Week 8 - Quiz

📘 Instructions

  • Attempt all questions.
  • Do not copy answers from the internet.
  • Try to explain concepts in your own words.
  • Some questions are conceptual while others are practical.
  • Think like a backend engineer while answering.

🧠 Section 1 - Basic Concepts

Question 1

What is Docker?

Question 2

What problem does Docker solve in software development?

Question 3

What is the difference between:

  • Docker Image
  • Docker Container

Question 4

What is a Dockerfile?

Question 5

What is Docker Hub?

Question 6

Explain the difference between:

  • Containers
  • Virtual Machines

Question 7

Why are containers considered lightweight?

Question 8

What is port mapping in Docker?

Question 9

Why are environment variables important in containerized applications?

Question 10

What is Docker Compose?

⚙ Section 2 - Docker Commands

Question 11

What does the following command do?

```bash id=”x2v8m4” docker ps


---

# Question 12

What is the difference between:

```bash id="y8q4n2"
docker ps

and

```bash id=”r7m1k5” docker ps -a


---

# Question 13

What does the following command do?

```bash id="p9w2d6"
docker images

Question 14

Explain the purpose of:

```bash id=”m4t7q1” docker logs 


---

# Question 15

How do you stop a running container?

---

# Question 16

How do you remove a container?

---

# Question 17

How do you remove a Docker image?

---

# Question 18

What does the following command do?

```bash id="z5k1v8"
docker exec -it <container-id> bash

🏗 Section 3 - Dockerfile Understanding

Question 19

Explain the purpose of the following instruction:

```dockerfile id=”w7f3m2” FROM openjdk:17


---

# Question 20

What does the following instruction do?

```dockerfile id="h4x8q6"
WORKDIR /app

Question 21

What is the purpose of:

```dockerfile id=”n8s5d1” COPY target/app.jar app.jar


---

# Question 22

Why do we use:

```dockerfile id="j2m9p4"
EXPOSE 8080

Question 23

Explain the purpose of:

```dockerfile id=”q6t1v9” ENTRYPOINT [“java”, “-jar”, “app.jar”]


---

# Question 24

What happens when you execute:

```bash id="g8w3r5"
docker build -t my-app .

🌱 Section 4 - Spring Boot and Docker

Question 25

Why are Spring Boot applications easy to containerize?

Question 26

What is an executable JAR?

Question 27

How can you access a Spring Boot application running inside Docker?

Question 28

What happens if the application port is not mapped correctly?

Question 29

Why are logs important while running Spring Boot applications in containers?

🗄 Section 5 - Database Containers

Question 30

Why do developers run databases inside Docker containers?

Question 31

What does the following command do?

```bash id=”d9m6v2” docker run -d
-p 3306:3306
-e MYSQL_ROOT_PASSWORD=password
mysql:8


---

# Question 32

What is the purpose of:

```bash id="b2n7s5"
MYSQL_ROOT_PASSWORD

Question 33

What problems can occur if the application cannot connect to the database container?

🔗 Section 6 - Docker Compose

Question 34

Why is Docker Compose useful?

Question 35

What is the purpose of docker-compose.yml?

Question 36

Explain the purpose of:

yaml id="m5x8k1" depends_on

in Docker Compose.

Question 37

What command is used to start services using Docker Compose?

Question 38

What command is used to stop services started using Docker Compose?

🛠 Section 7 - Debugging and Troubleshooting

Question 39

A container exits immediately after startup. What could be the possible reasons?

Question 40

How can you inspect container logs?

Question 41

What happens if two containers try to use the same host port?

Question 42

How would you debug a failed Docker image build?

Question 43

What should you check if APIs are not reachable from browser or Postman?

🚀 Section 8 - Real World Understanding

Question 44

Why is Docker important in cloud-native development?

Question 45

How does Docker help DevOps teams?

Question 46

Why do microservices architectures commonly use containers?

Question 47

What is the relationship between Docker and Kubernetes?

Question 48

Why should developers understand deployment concepts?

⭐ Bonus Questions

Bonus Question 1

Explain a real-world scenario where Docker simplifies software deployment.

Bonus Question 2

What are some advantages of containerization over traditional deployment methods?

Bonus Question 3

What additional technologies would you like to learn after Docker?

Examples:

  • Kubernetes
  • OpenShift
  • CI/CD
  • Helm
  • Cloud Platforms

Explain why.

🧠 Reflection Questions

  1. Which Docker concepts were easiest to understand?
  2. Which areas need more practice?
  3. What deployment-related problems did you face during exercises?
  4. How confident are you with Docker now?
  5. What would you like to explore next?

📜 License

This project is licensed under the GNU GPL-3.0 License.

Maintained by Aditya Pratap Bhuyan LinkedIn: https://linkedin.com/in/adityabhuyan

This site uses Just the Docs, a documentation theme for Jekyll.