Ansible ad-hoc command on multiple hosts

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-j2 and 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:

  1. Put these two hosts into a separate, temporary, group.
  2. 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 anisble 2.7, may work in earlier versions):

So, we can do something like this:

ansible 'mac-j2 mac-j3' -i boxen -m reboot --become

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