> -----Ursprüngliche Nachricht----- > On Wed, 2025-02-19 at 08:45 +0000, Schmid Andreas wrote: > > I'm trying to install the postgresql-17 Debian package from PGDG apt > > repo alongside an already existing PostgreSQL 16 installation. So > > there is already a PostgreSQL 16 cluster on my machine (which I want > > to upgrade to version 17 using the pg_upgrade command later on). > > > > If I'm not wrong, the PostgreSQL packages used to automatically create > > a new cluster during installation, even if there already was an older > > cluster present. (Using a different port in this case.) But this > > doesn't happen with the 17.3 package. Does anyone know if this > > behavior has changed? Or anyone can explain on which conditions a new > > cluster is created and when not? > > > > There was a now closed discussion on this topic on Stack Overflow: > > https://stackoverflow.com/questions/79441161/postgres-17-3-installatio > > n-no-longer-creates-a-new-cluster Of course, I will create the > > additional cluster using pg_createcluster if this is the way to go. > > The point is that I'm installing PostgreSQL using an Ansible script, > > and pg_createcluster was not needed until now. > > So before I update my script, I hope to get some more information > > about the behavior of the PostgreSQL packages regarding automatic cluster > creation. > > I just tried on an Ubuntu system (I think that the packages are pretty much > the same), and installing 17.3 created a cluster. > I think the Stackoverflow question was about installing 17.3 if v17 is already > installed. In that case, no new cluster is created. >
Well, according to the last comment below the Stack Overflow question, it was about installing 17.3 with a v14 cluster already present. Anyways, I now tried on an Ubuntu 24.04 machine as well, and installing 17.3 alone created a cluster. Cleaned up the machine, then installed 15.11, which created a cluster. Installed 16.7 alongside, which did not create an additional cluster. So it's probably not a 17.3 problem. Same outcome on Ubuntu 20.04. Maybe there generally is no cluster created if there is one present already. I now checked /usr/share/postgresql-common/maintscripts-functions which is installed by the postgresql-common_273.pgdg24.04+1_all.deb package. This script contains the create_main_cluster() function, which according to a comment "skips if any other cluster already exists". So could it be that this function has been updated recently? Can you point me to the repo where this script is maintained?
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