DevOps Stack Exchange is a question and answer site for software engineers working on automated testing, continuous delivery, service integration and monitoring, and building SDLC infrastructure. It only takes a minute to sign up.
Sign up to join this community
How do I go through all hosts in an Ansible inventory in serial with an Ansible ad-hoc and reboot servers with a specified number of seconds in between each reboot?
I am looking for something similar to:
ansible -i inventory nodes -a "/sbin/reboot"
It should have a pause and run in serial.
@Argyle explained the --fork 1 trick to achieve a serial run.
I suggest you have a look at the reboot module that might be better suited than running a command directly.
A quick example that will reboot all your nodes one by one waiting for each to be fully booted before moving to the next one.
ansible -i inventory nodes --forks 1 -m reboot
Pass needed parameters to the module depending on your requirements with the -a option.
reboot module. I wasn't aware it waited until the machine came back online. Good to know!
I think this might be as easy as adding a sleep with the value of seconds you'd like to wait before rebooting. Also, since Ansible runs in parallel by default, we'll have to specify that we only want it to run as one process (what Ansible calls forks) instead of the default of 5. So, like this:
ansible -i inventory nodes -a "sleep 30 && /sbin/reboot" -f 1
