The USER and GROUP options are the user and group as they appear in the container, while the HUSER and HGROUP options are the user and group as they appear on the host. You can see this result when I run podman top on my host system: code/podman.io (release_blog_1.5.0)$ podman top -l user group huser hgroup However, on the host, the bash process is still owned by my user. When I launch a rootless container as mheon with podman run -t -i -rm fedora bash, and then run top inside the container, I appear to be UID 0-root. On my system, my user ( mheon) is UID 1000. By default, we map the user that launched Podman as UID/GID 0 in rootless containers. Rootless containers run inside of a user namespace, which is a way of mapping the host’s users and groups into the container. I’ll start by explaining why we need to use different UIDs and GIDs than the host, and then explain why the default is 65536-and how to change this number. ![]() Why do the exact UIDs and GIDs in use matter?.Why can’t you use any image that works on normal Podman in rootless mode?.Due to that issue, the image would not fit into rootless Podman’s default UID mapping, which limits the number of UIDs and GIDs available. ![]() I explained that their problem was that their image had files owned by UIDs over 65536. ![]() How well do you know Linux? Take a quiz and get a badge.Linux system administration skills assessment.A guide to installing applications on Linux.Download RHEL 9 at no charge through the Red Hat Developer program.
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