Resource monitoring per container in Docker - Mini Project: Build & Apply

Resource monitoring per container

📖 Scenario: You are managing multiple Docker containers running different applications on your server. To keep your system healthy, you want to monitor how much CPU and memory each container is using.

🎯 Goal: Build a simple setup to list all running Docker containers and display their CPU and memory usage in a clear way.

📋 What You'll Learn

Use the docker ps command to list running containers.

Use the docker stats --no-stream command to get current CPU and memory usage per container.

Extract container IDs and names to show alongside resource usage.

Display the information in a readable format.

💡 Why This Matters

🌍 Real World

Monitoring resource usage per container helps keep servers stable and prevents any container from using too many resources.

💼 Career

DevOps engineers often monitor container resources to optimize performance and troubleshoot issues in production environments.

1

List running Docker containers

Run the command docker ps --format "{{.ID}} {{.Names}}" to list all running containers with their IDs and names.

Docker

# Run the command to list container IDs and names
# Your code here

Need a hint?

This command shows container IDs and names in a simple list.

2

Get resource usage snapshot

Run the command docker stats --no-stream --format "{{.Container}} {{.CPUPerc}} {{.MemUsage}}" to get a one-time snapshot of CPU and memory usage for each container.

Docker

docker ps --format "{{.ID}} {{.Names}}"
# Run the command to get CPU and memory usage snapshot
# Your code here

Need a hint?

This command shows CPU and memory usage once, without continuous updates.

3

Match container names with resource usage

Use the command docker ps --format "{{.ID}} {{.Names}}" and docker stats --no-stream --format "{{.Container}} {{.CPUPerc}} {{.MemUsage}}" together to match container names with their CPU and memory usage. You can use a shell loop or script to combine this information.

Docker

docker ps --format "{{.ID}} {{.Names}}"
docker stats --no-stream --format "{{.Container}} {{.CPUPerc}} {{.MemUsage}}"
# Combine container names with their resource usage below
# Your code here

Need a hint?

This loop gets each container's name and resource usage, then prints them together.

4

Display resource usage per container

Print the container name followed by its CPU and memory usage in the format: container_name: CPU% MemoryUsage. Use the loop from Step 3 to display this information.

Docker

docker ps --format "{{.ID}} {{.Names}}"
docker stats --no-stream --format "{{.Container}} {{.CPUPerc}} {{.MemUsage}}"

for id in $(docker ps -q); do
  name=$(docker ps --filter "id=$id" --format "{{.Names}}")
  stats=$(docker stats --no-stream --format "{{.CPUPerc}} {{.MemUsage}}" $id)
  # Print container name with CPU and memory usage
  # Your code here
done

Need a hint?

The output should show each container's name followed by its CPU and memory usage.