ansible + podman not working #4813

dschier-wtd · 2020-01-08T08:48:27Z

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

/kind bug

Description

I am using ansible to interact with podman via ansible podman connector. when using a rootless container, I am not able to execute any command via ansible and will get some errors. The command that should be executed is a simple cat /etc/hostname

This may not be 100% related to podman, but maybe to the ansible code (podman connector), since podman cp works in general.

Errors:

Error: cannot copy into running rootless container with pause set - pass --pause=false to force copying\\n

Steps to reproduce the issue:

Start a container as user

podman run -d --rm --name instance fedora:31 sleep 300

Execute some ansible

ansible instance -c podman -m setup -i inventory

instance = name of the container
inventory file = a plain file with the word instance in it

Describe the results you received:

Error: cannot copy into running rootless container with pause set - pass --pause=false to force copying\\n

Describe the results you expected:

either a working execution or some hints, how to manipulate the "pause" behaviour.

Output of podman version:

Version:            1.6.2
RemoteAPI Version:  1
Go Version:         go1.13.1
OS/Arch:            linux/amd64

Output of podman info --debug:

debug:
  compiler: gc
  git commit: ""
  go version: go1.13.1
  podman version: 1.6.2
host:
  BuildahVersion: 1.11.3
  CgroupVersion: v2
  Conmon:
    package: conmon-2.0.2-1.fc31.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.0.2, commit: 186a550ba0866ce799d74006dab97969a2107979'
  Distribution:
    distribution: fedora
    version: "31"
  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
  MemFree: 9151815680
  MemTotal: 16602112000
  OCIRuntime:
    name: crun
    package: crun-0.10.6-1.fc31.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 0.10.6
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  SwapFree: 8371826688
  SwapTotal: 8371826688
  arch: amd64
  cpus: 8
  eventlogger: journald
  hostname: nb01
  kernel: 5.4.7-200.fc31.x86_64
  os: linux
  rootless: true
  slirp4netns:
    Executable: /usr/bin/slirp4netns
    Package: slirp4netns-0.4.0-20.1.dev.gitbbd6f25.fc31.x86_64
    Version: |-
      slirp4netns version 0.4.0-beta.3+dev
      commit: bbd6f25c70d5db2a1cd3bfb0416a8db99a75ed7e
  uptime: 21h 3m 30.47s (Approximately 0.88 days)
registries:
  blocked: null
  insecure: null
  search:
  - docker.io
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - registry.centos.org
  - quay.io
store:
  ConfigFile: /var/home/dschier/.config/containers/storage.conf
  ContainerStore:
    number: 4
  GraphDriverName: overlay
  GraphOptions:
    overlay.mount_program:
      Executable: /usr/bin/fuse-overlayfs
      Package: fuse-overlayfs-0.7.2-2.fc31.x86_64
      Version: |-
        fusermount3 version: 3.6.2
        fuse-overlayfs: version 0.7.2
        FUSE library version 3.6.2
        using FUSE kernel interface version 7.29
  GraphRoot: /var/home/dschier/.local/share/containers/storage
  GraphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "false"
  ImageStore:
    number: 10
  RunRoot: /run/user/1000
  VolumePath: /var/home/dschier/.local/share/containers/storage/volumes

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

podman-manpages-1.6.2-2.fc31.noarch

The text was updated successfully, but these errors were encountered:

dschier-wtd · 2020-01-08T08:56:01Z

I have also opened a bug for the ansible devs

ansible/ansible#66263

sshnaidm · 2020-01-08T09:32:55Z

@daniel-wtd I think it should have been fixed in d40b450
I can't currently reproduce it, for me it works with same podman and ansible versions. We have a little bit different builds https://linediff.com/?id=5e15a11d687f4b2e6e8b4567 but it doesn't seems as critical.
Will look again what can be wrong

sshnaidm · 2020-01-08T09:36:07Z

@daniel-wtd please paste your "ansible --version"

