centos7安装keepalived实现负载均衡

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yum install -y openssl openssl-devel
wget http://tar.matosiki.site/tar/keepalived-2.0.0.tar.gz
tar -zxvf keepalived-2.0.0.tar.gz  -C /usr/local/
cd /usr/local/keepalived-2.0.0/ && ./configure --prefix=/usr/local/keepalived
make && make install

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mkdir -p /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

cp /usr/local/keepalived-2.0.0/keepalived/etc/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived-2.0.0/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

ln -s /usr/local/sbin/keepalived /usr/sbin/
# ln -s /usr/local/keepalived/sbin/keepalived /sbin/

chmod 755 /etc/init.d/keepalived
chkconfig keepalived on

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vi /etc/keepalived/keepalived.conf

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global_defs {
    router_id NODE1 # 更改路由编号
}
vrrp_script chk_http_port {
    script "/etc/keepalived/nginx_check.sh" # 检查脚本
    interval 2
    weight -20 # 权重减20
}
vrrp_instance VI_1 {
    state MASTER  # 主节点为MASTER，备份节点为BACKUP
    interface ens33 # 网卡名称
    virtual_router_id 50 #虚拟路由编号
    priority 100  # 优先级配置0-254
    advert_int 1  # 组播信息发送间隔，两个节点必须配置一致，默认1s
    authentication {
        auth_type PASS
        auth_pass matosiki  # 真实生产环境下对密码进行匹配
    }
    track_script {
        chk_http_port
    }
    virtual_ipaddress {
        192.168.10.66/24 #  虚拟ip(vip)，可以指定多个 两个节点保持一直
    }
}

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global_defs {
   router_id NODE2
}

vrrp_script chk_http_port {
    script "/etc/keepalived/nginx_check.sh"
    interval 2
    weight -20
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 50
    priority 90 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass matosiki
    }
   track_script {
       chk_http_port
   }
    virtual_ipaddress {
        192.168.10.66/24
    }
}

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vi /etc/keepalived/nginx_check.sh

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A=`ps -C nginx –no-header |wc -l`
if [ $A -eq 0 ];
then
    /usr/local/nginx/sbin/nginx
    sleep 2
    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];
    then
        killall keepalived
    fi
fi

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chmod +x /etc/keepalived/nginx_check.sh

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service keepalived start
ip a
ps -ef | grep nginx 
ps -ef | grep keepalived