CentOS7编译安装memcached

紧接上一篇http://assen.iteye.com/admin/blogs/2352416，本篇主要是memcached的安装与配置(建立在上一篇的系统配置上)，安装包版本memcached-1.4.31.tar.gz。

第一步：安装libevent函数库
下载地址：https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz，上传服务器后解压。定位到解压后的根目录，执行如下编译命令：
#./configure -prefix=/usr/local/mysoft/libevent-2.0.21
说明：-prefix指定到libevent函数库需要安装到的目录
编译完成之后，解压包的根目录底下执行安装命令：
# make && make install && 
# echo "安装libevent完毕！"
检验是否安装成功，定位到安装后的目录，执行如下命令：
[root@localhost libevent-2.0.21]# ls -al lib | grep libevent
或者
[root@localhost /]# ls -al /usr/local/mysoft/libevent-2.0.21/lib | grep libevent
能看到如下信息表示安装成功

lrwxrwxrwx. 1 root root      21 Jan 12 10:54 libevent-2.0.so.5 -> libevent-2.0.so.5.1.9
-rwxr-xr-x. 1 root root 1140035 Jan 12 10:54 libevent-2.0.so.5.1.9
-rw-r--r--. 1 root root 2222058 Jan 12 10:54 libevent.a
lrwxrwxrwx. 1 root root      26 Jan 12 10:54 libevent_core-2.0.so.5 -> libevent_core-2.0.so.5.1.9
-rwxr-xr-x. 1 root root  690230 Jan 12 10:54 libevent_core-2.0.so.5.1.9
-rw-r--r--. 1 root root 1394122 Jan 12 10:54 libevent_core.a
-rwxr-xr-x. 1 root root    1003 Jan 12 10:54 libevent_core.la
lrwxrwxrwx. 1 root root      26 Jan 12 10:54 libevent_core.so -> libevent_core-2.0.so.5.1.9
lrwxrwxrwx. 1 root root      27 Jan 12 10:54 libevent_extra-2.0.so.5 -> libevent_extra-2.0.so.5.1.9
-rwxr-xr-x. 1 root root  471855 Jan 12 10:54 libevent_extra-2.0.so.5.1.9
-rw-r--r--. 1 root root  828008 Jan 12 10:54 libevent_extra.a
-rwxr-xr-x. 1 root root    1010 Jan 12 10:54 libevent_extra.la
lrwxrwxrwx. 1 root root      27 Jan 12 10:54 libevent_extra.so -> libevent_extra-2.0.so.5.1.9
-rwxr-xr-x. 1 root root     968 Jan 12 10:54 libevent.la
lrwxrwxrwx. 1 root root      30 Jan 12 10:54 libevent_pthreads-2.0.so.5 -> libevent_pthreads-2.0.so.5.1.9
-rwxr-xr-x. 1 root root   23963 Jan 12 10:54 libevent_pthreads-2.0.so.5.1.9
-rw-r--r--. 1 root root   21942 Jan 12 10:54 libevent_pthreads.a
-rwxr-xr-x. 1 root root    1031 Jan 12 10:54 libevent_pthreads.la
lrwxrwxrwx. 1 root root      30 Jan 12 10:54 libevent_pthreads.so -> libevent_pthreads-2.0.so.5.1.9
lrwxrwxrwx. 1 root root      21 Jan 12 10:54 libevent.so -> libevent-2.0.so.5.1.9

第二步：安装memcached
下载地址：https://github.com/memcached/memcached/wiki/ReleaseNotes，下载版本memcached-1.4.31.tar.gz解压，定位到解压后的根目录，执行如下编译命令：
#./configure -prefix=/usr/local/mysoft/memcached
#--with-libevent=/usr/local/mysoft/libevent-2.0.21
说明：-prefix指定到memcached需要安装到的目录，
--with-libevent就是第一步libevent函数库安装的目录

编译完成之后，解压包的根目录底下执行安装命令：
# make && make install && 
# echo "安装memcached完毕！"
安装完后/usr/local/mysoft/memcached目录底下有bin、include、share三个文件夹，此时已安装成功。

第三步：设置启动脚本、开机自启memcached:
Xshell进入系统根目录，执行如下命令 vi /etc/init.d/memcached，创建脚本，目录需指定到/etc/init.d/底下。脚本命令：

#! /bin/bash
# memcached:    MemCached Daemon   
# chkconfig:    - 90 25  
# description:  MemCached Daemon   

#端口
PORT=11211
#启动用户
USER=root
#最大连接数
MAXCONN=65535
# 最大内存使用
# 留空将自动计算内存值;物理内存－512MB
CACHESIZE=512
OPTIONS=""
#memcache安装目录
memcached_location="/usr/local/mysoft/memcached"

RETVAL=0
prog="memcached"


# 留空将自动计算内存值;物理内存－512MB
if [ ".${CACHESIZE}" == "." ] ; then
   mem_size=`free -m | grep "^Mem:" | awk '{print $2}'`
   CACHESIZE=$(( ${mem_size} - 512 ))
fi

start () {
    echo -n $"Starting $prog: "
    if [ ! -f "/var/run/memcached.pid" ] ; then
       touch /var/run/memcached.pid
       chown ${USER}.${USER} /var/run/memcached.pid
    fi
    $memcached_location/bin/memcached -d -p $PORT -u $USER -m $CACHESIZE -c $MAXCONN -P /var/run/memcached.pid $OPTIONS
    RETVAL=$?
    echo
        [ ! -d "/var/lock/subsys" ] && mkdir -p /var/lock/subsys/
    [ $RETVAL -eq 0 ] && touch /var/lock/subsys/memcached
}

stop () {
    echo -n $"Stopping $prog: "
    if [ ! -f "/var/run/memcached.pid" ] ; then
       echo "memcached not running!"
       exit 1 ;
    fi
    kill `cat /var/run/memcached.pid`
    RETVAL=$?
    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
    ;;
    restart|reload)
    restart
    ;;
    *)
    echo $"Usage: $0 {start|stop|status|restart|reload}"
    exit 1
esac

exit $?

参数说明：
PORT：memcached端口，默认11211
USER：系统用户，默认root
MAXCONN：最大可连接数，根据实际配置
CACHESIZE：缓存大小，根据实际设置
memcached_location：memcached安装成功的目录
memcached.pid文件建议放在/var/run/底下


第四步：添加到服务 
依次执行如下命令：
chmod a+x /etc/init.d/memcached
chkconfig --add memcached
chkconfig nginx on
/etc/init.d/memcached start

最后使用命令：
$ service memcached start 
$ service memcached stop 
$ service memcached restart 
$ service memcached reload 
 
$ /etc/init.d/memcached start 
$ /etc/init.d/memcached stop 
$ /etc/init.d/memcached restart 
$ /etc/init.d/memcached reload