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troubleshooting.md: add note about updating subuid/subgid

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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Giuseppe Scrivano
2019-05-09 11:03:11 +02:00
parent 9dabb16e65
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@ -247,6 +247,11 @@ would potentially allow one user to attack another user.
You could also use the usermod program to assign UIDs to a user.
If you update either the /etc/subuid or /etc/subgid file, you need to
stop all running containers and kill the pause process. This is done
automatically by the `system migrate` command, which can also be used
to stop all the containers and kill the pause process.
```
usermod --add-subuids 200000-201000 --add-subgids 200000-201000 johndoe
grep johndoe /etc/subuid /etc/subgid