CodeDeploy

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CodeDeploy Icon

About

• A deployment service that automates application deployment.

• This service can automatically initiate rollback in case of failed deployments or trigger CloudWatch Alarm.

• appsec.yml file defines how deployments happens.

• Provides gradual control on deployments.

CodeDeploy Agent

• The agent is responsible to deploy artifacts onto servers like EC2 instances.

• As a prerequisite this agent should be installed in EC2 instance.

• The EC2 instance must have sufficient permissions to access S3 to get deployment bundles.

Deployment Group

• Deployment Group allows to group deployments settings in one place.
• It consists of multiple deployments.

Rollbacks and Redeploys

• Rollback is a redeploy a previously deployed revision of your application.

• This can be done automatically i.e., when a failure occurs based on some CloudWatch Alarm or Manually.

• Disable rollbacks - Do not perform rollbacks for this deployment.

• When rollback is performed, CodeDeploy performs a new deployment with last known good revision i.e., its not a restored version.

appSec.yml

• This YAML file consists of all the deployment instruction needed to deploy the application using CodeDeploy.
• This file should be present in the root of project.

• Life cycle hooks based on type of deployment can be configured in this file.
• This life cycle hooks provides a way to verify deployment after each deployment phase.

Integrations

EC2/On-premises platform

• CodeDeploy allows to deploy to EC2 instances & on-premises servers.

• It allows to perform in-place deployments (for EC2 instances or ASG deployments) or blue-green deployments (for ASG deployments, must be using an ELB).

• This requires CodeDeploy Agent to run on target instances.

• Deployment speed could be defined.

  Deployment Strategy	Description
  AllAtOnce	Will have most downtime
  HalfAtATime	Reduces capacity by 50% and does in-place deployments
  OneAtATime	Slowest, lowest availability impact
  Custom	Define your own rate of deployment

Lambda Platform

• CodeDeploy helps to automate traffic shifts for Lambda aliases.

• Feature is integrated with SAM framework.
• This traffic shift can be done using different strategies.

  Strategy Type	Strategy Names	Description
  Linear	LambdaLinear10PercentEvery3Minutes LambdaLinear10PercentEvery10Minutes	Grow traffic every N minutes untill 100%
  Canary	LambdaCanary10Percent5Minutes LambdaCanary10Percent30Minutes	Try X percent for N minutes then 100%
  AllAtOnce	-	No time to test the updated version, directly switch all traffic to specified version

ECS Platform

• This platform helps to automate the deployment of new ECS task definition.

• Supports only Blue/Green deployments.

• Application load balancer is required to do the traffic shift.

• The traffic shift strategy is same as strategies mentioned for Lambda Platform.