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I'm running MySQL 5.6.30 - MySQL Community Server (GPL) on ubuntu-16.04-x86_64 and I'm using phpMyAdmin 4.7.7.

Sometimes, without doing anything on the Server or phpMyAdmin, I'm getting this error message on my websites:

Connection failed: SQLSTATE[HY000] [2002] Connection refused

When trying to log in into phpMyAdmin I'm getting these four error messages:

#2002 - No such file or directory – The server is not responding (or the local server's socket is not correctly configured).

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mysqli_real_connect(): (HY000/2002): No such file or directory

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Connection for controluser as defined in your configuration failed.

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mysqli_real_connect(): (HY000/2002): No such file or directory

After making a reboot everything is working fine as normal, there are no error messages any more and I'm able to login into phpMyAdmin.

Why does it happen? Any ideas?

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  • Last time I've tried something like this, is turned out to be as simple as a "no more disk space" :/ So next time it's occur I'll suggest you do a "df -sh" on your tmp drive PS: As this isn't an exact answer, I've would have added it as a comment, but not allowed to Commented Dec 31, 2017 at 10:51
  • It is likely to be a failed or failing disk on the server. Check /var/log/messages for any errors. Commented Dec 31, 2017 at 10:51

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Any ideas?

  • Search is your friend.

  • As per What Causes the 'Connection Refused' message ?, it seems likely that nothing is listening. We can deduce that MySQL has likely stopped working.

  • Examine your system and mysql logs to find relevant messages and understand the issue.

I will take a wild guess and suggest that the OOM killer is killing MySQL because your system is running out of memory. I could be wildly wring though, it could be cosmic rays or disc space or something completely different.

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