Introduction

This repository contains experiment to build Containers suitable for the development of applications inside the container.

Goal:

• Offer all CLI commands of a standard Debian distribution suitable for development and hacking.
• Suitable as a dev container for VS Code via Remote SSH.
• Runnable as a non-root Pod in Kubernetes.

Design

• The container will simply run an OpenSSH server upon startup, compatible with RSA, DSA, ECDSA, and ED25519.
• Upon startup the container reads the AUTHORIZED_KEYS environment variable to configure OpenSSH.
• The private keys of OpenSSH are generated upon Container startup so that each user of the Container have different keys and prevent MITM attacks.

Node.js

Install

• sudo docker build . -t debackerl/node-dev-env:14.17.0

• sudo docker run --rm -it debackerl/node-dev-env:14.17.0

• sudo docker push debackerl/node-dev-env:14.17.0

• kubectl apply -f k8s-manifests/namespace.yaml

• kubectl apply -f k8s-manifests/node-dev-pod.yaml

• kubectl -n laurent port-forward pod/node-dev-pod 2222:2222

• ssh-keygen -f "/home/laurent/.ssh/known_hosts" -R "[localhost]:2222"

• ssh -p 2222 developer@localhost

Now, we could successfully open a Terminal to our remote container via SSH. Let's connect via VS Code now:

• Open VS Code

• Enter command: "Remote-SSH: Connect to Host..."

• "Add new SSH Host..."

• Enter "ssh -p 2222 developer@localhost -A"

• Now, enter again "Remote-SSH: Connect to Host..."

• Choose your new host: "localhost"

• In VS Code's Explorer, click "Open Folder"

• Open new terminal and type:

• npm install -g express-generator

• express myExpressApp --view pug

• cd myExpressApp

• npm install

• Enter command in VS Code: "Forward a Port", enter port '3000'

• Press F5, and choose Node.js environment

Demo: https://youtu.be/auHXPUvhVf4

Manual build of the container:

• sudo docker build . -t XXX/node-dev-env:14.17.0
• sudo docker push XXX/node-dev-env:14.17.0

.NET Core

• kubectl apply -f k8s-manifests/namespace.yaml

• kubectl apply -f k8s-manifests/dotnet-dev-pod.yaml

• kubectl -n laurent port-forward pod/dotnet-dev-pod 2222:2222

• ssh-keygen -f "/home/laurent/.ssh/known_hosts" -R "[localhost]:2222"

• ssh -p 2222 developer@localhost

• Open VS Code

• Enter command: "Remote-SSH: Connect to Host..."

• "Add new SSH Host..."

• Enter "ssh -p 2222 developer@localhost -A"

• Now, enter again "Remote-SSH: Connect to Host..."

• Choose your new host: "localhost"

• Open new terminal and type:

• dotnet new webapi -o SampleApi

• cd SampleApi

• In VS Code's Explorer, click "Open Folder"

• In VS Code's extension manager, search for ms-dotnettools.csharp

• Choose "Install in SSH"

• Open the "Run and Debug" side panel, and click "Start Debugging"

• Opening your browser to https://localhost:5001/WeatherForecast