环境准备:
两台安装了keepalived的服务器
ip:192.168.134.170;192.168.134.172
1、安装http服务
yum install httpd -y
2、写一个测试页面
[root@localhost ~]# echo "`hostname -I`,web1 test page. " > /var/www/html/inde
[root@localhost ~]# systemctl start httpd
3、修改keepalived配置文件(/etc/keepalived/keepalived.conf)
主节点
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL1
}
vrrp_instance VI_1 {
state MASTER
# nopreempt
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.134.100
}
}
备节点:修改优先级和state即可
4、结果
但是此时如果出现了web服务器故障,没有办法进行自动切换。
5、写检查脚本文章来源:https://www.toymoban.com/news/detail-647822.html
#!/bin/bash
while true
do
http_pid_num=`ps -C httpd --no-header | wc -l`
if [ $http_pid_num -eq 0 ]
then
systemctl start httpd
sleep 2
http_pid_num=`ps -C httpd --no-header | wc -l`
if [ $http_pid_num -eq 0 ]
then
systemctl stop keepalived
fi
fi
done
6、添加运行(放到后台)==>执行完此步骤后重新启动,再次测试,便可以进行故障切换。文章来源地址https://www.toymoban.com/news/detail-647822.html
nohup ./check_httpd.sh > nohup.out 2>&1 &
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