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by Gordon Franke
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Jul 29, 2009

Wie kann ich mehrere Instanzen von memcached auf einem Server laufen lassen?

Problem

Ich brauche mehr als einen Memcached Server.

Lösung

Virtuellemaschinen

Ich kann für jeden memcached server eine Virtuellemaschine erstellen.

Probleme

  • mehr speicher (system+memcached)
  • eine ip addresse pro Instanz
  • mehr Aufwand

Multiple Instanzen mithilfe von Ports

Dafür müssen die Skripte init.d und start-memcached gepatched werden um Multiple Instanzen zum laufen zubekommen.

Nach dem patch sucht es nach Konfigurationsdateien die folgendem Muster entsprechen /etc/memcached_*.conf. Wenn es keine Dateien findet benutzt es die /etc/memcached.conf Konfigurationsdatei. Es ist also rückwärtskompatibel.

Wenn du nun 2 memached Instanzen erstellen möchtest kopiere die Konfigurationsdatei und ändere den Port, Speicher …

cp /etc/memcached.conf /etc/memcached_myserver_1.conf
cp /etc/memcached.conf /etc/memcached_myserver_2.conf

Befehle

startet alle Server

/etc/init.d/memcached start

startet nur einen bestimmten Server

/etc/init.d/memcached start myserver_1

stopt alle Server

/etc/init.d/memcached stop

stopt nur einen bestimmten Server

/etc/init.d/memcached stop myserver_1

Die Änderungen

/usr/share/memcached/scripts/start-memcached

26,30d25
> if (scalar(@ARGV) == 2) {
> 	$etcfile = shift(@ARGV);
> 	$pidfile = shift(@ARGV);
> }
>

/etc/init.d/memcached

16a17
> DAEMONNAME=memcached
18d18
< NAME=memcached
20d19
< PIDFILE=/var/run/$NAME.pid
26a26,63
> FILES=(/etc/memcached_*.conf);
> # check for alternative config schema
> if [ -r "${FILES[0]}" ]; then
>   CONFIGS=();
>   for FILE in "${FILES[@]}";
>   do
>     # remove prefix
>     NAME=${FILE#/etc/};
>     # remove suffix
>     NAME=${NAME%.conf};
>
>     # check optional second param
>     if [ $# -ne 2 ];
>     then
>       # add to config array
>       CONFIGS+=($NAME);
>     elif [ "memcached_$2" == "$NAME" ];
>     then
>       # use only one memcached
>       CONFIGS=($NAME);
>       break;
>     fi;
>   done;
>
>   if [ ${#CONFIGS[@]} == 0 ];
>   then
>     echo "Config not exist for: $2" >&2;
>     exit 1;
>   fi;
> else
>   CONFIGS=(memcached);
> fi;
>
> CONFIG_NUM=${#CONFIGS[@]};
> for ((i=0; i < $CONFIG_NUM; i++)); do
>   NAME=${CONFIGS[${i}]};
>   PIDFILE="/var/run/${NAME}.pid";
>
30c67
<       start-stop-daemon --start --quiet --exec $DAEMONBOOTSTRAP
---
>       start-stop-daemon --start --quiet --exec "$DAEMONBOOTSTRAP" -- /etc/${NAME}.conf $PIDFILE
50c87
<       start-stop-daemon --start --quiet --exec $DAEMONBOOTSTRAP
---
>       start-stop-daemon --start --quiet --exec "$DAEMONBOOTSTRAP" -- /etc/${NAME}.conf $PIDFILE
54c91
<       N=/etc/init.d/$NAME
---
>       N=/etc/init.d/$DAEMONNAME
59a97
> done;

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Category: Uncategorized, unix

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23 Responses

  1. Dave sagt:
    %A, 29UTCTue, 29 Sep 2009 01:09:33 +0000 %e. %B %Y um %H:%M

    Could you post the full files or email me the 2 files? I’m having some problems when trying to run the patch

  2. Damian Casale sagt:
    %A, 05UTCMon, 05 Oct 2009 14:27:04 +0000 %e. %B %Y um %H:%M

    FYI

    Make sure you check line 1 on /etc/init.d/memcached

    it should be :

    #! /bin/bash

    not

    #! /bin/sh

    else the code will not work.

