jasonumiker / K8s Plus Aws Gitops
Licence: mit
An approach for GitOps of AWS backing resources like databases with CodePipeline together with Kubernetes via Flux
Stars: ✭ 87
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An example approach for Kubernetes and AWS GitOps
This is a prototype for an approach for GitOps that covers both AWS Managed Services as well as Kubernetes, each with their native tooling, for a more seamless and modern experience.
It represents the AWS-specific resources (such as VPCs, EKS clusters and databases) via CDK/CloudFormation in one set of folders and another set for the Kubernetes equivalents. There are then two separate tools (CodePipeline and Flux) that reconcile the different types of declarative Infrastructure-as-Code in this project - but all the end-user needs to know is to push/merge their changes to the Git repo.
Gettting started
There are README.mds in each subfolder explaining how that section works and how to deploy it.
The GitOps folder structure is:
k8s-plus-aws-gitops/
- aws-infrastructure/ for the AWS-specific infrastructure resources (VPC, EKS cluster, etc.)
- aws-app-resources/ for the AWS and application-specific resources (databases, caches, queues, etc.)
- k8s-app-resources: for the Kubernetes and application-specific resources (Deployments, Services, Ingresses, etc.)
- dockerbuild: for the Dockerfile(s) and associated items required to build the app into a container such as the CodeBuild buildspec.yml(s)
Start in the aws-infrastructure folder as it deploys the AWS and EKS environments as well as deploys the pipelines for a GitOps appraoch of aws-app-resources, k8s-app-resources and dockerbuild.
The interactions between AWS and Kubernetes (via a couple Operators/CRDs)
There are basically two main workflows that are happening between AWS and Kubernetes here:
- Secrets upserting / syncronisation
- First the CDK creates a secret with the password of our RDS
- Then The External Secrets Controller retrieves this secret and puts it into a Kubernetes Secret our pod spec references as Environment Variables into the container(s) to connect to its database.
- Ingress Network Routing
- First the ALB Ingress controller creates an ALB and exposes our service via the ALB by updating the Target Group with VPC-native Pod IPs (which is more efficient than NATing through the Hosts with a NodePort on each host)
- Then the External DNS Controller updates a CNAME to the ALB for the service with the 'real' name/FQDN that we want to expose it to the Internet.
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