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troubleshooting.md: added #19 not enough ids #4583

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27 changes: 27 additions & 0 deletions troubleshooting.md
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Original file line number Diff line number Diff line change
Expand Up @@ -442,3 +442,30 @@ Attempts to run podman result in
#### Solution

One workaround is to disable Secure Boot in your BIOS.

### 19) error creating libpod runtime: there might not be enough IDs available in the namespace

Unable to pull images

#### Symptom

```console
$ podman unshare cat /proc/self/uid_map
0 1000 1
```

#### Solution

```console
$ podman system migrate
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@giuseppe giuseppe Nov 28, 2019

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this won' be enough if there are no IDs added for the user.

I think we should document that additional IDs must be provided through the /etc/subuid and /etc/subgid files.

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@nitrocode nitrocode Dec 2, 2019

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What additional content would you recommend? I can provide the outputs of those files at the very least.

$ cat /etc/subgid 
user:100000:65536
$ cat /etc/subuid
user:100000:65536

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@giuseppe giuseppe Dec 2, 2019

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I think we can add the example you just showed, and also warn the user about overlapping ranges. The IDs specified in these file must be unique for each user.

I'd also add a pointer to the subuid(5) and subgid(5) man pages.

```

Original command now returns

```
$ podman unshare cat /proc/self/uid_map
0 1000 1
1 100000 65536
```

Reference [subuid](http://man7.org/linux/man-pages/man5/subuid.5.html) and [subgid](http://man7.org/linux/man-pages/man5/subgid.5.html) man pages for more detail.