Memcached Debuging/Server Logs Monitor the Memcached Servers?
Solution 1
Define an additional variable in /etc/sysconfig/memcached
:
PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="64"
LOGFILE="/var/log/memcached.log"
OPTIONS=""
Edit the start()
function in the init script as belows:
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
}
then restart the memcached, you'll see something like this in the /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)
Don't forget to configure logrotate.
Solution 2
First, you are not showing memcached configuration, you are showing the startup script. You need to look for a file named like /etc/memcached.conf
. To enable logging, you need to uncomment the line
logfile /var/log/memcached.log
Also, you can increase the verbosity by enabling -v
or -vv
option.
If memcached is crashed, you can look into system logs /var/log/messages
and /var/log/syslog
to check for possible error conditions.
Related videos on Youtube
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Comments
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mahen3d almost 2 years
I have chat engine which is based on the Memcached variables, putting them into arrays and reading them in other end via jquery,
which works fine 95% of the times, however when the server load is high memcached (presume its the memcached) the crash and browser gets stucks up.
I dont think its jquery issue since this only happens when the server load is very high.
I need a way to monitor the memcached servers or somehow write a log file into where the fails/errors comes in...
Any idea on how i can do this ? or any idea why memcached servers fails ? I run the memcached as follows
$GLOBALS['MemCached'] = FALSE; $GLOBALS['MemCached'] = new Memcache; $GLOBALS['MemCached']->pconnect('localhost', 11211);
My memcached config is as follows
#! /bin/sh # # chkconfig: - 55 45 # description: The memcached daemon is a network memory cache service. # processname: memcached # config: /etc/sysconfig/memcached # pidfile: /var/run/memcached/memcached.pid # Standard LSB functions #. /lib/lsb/init-functions # Source function library. . /etc/init.d/functions PORT=11211 USER=memcached MAXCONN=1024 CACHESIZE=128 OPTIONS="" if [ -f /etc/sysconfig/memcached ];then . /etc/sysconfig/memcached fi # Check that networking is up. . /etc/sysconfig/network if [ "$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
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Greg Petersen almost 12 years
cat /etc/sysconfig/memcached
? -
mahen3d almost 12 yearsPORT="11211" USER="memcached" MAXCONN="20480" CACHESIZE="4096" OPTIONS=""
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mahen3d almost 12 yearsi dont have a file called memcached.conf in my system all i have is a file called .. /etc/sysconfig/memcached. PORT="11211" USER="memcached" MAXCONN="20480" CACHESIZE="4096" OPTIONS=""
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emhohensee over 8 yearsIn this case, as in mine, the configuration is in the init script itself. This is how the memcached.sysv init script ships when you install memcached from source.