64位centOS6.4系统安装memcached

64位centOS6.4系统安装memcached

1.先下载相关资源libevent 和 memcached；
#cd /temp
#wget http://monkey.org/~provos/libevent-2.0.10-stable.tar.gz #wget http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz
2.判断系统是否已经安装了libevent
#rpm -qa | grep libevent
输出：libevent-1.1a-3.2.1
#rpm -e --nodeps libevent-1.1a-3.2.1（删除低版本，安装2.0.10）

3.安装libevent
#tar xvzf libevent-2.0.10-stable.tar.gz
#cd libevent-2.0.10-stable
#./configure -prefix=/usr (安装路径/usr/lib)
#make
#make install
#ls -a /usr/lib | grep libevent (测试是否安装上)

4.安装memcached
#tar xvzf memcached-1.4.5.tar.gz
#cd memcached-1.4.5
#./configure -with-libevent=/usr （默认安装/usr/local/bin/memcached）
#make
#make install

5.以上已安装完毕，现在开始启动
#memcached -d -m 128 -l localhost -p 11211 -u root
有可能出错（未加载libevent-2.0.so.5，启动失败）：
memcached: error while loading shared libraries: libevent-2.0.so.5: cannot open shared object file: No such file or directory

解决方式：
查看memcached寻找libevent-2.0.so.5模块的路径
#LD_DEBUG=libs memcached -v
28788: find library=libevent-2.0.so.5 [0]; searching
28788: search cache=/etc/ld.so.cache
28788: search path=/lib64/tls/x86_64:/lib64/tls:/lib64/x86_64:/lib64:/usr/lib64/tls/x86_64:/usr/lib64/tls:/usr/lib64/x86_64:/usr/lib64 (system search path)
28788: trying file=/lib64/tls/x86_64/libevent-2.0.so.5
28788: trying file=/lib64/tls/libevent-2.0.so.5
28788: trying file=/lib64/x86_64/libevent-2.0.so.5
28788: trying file=/lib64/libevent-2.0.so.5
28788: trying file=/usr/lib64/tls/x86_64/libevent-2.0.so.5
28788: trying file=/usr/lib64/tls/libevent-2.0.so.5
28788: trying file=/usr/lib64/x86_64/libevent-2.0.so.5
28788: trying file=/usr/lib64/libevent-2.0.so.5
28788:
memcached: error while loading shared libraries: libevent-2.0.so.5: cannot open shared object file: No such file or directory

从上面的内容可看到memcached是从哪些路径里面去寻找libevent-2.0.so.5的，随便找一个路径，软链接过去即可

#ln -s /usr/lib/libevent-2.0.so.5 /usr/lib64/libevent-2.0.so.5
#memcached -d -m 128 -l localhost -p 11211 -u root
# ps -ef | grep memcached
root 28914 1 0 07:27 ? 00:00:00 memcached -d -m 128 -l localhost -p 11211 -u root (启动ok)

6.测试memcached
#telnet localhost 11211
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
set foo 0 0 3 （保存命令）
bar （数据）
STORED （结果）
get foo （取得命令）
VALUE foo 0 3 （数据）
bar （数据）

备注：
1.启动Memcache的服务器端：
# /usr/local/bin/memcached -d -m 10 -u root -l 192.168.0.200 -p 12000 -c 256 -P /tmp/memcached.pid

-d选项是启动一个守护进程，
-m是分配给Memcache使用的内存数量，单位是MB，默认64MB, 我这里是10MB，
-u是运行Memcache的用户，我这里是root，
-l是监听的服务器IP地址，默认为所有网卡。 我这里指定了服务器的IP地址192.168.0.200，
-p是设置Memcache监听的端口，我这里设置了12000，最好是1024以上的端口，
-c选项是最大运行的并发连接数，默认是1024，我这里设置了256，按照你服务器的负载量来设定，
-P是设置保存Memcache的pid文件，我这里是保存在 /tmp/memcached.pid，

-p 使用的TCP端口。默认为11211
-m 最大内存大小。默认为64M
-vv 用very vrebose模式启动，调试信息和错误输出到控制台
-d 作为daemon在后台启动

2.如果要结束Memcache进程，执行：

# kill `cat /tmp/memcached.pid`

或是 通过ps -ef | grep memcached 找到pid ，然后kill

也可以启动多个守护进程，不过端口不能重复。

Memcache开机启动脚本:

#!/bin/sh
#
# memcached:    MemCached root
#
# chkconfig:    - 90 25
# description:  MemCached root
#
# Source function library.

. /etc/rc.d/init.d/functions
. /etc/sysconfig/network

#[ ${NETWORKING} = "no" ] && exit 0
#[ -r /etc/sysconfig/dund ] || exit 0
#. /etc/sysconfig/dund
#[ -z "$DUNDARGS" ] && exit 0

MEMCACHED="/usr/local/bin/memcached"
SERVER_IP="192.168.56.101" #你的IP地址
SERVER_PORT="11211"

[ -f $MEMCACHED ] || exit 1

start()
{
echo -n $"Starting memcached: "
$MEMCACHED -u root -d -m 2048 -l $SERVER_IP -p $SERVER_PORT -P /tmp/memcached.pid
echo
}
stop()
{
echo -n $"Shutting down memcached: "
killproc memcached
echo
}

# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
sleep 3
start
;;
*)
echo $"Usage: $0 {start|stop|restart}"
exit 1
esac
exit 0