linux下memcached的安装与配置
memcached是一套分布式内存对象缓存系统，用在动态中减少数据库负载，进行提升系统性能，memcached很多时候都是作为数据库前端cached使用，减少了磁盘开销，它是用内存读取的，速度更快列出安装memcached的三个安装包
# ls
libevent-1.4.14b-stable.tar.gzmemcached-1.4.13.tar.gzmemcache-2.2.5.tgz
安装libevent
# tar -zxvf libevent-1.4.14b-stable.tar.gz
# cd libevent-1.4.14b-stablew
# ./configure
# make && make install
列出安装好相关文件，测试安装是成功的
# ls -al /usr/lib |grep libevent
lrwxrwxrwx.1 root root 21 Mar9 12:01 libevent-1.4.so.2 -> libevent-1.4.so.2.1.3
-rwxr-xr-x.1 root root108948 Aug 202010 libevent-1.4.so.2.1.3
-rw-r--r--.1 root root133014 Aug 202010 libevent.a
lrwxrwxrwx.1 root root 26 Mar9 12:01 libevent_core-1.4.so.2 -> libevent_core-1.4.so.2.1.3
-rwxr-xr-x.1 root root 37080 Aug 202010 libevent_core-1.4.so.2.1.3
-rw-r--r--.1 root root 47248 Aug 202010 libevent_core.a
lrwxrwxrwx.1 root root 26 Mar9 12:01 libevent_core.so -> libevent_core-1.4.so.2.1.3
lrwxrwxrwx.1 root root 27 Mar9 12:01 libevent_extra-1.4.so.2 -> libevent_extra-1.4.so.2.1.3
-rwxr-xr-x.1 root root 84228 Aug 202010 libevent_extra-1.4.so.2.1.3
-rw-r--r--.1 root root103130 Aug 202010 libevent_extra.a
lrwxrwxrwx.1 root root 27 Mar9 12:01 libevent_extra.so -> libevent_extra-1.4.so.2.1.3
lrwxrwxrwx.1 root root 21 Mar9 12:01 libevent.so -> libevent-1.4.so.2.1.3
因为我安装的时候缺少了很多的库，所以我就yum安装了基本的所有的库
yum -y install ntp make openssl openssl-devel pcre pcre-devel libpng libpng-devel libjpeg-6b libjpeg-devel-6b freetype freetype-devel gd gd-devel zlib zlib-devel gcc gcc-c++ libXpm libXpm-devel ncurses ncurses-devel libmcrypt libmcrypt-devel libxml2 libxml2-devel imake autoconf automake screen sysstat compat-libstdc++-33 curl curl-devel
安装memcached
# tar -zxvf memcached-1.4.13.tar.gz
# cd memcached-1.4.13
# ./configure --prefix=/usr/local/memcached
# make && make instal
列出安装好的相关文件，测试安装成功
# ls -al /usr/local/memcached/bin/
total 252
drwxr-xr-x. 2 root root 4096 Mar9 12:17 .
drwxr-xr-x. 5 root root 4096 Mar9 12:17 ..
-rwxr-xr-x. 1 root root 247605 Mar9 12:17 memcached
启动memcached
# /usr/local/memcached/bin/memcached -m 32m -p 11211 -d -u root -P /var/run/memcached.pid -c 256
查看memcached的进程
# ps -ef |grep memcached
root 4306 10 07:31 ? 00:00:00 /usr/local/memcached/bin/memcached -m 32m -p 11211 -d -u root -P /var/run/memcached.pid -c 256
root 431342490 07:31 pts/2 00:00:00 grep memcached
查看memcached的端口号11211
# netstat -tlnp |grep 11211
tcp 0 0 0.0.0.0:11211 0.0.0.0:* LISTEN 4317/memcached
tcp 0 0 :::11211 :::* LISTEN 4317/memcached
我们用telnet测试一下memcached
# telnet 192.168.184.128 11211
Trying 192.168.184.128...
Connected to 192.168.184.128.
Escape character is '^]'.
安装memcache的php扩展
# tar -zxvf memcache-2.2.5.tgz
# cd memcache-2.2.5
# /usr/local/php/bin/phpize
Configuring for:
PHP Api Version: 20090626
Zend Module Api No: 20090626
Zend Extension Api No: 220090626
# ./configure --enable-memcache --with-php-config=/usr/local/php/bin/php-config
# make && make install
安装成功后可能有这个报错：
Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-20090626/
修改php.ini文件，把php.ini中的extension_dir="./"修改成extension_dir="/usr/local/php/lib/php/extensions/no-debug-non-zts-20090626/"
然后添加下一行代码来载入memcached扩展
extension=memcache.so
测试memcache扩展是否成功，运行下面代码如果输出"Hello World!",表示成功
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