nerdctl在创建容器过程中，会产生大量 /usr/local/bin/nerdctl _NERDCTL_INTERNAL_LOGGING /var/lib/nerdctl/1935db59 进程，占用大量内存

[natsql]

Description

nerdctl在创建容器过程中，会产生大量 /usr/local/bin/nerdctl _NERDCTL_INTERNAL_LOGGING /var/lib/nerdctl/1935db59 进程，占用大量内存

Steps to reproduce the issue

Describe the results you received and expected

不会产生这类进程： /usr/local/bin/nerdctl _NERDCTL_INTERNAL_LOGGING /var/lib/nerdctl/1935db59
因为这类进程实在是太多了，占用了大量进程

What version of nerdctl are you using?

Client:
Version: v0.23.0
OS/Arch: linux/amd64
Git commit: 660680b
buildctl:
Version: v0.10.4
GitCommit: a2ba6869363812a210fcc3ded6926757ab780b5f

Server:
containerd:
Version: v1.6.8
GitCommit: 9cd3357b7fd7218e4aec3eae239db1f68a5a6ec6
runc:
Version: 1.1.4
GitCommit: v1.1.4-0-g5fd4c4d1

Are you using a variant of nerdctl? (e.g., Rancher Desktop)

No response

Host information

No response

[Zheaoli]

Would you mind describing the problem using English?

[natsql]

When nerdctl creates a container, a large number of /usr/local/bin/nerdctl _NERDCTL_INTERNAL_LOGGING /var/lib/nerdctl/1935db59 processes will be generated, occupying a lot of memory

[natsql]

At the same time, a large number of useless processes such as /usr/local/bin/containerd-shim-runc-v2 -namespace default -id 1bd8240eed267bdacf0670649908da30d6f05529a1d69f5ed1d9d8f8694e0bd7 -address /run/containerd/containerd.sock. because 1bd8240eed267bdacf0670649908da30d6f05529a1d69f5ed1d9d8f8694e0bd7 corresponding container have exited

[Zheaoli]

I think it's not a bug. It's a special callback to let contained push logs to the nerdctl. FYI https://github.com/containerd/nerdctl/blob/master/cmd/nerdctl/run.go#L882-L895

[natsql]

I think it's not a bug. It's a special callback to let contained push logs to the nerdctl. FYI https://github.com/containerd/nerdctl/blob/master/cmd/nerdctl/run.go#L882-L895

After the log is pushed, why not close the process?

[natsql]

I found that nerdctl uses more memory than docker, if so, why should I use nerdctl?

[Zheaoli]

This process needs to exist until the container has been exited because the containerd will send the log to the process's stdin, and the nerdctl will read the log continually.