multiple async actions (background tasks) question

[Dmitry Makovey]

Hi, I'm trying to reconfigure a running OS to use bridge vs the actual interface. My playbook so far:

- name: copy bridge config

  template: src=if-br.j2 dest=/etc/sysconfig/network-scripts/if-{{ bridge_name }} backup=yes

- name: copy interface config

  template: src=if-nic.j2 dest=/etc/sysconfig/network-scripts/if-{{ nic_name }} backup=yes

# we will lose connectivity right after this

- name: add OVS port

  openvswitch_port: bridge={{ bridge_name }} port={{ nic_name }} state=present

  async: 60

  poll: 30

# we should recover connectivity right after this

- name: restart network 

  service: name=network state=restarted 

  async: 60

  poll: 30

As you can see last two actions should be run async (due to loss of connectivity) however they also need to be executed sequentially. I like the way those tasks are defined using Ansible (with some add-on built logic for checking whether bridge exists etc. that I don't have to implement) and would prefer it not to be a shell script instead. Are there any good options for doing it within ansible without resorting to "outsorcing" for that last chunk to a shell script?

[Michael DeHaan]

If you are polling on an async job, they will still be executed sequentially.

I do not see where you are calling a shell script in your example, so I can't tell what you mean by the last part of your question.  Can you elaborate or show that part?

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[Dmitry Makovey]

Sorry for being unclear - I meant that I can implement above functionality either via ansible (albeit I have no clue on how to make certain things run in the background as per my question) or write a script that does all of that and have a single ansible statement like this:

- shell: reconfigure_nic.sh {{ nic_name }} {{bridge_name}}

I'm leaving out details of that script implementation because I both don't have it and do not have inclination to implement it with all bells and whistles to match ansible functionality, but something along the lines of:

ovs-vsctl --may-exist add-port {{ bridge_name }} {{nic_name}}

service network restart 

and run it in the background...