Issue ERR [1] SQLSTATE[HY000] [2002] No such file or directory

[Mnu555]

After Update to
Plesk Onyx 17.5.3 Update 24
1) i get error :Error message on Plesk home page: The Plesk update failed. Click OK to close the message.
I found this Error message on Plesk home page: The Plesk update failed. Click OK to close the message.
there it is written how to remove this message. But nothing is written about the causes and possible problems after that.
2) I look in panel.log and found error: ERR [1] SQLSTATE[HY000] [2002] No such file or directory

And not find in https://support.plesk.com/hc/en-us/articles/ anything about this.
I'm worried about this error. Because the previous update - ended with a drop in Plesk and Plesk recovery did not help. I was tired of looking for reasons and I restored the server from snapshot at that time. Now I'm thinking whether new problems will begin. What means "ERR [1] SQLSTATE[HY000] [2002] No such file or directory" in log ? What do i have to do ?

 

[UFHH01]

Hi Mnu555,

your issue can have several root causes, so I suggest to start with for example:

=> ERROR: Zend_Db_Adapter_Exception: SQLSTATE[HY000] [2002] No such file or directory​

 

[Mnu555]

ERROR: Zend_Db_Adapter_Exception: SQLSTATE[HY000] [2002] No such file or directory this is not help. I have a lot of places and the database is working.

 

[UFHH01]

Hi Mnu555,

unfortunately you missed the additional links at the mentioned Plesk KB - article, which are all related to your described errors message. Pls. consider to follow each of the links, to investigate YOUR special and unique root cause.

 

[Mnu555]

I looked at all these links:
Plesk shows SQLSTATE[HY000] [2002] No such file or directory: InnoDB: Warning: io_setup() failed with EAGAIN
Plesk is inacessible after MySQL upgrade on Debian/Ubuntu: SQLSTATE[HY000] [2002] No such file or directory
Plesk shows SQLSTATE[HY000] [2002] No such file or directory: InnoDB: Unable to lock ./ibdata1 error: 11
Plesk shows SQLSTATE[HY000] [2002] No such file or directory: General error: 1 Can't create/write to file '/tmp/#sql_de3_0.MYI' (Errcode: 13)
It has nothing to do with my problem. I have a running database and I'm entering the Plesk panel without problem.