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

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[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

1 2	[root@Storage_1 ~]# wget   #同理

或者yum 安装 (系统镜像内有)

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

1	[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

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

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

#修改keepalived配置文件（Master节点）

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[root@Storage_1 ~]# vim /etc/keepalived/keepalived.conf [root@Storage_1 ~]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived   global_defs {    notification_email {      test@qq.com    }    notification_email_from Alexandre.Cassen@firewall.loc    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

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[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）

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[root@Storage_2 ~]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived   global_defs {    notification_email {      test@qq.com    }    notification_email_from Alexandre.Cassen@firewall.loc    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

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

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

#测试

#查看ip（vip出现在master上）

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[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 ~]#

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[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

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

#主上的vip不见了

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[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

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[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

本文转自 chaunceyjiang  51CTO博客，原文链接：http://blog.51cto.com/cqwujiang/1918990，如需转载请自行联系原作者