run_once and serial

[Michael Peters]

I'm testing out the new run_once feature and overall it's working
great. But I then tried it in an upgrade playbook using serial. The
task is no longer run just once per-play, it's run once
per-host-group. So for a serial of 2 in a target group of 10 servers
it's run once per pair, so 5 times.

This seems like a bug to me, but I just wanted to make sure before I
filed a ticket on it.

[James Cammarata]

Yeah go ahead and open an issue for this, as it should only run once no matter what.

Thanks!

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[Michael DeHaan]

It will probably just be easiest to make it an error to use run_once with serial, because I don't want to have to pass a parameter to runner like "run_once_has_ran" and keep an internal hash for this.

In your case, solve the problem by having another play for the "run_once" steps outside of the host loop, that just affects localhost (or groupname[0])

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[Imran Khan]

I think the feature should be available because sometimes you need to run a task once, and then run the the playbook again, executing it by using some new result(s) ( such as content read from a file on a remote server) 

[Michael DeHaan]

"I think the feature should be available because sometimes you need to run a task once, and then run the the playbook again, executing it by using some new result(s) ( such as content read from a file on a remote server) "

run_once with serial now runs things once per serial batch.

If you need to run something *exactly* once, you can put it in a seperate play above or below the play in the current playbook, and just target that host.

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