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users-and-groups: Document useradd httpd more #501

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May 1, 2024
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users-and-groups: Document useradd httpd more #501

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20 changes: 16 additions & 4 deletions docs/src/building/users-and-groups.md
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Expand Up @@ -64,10 +64,22 @@ users and credentials as part of a derived build:
RUN useradd someuser
```

However, it is important to understand some issues with the default
`shadow-utils` implementation of `useradd`:

First, typically user/group IDs are allocated dynamically, and this can result in "drift" (see below).
However, it is important to understand some two very important issues
with this as it exists today (the `shadow-utils` implementation of `useradd`)
and the default glibc `files` backend for the traditional `/etc/passwd`
and `/etc/shadow` files.

It is common for user/group IDs are allocated dynamically, and this can result in "drift" (see below).

Further, if `/etc/passwd` is modified locally (because there is a machine-local user),
then any added users injected via `useradd` *will not appear* on subsequent updates by default (they will be
in `/usr/etc/passwd` instead - the default image version).

These "system users" that may be created by packaging tools invoking `useradd` (e.g. `apt|dnf install httpd`) that do
not also install a `sysusers.d` file. Currently for example, this is the case with
the CentOS Stream 9 `httpd` package. Per below, the general solution to this
is to avoid invoking `useradd` in container builds, and prefer one of the below
solutions.

#### User and group home directories and `/var`

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