K8S单master部署三：APIserver+Controller-Manager+Schedul

2022-07-09 20:23:59

以下所有操作均在master端进行

服务器角色分配

角色	地址	安装组件
master	192.168.142.220	kube-apiserver kube-controller-manager kube-scheduler etcd
node1	192.168.142.136	kubelet kube-proxy docker flannel etcd
node2	192.168.142.132	kubelet kube-proxy docker flannel etcd

一、APIserver服务部署

建立apiserver安装站点

[root@master k8s]# pwd
/k8s
[root@master k8s]# mkdir apiserver
[root@master k8s]# cd apiserver/

建立ca证书（注意路径问题！！）

//定义ca证书，生成ca证书配置文件
[root@master apiserver]# cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

//生成证书签名文件
[root@master apiserver]# cat > ca-csr.json << EOF
{
    "CN": "kubernetes",
    "key": {
         "algo": "rsa",
         "size": 2048
    },
    "names": [
       {
              "C": "CN",
              "L": "Beijing",
              "ST": "Beijing",
              "O": "k8s",
              "OU": "System"
       }
    ]
}
EOF

//证书签名（生成ca.pem ca-key.pem）
[root@master apiserver]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

建立apiserver通信证书

//定义apiserver证书，生成apiserver证书配置文件
[root@master apiserver]# cat > server-csr.json <<EOF
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "192.168.142.220",  //master1(注意地址变更)
      "192.168.142.120",  //master2（后期双节点）
      "192.168.142.20",    //vip
      "192.168.142.130",  //lb nginx负载均衡（master）
      "192.168.142.140",  //lb （backup）
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

//证书签名（生成server.pem server-key.pem）
[root@master apiserver]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

建立admin证书

[root@master apiserver]# cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

//证书签名（生成admin.pem admin-key.epm）
[root@master apiserver]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

建立kube-proxy证书

[root@master apiserver]# cat > kube-proxy-csr.json <<EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

//证书签名（生成kube-proxy.pem kube-proxy-key.pem）
[root@master apiserver]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

总共应该生成8个证书

[root@master apiserver]# ls *.pem
admin-key.pem  ca-key.pem  kube-proxy-key.pem  server-key.pem
admin.pem      ca.pem      kube-proxy.pem      server.pem

复制启动命令

//建立存放站点
[root@master apiserver]# mkdir -p /opt/kubernetes/{bin,ssl,cfg}
[root@master apiserver]# cp -p *.pem /opt/kubernetes/ssl/

//复制启动脚本
[root@master k8s]# tar zxvf kubernetes-server-linux-amd64.tar.gz
[root@master k8s]# cd kubernetes/server/bin/
[root@master bin]# cp -p kube-apiserver kubectl /opt/kubernetes/bin/

创建token文件

[root@master bin]# cd /opt/kubernetes/cfg

//生成随机的令牌
[root@master cfg]# export BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ‘ ‘)
[root@master cfg]# cat > token.csv << EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

创建apiserver启动脚本

[root@master cfg]# vim /usr/lib/systemd/system/kube-apiserver.service
//手动进行编写
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver
ExecStart=/opt/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

//提权方便识别
[root@master cfg]# chmod +x /usr/lib/systemd/system/kube-apiserver.service

创建apiserver配置文件

[root@master ssl]# vim /opt/kubernetes/cfg/kube-apiserver
//进行手工编写，注意IP地址的变更
KUBE_APISERVER_OPTS="--logtostderr=true --v=4 --etcd-servers=https://192.168.142.220:2379,https://192.168.142.136:2379,https://192.168.142.132:2379 --bind-address=192.168.142.220 --secure-port=6443 --advertise-address=192.168.142.220 --allow-privileged=true --service-cluster-ip-range=10.0.0.0/24 --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction --authorization-mode=RBAC,Node --kubelet-https=true --enable-bootstrap-token-auth --token-auth-file=/opt/kubernetes/cfg/token.csv --service-node-port-range=30000-50000 --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"

