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Memcached Memcached Socket on Centmin Mod

Discussion in 'Other Centmin Mod Installed software' started by BamaStangGuy, Feb 8, 2017.

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  1. Feb 8, 2017 #21
    BamaStangGuy

    BamaStangGuy Active Member

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  2. Feb 8, 2017 #22
    BamaStangGuy

    BamaStangGuy Active Member

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    Yep. Railgun also will not connect. It fails to restart saying can not connect on that paths socket. Change back to TCP and everything works fine.
     
  3. Feb 8, 2017 #23
    eva2000

    eva2000 Administrator Staff Member

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    On CentOS 7 try
    Code (Text):
    systemctl daemon-reload
memcachedstop
memcachedstart

    does that work, the systemctl daemon-reload might be needed after editing /etc/init.d/memcached
     
  4. Feb 8, 2017 #24
    eva2000

    eva2000 Administrator Staff Member

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    Okay found the bug in init.d/memcached incorrectly used test -f for socket while i should of tested if it was a socket = test -S fixing soon. Strange how it worked for me though !
     
  5. Feb 8, 2017 #25
    eva2000

    eva2000 Administrator Staff Member

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    Last edited: Feb 8, 2017
  6. Feb 8, 2017 #26
    BamaStangGuy

    BamaStangGuy Active Member

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    So I finally figured out what was wrong. It is the permissions. I was reading this blog: Installing and configure Memcache on CentOS 7

    and changed to this:
    Code:
    OPTIONS="-s '/var/run/memcached/memcached.sock' -a 0766"
    and now everything works.

    Screen Shot 2017-02-08 at 4.24.24 AM.png

    Why would 775 work on your server but not mine?
     
    Last edited: Feb 8, 2017
  7. Feb 8, 2017 #27
    eva2000

    eva2000 Administrator Staff Member

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  8. Feb 8, 2017 #28
    BamaStangGuy

    BamaStangGuy Active Member

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    Code:
    [04:41][root@christianforums.whippmedia.com centminmod]# id nginx
uid=1000(nginx) gid=1000(nginx) groups=1000(nginx)
[04:41][root@christianforums.whippmedia.com centminmod]# id memcached
uid=1001(memcached) gid=1001(memcached) groups=1001(memcached),1000(nginx)
     
  9. Feb 8, 2017 #29
    eva2000

    eva2000 Administrator Staff Member

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    looks good and same as mine on working servers, so far tested on local virtualbox centos 7 instance and 4 live centos 7 systems without issue with memcached unix socket with 0775 socket permissions
     
  10. Feb 8, 2017 #30
    BamaStangGuy

    BamaStangGuy Active Member

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    I will do a fresh install on Linode since I can reproduce it on their servers. Will document anything I might do differently.
     
  11. Feb 8, 2017 #31
    eva2000

    eva2000 Administrator Staff Member

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    One thing is for railgun usage of memcached server, does railgun run on it's own user/group i.e. railgun ? you might need to add railgun user to memcached usergroup
    Code (Text):
    usermod -G memcached railgun
     
  12. Feb 8, 2017 #32
    BamaStangGuy

    BamaStangGuy Active Member

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    Railgun is connecting fine to memcached now. So I guess it doesn't need to be a part of that group.

    Code:
    [04:54][root@christianforums.whippmedia.com centminmod]# id railgun
uid=992(railgun) gid=991(railgun) groups=991(railgun)
     
  13. Feb 8, 2017 #33
    eva2000

    eva2000 Administrator Staff Member

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    Try adding railgun user to memcached group and changing socket permissions to 0755 and see
     
  14. Apr 24, 2017 #34
    Jimmy

    Jimmy Well-Known Member

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    How would you add another server? The below returns an error in the memcache.php page.

    Code:
    $MEMCACHE_SERVERS[] = array('unix:///var/run/memcached/memcached1.sock','unix:///var/run/memcached/memcached2.sock');
     
    Last edited: Apr 24, 2017
  15. Apr 24, 2017 #35
    eva2000

    eva2000 Administrator Staff Member

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    it's a PHP array so add a 2nd line
    PHP:
    $MEMCACHE_SERVERS[] = 'mymemcache-server1:11211'; // add more as an array
    $MEMCACHE_SERVERS[] = 'mymemcache-server2:11211'; // add more as an array
     
  16. Apr 24, 2017 #36
    Jimmy

    Jimmy Well-Known Member

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    Thanks!

    Also, if I would want to add additional memcache servers to the /etc/init.d/memcached I would just add additional variables throughout the file? Example:

    Code:
    SOCKETNAMEA='/var/run/memcached/memcached1.sock'
SOCKETA="-s $SOCKETNAMEA -a 0775"
SOCKETNAMEB='/var/run/memcached/memcached2.sock'
SOCKETB="-s $SOCKETNAMEB -a 0775"
SOCKETNAMEC='/var/run/memcached/memcached3.sock'
SOCKETC="-s $SOCKETNAMEC -a 0775"
     
  17. Apr 24, 2017 #37
    Jimmy

    Jimmy Well-Known Member

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    For some reason the memcache.php file doesn't like the second server.

    Code:
    Cant connect to:unix:///var/run/memcached/memcached2.sock:0
    I had no problem getting it working when I switched to the socket. I went into the centmin menu, exited, restarted memcache, and restarted php / nginx.

    Was there anything else I had to do?
     
  18. Apr 24, 2017 #38
    eva2000

    eva2000 Administrator Staff Member

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    no that won't work, init.d/memcached file by Centmin Mod is hardcoded for 2 instances only right now.

    is 2nd memcached server running ?
     
  19. Apr 24, 2017 #39
    Jimmy

    Jimmy Well-Known Member

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    Ok, I wasn't sure if I could go through the file and add the extra variables to make it more than 2 servers... since you have everything in the file labeled 1/2 A/B.

    Was there something specific I needed to do to start the second server?

    Missed the SERVERCOUNT=1. Everything is working fine now! (y)
     
    Last edited: Apr 24, 2017
  20. Apr 24, 2017 #40
    eva2000

    eva2000 Administrator Staff Member

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    also need to set in /etc/init.d/memcached
    Code (Text):
    SERVERCOUNT=2

    it's fixed to only register 1 or 2
     
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