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Clarify WAL file retention issue during standby cloning.

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Per GitHub issue #86.
This commit is contained in:
Ian Barwick
2015-07-02 09:32:30 +09:00
parent 45e29c5b28
commit 5240a5723a
1 changed files with 18 additions and 3 deletions
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README.md
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@@ -123,9 +123,12 @@ like the followingin `postgresql.conf`:
PostgreSQL 9.4 makes it possible to use replication slots, which means PostgreSQL 9.4 makes it possible to use replication slots, which means
the value of wal_keep_segments need no longer be set. With 9.3, `repmgr` the value of `wal_keep_segments` need no longer be set. See section
expects it to be set to at least 5000 (= 80GB of WAL) by default, though "Replication slots" below for more details.
this can be overriden with the `-w N` argument.
With PostgreSQL 9.3, `repmgr` expects `wal_keep_segments` to be set to
at least 5000 (= 80GB of WAL) by default, though this can be overriden
with the `-w N` argument.
A dedicated PostgreSQL superuser account and a database in which to A dedicated PostgreSQL superuser account and a database in which to
store monitoring and replication data are required. Create them by store monitoring and replication data are required. Create them by
@@ -396,6 +399,18 @@ stored in the `repl_nodes` table.
Note that `repmgr` will fail with an error if this option is specified when Note that `repmgr` will fail with an error if this option is specified when
working with PostgreSQL 9.3. working with PostgreSQL 9.3.
Be aware that when initially cloning a standby, you will need to ensure
that all required WAL files remain available while the cloning is taking
place. If using the default `pg_basebackup` method, we recommend setting
`pg_basebackup`'s `--xlog-method` parameter to `stream` like this:
pg_basebackup_options='--xlog-method=stream'
See the `pg_basebackup` documentation [*] for details. Otherwise you'll need
to set `wal_keep_segments` to an appropriately high value.
[*] http://www.postgresql.org/docs/current/static/app-pgbasebackup.html
Further reading: Further reading:
* http://www.postgresql.org/docs/current/interactive/warm-standby.html#STREAMING-REPLICATION-SLOTS * http://www.postgresql.org/docs/current/interactive/warm-standby.html#STREAMING-REPLICATION-SLOTS
* http://blog.2ndquadrant.com/postgresql-9-4-slots/ * http://blog.2ndquadrant.com/postgresql-9-4-slots/