Docker Environment Variables and Networking

Tue, 16 Jun 2026 06:50:38 +0000

In this lab, we’ll explore:

Inspecting environment variables in running containers
Passing environment variables at runtime
Deploying MySQL containers
Creating custom Docker networks
Connecting applications and databases across containers

Task 1: Inspect Environment Variables

First, identify the value configured for the APP_COLOR environment variable in a running container.

List the running containers:

$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cdf886f902d4 kodekloud/simple-webapp "python app.py" 10 minutes ago Up 10 minutes 8080/tcp mystifying_knuth

Inspect the container and look for the Env section:

How to Set Git Username and Email Using Environment Variables

Wed, 11 Sep 2024 15:39:06 +0530

Introduction

Git associates a username and email with every commit. The username and email are retrieved from Git’s configuration, which can be set globally (for all repositories) or locally (for a specific repository). For example to set the username globally, you can run the command git config --global user.name "Your Name".

However, an alternative way to achieve this is by using environment variables. This can be useful for several reasons, such as:

Environment variables on Nerdsid.com

Docker Environment Variables and Networking

Task 1: Inspect Environment Variables

How to Set Git Username and Email Using Environment Variables

Introduction