dictionary subset based on inventory?

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1

have a little lxc playbook making reverse proxies from one container to the others. it reads from a dictionary of container definitions, and i only want it to proxy the containers acting as web servers, which are in the group “web” in the inventory. how can i do this? the reverse proxy runs nginx and the host forwards port 80 to it.

heres the containers file,

`
containers:
reverseproxy:
hostname: reverseproxy.lan
address: 192.168.114.10
forwards:

  • { transport: tcp, host: 80, container: 80 }
    web1:
    hostname: web1.lan
    address: 192.168.114.11
    web2:
    hostname: web2.lan
    address: 192.168.114.12

`

heres the inventory

`
[lxc]
lxctest

[containers]
reverseproxy ansible_ssh_host=192.168.114.10
web1 ansible_ssh_host=192.168.114.11
web2 ansible_ssh_host=192.168.114.12

[web]
web1
web2

`

and this calls the include that makes the pair of includes from the reverseproxy playbook

`

  • include: make_reverseproxy.yml
    vars:
    hostname: “{{ item.value.hostname }}”
    address: “{{ item.value.address }}”
    with_dict: “{{ containers }}”
    `

item.key is also the ansible hostname, so maybe some kind of “when item.key in group web?”

i realize i could just make a list, but i hate repeating.

2

theres a globally available ‘groups’ so, as usual, its easy once you know it.

`

  • include: make_reverseproxy.yml
    vars:
    hostname: “{{ item.value.hostname }}”
    address: “{{ item.value.address }}”
    with_dict: “{{ containers }}”
    when: item.key in groups[‘web’]

`