On your journey of making a CI/CD pipeline on AWS with these tools, you completed AWS CodeCommit & CodeBuild.

Next few days you'll learn these tools/services:

CodeDeploy
CodePipeline
S3

What is CodeDeploy ?

AWS CodeDeploy is a deployment service that automates application deployments to Amazon EC2 instances, on-premises instances, serverless Lambda functions, or Amazon ECS services.
CodeDeploy can deploy application content that runs on a server and is stored in Amazon S3 buckets, GitHub repositories, or Bitbucket repositories. CodeDeploy can also deploy a serverless Lambda function. You do not need to make changes to your existing code before you can use CodeDeploy.

Task-01 :

Read about Appspec.yaml file for CodeDeploy.

The appspec.yml file is used by AWS CodeDeploy to manage and specify deployment actions. It defines the structure and the actions that CodeDeploy will execute during the deployment process.

Here is an example structure of an appspec.yml file:
```
  yaml
```
```
  version: 0.0
  os: linux
  files:
    - source: /
      destination: /var/www/html/
  hooks:
    BeforeInstall:
      - location: scripts/install_dependencies.sh
        timeout: 300
        runas: root
    AfterInstall:
      - location: scripts/start_server.sh
        timeout: 300
        runas: root
    ApplicationStart:
      - location: scripts/restart_server.sh
        timeout: 300
        runas: root
```
- version: Specifies the version of the appspec.yml file.
- os: Specifies the operating system (Linux or Windows).
- files: Lists the source files and their destination on the instance.
- hooks: Specifies lifecycle event hooks, which are scripts that run at different stages of the deployment.

Deploy index.html file on EC2 machine using nginx

To deploy nginx on an EC2 machine, you need to follow these steps:

Launch an Ubuntu instance for CodeDeploy.

Open your AWS Management Console and navigate to the CodeDeploy console, then click on Create Application.

In the Application Configuration, write your Application name as Day-52-Code-Deploy and in the compute platform, choose ec2/on-premises and click on Create application.

After that, open your IAM console and create a role called code-deploy-role for CodeDeploy. Attach policies to it AmazonEC2FullAccess, AmazonEC2RoleforAWSCodeDeploy, AmazonEC2RoleforAWSCodeDeployLimited, AmazonS3FullAccess, AWSCodeDeployFullAccess, AWSCodeDeployRole.

Now, come back to the CodeDeploy console and click on Create Deployment Group.

In the deployment group name, write the group name as code-deploy-group. In the service role, select your IAM role which you created just now. In Environment configuration, select Amazon EC2 instances. In the place of the key, select Name, and in the place of value, select the instance that you launched. In Agent Configuration with AWS Systems Manager, select Never and Disable the load balancer and click on Create Deployment Group and click on create deployment.

Now open your instance and connect to it with SSH on your local machine. Create a file called code-deploy-agent-installation.sh.

#!/bin/bash

sudo apt-get update
sudo apt-get install -y ruby wget
cd /tmp
wget https://aws-codedeploy-us-east-1.s3.us-east-1.amazonaws.com/latest/install
chmod +x ./install
sudo ./install auto
sudo service codedeploy-agent start
sudo service codedeploy-agent status
sudo systemctl enable codedeploy-agent

Now, come back to your local machine and enter the Day-51-NGINX folder. Create a file called appspec.yml. In the folder, create a folder named scripts, and in that folder, create a file for installing and starting the nginx script. Commit and push it to the CodeCommit repository.

vim appspec.yml

 version: 0.0
 os: linux

 files:
   - source: /
     destination: /var/www/html

 hooks:
   BeforeInstall:
     - location: scripts/install_dependencies.sh
       timeout: 300
       runas: root

   ApplicationStart:
     - location: scripts/start_server.sh
       timeout: 300
       runas: root

mkdir scripts && cd scripts

vim install_dependencies.sh

#!/bin/bash

sudo apt update
sudo apt install nginx -y

vim start_server.sh

#!/bin/bash

sudo systemctl start nginx
sudo systemctl enabale nginx

git add .
git commit -m "<message>"
git branch
git push origin "<branch-name>"

Now navigate to the CodeBuild console, click on your folder, and then click on Start Build. The status in the Phase Details should show success.

Once you go to your S3 bucket, check whether your appspec and scripts folders are there or not.

Now come back to the CodeCommit console, and in the artifacts section, in the name field, write .zip. In artifacts packaging, select zip and click on update project. Then click on start build and ensure it reaches a success state.

Now go to the S3 bucket and refresh. You will see the zip file of your folder.

After clicking on Create Deployment in deployment settings, choose "My application is stored in Amazon S3." Navigate to the S3 bucket, select your folder's zip file that you created just now, and click on "Copy S3 URI." Your zip file URI will be copied. Go back to the CodeDeploy console, in the Revision type, paste your zip file URI, keep the rest of the settings as default, and click on "Create deployment."

Now navigate to the EC2 instance, select your instance, at the top right click on "Action", go to "Security," and click on "Modify IAM role."

Now click on Create new IAM role and click on Create role. In the use case, select EC2 and click on Next. Select the policies such as AmazonEC2FullAccess, AmazonS3FullAccess, and AWSCodeDeployFullAccess, and click on Next. Write the role name as Ec2-code-deploy-role and click on Create role.

Now come back to modify the IAM role, refresh, and select the IAM role you created and update the IAM role.

Now go to your instance and restart your code agent, then click on retry deployment.

sudo service codedeploy-agent restart && sudo service codedeploy-agent status

Now copy your EC2 IP address and paste it into your web browser. Your server should run.

Happy Learning

Thanks For Reading! :)

-Sri Parthu💝💥

Day 52: Your CI/CD pipeline on AWS - Part 3 🚀 ☁

Table of contents

What is CodeDeploy ?

Task-01 :

Read about Appspec.yaml file for CodeDeploy.

Deploy index.html file on EC2 machine using nginx