Go K8S CICD
This is an example of using CodeBuild and Codepipeline for Application Deployment in EKS.
This is to be used together with Terraform EKS Automation [https://github.com/shawnxlw/terraform-eks-automation]
Components
Dockerfile
Instead of base on golang:latest which is almost 800mb in size, the image is built FROM scratch (literally 0kb!) and only add in the binary compiled outside.
The binary is complied with statcially linked libraries in CodeBuild build stage with golang:alpine image:
docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp -e CGO_ENABLED=0 -e GOOS=linux golang:alpine go build -a -installsuffix cgo -o main -v .
Makefile
Makefile automates the binary build, image build and clean up tasks.
Build Specs
buildspec/build.yml is the build spec for building and pushing image to ECR repo.
buildspec/deploy.yml is the build spec for deploying application to EKS with kubectl apply
Kube Specs
kubespec/deployment.yml contains two deployments each per AZ with nodeAffinity to balance pods across AZs. This is a workaround. There is an open PR on this issue: [kubernetes/kubernetes#68981]
kubespec/service.yml contains LoadBalancer type Service for exposing the application to the internet. This is fine if the cluster only runs this one app, consider Nginx Ingress otherwise.
How to use
With CI/CD
Apply Terraform EKS Automation to create the CI/CD pipeline and CodeCommit git repo. Commit code to the repo and application will be built and deployed automatically.
Manual
To build the binary, build the image and clean up, run
make
To just build the binary, run
make go_build