nginx +keepalived 高可用

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#nginx #keepalived #高可用

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本文详细介绍了如何在CentOS上安装配置Nginx和Keepalived，实现高可用性的负载均衡集群。包括Nginx的安装、开机启动、服务启动；Keepalived的安装、设置为主从节点、配置邮件通知、脚本监控等步骤。

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nginx 安装
------------------------------------------------------------------------
rpm -ivh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
yum install nginx

#设置开机启动
systemctl enable nginx.service

#启动服务
systemctl start nginx.service

-----------------------------------------------------------------------
keepalived 安装
#安装keepavlived
yum -y install keepalived

#设置开机启动
systemctl enable keepalived.service

#启动服务
service keepalived start

-----------------------------------------------------------------------
keepavlived mater设置

global_defs {
notification_email {
localhost@163.com
}
notification_email_from Keepalived@localhost
smtp_server 163@smtp.com
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "/etc/keepalived/chk_nginx.sh"
interval 3
weight 2
}

vrrp_instance VI_1 {
state MASTER
interface eth0
lvs_sync_daemon_interface eth0
virtual_router_id 151
priority 100
advert_int 5
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
#VIP
virtual_ipaddress {
172.16.101.193
}
track_script {
chk_nginx
}
}

------------------------------------------------------------------------
keepavlived backup 设置
cat keepalived.conf

vrrp_instance VI_1 {
state BACKUP
interface eth0
lvs_sync_daemon_interface eth0
virtual_router_id 151
priority 90
advert_int 5
authentication {
auth_type PASS
auth_pass 1111
}
#VIP
virtual_ipaddress {
172.16.101.193
}
track_script {
chk_nginx
}
}

-------------------------------------------------------------
脚本：
cat /etc/keepalived/chk_nginx.sh

#!/bin/sh
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then
   systemctl start nginx.service
   sleep 2
   if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
       systemctl stop keepalived
   fi
fi