IP | 主机名 | 节点类型 |
192.168.100.61 | server1 | master |
192.168.100.62 | server2 | backup |
建议关闭防火墙和selinux学习目标: 1.部署keepalived; 2.配置keepalived日志; 3.配置自定义监测httpd服务脚本;
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- keepalived+LVS搭建
一、安装keepalived和httpd(两个节点都需要执行)
[root@server1 ~]# yum -y install keepalived httpd
二、修改keepalived配置文件master节点:
[root@server1 ~]# vim /etc/keepalived/keepalived.conf
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_nginx { //设置健康检查脚本
script "/usr/local/sbin/chk_httpd.sh"
inverval 3 //3秒执行一次健康检查
}
vrrp_instance VI_1 {
state MASTER //节点名称
interface ens33 //用哪个网卡监听VIP (" Virtual IP ",即浮动IP)
//以实际情况修改,可能会不一样
//可以使用“ ip a ”命令查看自己所拥有的网卡名
virtual_router_id 51
priority 100 //节点的权重,值越大权重越大值最大的为master节点
//如果值变得比backup节点小就会变成backup节点,而backup节点就会升级成master节点
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.100.16 //自定义VIP
}
track_script {
chk_httpd //定义监控脚本,上面设置健康检查脚本的名称,需要和上面保持一致
}
}
backup节点:
[root@server2 ~]# vim /etc/keepalived/keepalived.conf
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "/usr/local/sbin/chk_httpd.sh"
inverval 3
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 90 //权重需要比master节点小
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.100.16
}
track_script {
chk_httpd
}
}
三、创建健康检查脚本并授执行权限 (以下两个节点都需要执行)
# vim /usr/local/sbin/chk_httpd.sh
#!/bin/bash
d=`date --date today +%Y%m%d_%H:%M:%S`
n=`netstat -lntp | grep httpd | wc -l`
if [ $n -eq 0 ]; then
systemctl start httpd
n2=`netstat -lntp | grep httpd | wc -l`
if [ $n2 -eq 0 ]; then
echo "$d httpd down,keepalived will stop" >> /var/log/check_ng.log
systemctl stop keepalived
fi
fi
授权
# chmod 755 /usr/local/sbin/chk_httpd.sh
四、设置日志系统(两个节点都设置,以便日后运维排错)
# vim /etc/sysconfig/keepalived
KEEPALIVED_OPTIONS="-D -d -S 0"
# vim /etc/rsyslog.conf
//找到此行
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
//在下面添加此行
local0.* /var/log/keepalived.log
五、重启rsyslog和keepalived生效配置(两个节点都执行)
# systemctl restart rsyslog
# systemctl restart keepalived
六、测试
关闭server1的keepalived,测试VIP是否会跳到backup节点
查看server2的网卡信息,查看VIP是否已经转到server2
查看两个主机的日志,可以看到刚刚主机的活动过程,这里使用“ tail -f [文件名] ”可实施查看日志的更新
配置告警系统(两个节点都配置邮件告警)
一、安装邮件服务
[root@server1 ~]# yum -y install mailx sendmail
修改邮件服务配置文件
[root@server1 ~]# vim /etc/mail.rc
##在配置文件中添加以下参数
set from=XXXXXXXX@qq.com //邮箱账号
set smtp=smtp.qq.com
set smtp-auth-user=XXXXXXX@qq.com //邮箱账号
set smtp-auth-password=XXXXXXXXXXX //邮箱smtp验证码
set smtp-auth=login
二、编写邮件通知脚本
[root@server1 ~]# vim /etc/keepalived/notify.sh
#!/bin/bash
contact='123456789@qq.com'
notify() {
mailsubject="$(hostname) to be $1 ,vip转移"
mailbody="$(date +'%F %T'): vrrp trasition, $(hostname) change to be $1"
echo " $mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage: $(basename $0) {master|backup|fault}"
ecit 1
;;
esac
三、开启触发动作
[root@server1 ~]# vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.100.16
}
track_script {
chk_httpd
}
##添加以下参数
notify_master "/bin/bash /etc/keepalived/notify.sh master" //当此节点成为master的时候执行后面的动作
notify_backup "/bin/bash /etc/keepalived/notify.sh backup" //当此节点成为backup的时候执行后面的动作
notify_fault "/bin/bash /etc/keepalived/notify.sh fault" //当此节点状态报错的时候执行后面的动作
}
四、测试 关闭server节点的keepalived
[root@server1 ~]# systemctl stop keepalived
qq邮箱收到邮件,提示server2已经成为新的节点