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Update postgres "arbitrary user" notes to reference new nss_wrapper functionality #1239

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May 25, 2018
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Update postgres "arbitrary user" notes to reference new nss_wrapper functionality #1239

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8 changes: 5 additions & 3 deletions postgres/content.md
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Expand Up @@ -106,17 +106,19 @@ $ docker run -it --rm --user 1000:1000 %%IMAGE%%
initdb: could not look up effective user ID 1000: user does not exist
```

The two easiest ways to get around this:
The three easiest ways to get around this:

1. bind-mount `/etc/passwd` read-only from the host (if the UID you desire is a valid user on your host):
1. use the Debian variants (not the Alpine variants) and thus allow the image to use [the `nss_wrapper` library](https://cwrap.org/nss_wrapper.html) to "fake" `/etc/passwd` contents for you (see [docker-library/postgres#448](https://github.com/docker-library/postgres/pull/448) for more details)

2. bind-mount `/etc/passwd` read-only from the host (if the UID you desire is a valid user on your host):

```console
$ docker run -it --rm --user "$(id -u):$(id -g)" -v /etc/passwd:/etc/passwd:ro %%IMAGE%%
The files belonging to this database system will be owned by user "jsmith".
...
```

2. initialize the target directory separately from the final runtime (with a `chown` in between):
3. initialize the target directory separately from the final runtime (with a `chown` in between):

```console
$ docker volume create pgdata
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