Bug 1872240
| Summary: | Try to automatically load fuse module if users forget to do it when starting a nested container | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Alex Jia <ajia> |
| Component: | podman | Assignee: | Giuseppe Scrivano <gscrivan> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Alex Jia <ajia> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 8.3 | CC: | bbaude, dwalsh, gscrivan, jligon, jnovy, lsm5, mheon, tsweeney, ypu |
| Target Milestone: | rc | ||
| Target Release: | 8.0 | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2022-01-26 10:51:42 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
Alex Jia
2020-08-25 09:17:34 UTC
I am fine if we add a better error message, but I am not sure we should try to automatically load the kernel module. Would it be an acceptable solution? Parker can you take a run at this one please? Lets keep Parker concentrating on Short Names. Giuseppe can you take care of this? Is there a way we can trigger this automatically in Podman. Currently the kernel loads some kernel modules automatically on first use of a device. SELinux is blocking this for the container. I wonder if podman just opened and closed the /dev/fuse device, if it would trigger the load and this would work in rootless and rootfull mode. It also would be less invasive then this change. I believe the issue here is that the confined container is the first on on the system to use /dev/fuse, so container_t process triggers a kernel module load, which is blocked. If podman triggers the load then everything is happy. The patch https://github.com/containers/podman/pull/7456/files works for me. [root@hp-dl360g9-03 libpod]# git rev-parse HEAD b4a10538e1a094f407b581572f8cb3e55656d470 [root@hp-dl360g9-03 libpod]# lsmod|grep fuse fuse 131072 0 [root@hp-dl360g9-03 libpod]# modprobe -r fuse [root@hp-dl360g9-03 libpod]# lsmod|grep fuse [root@hp-dl360g9-03 libpod]# ./bin/podman run --rm --device /dev/fuse -it registry-proxy.engineering.redhat.com/rh-osbs/rhel8-buildah:8.3-13 /bin/bash Trying to pull registry-proxy.engineering.redhat.com/rh-osbs/rhel8-buildah:8.3-13... Getting image source signatures Copying blob 9598d2bbd6ed done Copying blob ccd0627b3ce2 done Copying blob d02623442d02 done Copying config f6b40a46c0 done Writing manifest to image destination Storing signatures [root@c1962238e275 /]# rpm -q buildah fuse-overlayfs buildah-1.15.1-2.module+el8.3.0+8221+97165c3f.x86_64 fuse-overlayfs-1.1.2-3.module+el8.3.0+8221+97165c3f.x86_64 [root@c1962238e275 /]# buildah info { "host": { "CgroupVersion": "v1", "Distribution": { "distribution": "\"rhel\"", "version": "8.3" }, "MemTotal": 16513163264, "MenFree": 1162301440, "OCIRuntime": "runc", "SwapFree": 8382836736, "SwapTotal": 8409575424, "arch": "amd64", "cpus": 12, "hostname": "c1962238e275", "kernel": "4.18.0-190.el8.x86_64", "os": "linux", "rootless": true, "uptime": "3246h 30m 44.68s (Approximately 135.25 days)" }, "store": { "ContainerStore": { "number": 0 }, "GraphDriverName": "overlay", "GraphOptions": [ "overlay.imagestore=/var/lib/shared", "overlay.mount_program=/usr/bin/fuse-overlayfs", "overlay.mountopt=nodev,metacopy=on" ], "GraphRoot": "/var/lib/containers/storage", "GraphStatus": { "Backing Filesystem": "overlayfs", "Native Overlay Diff": "false", "Supports d_type": "true", "Using metacopy": "false" }, "ImageStore": { "number": 0 }, "RunRoot": "/var/run/containers/storage" } } [root@c1962238e275 /]# buildah --storage-opt=overlay.mount_program=/usr/bin/fuse-overlayfs from registry.access.redhat.com/ubi8 Getting image source signatures Copying blob c4d668e229cd done Copying blob ec1681b6a383 done Copying config ecbc6f53bb done Writing manifest to image destination Storing signatures ubi8-working-container [root@c1962238e275 /]# buildah ps CONTAINER ID BUILDER IMAGE ID IMAGE NAME CONTAINER NAME 88ff17a5c051 * ecbc6f53bba0 registry.access.redhat.com/ub... ubi8-working-container [root@c1962238e275 /]# buildah --storage-opt=overlay.mount_program=/usr/bin/fuse-overlayfs run --isolation=chroot ubi8-working-container ls / bin boot dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var [root@c1962238e275 /]# exit exit [root@hp-dl360g9-03 libpod]# lsmod|grep fuse fuse 131072 0 |