On 1/24/26 07:37, Kees Bakker wrote:
Hi,
My setup is a Ubuntu24 with an Incus server (6.20).
One Incus container runs Fedora 43 where I want to run non-root podman.
Inside the container
[root@f43 ~]# sudo -u fedora -i
[fedora@f43 ~]$ podman run -t -i hello-world
cannot clone: Permission denied
Error: cannot re-exec process
On the Ubuntu24 host I see this in journalctl
jan 24 16:33:41 rapper kernel: audit: type=1400 audit(1769268821.264:1554): apparmor="DENIED" operation="userns_create" class="namespace" info="Userns
create restricted - failed to find unprivileged_userns profile" error=-13 namespace="root//incus-f43_<var-lib-incus>" profile="unconfined" pid=2332667
comm="podman" requested="userns_create" denied="userns_create" target="unprivileged_userns"
My question, what do I have to do on the Ubuntu24 server to allow running
non-root podman?
Any help or suggestion is greatly appreciated.
you are encountering the unprivileged user namespace restriction(1-5).
You either need to confine the container, giving access to user namespaces, or
you need to disable the restriction.
to temporarily disable you can do
sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
to permanently disable
sudo bash -c "echo kernel.apparmor_restrict_unprivileged_userns=0 >
/etc/sysctl.d/60-apparmor-namespace.conf"
1. https://gitlab.com/apparmor/apparmor/-/wikis/unprivileged_userns_restriction
2.
https://discourse.ubuntu.com/t/understanding-apparmor-user-namespace-restriction/58007
3. https://discourse.ubuntu.com/t/plucky-puffin-release-notes/48687
4. https://ubuntu.com/blog/ubuntu-23-10-restricted-unprivileged-user-namespaces
5.
https://discourse.ubuntu.com/t/spec-unprivileged-user-namespace-restrictions-via-apparmor-in-ubuntu-23-10/37626
