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docker push

Learn to push images to a registry with docker push.

docker push

docker push uploads a local image to the registry. The image name must contain the target registry and account; for Docker Hub, user/repository:tag:

docker login
docker tag api:1.2.0 ali/api:1.2.0
docker push ali/api:1.2.0

Layers already in the registry aren't uploaded again (Layer already exists); only the changed ones go.

Pushing all tags

To push all tags of a repository at once, --all-tags is used. For another registry, the address is written at the start of the name:

docker push --all-tags ali/api
docker tag api:1.2.0 ghcr.io/ali/api:1.2.0
docker push ghcr.io/ali/api:1.2.0

Practice Publish to Docker Hub

Write three commands: log in to Docker Hub; tag the local api:1.3.0 image as ali/api:1.3.0; push it.

Starter code

terminal
# buraya yaz

Sample solution

terminal
docker login
docker tag api:1.3.0 ali/api:1.3.0
docker push ali/api:1.3.0

Expected output

Login Succeeded
The push refers to repository [docker.io/ali/api]
5f6e7d8c9b0a: Pushed
a2318d6c47ec: Layer already exists
1.3.0: digest: sha256:7b1c… size: 1789

Questions and answers

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

1 Why does docker push api:1.2.0 give "denied: requested access to the resource is denied"?

  • The image is too big
  • There is no internet
  • The tag is malformed
  • The name has no account, so it tries to push to library/api Correct answer

Explanation: It must first be tagged as user/api:1.2.0.

2 Push all tags of the repository.

Question 
docker push ____ ali/api
Answer 
docker push --all-tags ali/api

Explanation: --all-tags uploads every tag in the repository.

3 Match.

Term Meaning
docker login Authentication
docker tag Give the target name
docker push Upload
Layer already exists Skipped layer

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