keepalived + nginx双主 实战

安装nginx

nginx 下载地址 http://nginx.org/download/nginx-1.8.0.tar.gz

安装nginx的依赖关系

yum install pcre pcre-devel openssl openssl-devel -y

创建用户  useradd www

接下来编译安装nginx

./configure --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module

make      make install

/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf  指定配置文件

/usr/local/nginx/sbin/nginx -s reload   启动nginx

nginx安装完成 我这里只安装一台 多台一样

keepalived 安装

keepalived  下载地址 http://www.keepalived.org/software/keepalived-1.2.19.tar.gz

安装基础环境

yum -y install gcc gcc-c++ pcre-devel zlib-devel openssl-devel

内核开发包安装

yum install  kernel-devel kernel  -y

编译安装keepalived

/configure --with-kernel-dir=/usr/src/kernels/2.6.32-573.3.1.el6.x86_64/

make && make install

将安装完的keepalived 拷贝到目录

DIR=/usr/local/
         ;cp $DIR/etc/rc.d/init.d/keepalived 
         /etc/rc.d/init.d/ ; cp $DIR/etc/sysconfig/keepalived /etc/sysconfig/ ;
          mkdir -p /etc/keepalived ; cp $DIR/sbin/keepalived /usr/sbin/

chkconfig keepalived on

编辑配置文件 默认配置文件不存在

vim  /etc/keepalived/keepalived.conf

msater 配置文件

! configuration file for keepalived
#by:v
global_defs {

}

vrrp_script chk_run {
script /root/my.sh
interval 2
weight 2
}

# VIP1                                         # 第一台

vrrp_instance VI_1 {
state MASTER
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 151
priority 102
advert_int 1　　
nopreempt                           #不抢占   当master挂了之后 飘到backup 上面    master修好之后   不抢占  
authentication {
auth_typepass　　　　　　　　
auth_pass 1111
}

virtual_ipaddress {
192.168.80.43
　　　　　　　　　　　　　　　　　　　　　　　
}

track_script {
chk_run

}
}

# VIP2                                # 第二台

vrrp_instance VI_1 {
state BACKUP
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 150
priority 100
advert_int 1　　
authentication {
auth_typepass　　　　　　　　
auth_pass 2222
}

virtual_ipaddress {
192.168.80.44
　　　　　　　　　　　　　　　　　　　　　　　
}

track_script {
chk_run

}
}

backup 配置文件

vim  /etc/keepalived/keepalived.conf

vrrp_script chk_run {
script "/root/my.sh"
interval 2
weight 2
}

# VIP1
vrrp_instance VI_1 {
state BACKUP
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 151
priority 100
advert_int 1

authentication {
auth_typepass
auth_pass 1111
}

virtual_ipaddress {
192.168.80.43
}

track_script {
chk_run

}

}

# VIP2
vrrp_instance VI_1 {
state MASTER
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 150
priority 102
advert_int 1
nopreempt

authentication {
auth_typepass
auth_pass 2222
}

virtual_ipaddress {
192.168.80.44
}

track_script {
chk_run

}

}

在上面我们定义了引my.sh脚本  通过my.sh脚本检测 ngixn 是否正常 我们来写一个脚本

#!/bin/bash
A=`netstat -ltnp |grep 80 |wc -l`
if [ $A -eq 0 ];then
/etc/rc.d/init.d/keepalived stop
fi

chmod +x my.sh

启动keepalived服务     到此完成

/etc/rc.d/init.d/keepalived start