Postgres - FATAL: database files are incompatible with server

Question

After restarting my MacBook Pro I am unable to start the database server:

could not connect to server: No such file or directory
Is the server running local         


        

Answer 1

If you recently upgraded to 11 or 12 from 10.x you can run the below command to upgrade your postgres data directory retaining all data:

brew postgresql-upgrade-database

The above command is taken from the output of brew info postgres