多个Memcached服务器的/etc/init.d启动脚本有效吗?

多个Memcached服务器的/etc/init.d启动脚本有效吗?

我通过源代码安装了 memcached 服务器,并可以为 1 个 memcached 服务器实例安装标准启动脚本,但通过谷歌尝试了几个脚本,找不到一个可以管理多个 memcached 服务器实例在启动时自动启动的脚本。我试过这两个脚本,但都不起作用,service memcached start 只是返回命令提示符,没有启动任何 memcached 服务器实例

  • lullabot.com/articles/installing-memcached-redhat-or-centos
  • addmoremem.blogspot.com/2010/09/running-multiple-instances-of-memcached.html

但是这个 bash 脚本可以运行但是在启动时却无法启动 memcached 实例?

#!/bin/sh
case "$1" in
start)
/usr/local/bin/memcached -d -m 16 -p 11211 -u nobody
/usr/local/bin/memcached -d -m 16 -p 11212 -u nobody
;;
stop) killall memcached
;;
esac

操作系统:Centos 5.5 64位 Memcached = v1.4.5 Memcache = v2.2.5

有人能告诉我一个可以运行的 /etc/init.d/ 启动脚本来管理多个 memcached 服务器吗?谢谢

编辑:谢谢 mat,这是最终有效的代码

#!/bin/sh
# chkconfig: - 80 12
# description:  The memcached daemon is a network memory cache service.
# processname: memcached
BIN=/usr/local/bin/memcached
USER=nobody
CON=2048
THREADS=4

$BIN -d -m 16 -p 11211 -c $CON -t $THREADS -u $USER
$BIN -d -m 16 -p 11212 -c $CON -t $THREADS -u $USER

case "$1" in
start)
$BIN -d -m 16 -p 11211 -c $CON -t $THREADS -u $USER
$BIN -d -m 16 -p 11212 -c $CON -t $THREADS -u $USER
;;
stop) killall $BIN
;;
esac

答案1

要将服务添加到 chkconfig,通常需要在 shell 脚本的 shebang 下添加几个特殊注释:

#!/bin/sh
# chkconfig: - 55 45
# description:  The memcached daemon is a network memory cache service.
# processname: memcached

在 /etc/init.d/memcached 中添加行后,您可以发出

chkconfig --add memcached

当然,进程还可以在其他运行级别启动,因此,为了检查是否可以启动,您需要执行

chkconfig --list | grep "memcached"

memcached 的常见运行级别是

chkconfig --level 345 memcached on

答案2

下面是我用来启动多个 memcached 实例的脚本。关键点是我使用关联数组来启动所有实例或仅启动一个特定实例:

#! /usr/local/bash4/bin/bash
#
# chkconfig: - 55 45
# description:  The memcached daemon is a network memory cache service.
# processname: memcached
# config: /etc/sysconfig/memcached

# Standard LSB functions
#. /lib/lsb/init-functions

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

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

# Check that networking is up.
. /etc/sysconfig/network

if [ "$NETWORKING" = "no" ]
then
    exit 0
fi

typeset -A PIDS
typeset -A MEMORYS
typeset -A FACTORS
typeset -A INSTANCES

PORTS="11216 11217"
USER=memcached
basedir="/usr/local/memcached"
MAXCONN=1024
OPTIONS=""
INSTANCES=([11216]="session" [11217]="userdata")
PIDS=([11216]="$basedir/var/run/sohaphimdetails.pid" [11217]="$basedir/var/run/sohamuzik-top.pid")
MEMORYS=([11216]="1024" [11217]="2048")
FACTORS=([11216]="1.25" [11217]="1.125")

RETVAL=0
prog="memcached"
cmd="/usr/local/memcached/bin/memcached"
user="memcached"
ip="192.168.6.66"
peer="192.168.6.28"
max_conn=2048
max_memory=512
threads=8

function start()
{
    port="$1"
    if [ `ps -ef | grep "$cmd" | grep -c $port` -ge 1 ]; then
        action $"Starting the memcached server on port '$port'... " /bin/false
    else
        if [ ! -f $basedir/var/log/${INSTANCES[$port]}.log ]; then 
            touch $basedir/var/log/${INSTANCES[$port]}.log 
            /bin/chown memcached:memcached $basedir/var/log/${INSTANCES[$port]}.log
        fi
        $cmd -d -u $user -l $ip -c $max_conn -t $threads -m ${MEMORYS[$port]} -p $port -P $basedir/var/run/${INSTANCES[$port]}.pid -f ${FACTORS[$port]} -x $peer -X `expr $port '*' 10` -vv > $basedir/var/log/${INSTANCES[$port]}.log 2>&1
        action $"Starting the memcached server on port '$port'... " /bin/true
    fi
}

function stop()
{
    port="$1"
    if [ `ps -ef | grep "$cmd" | grep -c $port` -eq 0 ]; then
        action $"Stopping the memcached server on port '$port'... " /bin/false
    else
        kill -TERM `ps -ef | grep "$cmd" | grep $port | grep -v grep | awk '{ print $2 }'`
        action $"Stopping the memcached server on port '$port'... " /bin/true 
    fi
}

case "$1" in
    start) 
        if [ -n "$2" ]; then
            start $2
        else
            for port in $PORTS; do
                start $port
            done
        fi
        ;;
    stop)   
        if [ -n "$2" ]; then
            port="$2"
            stop $port
        else
            killproc $prog
        fi
        ;;
    restart)
        if [ -n "$2" ]; then
            stop $2
            start $2
        else
            for port in $PORTS; do
                stop $port
                start $port
            done
        fi
        ;;
    *)
        printf 'Usage: %s {start|stop|restart} <port>\n' "$prog"
        exit 1
        ;;
esac

附言:我用过复制缓存进行复制。

答案3

由于脚本正在运行,我假设它没有从 /etc/rc.d 链接,因此在启动时不会执行。假设您的启动脚本名为 /etc/init.d/memcached,您应该执行

chkconfig --add memcached

将其添加到启动时运行的脚本列表中。

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