Quentin, really useful post.
However I had to add two things in order to skip the errors on hosts that
were unreachable. I think this might be helpful in case they are not
started and you would like to start them later from the ec2 module.
Tried to suppress the stuff using configuration variables
host_key_checking=True
display_skipped_hosts=True
but that still getting the
PLAY
***************************************************************************
messages, which is really annoying.
It is going to be a good idea to include this playbook in the beginning so
other scripts can reuse the dynamic group(s).
- hosts: ec2
serial: 1
* gather_facts: false*
* ignore_errors: yes*
tasks:
- name: Add host(s) from EC2 tag group to Controller group
local_action: add_host
name={{inventory_hostname}}
groupname='Put_your_new_dynamic_group_name_here'
#when: item.startswith('tag_Name_') and item.endswith(
*your_name_variable*) and (inventory_hostname in groups[item]) #optional
loose matching
when: item == 'tag_Name_' + *your_name_variable* and
(inventory_hostname in groups[item])
with_items: group_names
On Tuesday, December 16, 2014 at 10:45:10 AM UTC-8, Quentin Stafford-Fraser
wrote:
>
> I spent a long time trying to get this to work, and eventually managed it,
> so just in case it's useful for anyone else...
>
> I wanted to tag my EC2 instances with, say 'webserver: True' and have them
> then appear in the 'webserver' host group locally, but I wanted to do it as
> a general case, without having to write special code for every group.
>
> The ec2.py inventory script will put each host into a group called 'ec2'
> and also, for example, into 'tag_webserver_True'.
>
> So this is what I did next:
>
> ---
> - hosts: ec2
> remote_user: ubuntu
> serial: 1
> tasks:
> - name: Add hosts in EC2 tag groups to local groups
> local_action: add_host
> name={{inventory_hostname}}
> groupname={{item[4:-5]}}
> when: item.startswith('tag_') and item.endswith('_True') and
> (inventory_hostname in groups[item])
> with_items: group_names
>
>
> It took me a couple of hours playing with all sorts of variations on this
> theme to realise that the *really important bit is to include 'serial:
> 1'. *
>
> Adding things to groups using add_host *does not work reliably* if there
> are multiple hosts being processed simultaneously. You will probably find
> that a single host gets added to the group but no more.
>
> This, however, seems to work fine, and can easily be included in playbooks
> where it will be ignored if you're not using any EC2 hosts.
>
> Hope that's useful for someone!
>
>
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