keepalived high-availability

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#keepalived 官网

#keepalived 中文文档

#keepalived 下载

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#逻辑图

主机名	keeoalived角色	ip地址
Storage_1	Master	192.168.174.137  Vip:192.168.174.100
Storage_2	Backup	192.168.174.138

#均关闭防火墙和selinux

下载软件 编译安装

[root@Storage_2 ~]# wget http://www.keepalived.org/software/keepalived-1.3.5.tar.gz
[root@Storage_2 ~]#tar -xf keepalived-1.3.5.tar.gz
[root@Storage_2 ~]#cd keepalived-1.3.5
[root@Storage_2 keepalived-1.3.5]# ./configure --prefix=/usr/local/keepalived
[root@Storage_2 keepalived-1.3.5]# make && make install

[root@Storage_1 ~]# wget 
 #同理

或者yum 安装 (系统镜像内有)

[root@Storage_1 ~]# yum install -y keepalived

[root@Storage_2 ~]# yum install -y keepalived

本文采用的是yum安装

nginx安装

#前面的文章已经安装过很多次了，这里就不再重复

#开启nginx

[root@Storage_1 ~]# /usr/local/nginx/sbin/nginx

[root@Storage_2 ~]# /usr/local/nginx/sbin/nginx

#修改keepalived配置文件（Master节点）

[root@Storage_1 ~]# vim /etc/keepalived/keepalived.conf
[root@Storage_1 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 127.0.01
   smtp_connect_timeout 30
   router_id Stroage_1
}
vrrp_script chk_nginx {    #脚本
script "/opt/chk_nginx_status.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
    state MASTER
    interface eno16777736
    virtual_router_id 51
    priority 150           #优先级
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.174.100/24
    }
    track_script {
	chk_nginx
}
}

编写检查nginx状态的脚本

[root@Storage_1 ~]# vim /opt/chk_nginx_status.sh
[root@Storage_1 ~]# cat /opt/chk_nginx_status.sh 
#!/bin/bash
if [ `netstat -lntup | grep "nginx: master" |wc -l` -eq 0 ]
then
systemctl stop keepalived         #如果nginx挂掉,就关闭keepalived
fi

[root@Storage_1 ~]# chmod +x /opt/chk_nginx_status.sh

#修改keepalived配置文件（Backup节点）

[root@Storage_2 ~]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 127.0.01
   smtp_connect_timeout 30
   router_id Stroage_2       #在同一个局域网内唯一
}
vrrp_instance VI_1 {               #实例名称
    state BACKUP             #角色
    interface eno16777736    #接口
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.174.100/24    #vip
    }
}

#开启服务

[root@Storage_1 ~]# systemctl start keepalived.service

[root@Storage_2 ~]# systemctl start keepalived.service

#测试

#查看ip（vip出现在master上）

[root@Storage_1 ~]# ip addr show eno16777736 
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:87:00:97 brd ff:ff:ff:ff:ff:ff
    inet 192.168.174.137/24 brd 192.168.174.255 scope global dynamic eno16777736
       valid_lft 1684sec preferred_lft 1684sec
    inet 192.168.174.100/24 scope global eno16777736
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe87:97/64 scope link 
       valid_lft forever preferred_lft forever
[root@Storage_1 ~]#

[root@Storage_2 ~]# ip addr show eno16777736 
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:78:f4:d9 brd ff:ff:ff:ff:ff:ff
    inet 192.168.174.138/24 brd 192.168.174.255 scope global dynamic eno16777736
       valid_lft 1595sec preferred_lft 1595sec
    inet6 fe80::20c:29ff:fe78:f4d9/64 scope link 
       valid_lft forever preferred_lft forever
[root@Storage_2 ~]#

#测试

#关闭主上的nginx

[root@Storage_1 ~]# /usr/local/nginx/sbin/nginx -s quit

#主上的vip不见了

[root@Storage_1 ~]# ip addr show eno16777736 
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:87:00:97 brd ff:ff:ff:ff:ff:ff
    inet 192.168.174.137/24 brd 192.168.174.255 scope global dynamic eno16777736
       valid_lft 1326sec preferred_lft 1326sec
    inet6 fe80::20c:29ff:fe87:97/64 scope link 
       valid_lft forever preferred_lft forever

#备上出现了vip

[root@Storage_2 ~]# ip addr show eno16777736 
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:78:f4:d9 brd ff:ff:ff:ff:ff:ff
    inet 192.168.174.138/24 brd 192.168.174.255 scope global dynamic eno16777736
       valid_lft 1397sec preferred_lft 1397sec
    inet 192.168.174.100/24 scope global secondary eno16777736
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe78:f4d9/64 scope link 
       valid_lft forever preferred_lft forever

#访问测试

#vip成功漂移