salt-master errors in LXC container

[Mogaba]

Hello,

I'm trying to run Salt Master in an LXC container in Proxmox and I get the following errors when starting salt-master service. The service still starts despite the errors. Could someone explain what these errors mean?

Container: ALT Linux P10
Salt version: 3007.0

Starting The Salt Master Server...
Started The Salt Master Server.
[ERROR   ] Publish server binding pub to /var/run/salt/master/master_event_pub.ipc ssl=None
[ERROR   ] An un-handled exception from the multiprocessing process 'MWorker-0' was caught:
Traceback (most recent call last):
  File "/usr/lib/python3/site-packages/salt/utils/process.py", line 994, in wrapped_run_func
    return run_func()
  File "/usr/lib/python3/site-packages/salt/master.py", line 1308, in run
    self.clear_funcs = ClearFuncs(
  File "/usr/lib/python3/site-packages/salt/master.py", line 2156, in __init__
    self.mminion = salt.minion.MasterMinion(
  File "/usr/lib/python3/site-packages/salt/minion.py", line 989, in __init__
    self.opts = salt.config.mminion_config(
  File "/usr/lib/python3/site-packages/salt/config/__init__.py", line 2353, in mminion_config
    opts["grains"] = salt.loader.grains(opts)
  File "/usr/lib/python3/site-packages/salt/loader/__init__.py", line 1154, in grains
    ret = funcs[key]()
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 160, in __call__
    ret = self.loader.run(run_func, *args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 1233, in run
    return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 1248, in _run_as
    return _func_or_method(*args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/grains/core.py", line 2761, in os_data
    grains.update(_virtual(grains))
  File "/usr/lib/python3/site-packages/salt/grains/core.py", line 1115, in _virtual
    if "QEMU Virtual CPU" in fhr.read():
OSError: [Errno 22] Invalid argument
Process MWorker-0:
Traceback (most recent call last):
  File "/usr/lib64/python3.9/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/usr/lib/python3/site-packages/salt/utils/process.py", line 994, in wrapped_run_func
    return run_func()
  File "/usr/lib/python3/site-packages/salt/master.py", line 1308, in run
    self.clear_funcs = ClearFuncs(
  File "/usr/lib/python3/site-packages/salt/master.py", line 2156, in __init__
    self.mminion = salt.minion.MasterMinion(
  File "/usr/lib/python3/site-packages/salt/minion.py", line 989, in __init__
    self.opts = salt.config.mminion_config(
  File "/usr/lib/python3/site-packages/salt/config/__init__.py", line 2353, in mminion_config
    opts["grains"] = salt.loader.grains(opts)
  File "/usr/lib/python3/site-packages/salt/loader/__init__.py", line 1154, in grains
    ret = funcs[key]()
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 160, in __call__
    ret = self.loader.run(run_func, *args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 1233, in run
    return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 1248, in _run_as
    return _func_or_method(*args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/grains/core.py", line 2761, in os_data
    grains.update(_virtual(grains))
  File "/usr/lib/python3/site-packages/salt/grains/core.py", line 1115, in _virtual
    if "QEMU Virtual CPU" in fhr.read():
OSError: [Errno 22] Invalid argument
[ERROR   ] An un-handled exception from the multiprocessing process 'MWorker-2' was caught:
Traceback (most recent call last):
  File "/usr/lib/python3/site-packages/salt/utils/process.py", line 994, in wrapped_run_func
    return run_func()
  File "/usr/lib/python3/site-packages/salt/master.py", line 1308, in run
    self.clear_funcs = ClearFuncs(
  File "/usr/lib/python3/site-packages/salt/master.py", line 2156, in __init__
    self.mminion = salt.minion.MasterMinion(
  File "/usr/lib/python3/site-packages/salt/minion.py", line 989, in __init__
    self.opts = salt.config.mminion_config(
  File "/usr/lib/python3/site-packages/salt/config/__init__.py", line 2353, in mminion_config
    opts["grains"] = salt.loader.grains(opts)
  File "/usr/lib/python3/site-packages/salt/loader/__init__.py", line 1154, in grains
    ret = funcs[key]()
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 160, in __call__
    ret = self.loader.run(run_func, *args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 1233, in run
    return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 1248, in _run_as
    return _func_or_method(*args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/grains/core.py", line 2691, in os_data
    grains.update(_linux_cpudata())
  File "/usr/lib/python3/site-packages/salt/grains/core.py", line 201, in _linux_cpudata
    for line in _fp:
OSError: [Errno 22] Invalid argument
Process MWorker-2:
Traceback (most recent call last):
  File "/usr/lib64/python3.9/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/usr/lib/python3/site-packages/salt/utils/process.py", line 994, in wrapped_run_func
    return run_func()
  File "/usr/lib/python3/site-packages/salt/master.py", line 1308, in run
    self.clear_funcs = ClearFuncs(
  File "/usr/lib/python3/site-packages/salt/master.py", line 2156, in __init__
    self.mminion = salt.minion.MasterMinion(
  File "/usr/lib/python3/site-packages/salt/minion.py", line 989, in __init__
    self.opts = salt.config.mminion_config(
  File "/usr/lib/python3/site-packages/salt/config/__init__.py", line 2353, in mminion_config
    opts["grains"] = salt.loader.grains(opts)
  File "/usr/lib/python3/site-packages/salt/loader/__init__.py", line 1154, in grains
    ret = funcs[key]()
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 160, in __call__
    ret = self.loader.run(run_func, *args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 1233, in run
    return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/loader/lazy.py", line 1248, in _run_as
    return _func_or_method(*args, **kwargs)
  File "/usr/lib/python3/site-packages/salt/grains/core.py", line 2691, in os_data
    grains.update(_linux_cpudata())
  File "/usr/lib/python3/site-packages/salt/grains/core.py", line 201, in _linux_cpudata
    for line in _fp:
OSError: [Errno 22] Invalid argument

[dafyddj]

It looks like these are permission errors i.e. that Salt cannot read certain system files such as /proc/cpuinfo within your containers.

[bdrx312]

That's odd. Why does it get an error 22 when trying to read the file instead of an errno 13 permission denied PermissionError when calling open on the file?

[dafyddj]

Maybe not permission errors (I responded with haste) but some kind of problem reading or accessing those files.

[bdrx312]

The problem sounds similar to this https://stackoverflow.com/questions/58506448/docker-and-fcntl-oserror-errno-22-invalid-argument