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Document postgres POSTGRES_INITDB_XLOGDIR variable #872

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Apr 6, 2017
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Document postgres POSTGRES_INITDB_XLOGDIR variable #872

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Expand Up @@ -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`.
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