kubernetes之etcd集群部署
简介
etcd是一个分布式可靠的键值存储，用于分布式系统的最关键数据，用Go编写的，使用Raft一致性算法来管理高度可用的复制日志重点是：
- 简单：定义明确，面向用户的API（gRPC）
- 安全：具有可选客户端证书身份验证的自动TLS
- 快速：基准测试10,000次/秒
- 可靠：使用Raft正确分布
官网：https://etcd.io/ github:https://github.com/etcd-io/etcd
安装方式
架构：三个节点的etcd集群（192.168.56.10，192.168.56.20，192.168.56.30），试试二进制部署kubernetes,以便熟悉各个组件之间的联系
系统均为centos 7.* x64 。参考学习于（马哥，李振良，dotbalo，崔秀龙等人的书籍，视频或博客，谢谢）
下载cfssl来生成证书
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64 mv cfssl_linux-amd64 /usr/local/bin/cfssl mv cfssljson_linux-amd64 /usr/local/bin/cfssljson mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo
生成证书
创建文件夹，ST/l字段可自行修改，IP根据实际进行修改
#mkdir /opt/ssl
[root@master1 ssl]# more ca-config.json { "signing": { "default": { "expiry": "87600h" }, "profiles": { "www": { "expiry": "87600h", "usages": [ "signing", "key encipherment", "server auth", "client auth" ] } } } } [root@master1 ssl]# more ca-csr.json { "CN": "etcd CA", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Guangzhou", "ST": "Shenzhen" } ] } [root@master1 ssl]# more server-csr.json { "CN": "etcd", "hosts": [ "192.168.56.10", "192.168.56.20", "192.168.56.30" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "Guangzhou", "ST": "Shenzhen" } ] }
生成证书
执行如下命令
1 cfssl gencert -initca ca-csr.json | cfssljson -bare ca - 2 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
部署Etcd
本文使用3.3.10版本。下载地址：https://github.com/etcd-io/etcd/releases/tag/v3.3.10
下载并解压 tar zxvf etcd-v3.3.10-linux-amd64.tar.gz mkdir /opt/etcd/{bin,cfg,ssl} -p mv etcd-v3.3.10-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/
证书拷贝至相应目录
#cd /opt/ssl #cp ca*pem server*pem /opt/etcd/ssl
创建etcd配置文件
注意：不同节点要修改字段（ETCD_LISTEN_PEER_URLS，ETCD_LISTEN_CLIENT_URLS，ETCD_INITIAL_ADVERTISE_PEER_URLS，ETCD_ADVERTISE_CLIENT_URLS）为相应的IP
[root@master1 software]# cat /opt/etcd/cfg/etcd #[Member] ETCD_NAME="etcd01" ETCD_DATA_DIR="/var/lib/etcd/default.etcd" ETCD_LISTEN_PEER_URLS="https://192.168.56.10:2380" ETCD_LISTEN_CLIENT_URLS="https://192.168.56.10:2379" #[Clustering] ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.56.10:2380" ETCD_ADVERTISE_CLIENT_URLS="https://192.168.56.10:2379" ETCD_INITIAL_CLUSTER="etcd01=https://192.168.56.10:2380,etcd02=https://192.168.56.20:2380,etcd03=https://192.168.56.30:2380" ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" ETCD_INITIAL_CLUSTER_STATE="new" ETCD_HEARTBEAT_INTERVAL=6000 ETCD_ELECTION_TIMEOUT=30000
创建系统服务文件
[root@master1 software]# more /usr/lib/systemd/system/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 ExecStart=/opt/etcd/bin/etcd \ --name=${ETCD_NAME} \ --data-dir=${ETCD_DATA_DIR} \ --listen-peer-urls=${ETCD_LISTEN_PEER_URLS} \ --listen-client-urls=${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \ --advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS} \ --initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS} \ --initial-cluster=${ETCD_INITIAL_CLUSTER} \ --initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN} \ --initial-cluster-state=new \ --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
分发证书，及etcd程序文件至其他master节点，注意（目录应相同），如有防火墙，请注意开启相应端口
启动etcd，并设置开启启动
[root@master1 ~]# systemctl start etcd
[root@master1 ~]# systemctl enable etcd
三节点全部开启后检查服务状态
[root@master1 ~]# /opt/etcd/bin/etcdctl --ca-file=/opt/etcd/ssl/ca.pem --cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.56.10:2379,https://192.168.56.20:2379,https://192.168.56.30:2379" cluster-health member 7a3a42e9f89c112c is healthy: got healthy result from https://192.168.56.30:2379 member 9db0cb3ea76b9cc6 is healthy: got healthy result from https://192.168.56.20:2379 member f0e4577804b51494 is healthy: got healthy result from https://192.168.56.10:2379 cluster is healthy
