memcached编译安装及自启动

说明：
本篇实现memcached的编译安装及将memcached添加为系统服务以实现自启动

实现：
一.编译安装memcached

# yum install libevent libevent-devel -y //memcached借助libevent与客户端通信是来实现的，所以需要先安装libevent,libevent-devel
# cd /usr/local/src
# wget http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz
# tar -xvzf memcached-1.4.5.tar.gz
# cd memcached-1.4.5
# ./configure --prefix=/usr/local/memcached
# make && make install

 
至此，memcached就安装成功。可以以下方式开启memcached守护进程，使用默认端口11211

# /usr/local/memcached/bin/memcached -d -m 10 -u root -l 127.0.0.1 -p 11211 -c 64 -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，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，如果有多个地址的话，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

 
二.添加memcached为系统服务，实现自启动
1.拷贝memcached源码包的memcached.sysv拷贝到/etc/init.d，做为memcached的启动脚本

# cp /usr/local/src/memcached-1.4.5/scripts/memcached.sysv /etc/init.d/memcached //将memcached源码包的memcached.sysv拷贝到/etc/init.d，做为memcached的启动脚本

 
2.修改/etc/init.d/memcached

# vim /etc/init.d/memcached  //修改USER等，需要修改的都用//表示
#!/bin/sh
#
# chkconfig: - 55 45
# description:  The memcached daemon is a network memory cache service.
# processname: memcached
# config: /etc/sysconfig/memcached

# Source function library.
. /etc/rc.d/init.d/functions

PORT=11211
USER=root  //更改用户为root
MAXCONN=64
CACHESIZE=10
OPTIONS=""

if [ -f /etc/sysconfig/memcached ];then
    . /etc/sysconfig/memcached
fi

# Check that networking is up.
if [ "$NETWORKING" = "no" ]
then
    exit 0
fi

RETVAL=0
prog="memcached"

start () {
    echo -n $"Starting $prog: "
    # insure that /var/run/memcached has proper permissions
    # chown $USER /usr/local/memcached  //在此行前加#注释此行，感觉没用
    daemon /usr/local/memcached/bin/memcached -d -p $PORT -u $USER  -m $CACHESIZE -c $MAXCONN -P /tmp/memcached.pid $OPTIONS  //修改daemon memcached为daemon /usr/local/memcached/bin/memcached，不然/etc/init.d/memcached时会显示/bin/sh memcached command not found
    RETVAL=$?
    echo
    [ $RETVAL -eq 0 ] && touch /var/lock/subsys/memcached
}
stop () {
    echo -n $"Stopping $prog: "
    killproc memcached
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ] ; then
        rm -f /var/lock/subsys/memcached
        rm -f /var/run/memcached.pid
    fi
}

restart () {
    stop
    start
}


# See how we were called.
case "$1" in
    start)
        start
        ;;
    stop)
    stop
    ;;
    status)
    status memcached
    ;;
    restart|reload)
    restart
    ;;
    condrestart)
    [ -f /var/lock/subsys/memcached ] && restart || :
    ;;
    *)
    echo $"Usage: $0 {start|stop|status|restart|reload|condrestart}"
    exit 1
esac

exit $?

 
3.添加系统服务

# chmod 755 /etc/init.d/memcached
# chkconfig --add memcached  //没看出这句作用，知道的请务必留言告知，谢谢！
# chkconfig memcached on
# service memcached start  //开启memcached服务

 
附录：
附录1.在/etc/rc.d/rc.local中添加/usr/local/memcached/bin/memcached -d -m 10 -u root -l 127.0.0.1 -p 11211 -c 64 -P /tmp/memcached.pid也可以实现自启动