一、签发etcd证书:

证书签发服务器 k8s-5-141:

创建ca的json配置: /opt/certs/ca-config.json
1. server 表示服务端连接客户端时携带的证书，用于客户端验证服务端身份
2. client 表示客户端连接服务端时携带的证书，用于服务端验证客户端身份
3. peer 表示相互之间连接时使用的证书，如etcd节点之间验证

"expiry": "175200h" 证书有效期十年如果这里是一年的话到期后集群会立宕掉

{
    "signing": {
        "default": {
            "expiry": "175200h"
        },
        "profiles": {
            "server": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth"
                ]
            },
            "client": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "client auth"
                ]
            },
            "peer": {
                "expiry": "175200h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth",
                    "client auth"
                ]
            }
        }
    }
}

创建etcd证书配置：/opt/certs/etcd-peer-csr.json

重点在hosts上，将所有可能的etcd服务器添加到host列表，不能使用网段，新增etcd服务器需要重新签发证书

{
    "CN": "batar-etcd",
    "hosts": [
            "127.0.0.1",
        "localhost",
        "192.168.5.137",
        "192.168.5.138",
        "192.168.5.139",
        "192.168.5.140"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "batar",
            "OU": "zhonggu"
        }
    ]
}

签发证书

[root@hdss7-200 ~]# cd /opt/certs/
[root@hdss7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=peer etcd-peer-csr.json |cfssl-json -bare etcd-peer
[root@hdss7-200 certs]# ll etcd-peer*
-rw-r--r-- 1 root root 1062 Jan  5 17:01 etcd-peer.csr
-rw-r--r-- 1 root root  363 Jan  5 16:59 etcd-peer-csr.json
-rw------- 1 root root 1675 Jan  5 17:01 etcd-peer-key.pem
-rw-r--r-- 1 root root 1428 Jan  5 17:01 etcd-peer.pem

开始安装 etcd

```bash

先在需要安装etcd的机子上创建 etcd 用户; k8s-5-137，k8s-5-138，k8s-5-139

useradd -s /sbin/nologin -M etcd

下载etcd

cd /opt/src/ wget https://github.com/etcd-io/etcd/releases/download/v3.4.3/etcd-v3.4.3-linux-amd64.tar.gz

tar -xf etcd-v3.1.20-linux-amd64.tar.gz

mv etcd-v3.1.20-linux-amd64 /opt/etcd-v3.1.20

ln -s /opt/etcd-v3.1.20 /opt/etcd

ll /opt/etcd

/opt/etcd -> /opt/etcd-v3.1.20

mkdir -p /opt/etcd/certs /data/etcd /data/logs/etcd-server

下发证书到各个etcd节点上(需要在 k8s-5-141上操作)
```bash
cd /opt/certs/
# 期间需要分别输入密码
for i in 137 138 139;do scp ca.pem etcd-peer.pem etcd-peer-key.pem k8s-5-${i}.host.com:/opt/etcd/certs/ ;done

创建启动脚本(在 etcd三个节点服务器上执行,部分参数需要根据节点的IP地址修改)

~]# vim /opt/etcd/etcd-server-startup.sh
#!/bin/sh
# listen-peer-urls etcd节点之间通信端口
# listen-client-urls 客户端与etcd通信端口
# quota-backend-bytes 配额大小
# 需要修改的参数：name,listen-peer-urls,listen-client-urls,initial-advertise-peer-urls
WORK_DIR=$(dirname $(readlink -f $0))
[ $? -eq 0 ] && cd $WORK_DIR || exit
/opt/etcd/etcd --name etcd-server-5-137 \
    --data-dir /data/etcd/etcd-server \
    --listen-peer-urls https://192.168.5.137:2380 \
    --listen-client-urls https://192.168.5.137:2379,http://127.0.0.1:2379 \
    --quota-backend-bytes 8000000000 \
    --initial-advertise-peer-urls https://192.168.5.137:2380 \
    --advertise-client-urls https://192.168.5.137:2379,http://127.0.0.1:2379 \
    --initial-cluster  etcd-server-5-137=https://192.168.5.137:2380,etcd-server-5-138=https://192.168.5.138:2380,etcd-server-5-139=https://192.168.5.139:2380 \
    --ca-file ./certs/ca.pem \
    --cert-file ./certs/etcd-peer.pem \
    --key-file ./certs/etcd-peer-key.pem \
    --client-cert-auth  \
    --trusted-ca-file ./certs/ca.pem \
    --peer-ca-file ./certs/ca.pem \
    --peer-cert-file ./certs/etcd-peer.pem \
    --peer-key-file ./certs/etcd-peer-key.pem \
    --peer-client-cert-auth \
    --peer-trusted-ca-file ./certs/ca.pem \
    --log-output stdout

修改执行权限和其他相关目录的属主/属组

~]# chmod u+x /opt/etcd/etcd-server-startup.sh
~]# chown -R etcd.etcd /opt/etcd/ /data/etcd /data/logs/etcd-server

启动etcd
因为这些进程都是要启动为后台进程，要么手动启动，要么采用后台进程管理工具，实验中使用后台管理工具

 ~]# yum install -y supervisor
 ~]# systemctl start supervisord ; systemctl enable supervisord
 ~]# vim /etc/supervisord.d/etcd-server.ini
[program:etcd-server-7-12]
command=/opt/etcd/etcd-server-startup.sh              ; the program (relative uses PATH, can take args)
numprocs=1                                            ; number of processes copies to start (def 1)
directory=/opt/etcd                                   ; directory to cwd to before exec (def no cwd)
autostart=true                                        ; start at supervisord start (default: true)
autorestart=true                                      ; retstart at unexpected quit (default: true)
startsecs=30                                          ; number of secs prog must stay running (def. 1)
startretries=3                                        ; max # of serial start failures (default 3)
exitcodes=0,2                                         ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                       ; signal used to kill process (default TERM)
stopwaitsecs=10                                       ; max num secs to wait b4 SIGKILL (default 10)
user=etcd                                             ; setuid to this UNIX account to run the program
redirect_stderr=true                                  ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/etcd-server/etcd.stdout.log ; stdout log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                          ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=5                              ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                           ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                           ; emit events on stdout writes (default false)
 ~]# supervisorctl update
etcd-server-7-12: added process group

运维

5. 安装etcd

一、签发etcd证书:

开始安装 etcd

先在需要安装etcd的机子上创建 etcd 用户; k8s-5-137，k8s-5-138，k8s-5-139

下载etcd