6Ck1JSUJJakFOQmdrcWhraUc5dzBCQVFFRkFBT0NBUThBTUlJQkNnS0NBUUVBeHA4akMzekVSbVY4bnovUThycnQKZmVxdExKaFZ2cDdMbGdwWFhYNTBJaDFyOG5xcWNJOElmakVMRG00NGE3Sm5WYTdlRWJubCtSVjJzc2RhRlRPVQpTOXQvWDFJZHhHZHh1UEllSms3VjVwU2FFMjQ3ZDF2NmxHWThFUjNaME5IZnIwOEUzeHNsaG1vUzI5MFN0MHBJCjY4S0VuRFFGQ1VSaG9CMzE4VEtDbDV5K3pJMHQ4M3VoUVEybmV6SkV0WHVZNVVuUVVZMU1mUkhMRzg5SnplYUkKdXlvbSsrdEg5VWFSdmFPVFUzYkpFQldnUHpMakcrTkpaSi9VNHA1ak0vQ1FuTC9UbS8wdWd0c0IvbWlVMTlVNgp5RWtnV2tjOGxYSkM2OWhNYUtNSVVaZFBiQjZOZk80Y0IycmxSSDRiekM0QTY5bFpYR2piYUU0U1BqTXZwaVh1CklRSURBUUFCbzJZd1pEQU9CZ05WSFE4QkFmOEVCQU1DQVFZd0VnWURWUjBUQVFIL0JBZ3dCZ0VCL3dJQkFqQWQKQmdOVkhRNEVGZ1FVZE9aL0lSbU9LT051K1pIcEZNOEVoNFNiellVd0h3WURWUjBqQkJnd0ZvQVVkT1ovSVJtTwpLT051K1pIcEZNOEVoNFNiellVd0RRWUpLb1pJaHZjTkFRRUxCUUFEZ2dFQkFEcDdrR2JlREpGZ2E0RjRGd2p4ClJLVkxsQkYrVFFSOHA5Vno2bTA2eVFTcWpEcXNIUTNVeStMaFZoTWJCQTdBOFhIOEtNVzByMWVQMi9Vd1NsaHYKMlVZdWZEcW5nYWNRRG0xSTE4cjRhRjl6c1UzN29Ycko3V0V6S1QzY2RQZHltWVhjUWN4eGZkQnMxdHpjU1B4TQpVbUVsVG9kQ0lNMjhuRHdoT1kvZ1JSZlFycTVISjhjQ1BaSVhtME9lQ2xKRzdHQVRXWC8xNW9hb2FCakQ3cVVhCmErZXZYQUcvZldhekF2dzJuS3VESisvdldXQnlQdER2TUNyRDNQNkxhZk5aY2s3Y044YjZ1Y2pHS3JpUVg3YncKUDVvQ1Vsd21HaTVWKzBHdkt1UmdGWkxpbStVektQUFhiUGVMVzlaNlo1U0tsM0RwY0FKcmtCZ3N4bTVQMzZITApvUWs9Ci0tLS0tRU5EIENFUlRJRklDQVRFLS0tLS0K
server: https://192.168.248.209:6443
name: kubernetes
contexts:
- context:
cluster: kubernetes
user: kube-proxy
name: default
current-context: default
kind: Config
preferences: {}
users:
- name: kube-proxy
user:
client-certificate: /opt/kubernetes/ssl/kube-proxy.pem
client-key: /opt/kubernetes/ssl/kube-proxy-key.pem
#vim /opt/kubernetes/cfg/kube-proxy-config.yml
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
metricsBindAddress: 192.168.248.162:10249
clientConnection:
kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig
hostnameOverride: 192.168.248.162
clusterCIDR: 10.244.0.0/24
#创建kube-proxy系统服务
vim /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Proxy
After=network.target
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf
ExecStart=/opt/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
#将配置文件和系统服务文件分发到各node节点即可启动服务
systemctl daemon-reload
systemctl enable kubelet kube-proxy
systemctl restart kubelet kube-proxy
systemctl status kubelet kube-proxy
查看节点
kubectl get node NAME STATUS ROLES AGE VERSION 192.168.248.162 NotReady <none> 7s v1.18.6
注：由于网络插件还没有部署，节点会没有准备就绪 NotReady
部署CNI网络
先准备好CNI二进制文件：
下载地址：https://github.com/containernetworking/plugins/releases/download/v0.8.6/cni-plugins-linux-amd64-v0.8.6.tgz
解压二进制包并移动到默认工作目录：
mkdir /opt/cni/bin tar zxvf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin
部署CNI网络：
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml sed -i -r "s#quay.io/coreos/flannel:.*-amd64#lizhenliang/flannel:v0.12.0-amd64#g" kube-flannel.yml
默认镜像地址无法访问，修改为docker hub镜像仓库。
# cat kube-flannel.yaml
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: psp.flannel.unprivileged
annotations:
seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
privileged: false
volumes:
- configMap
- secret
- emptyDir
- hostPath
allowedHostPaths:
- pathPrefix: "/etc/cni/net.d"
- pathPrefix: "/etc/kube-flannel"
- pathPrefix: "/run/flannel"
readOnlyRootFilesystem: false
# Users and groups
runAsUser:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
fsGroup:
rule: RunAsAny
# Privilege Escalation
allowPrivilegeEscalation: false
defaultAllowPrivilegeEscalation: false
# Capabilities
allowedCapabilities: ['NET_ADMIN', 'NET_RAW']
defaultAddCapabilities: []
requiredDropCapabilities: []
# Host namespaces
hostPID: false
hostIPC: false
hostNetwork: true
hostPorts:
- min: 0
max: 65535
# SELinux
seLinux:
# SELinux is unused in CaaSP
rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: flannel
rules:
- apiGroups: ['extensions']
resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames: ['psp.flannel.unprivileged']
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-system
labels:
tier: node
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-amd64
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- amd64
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: lizhenliang/flannel:v0.12.0-amd64
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: lizhenliang/flannel:v0.12.0-amd64
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-arm64
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- arm64
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-arm64
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-arm64
