keepalived學習筆記

使用keepalived實現haproxy高可用

環境：ubuntu16.04

兩臺服務器：192.168.199.200,192.168.199.201

VIP：192.168.199.123

兩臺機器都執行以下命令

1.安裝keepalived

# 修改網絡配置，添加
$ sudo vi /etc/sysctl.conf
...
net.ipv4.ip_forward=1
net.ipv4.ip_nonlocal_bind=1
...

# 網絡配置生效
$ sudo sysctl -p

# 安裝依賴及keepalived（24版本會出問題，19的沒有問題）
$ sudo apt install libssl-dev openssl libpopt-dev
$ sudo apt install keepalived=1:1.2.19-1

2.配置keepalived.conf

$ sudo vi /etc/keepalived/keepalived.conf

global_defs {
   router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
        script "/home/test/chk.sh"
        interval 2
}
vrrp_instance VI_1 {
      state BACKUP
      nopreempt
      interface enp0s31f6
      track_interface {
         lo
      }
      virtual_router_id 51
      priority 200
      advert_int 1
      authentication {
        auth_type PASS
        auth_pass 1111
      }
      virtual_ipaddress {
            192.168.199.123
      }
      track_script {
        chk_haproxy
      }
}

3.編輯檢測腳本

$ sudo vi ~/chk.sh

#!/bin/bash
if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then
        echo "yes"
        /etc/init.d/haproxy restart
fi

4.啓動keepalived

$ sudo systemctl restart keepalived

# 查看是否成功,若成功應該有四個進程
$ ps -ef | grep keepalived

# 查看虛擬IP是否綁定到物理網卡上
$ ip a

# 查看keepalived系統日誌
$ cat /var/log/syslog | grep Keepalived

參考資料：

1.http://www.cnblogs.com/guoximing/p/9390269.html

2.https://www.cnblogs.com/phpstudy2015-6/p/6706465.html#_label7

3.https://blog.csdn.net/huoyuanshen/article/details/68483188

4.https://blog.csdn.net/qq_27078095/article/details/53868603?locationNum=6&fps=1

5.https://www.cnblogs.com/ivictor/p/5522383.html