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

---

• make an inventory
• install nodejs
• deploy the app
• configure the app

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