keeplived 安裝配置 centos-7.6

1. 安裝keeplived

yum安裝
yum -y install keepalived
源碼包下載地址
https://src.fedoraproject.org/repo/pkgs/keepalived/
可自行選擇版本，本次使用yum安裝

2. 配置對應配置文件

主節點配置

[root@ol13 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
   notification_email {
    *@*.com       #郵件報警及相關配置
   }
   notification_email_from noreply@hxshop.com
   smtp_server smtp.qq.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_http_port {
                script "/etc/keepalived/check_haproxy.sh"   #檢測ha是否存活的腳本
                interval 2
                weight 2
        	fall 2		
                rise 1
}
vrrp_instance VI_1 {
    state MASTER  #標識爲主
    interface eth0 #綁定網卡
    virtual_router_id 55 #主備節點應一致
    priority 110       #優先級主節點應高於備節點
    advert_int 1
    authentication {   #驗證信息主備節點應一致
        auth_type PASS   
        auth_pass 123456 
    }
track_script { 
        chk_http_port    #測試腳本 在上文中定義
        }
    virtual_ipaddress {
       172.16.0.248/24 dev eth0 label eth0:0  #綁定的對應Ip
    }
}

備節點配置

[root@ol23 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
   notification_email {
*@*.com
   }
   notification_email_from noreply@hxshop.com
   smtp_server smtp.qq.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_http_port {
                script "/etc/keepalived/check_haproxy.sh"
                interval 2
                weight 2
        	fall 2		
                rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0          #對應網卡設備名
    virtual_router_id 55    #與主節點相同
    priority 90             #低於主節點
    advert_int 1
    #nopreempt
    authentication {
        auth_type PASS
        auth_pass 123456 
    }
track_script { 
        chk_http_port 
        }
    virtual_ipaddress {
       172.16.0.248/24 dev eth0 label eth0:0
    }
}

3.測試腳本內容

[root@ol13 ~]# cat /etc/keepalived/check_haproxy.sh 
#!/bin/bash
A=`ps -C haproxy --no-header |wc -l`
if [ $A -eq 0  ];then
    systemctl start haproxy
#   /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.cfg
    echo "`date`:HaProxy start" >> /etc/keepalived/check_ha.log
fi
sleep 2 
if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then
	systemctl stop keepalived
     #   /etc/init.d/keepalived stop
         echo "`date`:keepalived stop" >> /etc/keepalived/check_ha.log
fi

測試腳本在主備節點均存在
須要加上執行權限
[root@ol13 ~]# chmod +x /etc/keepalived/check_haproxy.sh

4.調試命令

查看日誌
[root@ol23 ~]# journalctl -u keepalived
開啓防火牆 注意修改對應網卡設備名

firewall-cmd --direct --permanent --add-rule ipv4 filter INPUT 0 --in-interface ens33 --destination 224.0.0.18 --protocol vrrp -j ACCEPT
firewall-cmd --reload

5.啓動服務

主備同時
systemctl start keepalived
驗證
ip a

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:fb:5c:5f brd ff:ff:ff:ff:ff:ff
    inet 172.16.0.13/24 brd 172.16.0.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet 172.16.0.248/24 scope global secondary eth0:0
       valid_lft forever preferred_lft forever

會出現多個ip