sharerootfs - "WARNING: No root filesystem has been found."

piatho · 11. April 2023

Hi all,

I have stumbled on an error which seems to exists already for a while as i could find several artifacts online. Unfortunately no thread comes with a solution that also works for me.

I think the closest thread is this here in the proxmox forum: VM mit OMV erstellt wie den Ordnerm mit Dateien in einen LXC mounten

Issue:

I have a a proxmox host (newest release) and installed OMV (newest release) against the standard practice in an LXC following a couple for recommendations for performance reasons.

Installation and access to OMV works fine, however bringing the datapools to OMV does not work. I cannot create shares based on root file system (here mounted drives)

Storage concept:

ZFS pool named "NAS"
ZFS datasets eg. NAS/Dataset1, NAS/Dataset2 etc.
Datasets are bind-mounted to the LXC container by adjusting the configuration of the LXC container on the host ... /container-id/container-id.conf. (mp0:/mount/point/on/host,mp=/mount/point/on/lxc) That works as expected until here
OMV to use local filesystem (here /mount/point/on/lxc or in my case mnt/dataset1) to create shares on

My idea here is basically

to have the ZFS pool and the data access able for OMV and/or other containers plus the host without having a need to re-share from OVM
to reduce the overhead of having OMV creating its own file system on top of the already created zfs file system

Followed some tutorials, i have the following configuration:

LXC is privileged, nesting is on
OMV is installed via script for manual installations on top of debian 11
Plugin "sharerootfs" is assumed to be installed - however here things start to fail

What i have tried/observed:

The plugin seems to not get installed, neither via gui nor via apt package manager. The apt installations runs without any error message, the OMV gui at least reports back WARNING: No root filesystem has been found. before confirming with "finish".
However, i was looking for the configuration file "sharerootfs.inc" here /usr/share/openmediavault/engined/rpc/sharerootfs and elsewhere and cannot find it. Its seems the plugin simply not install.

Hope i have provided enough information to get some guidance get some help here.

PS: I mas open to alternatives. Alternatives to my understanding might be:

using remote plugin to use an NFS share to create OMV shares on. However it would require the host to have an NFS server running - not very clean
using a VM instead of a LXC (eventually accepting performance caveats) using bind mounts to containers?

Many thanks for your support here

Regards

Piatho

votdev · 11. April 2023

The message is logged when the plugin can not detect a root file system during the installation. You'll find the code here. The script is simply searching for the mount entry for / in the fstab file. If you find a solution to improve the detection please contribute it to the community, so they can participaty from that.

votdev · 11. April 2023

You can start investigating the issue by running salt-call --local --retcode-passthrough --no-color --out=json mount.fstab in the CLI. You may also post it here to get an overview of your system setup and to find out why the root file system is not detected.

piatho · 11. April 2023

Thanks votdev. I think that brings me one step further. Using bind-mounts in the proxmox container config are an alternative way of using fstab. fstab in the container is not maitained. Thus its clear that the code fails to find a file system

I am not an expert, but cant you use cat /proc/mounts or mount to find the mounts too?

Code

if ! omv-confdbadm exists --filter "{\"operator\":\"stringEquals\",\"arg0\":\"uuid\",\"arg1\":\"${uuid}\"}" \
        "conf.system.filesystem.mountpoint"; then
      mntent=$(mount | grep 'on / ' | awk '{print $1,$3,$5}' | sed 's/(.*)//g')
      if [ "${mntent}" != "" ]; then
        device=$(mount | grep 'on / ' | awk '{print $1}' | sed 's/[0-9]*//g')
        fstype=$(echo ${mntent} | awk '{print $2}')
        opts=$(echo ${mntent} | awk '{print $3}')
        dump=0
        pass=1
        object="<uuid>${uuid}</uuid>"
        object="${object}<fsname>${device}</fsname>"
        object="${object}<dir>/</dir>"
        object="${object}<type>${fstype}</type>"
        object="${object}<opts>${opts}</opts>"
        object="${object}<freq>${dump}</freq>"
        object="${object}<passno>${pass}</passno>"
        object="${object}<hidden>1</hidden>"
        omv_config_add_node_data "/config/system/fstab" "mntent" "${object}"
      else
        omv_warning "No root filesystem has been found."
      fi

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piatho · 11. April 2023

(edit 12/04/23 : have changed mounting by adding the filesystem type)

