Michael's recommendation of putting multiple plays in a playbook worked
great for me.
I ran a test and saw that all variables carry over between plays, so that
if you do a lot of work to set up state, you don't lose that when you
switch to a new play in the middle of a playbook.
Here is an example showing the general layout:
---
- hosts: dog,cat,opossum
sudo: true
vars:
branch: "{{ NESTED.VARIABLE.BRANCH }}"
version: "{{ NESTED.VARIABLE.version }}"
pre_tasks:
- name: Display all variables/facts known for a host
debug: var=hostvars[inventory_hostname]
roles:
- { role: webserver, tags: [ animals, servers ] }
tasks:
- name: Complicated task
shell: /bin/omg
- name: Gather lots of data
set_fact:
dog_public_ips: "{% for host in groups.get("dog", []) %}{{
hostvars[host]["ec2_public_ip_address"] }} {% endfor %}"
cat_public_ips: "{% for host in groups.get("cat", []) %}{{
hostvars[host]["ec2_public_ip_address"] }} {% endfor %}"
opossum_public_ips: "{% for host in groups.get("opossum", []) %}{{
hostvars[host]["ec2_public_ip_address"] }} {% endfor %}"
- name: Display all variables/facts known for a host
debug: var=hostvars[inventory_hostname]
## Just run this section 2 hosts at a time to limit the number of servers
disrupted at any given time
- hosts: dog,cat,opossum
sudo: true
serial: 2
tasks:
- name: Display all variables/facts known for a host
debug: var=hostvars[inventory_hostname]
In this, facts like "dog_public_ips" are still available in the second
"serial" play.
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