A problem occurred while performing the post-installation step. The installation may have failed Failure to launch the server. postgresql mac code example

Example 1: postgresql blocked on mac

$ brew services stop postgresql
$ rm /usr/local/var/postgres/postmaster.pid # adjust path accordingly to your install
$ brew services start postgresql

Example 2: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

$ rm /usr/local/var/postgres/postmaster.pid
$ brew services restart postgresql

# Think to restart your terminal (cmd + q on macOS)