dschier-wtd · 2020-01-08T09:43:19Z

Thanks for having a look. Below you can find my ansible version

ansible 2.9.2
  config file = None
  configured module search path = ['/var/home/dschier/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /var/home/dschier/.venv-python3/lib64/python3.7/site-packages/ansible
  executable location = /var/home/dschier/.venv-python3/bin/ansible
  python version = 3.7.5 (default, Dec 15 2019, 17:54:26) [GCC 9.2.1 20190827 (Red Hat 9.2.1-1)]

sshnaidm · 2020-01-08T09:59:20Z

@daniel-wtd thanks, also the same. Do you have a possibility to try it on a fresh system? I'll try to do the same today on f31

dschier-wtd · 2020-01-08T10:37:52Z

yep, will do this today in the evening (CET) and report back to you.

dschier-wtd · 2020-01-08T21:16:12Z

I have tested it a on 2 fresh installations minute ago:

fedora 31 (silverblue / iot)
podman 1.6.2
ansible 2.9.2 (via pip / overlay package)

and got the same result.

dschier-wtd · 2020-01-08T22:14:13Z

minor addition: on the same host running the exact same stuff as root is working perfectly fine.

sshnaidm · 2020-01-09T12:07:41Z

OK, I reproduced it on the fresh fedora31 system:

fedora@localhost ~]$ podman run -d --rm --name instance fedora:31 sleep 1h
9f894952cb740f2d7aae0ccb5e4e688dfe256f04835693acbbf86e103c3bc716
[fedora@localhost ~]$ podman cp /home/fedora/myfile instance:/root/
Error: cannot copy into running rootless container with pause set - pass --pause=false to force copying
[fedora@localhost ~]$ podman cp --pause=false /home/fedora/myfile instance:/root/
[fedora@localhost ~]$ podman version
Version:            1.6.2
RemoteAPI Version:  1
Go Version:         go1.13.1
OS/Arch:            linux/amd64

@mheon @rhatdan any ideas why it works on fedora30 with d40b450 but doesn't work on fedora31? With same podman version 1.6.2

mheon · 2020-01-09T14:23:05Z

CGroups v2, maybe? Pause requires CGroups which for rootless containers are only available on v2.

…

On Thu, Jan 9, 2020, 07:07 Sergey ***@***.***> wrote: OK, I reproduced it on the fresh fedora31 system: ***@***.*** ~]$ podman run -d --rm --name instance fedora:31 sleep 1h 9f894952cb740f2d7aae0ccb5e4e688dfe256f04835693acbbf86e103c3bc716 ***@***.*** ~]$ podman cp /home/fedora/myfile instance:/root/ Error: cannot copy into running rootless container with pause set - pass --pause=false to force copying ***@***.*** ~]$ podman cp --pause=false /home/fedora/myfile instance:/root/ ***@***.*** ~]$ podman version Version: 1.6.2 RemoteAPI Version: 1 Go Version: go1.13.1 OS/Arch: linux/amd64 @mheon <https://github.com/mheon> @rhatdan <https://github.com/rhatdan> any ideas why it works on fedora30 with d40b450 <d40b450> but doesn't work on fedora31? With same podman version 1.6.2 — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#4813>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB3AOCED23EI3FZ2FMKAAULQ44HQ5ANCNFSM4KEEZUHQ> .

sshnaidm · 2020-01-09T14:48:49Z

@mheon yeah, seems like it's cgroups. It works fine with cgroups v1, but doesn't work with v2. Still not sure why it ignores default setting from d40b450
Should we set "--pause false" explicitly in ansible plugin? https://github.com/ansible/ansible/blob/devel/lib/ansible/plugins/connection/podman.py#L165-L166

CGroups v2, maybe? Pause requires CGroups which for rootless containers are only available on v2.

mheon · 2020-01-09T15:15:41Z

Might be a good idea.

mheon · 2020-01-09T15:16:03Z

@giuseppe We expect pause to work rootless on v2, correct?

giuseppe · 2020-01-09T15:26:05Z

@giuseppe We expect pause to work rootless on v2, correct?

