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

分手后的思念是犯贱 2022-03-31 03:28 93阅读 0赞

# [CentOS6.4 配置HAProxy+Keepalived][CentOS6.4 _HAProxy_Keepalived] #

安装HAProxy请参考

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

![复制代码][copycode.gif]

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
        }
    }

![复制代码][copycode.gif]

chk\_haproxy.sh内容

vi /etc/keepalived/chk_haproxy.sh

![复制代码][copycode.gif]

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

![复制代码][copycode.gif]

启动和关闭服务

service keepalived start
    service keepalived stop

高可用测试

![复制代码][copycode.gif]

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

![复制代码][copycode.gif]

[CentOS6.4 _HAProxy_Keepalived]: http://www.cnblogs.com/kgdxpr/p/3325788.html
[http_www.cnblogs.com_kgdxpr_p_3272861.html]: http://www.cnblogs.com/kgdxpr/p/3272861.html
[copycode.gif]: /images/20220331/73408aedf87341bcb781a3aa6ba8f00f.png