这篇文章为大家带来有关kubernetes中etcd组件的部署方法。文章涵盖etcd组件的简介和etcd组件的部署方法，希望大家通过这篇文章能有所收获。

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etcd组件部署

etcd简介

• etcd是CoreOS团队于2013年6月发起的开源项目，它的目标是构建一个高可用的分布式键值(key-value)数据库。etcd内部采用raft协议作为一致性算法，etcd基于Go语言实现。
• etcd作为服务发现系统，有以下的特点：
  • 简单：安装配置简单，而且提供了HTTP API进行交互，使用也很简单
  • 安全：支持SSL证书验证
  • 快速：根据官方提供的benchmark数据，单实例支持每秒2k+读操作
  • 可靠：采用raft算法，实现分布式系统数据的可用性和一致性

master01服务器操作

• 自签etcd组件证书

  [root@master01 ~]# systemctl stop firewalld.service   //关闭防火墙
  [root@master01 ~]# setenforce 0                       //关闭selinux
  [root@master01 ~]# mkdir k8s         //创建k8s目录
  [root@master01 ~]# ls
  anaconda-ks.cfg  k8s
  [root@master01 ~]# mount.cifs //192.168.80.2/shares/K8S/k8s01 /mnt/    //挂载宿主机中准备好的软件包
  Password for root@//192.168.80.2/shares/K8S/k8s01:
  [root@master01 ~]# cd /mnt/
  [root@master01 mnt]# ls
  etcd-cert     etcd-v3.3.10-linux-amd64.tar.gz     k8s-cert.sh                           master.zip
  etcd-cert.sh  flannel.sh                          kubeconfig.sh                         node.zip
  etcd.sh       flannel-v0.10.0-linux-amd64.tar.gz  kubernetes-server-linux-amd64.tar.gz
  [root@master01 mnt]# cd /root/k8s/             //回到k8s目录
  [root@master01 k8s]# vim cfssl.sh              //编辑脚本下载cfssl官方包  做ca认证的软件包
  curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
  curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
  curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
  chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo
  :wq
  [root@master01 k8s]# bash cfssl.sh             //执行脚本，下载cfssl官方包
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
  100  9.8M  100  9.8M    0     0   457k      0  0:00:22  0:00:22 --:--:--  581k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
  100 2224k  100 2224k    0     0   300k      0  0:00:07  0:00:07 --:--:--  517k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                               Dload  Upload   Total   Spent    Left  Speed
  100 6440k  100 6440k    0     0   276k      0  0:00:23  0:00:23 --:--:--  221k
  [root@master01 k8s]# ls /usr/local/bin/              //查看证书是否成功下载
  cfssl  cfssl-certinfo  cfssljson
  [root@master01 k8s]# mkdir etcd-cert           //创建证书存放目录
  [root@master01 k8s]# ls
  etcd-cert
  [root@master01 k8s]# cd etcd-cert/            //进入证书存放目录
  [root@master01 etcd-cert]# cat > ca-config.json < {
  >   "signing": {
  >     "default": {
  >       "expiry": "87600h"          //证书失效
  >     },
  >     "profiles": {
  >       "www": {
  >          "expiry": "87600h",
  >          "usages": [
  >             "signing",
  >             "key encipherment",
  >             "server auth",        //服务端验证
  >             "client auth"         //客户端验证
  >         ]
  >       }
  >     }
  >   }
  > }
  > EOF
  [root@master01 etcd-cert]# cat > ca-csr.json < {
  >     "CN": "etcd CA",
  >     "key": {
  >         "algo": "rsa",         //使用非对称密钥
  >         "size": 2048           //密钥长度
  >     },
  >     "names": [
  >         {
  >             "C": "CN",             //标识信息，可自行定义
  >             "L": "Beijing",
  >             "ST": "Beijing"
  >         }
  >     ]
  > }
  > EOF
  [root@master01 etcd-cert]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -     //使用命令生成ca证书
  2020/02/09 16:53:08 [INFO] generating a new CA key and certificate from CSR
  2020/02/09 16:53:08 [INFO] generate received request
  2020/02/09 16:53:08 [INFO] received CSR
  2020/02/09 16:53:08 [INFO] generating key: rsa-2048
  2020/02/09 16:53:08 [INFO] encoded CSR
  2020/02/09 16:53:08 [INFO] signed certificate with serial number 400787333165311350366024741004548366561538833100
  [root@master01 etcd-cert]# ls
  ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem    //ca证书生成成功
  [root@master01 etcd-cert]# cat > server-csr.json < {
  >     "CN": "etcd",
  >     "hosts": [
  >     "192.168.80.12",         //群集IP地址设定，master地址
  >     "192.168.80.13",         //node01IP地址
  >     "192.168.80.14"          //node02IP地址
  >     ],
  >     "key": {
  >         "algo": "rsa",
  >         "size": 2048
  >     },
  >     "names": [
  >         {
  >             "C": "CN",
  >             "L": "BeiJing",
  >             "ST": "BeiJing"
  >         }
  >     ]
  > }
  > EOF
  [root@master01 etcd-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server     //生成ETCD证书 server-key.pem   server.pem
  2020/02/09 16:59:12 [INFO] generate received request
  2020/02/09 16:59:12 [INFO] received CSR
  2020/02/09 16:59:12 [INFO] generating key: rsa-2048
  2020/02/09 16:59:12 [INFO] encoded CSR
  2020/02/09 16:59:12 [INFO] signed certificate with serial number 155295832576786241095177900248601469934260652049
  2020/02/09 16:59:12 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
  websites. For more information see the Baseline Requirements for the Issuance and Management
  of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
  specifically, section 10.2.3 ("Information Requirements").
  [root@master01 etcd-cert]# ls
  ca-config.json  ca-csr.json  ca.pem      server-csr.json  server.pem
  ca.csr          ca-key.pem   server.csr  server-key.pem                   //生成成功

