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troubleshooting: document keep-id size option #28631

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Honny1 merged 1 commit into from
May 4, 2026
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troubleshooting: document keep-id size option #28631

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4 changes: 3 additions & 1 deletion troubleshooting.md
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Expand Up @@ -1449,7 +1449,9 @@ Using `--userns=auto` when creating new containers does not work as long as any

#### Solution

Any existing containers that were created using `--userns=keep-id` or `--userns=nomap` must first be deleted before any new container can be created with `--userns=auto`
Any existing containers that were created using `--userns=keep-id` or `--userns=nomap` must first be deleted before any new container can be created with `--userns=auto`.
By default, the option `--userns=keep-id` allocates all unused IDs in the user namespace.
To avoid this, specify the `size` option, for example `--userns=keep-id:size=2000`

### 44) `sudo podman run --userns=auto` fails with `Cannot find mappings for user "containers"`

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