Memcached 调试/服务器日志监控 Memcached 服务器？

Question

我有基于 Memcached 变量的聊天引擎，将它们放入数组并通过 jquery 在另一端读取它们，

它在 95% 的情况下都可以正常工作，但是当服务器负载很高时 memcached（假设它是 memcached）崩溃和浏览器卡住了。

我不认为它的 jquery 问题，因为这只发生在服务器负载非常高的时候。

我需要一种方法来监视 memcached 服务器或以某种方式将日志文件写入失败/错误所在的位置...

关于我如何做到这一点的任何想法？或者知道为什么 memcached 服务器会失败？我按如下方式运行 memcached

$GLOBALS['MemCached'] = FALSE;
$GLOBALS['MemCached'] = new Memcache;
$GLOBALS['MemCached']->pconnect('localhost', 11211);

我的 memcached 配置如下

#! /bin/sh
#
# chkconfig: - 55 45
# description:  The memcached daemon is a network memory cache service.
# processname: memcached
# config: /etc/sysconfig/memcached
# pidfile: /var/run/memcached/memcached.pid

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

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

PORT=11211
USER=memcached
MAXCONN=1024
CACHESIZE=128
OPTIONS=""

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

RETVAL=0
prog="memcached"
pidfile=${PIDFILE-/var/run/memcached/memcached.pid}
lockfile=${LOCKFILE-/var/lock/subsys/memcached}

start () {
    echo -n $"Starting $prog: "
    # Ensure that /var/run/memcached has proper permissions
    if [ "`stat -c %U /var/run/memcached`" != "$USER" ]; then
        chown $USER /var/run/memcached
    fi

    daemon --pidfile ${pidfile} memcached -d -p $PORT -u $USER  -m $CACHESIZE -c $MAXCONN -P ${pidfile} $OPTIONS
    RETVAL=$?
    echo
    [ $RETVAL -eq 0 ] && touch ${lockfile}
}
stop () {
    echo -n $"Stopping $prog: "
    killproc -p ${pidfile} /usr/bin/memcached
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ] ; then
        rm -f ${lockfile} ${pidfile}
    fi
}

restart () {
        stop
        start
}


# See how we were called.
case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    status -p ${pidfile} memcached
    RETVAL=$?
    ;;
  restart|reload|force-reload)
    restart
    ;;
  condrestart|try-restart)
    [ -f ${lockfile} ] && restart || :
    ;;
  *)
    echo $"Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart|try-restart}"
    RETVAL=2
        ;;
esac

exit $RETVAL

Answer 1

首先，您没有显示 memcached 配置，而是显示了启动脚本。您需要查找名为 like 的文件/etc/memcached.conf。要启用日志记录，您需要取消注释该行

logfile /var/log/memcached.log

此外，您可以通过启用-v或-vv选项来增加详细程度。

如果 memcached 崩溃，您可以查看系统日志/var/log/messages并/var/log/syslog检查可能的错误情况。

Answer 2

在 中定义一个额外的变量/etc/sysconfig/memcached：

PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="64"
LOGFILE="/var/log/memcached.log"
OPTIONS=""

编辑start()init 脚本中的函数如下：

start () {
    #echo -n $"Starting $prog: "
    # insure that /var/run/memcached has proper permissions
    if [ "`stat -c %U /var/run/memcached`" != "$USER" ]; then
        chown $USER /var/run/memcached
    fi

    #daemon --pidfile /var/run/memcached/memcached.pid memcached -d -p $PORT -u $USER  -m $CACHESIZE -c $MAXCONN -P /var/run/memcached/memcached.pid $OPTIONS -vv > $LOGFILE 2>&1
    $prog -d -p $PORT -u $USER  -m $CACHESIZE -c $MAXCONN -P /var/run/memcached/memcached.pid $OPTIONS -vv > $LOGFILE 2>&1
    RETVAL=$?
    #echo
    [ $RETVAL -eq 0 ] && action $"Starting $prog: " /bin/true && touch /var/lock/subsys/memcached
}

然后重新启动 memcached，您将在以下内容中看到类似的内容/var/log/memcached.log：

slab class  40: chunk size    616944 perslab       1
slab class  41: chunk size    771184 perslab       1
slab class  42: chunk size   1048576 perslab       1
<26 server listening (auto-negotiate)
<27 server listening (auto-negotiate)
<28 send buffer was 129024, now 268435456
<29 send buffer was 129024, now 268435456
<28 server listening (udp)
<29 server listening (udp)

不要忘记配置 logrotate。