kubernetes（三）二进制安装-etcd安装

部署 etcd（在master节点上执行）

1. 下载安装etcd

   cd /opt/k8s/work
   wget https://github.com/etcd-io/etcd/releases/download/v3.3.18/etcd-v3.3.18-linux-amd64.tar.gz
   tar -xvf etcd-v3.3.18-linux-amd64.tar.gz
   

2. 安装etcd

   cd /opt/k8s/work
   
   cp etcd-v3.3.18-linux-amd64/etcd* /opt/k8s/bin/
   chmod +x /opt/k8s/bin/*
   
   

3. 创建 etcd 证书和私钥

   1. 创建证书签名请求文件

      
      cd /opt/k8s/work
      cat > etcd-csr.json <<EOF
      {
        "CN": "etcd",
        "hosts": [
          "127.0.0.1",
          "192.168.0.107"
        ],
        "key": {
          "algo": "rsa",
          "size": 2048
        },
        "names": [
          {
            "C": "CN",
            "ST": "NanJing",
            "L": "NanJing",
            "O": "k8s",
            "OU": "system"
          }
        ]
      }
      EOF
      
      

      • 指定授权使用该证书的 etcd 节点 IP 列表

   2. 生成证书和私钥

      cd /opt/k8s/work
      cfssl gencert -ca=/opt/k8s/work/ca.pem 
          -ca-key=/opt/k8s/work/ca-key.pem 
          -config=/opt/k8s/work/ca-config.json 
          -profile=kubernetes etcd-csr.json | cfssljson -bare etcd
      ls etcd*pem
      
      

   3. 安装证书

      cd /opt/k8s/work
      cp etcd*.pem /etc/etcd/cert/
      

4. 创建etcd启动文件

   cat> /etc/systemd/system/etcd.service<< EOF
   [Unit]
   Description=Etcd Server
   After=network.target
   After=network-online.target
   Wants=network-online.target
   Documentation=https://github.com/coreos
   
   [Service]
   Type=notify
   WorkingDirectory=/data/k8s/etcd/data
   ExecStart=/opt/k8s/bin/etcd \
     --data-dir=/etc/etcd/cfg/etcd \
     --name=etcd-chengf \
     --cert-file=/etc/etcd/cert/etcd.pem \
     --key-file=/etc/etcd/cert/etcd-key.pem \
     --trusted-ca-file=/etc/kubernetes/cert/ca.pem \
     --peer-cert-file=/etc/etcd/cert/etcd.pem \
     --peer-key-file=/etc/etcd/cert/etcd-key.pem \
     --peer-trusted-ca-file=/etc/kubernetes/cert/ca.pem \
     --peer-client-cert-auth \
     --client-cert-auth \
     --listen-peer-urls=https://192.168.0.107:2380 \
     --initial-advertise-peer-urls=https://192.168.0.107:2380 \
     --listen-client-urls=https://192.168.0.107:2379,http://127.0.0.1:2379 \
     --advertise-client-urls=https://192.168.0.107:2379 \
     --initial-cluster-token=etcd-cluster-0\
     --initial-cluster=etcd-chengf=https://192.168.0.107:2380 \
     --initial-cluster-state=new \
     --auto-compaction-mode=periodic \
     --auto-compaction-retention=1 \
     --max-request-bytes=33554432 \
     --quota-backend-bytes=6442450944 \
     --heartbeat-interval=250 \
     --election-timeout=2000
   Restart=on-failure
   RestartSec=5
   LimitNOFILE=65536
   
   [Install]
   WantedBy=multi-user.target
   EOF
   
   

   • WorkingDirectory、--data-dir：指定工作目录和数据目录，需在启动服务前创建这个目录；
   • --name：指定节点名称，当 --initial-cluster-state 值为 new 时，--name 的参数值必须位于 --initial-cluster 列表中；
   • --cert-file、--key-file：etcd server 与 client 通信时使用的证书和私钥；
   • --trusted-ca-file：签名 client 证书的 CA 证书，用于验证 client 证书；
   • --peer-cert-file、--peer-key-file：etcd 与 peer 通信使用的证书和私钥；
   • --peer-trusted-ca-file：签名 peer 证书的 CA 证书，用于验证 peer 证书；

5. 创建etcd数据目录

   mkdir -p /data/k8s/etcd/data
   

6. 启动 etcd 服务

   systemctl enable etcd && systemctl start etcd
   
   

7. 检查启动结果

   systemctl status etcd|grep Active
   

   • 确保状态为 active (running)，否则查看日志，确认原因

   • 如果出现异常，通过如下命令查看

     journalctl -u etcd
     

8. 验证服务状态

   export ETCD_ENDPOINTS=https://192.168.0.107:2379
   
   etcdctl 
   --endpoints=${ETCD_ENDPOINTS} 
   --ca-file=/etc/kubernetes/cert/ca.pem 
   --cert-file=/etc/etcd/cert/etcd.pem 
   --key-file=/etc/etcd/cert/etcd-key.pem cluster-health
   

   etcdctl 
   --endpoints=${ETCD_ENDPOINTS} 
   --ca-file=/etc/kubernetes/cert/ca.pem 
   --cert-file=/etc/etcd/cert/etcd.pem 
   --key-file=/etc/etcd/cert/etcd-key.pem member list
   

   输出结果

   root@master:/opt/k8s/work# etcdctl     --endpoints=${ETCD_ENDPOINTS}     --ca-file=/etc/kubernetes/cert/ca.pem     --cert-file=/etc/etcd/cert/etcd.pem     --key-file=/etc/etcd/cert/etcd-key.pem cluster-health
   

member c0d3b56a9878e38f is healthy: got healthy result from https://192.168.0.107:2379
cluster is healthy
root@master:/opt/k8s/work# etcdctl --endpoints=${ETCD_ENDPOINTS} --ca-file=/etc/kubernetes/cert/ca.pem --cert-file=/etc/etcd/cert/etcd.pem --key-file=/etc/etcd/cert/etcd-key.pemmember list
c0d3b56a9878e38f: name=etcd-chengf peerURLs=https://192.168.0.107:2380 clientURLs=https://192.168.0.107:2379 isLeader=true
```