Per e.g. this complaint:
https://groups.google.com/d/msg/repmgr/a-SMIQFGDBs/rgRH3p4ZPgYJ
Before:
$ repmgr -f /etc/postgres/repmgr.conf cluster status
repmgr: Replicator manager
Try "repmgr --help" for more information.
after:
$ repmgr -f /etc/postgres/repmgr.conf cluster status
repmgr: Replication manager
[ERROR] Unknown server command 'status'
Try "repmgr --help" for more information.
This involves mainly abstracting the functions which copy
and create records from repmgr.c to dbutils.c, as they need
to be shared between repmgr and repmgrd.
Per issue noted here:
https://groups.google.com/forum/#!topic/repmgr/v5nu1Xwf6X0
This makes it practical to take a back with rsync where tablespaces
require remapping. It also makes tablespace remapping possible for
9.3, where pg_basebackup does not support this option.
Sometimes it's desirable to re-sync a "stale" data directory
on a standby, rather than start from scratch with pg_basebackup().
This re-adds the rsync code from the 2.x series, with some
modifications.
TODO: tablespace support.
If the user don't put that option in rsync_options using of "--force"
could be unsafe.
While the probability of failures because of this are low they aren't
zero.
"pg_basebackup_options"
Enable custom options to be passed to pg_basebackup
(e.g. --max-rate, --checkpoint, --xlogdir)
"tablespace_mapping"
Analogue to pg_basebackup's (9.4 and later) -T/--tablespace-mapping
option.
Tablespace mapping could also be passed via "pg_basebackup_options",
however by providing a separate parameter it makes the configuration
file easier to read and allows us to verify the specified tablespaces
exist (pg_basebackup won't do this, which can lead to undesired
behaviour, i.e. attempting to create the tablespace in the original
path).
Previously, the pg_bindir parameter was mandatory and could only be
provided in the repmgr.conf file, which was leading to the slightly
bizarre situation that e.g. for "clone standby", repmgr was complaining
that it didn't want the configuration file when it actually did.
pg_bindir is now optional - if not provided, it will use the default
path. It can be provided in the repmgr.conf file, or as a command
line parameter; the latter overrides the former.
Previous behaviour was somewhat counterintuitive, with an error
message being logged if no configuration file provided or found,
even though this is not actually an error.
Configuration files now handled like this:
- if a configuration file is explicitly provided (-f), error out
if not found.
- if no configuration file explicitly provided, attempt to open
default configuration file; if this does not exist, log
notice and continue with default values.
Also, for 9.4 and later add a hint about replication slot usage
if 'use_replication_slots' not set.
