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Re: pg_rewind problem: cannot find WAL 3+ messages / 2 participants [nested] [flat]
* Re: pg_rewind problem: cannot find WAL @ 2025-05-08 06:54 Luca Ferrari <[email protected]> 2025-05-08 11:26 ` Re: pg_rewind problem: cannot find WAL Luca Ferrari <[email protected]> 0 siblings, 1 reply; 3+ messages in thread From: Luca Ferrari @ 2025-05-08 06:54 UTC (permalink / raw) To: Laurenz Albe <[email protected]>; +Cc: pgsql-general <[email protected]> On Wed, May 7, 2025 at 3:55 PM Laurenz Albe <[email protected]> wrote: > > I don't think it is connected to a WAL switch. > Thanks. > I'd say that you should set "wal_keep_size" high enough that all the WAL > needed for pg_rewind is still present. > > If you have a WAL archive, you could define a restore_command on the server > you want to rewind. I've pgbackrest making backups, so I have an archive_command. I'm going to see if putting a restore_command can fix the problem. Thanks for the suggestion. Luca ^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: pg_rewind problem: cannot find WAL 2025-05-08 06:54 Re: pg_rewind problem: cannot find WAL Luca Ferrari <[email protected]> @ 2025-05-08 11:26 ` Luca Ferrari <[email protected]> 2025-05-08 15:10 ` Re: pg_rewind problem: cannot find WAL Adrian Klaver <[email protected]> 0 siblings, 1 reply; 3+ messages in thread From: Luca Ferrari @ 2025-05-08 11:26 UTC (permalink / raw) To: Laurenz Albe <[email protected]>; +Cc: pgsql-general <[email protected]> On Thu, May 8, 2025 at 8:54 AM Luca Ferrari <[email protected]> wrote: > > I've pgbackrest making backups, so I have an archive_command. I'm > going to see if putting a restore_command can fix the problem. > But I'm facing a quite trivial problem: in ubuntu installation the configuration files are separated from the PGDATA. Apparently pg_rewind is trying to read postgresql.conf to get the restore_command, and I don't know how to specify the different location of the postgresql.conf (cannot specifcy -c as in postgres): $ /usr/lib/postgresql/17/bin/pg_rewind -D /var/lib/postgresql/17/main --source-server="user=replica_fluca host=dev-psqlha3 dbname=replica_fluca" -R -P --debug -c postgres: could not access the server configuration file "/var/lib/postgresql/17/main/postgresql.conf": No such file or directory no data was returned by command "/usr/lib/postgresql/17/bin/postgres -D /var/lib/postgresql/17/main -C restore_command" child process exited with exit code 2 pg_rewind: error: could not read restore_command from target cluster Any idea? Clearly, postgresql.auto.conf is within PGDATA, and since my recovery_command is there, one trick could be to touch and empty PGDATA/postgresql.conf, pg_rewind, remove the fake configurtion file. But I'm sure there is a smarter solution. Thanks, Luca ^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: pg_rewind problem: cannot find WAL 2025-05-08 06:54 Re: pg_rewind problem: cannot find WAL Luca Ferrari <[email protected]> 2025-05-08 11:26 ` Re: pg_rewind problem: cannot find WAL Luca Ferrari <[email protected]> @ 2025-05-08 15:10 ` Adrian Klaver <[email protected]> 0 siblings, 0 replies; 3+ messages in thread From: Adrian Klaver @ 2025-05-08 15:10 UTC (permalink / raw) To: Luca Ferrari <[email protected]>; Laurenz Albe <[email protected]>; +Cc: pgsql-general <[email protected]> On 5/8/25 04:26, Luca Ferrari wrote: > On Thu, May 8, 2025 at 8:54 AM Luca Ferrari <[email protected]> wrote: >> >> I've pgbackrest making backups, so I have an archive_command. I'm >> going to see if putting a restore_command can fix the problem. >> > > But I'm facing a quite trivial problem: in ubuntu installation the > configuration files are separated from the PGDATA. > Apparently pg_rewind is trying to read postgresql.conf to get the > restore_command, and I don't know how to specify the different > location of the postgresql.conf (cannot specifcy -c as in postgres): > > $ /usr/lib/postgresql/17/bin/pg_rewind -D /var/lib/postgresql/17/main > --source-server="user=replica_fluca host=dev-psqlha3 > dbname=replica_fluca" -R -P --debug -c > postgres: could not access the server configuration file > "/var/lib/postgresql/17/main/postgresql.conf": No such file or > directory > no data was returned by command "/usr/lib/postgresql/17/bin/postgres > -D /var/lib/postgresql/17/main -C restore_command" > child process exited with exit code 2 > pg_rewind: error: could not read restore_command from target cluster > > Any idea? /usr/lib/postgresql/17/bin/pg_rewind --help pg_rewind resynchronizes a PostgreSQL cluster with another copy of the cluster. Usage: pg_rewind [OPTION]... Options: -c, --restore-target-wal use "restore_command" in target configuration to retrieve WAL files from archives -D, --target-pgdata=DIRECTORY existing data directory to modify --source-pgdata=DIRECTORY source data directory to synchronize with --source-server=CONNSTR source server to synchronize with -n, --dry-run stop before modifying anything -N, --no-sync do not wait for changes to be written safely to disk -P, --progress write progress messages -R, --write-recovery-conf write configuration for replication (requires --source-server) --config-file=FILENAME use specified main server configuration file when running target cluster --debug write a lot of debug messages --no-ensure-shutdown do not automatically fix unclean shutdown --sync-method=METHOD set method for syncing files to disk -V, --version output version information, then exit -?, --help show this help, then exit So use --config-file=FILENAME? > Clearly, postgresql.auto.conf is within PGDATA, and since my > recovery_command is there, one trick could be to touch and empty > PGDATA/postgresql.conf, pg_rewind, remove the fake configurtion file. > But I'm sure there is a smarter solution. > > Thanks, > Luca > > -- Adrian Klaver [email protected] ^ permalink raw reply [nested|flat] 3+ messages in thread
end of thread, other threads:[~2025-05-08 15:10 UTC | newest] Thread overview: 3+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2025-05-08 06:54 Re: pg_rewind problem: cannot find WAL Luca Ferrari <[email protected]> 2025-05-08 11:26 ` Luca Ferrari <[email protected]> 2025-05-08 15:10 ` Adrian Klaver <[email protected]>
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