SQLSTATE HY000 2002 No such file or directory ???

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My entire site are down, plus I cannot enter my prestashop admin area. Downtime are costly and affects my customers! This is the text I get when try to enter my site: Link to database cannot be established: SQLSTATE[HY000] [2002] No such file or directory.

It worked last night, so any help much appreciated, thanks!
Hello MartinBenjamin,

Thank you for contacting us with your SQL error. I'm glad you were able to get it fixed.

Are there any tips you can share for other people trying to troubleshoot this error?

If you have any further questions, feel free to post them below.

Thank you,