K8S集群安裝 之 安裝主控節點etcd服務

一、在根證書服務器上創建基于根證書的config配置文件

200 certs]# cd /opt/certs/
200 certs]# vi /opt/certs/ca-config.json

{
    "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"
                ]
            }
        }
    }
}

二、創建etcd自簽證書簽名請求csr的json配置文件

200 certs]# vi etcd-peer-csr.json
{
    "CN": "k8s-etcd",
    "hosts": [
        "10.3.153.212",
        "10.3.153.221",
        "10.3.153.222"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}
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@test-operator certs]# ll | grep etcd-peer
-rw-r--r-- 1 root root 1062 Feb  1 00:19 etcd-peer.csr
-rw-r--r-- 1 root root  375 Feb  1 00:15 etcd-peer-csr.json
-rw------- 1 root root 1675 Feb  1 00:19 etcd-peer-key.pem    #證書私鑰
-rw-r--r-- 1 root root 1428 Feb  1 00:19 etcd-peer.pem            #證書文件

三、分別在三臺主機上安裝etcd服務

# 212/221/222機器：
~]# mkdir /opt/src
~]# cd /opt/src/
src]# useradd -s /sbin/nologin -M etcd
src]# id etcd
# 到GitHub下載或者直接用我給得安裝包 https://github.com/etcd-io/etcd/tags
src]# tar xf etcd-v3.1.20-linux-amd64.tar.gz -C /opt
opt]# mv etcd-v3.1.20-linux-amd64/ etcd-v3.1.20
opt]# ln -s /opt/etcd-v3.1.20/ /opt/etcd
opt]# cd etcd
~~~

~~~
# 212/221/222機器：
etcd]# mkdir -p /opt/etcd/certs /data/etcd /data/logs/etcd-server
etcd]# cd certs/
certs]# scp 10.3.153.200:/opt/certs/ca.pem .
# 輸入200虛機密碼
certs]# scp 10.3.153.200:/opt/certs/etcd-peer.pem .
certs]# scp 10.3.153.200:/opt/certs/etcd-peer-key.pem .
certs]# cd ..
etcd]# vi /opt/etcd/etcd-server-startup.sh
# 注意，如果是21機器，這下面得12都得改成21，initial-cluster則是全部機器都有，不需要改，一共5處
#!/bin/sh
./etcd --name etcd-server-7-12 \
       --data-dir /data/etcd/etcd-server \
       --listen-peer-urls https://10.3.153.212:2380 \
       --listen-client-urls https://10.3.153.212:2379,http://127.0.0.1:2379 \
       --quota-backend-bytes 8000000000 \
       --initial-advertise-peer-urls https://10.3.153.212:2380 \
       --advertise-client-urls https://10.4.7.12:2379,http://127.0.0.1:2379 \
       --initial-cluster  etcd-server-7-12=https://10.3.153.212:2380,etcd-server-7-21=https://10.3.153.221:2380,etcd-server-7-22=https://10.3.153.222:2380 \
       --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

etcd]# chmod +x etcd-server-startup.sh
etcd]# chown -R etcd.etcd /opt/etcd-v3.1.20/
etcd]# chown -R etcd.etcd /data/etcd/
etcd]# chown -R etcd.etcd /data/logs/etcd-server/
~~~

~~~
# 212/221/222機器：
etcd]# yum install supervisor -y        #用于把服務以后臺服務啟動
etcd]# systemctl start supervisord 
etcd]# systemctl enable supervisord
etcd]# vi /etc/supervisord.d/etcd-server.ini
# 注意修改下面得7-12，對應上機器，如21機器就是7-21，一共一處
[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=4                                        ; # 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)

12 etcd]# supervisorctl update
# out：etcd-server-7-21: added process group
12 etcd]# supervisorctl status
# out: etcd-server-7-12                 RUNNING   pid 16582, uptime 0:00:59
12 etcd]# netstat -luntp|grep etcd
# 必須是監聽了2379和2380這兩個端口才算成功
12 etcd]# etcd-server-7-12: added process group
~~~

~~~
# 任意節點檢測集群健康狀態的兩種方法
22 etcd]# ./etcdctl cluster-health
[root@test-nodes1 etcd]# ./etcdctl cluster-health
member 3657c30473e13ab3 is healthy: got healthy result from http://127.0.0.1:2379
member 6cbe98b6a135fd14 is healthy: got healthy result from http://127.0.0.1:2379
member b7ffbb00070336e7 is healthy: got healthy result from http://127.0.0.1:2379
cluster is healthy
22 etcd]# ./etcdctl member list
[root@test-nodes1 etcd]# ./etcdctl member list
3657c30473e13ab3: name=etcd-server-7-12 peerURLs=https://10.3.153.212:2380 clientURLs=http://127.0.0.1:2379,https://10.3.153.212:2379 isLeader=false
6cbe98b6a135fd14: name=etcd-server-7-21 peerURLs=https://10.3.153.221:2380 clientURLs=http://127.0.0.1:2379,https://10.3.153.221:2379 isLeader=false
b7ffbb00070336e7: name=etcd-server-7-22 peerURLs=https://10.3.153.222:2380 clientURLs=http://127.0.0.1:2379,https://10.3.153.222:2379 isLeader=true