[root@master ssl]# mkdir -p /var/log/kubernetes/apiserver

apiserver服务启动

[root@master cfg]# systemctl daemon-reload
[root@master cfg]# systemctl start kube-apiserver
[root@master cfg]# systemctl status kube-apiserver
[root@master cfg]# systemctl enable kube-apiserver

检查服务启动情况

[root@master bin]# netstat -atnp | egrep "(6443|8080)"      
//6443为http使用端口；8080位https使用端口
tcp        0      0 192.168.142.220:6443    0.0.0.0:*               LISTEN      12898/kube-apiserve
tcp        0      0 127.0.0.1:8080          0.0.0.0:*               LISTEN      12898/kube-apiserve
tcp        0      0 192.168.142.220:6443    192.168.142.220:60052   ESTABLISHED 12898/kube-apiserve
tcp        0      0 192.168.142.220:60052   192.168.142.220:6443    ESTABLISHED 12898/kube-apiserve

二、Controller-Manager服务部署

移动控制命令

[root@master bin]# pwd
/k8s/kubernetes/server/bin
//移动脚本
[root@master bin]# cp -p kube-controller-manager /opt/kubernetes/bin/

编写kube-controller-manager配置文件

[root@master bin]# cat <<EOF >/opt/kubernetes/cfg/kube-controller-manager
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect=true --address=127.0.0.1 --service-cluster-ip-range=10.0.0.0/24 --cluster-name=kubernetes --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"

EOF

编写kube-controller-manager启动脚本

[root@master bin]# cat <<EOF >/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
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

启动服务

//提权并启动
[root@master cfg]# chmod +x /usr/lib/systemd/system/kube-controller-manager.service
[root@master cfg]# systemctl start kube-controller-manager
[root@master cfg]# systemctl status kube-controller-manager
[root@master cfg]# systemctl enable kube-controller-manager

查看服务启动情况

[root@master bin]# netstat -atnp | grep kube-controll
tcp        0      0 127.0.0.1:10252         0.0.0.0:*               LISTEN      12964/kube-controll
tcp6       0      0 :::10257                :::*                    LISTEN      12964/kube-controll

三、Scheruler服务部署

移动控制命令

[root@master bin]# pwd
/k8s/kubernetes/server/bin
//移动脚本
[root@master bin]# cp -p kube-scheduler /opt/kubernetes/bin/

编写配置文件

[root@master bin]# cat <<EOF >/opt/kubernetes/cfg/kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect"
EOF

编写启动脚本

[root@master bin]# cat <<EOF >/usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-scheduler
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

开启服务

[root@master bin]# chmod +x /usr/lib/systemd/system/kube-scheduler.service
[root@master bin]# systemctl daemon-reload
[root@master bin]# systemctl start kube-scheduler
[root@master bin]# systemctl status kube-scheduler
[root@master bin]# systemctl enable kube-scheduler

查看服务启动情况

[root@master bin]# netstat -atnp | grep schedule
tcp6       0      0 :::10251                :::*                    LISTEN

以上，就是master节点上需要部署的所有服务的全部部署过程。

//查看master节点状态
[root@master bin]# /opt/kubernetes/bin/kubectl get cs
//如果成功则应该全部为healthy
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok
controller-manager   Healthy   ok
etcd-0               Healthy   {"health":"true"}
etcd-1               Healthy   {"health":"true"}
etcd-2               Healthy   {"health":"true"}

未完待续~~~

K8S单master部署三：APIserver+Controller-Manager+Schedul

码农公寓

服务器角色分配

一、APIserver服务部署

建立apiserver安装站点

建立ca证书（注意路径问题！！）

建立apiserver通信证书

建立admin证书

建立kube-proxy证书

总共应该生成8个证书

复制启动命令

创建token文件

创建apiserver启动脚本

创建apiserver配置文件

apiserver服务启动

检查服务启动情况

二、Controller-Manager服务部署

移动控制命令

编写kube-controller-manager配置文件

编写kube-controller-manager启动脚本

启动服务

查看服务启动情况

三、Scheruler服务部署

移动控制命令

编写配置文件

编写启动脚本

开启服务

查看服务启动情况

未完待续~~~

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