Kubernetes安装之七：配置master之controller-manager-优快云博客

本文详细介绍在Kubernetes集群中部署和配置Controller Manager的过程，包括生成证书、创建kubeconfig文件、配置服务参数及启动服务等关键步骤。

都是3个master服务器都需要操作的

1.生成证书

cat > /etc/ssl/kube-controller-manager/kube-controller-manager-csr.json <<EOF{
    "CN": "system:kube-controller-manager",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "hosts": [
      "127.0.0.1",
      "192.168.1.40",
      "192.168.1.41",
      "192.168.1.42" 
    ],
    "names": [
      {
        "C": "CN",
        "ST": "ChengDu",
        "L": "ChengDu",
        "O": "system:kube-controller-manager",
        "OU": "dessler"
      }
    ]
}
EOF复制代码

cfssl gencert -ca=/etc/ssl/ca.pem \
  -ca-key=/etc/ssl/ca-key.pem \
  -config=/etc/ssl/ca-config.json \
  -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager复制代码

2.创建kubeconfig 文件

kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/ssl/ca.pem \
  --embed-certs=true \
  --server=https://192.168.1.43:8443 \
  --kubeconfig=kube-controller-manager.kubeconfig
Cluster "kubernetes" set.

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kubectl config set-credentials system:kube-controller-manager \
  --client-certificate=/etc/ssl/kube-controller-manager/kube-controller-manager.pem \
  --client-key=/etc/ssl/kube-controller-manager/kube-controller-manager-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-controller-manager.kubeconfig
User "system:kube-controller-manager" set.
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 kubectl config set-context system:kube-controller-manager \
   --cluster=kubernetes \
   --user=system:kube-controller-manager \
   --kubeconfig=kube-controller-manager.kubeconfig
Context "system:kube-controller-manager" created.
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kubectl config use-context system:kube-controller-manager --kubeconfig=kube-controller-manager.kubeconfig
Switched to context "system:kube-controller-manager".
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3.分发配置文件证书二进制文件

#分发路径,为了后面的服务调用
/opt/kubernetes/cfg/复制代码

4.配置kube-controller-manager服务

cat > /usr/lib/systemd/system/kube-controller-manager.service <<EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
ExecStart=/opt/kubernetes/bin/kube-controller-manager \\
  --port=0 \\
  --secure-port=10252 \\
  --bind-address=127.0.0.1 \\
  --kubeconfig=/opt/kubernetes/cfg/kube-controller-manager.kubeconfig \\
  --service-cluster-ip-range=10.254.0.0/16 \\
  --cluster-name=kubernetes \\
  --cluster-signing-cert-file=/etc/ssl/ca.pem \\
  --cluster-signing-key-file=/etc/ssl/ca-key.pem \\
  --experimental-cluster-signing-duration=8760h \\
  --root-ca-file=/etc/ssl/ca.pem \\
  --service-account-private-key-file=/etc/ssl/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/ssl/kube-controller-manager/kube-controller-manager.pem \\
  --tls-private-key-file=/etc/ssl/kube-controller-manager/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
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说明：
--port=0：关闭监听 http /metrics 的请求，同时--address 参数无效，--bind-address 参数有效；
--secure-port=10252、--bind-address=0.0.0.0: 在所有网络接口监听 10252 端口的 https /metrics 请求
--kubeconfig：指定 kubeconfig 文件路径，kube-controller-manager 使用它连接和验证 kube-apiserver
--cluster-signing-*-file：签名 TLS Bootstrap 创建的证书
--experimental-cluster-signing-duration：指定 TLS Bootstrap 证书的有效期
--root-ca-file：放置到容器 ServiceAccount 中的 CA 证书，用来对 kube-apiserver 的证书进行校验
--service-account-private-key-file：签名 ServiceAccount 中 Token 的私钥文件，必须和 kube-apiserver 的--service-account-key-file 指定的公钥文件配对使用
--service-cluster-ip-range ：指定 Service Cluster IP 网段，必须和 kube-apiserver 中的同名参数一致
--leader-elect=true：集群运行模式，启用选举功能；被选为 leader 的节点负责处理工作，其它节点为阻塞状态
--feature-gates=RotateKubeletServerCertificate=true：开启 kublet server 证书的自动更新特性
--controllers=*,bootstrapsigner,tokencleaner：启用的控制器列表，tokencleaner 用于自动清理过期的 Bootstrap token
--horizontal-pod-autoscaler-*：custom metrics 相关参数，支持 autoscaling/v2alpha1
--tls-cert-file、--tls-private-key-file：使用 https 输出 metrics 时使用的 Server 证书和秘钥
--use-service-account-credentials=true:
User=k8s：使用 k8s 账户运行
kube-controller-manager 不对请求 https metrics 的 Client 证书进行校验，故不需要指定--tls-ca-file 参数，而且该参数已被淘汰

5.启动服务

ystemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager
systemctl status kube-controller-manager
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6.检查服务状态

 kubectl get endpoints kube-controller-manager --namespace=kube-system  -o yaml
apiVersion: v1
kind: Endpoints
metadata:
  annotations:
    control-plane.alpha.kubernetes.io/leader: '{"holderIdentity":"host40_ad80b214-301e-11e9-9e4e-525400a2fd4d","leaseDurationSeconds":15,"acquireTime":"2019-02-14T06:06:32Z","renewTime":"2019-02-14T06:10:11Z","leaderTransitions":0}'
  creationTimestamp: "2019-02-14T06:06:32Z"
  name: kube-controller-manager
  namespace: kube-system
  resourceVersion: "931"
  selfLink: /api/v1/namespaces/kube-system/endpoints/kube-controller-manager
  uid: ad841617-301e-11e9-9b82-5254006b7ed6

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curl -s --cacert /etc/ssl/ca.pem https://127.0.0.1:10252/metrics
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