(25)keepalived的安装与配置

cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/keepalived

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

mkdir -p /etc/keepalived

cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

chmod +x /etc/init.d/keepalived

chkconfig --add keepalived

chkconfig keepalived on

global_defs {

}

vrrp_instance VI_1 {

    state MASTER   #指定A节点为主节点 备用节点上设置为BACKUP即可

    interface eth0    #绑定虚拟IP的网络接口

    virtual_router_id 51   #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组

    priority 100   #主节点的优先级（1-254之间），备用节点必须比主节点优先级低

    advert_int 1  #组播信息发送间隔(进行心跳检测的间隔)，两个节点设置必须一样

    authentication {    #设置验证信息，两个节点必须一致

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {    #指定虚拟IP(用户可见的ip地址), 两个节点设置必须一样

        192.168.33.60/24    #如果两个nginx的ip分别是192.168.33.61,,...62，则此处的虚拟ip跟它俩同一个网段即可

    }

}

global_defs {

}

vrrp_instance VI_1 {

    state BACKUP  # 备用节点

    interface eth0

    virtual_router_id 51

    priority 99

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.33.60/24

    }

}

global_defs {

}

vrrp_script chk_health {

    script "[[ `ps -ef | grep nginx | grep -v grep | wc -l` -ge 2 ]] && exit 0 || exit 1"  # 自定义脚本内容 返回1表示nginx挂了,返回0表示没挂

    interval 1    #每隔1秒执行上述的脚本，去检查用户的程序ngnix

    weight -2    # 如果本机器的nginx挂了，就降低自己的权重2

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 1

    priority 100

    advert_int 2

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    track_script {

        chk_health  # 用户自定义的脚本名

    }

    virtual_ipaddress {

        10.0.0.10/24

    }

    notify_master "/usr/local/keepalived/sbin/notify.sh master"  # 当切换到master状态时，要执行的脚本

    notify_backup "/usr/local/keepalived/sbin/notify.sh backup"  # 当切换到backup状态时，要执行的脚本

    notify_fault "/usr/local/keepalived/sbin/notify.sh fault"  # 当出现异常时，要执行的脚本

}

#!/bin/bash

case "$1" in

    master)

        /usr/local/nginx/sbin/nginx

        exit 0

    ;;

backup)

        /usr/local/nginx/sbin/nginx -s stop

        /usr/local/nginx/sbin/nginx

        exit 0

    ;;

    fault)

        /usr/local/nginx/sbin/nginx -s stop

        exit 0

    ;;

    *)

        echo ‘Usage: notify.sh {master|backup|fault}‘

        exit 1

    ;;

esac

global_defs {

}

vrrp_script chk_health {

    script "[[ `ps -ef | grep nginx | grep -v grep | wc -l` -ge 2 ]] && exit 0 || exit 1"

    interval 1

    weight -2

}

vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    virtual_router_id 1

    priority 99

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    track_script {

        chk_health

    }

    virtual_ipaddress {

        10.0.0.10/24

    }

    notify_master "/usr/local/keepalived/sbin/notify.sh master"

    notify_backup "/usr/local/keepalived/sbin/notify.sh backup"

    notify_fault "/usr/local/keepalived/sbin/notify.sh fault"

}