通过Keepalived实现Redis双机

Redis是一个高性能的kv数据库，我们用Redis构建了一套消息系统。

Redis架构为Master Slave结构，通过keepalived进行状态检查，故障迁移，达到高可用的目的。

下载keepalived

#wget http://www.keepalived.org/software/keepalived-1.2.9.tar.gz

编译安装keepalived，编译时需要指定内核目录，否则Use IPVS Framework为NO。

#./configure --prefix=/usr/local/keepalived \
--with-kernel-dir=/usr/src/kernels/3.9.10-100.fc17.x86_64 \
--enable-snmp \
--enable-sha1

配置keepalived信息如下图：

编译与安装：

#make && make install

结果报错了，重新指定配置参数，去掉 --with-kernel-dir

配置信息如下图：

在次编译安装，OK，顺利通过安装成功！

现在可以将/usr/local/keepalived下相应文件拷贝到系统对应目录

配置keepalived

在配置keepalived.conf配置文件之前先备份一份keepalived.conf文件后在进行配置

#cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

在Master机器配置keepalived

[root@node3 etc]# more /etc/keepalived/keepalived.conf
global_defs {
   notification_email {
     admin@qixing318.com
   }
   notification_email_from keepalived@node3
   router_id node3
}

vrrp_instance mes_Redis {
    state MASTER
    interface eth0
    garp_master_delay 10
    smtp_alert
    virtual_router_id 3
    priority 100
    nopreempt
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.172.100
    }
}

在Slave机器配置keepalived

[root@node4 etc]# more /etc/keepalived/keepalived.conf
global_defs {
   notification_email {
     admin@qixing318.com
   }
   notification_email_from keepalived@node4
   router_id node4
}

vrrp_instance mes_Redis {
    state BACKUP
    interface eth0
    garp_master_delay 10
    smtp_alert
    virtual_router_id 3
    priority 90
    nopreempt
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.172.100
    }
}

配置防火墙

打开Master和Slave机器上的防火墙

[root@node3 ~]# more /etc/sysconfig/iptables
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 9022 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 6379 -j ACCEPT
-A INPUT -p 112 -j ACCEPT
-A INPUT -p 255 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
[root@node3 ~]# iptables-restore /etc/sysconfig/iptables

Keepalived 的详细介绍：请点这里
Keepalived 的下载地址：请点这里

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