---------- Forwarded message ----------
From: Andrew Mather <mathera@xxxxxxxxx>
Date: Mar 14, 2006 11:19 AM
Subject: Re: fedora-list Digest, Vol 25, Issue 127
To: fedora-list@xxxxxxxxxx, maccy@xxxxxxxxxxxxxx
Does anyone have a simple perl or shell script that will run a set of commands
on a number of machines?
For example install a perl cpan module on 50 machines, listed in a file.
What you're asking is not a trivial thing to do in a robust and reliable way !
This is the sort of thing you need to do if you're managing a cluster for example.
For my cluster, I use pdsh, which is a public-domain version of the dsh utility that IBM ship with their CSM suite. I've aliased it to dsh, because I was used to that ;-)
You can get it from here: http://www.llnl.gov/linux/pdsh/
You'll also need the genders library to define groups of machines (eg all FC4 machines, all FC5 machines). You can get that from here: http://www.llnl.gov/linux/genders/
This will all take a bit of setting up, however once it's up and working, it's a VERY powerful way to manage a heap of machines from a single node.
Once it's working, you can issue a command like: pdsh -a rpm -i somerpm.rpm This will install somerpm.rpm on all machines, or: pdsh -g fc4 shutdown -r now which would reboot all the machines in the fc4 group.
It also comes with a very handy utility called dshbak. With this, you can run a command on any number of machines and it will collate the output, grouping all identical outputs into one and listing the machines.
For example, pdsh -a `date` |dshbak -c would group together all machines which return identical times.
Other than that, you'd have to set up passwordless login for ssh on every node, list them all in a file and then use something like
for node in `cat mynodes.txt`
do
ssh -c $node do_something
done
This would (probably) work, but it would be pretty fragile.
HTH
This is the sort of thing you need to do if you're managing a cluster for example.
For my cluster, I use pdsh, which is a public-domain version of the dsh utility that IBM ship with their CSM suite. I've aliased it to dsh, because I was used to that ;-)
You can get it from here: http://www.llnl.gov/linux/pdsh/
You'll also need the genders library to define groups of machines (eg all FC4 machines, all FC5 machines). You can get that from here: http://www.llnl.gov/linux/genders/
This will all take a bit of setting up, however once it's up and working, it's a VERY powerful way to manage a heap of machines from a single node.
Once it's working, you can issue a command like: pdsh -a rpm -i somerpm.rpm This will install somerpm.rpm on all machines, or: pdsh -g fc4 shutdown -r now which would reboot all the machines in the fc4 group.
It also comes with a very handy utility called dshbak. With this, you can run a command on any number of machines and it will collate the output, grouping all identical outputs into one and listing the machines.
For example, pdsh -a `date` |dshbak -c would group together all machines which return identical times.
Other than that, you'd have to set up passwordless login for ssh on every node, list them all in a file and then use something like
for node in `cat mynodes.txt`
do
ssh -c $node do_something
done
This would (probably) work, but it would be pretty fragile.
HTH
