0.7.0 spegel release supports containerd 1.7 on our own risk, or does not support completely?

[maxout123]

Releases page says "For Containerd, Spegel supports versions from 1.7 onward that are under active maintenance"

#1168 says it removes support for Containerd 1.7.

That is, Spegel 0.7.0 will or will not work with Containerd 1.7?

[phillebaba]

The documentation needs to be updated. I should probably remove any mention of a specific minimum version there and reference the code instead. I will update the docs to reflect the truth.

Containerd 1.7 was going to be deprecated a long time but the date kept getting pushed, and was supposed to deprecated in March this year. The maintainers who are keeping support are doing it specifically for GKE clusters running Kubernetes versions that we dont test against anymore.

Support for the 1.7 release branch was provided by @containerd/committers until March 10, 2026. Extended support through September 2026 is provided by @samuelkarp and @chrishenzie . This extended support is focused on usage with Kubernetes 1.32, 1.31, and 1.30 via Google Kubernetes Engine . Changes may not be accepted if they are not needed for this usage.

Keeping support for 1.7 would mean more work accounting for the missing features and also the difference in configuration. This makes both the code and documentation more time consuming to keep up to date. The major Kubernetes flavors made the migration to Containerd 2.1 a while ago. The only users that may be sticking with 1.7 still are enterprises who are unable to upgrade for one reason or another.

[maxout123]

Hi, could you please explain long story short, if we are using Containerd 1.7 (and unable to upgrade), can we install Spegel 0.7, or we MUST install Spegel 0.6, as 0.7 won't work with containerd 1.7 at all?

[phillebaba]

I think Spegel v0.7.0 will start with Containerd 1.7 but it wont serve layers properly. So it will silently not work, which is why I considered adding a version test. If you are running Containerd v1.7 you are stuck using Spegel v0.6.0.

What is stopping you from upgrading to Containerd 2.1? You have until September which isn't much time. Kubernetes 1.35 was also the last release that will support Containerd 1.7 so you cant upgrade any further than that either.

[maxout123]

We are using private cloud solution with managed K8s, vendor doesn't provide any other Containerd execept 1.7, so we have no choice (and no possibility to upgrade to Containerd 2.1 manually)

[maxout123]

Thanks for the information, we will keep Spegel v0.6.0