Re: How to build Debian Linux cluster?
On Thu, 7 May 1998, Alexander Kushnirenko wrote:
> > component in the cluster within 2 hours. I have since found out
> > listening to this list that the dpkg utility helps to make this
> > chore a lot simpler, if you learn to use the command line interface
> > (silly me).
>
> Could you please give more details about that. Imagine I need to
> update some package (perl for example) on 6 nodes simultaneously, what
> do I do?
i don't know if this has been answered yet or not, but try this:
1. have one of the machines mirror the debian archives, including the
non-US crypto-related stuff (secure shell - "ssh" - is essential).
set up /etc/exports so that all local machines can NFS mount them.
2. set up all machines so that they NFS mount the debian main archive as
/debian, and the debian non-US archive as /debian-non-US.
3. install ssh on all machines, and set them up to allow one machine to
have password-less root access to all of the others.
4. when you need to install/upgrade a package, write a little script like
this:
#! /bin/bash
# list of hosts to execute commands on
hosts='host1 host2 host3 host4 .....'
# command(s) to run. can be multiline command if needed
cmd='dpkg -iBE /debian/path/to/package.deb'
for i in $hosts ; do
ssh $i $cmd
done
if you need to do more complex things on each machine in turn, then
start by write a shell or perl script to do the job, then copy it to
each machine (using scp) and execute it on each machine. e.g. if you have
written a script called "fix-stuff.sh" which understands the command line
options "foo" and "bar", then a little wrapper script like the following
would copy it to all machines and execute it:
#! /bin/bash
# list of hosts to execute script on
hosts='host1 host2 host3 host4 .....'
for i in $hosts ; do
scp fix-stuff.sh $i:/tmp
ssh $i "/tmp/fix-stuff.sh foo bar"
done
these samples could easily be made generic so that they got $cmd or the
name of the script to copy&exec from the command line.
craig
--
craig sanders
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