keepalived nginx 双机热备图文讲解

tar zxf keepalived-1.2.20.tar.gz -C /usr/local/src/
cd /usr/local/src/keepalived-1.2.20/
./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.32-573.22.1.el6.x86_64/
make && make install

mkdir -p /etc/keepalived 
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ 
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ 
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ 
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

mkdir -p /data/sh

touch /data/sh/keepalived_check.sh
touch /data/sh/nginx_check.sh
touch /data/sh/nginx_rsync.sh

chmod +x /data/sh/keepalived_check.sh
chmod +x /data/sh/nginx_check.sh
chmod +x /data/sh/nginx_rsync.sh

! Configuration File for keepalived

############################ 全局配置 #############################

global_defs {

# 定义管理员邮件地址,表示keepalived在发生诸如切换操作时需要发送email通知,以及email发送给哪些邮件地址,可以有多个,每行一个
    notification_email {
        hongxue@showjoy.com
    }

# 表示发送通知的邮件源地址是谁
    notification_email_from keepalived@showjoy.com

# smtp服务器配置
    smtp_server 127.0.0.1
    smtp_connect_timeout 30

# router_id 则为机器标识
    router_id keepalived_1

#   vrrp_skip_check_adv_addr
#   vrrp_strict

}

############################ VRRPD配置 #############################

# 定义nginx_check脚本,脚本执行间隔10秒，权重10
#vrrp_script nginx_check {
#    script "/data/sh/nginx_check.sh"
#    interval 10
#    weight 10
#}


# 定义vrrp实例
vrrp_instance http {

# state定义instance的初始状态
    state BACKUP

# 实际绑定的网卡，配置虚拟IP的时候必须是在已有的网卡上面添加的
    interface eth0

# 要检测状态的网卡，当其中任意一块出现故障时keepalived都视为故障
    track_interface {
        eth0
#       eth1
    }

# 当该keepalived切换为MASTER状态时，执行下面的脚本
    notify_master /data/sh/keepalived_check.sh

# 这里设置VRID，相同的VRID为一个组，他将决定多播的MAC地址
    virtual_router_id 51

# 设置本节点优先级，高的为MASTER，如果优先级一样，则IP地址大的是MASTER
    priority 200

# 组播信息发送间隔,两个节点设置必须一样
    advert_int 10

# 验证方式与验证密码
    authentication {
        auth_type PASS
        auth_pass 1111
    }

# 这里设置VIP，它随着state变化而增加删除，当state为master的时候就添加，当state为backup的时候则删除，由优先级决定，可以设置多个地址
    virtual_ipaddress {
        192.168.1.60
        192.168.1.61
    }

# 设置不抢占，这里只能设置在state为backup的节点上，而且这个节点的优先级必须别另外的高
#    nopreempt

# 执行nginx检测脚本
#    track_script {
#        nginx_check weight 10
#    }

}

! Configuration File for keepalived

############################ 全局配置 #############################

global_defs {

# 定义管理员邮件地址,表示keepalived在发生诸如切换操作时需要发送email通知,以及email发送给哪些邮件地址,可以有多个,每行一个
    notification_email {
        hongxue@showjoy.com
    }

# 表示发送通知的邮件源地址是谁
    notification_email_from keepalived@showjoy.com

# smtp服务器配置
    smtp_server 127.0.0.1
    smtp_connect_timeout 30

# router_id 则为机器标识
    router_id keepalived_1

#   vrrp_skip_check_adv_addr
#   vrrp_strict

}

############################ VRRPD配置 #############################

# 定义vrrp脚本,脚本执行间隔10秒，权重10
#vrrp_script nginx_check {
#    script "/data/sh/nginx_check.sh"
#    interval 10
#    weight 10
#}


# 定义vrrp实例
vrrp_instance http {

# state定义instance的初始状态
    state BACKUP

# 实际绑定的网卡，配置虚拟IP的时候必须是在已有的网卡上面添加的
    interface eth0

# 要检测状态的网卡，当其中任意一块出现故障时keepalived都视为故障
    track_interface {
        eth0
#       eth1
    }

# 当该keepalived切换为MASTER状态时,执行下面的脚本
    notify_master /data/sh/keepalived_check.sh


# 这里设置VRID，相同的VRID为一个组，他将决定多播的MAC地址
    virtual_router_id 51

# 设置本节点优先级，高的为MASTER，如果优先级一样，则IP地址大的是MASTER
    priority 200

# 组播信息发送间隔,两个节点设置必须一样
    advert_int 10

# 验证方式与验证密码
    authentication {
        auth_type PASS
        auth_pass 1111
    }

# 这里设置VIP，它随着state变化而增加删除，当state为master的时候就添加，当state为backup的时候则删除，由优先级决定，可以设置多个地址
    virtual_ipaddress {
        192.168.1.60
        192.168.1.61
    }

# 设置不抢占，这里只能设置在state为backup的节点上，而且这个节点的优先级必须别另外的高
#   nopreempt

# 执行nginx_check叫测脚本
#    track_script {
#        nginx_check weight 10
#    }

}

#!/bin/bash
time=$(date +%Y-%m-%d-%H-%M)
echo “$time keepalived-1 is a down,keepalived-2 is a MASTER”|mail -s keepalived_down xxx@xxx.com
echo “$time keepalived-1 is a down,keepalived-2 is a MASTER”|mail -s keepalived_down xxx@xxx.com

#!/bin/bash

while  :
do

# 获取nginx、keepalived的进程数
nginxcheck=`ps -C nginx --no-header | wc -l`
keepalivedcheck=`ps -C keepalived --no-header | wc -l`

# 如果检测到(nginx)进程数等于0,并且(keepalived)进程数不等于0,则关闭(keepalived)
if [ $nginxcheck -eq 0 ];then
    if [ $keepalivedcheck -ne 0 ];then
        killall -TERM keepalived
    else
        echo "keepalived is stoped"
    fi

# 如果检测到(nginx)进程数不等于0,则(keepalived)进程数等于0,那么启动keepalived服务
else
    if [ $keepalivedcheck -eq 0 ];then
        /etc/init.d/keepalived start
    else
        echo "keepalived is running"
    fi
fi

sleep 10
done

#!/bin/bash

ip_address="192.168.1.51"

inotify_cmd="inotifywait -mrq -e modify,create,attrib,move,delete /usr/local/nginx/"
rsync_cmd="rsync -azH --delete /usr/local/nginx/ root@${ip_address}:/usr/local/nginx/"

$inotify_cmd | while read DIRECTORY EVENT FILE
do
    if [ $(pgrep rsync | wc -l) -le 0 ];then
        $rsync_cmd
        ssh root@${ip_address} "/usr/local/nginx/sbin/nginx -t"
        if [ $? -eq 0 ];then
            ssh root@${ip_address} "/usr/local/nginx/sbin/nginx -s reload"
        fi        
    fi
done