Question

How can I solve error "SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)"

I have a 512MB Digital Ocean droplet running on CentOS 6.5 and using Zpanel as my control panel. In it i have hosted 2 web apps, 1 Laravel 4 and the other WordPress and they both work fine only that from time to time i get the following errors which resolve temporarily when i reboot my VPS.

Errors:

Zpanel: Critical Error: [0100] - Unable to connect or authenticate to the ZPanel database (zpanel_core). We advice that you contact the server administator to ensure that the database server is online and that the correct connection parameter are being used.

Laravel: SQLSTATE[HY000] [2002] Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

WordPress: Error establishing a database connection

How can i permanently solve this.

Thanks in advance.


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The most common reason that MySQL will crash or become unavailable on a 512MB droplet is a lack of available memory. Droplets do not have swap space by default and the requirements for a LAMP stack, especially when running a control panel, can exhaust the available memory and cause services to crash.

You can check your available memory with:

free -m

If you find that you are low on memory you can try enabling a swap file on your droplet, optimize your MySQL configuration, or upgrade to a larger droplet plan.