keepalived high

cwx

　　#

　　#keepalived 官网
　　#keepalived 中文文档
　　#keepalived 下载
　　#
　　#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 {
     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
[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 {
     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
[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:  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:  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:  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:  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