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-arm
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- arm
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-arm
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-arm
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-ppc64le
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- ppc64le
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-ppc64le
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-ppc64le
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds-s390x
namespace: kube-system
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
- key: kubernetes.io/arch
operator: In
values:
- s390x
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.12.0-s390x
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: quay.io/coreos/flannel:v0.12.0-s390x
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
# kubectl apply –f kube-flannel.yaml
# kubectl get pods -n kube-system
部署好网络插件，Node准备就绪。
授权apiserver访问kubelet
# cat apiserver-to-kubelet-rbac.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:kube-apiserver-to-kubelet
rules:
- apiGroups:
- ""
resources:
- nodes/proxy
- nodes/stats
- nodes/log
- nodes/spec
- nodes/metrics
- pods/log
verbs:
- "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:kube-apiserver
namespace: ""
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:kube-apiserver-to-kubelet
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: User
name: kubernetes
# kubectl apply -f apiserver-to-kubelet-rbac.yaml
部署dashboard（默认Dashboard只能集群内部访问，修改Service为NodePort类型，暴露到外部）
# wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta4/aio/deploy/recommended.yaml
# vim recommended.yaml
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
ports:
- port: 443
targetPort: 8443
nodePort: 30001
type: NodePort
selector:
k8s-app: kubernetes-dashboard
# kubectl apply -f recommended.yaml
访问地址：https://NodeIP:30001
创建service account并绑定默认cluster-admin管理员集群角色：
kubectl create serviceaccount dashboard-admin -n kube-system
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
使用输出的token登录Dashboard。
部署coredns
# cat coredns.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
labels:
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
addonmanager.kubernetes.io/mode: Reconcile
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
addonmanager.kubernetes.io/mode: EnsureExists
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
labels:
addonmanager.kubernetes.io/mode: EnsureExists
data:
Corefile: |
.:53 {
errors
health
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
upstream
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
proxy . /etc/resolv.conf
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "CoreDNS"
spec:
# replicas: not specified here:
# 1. In order to make Addon Manager do not reconcile this replicas parameter.
# 2. Default is 1.
# 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
annotations:
seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
spec:
serviceAccountName: coredns
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
- key: "CriticalAddonsOnly"
operator: "Exists"
containers:
- name: coredns
image: coredns/coredns:1.2.6
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.0.0.2
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
# kubectl apply -f coredns.yaml
DNS解析测试：
[root@192 opt]# kubectl run -it --rm dns-test --image=busybox:1.28.4 sh If you don't see a command prompt, try pressing enter. / # nslookup kubernetes Server: 10.0.0.2 Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local Name: kubernetes Address 1: 10.0.0.1 kubernetes.default.svc.cluster.local / #
备注：
1、TLS Bootstraping
TLS Bootstraping：Master apiserver启用TLS认证后，Node节点kubelet和kube-proxy要与kube-apiserver进行通信，必须使用CA签发的有效证书才可以，当Node节点很多时，这种客户端证书颁发需要大量工作，同样也会增加集群扩展复杂度。为了简化流程，Kubernetes引入了TLS bootstraping机制来自动颁发客户端证书，kubelet会以一个低权限用户自动向apiserver申请证书，kubelet的证书由apiserver动态签署。所以强烈建议在Node上使用这种方式，目前主要用于kubelet，kube-proxy还是由我们统一颁发一个证书。
TLS bootstraping 工作流程：
创建上述配置文件中token文件：
cat > /opt/kubernetes/cfg/token.csv << EOF c47ffb939f5ca36231d9e3121a252940,kubelet-bootstrap,10001,"system:node-bootstrapper" EOF
格式：token，用户名，UID，用户组
token也可自行生成替换：
head -c 16 /dev/urandom | od -An -t x | tr -d ' '
参考：https://www.cnblogs.com/wyt007/p/13356734.html?utm_source=tuicool
参考：https://www.cnblogs.com/yuezhimi/p/12931002.html
参考：https://www.jianshu.com/p/49a4dcd30313
高可用的K8S集群部署方案：https://www.cnblogs.com/ants/p/11489598.html