On Sunday, 12 November 2017 20.31.36 CET Jörg Kastning wrote:
> Am 12.11.2017 um 15:23 schrieb Kai Stian Olstad:
> >
> > Then you could use "register: status_snapshot" on this task, and check it's
> > status in the next play.
>
> Ok, I'll try that. Since one of the common return values of ansible
> modules is
> [failed](http://docs.ansible.com/ansible/latest/common_return_values.html#id5)
> I would like to use it in my play. But how could I use it? Do I simply
> have to use "register: failed" to check it in the next play?
When a task fails the default behavior is that the playbook will stop for that
host.
So even if you have several play in the playbook they will not run that host if
one of the task before has failed.
So you wouldn't need to do anything to avoid the second play to run as long as
the snapshot is on the same server as the Ansible code is going to run.
But lets say you have a database server(db-server) and an application
server(app-server).
Before upgrading the app-server a snapshot of the db-server need to be taken so
a rollback can be taken since the upgrade of app-server also changes the
database template.
In this kind of scenarios you'll need to do some checking.
But if you have disabled the holt on errors you can use this to check
- debug: msg="Will run if task failed"
when: status_snapshot.failed == true
>
> >> - hosts: staging
> >> tasks:
> >> - name: run yum -y update
> >> yum:
> >> name: "*"
> >> state: latest
> >
> > Variables in one play is available in subsequent play in the same playbook.
> > So you can then use the variable status_snapshot to decide what to do in
> > this play.
>
> Could you give an example how to evaluate the variable, please?
- hosts: vm1,vm2,vm3
tasks:
- name: Create random number from 1 to 2
command: shuf -i 1-2 -n 1
register: result
- hosts: vm1,vm2,vm3
tasks:
- debug: msg="{{ inventory_hostname}} found the correct number, the number
was 2"
when: result.stdout == "2"
This will run the command shuf on all vms, but in the second task in the other
play it will check the result of shuf.
If shuf has returned the number 2 then the debug task will run on only that
host, the other this task will be skipped.
--
Kai Stian Olstad
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