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README.md

Workshop Exercise - Wrap up

Read this in other languages:
uk English, japan日本語, brazil Portugues do Brasil, france Française, Español Español.

Table of Contents

Objective

This is the final challenge where we try to put most of what you have learned together.

Guide

Let’s set the stage

Your operations and application development teams likes what they see in Ansible automation controller. To really use it in their environment, they put together these requirements:

  • All webservers (node1, node2 and node3) should go in one group.

  • As the webservers can be used for development purposes or in production, there has to be a way to flag them accordingly as "stage dev" or "stage prod".

    • Currently node1 and node3 are used as a development system and node2 is in production.

  • Of course the content of the world famous application "index.html" will be different between dev and prod stages.

    • There should be a title on the page stating the environment
    • There should be a content field

  • The content writer wweb should have access to a survey to change the content for dev and prod servers.

The Git Repository

All code is already in place - this is a automation controller lab after all. Check out the Workshop Project git repository at https://github.com/ansible/workshop-examples. There you will find the playbook webcontent.yml, which calls the role role_webcontent.

Compared to the previous Apache installation role there is a major difference: there are now two versions of an index.html template, and a task deploying the template file which has a variable as part of the source file name:

dev_index.html.j2

<body>
<h1>This is a development webserver, have fun!</h1>
{{ dev_content }}
</body>

prod_index.html.j2

<body>
<h1>This is a production webserver, take care!</h1>
{{ prod_content }}
</body>

main.yml

[...]
- name: Deploy index.html from template
  template:
    src: "{{ stage }}_index.html.j2"
    dest: /var/www/html/index.html
  notify: apache-restart

Prepare Inventory

Navigate to Automation Execution -> Infrastructure -> Inventories. Select 'Workshop Inventory' and complete the following:

  1. Go to the Groups tab, click Create group, and create a new group labeled Webserver. Click Create group.
  2. In the Webserver group, click Edit group and define the following variable:

Within the Variables textbox define a variable labeled stage with the value dev and click Save group.

stage: dev

Within the Details tab of the Webserver group, click the Hosts tab, click the Add existing host. Select node1, node2, node3 as the hosts to be part of the Webserver inventory.

Within Automation Execution -> Infrastructure -> Inventories, select the Workshop Inventory. Click on the Hosts tab and click on node2. Click on Edit host and add the stage: prod variable in the Variables window. This overrides the inventory variable due to order of operations of how the variables are accessed during playbook execution.

edit host

Within the Variables textbox define a variable labeled stage with the value of prod and click Save host.

stage: prod

Create the Template

Within Automation Execution -> Templates, select the Create template -> Create job template button and fill as follows:

Parameter Value
Name Create Web Content
Job Type Run
Inventory Workshop Inventory
Project Workshop Project
Playbook rhel/apache/webcontent.yml
Execution Environment Default execution environment
Credentials Workshop Credential | Machine
Variables dev_content: "default dev content"
prod_content: "default prod content"
Options Privilege Escalation

Click Create job template.

web_content_job_template

Run the template by clicking the Launch template button.

Check the Results

This time we use the power of Ansible to check the results: execute uri to get the web content from each node, orchestrated by an Ansible playbook labeled check_url.yml

Tip

We are using the ansible_host variable in the URL to access every node in the inventory group.

---
- name: Check URL results
  hosts: web

  tasks:
    - name: Check that you can connect (GET) to a page and it returns a status 200
      ansible.builtin.uri:
        url: "http://{{ ansible_host }}"
        return_content: yes
      register: content

    - ansible.builtin.debug:
       var: content.content
[student@ansible-1 ~]$ ansible-navigator run check_url.yml -m stdout

Snippet of output:

TASK [debug] *******************************************************************
ok: [node1] => {
    "content.content": "<body>\n<h1>This is a development webserver, have fun!</h1>\ndev wweb</body>\n"
}
ok: [node2] => {
    "content.content": "<body>\n<h1>This is a production webserver, take care!</h1>\nprod wweb</body>\n"
}
ok: [node3] => {
    "content.content": "<body>\n<h1>This is a development webserver, have fun!</h1>\ndev wweb</body>\n"
}

Add Survey

Add a Survey to the template to allow changing the variables dev_content and prod_content.

In the Template, click the Survey tab and click the Create survey question button.

Fill out the following information:

Parameter Value
Question What should the value of dev_content be?
Answer Variable Name dev_content
Answer Type Text
  • Click Create survey question

In the same fashion add a second Survey Question

Parameter Value
Question What should the value of prod_content be?
Answer Variable Name prod_content
Answer Type Text

  • Click Create survey question

  • Click the toggle Survey disabled to enable the Survey questions.

  • Add permissions to the team Web Content so the template Create Web Content can be executed by wweb.

  • Within the Automation Execution -> Templates, click Create Web Content select the User Access tab and Add roles to add the user wweb the ability to execute the template.

    • Select user(s) -> select the checkbox wweb, click Next.
    • Select roles to apply -> select the checkbox JobTemplate Execute and click Next.
    • Review -> click Finish.

  • Run the survey as user wweb

    • Logout of the user admin of your Ansible automation controller.
    • Login as wweb and go to Automation execution -> Templates and run the Create Web Content template.

Check the results again from your automation controller host. We will use the dedicated uri module within an Ansible playbook. As arguments it needs the actual URL and a flag to output the body in the results.

[student@ansible-1 ~]$ ansible-navigator run check_url.yml -m stdout

Solution

Warning

Solution Not Below

You have done all the required configuration steps in the lab already. If unsure, just refer back to the respective chapters.

The End

Congratulations, you finished your labs! We hope you enjoyed your first encounter with Ansible automation controller as much as we enjoyed creating the labs.

Navigation
Previous Exercise

Click here to return to the Ansible for Red Hat Enterprise Linux Workshop