keepalived for redhat linux 5配置

linux6

有个项目可能用到，因此研究了一下。
Keepalived是Linux下面实现VRRP 备份路由的高可靠性运行件。基于Keepalived设计的服务模式能够真正做到主服务器和备份服务器故障时IP瞬间无缝交接。
网络环境：
三台服务器：
VIP:192.168.1.30
realserver1:192.168.1.22
realserver2:192.168.1.23
安装步骤：
前提条件需要有安装如下组件：
openssl-devel-0.9.8a-18.26.i586.rpm
popt-devel-1.7-271.27.i586.rpm
keepalived的安装比较简单（下载地址：
http://www.keepalived.org
）：
在realserver1上操作：
在keepalived的解压目录执行如下命令：
#./configure --prefix=/usr/local/keepalived
#make
#make install
主要是修改配置文件（/usr/local/keepalived/etc/keepalived/keepalived.conf）:
! Configuration File for keepalived
global_defs {
   notification_email {
   
39116712@qq.com
   }
   notification_email_from
admin@qq.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id HA_1
}
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    mcast_src_ip 192.168.1.22
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass freeke
    }
    virtual_ipaddress {
    192.168.1.30
    }
}
在realserver2上执行与realserver1的相同操作，配置文件有点区别，主要体现在state和priority参数上如下：
! Configuration File for keepalived
global_defs {
   notification_email {
   
39116712@qq.com
   }
   notification_email_from
admin@qq.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id HA_1
}
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    mcast_src_ip 192.168.1.22
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass freeke
    }
    virtual_ipaddress {
    192.168.1.30
    }
}
经过以上的操作只需要执行如下命令即可启动：
#/usr/local/keepalived/sbin/keepalived -f /usr/local/keepalived/etc/keepalived/keepalived.conf -D
查看是否启动成功可按照如下方法操作：
A.  # tail -f /var/log/messages
若有如下内容输出则启动成功：

Jul  1 06:19:29 db Keepalived: Starting Keepalived v1.1.17 (06/28,2009)
Jul  1 06:19:29 db Keepalived: Starting Healthcheck child process, pid=1527
Jul  1 06:19:29 db Keepalived: Starting VRRP child process, pid=1528
Jul  1 06:19:29 db Keepalived_healthcheckers: Using MII-BMSR NIC polling thread...
Jul  1 06:19:29 db Keepalived_vrrp: Using MII-BMSR NIC polling thread...
Jul  1 06:19:29 db Keepalived_healthcheckers: Netlink reflector reports IP 192.168.1.22 added
Jul  1 06:19:29 db Keepalived_healthcheckers: Registering Kernel netlink reflector
Jul  1 06:19:29 db Keepalived_healthcheckers: Registering Kernel netlink command channel
Jul  1 06:19:29 db Keepalived_healthcheckers: Opening file 'etc/keepalived/keepalived.conf'.
Jul  1 06:19:29 db Keepalived_healthcheckers: Configuration is using : 5901 Bytes
Jul  1 06:19:29 db Keepalived_vrrp: Netlink reflector reports IP 192.168.1.22 added
Jul  1 06:19:29 db Keepalived_vrrp: Registering Kernel netlink reflector
Jul  1 06:19:29 db Keepalived_vrrp: Registering Kernel netlink command channel
Jul  1 06:19:29 db Keepalived_vrrp: Registering gratutious ARP shared channel
Jul  1 06:19:29 db Keepalived_vrrp: Opening file 'etc/keepalived/keepalived.conf'.
Jul  1 06:19:29 db Keepalived_vrrp: Configuration is using : 35764 Bytes
Jul  1 06:19:29 db Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(10,11)]
Jul  1 06:19:30 db Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Jul  1 06:19:31 db Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Jul  1 06:19:31 db Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
Jul  1 06:19:31 db Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.30
Jul  1 06:19:31 db avahi-daemon[2425]: Registering new address record for 192.168.1.30 on eth0.
Jul  1 06:19:31 db Keepalived_healthcheckers: Netlink reflector reports IP 192.168.1.30 added
Jul  1 06:19:31 db Keepalived_vrrp: Netlink reflector reports IP 192.168.1.30 added
Jul  1 06:19:36 db Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.30
B. ping 192.168.1.30有返回值则OK。
可以在服务器master服务器上执行：ip add show eth0
看看是否有192.168.1.30的虚拟IP存在，存在则正常。

到此完成了keepalived的配置。只要在真实机器上启动相应的服务看看是否正常，有问题记得日志。到此完成了keepalived的双机配置。






本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/23251/showart_1982307.html