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From: Laurenz Albe <[email protected]>
To: Justin Swanhart <[email protected]>
To: [email protected]
Subject: Re: Archive logging not cleaning up pg_wal directory
Date: Thu, 10 Apr 2025 14:48:00 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAJM9iN3w3UdA3q4_Xnw+Pg+Nnxe4OAUjLQ7EgLtPe36y4A0HDA@mail.gmail.com>
References: <CAJM9iN3w3UdA3q4_Xnw+Pg+Nnxe4OAUjLQ7EgLtPe36y4A0HDA@mail.gmail.com>

On Thu, 2025-04-10 at 08:28 -0400, Justin Swanhart wrote:
> I have the following in my postgresql.conf for archive logging:
> archive_command='test ! -f /var/lib/postgresql/prod_archive_logs/%f && cp %p /var/lib/postgresql/prod_archive_logs/%f'
> 
> This command is properly copying the log files to my archive directory but they remain in the `pg_wal`
> directory after they are copied, consuming hundreds of gigs of space.  Am I supposed to create a cron
> job to clean out the `pg_wal` directory periodically (keep only 1 day of logs I guess?)
> 
> I tried to use mv:
> archive_command='test ! -f /var/lib/postgresql/prod_archive_logs/%f && mv %p /var/lib/postgresql/prod_archive_logs/%f'
> 
> When I did this the archives were moved away to the archive directory but when I tried to set up
> replication the server could not find the archived log to replicate from so I changed it to "cp" and now have this problem.
> 
> What am I missing?

Something else is blocking WAL removal:
https://www.cybertec-postgresql.com/en/why-does-my-pg_wal-keep-growing/

Since you mention replication, my money is on a stale replication slot.

Yours,
Laurenz Albe

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