MQ RabbitMQ 高可用集群(四):Keepalived安装和配置

1 简介

Keepalived,它是一个高性能的服务器高可用或热备解决方案,Keepalived主要来防止服务器单点故障的发生问题,可以通过其与Nginx、Haproxy等反向代理的负载均衡服务器配合实现web服务端的高可用。Keepalived以VRRP协议为实现基础,用VRRP协议来实现高可用性(HA).VRRP(Virtual Router Redundancy Protocol)协议是用于实现路由器冗余的协议,VRRP协议将两台或多台路由器设备虚拟成一个设备,对外提供虚拟路由器IP(一个或多个)。

2 安装配置

2.1 安装依赖

[root@localhost ~]# yum install -y openssl openssl-devel

2.2 编译安装

[root@localhost ~]# wget http://www.keepalived.org/software/keepalived-1.2.18.tar.gz
[root@localhost ~]# tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/
[root@localhost ~]# cd ..
[root@localhost ~]# cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived
[root@localhost ~]# make && make install

2.3 配置

2.3.1 自定义配置

将keepalived安装成Linux系统服务,因为没有使用keepalived的默认安装路径(默认路径:/usr/local),安装完成之后,需要做一些修改工作

[root@localhost ~]# mkdir /etc/keepalived
[root@localhost ~]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

复制keepalived脚本文件

[root@localhost ~]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
[root@localhost ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@localhost ~]# ln -s /usr/local/sbin/keepalived /usr/sbin/

如果存在则进行删除: rm /sbin/keepalived

[root@localhost ~]# ln -s /usr/local/keepalived/sbin/keepalived /sbin/

2.3.2 设置开机启动

可以设置开机启动:chkconfig keepalived on,到此我们安装完毕

[root@localhost ~]# chkconfig keepalived on

2.3.3 配置信息

修改keepalived.conf配置文件:

[root@localhost ~]# vi /etc/keepalived/keepalived.conf

79节点(Master)配置如下:

! Configuration File for keepalived

global_defs {
     
   router_id bhz74  ##标识节点的字符串,通常为hostname

}

vrrp_script chk_haproxy {
     
    script "/etc/keepalived/haproxy_check.sh"  ##执行脚本位置
    interval 2  ##检测时间间隔
    weight -20  ##如果条件成立则权重减20
}

vrrp_instance VI_1 {
     
    state MASTER  ## 主节点为MASTER,备份节点为BACKUP
    interface eno16777736 ## 绑定虚拟IP的网络接口(网卡),与本机IP地址所在的网络接口相同(我这里是eth0)
    virtual_router_id 74  ## 虚拟路由ID号(主备节点一定要相同)
    mcast_src_ip 192.168.11.74 ## 本机ip地址
    priority 100  ##优先级配置(0-254的值)
    nopreempt
    advert_int 1  ## 组播信息发送间隔,俩个节点必须配置一致,默认1s
authentication {
       ## 认证匹配
        auth_type PASS
        auth_pass bhz
    }

    track_script {
     
        chk_haproxy
    }

    virtual_ipaddress {
     
        192.168.11.70  ## 虚拟ip,可以指定多个
    }
}

80节点(backup)配置如下:

! Configuration File for keepalived

global_defs {
     
   router_id bhz75  ##标识节点的字符串,通常为hostname

}

vrrp_script chk_haproxy {
     
    script "/etc/keepalived/haproxy_check.sh"  ##执行脚本位置
    interval 2  ##检测时间间隔
    weight -20  ##如果条件成立则权重减20
}

vrrp_instance VI_1 {
     
    state BACKUP  ## 主节点为MASTER,备份节点为BACKUP
    interface eno16777736 ## 绑定虚拟IP的网络接口(网卡),与本机IP地址所在的网络接口相同(我这里是eno16777736)
    virtual_router_id 74  ## 虚拟路由ID号(主备节点一定要相同)
    mcast_src_ip 192.168.11.75  ## 本机ip地址
    priority 90  ##优先级配置(0-254的值)
    nopreempt
    advert_int 1  ## 组播信息发送间隔,俩个节点必须配置一致,默认1s
authentication {
       ## 认证匹配
        auth_type PASS
        auth_pass bhz
    }

    track_script {
     
        chk_haproxy
    }

    virtual_ipaddress {
     
        192.168.1.70  ## 虚拟ip,可以指定多个
    }
}

3 自定义脚本

3.1 编写脚本

添加文件位置为/etc/keepalived/haproxy_check.sh(74、75两个节点文件内容一致即可)

#!/bin/bash
COUNT=`ps -C haproxy --no-header |wc -l`
if [ $COUNT -eq 0 ];then
    /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
    sleep 2
    if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then
        killall keepalived
    fi
fi

3.2 授权

haproxy_check.sh脚本授权,赋予可执行权限.

[root@localhost ~]# chmod +x /etc/keepalived/haproxy_check.sh

4 启动与测试

4.1 启动 keepalived

启动成功两个haproxy节点以后,我们可以启动keepalived服务程序

如果74、75的haproxy没有启动则执行启动脚本

[root@localhost ~]# /usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg

启动两台机器keepalived

[root@localhost ~]# service keepalived start | stop | status | restart

查看 haproxy、keepalived 进程状态

[root@localhost ~]# ps -ef | grep haproxy
[root@localhost ~]# ps -ef | grep keepalived

4.2 高可用测试

vip在27节点上

MQ RabbitMQ 高可用集群(四):Keepalived安装和配置_第1张图片

27节点宕机测试:停掉27的keepalived服务即可

MQ RabbitMQ 高可用集群(四):Keepalived安装和配置_第2张图片

查看28节点状态:我们发现VIP漂移到了28节点上,那么28节点的haproxy可以继续对外提供服务

MQ RabbitMQ 高可用集群(四):Keepalived安装和配置_第3张图片

5 相关信息

上一篇:MQ RabbitMQ 高可用集群(三):Ha-Proxy安装和配置

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