I. keepalived 说明

VIP:172.16.99.34

IP:172.16.99.32

IP: 172.16.99.33

  http:// 172.16.99.32:80

 http:// 172.16.99.32:80

http:// 172.16.99.34:80/

II.安装keepalived

# cd /app/soft # tar -zxvf keepalived-1.2.18.tar.gz  # cd keepalived-1.2.18  # ./configure --prefix=/app/soft/keepalived  # make && make install

默认目录是/app/soft
mkdir /etc/keepalived 
 cp /app/soft/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ 
复制到默认路径:
cp /app/soft/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /app/soft/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /app/soft/keepalived/sbin/keepalived /sbin/  
cp /app/soft/keepalived/sbin/keepalived  /usr/sbin/
chkconfig keepalived on 

配置:172.16.99.32

# vi /etc/keepalived/keepalived.conf 
! Configuration File for keepalived

global_defs {
router_id master #节点ID
}

vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh" #检查nginx状态的脚步路径
interval 2 #检测时间间隔
weight -20 #如果条件成立权重-20
}





vrrp_instance VI_1 {
state MASTER
interface eno16777736 # ifconfig 查看IP对应的网卡
virtual_router_id 51
mcast_src_ip 172.16.99.32 #localIP
priority 200 #权重
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}

track_script {
chk_nginx #执行nginx监控的服务
}

virtual_ipaddress {
172.16.99.34#vip #虚拟IP
}
}

配置监控 172.16.99.32

# vi /etc/keepalived/nginx_check.sh 
#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
killall keepalived
fi

配置:172.16.99.33

# vi /etc/keepalived/keepalived.conf 

! Configuration File for keepalived

global_defs {
router_id slave1
}
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh"
interval 2
weight -20
}

vrrp_instance VI_1 {
state BACKUP
interface eno16777736
virtual_router_id 51
mcast_src_ip 172.16.1.33
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}

track_script {
chk_nginx
}

virtual_ipaddress {
172.16.99.34
}
}

配置监控 172.16.99.33

# vi /etc/keepalived/nginx_check.sh 
#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
killall keepalived
fi

授权
# chmod +x /etc/keepalived/nginx_check.sh 

启动keepalived

# service keepalived start 
Starting keepalived (via systemctl):                       [  确定  ]

III.测试

1.同时启动两台服务器，测试keepalive master主服务器是否拥有VIP虚拟IP:
预期结果：
a.主master服务器拥有VIP
b.能够通过VIP访问相应的nginx及下面相应的文件；
2.关闭keepalive master 主服务器的nginx ,查询是否会通过脚本关闭keepalive并释放VIP
预期结果：
a.nginx关闭，keepalive根据脚本自动关闭，通过相对于端口也无法访问；
3.启动 keepalive master 主服务器，查询VIP的拥有情况
预期结果：
a.master 主服务器抢占VIP,因为权重的配置比BACKUP的大
4.同时关闭两台服务器的nginx，测试访问情况；
预期结果：
a.相应的端口关闭，keepalive主动关闭，相对应的访问项目不了