yes, pause should work on cgroup v2 as rootless as well

sshnaidm · 2020-01-09T18:18:35Z

As I see in code pause=false is default only with cgroups v1 and it's what causes problems for fedora31. Is that a specific reason for it? https://github.com/containers/libpod/blob/f85b3a01f050e4f8af8471f396013f18647d9241/cmd/podman/cp.go#L496
@giuseppe @mheon ^^

mheon · 2020-01-09T18:34:56Z

It sounds like we expect pause to work for CGroups v2, so the fact that it's not is probably a bug

sshnaidm · 2020-01-09T18:52:40Z

@mheon so should we stop to require pause=False on cgroups v2 for rootless containers?
If I set now explicitly --pause false in ansible module - will it break some higher/future versions..? Would be better to have it solved in podman maybe.

giuseppe · 2020-01-10T10:22:05Z

If pause can be performed in rootless depends whether we are using cgroups v2, the systemd manager and the freezer controller is available (it wasn't on older kernels for cgroup v2). The last condition can fail for root as well.

I think we should just drop the check and let the OCI runtime complain if pause cannot be performed.

rootless containers can use pause on cgroups v2. Whether it is possible or not to use pause depends from multiple conditions, such as: - be on a cgroup v2 unified hierarchy, - using systemd cgroup manager, - the kernel has the freezer controller, The last one may fail for root as well. Instead of trying to catch all the possible conditions in Podman, let the OCI runtime complain if pause cannot be performed. Closes: containers#4813 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

giuseppe · 2020-01-10T10:26:51Z

PR here: #4828

sshnaidm · 2020-01-12T17:53:49Z

@giuseppe thanks! Will it be ported to 1.6.2 or later? Because if I change ansible plugin to use "--pause false" now, it might be broken for later podman? Or I miss something?

giuseppe · 2020-01-13T09:05:37Z

@giuseppe thanks! Will it be ported to 1.6.2 or later? Because if I change ansible plugin to use "--pause false" now, it might be broken for later podman? Or I miss something?

I don't think this will be back ported as it is not a security problem. @mheon or we could backport it?

mheon · 2020-01-13T14:16:17Z

Probably not. Anything not long term should move rapidly to 1.7.0, while long term releases are on a critical security or bugfix basis.

…

On Mon, Jan 13, 2020, 04:05 Giuseppe Scrivano ***@***.***> wrote: @giuseppe <https://github.com/giuseppe> thanks! Will it be ported to 1.6.2 or later? Because if I change ansible plugin to use "--pause false" now, it might be broken for later podman? Or I miss something? I don't think this will be back ported as it is not a security problem. @mheon <https://github.com/mheon> or we could backport it? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#4813>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB3AOCG2CTNFD5XFY5FL2YLQ5QVGFANCNFSM4KEEZUHQ> .

rhatdan · 2020-01-13T16:32:55Z

Yes no back porting, unless absolutely necessary.

samdoran · 2020-01-17T21:44:12Z

I merged the fix for this in Ansible (ansible/ansible#66583) and opened a backport to stable-2.9. It should be in the next 2.9 release.

dschier-wtd · 2020-02-09T07:04:10Z

with 1.8.0 on fedora, everything is working fine :)

rhatdan · 2020-02-10T12:51:00Z

Awesome.

openshift-ci-robot added the kind/bug Categorizes issue or PR as related to a bug. label Jan 8, 2020

dschier-wtd mentioned this issue Jan 8, 2020

ansible + podman connector not working ansible/ansible#66263

Closed

giuseppe mentioned this issue Jan 10, 2020

cp: drop check for rootless #4828

Merged

openshift-merge-robot closed this as completed in #4828 Jan 10, 2020

sshnaidm mentioned this issue Jan 19, 2020

Transition of ansible modules for podman to a new place #4654

Closed

sshnaidm mentioned this issue May 4, 2020

connection plugin does not work with rootless containers containers/ansible-podman-collections#29

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ansible + podman not working #4813

ansible + podman not working #4813

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ansible + podman not working #4813

ansible + podman not working #4813

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