MySql stopped and I can't restart it.

December 7, 2013 33.1k views
stevelack
By:
stevelack
I received the following error: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) So after restarting the server and trying to figure out what was going on I tried reinstalling mysql with this: apt-get install mysql-server Then I restarted apache and still keep getting the same error message. What could be causing this? Can anyone point me in the right direction to trouble shoot this issue? Thanks!
3 comments
  • eanbowman September 2, 2014

    I'm having the same issue, 512MB droplet.

    mysql is running and I can log into it.

    I can see all of my tables still so it's not likely someone found an SQL injection attack and my passwords are all the same.

    I have rebooted my droplet.

    free
    total used free shared buffers cached
    Mem: 501868 327452 174416 21180 23376 174676
    -/+ buffers/cache: 129400 372468
    Swap: 0 0 0

    df
    Filesystem 1K-blocks Used Available Use% Mounted on
    /dev/vda 20509308 7145252 12299200 37% /
    none 4 0 4 0% /sys/fs/cgroup
    udev 240132 4 240128 1% /dev
    tmpfs 50188 312 49876 1% /run
    none 5120 0 5120 0% /run/lock
    none 250932 0 250932 0% /run/shm
    none 102400 0 102400 0% /run/user

    As you can see, despite the small droplet there is tons of RAM and disk space.

    What gives?

    [EDIT] Okay it seems like my mysql server started responding after I wrote this. Random...

  • arnlweb September 13, 2015

    Same problem I have found with 512 plan. You can view it http://mediacreeks.com

  • zainali202 October 26, 2015

    Log in as super user or use sudo
    Open /etc/mysql/my.cnf using gedit
    Find bind-address, and change its value to the database server host machine's IP address. For me, it was localhost or 127.0.0.1
    Save and close the file.
    Come back to terminal and execute sudo service mysql start

    And it worked for me.

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12 Answers
stevelack December 8, 2013
It's a 2gb droplet and I did reboot. In case anyone else runs into this situation I checked the logs and didn't see anything that would indicate a problem. I reinstalled MySql, rebooted the droplet and updated apache. I couldn't find anything that would be causing MySql to not work. I finally ended up taking a snapshot of the droplet, creating a new droplet from that snapshot image and adding the DNS info to the new droplet IP for all the sites on the old droplet. Then I restarted the new droplet and everything was fixed and working properly.
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kamaln7 MOD December 7, 2013
It means that mysql is not running. Try checking its error logs and seeing why it's crashing: 
tail /var/log/mysql.err
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stevelack December 7, 2013
Here's what I can find but I have no idea what could be causing the error:

131207 8:46:33 [Note] /usr/sbin/mysqld: Normal shutdown

131207 8:46:33 [Note] Event Scheduler: Purging the queue. 0 events
131207 8:46:33 InnoDB: Starting shutdown...
131207 8:46:35 InnoDB: Shutdown completed; log sequence number 6625970
131207 8:46:35 [Note] /usr/sbin/mysqld: Shutdown complete

131207 8:46:35 [Note] Plugin 'FEDERATED' is disabled.
131207 8:46:35 InnoDB: The InnoDB memory heap is disabled
131207 8:46:35 InnoDB: Mutexes and rw_locks use GCC atomic builtins
131207 8:46:35 InnoDB: Compressed tables use zlib 1.2.3.4
131207 8:46:35 InnoDB: Initializing buffer pool, size = 128.0M
131207 8:46:35 InnoDB: Completed initialization of buffer pool
131207 8:46:35 InnoDB: highest supported file format is Barracuda.
131207 8:46:35 InnoDB: Waiting for the background threads to start
131207 8:46:36 InnoDB: 5.5.31 started; log sequence number 6625970
131207 8:46:36 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306
131207 8:46:36 [Note] - '127.0.0.1' resolves to '127.0.0.1';
131207 8:46:36 [Note] Server socket created on IP: '127.0.0.1'.
131207 8:46:36 [Note] Event Scheduler: Loaded 0 events
131207 8:46:36 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.31-0ubuntu0.12.04.2' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu)
131207 9:35:03 [Note] /usr/sbin/mysqld: Normal shutdown

131207 9:35:03 [Note] Event Scheduler: Purging the queue. 0 events
131207 9:35:03 InnoDB: Starting shutdown...
131207 9:35:04 InnoDB: Shutdown completed; log sequence number 6764201
131207 9:35:04 [Note] /usr/sbin/mysqld: Shutdown complete
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pablo December 7, 2013
Is this a 512 MB droplet?
Reply
theguycalledsam December 7, 2013
Try rebooting your droplet:
sudo reboot
Reply
stevelack December 7, 2013
It's a 2gb droplet and I have rebooted.
Reply
phantronggiap October 16, 2014

This my website : Chu Doanh Nghiep
Me too, ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)

I was trying reboot, because mysql not running

Reply
heartlovelust December 4, 2014

I have a new droplet and experienced this both times I shut it down. I just tried entering the console and inputting sudo service mysql restart. For me, this worked immediately.

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kindpire December 5, 2014

Hi, same problem here and if I restart mysql, it would FAIL. Everything looks fine after reboot, however this happens frequently. Does anyone know how this happens?

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  • kindpire December 5, 2014

    thanks kama, I guess it's out of memory... Isn't 512M memory enough to run a blog on CentOS?

  • asb MOD December 5, 2014

    @kindpire There are a lot of different factors that come into play when considering the memory requirements for MySql. Unfortunately, many WordPress plugins authors don't prioritize performance. I'd start with an audit of the plugins you're using. Either way, adding a swap file to your server should help by giving to some wiggle room when it comes to memory usage. Check out: How To Add Swap on CentOS 7

    How To Add Swap on CentOS 7
    by Josh Barnett
    One of the easiest ways to make your server more responsive, and guard against out-of-memory errors in your application, is to add some swap space. This gives you the ability to increase the amount of information that your server can keep in its working memory. In this guide, we will cover how to create and enable a swap file on a CentOS 7 server.
  • kindpire December 6, 2014

    @asb Hi, thanks for quick reply! Yes, I guess the problems should be in my MySQL (MariaDB) setting. Each time, once I installed a new plugin, it would crash. After reboot the whole machine, everything goes fine again.

david26 January 9, 2015

Hi, same problem

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arnlweb September 13, 2015

Same problem here using 512 plan, you can view media creeks

Reply
derek_tgm February 9, 2016

Killed 5 hours trying to figure out what causes the error. The solution was stupid simple, I just needed to free up some disk space on my droplet. I had a few huge log files that had eaten up all the free space so mysql simply couldn't start and gave me the ERROR 2002 (HY000). Check how much free space you have by doing *df -h * command in terminal.

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