postgresql installed via homebrew that won't start

After a reboot, postgresql wouldn’t start. Tried

1	brew services restart postgresql

and still nothing. Checked the /usr/local/var/postgres/server.log and it was complaining about /usr/local/var/postgres/postmaster.pid. My first thought was to delete it, but I ran a google search before. Luckily, I found this link where it clearly says that deleting the pid file is not recommended. So, I ran a cat command and found the PID ( it’s the first line in the file ), and did a kill -9 PID. After that, running again brew services postgresql restart worked, and PG booted.