troubleshooting.md: add note about updating subuid/subgid

Signed-off-by: Giuseppe Scrivano <[email protected]>
mtrmac · May 17, 2019 · 53a7622 · 53a7622
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diff --git a/troubleshooting.md b/troubleshooting.md
@@ -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