Adds a bind mount from host to /usr/share/stormond/ directory on pmon container

[assrinivasan]

Why I did it

This is a part of a larger commit that adds a storage monitoring daemon to SONiC. This commit is needed to that storagemon daemon can save FS stats JSON file to disk in the event of planned reboots and unintentional powercycles.

SONiC Storage Monitoring Daemon HLD

Also added psutil module to perform process and system monitoring operations pythonically.

Work item tracking

• Microsoft ADO (number only): 17468992

How I did it

• Added a rule to create the directory on the pmon container
• Added a rule to create a bind-mount

How to verify it

Flash a switch with image containing the changes.
Run:

root@str2-7050cx3-acs-13:~# docker inspect pmon

and verify the following parameters in the "mounts" section:

        "Mounts": [
            .
            .
            .
            {
                "Type": "bind",
                "Source": "/host/pmon/stormond",
                "Destination": "/usr/share/stormond",
                "Mode": "rw",
                "RW": true,
                "Propagation": "rprivate"
            },
            .
            .
            .
        ]

Additionally, you can run the following steps:

1. Navigate to /host/pmon/stormond directory on the host and create an empty file
2. Enter the pmon container and navigate to /usr/share/stormond
3. Verify that the file created in the host is seen here
4. Add text to this file
5. Exit the docker container
6. cat the file on the host and verify that the text you added is seen here

root@str2-7050cx3-acs-13:/host# cd pmon/
root@str2-7050cx3-acs-13:/host/pmon# ls
stormond
root@str2-7050cx3-acs-13:/host/pmon# cd stormond/
root@str2-7050cx3-acs-13:/host/pmon/stormond# touch ashwin.txt
root@str2-7050cx3-acs-13:/host/pmon/stormond# docker exec -it pmon bash
root@str2-7050cx3-acs-13:/# cd /usr/share/stormond/
root@str2-7050cx3-acs-13:/usr/share/stormond# ls
ashwin.txt
root@str2-7050cx3-acs-13:/usr/share/stormond# ls -al
total 8
drwxr-xr-x 2 root root 4096 Feb 19 04:06 .
drwxr-xr-x 3 root root 4096 Feb 19 02:04 ..
-rw-r--r-- 1 root root    0 Feb 19 04:06 ashwin.txt
root@str2-7050cx3-acs-13:/usr/share/stormond# echo "Bind mount successful?" > ashwin.txt
root@str2-7050cx3-acs-13:/usr/share/stormond# exit
exit
root@str2-7050cx3-acs-13:/host/pmon/stormond# cat ashwin.txt
Bind mount successful?
root@str2-7050cx3-acs-13:/host/pmon/stormond#

As a third test:

Run ls -alirth in both the /host/pmon/stormond dir on the host and /usr/share/stormond dir in the pmon container and verify that the inode numbers match.

root@str2-7050cx3-acs-13:/host/pmon/stormond# ls -alirth
total 12K
129546 drwxr-xr-x 3 root root 4.0K Feb 19 04:06 ..
129554 drwxr-xr-x 2 root root 4.0K Feb 19 04:06 .
129555 -rw-r--r-- 1 root root   23 Feb 19 04:07 ashwin.txt

root@str2-7050cx3-acs-13:/host/pmon/stormond# docker exec -it pmon bash
root@str2-7050cx3-acs-13:/# cd /usr/share/stormond/
root@str2-7050cx3-acs-13:/usr/share/stormond# ls -alirth
total 12K
 33618 drwxr-xr-x 3 root root 4.0K Feb 19 02:04 ..
129554 drwxr-xr-x 2 root root 4.0K Feb 19 04:06 .
129555 -rw-r--r-- 1 root root   23 Feb 19 04:07 ashwin.txt
root@str2-7050cx3-acs-13:/usr/share/stormond#

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305

Tested branch (Please provide the tested image version)

• custom master image

Description for the changelog

adds bind mount from /host/pmon/stormond on the host to /usr/share/stormond on the pmon container as part of the larger stormon daemon feature.

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[assrinivasan]

/azp run

[azure-pipelines]

Commenter does not have sufficient privileges for PR 18122 in repo sonic-net/sonic-buildimage

[prgeor]

@assrinivasan please point to the HLD in the PR descripton

[assrinivasan]

@assrinivasan please point to the HLD in the PR descripton

Done.

[prgeor]

@lguohan please help merge

[assrinivasan]

/azpw ms_conflict

[assrinivasan]

/azpw ms_conflict

[assrinivasan]

@saiarcot895 @prgeor I'm not sure why we are seeing an ms_conflict issue. I have verified that the three files I am changing here do not have any conflicts with the corresponding internal repo files.

[assrinivasan]

/azpw ms_conflict

[assrinivasan]

@lguohan all checks have now passed. Could you please help merge?
cc @prgeor