Greetings,
In the used PostgreSQL setup the configuration files (postgresql.conf,
pg_hha.conf and pg_ident.conf) are located in another location than the data
directory: /etc/database/postgres/13/data
In postgresql.conf following locations are updated:
#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------
# The default values of these variables are driven from the -D
command-line
# option or PGDATA environment variable, represented here as ConfigDir.
data_directory = '/var/database/postgres/13/data'
hba_file = '/etc/database/postgres/13/data/pg_hba.conf'
ident_file = '/etc/database/postgres/13/data/pg_ident.conf'
The cluster can be started with pg_ctl and use the path to postgresql.conf
in -D:
> pg_ctl -D /etc/database/postgres/13/data start
Trying to use pg_rewind to synchronize a PostgreSQL data directory (e.g.
bringing back failed master)
> pg_rewind --target-pgdata=/etc/database/postgres/13/data -P -R -c
--source-server='host=<ip-address source> port=5432 user=rewind_user
password=rewind_user dbname=postgres'
Observed result:
==========
pg_rewind: connected to server
pg_rewind: fatal: could not open file
"/etc/database/postgres/13/data/global/pg_control" for reading: No such file
or directory
Improvement:
It would be nice to have pg_rewind support postgresql.conf being located
somewhere else than in the data directory, just like pg_ctl does.
Of course it is possible to workaround the issue but it takes more steps
than would be necessary (with increased error risk of copying and moving
configuration files around).
Not only applicable for PostgreSQL 13, but also for the other versions as
well
Yes, I think in general, pg_rewind should also support this function. To support it, you can copy the relevant code directly from pg_ctl, here is the patch.
But of course, I hope to listen to other people's opinions, so that we can understand why we didn't support this function before, and whether there are any risks...
Thanks.
--
There is no royal road to learning.
HighGo Software Co.
