Memcached 小结

Posted 2020-08-08

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？

[[email protected] 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

[[email protected] 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；

[[email protected] memcached-1.4.30]# vi /etc/ld.so.conf

[[email protected] memcached-1.4.30]# ldconfig

启动：指定root 或者切换非root

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

# yum install telnet 

[[email protected] 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

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