• 部署etcd服务

  [root@master01 etcd-cert]# cd /mnt/           //进入宿主机挂载过来的目录
  [root@master01 mnt]# ls
  etcd-cert     etcd-v3.3.10-linux-amd64.tar.gz     k8s-cert.sh                           master.zip
  etcd-cert.sh  flannel.sh                          kubeconfig.sh                         node.zip
  etcd.sh       flannel-v0.10.0-linux-amd64.tar.gz  kubernetes-server-linux-amd64.tar.gz
  [root@master01 mnt]# cp etcd-v3.3.10-linux-amd64.tar.gz flannel-v0.10.0-linux-amd64.tar.gz kubernetes-server-linux-amd64.tar.gz etcd.sh /root/k8s/     //将软件包与etcd执行脚本复制到k8s工作目录中
  [root@master01 mnt]# cd /root/k8s/                   //回到k8s工作目录
  [root@master01 k8s]# tar zvxf etcd-v3.3.10-linux-amd64.tar.gz       //解压etcd软件包
  etcd-v3.3.10-linux-amd64/
  etcd-v3.3.10-linux-amd64/Documentation/
  etcd-v3.3.10-linux-amd64/Documentation/platforms/
  etcd-v3.3.10-linux-amd64/Documentation/platforms/container-linux-systemd.md
  etcd-v3.3.10-linux-amd64/Documentation/platforms/aws.md
  etcd-v3.3.10-linux-amd64/Documentation/platforms/freebsd.md
  etcd-v3.3.10-linux-amd64/Documentation/rfc/
  ...
  [root@master01 k8s]# mkdir /opt/etcd/{cfg,bin,ssl} -p    //递归创建etcd工作目录
  [root@master01 k8s]# mv etcd-v3.3.10-linux-amd64/etcd etcd-v3.3.10-linux-amd64/etcdctl /opt/etcd/bin/   //将etcd命令文件复制到工作目录中bin目录下
  [root@master01 k8s]# ls /opt/etcd/bin/      //查看
  etcd  etcdctl
  [root@master01 k8s]# cp etcd-cert/*.pem /opt/etcd/ssl/    //拷贝证书文件到etcd工作目录ssl目录下
  [root@master01 k8s]# ls /opt/etcd/ssl/         //查看
  ca-key.pem  ca.pem  server-key.pem  server.pem
  [root@master01 k8s]# bash etcd.sh etcd01 192.168.80.12 etcd02=https://192.168.80.13:2380,etcd03=https://192.168.80.14:2380    //执行启动脚本 etcd01为master01服务器地址 etcd02、etcd03为node01、node02IP地址，稍后我们将分别在node01、node02中部署etcd，组成etcd群集，脚本执行同时生成etcd配置文件
  Created symlink from /etc/systemd/system/multi-user.target.wants/etcd.service to /usr/lib/systemd/system/etcd.service.
  //执行启动脚本后会进入卡住状态，等待其他节点加入，它也有一定的超时时间，超过超时时间会出现报错，不用理会