To test a few scenarios, i have tried multiple ways of providing information in fstab:

Scenario 1: FSTAB:

/mnt/Nextcloud /mnt/Data zfs defaults 0 1

This does not help, since although salt-call --local --retcode-passthrough --no-color --out=json mount.fstab gives a good lookin output

Code

{
 "local": {
 "/mnt/Data": {
 "device": "/mnt/Nextcloud",
 "fstype": "zfs",
 "opts": [
 "defaults"
 ],
 "dump": "0",
 "pass": "1"
 }
 }
}

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I checked with salt-call --local --retcode-passthrough --no-color \--out=json mount.fstab | \jq --compact-output '.[] | .["/"]'

which gives me a "null" output.Changing the FSTAB by adding

/mnt/Nextcloud / zfs defaults 0 1 does work a bit better, installation is not stopping at filesystem but stopping somewhere else:

Code

Traceback (most recent call last):
File "/usr/sbin/omv-confdbadm", line 76, in <module>
sys.exit(main())
File "/usr/sbin/omv-confdbadm", line 72, in main
return cmd_inst.execute(*sys.argv)
File "/usr/share/openmediavault/confdbadm/commands.d/exists.py", line 55, in execute
return 0 if db.exists(cmd_args.id, filter) else 1
File "/usr/lib/python3/dist-packages/openmediavault/config/database.py", line 166, in exists
query.execute()
File "/usr/lib/python3/dist-packages/openmediavault/config/database.py", line 705, in execute
self._response = self._elements_to_object(elements)
File "/usr/lib/python3/dist-packages/openmediavault/config/database.py", line 481, in _elements_to_object
obj.validate()
File "/usr/lib/python3/dist-packages/openmediavault/config/object.py", line 236, in validate
self.model.validate(self.get_dict())
File "/usr/lib/python3/dist-packages/openmediavault/config/datamodel.py", line 202, in validate
self.schema.validate(data)
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 175, in validate
self._validate_type(value, schema, name)
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 230, in _validate_type
raise last_exception
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 201, in _validate_type
self._validate_object(value, schema, name)
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 306, in _validate_object
self._check_properties(value, schema, name)
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 521, in _check_properties
self._validate_type(value[propk], propv, path)
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 230, in _validate_type
raise last_exception
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 210, in _validate_type
self._validate_string(value, schema, name)
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 286, in _validate_string
self._check_one_of(value, schema, name)
File "/usr/lib/python3/dist-packages/openmediavault/json/schema.py", line 570, in _check_one_of
raise SchemaValidationException(
openmediavault.json.schema.SchemaValidationException: fsname: Failed to match exactly one schema.
[ERROR ] An un-handled exception was caught by salt's global exception handler:
DeviceNotFoundByFileError: [Errno 2] No such file or directory: '/dev/dm-7'
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/pyudev/device/_device.py", line 225, in from_device_file
device_type = get_device_type(filename)
File "/usr/lib/python3/dist-packages/pyudev/_util.py", line 130, in get_device_type
mode = os.stat(filename).st_mode
FileNotFoundError: [Errno 2] No such file or directory: '/dev/dm-7'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/bin/salt-call", line 11, in <module>
load_entry_point('salt==3003', 'console_scripts', 'salt-call')()
File "/usr/lib/python3/dist-packages/salt/scripts.py", line 449, in salt_call
client.run()
File "/usr/lib/python3/dist-packages/salt/cli/call.py", line 58, in run
caller.run()
File "/usr/lib/python3/dist-packages/salt/cli/caller.py", line 112, in run
ret = self.call()
File "/usr/lib/python3/dist-packages/salt/cli/caller.py", line 219, in call
ret["return"] = self.minion.executors[fname](
File "/usr/lib/python3/dist-packages/salt/loader.py", line 1235, in __call__
return self.loader.run(run_func, *args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 2268, in run
return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 2283, in _run_as
return _func_or_method(*args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/executors/direct_call.py", line 12, in execute
return func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 1235, in __call__
return self.loader.run(run_func, *args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 2268, in run
return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 2283, in _run_as
return _func_or_method(*args, **kwargs)
File "/var/cache/salt/minion/extmods/modules/omv_utils.py", line 241, in get_root_filesystem
