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32-4 keepalived（nginx架构）
配置环境：
1、停止keepalived
[root@node1 keepalived]# systemctl stop keepalived.service
[root@node2 keepalived]# systemctl stop keepalived.service
[root@rs1 ~]# bash setka.sh stop
[root@rs2 ~]# bash setka.sh stop
2、配置nginx
[root@node1 ~]# yum install nginx
[root@node2 ~]# yum install nginx
[root@node1 ~]# cd /etc/nginx/
[root@node1 nginx]# vim nginx.conf
在
include /etc/nginx/conf.d/*.conf;和server { 之间（约33行后）
添加
upstream websrvs {
server 192.168.1.62:80 weight=1;
server 192.168.1.72:80 weight=1;
}
修改
location / {
}
为
location / {
proxy_pass http://websrvs/;
}
[root@node1 nginx]# systemctl start nginx.service
[root@node1 nginx]# scp nginx.conf 192.168.1.74:/etc/nginx/
[root@node2 nginx]# systemctl start nginx.service
3、配置keepalived
[root@node1 keepalived]# vim keepalived.conf （两个结点作同样配置）
1）在vrrp_instance VI_1（约19行）前添加如下内容
vrrp_script chk_nginx {
script "killall -0 nginx &> /dev/null"
interval 1
weight -10
}
2）修改
track_script {
chk_mt
}
为
track_script {
chk_nginx
}
3）删除virtual_server段定义
[root@node1 keepalived]# systemctl start keepalived.service
[root@node2 keepalived]# systemctl start keepalived.service
4、测试keepalived
（1）关闭node1上的nginx服务
[root@node1 keepalived]# systemctl stop nginx
结果：
9月 04 08:40:32 node1 Keepalived_vrrp[49560]: VRRP_Script(chk_nginx) failed
9月 04 08:40:34 node1 Keepalived_vrrp[49560]: VRRP_Instance(VI_1) Received higher prio advert
9月 04 08:40:34 node1 Keepalived_vrrp[49560]: VRRP_Instance(VI_1) Entering BACKUP STATE
9月 04 08:40:34 node1 Keepalived_vrrp[49560]: VRRP_Instance(VI_1) removing protocol VIPs.
9月 04 08:40:34 node1 Keepalived_healthcheckers[49559]: Netlink reflector reports IP 192.168.1.80 removed
9月 04 08:40:34 node1 Keepalived_vrrp[49560]: Opening script file /etc/keepalived/notify.sh
脚本检测失败，node1节点从MASTER变成BACKUP，VIP节点被移除
附件文件
一、NODE1节点
keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from kaadmin@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_mcast_group4 224.0.0.18
}
vrrp_script chk_mt {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
inerval 1
weight -2
}
vrrp_script chk_nginx {
script "killall -0 nginx &> /dev/null"
interval 1
weight -10
}
vrrp_instance VI_1 {
state MASTER
interface eno16777736
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass aaf0d876679a
}
virtual_ipaddress {
192.168.1.80/16 dev eno16777736 label eno16777736:1
}
track_script {
chk_nginx
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_script chk_nginx {
script "killall -0 nginx &> /dev/null"
interval 1
weight -10
}
vrrp_instance VI_2 {
state BACKUP
interface eno16777736
virtual_router_id 133
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 5a806846279a
}
virtual_ipaddress {
192.168.1.180/16 dev eno16777736 label eno16777736:2
}
track_script {
chk_nginx
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}notify.sh
#!/bin/bash
# Author: MageEdu <linuxedu@foxmail.com>
# description: An example of notify script
#
vip=192.168.1.80
contact=‘root@localhost‘
notify() {
mailsubject="`hostname` to be $1: $vip floating"
mailbody="`date ‘+%F %H:%M:%S‘`: vrrp transition, `hostname` changed to be $1"
echo $mailbody | mail -s "$mailsubject" $contact
}
case "$1" in
master)
notify master
#systemctl restart nginx.serivce
exit 0
;;
backup)
notify backup
#systemctl restart nginx.serivce
exit 0
;;
fault)
notify fault
exit 0
;;
*)
echo ‘Usage: `basename $0` {master|backup|fault}‘
exit 1
;;
esac二、Node2
keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from kaadmin@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_mt {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
inerval 1
weight -2
}
vrrp_script chk_nginx {
script "killall -0 nginx &> /dev/null"
interval 1
weight -10
}
vrrp_instance VI_1 {
state BACKUP
interface eno16777736
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass aaf0d876679a
}
virtual_ipaddress {
192.168.1.80/16 dev eno16777736 label eno16777736:1
}
track_script {
chk_nginx
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance VI_2 {
state MASTER
interface eno16777736
virtual_router_id 133
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 5a806846279a
}
virtual_ipaddress {
192.168.1.180/16 dev eno16777736 label eno16777736:2
}
track_script {
chk_nginx
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}notify.sh
#!/bin/bash
# Author: MageEdu <linuxedu@foxmail.com>
# description: An example of notify script
#
vip=192.168.1.80
contact=‘root@localhost‘
notify() {
mailsubject="`hostname` to be $1: $vip floating"
mailbody="`date ‘+%F %H:%M:%S‘`: vrrp transition, `hostname` changed to be $1"
echo $mailbody | mail -s "$mailsubject" $contact
}
case "$1" in
master)
notify master
#systemctl restart nginx.serivce
exit 0
;;
backup)
notify backup
#systemctl restart nginx.serivce
exit 0
;;
fault)
notify fault
exit 0
;;
*)
echo ‘Usage: `basename $0` {master|backup|fault}‘
exit 1
;;
esac本文出自 “追梦” 博客，请务必保留此出处http://sihua.blog.51cto.com/377227/1846065
32-4 keepalived（nginx架构）