K8S 之master 节点的安装与配置

之前我们已经把K8s的必要组件etcd flanneld 和相关的证书都已经安装好了，现在我们来安装k8s的主节点。
下载地址 https://github.com/kubernetes/kubernetes/releases 在列表中选择对应的版本。如：

wget https://dl.k8s.io/v1.10.2/kubernetes-server-linux-amd64.tar.gz

tar -zxvf  kubernetes-server-linux-amd64.tar.gz

文件解压后我们进入目录找到所有可执行文件 （bin 目录），把kubectl kube-apiserver kube-controller-manager kube-scheduler文件复制到/opt/kubernetes/bin目录下 ，并给于相关的可执行权限 chmod +x
为了以后执行方便我们也可以通过 cp kubectl /bin/ 命令让kubectl在执行的时候去掉 ./

到现在准备工作已完成，现在开始安装master节点

1.生成相关的配置文件

1.创建 TLS Bootstrapping Token

export BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')
cat > token.csv <<EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

2.创建kubelet bootstrap.kubeconfig

export KUBE_APISERVER="https://192.168.1.6:6443"

# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=./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=${BOOTSTRAP_TOKEN} \

# 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

3.创建kube-proxy kubeconfig文件

kubectl config set-cluster kubernetes \
  --certificate-authority=./ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-credentials kube-proxy \
  --client-certificate=./ssl/kube-proxy.pem \
  --client-key=./ssl/kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

2.安装api-server

为了更快接的安装在此我们生成一个shell脚本，首先定义shell脚本的两个参数

MASTER_ADDRESS=${1:-"192.168.1.6"}
ETCD_SERVERS=${2:-"http://127.0.0.1:2379"}

1.生成api-server的配置

cat </opt/kubernetes/cfg/kube-apiserver

KUBE_APISERVER_OPTS="--logtostderr=true \\
--v=4 \\
--etcd-servers=${ETCD_SERVERS} \\
--insecure-bind-address=127.0.0.1 \\
--bind-address=${MASTER_ADDRESS} \\
--insecure-port=8080 \\
--secure-port=6443 \\
--advertise-address=${MASTER_ADDRESS} \\
--allow-privileged=true \\
--service-cluster-ip-range=10.10.10.0/24 \\
--admission-control=NamespaceLifecycle,LimitRanger,SecurityContextDeny,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/kubernetes/ssl/ca.pem \\
--etcd-certfile=/opt/kubernetes/ssl/server.pem \\
--etcd-keyfile=/opt/kubernetes/ssl/server-key.pem"

EOF

2.api-server服务配置

cat </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

3.刷新服务配置并启动服务

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

因为我们用的是双向证书认证，docker节点在请求的时候需要master节点认证并颁发证书，那我们就要授于相关的权限了

kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap

3.安装kube-controller-manager

同样为快速安装我们也要生成一个shell文件，先来定义一个参数

MASTER_ADDRESS=${1:-"127.0.0.1"}

1.kube-controller-manager配置

cat </opt/kubernetes/cfg/kube-controller-manager

KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \\
--v=4 \\
--master=${MASTER_ADDRESS}:8080 \\
--leader-elect=true \\
--address=127.0.0.1 \\
--service-cluster-ip-range=10.10.10.0/24 \\
--cluster-name=kubernetes \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem"
EOF

2.kube-controller-manager服务配置

cat </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

3.执行shell并启动服务

systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager

4.安装kube-scheduler

同样为快速安装我们也要生成一个shell文件，先来定义一个参数

MASTER_ADDRESS=${1:-"127.0.0.1"}

1.kube-scheduler配置

cat </opt/kubernetes/cfg/kube-scheduler

KUBE_SCHEDULER_OPTS="--logtostderr=true \\
--v=4 \\
--master=${MASTER_ADDRESS}:8080 \\
--leader-elect"

EOF

2.kube-scheduler服务配置

cat </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

3.执行shell并启动服务

“`
systemctl daemon-reload
systemctl enable kube-scheduler
systemctl restart kube-scheduler

所有master节点的服务全部安装成功