Distributing Docker Images
Introduction to Docker
Tim Sangster
Software Engineer @ DataCamp
Private Docker registries
- Unlike Docker official images there is no quality guarantee
- Name starts with the url of the private registry
dockerhub.myprivateregistry.com/classify_spam
docker pull dockerhub.myprivateregistry.com/classify_spam:v1
Using tag: v1
latest: Pulling from dockerhub.myprivateregistry.com
ed02c6ade914: Pull complete
Digest: sha256:b6b83d3c331794420340093eb706b6f152d9c1fa51b262d9bf34594887c2c7ac
Status: Downloaded newer image for dockerhub.myprivateregistry.com/classify_spam:v1
dockerhub.myprivateregistry.com/classify_spam:v1
Pushing to a registry
docker image push <image name>
Pushing to a specific registry --> name of the image needs to start with the registry url
docker tag classify_spam:v1 dockerhub.myprivateregistry.com/classify_spam:v1
docker image push dockerhub.myprivateregistry.com/classify_spam:v1
Authenticating against a registry
- Docker official images --> No authentication needed
- Private Docker repository --> Owner can choose
docker login dockerhub.myprivateregistry.com
user@pc ~ % docker login dockerhub.myprivateregistry.com
Username: student
Password:
Login succeeded
Docker images as files
Sending a Docker image to one or a few people? Send it as a file!
Save an image
docker save -o image.tar classify_spam:v1
Load an image
docker load -i image.tar
Summary of new commands
| Usage | Command |
|---|---|
| Pull image from private registry | docker pull <private-registry-url>/<image-name> |
| Name an image | docker tag <old-name> <new-name> |
| Push an image | docker image push <image-name> |
| Login to private registry | docker login <private-registry-url> |
| Save image to file | docker save -o <file-name> <image-name> |
| Load image from file | docker load -i <file-name> |
Let's practice!
Introduction to Docker
