Lab 10 - Solution¶

Mandatory¶

Split your inventory¶

Create two inventory files for test and prod
Use the same structure, but only use one web server
- Add web1.<firstname>.lab into prod
- Add web2.<firstname>.lab into test

# file: prod
[web]
web1.pascal.lab

[db]
db.pascal.lab

# file: test
[web]
web2.pascal.lab

[db]
db.pascal.lab

Run a ad-hoc command on the hostgroup web for both inventory files test and prod
Verify, if the task was executed on the right server

# run ping on the group web in the inventory test
ansible -m ping -i test web

# output
web2.pascal.lab | SUCCESS

# run ping on the group web in the inventory prod
ansible -m ping -i prod web

# output
web1.pascal.lab | SUCCESS

Set some variables¶

In your test inventory, create a parent group called test and add the group web and db
In your prod inventory, create a parent group called prod and add the group web and db

# file: test
[test:children]
web
db

# file: prod
[prod:children]
web
db

Create a variable envvar: test only for the test servers
Create a variable envvar: prod only for the prod servers

# file: group_vars/test.yml
---
envvar: test

# file: group_vars/prod.yml
---
envvar: prod

Create a playbook env.yml and create a task to debug the envvar variable
Run the playbook with both inventories

# file: env.yml
---
- hosts: all
  tasks:
    - name: debug envvar
      debug:
        msg: '{{ envvar }}'

# run env.yml on test
ansible-playbook -i test env.yml

# run env.yml on prod
ansible-playbook -i prod env.yml

Change the inventory in ansible.cfg¶

Make the test inventory to your default inventory

# file: ansible.cfg
[defaults]
inventory = test

Create a new role¶

Create a new role flask_app
Create a new group variable flask_app_version for test and prod
- value for prod -> v1.0
- value for test -> v1.1

# file: group_vars/test.yml
---
flask_app_version: v1.1

# file: group_vars/prod.yml
---
flask_app_version: v1.0

Create a role default variable for flask_app_version and set it to master

# file: flask_app/defaults/main.yml
---
flask_app_version: master

Create a task to checkout the git repo (see Git Module)
- https://github.com/pstauffer/flask-mysql-app.git
- checkout the version defined in the variable flask_app_version
- destination path should be /opt/flask_app

# file: roles/flask_app/tasks/main.yml
---
- name: checkout flask_app
  git:
    repo: https://github.com/pstauffer/flask-mysql-app.git
    dest: /opt/flask_app
    version: '{{ flask_app_version }}'

Create a new playbook deploy.yml
- run only on web hostgroup
- add the flask_app role

# file: deploy.yml
---
- hosts: web
  roles:
    - flask_app

Run the playbook on both inventories test and prod

# run on test
ansible-playbook -i test deploy.yml

# run on prod
ansible-playbook -i prod deploy.yml

Verify the checkout of the correct version -> Log on the servers, switch into the /opt/flask_app directory and run git describe --tags or git status

ssh web1.<firstname>.lab
cd /opt/flask_app
git describe --tags
v1.0

ssh web2.<firstname>.lab
cd /opt/flask_app
git describe --tags
v1.1

Commit your changes¶

add all files to your git repo and commit it

git status
git add roles/*
git commit -m 'lab 10'