How to attach a container using nerdctl attach

[haytok]

Question

If we try to attach to a container that has been started as shown below, the following error will occur.

[haytok@lima-finch workspace]$ sudo nerdctl run --name test -d alpine sh -c "while true; do echo /'Hello, world/'; sleep 1; done"
54f605cda9b8184a5d16a543ba482dfaa1a90d3e71d9903c19b667bd202f5b18
[haytok@lima-finch workspace]$ sudo nerdctl ps
CONTAINER ID    IMAGE                              COMMAND                   CREATED          STATUS    PORTS    NAMES
54f605cda9b8    docker.io/library/alpine:latest    "sh -c while true; d…"    3 seconds ago    Up                 test
[haytok@lima-finch workspace]$ sudo nerdctl attach test
FATA[0000] failed to attach to the container: failed to open stdout fifo: error creating fifo binary:///usr/local/bin/nerdctl?_NERDCTL_INTERNAL_LOGGING=%2Fvar%2Flib%2Fnerdctl%2F1935db59: no such file or directory

Is this the expected behavior?

There seems to be an error in the following part of nerdctl, but I'm in trouble because I don't know how to fix it.

• https://github.com/containerd/nerdctl/blob/main/pkg/cmd/container/attach.go#L96C1-L99C3

• nerdctl/pkg/cioutil/container_io_unix.go

  Line 122 in 9ce158b

  return f, fmt.Errorf("failed to open stdout fifo: %w", retErr)

Note that Docker doesn't cause such an error, and we can attach it to a container.

Environments

I'm using the following versions of containerd and nerdctl.

[haytok@lima-finch workspace]$ containerd --version
containerd github.com/containerd/containerd v1.7.13 7c3aca7a610df76212171d200ca3811ff6096eb8
[haytok@lima-finch workspace]$ nerdctl version
WARN[0000] failed to inspect the rootless containerd socket address  error="stat /run/user/504/containerd-rootless: no such file or directory"
Client:
 Version:	v1.7.3
 OS/Arch:	linux/amd64
 Git commit:	0a464409d0178e16d3d2bed36222937ec3fc9c77
 buildctl:
  Version:	v0.12.5
  GitCommit:	bac3f2b673f3f9d33e79046008e7a38e856b3dc6

Note that containerd and nerdctl are running in Lima launched from Finch.

[AkihiroSuda]

This is a bug report, not a "question" 🙂

[haytok]

@AkihiroSuda

Thanks for comments !!!
I'll raise an issue for this behavior.

[AkihiroSuda]

Issue

• failed to attach to the container: failed to open stdout fifo: error creating fifo binary:///usr/local/bin/nerdctl?_NERDCTL_INTERNAL_LOGGING=%2Fvar%2Flib%2Fnerdctl%2F1935db59: no such file or directory #2877

[haytok]

Thanks !!!!

[haytok]

!'ll check related PR and investigate root case.