Document FS plugin behaviour in Docker environment

[pczhang]

Check the bug
Before filling this bug report, please search if a similar issue already exists.
In this case, just add a comment on this existing issue.

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Start Glances with the following options '...'
2. Press the key '....'
3. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Environement (please complete the following information)

• Operating System (lsb_release -a or OS name/version): To be completed with result of: lsb_release -a

• Glances & psutil versions: Glances version: 4.1.2
  Glances API version: 4
  PsUtil version: 6.0.0
  Log file: /tmp/glances-root.log

• How do you install Glances (Pypi package, script, package manager, source): docker

• Glances test: fs [OK] 0.00077s key=mnt_point
  [{'device_name': '/dev/nvme0n1p5',
  'free': 536221671424,
  'fs_type': 'ext4',
  'key': 'mnt_point',
  'mnt_point': '/etc/resolv.conf',
  'percent': 85.2,
  'size': 3821550878720,
  'used': 3091128528896}, ...]

Additional context
Add any other context about the problem here.

You can also pastebin:

• the Glances configuration file (https://glances.readthedocs.io/en/latest/config.html#location)
• the Glances log file (https://glances.readthedocs.io/en/latest/config.html#logging)

[pczhang]

api/4/fs returns the following:

[{"device_name":"/dev/nvme0n1p5","fs_type":"ext4","mnt_point":"/etc/resolv.conf","size":3821550878720,"used":3090866900992,"free":536483299328,"percent":85.2,"key":"mnt_point"},{"device_name":"/dev/nvme0n1p5","fs_type":"ext4","mnt_point":"/etc/hostname","size":3821550878720,"used":3090866900992,"free":536483299328,"percent":85.2,"key":"mnt_point"},{"device_name":"/dev/nvme0n1p5","fs_type":"ext4","mnt_point":"/etc/hosts","size":3821550878720,"used":3090866900992,"free":536483299328,"percent":85.2,"key":"mnt_point"}]

[RazCrimson]

@pczhang
Could you give us more info on you host system?

Also could i get the output of this?

python -c "import psutil; print(psutil.disk_partitions())"

Please replace python with python3 or whatever works for your system

[pczhang]

I installed it through docker. The host system is debian, which doesn't have python installed. I assume you want me to run the command inside the docker container.

sudo docker exec -ti bcc5a9f5161e /bin/sh
/app # python -c "import psutil; print(psutil.disk_partitions())"
[sdiskpart(device='/dev/nvme0n1p5', mountpoint='/etc/resolv.conf', fstype='ext4', opts='rw,relatime,errors=remount-ro'), sdiskpart(device='/dev/nvme0n1p5', mountpoint='/etc/hostname', fstype='ext4', opts='rw,relatime,errors=remount-ro'), sdiskpart(device='/dev/nvme0n1p5', mountpoint='/etc/hosts', fstype='ext4', opts='rw,relatime,errors=remount-ro')]

[pczhang]

same command run on the host system has no issue.

sdiskpart(device='/dev/nvme0n1p5', mountpoint='/', fstype='ext4', opts='rw,relatime,errors=remount-ro', maxfile=255, maxpath=4096)

[RazCrimson]

@pczhang

The current output that you have received is normal since docker automatically mounts those files in all containers.
Getting the exact same result as the host is not possible due to docker's layer of virtualization.

If you are just interested in the disk usage, you can go ahead and use one of those entries. They all represent the same disk values. They are not hidden by default as you are able to get host disk info through them.

If you want to hide them (or just a portion of them) you can edit config file's fs plugin section (example)

I'll go ahead and close the issue if you don't face any other problems.

Please fill the issue template completely next time as it would make investigating such cases faster.