kubernetes部署kube-controller-manager服务
本文档介绍部署高可用 kube-controller-manager 集群的步骤。
该集群包含 3 个节点,启动后将通过竞争选举机制产生一个 leader 节点,其它节点为阻塞状态。当 leader 节点不可用后,剩余节点将再次进行选举产生新的 leader 节点,从而保证服务的可用性。
以下是非认证的的配置文件(用127.0.0.1连接kube-apiserver):
cat > /lib/systemd/system/kube-controller-manager.service <<"EOF"
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
--address=127.0.0.1 \
--master=http://127.0.0.1:8080 \
--allocate-node-cidrs=true \
--service-cluster-ip-range=10.254.0.0/16 \
--cluster-cidr=172.30.0.0/16 \
--cluster-name=kubernetes \
--leader-elect=true \
--cluster-signing-cert-file=/etc/kubernetes/ca/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/ca/ca-key.pem \
--service-account-private-key-file=/etc/kubernetes/ca/ca-key.pem \
--root-ca-file=/etc/kubernetes/ca/ca.pem \
--v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
这个简单很多,但是以后可能会取消,如果要使用认证授权的方式看下面:
------------------------------------------------------------------
为保证通信安全,本文档先生成 x509 证书和私钥,kube-controller-manager 在如下两种情况下使用该证书:
与 kube-apiserver 的安全端口通信时;
在安全端口(https,10252) 输出 prometheus 格式的 metrics;
创建 kube-controller-manager 证书和私钥
cat > kube-controller-manager-csr.json <<EOF
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"hosts": [
"127.0.0.1",
"192.168.111.10",
"192.168.111.11",
"192.168.111.12"
],
"names": [
{
"C": "CN",
"ST": "ChongQing",
"L": "ChongQing",
"O": "system:kube-controller-manager",
"OU": "yunwei"
}
]
}
EOF cfssl gencert -ca=/etc/kubernetes/ca/ca.pem \
-ca-key=/etc/kubernetes/ca/ca-key.pem \
-config=/etc/kubernetes/ca/ca-config.json \
-profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager
创建和分发 kubeconfig 文件
kubeconfig 文件包含访问 apiserver 的所有信息,如 apiserver 地址、CA 证书和自身使用的证书;
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/ca/ca.pem \
--embed-certs=true \
--server=https://192.168.111.9:8443 \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-credentials system:kube-controller-manager \
--client-certificate=/etc/kubernetes/ca/kube-controller-manager.pem \
--client-key=/etc/kubernetes/ca/kube-controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-context system:kube-controller-manager \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=kube-controller-manager.kubeconfig
kubectl config use-context system:kube-controller-manager --kubeconfig=kube-controller-manager.kubeconfig
分发 kubeconfig 到所有 master 节点:
# scp kube-controller-manager.kubeconfig 192.168.111.11:/etc/kubernetes/
# scp kube-controller-manager.kubeconfig 192.168.111.12:/etc/kubernetes/
创建和分发 kube-controller-manager systemd unit 文件:
cat > /lib/systemd/system/kube-controller-manager.service <<"EOF"
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes [Service]
ExecStart=/usr/local/bin/kube-controller-manager \
--port=0 \
--secure-port=10252 \
--kubeconfig=/etc/kubernetes/kube-controller-manager.kubeconfig \
--service-cluster-ip-range=10.254.0.0/16 \
--cluster-signing-cert-file=/etc/kubernetes/ca/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/ca/ca-key.pem \
--root-ca-file=/etc/kubernetes/ca/ca.pem \
--service-account-private-key-file=/etc/kubernetes/ca/ca-key.pem \
--leader-elect=true \
--feature-gates=RotateKubeletServerCertificate=true \
--controllers=*,bootstrapsigner,tokencleaner \
--horizontal-pod-autoscaler-use-rest-clients=true \
--horizontal-pod-autoscaler-sync-period=10s \
--tls-cert-file=/etc/kubernetes/ca/kube-controller-manager.pem \
--tls-private-key-file=/etc/kubernetes/ca/kube-controller-manager-key.pem \
--use-service-account-credentials=true \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=2
Restart=on
Restart=on-failure
RestartSec=5
User=k8s [Install]
WantedBy=multi-user.target
EOF
-------------------------------------------------
启动kube-controller-manager
# systemctl daemon-reload&&for SERVICES in kube-controller-manager;do systemctl enable $SERVICES; systemctl start $SERVICES; systemctl status $SERVICES; done
查看输出的 metric
注意:以下命令在 kube-controller-manager 节点上执行。
kube-controller-manager 监听 10252 端口,接收 https 请求:
# ss -lnpt|grep kube-controll
# curl http://127.0.0.1:10252/metrics |head
测试 kube-controller-manager 集群的高可用
停掉一个或两个节点的 kube-controller-manager 服务,观察其它节点的日志,看是否获取了 leader 权限。
查看当前的 leader
kubectl get endpoints kube-controller-manager --namespace=kube-system -o yaml
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