exercise-0.md

Get familiar with the CircleCI

Step 1: Fork the example Github project

Before we start, you will need to fork this Github project. This will allow you to run a couple of CircleCI builds because everyone gets a free 25 hour trial.

Step 2: Get familiar with the CircleCI configuration

Checkout your fork and take a look at the CircleCI configuration file location at ./circleci/config.yml. The initial configuration consists of three jobs:

1. checkout: Checks out the sourcecode from Github
2. scala: Run the Scala unit tests
3. deploy: Deploys the application

Furthermore, the workflows section specifies that these three jobs need to be executed one after the other.

Step 3: Get familiar with the CircleCI UI

Push a minor change to the master branch in your forked repository. Now, CircleCI will run your workflow, let's take a look at the CircleCI UI:

1. Go to: https://circleci.com/dashboard
2. Login using your Github account
3. Select Projects menu item on the left in the main menu

4. Select the circleci repository in the Linux tab

5. Click on the Start building button.

6. Select the Workflows menu item on the left in the main menu
7. Select the master branch in the list of branches and wait for the list of workflows the appear on the right (this part of the UI is sometimes a bit slow)

5. Select the workflow on the top of the list. Now you will see a the status of your last workflow:

Click on one of the jobs to see the output of the individual steps.