由于CentOS5有一个memcached的安装包，如果要玩memcached，就直接找到memcached-1.4.5-1.el5.kb.i386.rpm下载安装了。
memcachedb麻烦一些，虽然有为openSUSE弄好的包（memcachedb-1.0.4-2.1.i586），但由于RHEL5.5的C++库太老，没办法安装，只能从源代码编译起了。我的安装基本上基于一个很干净的RHEL5.5。
安装的过程可以参考。稍有不同的是，libevent这个包，RHEL5.5里的已经足够了，因此要做的就是编译安装db4.7和memcachedb1.2.1beta。注意，在装了前者之后，需要执行echo “/usr/local/BerkeleyDB.4.7/lib/” >> /etc/ld.so.conf.d/db4.7.ld.so.conf和ldconfig，才能让memcachedb找到新版的berkeley db。
RHEL5.5事实上也带db4的，不过版本较老，为4.3，memcachedb1.2.x不能够支持。当我install了4.7之后，发现这也不会有冲突。因为install的目标目录是/usr/local/BerkeleyDB.4.7/，而系统rpm包包含的db4有这些内容：
/lib/libdb-4.3.so/usr/lib/libdb-4.3.so/usr/lib/libdb_cxx-4.3.so/usr/share/doc/db4-4.3.29/usr/share/doc/db4-4.3.29/LICENSE/usr/share/doc/db4-4.3.29/README
两者是可以共存的:-)
编译好了memcachedb，要弄一个/etc/init.d/memcachedb脚本，，让service将memcachedb管理起来：
?
#! /bin/sh## chkconfig: – 55 45# description: The memcachedb daemon is a network memory cache service backing by berkeley db.# processname: memcachedb# config: /etc/sysconfig/memcachedb# pidfile: /var/run/memcachedb/memcachedb.pid# Standard LSB functions#. /lib/lsb/init-functions# Source function library.. /etc/init.d/functionsPORT=22222USER=rootOPTIONS=””DATADIR=/var/mcdb_dataPROCESSID=/var/run/memcachedb/memcachedb.pidPROCESSIDDIR=`dirname $PROCESSID`if [ -f /etc/sysconfig/memcachedb ];then. /etc/sysconfig/memcachedbfi# Check that networking is up.. /etc/sysconfig/networkif [ “$NETWORKING” = “no” ]thenexit 0fiRETVAL=0prog=”memcachedb”start () {echo -n $”Starting $prog: “if [ ! -d $PROCESSIDDIR ]; thenmkdir $PROCESSIDDIR -pfi# insure that /var/run/memcachedb has proper permissionsif [ “`stat -c %U $PROCESSIDDIR`” != “$USER” ]; thenchown $USER $PROCESSIDDIRfidaemon –pidfile $PROCESSID /usr/local/bin/memcachedb -d -p $PORT -r -u $USER -H $DATADIR -P $PROCESSID $OPTIONSRETVAL=$?echo[ $RETVAL -eq 0 ] && touch /var/lock/subsys/memcachedb}stop () {echo -n $”Stopping $prog: “killproc -p $PROCESSID /usr/local/bin/memcachedbRETVAL=$?echoif [ $RETVAL -eq 0 ] ; thenrm -f /var/lock/subsys/memcachedbrm -f $PROCESSIDfi}restart () {stopstart}# See how we were called.case “$1″ instart)start;;stop)stop;;status)status /usr/local/bin/memcachedb;;restart|reload|force-reload)restart;;condrestart)[ -f /var/lock/subsys/memcachedb ] && restart || :;;*)echo $”Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart}”exit 1esacexit $?同时提供在/etc/sysconfig/下的配置文件memcachedb
PORT=”22222″
USER=”root”
OPTIONS=””
DATADIR=”/var/mcdb_data”
PROCESSID=”/var/run/memcachedb/memcachedb.pid”
人生的成功不过是在紧要处多一份坚持，
