Why nerdctl can create duplicate containers

[llody55]

Description

I created two containers with the same name when running two identical nerdctl run commands. Is this allowed?

Steps to reproduce the issue

1.Create a container
nerdctl run -d --hostname rabbitmq-1-244 --name rabbitmq-1-244 -e RABBITMQ_DEFAULT_USER="admin" -e RABBITMQ_DEFAULT_PASS="admin" -e RABBITMQ_DEFAULT_VHOST=/ --restart=always -p "4369:4369" -p "5672:5672" -p "15672:15672" -p "25672:25672" -p"15692:15692" -v /data/rabbitmq/:/var/lib/rabbitmq arm64v8/rabbitmq:3.9.11-management
2.Create another identical container
nerdctl run -d --hostname rabbitmq-1-244 --name rabbitmq-1-244 -e RABBITMQ_DEFAULT_USER="admin" -e RABBITMQ_DEFAULT_PASS="admin" -e RABBITMQ_DEFAULT_VHOST=/ --restart=always -p "4369:4369" -p "5672:5672" -p "15672:15672" -p "25672:25672" -p"15692:15692" -v /data/rabbitmq/:/var/lib/rabbitmq arm64v8/rabbitmq:3.9.11-management

Describe the results you received and expected

You should be prompted that the container name is duplicated or something like that.

What version of nerdctl are you using?

nerdctl version 1.5.0
containerd-1.6.10-linux-arm64

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

None

Host information

[root@node1 ~]# uname -a
Linux node1 5.10.0-153.27.0.103.oe2203sp2.aarch64 #1 SMP Wed Sep 13 19:04:10 CST 2023 aarch64 aarch64 aarch64 GNU/Linux
[root@node1 ~]# nerdctl -v
nerdctl version 1.5.0
[root@node1 ~]# ctr -v
ctr github.com/containerd/containerd v1.6.10

[AkihiroSuda]

Explicitly allowed:

• nerdctl/pkg/labels/labels.go

  Lines 28 to 30 in a152779

  	// Name is a human-friendly name.
  	// WARNING: multiple containers may have same the name label
  	Name = Prefix + "name"

The ID has to be unique, but the name does not.

[llody55]

In my experiment, I ran two identical commands. Not only did the container names have the same name, but the port mappings were also repeated. Is this allowed?

[fahedouch]

host exposed ports ?

[llody55]

@fahedouch Yes, the two commands are exactly the same and map the port to the host at the same time.