基于docker的etcd高可用集群部署

一时失言乱红尘 2023-01-15 15:24 270阅读 0赞

`工作原理`
    ETCD使用Raft协议来维护集群内各个节点状态的一致性。简单说，ETCD集群是一个分布式系统，由多个节点相互通信构成整体对外服务，每个节点都存储了完整的数据，并且通过Raft协议保证每个节点维护的数据是一致的。

`1、启动容器`

[root@iZuf612i9bshiuw3zzlfe9Z etcd]# docker ps
    CONTAINER ID        IMAGE                       COMMAND                  CREATED             STATUS              PORTS                    NAMES
    cbcba4dd6c44        etcd                        "/usr/sbin/init"         4 seconds ago       Up 2 seconds        0.0.0.0:2379->2379/tcp   etcd_etcd-master_1
    b8dba884f38c        etcd                        "/usr/sbin/init"         4 seconds ago       Up 2 seconds        0.0.0.0:2377->2379/tcp   etcd_etcd-slave2_1
    2af6e886f4f0        etcd                        "/usr/sbin/init"         4 seconds ago       Up 2 seconds        0.0.0.0:2378->2379/tcp   etcd_etcd-slave1_1

`2、新建目录，存放证书、配置文件等`

mkdir -p /opt/etcd/{ bin,cfg,ssl}

`3、生成证书文件`  
`（1）下载工具`

wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
    chmod +x cfssl_linux-amd64
    mv cfssl_linux-amd64 /usr/bin/cfssl
    
    wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
    chmod +x cfssljson_linux-amd64
    mv cfssljson_linux-amd64 /usr/bin/cfssljson
    
    wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
    chmod +x cfssl-certinfo_linux-amd64
    mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

`(2)生成ca证书`

ca-config.json
    { 
          "signing": { 
            "default": { 
            "expiry": "87600h"
            },
            "profiles": { 
              "www": { 
                "expiry": "87600h",
                "usages": [
                  "signing","key encipherment",
                  "server auth",
                  "client auth"
                ]
              }
            }
          }
    }

ca-csr.json
    { 
          "CN": "etcd CA",
          "key": { 
            "algo": "rsa",
            "size": 2048
          },
          "names": [{ 
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
          }]
    }

root@etcd-master:/opt/etcd/ssl# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
    root@etcd-master:/opt/etcd/ssl# ls ca* 
    ca-config.json  ca-csr.json  ca-key.pem  ca.csr  ca.pem

`（3）使用自签 CA 签发 Etcd HTTPS 证书`

server-csr.json
    { 
          "CN": "etcd",
          "hosts": [
            "172.18.62.37",
            "172.18.62.38",
            "172.18.62.39"
          ],
          "key": { 
            "algo": "rsa",
            "size": 2048
          },
          "names": [{ 
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
          }]
    }

root@etcd-master:/opt/etcd/ssl# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
    root@etcd-master:/opt/etcd/ssl# ls server*
    server-csr.json  server-key.pem  server.csr  server.pem

`4、部署etcd`

wget https://github.com/coreos/etcd/releases/download/v3.1.5/etcd-v3.1.5-linux-amd64.tar.gz
    tar xvf etcd-v3.1.5-linux-amd64.tar.gz
    mv etcd-v3.1.5-linux-amd64/etcd /opt/etcd/bin/
    mv etcd-v3.1.5-linux-amd64/etcdctl /opt/etcd/bin/

`5、修改配置文件`

etcd.conf
    #[Member]
    ETCD_NAME="etcd-1"
    ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
    ETCD_LISTEN_PEER_URLS="https://172.18.62.37:2380"
    ETCD_LISTEN_CLIENT_URLS="https://172.18.62.37:2379"
    #[Clustering]
    ETCD_INITIAL_ADVERTISE_PEER_URLS="https://172.18.62.37:2380"
    ETCD_ADVERTISE_CLIENT_URLS="https://172.18.62.37:2379"
    ETCD_INITIAL_CLUSTER="etcd-1=https://172.18.62.37:2380,etcd-2=https://172.18.62.38:2380,etcd-3=https://172.18.62.39:2380"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"

etcd.service
    [Unit]
    Description=Etcd Server
    After=network.target
    After=network-online.target
    Wants=network-online.target
    [Service]
    Type=notify
    EnvironmentFile=/opt/etcd/cfg/etcd.conf
    ExecStart=/opt/etcd/bin/etcd \
    --cert-file=/opt/etcd/ssl/server.pem \
    --key-file=/opt/etcd/ssl/server-key.pem \
    --peer-cert-file=/opt/etcd/ssl/server.pem \
    --peer-key-file=/opt/etcd/ssl/server-key.pem \
    --trusted-ca-file=/opt/etcd/ssl/ca.pem \
    --peer-trusted-ca-file=/opt/etcd/ssl/ca.pem 
    Restart=on-failure
    LimitNOFILE=65536
    [Install]
    WantedBy=multi-user.target

`6、将所有配置拷贝从节点，修改etcd.conf`

scp -r /opt/etcd root@etcd-slave1:/opt
    scp -r /usr/lib/systemd/system/etcd.service root@etcd-slave1:/usr/lib/systemd/system
    scp -r /opt/etcd root@etcd-slave2:/opt
    scp -r /usr/lib/systemd/system/etcd.service root@etcd-slave2:/usr/lib/systemd/system

`7、启动服务`

systemctl daemon-reload 
    systemctl start etcd 
    systemctl enable etcd

`8、验证集群状态`

ETCDCTL_API=3 /opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://172.18.62.37:2379,https://172.18.62.38:2379,https://172.18.62.39:2379" endpoint health

![etcd集群状态][etcd]

[etcd]: /images/20221022/825a33ded354476183fa370723224581.png