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docs/userns: Clarify requirements for k8s 1.25/1.26

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crun 1.4.3 as well as runc 1.1 both support to open bind-mounts before
dropping privileges, as they are inaccessible after switching to the
user namespace. So that is the minimum version to use with containerd
1.7.

Also, since containerd 2.0 we use idmap mounts for files mounted in the
container created by containerd (like etc/hostname, etc/hosts, etc.), so
in that case we require newer OCI runtimes too. However, as the kubelet
doesn't request idmap mounts for kube volumes, we can lower the kernel
version.

Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
This commit is contained in:
Rodrigo Campos 2023-09-20 12:43:11 +02:00
parent 7a0e6b7e77
commit f1070c4e18
1 changed files with 14 additions and 2 deletions
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docs/user-namespaces/README.md
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@ -31,8 +31,20 @@ false` setting in your pod.spec will be **silently ignored**.
### Kubernetes 1.25 and 1.26
* Containerd 1.7 or greater
* runc 1.1 or greater
* Containerd 1.7
* You can use runc or crun as the OCI runtime:
* runc 1.1 or greater
* crun 1.4.3 or greater
You can also use containerd 2.0 or above, but the same [requirements as Kubernetes 1.27 and
greater](#Kubernetes-127-and-greater) apply, except for the Linux kernel. Bear in mind that all the
requirements there apply, including file-systems supporting idmap mounts. You can use Linux
versions:
* Linux 5.15: you will suffer from [the containerd 1.7 storage and latency
limitations](#Limitations), as it doesn't support idmap mounts for overlayfs.
* Linux 5.19 or greater (recommended): it doesn't suffer from any of the containerd 1.7
limitations, as overlayfs started supporting idmap mounts on this kernel version.
### Kubernetes 1.27 and greater