Inspecting container network settings in Docker - Mini Project: Build & Apply

Inspecting container network settings

📖 Scenario: You are working with Docker containers and want to understand how they connect to networks. This helps you see which IP addresses and ports your containers use, just like checking the address and phone number of a house.

🎯 Goal: You will create a Docker container, check its network settings, and display the IP address assigned to it.

📋 What You'll Learn

Create a Docker container running the nginx image with the name mynginx

Use the docker inspect command to get network details of the container

Extract the IP address from the network settings

Print the IP address to the terminal

💡 Why This Matters

🌍 Real World

Knowing container network settings helps when you want to connect containers to each other or to your computer, like knowing the address to send mail or call a friend.

💼 Career

DevOps engineers often inspect container networks to troubleshoot connectivity issues and configure services correctly.

1

Create a Docker container named mynginx

Run the command docker run -d --name mynginx nginx to create and start a container named mynginx using the nginx image.

Docker

# Run the docker command to create the container
# Your code here

Need a hint?

This command downloads the nginx image if needed and runs it in the background with the name mynginx.

2

Inspect the container mynginx to get network details

Run the command docker inspect mynginx to see detailed information about the container, including its network settings.

Docker

docker run -d --name mynginx nginx
# Run the docker inspect command for mynginx
# Your code here

Need a hint?

This command shows a lot of details in JSON format about the container.

3

Extract the IP address from the container's network settings

Run the command docker inspect -f '{{ .NetworkSettings.Networks.bridge.IPAddress }}' mynginx to get only the IP address of the container.

Docker

docker run -d --name mynginx nginx
docker inspect mynginx
# Extract the IP address using docker inspect with format option
# Your code here

Need a hint?

The -f option formats the output to show only the IP address.

4

Display the IP address of the container

Run the command docker inspect -f '{{ .NetworkSettings.Networks.bridge.IPAddress }}' mynginx and observe the output which shows the container's IP address.

Docker

docker run -d --name mynginx nginx
docker inspect mynginx
docker inspect -f '{{ .NetworkSettings.Networks.bridge.IPAddress }}' mynginx
# Run the command to print the IP address
# Your code here

Need a hint?

The output should be an IP address starting with 172. or similar, showing the container's network address.