Feature request: Add support for "slirp4netns" networking to allow local image registry connectivity with KIND.

[mondo192]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind feature

Description

I'm trying to create a local repository on my machine to store images for containers. Then use the local image repository with Kubernetes IN Docker (KIND) in this case Kubernetes IN Podman. However, when I try to connect the local registry to KIND's network, in order to be able to pull images, it fails. The error message is Error: "slirp4netns" is not supported: invalid network mode.

Steps to reproduce the issue:

1. sudo mkdir -p /var/lib/registry

2. podman run --privileged -d --name registry -p 5000:5000 -v /var/lib/registry:/var/lib/registry --restart=always registry:2

3. go install sigs.k8s.io/[email protected]

4. KIND_EXPERIMENTAL_PROVIDER=podman kind create cluster

5. podman network connect kind registry

Describe the results you received:
Error: "slirp4netns" is not supported: invalid network mode

Describe the results you expected:
No error and be then able to pull images from the local registry

Additional information you deem important (e.g. issue happens only occasionally):

Output of podman version:

Version:      3.4.4
API Version:  3.4.4
Go Version:   go1.16.8
Built:        Wed Dec  8 21:45:07 2021
OS/Arch:      linux/amd64

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.23.1
  cgroupControllers:
  - memory
  - pids
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.0-2.fc35.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.0, commit: '
  cpus: 12
  distribution:
    distribution: fedora
    variant: workstation
    version: "35"
  eventLogger: journald
  hostname: fedora
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
  kernel: 5.16.16-200.fc35.x86_64
  linkmode: dynamic
  logDriver: journald
  memFree: 7574327296
  memTotal: 16438108160
  ociRuntime:
    name: crun
    package: crun-1.4.3-1.fc35.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.4.3
      commit: 61c9600d1335127eba65632731e2d72bc3f0b9e8
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  os: linux
  remoteSocket:
    path: /run/user/1000/podman/podman.sock
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.1.12-2.fc35.x86_64
    version: |-
      slirp4netns version 1.1.12
      commit: 7a104a101aa3278a2152351a082a6df71f57c9a3
      libslirp: 4.6.1
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.3
  swapFree: 8589930496
  swapTotal: 8589930496
  uptime: 22m 56.09s
plugins:
  log:
  - k8s-file
  - none
  - journald
  network:
  - bridge
  - macvlan
  volume:
  - local
registries:
  localhost:5000:
    Blocked: false
    Insecure: true
    Location: localhost:5000
    MirrorByDigestOnly: false
    Mirrors: null
    Prefix: localhost:5000
  registry.kube:
    Blocked: false
    Insecure: true
    Location: registry.kube
    MirrorByDigestOnly: false
    Mirrors: null
    Prefix: registry.kube
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - docker.io
  - quay.io
store:
  configFile: /home/eamonn/.config/containers/storage.conf
  containerStore:
    number: 2
    paused: 0
    running: 2
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/eamonn/.local/share/containers/storage
  graphStatus:
    Backing Filesystem: btrfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Using metacopy: "false"
  imageStore:
    number: 2
  runRoot: /run/user/1000/containers
  volumePath: /home/eamonn/.local/share/containers/storage/volumes
version:
  APIVersion: 3.4.4
  Built: 1638999907
  BuiltTime: Wed Dec  8 21:45:07 2021
  GitCommit: ""
  GoVersion: go1.16.8
  OsArch: linux/amd64
  Version: 3.4.4

Package info (e.g. output of rpm -q podman or apt list podman):

podman-3.4.4-1.fc35.x86_64

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/main/troubleshooting.md)

No

Additional environment details (AWS, VirtualBox, physical, etc.):

[Luap99]

When you start the container with slirp4nents you cannot connect it to other networks (bridge mode).
Why not just start the registry container directly with --network kind or you have to start the container with --network bridge so you connect more networks later.

I don't think we want to support mixing network modes so I am closing this one.