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March 31, 2022 03:46 pm GMT

Use CDK8S To Create AWS Controllers for Kubernetes Custom Resources

Abstract

There is question, How does ACK relate to cdk8s?
Answer: All of the ACK controllers watch for specific CRs and you can generate those resources using cdk8s. The two projects complement each other. cdk8s can create the Kubernetes resources and ACK uses those resources to create the AWS infrastructure.
This post gives example of generating kubernetes manifest of ACK using cdk8s typescript

Pre-requisite
Init cdk8s-app projen
Import ACK CRDS As CDK8S API
Get your hands dirty with code now
Build manifest
Conclusion

Pre-requisite

This post expects you have knowledge of ACK and cdk8s.
You can base on the AWS Controllers for Kubernetes Hands-on to test the generated manifests by cdk8s
projen is a plus

Init cdk8s-app projen

You can just init cdk8s project using cdk8s init typescript-app but following is used projen to mange configuration through code
Init cdk8s-app-ts with projen in typescript.

   $ projen new cdk8s-app-ts --projenrc-ts

cdk8s import

   $ cdk8s import --language typescript --output src/imports  Importing k8s v1.22.0...  Importing resources, this may take a few moments...  k8s

Import ACK CRDS As CDK8S API

s3-controller crds

   $ cdk8s import https://raw.githubusercontent.com/aws-controllers-k8s/s3-controller/main/helm/crds/s3.services.k8s.aws_buckets.yaml --output src/imports/  Importing resources, this may take a few moments...  s3.services.k8s.aws    s3.services.k8s.aws/bucket

rds-controller crds, rename file from rds.services.k8s.aws.ts to rds.services.db.instance.k8s.aws.ts after import due to that name is assigned for all CRDS with in the rds-controller crds

   $ cdk8s import https://raw.githubusercontent.com/aws-controllers-k8s/rds-controller/main/helm/crds/rds.services.k8s.aws_dbinstances.yaml --output src/imports/  Importing resources, this may take a few moments...  rds.services.k8s.aws    rds.services.k8s.aws/dbinstance   $ mv src/imports/rds.services.k8s.aws.ts src/imports/rds.services.db.instance.k8s.aws.ts

RDS subnet group, rename file from rds.services.k8s.aws.ts to rds.services.subnet.group.k8s.aws.ts

   $ cdk8s import https://raw.githubusercontent.com/aws-controllers-k8s/rds-controller/main/helm/crds/rds.services.k8s.aws_dbsubnetgroups.yaml --output src/imports/  Importing resources, this may take a few moments...  rds.services.k8s.aws    rds.services.k8s.aws/dbsubnetgroup   $ mv src/imports/rds.services.k8s.aws.ts src/imports/rds.services.subnet.group.k8s.aws.ts

Get your hands dirty with code now

  rds   constants.ts   db-instance.ts   subnet-group.ts

DBInstance requires subnet group which contains private subnets in EKS VPC (subnet-group.ts) and secret keys to hold user credential. The k8s secret is not generated through code here.
db-instance.ts defines specs of DbInstance
- S3

  s3   constants.ts   s3.ts

Build manifest

Just run yarn build

 $ yarn buildyarn run v1.22.15warning ../../../package.json: No license field$ npx projen build build  default | ts-node --project tsconfig.dev.json .projenrc.ts build  compile | tsc --build build  post-compile  synth | cdk8s synthNo manifests synthesized build  test | jest --passWithNoTests --all --updateSnapshotNo tests found, exiting with code 0----------|---------|----------|---------|---------|-------------------File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s----------|---------|----------|---------|---------|-------------------All files |       0 |        0 |       0 |       0 |----------|---------|----------|---------|---------|------------------- build  test  eslint | eslint --ext .ts,.tsx --fix --no-error-on-unmatched-pattern src test build-tools .projenrc.jsDone in 25.90s.

Output directory

  dist   rds      rds-db-instance.yaml      rds-subnet-group.yaml   s3       s3-test-bucket.yaml

We can now use the yaml files to create the AWS infrastructure through ACK

Conclusion

Although we have to import ACK CRDS resources for cdk8s API, we can manage k8s manifests through code

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Original Link: https://dev.to/vumdao/use-cdk8s-to-create-aws-controllers-for-kubernetes-custom-resources-4542

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