Error: open /proc/sys/net/ipv4/ping_group_range with 0.43.0

[b1-luettje]

I'm not able to launch any container with port mapping since i upgraded to containers-common 0.43.0, downgrading to 0.42.1 fixes the problem.

$ podman info:

host:
  arch: amd64
  buildahVersion: 1.21.3
  cgroupControllers: []
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: /usr/bin/conmon is owned by conmon 1:2.0.29-1
    path: /usr/bin/conmon
    version: 'conmon version 2.0.29, commit: 7e6de6678f6ed8a18661e1d5721b81ccee293b9b'
  cpus: 8
  distribution:
    distribution: arch
    version: unknown
  eventLogger: journald
  hostname: ...
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 60458
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 60458
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
  kernel: 5.13.9-zen1-1-zen
  linkmode: dynamic
  memFree: 7743725568
  memTotal: 16420229120
  ociRuntime:
    name: crun
    package: /usr/bin/crun is owned by crun 0.21-1
    path: /usr/bin/crun
    version: |-
      crun version 0.21
      commit: c4c3cdf2ce408ed44a9e027c618473e6485c635b
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  os: linux
  remoteSocket:
    exists: true
    path: /run/user/.../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: /etc/containers/seccomp.json
    selinuxEnabled: false
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: /usr/bin/slirp4netns is owned by slirp4netns 1.1.12-1
    version: |-
      slirp4netns version 1.1.12
      commit: 7a104a101aa3278a2152351a082a6df71f57c9a3
      libslirp: 4.6.1
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.1
  swapFree: 1641017344
  swapTotal: 1641017344
  uptime: 15m 45.77s
registries:
  search:
  - docker.io
store:
  configFile: /home/luettje/.config/containers/storage.conf
  containerStore:
    number: 2
    paused: 0
    running: 0
    stopped: 2
  graphDriverName: btrfs
  graphOptions: {}
  graphRoot: /home/luettje/.local/share/containers/storage
  graphStatus:
    Build Version: 'Btrfs v5.13 '
    Library Version: "102"
  imageStore:
    number: 7
  runRoot: /run/user/60458/containers
  volumePath: /home/luettje/.local/share/containers/storage/volumes
version:
  APIVersion: 3.2.3
  Built: 1628285759
  BuiltTime: Fri Aug  6 23:35:59 2021
  GitCommit: 1e6fd46e91b21342f9454cf8105a92b90e398c52
  GoVersion: go1.16.7
  OsArch: linux/amd64
  Version: 3.2.3

With current version:

$ sudo podman run -it --rm -p 8080:8080 alpine
Error: open /proc/sys/net/ipv4/ping_group_range : No such file or directory: OCI runtime attempted to invoke a command that was not found

After downgrading to 0.42.1 everything is fine:

$ sudo podman run -it --rm -p 8080:8080 alpine
/ #

$ pacman -Qi containers-common
Name            : containers-common
Version         : 0.42.1-2
Description     : Configuration files and manpages for containers
Architecture    : any
URL             : https://github.com/containers
Licenses        : Apache
Groups          : None
Provides        : None
Depends On      : None
Optional Deps   : None
Required By     : podman  skopeo
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 143,35 KiB
Packager        : David Runge <[email protected]>
Build Date      : So 08 Aug 2021 22:56:33 CEST
Install Date    : Do 12 Aug 2021 08:40:23 CEST
Install Reason  : Installed as a dependency for another package
Install Script  : No
Validated By    : Signature

[b1-luettje]

/etc/containers/containers.conf is identical to /usr/share/containers/containers.conf

[DDoSolitary]

The errors seems to be caused by 62d90f9, which adds spaces around = in the default_sysctls config. The spaces are not striped but made its way to the final openat call and result in the ENOENT error.

Relevant part of strace log:

openat(AT_FDCWD, "/proc/sys", O_RDONLY|O_DIRECTORY) = 8
openat(8, "net/ipv4/ping_group_range ", O_WRONLY) = -1 ENOENT (No such file or directory)

[b1-luettje]

Correct, once i remove the spaces there are no problems anymore with the current version 👍

[unknowndevQwQ]

I just tested and found that crun and runc do not support sysctl options like net.ipv4.ping_group_range = 0 0, only youki does. But when I enable the ulimit "nofile = 1280:2560" option, I find that podman outputs level=error msg="validating containers config: unrecognized ulimit nofile = 1280:2560: invalid ulimit type: nofile "

Perhaps adding spaces to the equals sign of the sysctl/ulimit option is not what most people expect

[rhatdan]

No one should be shipping /etc/containers/containers.conf by default...

[xatier]

Well, archlinux does... 😂

https://github.com/archlinux/svntogit-community/blob/packages/containers-common/trunk/PKGBUILD#L96

[xatier]

@rhatdan , I added checks for extra spacing in ValidateSysctls, please take a look at containers/podman#11224 .