广州项目实施步骤III_练习使用Keepalive保证HaProxy的高可用性

CentOS6.4 配置HAProxy+Keepalived

 

安装HAProxy请参考

http://www.cnblogs.com/kgdxpr/p/3272861.html

安装Keepalived

1、下载安装依赖包

yum install -y wget make gcc openssl-devel popt-devel

2、下载、安装Keepalived

wget http://www.keepalived.org/software/keepalived-1.2.8.tar.gz

tar zxvf keepalived-1.2.8.tar.gz

cd keepalived-1.2.8

./configure --prefix=/usr/local/keepalived

make

make install

3、安装成功后做成服务模式。

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

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

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

4、配置文件

mkdir -p /etc/keepalived/

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

chmod +x /etc/init.d/keepalived

vi /etc/keepalived/keepalived.conf

global_defs {

    router_id LVS_DEVEL

}

#监测haproxy进程状态，每2秒执行一次

vrrp_script chk_haproxy {

    script "/etc/keepalived/chk_haproxy.sh"

    interval 2

    weight 2

}

vrrp_instance VI_1 {

    state MASTER          #从服务器为BACKUP

    interface eth0

    virtual_router_id 51

    priority 100             #从服务器要低于100

    advert_int 1

    mcast_src_ip 10.10.3.171    #MASTER服务器IP,从服务器写从服务器的IP

    authentication {

        auth_type PASS

        auth_pass 111111

    }

    track_script {

        chk_haproxy    #监测haproxy进程状态

    }

    virtual_ipaddress {

        10.10.3.170    #虚拟IP

    }

}

chk_haproxy.sh内容

vi /etc/keepalived/chk_haproxy.sh

status=$(ps aux|grep haproxy | grep -v grep | grep -v bash | wc -l)

if [ "${status}" = "0" ]; then

    /etc/init.d/haproxy start



    status2=$(ps aux|grep haproxy | grep -v grep | grep -v bash |wc -l)



    if [ "${status2}" = "0"  ]; then

            /etc/init.d/keepalived stop

    fi

fi

启动和关闭服务

service keepalived start

service keepalived stop

高可用测试

1、将Master上的keepalived停止



查看Master上的日志



tail -f /var/log/messages



Sep 23 01:24:34 181 Keepalived[3125]: Stopping Keepalived v1.2.8 (09/23,2013)

Sep 23 01:24:34 181 Keepalived_vrrp[3127]: VRRP_Instance(VI_1) sending 0 priority

Sep 23 01:24:34 181 Keepalived_vrrp[3127]: VRRP_Instance(VI_1) removing protocol VIPs.



发现Master释放了VIP



再查看Backup上的日志



Sep 23 01:20:26 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Transition to MASTER STATE

Sep 23 01:20:27 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Entering MASTER STATE

Sep 23 01:20:27 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) setting protocol VIPs.

Sep 23 01:20:27 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.10.3.180

Sep 23 01:20:27 182 Keepalived_healthcheckers[2886]: Netlink reflector reports IP 10.10.3.180 added



发现Backup绑定了VIP



2、将Master上的keepalived启动



查看Master上的日志



tail -f /var/log/messages



Sep 23 01:27:56 181 Keepalived_vrrp[3450]: VRRP_Instance(VI_1) Entering MASTER STATE

Sep 23 01:27:56 181 Keepalived_vrrp[3450]: VRRP_Instance(VI_1) setting protocol VIPs.

Sep 23 01:27:56 181 Keepalived_vrrp[3450]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.10.3.180

Sep 23 01:27:56 181 Keepalived_healthcheckers[3449]: Netlink reflector reports IP 10.10.3.180 added



发现Master绑定了VIP



再查看Backup上的日志



Sep 23 01:21:15 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Received higher prio advert

Sep 23 01:21:15 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) Entering BACKUP STATE

Sep 23 01:21:15 182 Keepalived_vrrp[2887]: VRRP_Instance(VI_1) removing protocol VIPs.

Sep 23 01:21:15 182 Keepalived_healthcheckers[2886]: Netlink reflector reports IP 10.10.3.180 removed



发现Backup释放了VIP