  3. sahid sagt:
    %A, 08UTCThu, 08 Oct 2009 15:09:15 +0000 %e. %B %Y um %H:%M

    Very nice,
    thanks

  4. Chris sagt:
    %A, 21UTCWed, 21 Oct 2009 08:24:12 +0000 %e. %B %Y um %H:%M

    Welche Version von Memcached wurde hier gepatched? Ich arbeite gerade an 1.4.2. und es scheint nicht zusammen zu passen.

  5. John sagt:
    %A, 29UTCThu, 29 Oct 2009 07:56:42 +0000 %e. %B %Y um %H:%M

    Unfortunately i can’t get that to work. How do you apply the patch files? I tried it by hand but there seems to be an error. all i get is a

    /etc/init.d/memcached: line 100: syntax error near unexpected token `;’

    that’s weird. I should have patched this automatically but this isn’t a diff-file is it?

  6. Mike sagt:
    %A, 24UTCMon, 24 May 2010 22:45:54 +0000 %e. %B %Y um %H:%M

    Looks like the patch has a tiny syntax bug-

    > CONFIG_NUM=${#CONFIGS[@]};
    > for ((i=0; i NAME=${CONFIGS[${i}]};
    > PIDFILE=”/var/run/${NAME}.pid”;

    should be

    > CONFIG_NUM=${#CONFIGS[@]};
    > for ((i=0; i NAME=${CONFIGS[${i}]};
    > PIDFILE=”/var/run/${NAME}.pid”;
    > done

    Note the done

  7. Gordon Franke sagt:
    %A, 27UTCThu, 27 May 2010 09:21:04 +0000 %e. %B %Y um %H:%M

    have you apply this patch? i think the “done” is in line 59

  8. Andrew sagt:
    %A, 13UTCTue, 13 Jul 2010 13:31:42 +0000 %e. %B %Y um %H:%M

    Hello,

    How is one supposed to use the code provided in the patch windows?

    Regards

    Andrew

  9. Gordon Franke sagt:
    %A, 13UTCTue, 13 Jul 2010 14:16:32 +0000 %e. %B %Y um %H:%M

    You can use the command patch or manually change the files.

  10. Andrew sagt:
    %A, 13UTCTue, 13 Jul 2010 14:23:36 +0000 %e. %B %Y um %H:%M

    I had googled this page: http://linux.about.com/od/commands/l/blcmdl1_patch.htm

    I am new to using the patch command so bear with me! I created a file on my server called diff1 containing the code for /usr/share/memcached/scripts/start-memcached. I then created a backup of my start-memcached. When I run patch start-memcached.bak < diff1, I receive this error message:

    patching file start-memcached.bak
    patch: **** `<' expected at line 2 of patch

    Am I doing something stupid?

    Regards

    Andrew

  11. Gordon Franke sagt:
    %A, 13UTCTue, 13 Jul 2010 14:40:42 +0000 %e. %B %Y um %H:%M

    which version of memcache you use?

  12. Joseph Crawford sagt:
    %A, 28UTCWed, 28 Jul 2010 19:16:56 +0000 %e. %B %Y um %H:%M

    I am currently using memcached 1.4.2-1ubuntu3 and these patches will not work for me at all. on the first patch I keep getting this error: patch: **** ` was expected, this was caused by there not being a space after those such as ‘> ‘. I fixed that and got the above errors.

    Any assistance?
    Joseph Crawford´s last [type] ..Repairing the Oil Pan on my 2006 Katana 600

  13. UndiFineD sagt:
    %A, 29UTCThu, 29 Jul 2010 15:09:16 +0000 %e. %B %Y um %H:%M

    #full /etc/init.d/memcached for my ubuntu 10.04+

    #! /bin/bash
    ### BEGIN INIT INFO
    # Provides: memcached
    # Required-Start: $syslog
    # Required-Stop: $syslog
    # Should-Start: $local_fs
    # Should-Stop: $local_fs
    # Default-Start: 2 3 4 5
    # Default-Stop: 0 1 6
    # Short-Description: memcached – Memory caching daemon
    # Description: memcached – Memory caching daemon
    ### END INIT INFO

    PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
    DAEMON=/usr/bin/memcached
    DAEMONBOOTSTRAP=/usr/share/memcached/scripts/start-memcached
    DAEMONNAME=memcached
    DESC=memcached
    PIDFILE=/var/run/$NAME.pid
    FILES=(/etc/memcached_*.conf);
    if [ -r "${FILES[0]}” ]; then
    CONFIGS=();
    for FILE in “${FILES[@]}”;
    do
    # remove prefix
    NAME=${FILE#/etc/};
    # remove suffix
    NAME=${NAME%.conf};

    # check optional second param
    if [ $# -ne 2 ];
    then
    # add to config array
    CONFIGS+=($NAME);
    elif [ "memcached_$2" == "$NAME" ];
    then
    # use only one memcached
    CONFIGS=($NAME);
    break;
    fi;
    done;

    if [ ${#CONFIGS[@]} == 0 ];
    then
    echo “Config not exist for: $2″ >&2;
    exit 1;
    fi;
    else
    CONFIGS=(memcached);
    fi;

    CONFIG_NUM=${#CONFIGS[@]};
    for ((i=0; i &2
    exit 1
    ;;
    esac

    exit 0

  14. Jon sagt:
    %A, 10UTCTue, 10 Aug 2010 06:39:58 +0000 %e. %B %Y um %H:%M

    Here are the complete patched files for Ubuntu 8.04.
    http://gist.github.com/516746

  15. xSmurf sagt:
    %A, 11UTCWed, 11 Aug 2010 22:19:08 +0000 %e. %B %Y um %H:%M

    Awesome tip, thank very much for the info!

  16. flo sagt:
    %A, 24UTCFri, 24 Sep 2010 10:19:17 +0000 %e. %B %Y um %H:%M

    small Fix:
    use:
    FILES=(/etc/memcached*.conf);
    instead of:
    FILES=(/etc/memcached_*.conf);
    to also hit the standard-configfile

    and simply add the line:
    start-stop-daemon –stop –quiet –oknodo –pidfile $PIDFILE
    whenever a serverstop is invoked.

  17. flo sagt:
    %A, 24UTCFri, 24 Sep 2010 10:20:37 +0000 %e. %B %Y um %H:%M

    forget the “start-stop-daemon –stop –quiet –oknodo –pidfile $PIDFILE” Line cause its already there ;)

  18. Gordon Franke sagt:
    %A, 06UTCWed, 06 Oct 2010 11:24:54 +0000 %e. %B %Y um %H:%M

    i have forked the gist and make some small improvements http://gist.github.com/612961.

    tested under:
    ubuntu and memcache 1.4.5
    debian lenny memcache 1.4.5

  19. Kaanon sagt:
    %A, 24UTCWed, 24 Nov 2010 22:55:10 +0000 %e. %B %Y um %H:%M

    You guys are lifesavers, I didn’t want to have to write this myself!

    Works perfectly!!!!!!

  20. Aleka sagt:
    %A, 06UTCThu, 06 Jan 2011 22:31:53 +0000 %e. %B %Y um %H:%M

    Thanks for your scripts, I have tested it in Debian lenny – memcached 1.4.5-1 and Works perfectly.

    But, It would be possible to run more than 2 instances of memcache?.
    If so, what should I change in the scripts?

  21. Gordon Franke sagt:
    %A, 07UTCFri, 07 Jan 2011 09:33:30 +0000 %e. %B %Y um %H:%M

    simple add another memcache config file. you are only limited on ram and ports ;) so i run 22 memcache instances on one server

  22. Aleka sagt:
    %A, 08UTCTue, 08 Feb 2011 22:33:28 +0000 %e. %B %Y um %H:%M

    Thanks for your answer!

    In this regard. Can I do some questions?

    1. Do you know any tool that allows me to make monitoring multiple instances at once?

    2. Do you know any tool that allows me to make “Stress Testing” on a site configured with memcache, which only has access through a “logon”?

    Thanks in advance!!

  23. april14344 sagt:
    %A, 14UTCFri, 14 Oct 2011 12:33:22 +0000 %e. %B %Y um %H:%M

    oh cool, this is great! just like what i needed! thanks so much!
    april14344´s last [type] ..Young Driver Insurance – The Best Strategy to Save You Money!

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