Memcached 小結

memcached 分布式內存對象緩存系統；

內存緩存；把所取對象或數據緩存在內存中；內存中緩存的這些數據通過API的方式被存取；

數據就像是一張HASH表，以key-value對的方式存在。

用來減輕數據庫的壓力，提高網站的響應速度，構建快速可擴展的web應用。

內置內存管理方式；使用LUR自動刪除不使用的存儲，重用過期數據的內存空間。

所以重啟機器之后緩存數據會丟失。

下載依賴 libevent

也可以 yum安裝

# yum install libevent

源碼

# 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 下載安裝；

# wget https://memcached.org/latest

[you might need to rename the file] 默認是最新版本；

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

# cd memcached-1.x.x

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

# make && make test && sudo make install

啟動失敗？

[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

編輯 /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

啟動：指定root 或者切換非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 '^]'.

查看狀態：

stats

管理工具

memcached-tool 

yum install memcached-tool