Looping until a condition is met
Looping in ansible is very powerful. If you combine looping with the until conditional you can create usefull playbooks. In this section we will look at some examples of how to use looping with until.
ignore_errors is a very useful option to use with until. It will ignore any errors that occur during the loop. This is very useful if you want to wait for a service to come online. If the service is not yet online the loop will fail. If you use ignore_errors the loop will continue until the condition is met.
Continue if website is online
Wait for a website to come online and continue only then.
- shell:
cmd: curl --connection-timeout 2 http://localhost
register: result
until: result is succeeded
retries: 10
delay: 30
ignore_errors: true
Configure a windows domain controller
If you configure a windows domain controller after the first reboot the connection might already be established, but the domain services are not yet ready. We want to only continue when the domain services are ready.
#Wait for DC to be back after promotion
- name: Wait for domain controller to be ready
win_shell: |
Get-ADDomain mydomain.com
register: dc_ready
until: dc_ready is not failed
ignore_errors: yes
retries: 180
delay: 5