四、部署node节点

kubelet的启动流程

1. kubelet-bootstrap为用户名称，10001是一个用户ID，system:kubelet-bootstrap是 kubelet-bootstrap用户的角色权限

[root@k8s-master01 cfg]# cat token.csv 
0fb61c46f8991b718eb38d27b605b008,kubelet-bootstrap,10001,"system:kubelet-bootstrap"

2.在master上操作给kubelet-bootstrap用户授权一个较小的办法证书的权限，绑定到系统集群角色

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

3.创建kubeconfig文件，这里通过kubeconfig.sh脚本来生成

vim kubeconfig.sh

# 创建 TLS Bootstrapping Token
#BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')
BOOTSTRAP_TOKEN=0fb61c46f8991b718eb38d27b605b008

cat > token.csv <<EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

#----------------------

APISERVER=$1
SSL_DIR=$2

# 创建kubelet bootstrapping kubeconfig 
export KUBE_APISERVER="https://$APISERVER:6443"

# 设置集群参数
kubectl config set-cluster kubernetes 
  --certificate-authority=$SSL_DIR/ca.pem 
  --embed-certs=true 
  --server=${KUBE_APISERVER} 
  --kubeconfig=bootstrap.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap 
  --token=${BOOTSTRAP_TOKEN} 
  --kubeconfig=bootstrap.kubeconfig

# 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

#----------------------

# 创建kube-proxy kubeconfig文件

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

kubectl config set-credentials kube-proxy 
  --client-certificate=$SSL_DIR/kube-proxy.pem 
  --client-key=$SSL_DIR/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

View Code

执行kubeconfig.sh脚本生成kubeconfig文件

[root@k8s-master01 master]# bash kubeconfig.sh 172.16.204.133 /opt/k8s/k8s-cert

[root@k8s-master01 master]# ls
apiserver.sh bootstrap.kubeconfig controller-manager.sh kubeconfig.sh kube-proxy.kubeconfig scheduler.sh token.csv

将在master上生成的kubeconfig文件和二进制文件拷贝到node节点的/opt/k8s/kubernetes/cfg

[root@k8s-master01 master]# scp -rp bootstrap.kubeconfig kube-proxy.kubeconfig root@172.16.204.134:/opt/k8s/kubernetes/cfg/                                                                                                                                           100% 6274     2.2MB/s   00:00    
[root@k8s-master01 master]# scp -rp bootstrap.kubeconfig kube-proxy.kubeconfig root@172.16.204.135:/opt/k8s/kubernetes/cfg/
[root@k8s-master01 bin]# cd /opt/k8s/soft/kubernetes/server/bin/
[root@k8s-master01 bin]# scp -r kubelet kube-proxy root@172.16.204.134:/opt/k8s/kubernetes/bin/
[root@k8s-master01 bin]# scp -r kubelet kube-proxy  root@172.16.204.135:/opt/k8s/kubernetes/bin/

万事具备，开始部署node节点啦。。。。。

依然是通过脚本来部署kubelet和proxy

vim kubelet.sh

#!/bin/bash

NODE_ADDRESS=$1
#指定默认dns服务器地址：我本地是:172.16.204.2
DNS_SERVER_IP=${2:-"172.16.204.2"}

cat <<EOF >/opt/k8s/kubernetes/cfg/kubelet

KUBELET_OPTS="--logtostderr=true \
--v=4 \
--address=${NODE_ADDRESS} \
--hostname-override=${NODE_ADDRESS} \
--kubeconfig=/opt/k8s/kubernetes/cfg/kubelet.kubeconfig \
--experimental-bootstrap-kubeconfig=/opt/k8s/kubernetes/cfg/bootstrap.kubeconfig \
--config=/opt/k8s/kubernetes/cfg/kubelet.config \
--cert-dir=/opt/k8s/kubernetes/ssl \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"

EOF

cat <<EOF >/opt/k8s/kubernetes/cfg/kubelet.config

kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: ${NODE_ADDRESS}
port: 10250
cgroupDriver: cgroupfs
clusterDNS:
- ${DNS_SERVER_IP} 
clusterDomain: cluster.local.
failSwapOn: false

EOF

cat <<EOF >/usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service

[Service]
EnvironmentFile=/opt/k8s/kubernetes/cfg/kubelet
ExecStart=/opt/k8s/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
KillMode=process

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kubelet
systemctl restart kubelet

View Code

vim proxy.sh

#!/bin/bash

NODE_ADDRESS=$1

cat <<EOF >/opt/k8s/kubernetes/cfg/kube-proxy

KUBE_PROXY_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=${NODE_ADDRESS} \
--cluster-cidr=10.0.0.0/24 \
--proxy-mode=ipvs \
--kubeconfig=/opt/k8s/kubernetes/cfg/kube-proxy.kubeconfig"

EOF

cat <<EOF >/usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=-/opt/k8s/kubernetes/cfg/kube-proxy
ExecStart=/opt/k8s/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-proxy
systemctl restart kube-proxy

View Code

采坑：

kube-controller-manager启动后报错：failed to acquire lease kube-system/　　

将可执行文件路/k8s/kubernetes/ 添加到 PATH 变量中

vim /etc/profile
PATH=/opt/k8s/kubernetes/bin:$PATH:$HOME/bin
source /etc/profile

=====================好多坑放弃了================