AWS CodeDeploy is a deployment service that automates application deployments to Amazon EC2 instances, on-premises instances, serverless Lambda functions, or Amazon ECS services.

What we are doing

Create IAM Role for AWS CodeDeploy

CodeDeploy needs Permission (IAM Role) to execute scripts and deploy your Application changes to EC2, or ECS, etc, we are creating for EC2 ,

because we are Creating a role for CodeDeploy which will deploy changes to EC2 That is why i am choosing first use case ,

Create AWS CodeDeploy Application, Deployment Group

Open console.aws.amazon.com/codesuite/codedeploy/

Create AWS CodeDeploy Deployment Group

When We create Deployment the Source (Revision, Changes ) of the Application can be in S3 Bucket or Github, Output of CodeBuild, CodePipeline (also stored in Github), etc.

For this demo, let's set up an S3 bucket as the source for CodeDeploy. Later on, we'll explore how to modify CodeDeploy to use the output from CodeBuild as the source.

Create A S3 Bucket for AWS CodeDeploy

Creating a Deployment Package for AWS CodeDeploy: Zipping "source" Directory with "index.html"

CodeDeploy needs a source (Revision, Changes ) in one of the following extensionstar,zip , tar.gz, tgz
I created a "source" directory, added an "index.html" file with the content "hello world," and then zipped the entire "source" directory into "source.zip."

and then upload source.zip in the newly created S3 bucket

Create a First Deployment in AWS CodeDeploy

Now go back to the Previous Tab and create a deployment

It may remain in a progress state for 5 to 10 minutes as we haven't configured the CodeDeploy agent on our EC2 instance.

CodeDeploy agent was not able to receive the lifecycle event. Check the CodeDeploy agent logs on your host and make sure the agent is running and can connect to the CodeDeploy server.

The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available for deployment, or some instances in your deployment group are experiencing problems.

Install CodeDeploy Agent in EC2 Ubuntu

you can follow https://docs.aws.amazon.com/codedeploy/latest/userguide/codedeploy-agent-operations-install-ubuntu.html

sudo apt update && sudo apt install ruby-full wget
cd /home/ubuntu
# CHANGE region code if your EC2 is not in us-east-1 ,  you can see in instance
# availibity zone 
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 status

After installing CodeDeploy you should have its status

Give codeDeploy Other Retry

InstanceAgent::Plugins::CodeDeployPlugin::CommandPoller: Missing credentials - please check if this instance was started with an IAM instance profile

Attach EC2 Instance Profile (IAM Role ) for CodeDeploy

We need to attach a role to our EC2 machine,

Note: It takes some time for the attached role changes to reflect in EC2.

Attach IAM Role to EC2

Select your EC2 instance and attach IAM Role you just reated

wait for some time, if you are waiting please make sure to restart the code Deploy Agent in your EC2

sudo service codedeploy-agent restart

Create Another Deployment after adding IAM Role to EC2

if we check the logs of codedeploy-agent

tail -f /var/log/aws/codedeploy-agent/codedeploy-agent.log

CodeDeploy can talk to EC2 and EC2 also has permission to download code from s3 , when deploying through CodeDeploy we need to configure three parameters

CodeDeploy Requirements

CodeDeploy requires this specification for a deployment:

1. Revision - Specifies what to deploy.

2. Deployment group - Specifies where to deploy.

3. Deployment configuration - how to deploy. (Using Appspec.yml)

What is Appspec.yml

An AppSpec file, in YAML format, guides AWS CodeDeploy on file copying and script execution. Placed in the revision root directory, it comprises two sections:

1. Files Section: Identifies source files for copying and their destination on each instance.

2. Hooks Section: Defines script locations (relative paths from the revision root) for execution during deployment lifecycle events.

Create Another Deployment With an IAM Role to EC2, Appspec in S3

Create a deployment package v2-source.zip containing an appspec.yml , ndex.html file with deployment instructions. Upload this package to an S3 bucket and initiate a new deployment with AWS CodeDeploy. Adjust the S3 URI and CodeDeploy application/deployment group.

version: 0.0
os: linux
files:
  - source: /
   # Destination in EC2
    destination: /home/ubuntu/myproject

Create Another New Deployment

Deployment lifecycle and hooks

Source https://aws.amazon.com/codedeploy/faqs/#:~:text=A%20deployment%20group%20is%20the,you%20target%20for%20a%20deployment.

You can learn more about the deployment lifecycle and hooks

https://aws.amazon.com/codedeploy/faqs/#:~:text=A%20deployment%20group%20is%20the,you%20target%20for%20a%20deployment.

Sources

Appspecfile https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file.html

https://docs.aws.amazon.com/codedeploy/latest/userguide/welcome.html

https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html#appspec-hooks-server
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