Ansible ad-hoc command on multiple hostsTuesday, 13 Nov 2018 14:33:20 · 1 minute read
ansible / ad-hoc / automation / · computing /
Quite often I want to run an ad-hoc command against a number of hosts, usually this is a subset of an existing group (and often new nodes added to a group).
Let’s say we had an inventory that looks like this:
[webhosts] web1 web2 web5 [jenjins] j1 j2 j3 mac-j2 mac-j3 wj1
We’ve just added
mac-j3, run some Playbook against them, but realised we wanted to reboot them after the Playbook for some reason.
Until today, I thought I had two choices:
- Put these two hosts into a separate, temporary, group.
- Run the ad-hoc command against each machine individually.
I would usually do the first when I had many hosts, amd the second if I had two or three.
Today I discovered a third choice (certainly works in ansible 2.7, may work in earlier versions):
- Using spaces, list machines within quotation marks.
So, we can do something like this:
ansible 'mac-j2 mac-j3' -i boxen -m reboot --become