3: CodeDeploy

What is it?

• Automates application deployments to various servers:
  • Ec2 instances
  • On-prem instances
  • Lambda functions
  • ECS services

What can you deploy?

• Code:
  • Java, C#, Lambda Funcs
  • Web and config files
  • Execs, pkgs, scripts
• Also multimedia files

Where do deployables come from?

• GitHub / BitBucket
• S3
• CodeCommit via S3

Where can we deploy to?

• Ec2 Placement Group
• Single ec2 instance
• Auto-scaling group
• Potentially cross-region

How to get set up?

• Have IAM user with CodeDeploy access (so you can use the service)
• Create IAM instance profile (so ec2 can fetch artifacts from S3)
• Create IAM service role(s) (so CodeDeploy can work with other AWS services like KMS)
  • Separate roles for lambda, ecs, ec2

What are revisions?

• The package type things we deploy in CodeDeploy

What’s the Deployment Configuration?

• Specifies how to deploy, and at what rate
  • Disaster recovery?
• Deployment method determines rate of deployment

What’s a Deployment Group?

• It’s where we deploy to.
• Could be a single instance or many
  • Could be one of many OS’es
• Could also be Lambda or ECS

How do we bring in some automation?

• EventBridge to monitor deployments
  • Create an SNS topic to subscribe to
  • Make a Lambda to do stuff with e.g. Slack

What is a CodeDeploy “application”?

• A name identifier used reference your deployment settings.

“Deployment Group”?

• Instance(s) where you want to target and deploy your code.
  • This could be even just one instance..!
  • Instance must have CodeDeploy agent installed in User Data

“Deployment Configuration”?

• Set of rules and success/fail conditions used during deploy
• May vary depending on deployment medium (e.g. on-prem vs. lambda)
• Might specify e.g. # of instances that must remain avail during deploy
  • “Minimum healthy host” value (can be %)

What’s the order of ops for deploy?

1. Create the “application”
2. Specify deployment group
3. Specify deploy config
   • With “Min healthy hosts”
4. Upload our “revision” (the pkg to deploy)
5. Deploy
6. Check results
7. Redeploy as needed

What are the Default Deployment Options?

• One at a time
• All at once
• Half at once

More details on deploy configs can be found here.