1、集群相关

2、keepalived相关

3、用keepalived配置高可用集群

安装：yum install keepalived -y

 

高可用，主要是针对于服务器硬件或服务器上的应用服务而言的，在软件方面就得根据自己的需要而定，这里就针对于nginx服务进行设置

两台电脑都安装上nginx服务

修改keepalived 的配制文件：

vim /etc/keepalived/keepalived.conf

加入：

global_defs {

notification_email {

aming@aminglinux.com

}

notification_email_from root@aminglinux.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script chk_nginx {

script "/usr/local/sbin/check_ng.sh"

interval 3

}

vrrp_instance VI_1 {

state MASTER

interface ens33

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass aminglinux>com

}

virtual_ipaddress {

192.168.188.100

}

track_script {

chk_nginx

}

}

编辑执行脚本文件：

vim /usr/local/sbin/check_ng.sh

加入：

#!/bin/bash

#时间变量，用于记录日志

d=`date --date today +%Y%m%d_%H:%M:%S`

#计算nginx进程数量

n=`ps -C nginx --no-heading|wc -l`

#如果进程为0，则启动nginx，并且再次检测nginx进程数量，

#如果还为0，说明nginx无法启动，此时需要关闭keepalived

if [ $n -eq "0" ]; then

/etc/init.d/nginx start

n2=`ps -C nginx --no-heading|wc -l`

if [ $n2 -eq "0" ]; then

echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log

systemctl stop keepalived

fi

fi

改变脚本权限：

chmod 755  /usr/local/sbin/check_ng.sh  (增加可执行权限)

然后启动keepalived服务：

systemctl start keepalived 或 service keepalived start

进行查看：ps aux |greep keepalive

查看VIP：

进行测试：

这样子，主的keepalived就设置好了。

配制重服务器keepalived

安装:yum install keepalived -y

修改配制文件：vim /etc/keepalived/keepalived.conf

加入：

global_defs {

notification_email {

aming@aminglinux.com

}

notification_email_from root@aminglinux.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script chk_nginx {

script "/usr/local/sbin/check_ng.sh"

interval 3

}

vrrp_instance VI_1 {

state BACKUP

interface ens33

virtual_router_id 51

priority 90

advert_int 1

authentication {

auth_type PASS

auth_pass aminglinux>com

}

virtual_ipaddress {

192.168.188.100

}

track_script {

chk_nginx

}

}

 

配制检测nginx的脚本：vim /usr/local/sbin/check_ng.sh

加入：

#时间变量，用于记录日志

d=`date --date today +%Y%m%d_%H:%M:%S`

#计算nginx进程数量

n=`ps -C nginx --no-heading|wc -l`

#如果进程为0，则启动nginx，并且再次检测nginx进程数量，

#如果还为0，说明nginx无法启动，此时需要关闭keepalived

if [ $n -eq "0" ]; then

systemctl start nginx      (根据自己的具体情况进行配制相关的服务)

n2=`ps -C nginx --no-heading|wc -l`

if [ $n2 -eq "0" ]; then

echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log

systemctl stop keepalived

fi

fi

增加执行权限：chmod 755  /usr/local/sbin/check_ng.sh

启动keepalived: systemctl start keepalived

查看：ps aux |grep keepalived

 由于都是外网机器，所以这里暂时无法测试。