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Memcached 小结

memcached 分布式内存对象缓存系统;

内存缓存;把所取对象或数据缓存在内存中;内存中缓存的这些数据通过API的方式被存取;

数据就像是一张HASH表,以key-value对的方式存在。

用来减轻数据库的压力,提高网站的响应速度,构建快速可扩展的web应用。


内置内存管理方式;使用LUR自动删除不使用的存储,重用过期数据的内存空间。

所以重启机器之后缓存数据会丢失。


下载依赖 libevent

也可以 yum安装

# yum install libevent

源码

# https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz

# tar -xf libevent-2.0.22-stable.tar.gz 

# cd libevent-2.0.22-stable

# ./configure 

# make &&make install


memcached 下载安装;

# wget https://memcached.org/latest

[you might need to rename the file] 默认是最新版本;

# tar -zxf memcached-1.x.x.tar.gz

# cd memcached-1.x.x

# ./configure --prefix=/usr/local/memcached

# make && make test && sudo make install


启动失败?

[root@Ansible memcached-1.4.30]# /usr/local/bin/memcached 

/usr/local/bin/memcached: error while loading shared libraries: libevent-2.0.so.5: cannot open shared object file: No such file or directory


[root@Ansible memcached-1.4.30]# find / -name libevent-2.0.so.5

/opt/memcached/libevent-2.0.22-stable/.libs/libevent-2.0.so.5

/usr/local/lib/libevent-2.0.so.5

编辑 /etc/ld.so.conf  添加以上;

[root@Ansible memcached-1.4.30]# vi /etc/ld.so.conf

[root@Ansible memcached-1.4.30]# ldconfig



启动:指定root 或者切换非root

[root@Ansible memcached-1.4.30]# /usr/local/bin/memcached -m 32m -p 11211 -d -u root

# yum install telnet 

[root@Ansible memcached-1.4.30]# telnet 127.0.0.1 11211

Trying 127.0.0.1...

Connected to 127.0.0.1.

Escape character is ‘^]‘.

查看状态:

stats


管理工具

memcached-tool 

yum install memcached-tool


本文出自 “logs” 博客,请务必保留此出处http://51log.blog.51cto.com/6076767/1851188

Memcached 小结