www.nico.schottelius.org/blog/how-to-find-and-execute-stuff-on-all-hosts.mdwn

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[[!meta title="How to find and execute stuff on all hosts?"]]
## Motivation
Assume that you are managing a pretty large infrastructure of hosts,
sometimes there is a need to execute a command on all of them.
The big question is, where to find out, which hosts exist.
## Solution
The usual approach is to invent some kind of centralised daemon that collects
or searches for available hosts. There is a way simpler solution available in
my situation, which may help you as well:
We do have a monitoring infrastructure, to which all hosts transmit their
configuration. The configuration is stored containing the full hostname
(like **foo.bar.local.ch**) plus the .cfg suffix.
Thus a script that can be used to execute something on all hosts (sequentially though)
can look like this:
for host in $(ssh monitoring01 "cd /opt/icinga/etc/hosts.d; ls"); do
host=${host%.cfg}
ssh "root@$host" "$@"
done
[[!tag sysadmin localch unix]]