memcache集群 demo

 

环境:Memcache1.4.x+Magent0.6+CentOS5.x(32bit)+Maven3.x

 

概述:本教程包含Memcache安装,Libevent安装,集群管理者Magent安装,Telnet测试,Java测试。

 

1、Libevent安装

由于Memcache依赖libevent,所以需要先安装libevent.

采用yum安装:yum install libevent libevent-devel

 

 

2、Memcache安装

 

采用yum安装。

直接用yum install memcached

 

注:如果提示no package.

那么需要补充一下Yum的仓库

可以用以下的仓库:

 

# rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

 

 

3、Magent安装

这个不好用yum安装。

到http://code.google.com/p/memagent/这里下载magent0.6.tar.gz

3.1 拷贝到/usr/local目录下

3.2 解压:tar zxvf magent-0.6.tar.gz 

3.3 会产生4个文件

ketama.c

ketama.h

magent.c

Makefile

 

3.4 输入如下命令:

 

/sbin/ldconfig

 

 

3.5 输入如下命令:

 

sed -i "s#LIBS = -levent#LIBS = -levent -lm#g" Makefile

 

 

3.6 输入如下命令:

 

Make

 

 

4 配置memcache服务:

 

memcached -m 1 -u root -d -l 192.168.0.107 -p 11212
memcached -m 1 -u root -d -l 192.168.0.107 -p 11213
memcached -m 1 -u root -d -l 192.168.0.107 -p 11214

 

 

5 启动magent服务:

./magent -u root -n 4096 -l 192.168.0.107 -p 12000 -s 192.168.0.107:11212 -s 192.168.0.107:11213 -b 192.168.1.118:11214

 其中,12000是magent的端口,11212、11213是memcached的主进程,11214是备用进程。

 

6.用windows的telnet测试,测试流程如下:

[root@localhost ~]# telnet 192.168.1.118 12000

Trying 192.168.1.118...

Connected to 192.168.1.118 (192.168.1.118).

Escape character is '^]'.

stats

memcached agent v0.6

matrix 1 -> 192.168.1.118:11212, pool size 0

matrix 2 -> 192.168.1.118:11213, pool size 1

END

set key1 0 0 5

hello

STORED

set key2 0 0 5

world

STORED

quit

Connection closed by foreign host.

 

[root@localhost ~]# telnet 192.168.1.118 11212

Trying 192.168.1.118...

Connected to 192.168.1.118 (192.168.1.118).

Escape character is '^]'.

get key1

END

get key2

VALUE key2 0 5

world

END

quit

Connection closed by foreign host.

 

[root@localhost ~]# telnet 192.168.1.118 11213

Trying 192.168.1.118...

Connected to 192.168.1.118 (192.168.1.118).

Escape character is '^]'.

get key1

VALUE key1 0 5

hello

END

get key2

END

quit

Connection closed by foreign host.

 

[root@localhost ~]# telnet 192.168.1.118 11214

Trying 192.168.1.118...

Connected to 192.168.1.118 (192.168.1.118).

Escape character is '^]'.

get key1

VALUE key1 0 5

hello

END

get key2

VALUE key2 0 5

world

END

quit

Connection closed by foreign host.

 模拟1121211213端口的memcache死掉

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

root      5126     1  0 19:14 ?        00:00:00 memcached -m 1 -u root -d -l 192.168.1.118 -p 11212

root      5134     1  0 19:14 ?        00:00:00 memcached -m 1 -u root -d -l 192.168.1.118 -p 11213

root      5142     1  0 19:14 ?        00:00:00 memcached -m 1 -u root -d -l 192.168.1.118 -p 11214

root      5976  5526  0 20:11 pts/1    00:00:00 grep memcached

[root@localhost ~]# kill -9 5126

[root@localhost ~]# kill -9 5134

[root@localhost ~]# telnet 192.168.1.118 12000

Trying 192.168.1.118...

Connected to 192.168.1.118 (192.168.1.118).

Escape character is '^]'.

get key1

VALUE key1 0 5

hello

END

get key2

VALUE key2 0 5

world

END

quit

Connection closed by foreign host.

 

模拟1121211213端口的memcache重启复活

[root@localhost ~]# memcached -m 1 -u root -d -l 192.168.1.118 -p 11212

[root@localhost ~]# memcached -m 1 -u root -d -l 192.168.1.118 -p 11213

[root@localhost ~]# telnet 192.168.1.118 12000

Trying 192.168.1.118...

Connected to 192.168.1.118 (192.168.1.118).

Escape character is '^]'.

get key1

END

get key2

END

quit

Connection closed by foreign host.

 

7. magent的语法较难理解,可以参考如下语法:

Storage Commands

Parameters :
<key> : the key of the data stored
<flags> : 32-bit unsigned integer that the server store with the data (provided by the user), and return along the data when the item is retrieved
<exptime> : expiration time in seconds, 0 mean no delay, if exptime is superior to 30 day, Memcached will use it as a UNIX timestamps for expiration
<bytes> : number of bytes in the data block
<cas unique> : unique 64-bit value of an existing entry (retrieved with gets command) to use with cas command
[noreply] : optional parameter that inform the server to not send the reply

These commands can return :
STORED to indicate success
NOT_STORED indicate that the data was not stored because condition for "add" or "replace" command wasn't met, or the item is in a delete queue
EXISTS indicate that the item you are trying to store with "cas" command has been modified since last fetch
NOT_FOUND indicate that the item did not exist or has been deleted 

Set

Store key/value pair in Memcached

Telnet command : set <key> <flags> <exptime> <bytes> [noreply]\r\n<value>\r\n

set key 0 900 4
data
STORED

 

 

8.Java客户端,常规的有3种

  •    memcached client for java
  •    spymemcached
  •    xmemcached

 

 

9.yum源分为以下几种,RPMForge, EPEL, REMI, ATrpms, Webtatic,我用的是EPEL

 

10.注意到:memcached client如果没办法直接下载Jar的话,可以连接到gitHub后,下载它的源码打开POM文件,看它的maven坐标是多少。

 

----------------------------------------------------------------------------------

参考资料:

https://daxingplay.me/study/centos/centos-yum-install-memcached.html    yum安装memcached

 

http://www.liquidweb.com/kb/install-memcached-on-centos-5/  yum安装lib event

 

http://ljh0721.iteye.com/blog/1812376  测试流程讲得非常详细。

 

 

http://blog.elijaa.org/?post/2010/05/21/Memcached-telnet-command-summary  telnet memcached语法详解

 

 

http://jony-hwong.iteye.com/blog/1174985 telnet memcached语法讲解,没有上面那个清晰。

 

http://code.google.com/p/memagent/  agent官网,语法讲解

 

 

http://freeloda.blog.51cto.com/2033581/1260824 Centos5 yum EPEL源详解

 

http://tecadmin.net/top-5-yum-repositories-for-centos-rhel-systems/  yum所有源讲解

 

http://www.vpsyou.com/2010/04/24/centos5-optimization-under-memcache-installation.html libevent安装成功测试、memcached安装成功测试

 

http://www.yourhowto.net/install-memcached-on-centos-5-and-6/  memcache安装后的一些配置,这个是我第一个参考的教程,不错。

 

 

http://blog.csdn.net/hjm4702192/article/details/7894080 完整的用Java Memcache Client的例子。

 

 

https://github.com/gwhalin/Memcached-Java-Client  Memcached客户端官网。

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

你可能感兴趣的:(memcache)