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I need help. I have Linux box (openSUSE 11.4); writing Perl script (Perl 5, version 12). My script should SSH to the remote Linux machine and get back with the memory results. So far, I have SSH working with DSA private key for passwordless connection. Now I'm stuck with getting memory.

I tried to use Filesys::DiskSpace module, but I have some trouble while installing this module. Guess it will not work.

Any help will be appreciated!

Thanks in advance!

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Get Munin or Monit. – Paul Tomblin Jun 28 '11 at 20:50
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2 Answers

up vote 4 down vote

Why bring perl into the mix? This is just a single-line deal:

$ ssh user@host free
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I need Perl script. It's a project requirement. My script should be sort of automatic that will run on every linux machine and get memory statistics. and memory is only first part of the project... :) – Maestro Jun 28 '11 at 20:18
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Ahh, so this is a homework question. Well then looks like it'll get closed. Homework questions are off-topic. – ErikA Jun 28 '11 at 20:19
it's not homework. I just want to automate my work rutine. – Maestro Jun 28 '11 at 20:22
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Why reinvent the wheel? There are dozens of open-source projects you can install that do this out of the box. Munin is one that I highly recommend. If you insist on a perl script, just make the above system call from within perl, storing the output in a variable. – ErikA Jun 28 '11 at 20:25
After searching the Internet, I realized that I cannot use Munin on the network we have here. However, it is really great software! Thanks! Because we cannot install Munin-node to other devices in the network (such as Solaris and Windows based servers). – Maestro Jun 29 '11 at 15:14
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up vote 0 down vote

Just execute cat /proc/meminfo on the target machine to retrieve all informations about the current memory usage you could get from the system.

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I was thinking about writing my script so that it will trigger a command on the other remote machine and get results back. But I have no idea how to write it. – Maestro Jun 28 '11 at 20:20
use Net::OpenSSH to execute commands on the remote side, and simply parse /proc/meminfo, thats the easiest way you could go. Use free is another way, but its harder to parse. (just a little bit) – Thomas Berger Jun 28 '11 at 20:23
thank very much, Mr. Berger. I will try to do this. – Maestro Jun 28 '11 at 20:29
I also have Solaris servers on the network, so I need other specific command to get free memory available on the remote machine. Any suggestions? Thanks in advance! – Maestro Jun 29 '11 at 15:19
@Maestro: check also Net::OpenSSH::Parallel – salva Jun 30 '11 at 9:00
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