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Document postgres POSTGRES_INITDB_XLOGDIR variable 

docker-library/postgres#224 and docker-library/official-images#2762 added the POSTGRES_INITDB_XLOGDIR variable. This adds documentation for that variable.
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Daniel Dent 2017-04-05 21:29:25 -07:00 committed by Daniel Dent
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@ -68,6 +68,10 @@ This optional environment variable can be used to define a different name for th
This optional environment variable can be used to send arguments to `postgres initdb`. The value is a space separated string of arguments as `postgres initdb` would expect them. This is useful for adding functionality like data page checksums: `-e POSTGRES_INITDB_ARGS="--data-checksums"`.
### `POSTGRES_INITDB_XLOGDIR`
This optional environment variable can be used to define another location for the Postgres transaction log. By default the transaction log is stored in a subdirectory of the main Postgres data folder (`PGDATA`). Sometimes it can be desireable to store the transaction log in a different directory which may be backed by storage with different performance or reliability characteristics.
## Arbitrary `--user` Notes
As of [docker-library/postgres#253](https://github.com/docker-library/postgres/pull/253), this image supports running as a (mostly) arbitrary user via `--user` on `docker run`.