Commit 0574279 set the file permissions to 0600 rather than the user's
umask, but if initdb was executed with -g/--allow-group-access, the
file is maintained with 0640, so we'll just maintain the existing
permssions.
This is mainly useful for the --data-directory-config option, which
requires permission to read pg_settings to verify that the data
directory configured in "repmgr.conf" matches the data directory
actually in use.
If pg_settings read permission is not available, repmgr will fall
back to a simple check that the data directory configured in
"repmgr.conf" is a valid PostgreSQL directory. This is not entirely
foolproof, as it's possible PostgreSQL could be using a different
data directory.
From PostgreSQL 12, the SQL-level function "pg_promote()" can be used
to promote a PostgreSQL instance, however usage is restricted to
superusers and users to whom explicit execution permission for this
function has been granted.
Therefore, if execution permission is not available, fall back to
"pg_ctl promote".
There were some corner cases where "repmgr standby switchover"
would erroneously report a successful switchover, even if the
demotion candidate had not reattached to the promotion candidate.
Also improve the logging in various places to make it clearer
what is happening on which node.
A more generic option name to cover pre- and post-Pg12 replication
configuration methods.
--recovery-conf-only is retained as an alias for backwards
compatibility.
repmgrd has a check to see if the upstream node has unexpectedly
changed, e.g. if the repmgrd service is paused and the PostgreSQL
instance has been pointed to another node.
However this check was relying on the node record on the local node
being up-to-date, which may not be the case immediately after a
failover, when the node is still replaying records updated prior
to the node's own record being updated. In this case it will
mistakenly assume the node is following the original primary
and attempt to restart monitoring, which will fail as the original
primary is no longer available.
To prevent this, we check against the node's record on the upstream
node.
Addresses issue noted in GitHub #587 and #588.
This makes it possible to return log output when executing repmgr
remotely at a different level to the one defined in the remote
repmgr's repmgr.conf.
This is particularly useful when DEBUG output is required.
"repmgr daemon" can be interpreted to mean the commands affect the local
daemon process only. Rename the commands which affect the entire cluster
to "repmgr service ...".
The "repmgr daemon ..." form of the affected commands is retained for backwards
compatibility.
The following options have long since been deprecated, and any attempt
to use them results only in a warning that they are no longer valid:
--data-dir
--no-conninfo-password
--recovery-min-apply-delay
Previously, repmgr was using a very simple ad-hoc string-based parser,
which had various limitations and allowed configuration files to be
created in a way which could cause confusion and/or unexpected
behaviour.
For example, it accepted strings enclosed in single quotes, but treated
strings enclosed in double quotes literally. A node_name defined thusly:
node_name="somenode"
would result in the literal value '"somenode"' being used, which could
lead to unobvious errors along the lines of:
no record found for ""somenode""
The configuration file parser has been adapted from the one used by
PostgreSQL itself, so behaves more-or-less identically (though some
functions such as file inclusion are not supported in repmgr).
This makes configuration parsing more robust and consistent;
additionally, error reporting will be more precise.
Note this does mean that some repmgr.conf items previously accepted
as valid by repmgr will now be rejected; in particular this includes
strings containing spaces which are not enclosed in single quotes.
This reverts commit c6ca183247.
Backing out this patch for now as the Debian build system doesn't
seem to like it, even though it builds just fine on Debian itself.
Use &repmgrversion; entity to generate the current version number and
prevent document bitrot.
Also define a "release-current" ID attribute for ease of linking to
the current release notes.
Per notification from the mailing list.
Previously, repmgr was using a very simple ad-hoc string-based parser,
which had various limitations and allowed configuration files to be
created in a way which could cause confusion and/or unexpected
behaviour.
For example, it accepted strings enclosed in single quotes, but treated
strings enclosed in double quotes literally. A node_name defined thusly:
node_name="somenode"
would result in the literal value '"somenode"' being used, which could
lead to unobvious errors along the lines of:
no record found for ""somenode""
The configuration file parser has been adapted from the one used by
PostgreSQL itself, so behaves more-or-less identically (though some
functions such as file inclusion are not supported in repmgr).
This makes configuration parsing more robust and consistent;
additionally, error reporting will be more precise.
Note this does mean that some repmgr.conf items previously accepted
as valid by repmgr will now be rejected; in particular this includes
strings containing spaces which are not enclosed in single quotes.
While it's technically possible to have a standby follow another
standby while the primary is not available, repmgr will not be able
to update its metadata, which will cause Confusion and Chaos.
Update the documentation to make this clear, and provide a more helpful
error message if this situation occurs. The operation previously
failed anyway, but with an unhelpful message about not being able to
find a node record.
This helps provide a better picture of the state of the cluster, i.e.
making it more obvious whether there's been a timeline divergence.
This also provides infrastructure for further improvements in cluster
status display and diagnosis.
Note this is only available in PostgreSQL 9.6 and later as it relies
on the SQL functions for interrogating pg_control, which can be executed
remotely. As PostgreSQL 9.5 will shortly be the only community-supported
version without these functions, it's not worth the effort of trying
to duplicate their functionality.