• 重新开启新的会话框

  [root@master01 ~]# ps -ef | grep etcd    //查看进程是否开启
  root      16146      1  0 17:14 ?        00:00:00 /opt/etcd/bin/etcd --name=etcd01 --data-dir=/var/lib/etcd/default.etcd --listen-peer-urls=https://192.168.80.12:2380 --listen-client-urls=https://192.168.80.12:2379,http://127.0.0.1:2379 --advertise-client-urls=https://192.168.80.12:2379 --initial-advertise-peer-urls=https://192.168.80.12:2380 --initial-cluster=etcd01=https://192.168.80.12:2380,etcd02=https://192.168.80.13:2380,etcd03=https://192.168.80.14:2380 --initial-cluster-token=etcd-cluster --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
  root      16191  16160  0 17:15 pts/1    00:00:00 grep --color=auto etcd    //成功开启
  [root@master01 ~]# scp -r /opt/etcd/ root@192.168.80.13:/opt/           //拷贝etcd工作目录到node01节点
  The authenticity of host '192.168.80.13 (192.168.80.13)' can't be established.
  ECDSA key fingerprint is SHA256:Ih0NpZxfLb+MOEFW8B+ZsQ5R8Il2Sx8dlNov632cFlo.
  ECDSA key fingerprint is MD5:a9:ee:e5:cc:40:c7:9e:24:5b:c1:cd:c1:7b:31:42:0f.
  Are you sure you want to continue connecting (yes/no)? yes
  Warning: Permanently added '192.168.80.13' (ECDSA) to the list of known hosts.
  root@192.168.80.13's password:
  etcd                                                                       100%  509   495.7KB/s   00:00
  etcd                                                                       100%   18MB  98.7MB/s   00:00
  etcdctl                                                                    100%   15MB  95.0MB/s   00:00
  ca-key.pem                                                                 100% 1675     1.6MB/s   00:00
  ca.pem                                                                     100% 1265   416.6KB/s   00:00
  server-key.pem                                                             100% 1675     2.3MB/s   00:00
  server.pem                                                                 100% 1338     2.0MB/s   00:00
  [root@master01 ~]# scp -r /opt/etcd/ root@192.168.80.14:/opt/         //拷贝etcd工作目录到node02节点
  The authenticity of host '192.168.80.14 (192.168.80.14)' can't be established.
  ECDSA key fingerprint is SHA256:Ih0NpZxfLb+MOEFW8B+ZsQ5R8Il2Sx8dlNov632cFlo.
  ECDSA key fingerprint is MD5:a9:ee:e5:cc:40:c7:9e:24:5b:c1:cd:c1:7b:31:42:0f.
  Are you sure you want to continue connecting (yes/no)? yes
  Warning: Permanently added '192.168.80.14' (ECDSA) to the list of known hosts.
  root@192.168.80.14's password:
  etcd                                                                       100%  509   523.8KB/s   00:00
  etcd                                                                       100%   18MB  79.6MB/s   00:00
  etcdctl                                                                    100%   15MB 140.4MB/s   00:00
  ca-key.pem                                                                 100% 1675     1.9MB/s   00:00
  ca.pem                                                                     100% 1265   296.4KB/s   00:00
  server-key.pem                                                             100% 1675     2.4MB/s   00:00
  server.pem                                                                 100% 1338   423.3KB/s   00:00
  [root@master01 ~]# scp /usr/lib/systemd/system/etcd.service root@192.168.80.13:/usr/lib/systemd/system/               //启动脚本拷贝到node01节点
  root@192.168.80.13's password:
  etcd.service                                                               100%  923   628.8KB/s   00:00
  [root@master01 ~]# scp /usr/lib/systemd/system/etcd.service root@192.168.80.14:/usr/lib/systemd/system/               //启动脚本拷贝到node02节点
  root@192.168.80.14's password:
  etcd.service                                                               100%  923   684.8KB/s   00:00

