28 lines
957 B
Markdown
28 lines
957 B
Markdown
[[!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]]
|