How can you check LINUX disk permissions?

It's a component, not a template. So you'd want to go to Settings > SAM Settings > Create New Template. Add a new component and choose Linux/Unix Script from the list. In the script you have to have a numeric statistic (even if you're not using it) and an exit code (0 = Up, 1 = Down).

Change the command to ${SCRIPT} so it just runs the body of the script instead of trying to pass it to perl (default).

#!/bin/sh# go ahead and echo the statistic - we're not actually using it this timeecho "Statistic: 0"# try to write the file/bin/touch /path/to/share/newfile-$$ >/dev/null 2>&1# test the resultif [ $? -ne 0 ]then    exit 1  # take it downelse    # clean up, it worked    rm /path/to/share/newfile-$$fi# if we got this far we were upexit 0

Update: I had the echo in between the touch and the exit status check which would have made it always pass. Fixed!

Steven W. Klassen

Programmer Analyst @ Loop1 Systems

http://www.loop1systems.com/

All comments

There's some magic you could do with SNMP EXEC and UnDP we can talk about if you only have NPM, but do you happen to have SAM? That'd be a much more direct approach with a Linux/Unix Script monitor to detect/remediate the issue.

Steven W. Klassen

Programmer Analyst @ Loop1 Systems

cjfranca

if you have SAM, use the linux template monitor.

FormerMember

I went to SAM templates and searched them for "Linux" . I don't see one named "linux template monitor" or "linux script monitor" in the Thwack templates or in the community ones, Do I need to go to another site to download and install them?

A bit more info on the issue , ls -l will not show that the volume is read only. The test is to write a file ( a touch command works ) and see if it fails. That would be the alert trigger condition.

Change the command to ${SCRIPT} so it just runs the body of the script instead of trying to pass it to perl (default).

#!/bin/sh# go ahead and echo the statistic - we're not actually using it this timeecho "Statistic: 0"# try to write the file/bin/touch /path/to/share/newfile-$$ >/dev/null 2>&1# test the resultif [ $? -ne 0 ]then    exit 1  # take it downelse    # clean up, it worked    rm /path/to/share/newfile-$$fi# if we got this far we were upexit 0

Update: I had the echo in between the touch and the exit status check which would have made it always pass. Fixed!

Steven W. Klassen

Programmer Analyst @ Loop1 Systems

Once the template has been created and is applied to the node then your blanket "Alert Me When a Component is Down" alert should catch it. If you want to actually remediate the issue you could do it in the script that runs the check but I'd then adjust the template to run less frequently than the default 300s (5 minutes) to avoid an overlap.

Steven W. Klassen

Programmer Analyst @ Loop1 Systems

FormerMember

This is really helpful, but how do to tell it that exit code 0 is "good" and exit code != 0 is "bad" ? or does it default to those values?The template had a help file link . I read the help file and it did not discuss the exit code of the script.

https://support.solarwinds.com/@api/deki/files/9907/SAMAdminGuide.pdf

Check out page 332 of the SAM Administrator guide below!

Steven W. Klassen

Programmer Analyst @ Loop1 Systems

Sorry, did you mean the SAM exit code or the exit code for the touch command? If it's the latter it's just a genera Linux/Unix truism (I think). 0 means success and non-zero (this number can vary depending who wrote the program) means something other than success.

[sklassen@L1HDSandbox ~]$ ls /etc/passwd/etc/passwd[sklassen@L1HDSandbox ~]$ echo $?0[sklassen@L1HDSandbox ~]$ ls myfacels: cannot access myface: No such file or directory[sklassen@L1HDSandbox ~]$ echo $?2[sklassen@L1HDSandbox ~]$ touch goodfilehere[sklassen@L1HDSandbox ~]$ echo $?0[sklassen@L1HDSandbox ~]$ touch /somefiletouch: cannot touch `/somefile': Permission denied[sklassen@L1HDSandbox ~]$ echo $?1

So in this case ls returns an exit status of 2 for file not found and touch returns 1 for a permissions failure. The man page for the utility (or its source - most utilities have their source available) can tell you all the different potential codes.

Steven W. Klassen

Programmer Analyst @ Loop1 Systems