How do I export import image?

[drjoms]

I download some semi-random image from some red hat registry or docker one.
Run container. It works.
Then I save said image.
Then I import it.
Then I try to run it:
podman container run ad9156f7bcd8
Error: no command or entrypoint provided, and no CMD or ENTRYPOINT from image

is there no simple way to make it work without 100+ obscure arguments?

I want to learn how I can take image from registry, take it to offline machine WITHOUT registry access, and import it from tar file or something and ACTUALLY run it, with minimal arguments, etc.

podman info
host:
arch: amd64
buildahVersion: 1.31.3
cgroupControllers:

• memory
• pids
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
  package: conmon-2.1.8-1.el9.x86_64
  path: /usr/bin/conmon
  version: 'conmon version 2.1.8, commit: cebaba63f66de0e92cdc7e2a59f39c9208281158'
  cpuUtilization:
  idlePercent: 99.83
  systemPercent: 0.09
  userPercent: 0.08
  cpus: 8
  databaseBackend: boltdb
  distribution:
  distribution: '"rocky"'
  version: "9.3"
  eventLogger: journald
  freeLocks: 2041
  hostname: VFIEVOX3.Router
  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: 5.14.0-362.13.1.el9_3.x86_64
    linkmode: dynamic
    logDriver: journald
    memFree: 6603571200
    memTotal: 8045084672
    networkBackend: netavark
    networkBackendInfo:
    backend: netavark
    dns:
    package: aardvark-dns-1.7.0-1.el9.x86_64
    path: /usr/libexec/podman/aardvark-dns
    version: aardvark-dns 1.7.0
    package: netavark-1.7.0-2.el9_3.x86_64
    path: /usr/libexec/podman/netavark
    version: netavark 1.7.0
    ociRuntime:
    name: crun
    package: crun-1.8.7-1.el9.x86_64
    path: /usr/bin/crun
    version: |-
    crun version 1.8.7
    commit: 53a9996ce82d1ee818349bdcc64797a1fa0433c4
    rundir: /run/user/1000/crun
    spec: 1.0.0
    +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
    os: linux
    pasta:
    executable: ""
    package: ""
    version: ""
    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-1.2.1-1.el9.x86_64
    version: |-
    slirp4netns version 1.2.1
    commit: 09e31e92fa3d2a1d3ca261adaeb012c8d75a8194
    libslirp: 4.4.0
    SLIRP_CONFIG_VERSION_MAX: 3
    libseccomp: 2.5.2
    swapFree: 6333394944
    swapTotal: 6333394944
    uptime: 4h 39m 27.00s (Approximately 0.17 days)
    plugins:
    authorization: null
    log:
• k8s-file
• none
• passthrough
• journald
  network:
• bridge
• macvlan
• ipvlan
  volume:
• local
  registries:
  search:
• registry.access.redhat.com
• registry.redhat.io
• docker.io
  store:
  configFile: /home/dseletski/.config/containers/storage.conf
  containerStore:
  number: 5
  paused: 0
  running: 0
  stopped: 5
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/dseletski/.local/share/containers/storage
  graphRootAllocated: 32728154112
  graphRootUsed: 1639043072
  graphStatus:
  Backing Filesystem: xfs
  Native Overlay Diff: "true"
  Supports d_type: "true"
  Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
  number: 1
  runRoot: /run/user/1000/containers
  transientStore: false
  volumePath: /home/dseletski/.local/share/containers/storage/volumes
  version:
  APIVersion: 4.6.1
  Built: 1702418000
  BuiltTime: Tue Dec 12 21:53:20 2023
  GitCommit: ""
  GoVersion: go1.20.10
  Os: linux
  OsArch: linux/amd64
  Version: 4.6.1

Thanks in advance.

[rhatdan]

If you inspect the old image and the new do the file look pretty much the same?

[drjoms]

Oh whoa, I did not expect to get a response from THE MAN himself!
I have read your book on Podman, clearly not well enough.

Please consider adding part where you can do save/load of an image :D
Because @nalind nailed it on a head!
Thanks for a cool book!

[drjoms]

is that Guinness in your hand? If you pass by Dublin, Ireland, ping me here - I will get you all Guinness you can drink ;)

[rhatdan]

That picture in on Shirken Island off of Baltimore in County Cork. Visiting grandparents home. But I prefer SmithWicks, but I am happy to have Guinness as well.

[drjoms]

Murphy's or O'Hara's or Beamish, offer still stands!
Take Nalin with you ;)

[nalind]

If you've used podman save to save the image, use podman load to load it elsewhere -- they use the same format, and the image's settings should be preserved. Even if podman import doesn't error out when pointed at a file created by podman save, I don't think the result will be what you want.

[drjoms]

thank you Nalind, that was exactly what I was looking for.
Simple save/load. As opposed to save/import...