Node Mount Points

Check Items

Check whether there are inaccessible mount points on the node.

Solution

Scenario: There are inaccessible mount points on the node.

If NFS (such as obsfs or SFS) is used by the node and the node is disconnected from the NFS server, the mount point would be inaccessible and all processes that access this mount point are in D state.

Create a script file, for example, /tmp/check_hang_mount.sh on the node. The content of the script file is as follows:

for mount_path in `cat /proc/self/mountinfo | awk '{print $5}' | grep -v netns`
do  
    timeout 10 sh -c "cd $mount_path"
    if [ $? == 124 ];then
        echo "$mount_path hang mount"
    fi
done

Run the saved script and check the output.

The mount points of the /root/foo and /root/bar folders are incorrect.
Run the following command to check the suspended mount points:
```
mount -n | grep /root/foo
```
When a mount point is suspended, it typically indicates that services are not using it anymore. After confirming that the mount point is no longer required, run the following command to unmount it and then re-execute the previously mentioned script:
```
umount -l -f localhost:/tmp/nfs
```
After the execution, perform the check again on the pre-upgrade check page.