return fs.predictable_device_file
File "/usr/lib/python3/dist-packages/openmediavault/fs/__init__.py", line 193, in predictable_device_file
if self.has_device_file_by_uuid():
File "/usr/lib/python3/dist-packages/openmediavault/device/block.py", line 171, in has_device_file_by_uuid
return is_device_file_by_uuid(self.device_file_by_uuid)
File "/usr/lib/python3/dist-packages/openmediavault/device/block.py", line 186, in device_file_by_uuid
for device_link in self.device_links:
File "/usr/lib/python3/dist-packages/openmediavault/device/block.py", line 89, in device_links
device = pyudev.Devices.from_device_file(context, self.device_file)
File "/usr/lib/python3/dist-packages/pyudev/device/_device.py", line 228, in from_device_file
raise DeviceNotFoundByFileError(err)
pyudev._errors.DeviceNotFoundByFileError: [Errno 2] No such file or directory: '/dev/dm-7'
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/pyudev/device/_device.py", line 225, in from_device_file
device_type = get_device_type(filename)
File "/usr/lib/python3/dist-packages/pyudev/_util.py", line 130, in get_device_type
mode = os.stat(filename).st_mode
FileNotFoundError: [Errno 2] No such file or directory: '/dev/dm-7'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/bin/salt-call", line 11, in <module>
load_entry_point('salt==3003', 'console_scripts', 'salt-call')()
File "/usr/lib/python3/dist-packages/salt/scripts.py", line 449, in salt_call
client.run()
File "/usr/lib/python3/dist-packages/salt/cli/call.py", line 58, in run
caller.run()
File "/usr/lib/python3/dist-packages/salt/cli/caller.py", line 112, in run
ret = self.call()
File "/usr/lib/python3/dist-packages/salt/cli/caller.py", line 219, in call
ret["return"] = self.minion.executors[fname](
File "/usr/lib/python3/dist-packages/salt/loader.py", line 1235, in __call__
return self.loader.run(run_func, *args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 2268, in run
return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 2283, in _run_as
return _func_or_method(*args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/executors/direct_call.py", line 12, in execute
return func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 1235, in __call__
return self.loader.run(run_func, *args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 2268, in run
return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
File "/usr/lib/python3/dist-packages/salt/loader.py", line 2283, in _run_as
return _func_or_method(*args, **kwargs)
File "/var/cache/salt/minion/extmods/modules/omv_utils.py", line 241, in get_root_filesystem
return fs.predictable_device_file
File "/usr/lib/python3/dist-packages/openmediavault/fs/__init__.py", line 193, in predictable_device_file
if self.has_device_file_by_uuid():
File "/usr/lib/python3/dist-packages/openmediavault/device/block.py", line 171, in has_device_file_by_uuid
return is_device_file_by_uuid(self.device_file_by_uuid)
File "/usr/lib/python3/dist-packages/openmediavault/device/block.py", line 186, in device_file_by_uuid
for device_link in self.device_links:
File "/usr/lib/python3/dist-packages/openmediavault/device/block.py", line 89, in device_links
device = pyudev.Devices.from_device_file(context, self.device_file)
File "/usr/lib/python3/dist-packages/pyudev/device/_device.py", line 228, in from_device_file
raise DeviceNotFoundByFileError(err)
pyudev._errors.DeviceNotFoundByFileError: [Errno 2] No such file or directory: '/dev/dm-7'
Updating configuration ...
END OF LINE

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toxic0 · 10. Februar 2024

Did something came out of this?

I was looking into using PvE as my btrfs storage manager, and mount the files directly into several LXC to be able to use it there and was hoping to use lxc OMV to share the content over smb and nfs...

I do have OMV running on a debian11 LXC but not able to use /mnt/brtfsnvme as a shared folder it seems it always needs a filesystem...

chente · 10. Februar 2024

Zitat von toxic0

Did something came out of this?
I was looking into using PvE as my btrfs storage manager, and mount the files directly into several LXC to be able to use it there and was hoping to use lxc OMV to share the content over smb and nfs...
I do have OMV running on a debian11 LXC but not able to use /mnt/brtfsnvme as a shared folder it seems it always needs a filesystem...

OMV does not run correctly in an LXC container. You can search for information about this on the forum.

votdev · 10. Februar 2024

Please check the big warning message at the top of https://docs.openmediavault.or…e/installation/index.html

sharerootfs - "WARNING: No root filesystem has been found."

chente 11. April 2023

Jetzt mitmachen!

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