CICD-simple_example

Simple example using Git actions + Argo CD + K8S + Docker and GO lang

Intro

Pre reqs

• Have an ArgoCD account and Installed.
• Docker installed.
• Have k3D intalled.
• Kubectl installed.
• Have a Github account.
• Unlimited of curiosity to learn new things.

Steps

1. Create a K8S cluster k3d cluster create {clustername} (It is in your preference host, in this case are local with K3D).
2. To list all contexts kubectl config get-contexts.
3. Enter in K8S cluster's context kubectl cluster-info --context {clustername}.
4. See if nodes are ok in cluster with kubectl get nodes.
5. Create a app that you need, in this case a simple webserver in go.
6. Make a Dockerfile using multistage build.
7. Build image and send to registry if is necessary (in this case I will maintain local) docker build -t {myname}/{imagename}:{tag} ..
8. Run image with command docker run --rm -p 9090:9090.
9. Insert in line 16 of file k8s/deployment.yamlyour image address and in line 22 the port of application.
10. To run deployment in your kubernetes cluster use the command: kubectl apply -f k8s/deployment.yaml.
11. To see if deployment is running use kubectl get pods.
14. To delete cluster k3d cluster delete {clustername}.

About Dockerfile

Explain about dockerfile for generating go image

# Multistage build
# First image compile a binary in GO

FROM golang:1.17 as build 
WORKDIR /app
COPY . . 
RUN CGO_ENABLED=0 go build -o server main.go

# Second image catch a binary from first and generate a simple and light image to use in webserver

FROM alpine:3.12
WORKDIR /app
COPY --from=build /app/server .
CMD ["./server"]

Reference

Materials used to reference:

Deploy contínuo com GitOps e ArgoCD k3d Docs ArgoCD ArgoCD Get Started