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Dockerfile.test: add "cri-in-userns" (aka rootless) test stage

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The `cri-in-userns` stage is for testing "CRI-in-UserNS", which should be used in conjunction with "Kubelet-in-UserNS":
https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/2033-kubelet-in-userns-aka-rootless

This feature is mostly expected to be used for `kind` and `minikube`.

Requires Rootless Docker/Podman/nerdctl with cgroup v2 delegation: https://rootlesscontaine.rs/getting-started/common/cgroup2/
(Rootless Docker/Podman/nerdctl prepares the UserNS, so we do not need to create UserNS by ourselves)

Usage:
```
podman build --target cri-in-userns -t cri-in-userns -f contrib/Dockerfile.test .
podman run -it --rm --privileged cri-in-userns
```

The stage is tested on CI with Rootless Podman on Fedora 34 on Vagrant.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
This commit is contained in:
Akihiro Suda
2021-07-08 18:24:14 +09:00
parent 0573e22e37
commit aefabe5462
5 changed files with 139 additions and 1 deletions
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22
contrib/Dockerfile.test
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@@ -58,3 +58,25 @@ COPY --from=proto3 /usr/local/include/google /usr/local/include/google
COPY --from=runc /usr/local/sbin/runc /usr/local/go/bin/runc
COPY . .
# cri-in-userns stage is for testing "CRI-in-UserNS", which should be used in conjunction with
# "Kubelet-in-UserNS": https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/2033-kubelet-in-userns-aka-rootless
# This feature is mostly expected to be used for `kind` and `minikube`.
#
# Requires Rootless Docker/Podman/nerdctl with cgroup v2 delegation: https://rootlesscontaine.rs/getting-started/common/cgroup2/
# (Rootless Docker/Podman/nerdctl prepares the UserNS, so we do not need to create UserNS by ourselves)
FROM dev AS cri-in-userns
RUN make BUILDTAGS="no_btrfs no_devmapper" binaries install
RUN apt-get update && apt-get install -y iptables
RUN ./script/setup/install-cni
RUN ./script/setup/install-critools
COPY contrib/Dockerfile.test.d/cri-in-userns/etc_containerd_config.toml /etc/containerd/config.toml
COPY contrib/Dockerfile.test.d/cri-in-userns/docker-entrypoint.sh /docker-entrypoint.sh
VOLUME /var/lib/containerd
ENTRYPOINT ["/docker-entrypoint.sh"]
# Skip "runtime should support unsafe sysctls": `container init caused: write sysctl key fs.mqueue.msg_max: open /proc/sys/fs/mqueue/msg_max: permission denied`
# Skip "runtime should support safe sysctls": `container init caused: write sysctl key kernel.shm_rmid_forced: open /proc/sys/kernel/shm_rmid_forced: permission denied`
# Skip "should allow privilege escalation when (NoNewPrivis is) false": expected log "Effective uid: 0\n" (stream="stdout") not found in logs [{timestamp:{wall:974487519 ext:63761339984 loc:<nil>} stream:stdout log:Effective uid: 1000) }]
CMD ["critest", "--ginkgo.skip=should support unsafe sysctls|should support safe sysctls|should allow privilege escalation when false"]
FROM dev AS default