Thread

1. 5 Instances in one box -- Postgresql.conf Archive Log command

   Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de> — 2026-02-09T09:35:06Z

   Hello,
   
   We have 5 instances running under  different ports and we have multiple servers with the same structure. i.e. I have multiple servers with the same five instances per server configuration.
   
   /var/lib/pgsql/INST1/data - Port number 1234
   /var/lib/pgsql/INST2/data - Port number 1235
   /var/lib/pgsql/INST3/data - Port number 1236
   /var/lib/pgsql/INST4/data - Port number 1237
   /var/lib/pgsql/INST5/data - Port number 1238
   
   I try to make changes to postgresql.conf  in our sandbox/testing server for just one instance and I simply copy over the changes to all the instances and then to all the servers.
   
   I want to place the archived WALs in separate directories for each instance.  How can I introduce the INST1 INST2 INST3 INST4 names in the archive command  variable /mnt/server/archivedir , without explicitly editing changing each postgresql.conf file? It is not absolutely important for me that the archive log directories bear the exact names INST1 2 3 ..5. however, I want the archive log directories to be resolved to unique names based on which instance the archive is done.
   
   Thank you in advance for your time.
   
   LG
   
   Ram
   
   archive_command = 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'  # Unix
   
   
   
   Freundliche Grüße
   
   i. A. Ramachandran Subramanian
   Zentralbereich Informationstechnologie
   
   Alte Leipziger Lebensversicherung a.G.
   
   
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2. Re: 5 Instances in one box -- Postgresql.conf Archive Log command

   Greg Sabino Mullane <htamfids@gmail.com> — 2026-02-09T17:44:02Z

   You cannot do that natively with Postgres. However, one solution would be
   to make the archive_command into a separate file, that the main
   postgresql.conf includes. Then you can keep copying the postgresql.conf but
   keep the archive_command separate and unique. The syntax is
   
   include = 'myserver.conf'
   
   And then the myserver.conf would contain things specific to each server,
   e.g.
   
   archive_command = 'test ! -f /archives/INST3/%f && cp %p /archives/INST3/%f'
   cluster_name = 'inst3'
   
   
   Cheers,
   Greg