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Getting started with Gefyra and k3d

This guide will show you how to use Gefyra for the local development of a Kubernetes application running in k3d.

Prerequisites

  1. Follow the installation for your preferred platform.

  2. Create a local Kubernetes cluster with k3d like so:
    < v5
    k3d cluster create mycluster --agents 1 -p 8080:80@agent[0] -p 31820:31820/UDP@agent[0]
    

    >= v5

    k3d cluster create mycluster --agents 1 -p 8080:80@agent:0 -p 31820:31820/UDP@agent:0
    

    This creates a Kubernetes cluster that binds port 8080 and 31820 to localhost. kubectl context is immediately set to this cluster.

  3. Apply some workload, for example from the testing directory of this repo:
    kubectl apply -f https://raw.githubusercontent.com/gefyrahq/gefyra/main/testing/workloads/hello.yaml
    

    Check out this workload running under: http://hello.127.0.0.1.nip.io:8080/

Running Gefyra

  1. Set up Gefyra with
    gefyra up
    
  2. Run a local Docker image with Gefyra in order to make it part of the cluster.
    1. Build your Docker image with a local tag, for example from the testing directory: cd testing/images/ && docker build -f Dockerfile.local . -t pyserver
    2. Execute Gefyra’s run command:
      gefyra run -i pyserver -N mypyserver -n default
      
    3. Exec into the running container and look around. You will find the container to run within your Kubernetes cluster.
      docker exec -it mypyserver bash
      
      wget -O- hello-nginx
      

      will print out the website of the cluster service hello-nginx from within the cluster.

  3. Create a bridge in order to intercept the traffic to the cluster application with the one running locally:
    gefyra bridge -N mypyserver -n default --port 8000:80 --target deploy/hello-nginxdemo/hello-nginx
    

    Check out the locally running server comes up under: http://hello.127.0.0.1.nip.io:8080/

  4. List all running bridges:
    gefyra list --bridges
    
  5. Unbridge the local container and reset the cluster to its original state:
    gefyra unbridge -N mypybridge
    

    Check out the initial response from: http://hello.127.0.0.1.nip.io:8080/

Cleaning up

  1. Remove Gefyra’s components from the cluster with
    gefyra down
    
  2. Remove the locally running Kubernetes cluster with
    k3d cluster delete mycluster