Centos6.2安装Memcached详细教程

摘要: Memcache是一个高性能的分布式的内存对象缓存系统,通过在内存里维护一个统一的巨大的hash表,它能够用来存储各种格式的数据.简单的说就是将数据调用到内存中，然后从内存中读取，从而大大提高读取速度。
memcached是基于libevent的事件处理。libevent是个程序库，它将Linux的epoll、BSD类操作系统的kqueue等事件处理功能封装成统一的接口。即使对服务器的连接数增加，也能发挥O(1)的性能。 memcached使用这个libevent库，因此能在Linux、BSD、Solaris等操作系统上发挥其高性能。关于事件处理这里就不再详细介绍，可以参考Dan Ke...

安装Memcached步骤:

1.编译安装Libevent

cd ~

wget https://github.com/downloads/libevent/libevent/libevent-2.0.19-stable.tar.gz
tar -zxvf libevent-2.0.19-stable.tar.gz

cd libevent-2.0.19-stable

./configure --prefix=/usr/local/libevent/

make

make install

ln -s /usr/local/libevent/lib/libevent-2.0.so.5 /lib64/libevent-2.0.so.5

2.安装Memcache

cd ~

wget http://memcached.googlecode.com/files/memcached-1.4.13.tar.gz
tar -zxvf memcached-1.4.13.tar.gz

cd memcached-1.4.13

./configure --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent/

make

make install

3.编写memcached服务启停脚本

# cd /etc/init.d

vi memcached

脚本内容如下：

#!/bin/sh

# Startup script for the server of memcached

#http://blog.rekfan.com/?p=172

# processname: memcached

# pidfile: /usr/local/memcached/memcached.pid

# logfile: /usr/local/memcached/memcached_log.txt

# memcached_home: /etc/memcached

# chkconfig: 35 21 79

# description: Start and stop memcached Service

# Source function library

. /etc/rc.d/init.d/functions

RETVAL=0

prog="memcached"

basedir=/usr/local/memcached

cmd=${basedir}/bin/memcached

pidfile="$basedir/${prog}.pid"

#logfile="$basedir/memcached_log.txt"

# 设置memcached启动参数

ipaddr="192.168.6.60" # 绑定侦听的IP地址

port="11211" # 服务端口

username="root" # 运行程序的用户身份

max_memory=128 # default: 64M | 最大使用内存

max_simul_conn=1024 # default: 1024 | 最大同时连接数

#maxcon=51200

#growth_factor=1.3 # default: 1.25 | 块大小增长因子

#thread_num=6 # default: 4

#verbose="-vv" # 查看详细启动信息

#bind_protocol=binary # ascii, binary, or auto (default)

start() {

echo -n $"Starting service: $prog"

$cmd -d -m $max_memory -u $username -l $ipaddr -p $port -c $max_simul_conn -P $pidfile

RETVAL=$?

echo

[ $RETVAL -eq 0 ] && touch /var/lock/subsys/$prog

}

stop() {

echo -n $"Stopping service: $prog "

run_user=`whoami`

pidlist=`ps -ef | grep $run_user | grep memcached | grep -v grep | awk '{print($2)}'`

for pid in $pidlist

do

# echo "pid=$pid"

kill -9 $pid

if [ $? -ne 0 ]; then

return 1

fi

done

RETVAL=$?

echo

[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$prog

}

# See how we were called.

case "$1" in

start)

start

;;

stop)

stop

;;

#reload)

# reload

# ;;

restart)

stop

start

;;

#condrestart)

# if [ -f /var/lock/subsys/$prog ]; then

# stop

# start

# fi

# ;;

status)

status memcached

;;

*)

echo "Usage: $0 {start|stop|restart|status}"

exit 1

esac

exit $RETVAL

4.设置脚本可被执行：

# chmod +x memcached

# chkconfig --add memcached

# chkconfig --level 35 memcached on

5.设置防火墙

vi /etc/sysconfig/iptables

将下面这行加入进去

-A RH-Firewall-l-INPUT -p tcp -m tcp --dport 11211 -j ACCEPT

注：将memcached加入到防火墙允许访问规则中

service iptables restart

注：防火墙重启

6.启动memcached

# service memcached start

//启动的时候实际上是调用了下面的这个命令，以守护进程的方式来启动memcached

/usr/local/memcached/bin/memcached -d -m 64 -u root -l 192.168.1.101

-p 11211 -c 1024 -P /usr/local/memcached/memcached.pid

7.查看memcached是否启动：

# ps -ef | grep memcached