Redis+Keepalived实现双机不间断缓存<一>

引言:

在不停的性能,性能的要求下,缓存使用的越来越多.缓存地位越来越高,但如果缓存机挂掉呢?就得从原来的地方去取了,

达不到我们想的效果.此时,或许分布式,多机缓存同步,等方式,能解决该状况.但个人感觉相较而言编程复杂较大.

本文介绍一下,本人最近用的方法.本人资历尚浅,仅希望本文能够抛砖引玉,让各位达人前来指点.

本文第一部分,介绍这两种工具如何在linux下的安装.

本文第二部分,介绍如何利用这两种工具,来实现自动同步缓存数据,自动切换缓存主机.

 

 

第一部分介绍如何安装Redis和Keepalived

 

1.先安装的Redis

主要参照:http://www.oschina.net/question/12_18065

1.1.wget

1.2.tar -zxvf ...

1.3.make

1.4.此时照上网上的说话,是

                 cp redis.conf /etc/ 这个文件时redis启动的配置文件
                 cp redis-benchmark redis-cli redis-server /usr/bin/ #这个倒是很有用，这样就不用再执行时加上./了，而且可以在任何地方执行

        但实际执行起来,只有第一个成功,后在这三个文件找不到.

         --->解决方法,直接makeinstall即可.

 

 

2.安装keepalived

参照:http://haolulu.blog.51cto.com/3164472/600214

(没有出现文中,出现的错误,但是出现以下错误)

 

2.1.wget http://www.keepalived.org/software/keepalived-1.1.20.tar.gz

 

2.2.tar -zxvf ....

 

2.3. ./configure

            出现错误:

                            configure: error:

                              !!! OpenSSL is not properly installed on your system. !!!

                              !!! Can not include OpenSSL headers files.            !!!

            解决方案:

                             yum -y installopenssl-devel  

 

           出现错误:

                           操作上面之后,出现

                            checking for poptGetContext in -lpopt... no

                            configure: error: Popt libraries is required

            解决方案:

                            同上

                            错误是因为没有安装popt的开发包导致的，解决方法也很简单.

                            只要yum install popt-devel

2.4.make

 

2.5.make install

 

2.6.修改配置文件路径

 

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

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

        mkdir /etc/keepalived

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

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

 

2.7:设置为开机启动

        vi /etc/rc.local

        i-->最后输入"/etc/init.d/keepalived start"-->esc-->:wq!

 

2.8:修改配置文件

        vi /etc/keepalived/keepalived.conf

        修改下面这段:

    vrrp_instance VI_1 {

        state BACKUP    ---主服务器:MASTER     备份机为BACKUP

        interface eth0

        virtual_router_id 51

        priority 80     ---权重,比主服务低

        advert_int 1

        authentication {

            auth_type PASS

            auth_pass 1111

        }

        virtual_ipaddress {

            192.168.36.2---虚IP

        }

    }

 

2.9:启动keepalived    service keepalived start

 

2.10:关闭keepalived    service keepalived stop

 

 

到此安装完毕,剩余见下篇.