Podman: unable to upgrade to tcp, received 500
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 52/100
Research direction
Start at the crossplane composition render entry point and trace the internal render-in-Docker path that attaches to the function container. Reproduce with a rootful Podman machine and compare the failing container-attach behavior with the working 2.2.0 release; done means rendering succeeds on the reported Podman setup.
Written by the indexing model from the issue text.
Description
What happened?
Since the update to 2.3.0 the crossplane cli is not working anymore in my setup.
Version 2.2.0 is running without any issues.
I am using podman with rootful setup.
How can we reproduce it?
- Install podman 6.1.0
- Create rootful machine
- Try "crossplane composition render"
- Fail with:
2026-08-21T18:28:39+02:00 DEBUG Function container reachable on network {"network": "crossplane-render-9jnm6ht7", "address": "hardcore_hodgkin:9443"}
2026-08-21T18:28:39+02:00 DEBUG Running crossplane internal render in Docker {"image": "xpkg.crossplane.io/crossplane/crossplane:stable", "network": "crossplane-render-9jnm6ht7"}
crossplane: error: cannot render composite resource: crossplane internal render in Docker returned error with output: : failed to attach to container: unable to upgrade to tcp, received 500
What environment did it happen in?
- Crossplane CLI version: 2.3.0 -> 2.5.0
- Platform (e.g., linux/amd64): macos arm64
- Crossplane version (if applicable):
- Dominant language
- Go
- Stars
- 19
- Forks
- 31
- Avg merge
- 2d 15h
- Merged PRs (30d)
- 53
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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