config

2017-02-12

Builder Bob said that whanApp requires some special config for each environment so lets introduce a group variable file per environment

  ▾ inventory/
    ▾ dev/
      ▾ group_vars/
          WhanApp.yaml
        hosts
    ▾ prod/
      ▾ group_vars/
          WhanApp.yaml
        hosts
  ▸ roles/
  ▸ files/
  ▾ templates/
        whanApp.json.j2
  whanApp.yaml

the WhanApp.yaml file is a simple yaml file with 1 variable with the same name as the group we defined for the app

---
appUrl: https://dev.whanApp.com

for dev and

---
appUrl: https://whanApp.com

for prod

the whanApp.yaml playbook now looks like this

---
- hosts: nodejsHosts
  become: true
  roles:
    - nodejs

- hosts: WhanApp
  become: true
  tasks:
    <..snip..>

    - name: stamp out the config file
      template: src=whanApp.json.j2 dest=/opt/whanApp/whanApp.json

    - name: restart whanApp
      service: name=whanApp state=restarted

referring to devdocs.io for the details…

  • template is a [take some variables and stamp out a specific copy for this host] module
{
  "environment": "{{appUrl}}"
}

and the jinja2 template engine takes the variable from the inventory’s WhanApp.yaml file and places the value of appUrl into the json file

now with the GSD list complete, you hook up the playbook’s execution with bob’s ci server