第五篇 K8S集群部署之Master节点组件部署

在部署Kubernetes之前一定要确保etcd、flannel、docker是正常运行的，否则先解决问题再继续。

一 生成证书

mkdir -d /root/k8s/k8s-cert
cd /root/k8s/k8s-cert
cat << EOF | tee ca-config.json
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

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

cat << EOF | tee server-csr.json
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "192.168.0.201",
      "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

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

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 kube-proxy-csr.json | cfssljson -bare kube-proxy
mv *pem /opt/kubernetes/ssl/

二 部署apiserver组件

下载github中server的二进制包：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.16.md#downloads-for-v1162
其中的下载地址被墙了，可以通过百度云盘备份的下载
链接: https://pan.baidu.com/s/1CkoME6ztfDeoj2XDnF0jzQ 提取码: vfy6

mkdir /opt/kubernetes/{bin,cfg,ssl} -p
tar zxvf kubernetes-server-linux-amd64.tar.gz
cd kubernetes/server/bin
cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin

# 创建token文件配置
# 第一列：随机字符串，自己可生成  
# 第二列：用户名  
# 第三列：UID  
# 第四列：用户组
cat << EOF | tee /opt/kubernetes/cfg/token.csv
674c457d4dcf2eefe4920d7dbb6b0ddc,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

# 创建apiserver配置文件
# --logtostderr 启用日志
# ---v 日志等级
# --etcd-servers etcd集群地址
# --bind-address 监听地址
# --secure-port https安全端口
# --advertise-address 集群通告地址
# --allow-privileged 启用授权
# --service-cluster-ip-range Service虚拟IP地址段
# --enable-admission-plugins 准入控制模块
# --authorization-mode 认证授权，启用RBAC授权和节点自管理
# --enable-bootstrap-token-auth 启用TLS bootstrap功能，后面会讲到
# --token-auth-file token文件
# --service-node-port-range Service Node类型默认分配端口范围
cat << EOF | tee /opt/kubernetes/cfg/kube-apiserver 
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.0.201:2379,https://192.168.0.211:2379,https://192.168.0.212:2379 \
--bind-address=192.168.0.201 \
--secure-port=6443 \
--advertise-address=192.168.0.201 \
--allow-privileged=true \
--service-cluster-ip-range=10.0.0.0/24 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--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"
EOF

# systemd管理apiserver
cat << EOF | tee /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
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

# 启动
systemctl daemon-reload
systemctl enable kube-apiserver
systemctl restart kube-apiserver

三 部署scheduler组件

# 创建schduler配置文件
# --master 连接本地apiserver
# --leader-elect 当该组件启动多个时，自动选举（HA）
cat << EOF | tee /opt/kubernetes/cfg/kube-scheduler 
KUBE_SCHEDULER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect"
EOF

# systemd管理schduler组件
cat << EOF | tee /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

# 启动
systemctl daemon-reload
systemctl enable kube-scheduler
systemctl restart kube-scheduler

四 部署controller-manager组件

# 创建controller-manager配置文件
cat << EOF | tee /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

# systemd管理controller-manager组件
cat << EOF | tee /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
systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager

五 所有组件都已经启动成功，通过kubectl工具查看当前集群组件状态

/opt/kubernetes/bin/kubectl get cs