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Challenge - Build and run

Build an image and run the container on a specific port.

Challenge: build and run

Building an image, versioning it and running it with the right options is a series of commands. In this challenge you'll do a version-tagged build, inspect the image and start it in a production-like way:

docker build --pull -t api:1.0.0 -t api:latest .
docker history api:1.0.0
docker run -d --name api --restart unless-stopped -p 127.0.0.1:3000:3000 \
  --env-file api.env --memory 256m api:1.0.0
docker logs -f api

Practice Build and inspect

Write two commands: build from the current folder updating the base image, tagged both api:1.0.0 and api:latest; then show the layer history of api:1.0.0.

Starter code

terminal
# buraya yaz

Sample solution

terminal
docker build --pull -t api:1.0.0 -t api:latest .
docker history api:1.0.0

Expected output

[+] Building 7.1s (12/12) FINISHED
 => naming to docker.io/library/api:1.0.0 done
IMAGE          CREATED         CREATED BY                    SIZE
4f1e2d3c4b5a   3 seconds ago   CMD ["node" "server.js"]      0B

Practice Run like production

Start a container named api from api:1.0.0 with one command: in the background; restarting unless stopped by hand; port 3000 published only on 127.0.0.1; settings from api.env; memory limited to 256m.

Starter code

terminal
# buraya yaz

Expected output

7e8f90a1b2c3

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 In this run, can the API be reached from another computer on the same network?

  • Only if --memory is removed
  • No, the port is bound only to 127.0.0.1 Correct answer
  • Yes, through port 3000
  • Only after a restart

Explanation: To expose it, a reverse proxy is usually put in front.

2 Limit the container's memory.

Question 
docker run -d ____ 256m api:1.0.0
Answer 
docker run -d --memory 256m api:1.0.0

Explanation: --memory (or -m) is a cgroup limit.

3 Match.

Term Meaning
--pull Fresh base image
--restart unless-stopped Resilience
--env-file Settings
127.0.0.1:3000:3000 Local access only

All lessons in Beginner

1 What is Docker?

  1. What is Docker?
  2. Containers and virtual machines
  3. Images and containers
  4. Docker architecture
  5. Use cases
  6. Summary - What is Docker

2 Installation and first commands

  1. Installing Docker
  2. docker version
  3. docker info
  4. The hello-world container
  5. Docker Desktop
  6. Summary - Installation

3 First container

  1. docker run basics
  2. Running in the background
  3. docker ps
  4. docker stop and rm
  5. docker logs
  6. Summary - First container

4 Dockerfile basics

  1. What is a Dockerfile?
  2. The FROM instruction
  3. The RUN instruction
  4. COPY and ADD
  5. CMD and ENTRYPOINT
  6. Summary - Dockerfile

5 Build and images

  1. docker build
  2. Tagging images
  3. Build context
  4. Layers and cache
  5. .dockerignore
  6. Summary - Build

6 docker run options

  1. Interactive mode
  2. Naming containers
  3. Restart policy
  4. Working directory
  5. Switching users
  6. Summary - docker run

7 Image management

  1. docker images
  2. docker rmi
  3. docker pull
  4. docker push
  5. docker tag
  6. Summary - Image management

8 Port mapping

  1. The port concept
  2. The -p flag
  3. Multiple ports
  4. Random ports
  5. IP binding
  6. Summary - Port mapping

9 Volumes and data

  1. Data persistence
  2. Named volumes
  3. The -v flag
  4. Bind mounts
  5. Volume management
  6. Summary - Volumes

10 Environment variables

  1. The -e flag
  2. The ENV instruction
  3. The ARG instruction
  4. env-file
  5. The WORKDIR instruction
  6. Summary - Environment

11 Project: docker-compose

  1. Compose design
  2. Service definition
  3. Database service
  4. Volume and network
  5. Putting it together - compose

12 Docker Hub and registry

  1. What is Docker Hub?
  2. docker login
  3. Searching images
  4. Official images
  5. Private registry
  6. Summary - Registry

13 Network basics

  1. Network drivers
  2. docker network ls
  3. Bridge network
  4. Container connectivity
  5. Publishing ports
  6. Summary - Network

14 Beginner final

  1. Challenge - Dockerfile
  2. Challenge - Build and run
  3. Challenge - Volume
  4. Challenge - Compose
  5. Challenge - Beginner project