TL;DR: Simply (re)starting the mysql simply solve the issue. Here’s the complete story:

I randomly checked this blog1 and found out that this blog could not connect to the database and displaying “error establishing database connect” message.  I googled “digitalocean wordpress error establishing database connect“, found out this thread, and performed the exact steps mentioned on the thread:

  1. Connect using ssh to the server
  2. Check mysql’s status
  3. (re)start the mysql

The site can be accessed now.

  1. Which is hosted on Digital Ocean 

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