How to start PostgreSQL on boot on Debian Buster

Question

I have upgraded PostgreSQL from version 9.6 to 12 in Debian 10 Buster. I'm currently running the 12 cluster, and I'm keeping the 9.6 cluster installed, but not running (down).

I can start the 12 main cluster with:

$ sudo pg_ctlcluster 12 main start $ sudo pg_lsclusters Ver Cluster Port Status Owner Data directory Log file 9.6 main 5433 down postgres /var/lib/postgresql/9.6/main /var/log/postgresql/postgresql-9.6 main.log 12 main 5432 online postgres /var/lib/postgresql/12/main /var/log/postgresql/postgresql-12-main.log 

But if I reboot with sudo reboot, it does not restart automatically on boot. After reboot I get the following message:

$ sudo pg_lsclusters Ver Cluster Port Status Owner Data directory Log file 9.6 main 5433 down postgres /var/lib/postgresql/9.6/main /var/log/postgresql/postgresql-9.6-main.log 12 main 5432 down postgres /var/lib/postgresql/12/main /var/log/postgresql/postgresql-12-main.log 

How can I enable the 12 main cluster to automatically start on boot?

Answer 1

(I found the answer)

You need to edit the /etc/postgresql/12/main/start.conf file and replace manual with auto

$ sudo nano /etc/postgresql/12/main/start.conf # This cluster was upgraded to a newer major version. The old # cluster has been preserved for backup purposes, but is not started # automatically. auto