Pipelines for Applications

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In tutorial, we will walk through the steps to automatically build and deploy a Django application with Pipelines.

Django is a Python framework that lets you create web applications easily. For information on Django, visit the Django project website.

Before You Begin

Ensure you have the following:

1. Forking the Sample App from GitHub

If you already have a Django application, create a GitHub repository for your application, and add your code to your repository. Then, skip to Step 2 of this tutorial.

If you are using the sample Django application, do the following:

  1. Log into your GitHub account.
  2. Open the sample Django application in the GitHub repository.
  3. Click Fork. The Example-Django-App repository is copied to your GitHub account. Git Fork
  4. In your terminal, navigate to a directory where you want to store the code for the application. Then, clone the repository using the following syntax:

~~~ git clone https://github.com/YOUR_GITHUB_USERNAME/nodejsbuilddeploy.git ~~~

Next, we will link the GitHub repository to Pipelines. After it is linked, your application is automatically built every time you make changes to the application.

2. Creating the Application in Pipelines

  1. Log into your Pipelines account. The home page for your account opens.
  2. On the top right, click New App. The New App page opens.
  3. In the Name your app field, type a name for your app.
  4. Click GitHub. You are prompted to allow Pipelines to access your GitHub repositories. After you grant access, the New App page opens.
  5. Click Use GitHub. A list of your GitHub repositories is shown.
  6. Select the Example-Django-App repository that you forked in the earlier step. The list of branches for the repository is shown.
  7. Select the master branch, and click I’m Done. The Configure your Build Steps section expands.
  8. Build Steps are instructions that describe how to build and package your application. For this tutorial, in the PkgInclude section, add an asterisk (*). This includes all the application’s files in the build.
  9. Click Done. A summary of your build configuration is shown.
  10. From the Build Image menu, select Distelli Python (Docker), and click Start Build. The application is added to your account, and the build begins. To see the status of the build, click Go to Build.

Now that the application is added to Pipelines, we can deploy it to your EC2 instance.

3. Adding your Deployment Steps

  1. In your Pipelines account, in the top menu, click Applications. The list of your applications opens.
  2. Click the name of your application. The application’s settings page opens. Distelli Application Button
  3. Click the Manifest tab, and expand the Deployment Manifest section. In this section, we provide the commands that your server runs when the application is deployed.
  4. In the PreInstall section, add the commands to install Python and Django on the server: ~~~ sudo apt-get update sudo apt-get install python-pip sudo pip install django ~~~
  5. In the Exec section, add the command to start the application: ~~~ python manager.py runserver 0.0.0.0:8080 ~~~

In the next step, we add an environment for your application, and launch an EC2 instance to deploy the application to.

4. Adding your EC2 Instance

If you have set up an Amazon EC2 account, you can launch a new EC2 instance for your application from within Pipelines.

If you have not set up your Amazon EC2 account, see How to Set Up Amazon EC2 for steps to set one up.

  1. In your Pipelines account, from the top menu, click Applications. The list of your applications opens.
  2. Click the name of your application. The application’s settings page opens.
  3. Click the Environments tab, then click Create Environment, as in the example below: Adding an Environment
  4. In the top menu, click Servers. The Servers page opens.
  5. Click Add Server. The New Server page opens.
  6. Click Launch an EC2 instance. Follow the steps to choose your options:
    • Configuration Type: Select New EC2 Configuration.
    • AWS Region: Select a region that’s closest to you.
    • Instance Type: For this tutorial, select a General Purpose instance that works for you.
    • OS Image: Select Ubuntu.

    Depending on your EC2 configuration, select additional options, such as your Virtual Private Cloud (VPC), EC2 key pairs, and so on.

  7. In the Add Tags, User Data and Environments section, select the environment that you just created.
  8. When you have finished selecting your EC2 configuration, click Launch to start the instance.

In the next step, we will deploy the application to your server.

5. Deploying the Application

Every time your application is built, Pipelines creates a release. When you are ready to deploy the application, you select a release that is deployed to your server. To deploy the application:

  1. From the top menu, click Applications. The list of your applications opens.
  2. Click the name of your application. The application’s settings page opens.
  3. Click New Deployment (the “rocket” icon). The New Deployment page opens.
  4. Click Deploy a Release. You are prompted to choose your application.
  5. Click your application’s name, and select the latest release.
  6. When prompted to select an environment, select the environment you created in the previous step, and click All Done.
  7. Click Deploy. Your application is deployed.
  8. To test the application, navigate to http://<SERVER-IP-ADDRESS>:8080, where <SERVER-IP-ADDRESS> is the IP address of your EC2 instance.

6. Enabling Automatic Builds and Deployments

To enable automatic deployments for your application, you create an application pipeline to ensure that all successful builds are automatically deployed to your servers.

  1. From the top menu, click Applications. The list of your applications opens.
  2. Click the name of your application. The application’s settings page opens.
  3. On the right, under App Pipeline, ensure that the Auto Build option is enabled.
  4. To add a step to the pipeline, click Add Step, and select the environment you created earlier.
  5. Click Add. The environment is added to the pipeline.
  6. To enable automatic deployments, enable the Auto Deploy check box, and from the menu, select If the Build Succeeds. Distelli Branch Settings

7. Testing Automatic Deployments

Now, every time you push new code to your GitHub repository, Pipelines builds your application and deploys it to your server. Let’s make a small code change, and push it to the repository to observe this automation process in action.

  1. On your development machine, navigate to the folder where you added the sample application, and from the templates folder, open index.html in a text editor.
  2. Change some text in the HTML file, and save the file.
  3. In your terminal, push the code to your GitHub repository, using the following commands: ~~~ git add . git commit -m “Testing Distelli auto build” git push ~~~
  4. Your changed application is automatically built and deployed.

Now, when you navigate to http://<SERVER-IP-ADDRESS>:8080, you can see your changes.

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