  node01服务器操作

• 更改复制过来的etcd配置文件

  [root@node01 ~]# systemctl stop firewalld.service       //关闭防火墙
  [root@node01 ~]# setenforce 0                           //关闭selinux
  [root@node01 ~]# vim /opt/etcd/cfg/etcd
  #[Member] 
  ETCD_NAME="etcd02"                 //更改名称为etcd02
  ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
  ETCD_LISTEN_PEER_URLS="https://192.168.80.13:2380"    //更改IP地址为192.168.80.13
  ETCD_LISTEN_CLIENT_URLS="https://192.168.80.13:2379"  //更改IP地址为192.168.80.13
  
  #[Clustering]
  ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.80.13:2380"   //更改IP地址为192.168.80.13
  ETCD_ADVERTISE_CLIENT_URLS="https://192.168.80.13:2379"         //更改IP地址为192.168.80.13
  ETCD_INITIAL_CLUSTER="etcd01=https://192.168.80.12:2380,etcd02=https://192.168.80.13:2380,etcd03=https://192.168.80.14:2380"                           //注意：此处不用改动
  ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
  ETCD_INITIAL_CLUSTER_STATE="new"
  :wq 
  [root@node01 ~]# systemctl start etcd             //编辑完成后直接启动etcd服务
  [root@node01 ~]# systemctl status etcd            //查看服务状态
  ● etcd.service - Etcd Server
  Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
  Active: active (running) since 日 2020-02-09 17:25:38 CST; 50s ago    //正常运行
  Main PID: 15905 (etcd)
  ...

  node02服务器操作

• 更改复制过来的etcd配置文件

  [root@node02 ~]# systemctl stop firewalld.service        //关闭防火墙
  [root@node02 ~]# setenforce 0                           //关闭selinux
  [root@node02 ~]# vim /opt/etcd/cfg/etcd
  #[Member]
  ETCD_NAME="etcd03"                                     //更改名称为etcd03
  ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
  ETCD_LISTEN_PEER_URLS="https://192.168.80.14:2380"     //更改IP地址为192.168.80.14
  ETCD_LISTEN_CLIENT_URLS="https://192.168.80.14:2379"   //更改IP地址为192.168.80.14
  
  #[Clustering]
  ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.80.14:2380"      //更改IP地址为192.168.80.14
  ETCD_ADVERTISE_CLIENT_URLS="https://192.168.80.14:2379"            //更改IP地址为192.168.80.14
  ETCD_INITIAL_CLUSTER="etcd01=https://192.168.80.12:2380,etcd02=https://192.168.80.13:2380,etcd03=https://192.168.80.14:2380"             //注意：此处不用改动
  ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
  ETCD_INITIAL_CLUSTER_STATE="new"
  :wq
  [root@node02 ~]# systemctl start etcd        //启动服务
  [root@node02 ~]# systemctl status etcd       //查看状态
  ● etcd.service - Etcd Server
  Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
  Active: active (running) since 日 2020-02-09 17:32:29 CST; 4s ago   //成功运行
  Main PID: 15926 (etcd)
  ...

  回到master01服务器操作

检查群集状态

[root@master01 k8s]# cd etcd-cert/      //进入证书目录 因为要使用ca证书验证查看，所有要进入证书存放目录中查看
[root@master01 etcd-cert]# /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem --endpoints="https://192.168.80.12:2379,https://192.168.80.13:2379,https://192.168.80.14:2379" cluster-health        //使用目录查看群集状态
member accc4008f61328 is healthy: got healthy result from https://192.168.80.13:2379
member 88ef2b8e883800a0 is healthy: got healthy result from https://192.168.80.12:2379
member fafd8a15257570ee is healthy: got healthy result from https://192.168.80.14:2379
cluster is healthy        //群集创建成功

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本文题目：kubernetesetcd组件部署
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