check_disk_write.pl plugin

[simonl]

Hello,
Need a plugin that will make sure the root user can write to "/" and /usr.
We have situations where these filesystems go into read-only mode due to a vmware issue on the storage.

If I install that plugin will or can it be run as root to do the test I'm looking for which is touch /testfile touch /usr/testfile.

Thank you

[rkennedy]

Did you look at our Exchange ( https://exchange.nagios.org/ ) to see if any of those plugins would work for you?

[simonl]

should have been more specific.
the check_disk_write.pl reads like it will do what we want functionally.

My question is once I get check_disk_write.pl installed can it be run as root since only root can write to "/" and "/usr".
Is it as simple as have the script be owned as root with a suid permissions?

I'm asking this since I've haven't had the oppty. yet to download a plugin and have it installed in our nagios environment. I've been using cann'ed plugins from the red hat and epel repos.

[rkennedy]

Ah - I understand now. Yes, this should work fine.

You will need to tweak your /etc/sudoers file accordingly though, to make sure that the user can run the script for one, and with NOPASSWD for two.

Here's an example, before and after editing the sudoers -

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[nagios@suse11 nagios-plugins]$ sudo ./check_disk_write.pl -d /
[sudo] password for nagios:
Sorry, user nagios is not allowed to execute './check_disk_write.pl -d /' as root on suse11.nagios.local.

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[nagios@suse11 nagios-plugins]$ sudo ./check_disk_write.pl -d /
OK: canary file I/O written => read back 51 bytes successfully in /, unique contents verified

Also, this is a broad example of what I added to my sudoers file -

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nagios  ALL=(ALL)       NOPASSWD: ALL

[simonl]

moving fwd. The script is looking for libraries that I do not have:
./check_disk_write.pl -d /usr -v
Can't locate HariSekhonUtils.pm in @INC (@INC contains: ./lib /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8) at ./check_disk_write.pl line 23.



do you know is there a way to yum install these libraries?

[rkennedy]

These plugins use a custom library - seperate from Nagios, see https://github.com/harisekhon/nagios-plugins for instructions under the 'Quick Start' text for what you'll need to run.

[simonl]

next problem:
git clone https://github.com/harisekhon/nagios-plugins
Cloning into 'nagios-plugins'...
error: SSL certificate problem, verify that the CA cert is OK. Details:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed while accessing https://github.com/harisekhon/nagios-pl ... pload-pack
fatal: HTTP request failed

[rkennedy]

To disable the git SSL check use this following command -

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git config --global http.sslVerify false