Upload Docker Images to Kubernetes Registry

In this post, we will cover the topic ‘Upload Docker Images to Kubernetes Registry’ with multiple docker command examples and different scenerios wherever it is applicable. So this will help to understand the options available in docker command and how to use those commands and its option.

The docker push command is used to upload Docker images to a Kubernetes registry. This allows developers to share their Docker images across different environments or deploy them to Kubernetes clusters.

Here are several examples demonstrating the usage of docker push with different scenarios:

Example 1: Pushing a Docker image to Docker Hub:

docker push username/image-name:tag

This command uploads the Docker image image-name with tag tag to Docker Hub under the specified username.

Output: If successful, it will display the layers being pushed and the final push status.

Verification: Check the Docker Hub repository under the specified username to confirm that the image has been pushed successfully.

Example 2: Pushing to a private registry:

docker push registry.example.com/image-name:tag

This command pushes the Docker image image-name with tag tag to a private registry hosted at registry.example.com.

Output: Similar to Example 1, it will show the layers being pushed and the final push status.

Verification: Access the private registry UI or API to verify that the image has been uploaded successfully.

Example 3: Pushing a specific image version:

docker push username/image-name:v1.0.0

This command specifically pushes version v1.0.0 of the Docker image image-name to Docker Hub.

Output: Shows the upload progress and final status upon completion.

Verification: Confirm on Docker Hub that the version v1.0.0 of the image is available in the repository.

Example 4: Pushing a multi-architecture image:

docker push username/image-name:latest --platform linux/amd64,linux/arm64

Here, the command pushes the latest tag of the Docker image image-name for both AMD64 and ARM64 architectures.

Output: Displays the upload progress for each architecture and their final push statuses.

Verification: Check the Docker Hub repository to ensure that the image has been successfully pushed for both architectures.

Example 5: Pushing with authentication:

docker login registry.example.com
docker push registry.example.com/image-name:tag

First, authenticate to the private registry using docker login, then push the Docker image image-name to registry.example.com.

Output: Requires successful login followed by the push progress and final status.

Verification: Check the private registry to confirm the presence of the pushed image under the specified tag.

Example 6: Pushing an image with specific credentials:

docker push username/image-name:tag --username myuser --password mypassword

This command pushes the Docker image image-name to Docker Hub using the provided username and password for authentication.

Output: Shows the upload process and final push status with the specified credentials.

Verification: Check Docker Hub to ensure that the image has been successfully uploaded under the specified credentials.

Example 7: Pushing with a specific Dockerfile:

docker build -t myimage .
docker push username/myimage:tag

This sequence first builds a Docker image using the Dockerfile in the current directory, tags it as myimage, and then pushes it to Docker Hub under the specified username.

Output: Shows build progress and the subsequent push status upon completion.

Verification: Confirm on Docker Hub that the image myimage with the specified tag has been pushed successfully.

Example 8: Pushing an image with a build argument:

docker build -t myimage --build-arg VERSION=1.0.0 .
docker push username/myimage:tag

This command builds a Docker image with a build argument VERSION set to 1.0.0 and then pushes it to Docker Hub under the specified username.

Output: Displays the build progress and subsequent push status.

Verification: Check Docker Hub to confirm that the image myimage with the specified tag has been successfully uploaded.

Example 9: Pushing a Docker Compose service:

docker-compose build myservice
docker-compose push

This sequence builds the Docker Compose service myservice and then pushes it to the registry specified in the docker-compose.yml file.

Output: Shows the build progress for each service and the final push status.

Verification: Verify on the specified registry that the Docker Compose service has been successfully uploaded.

Example 10: Pushing an image to a specific Kubernetes cluster:

docker push gcr.io/project-id/image-name:tag

This command pushes the Docker image image-name with tag tag to Google Container Registry (GCR) associated with the specified project-id.

Output: Displays the upload progress and final status upon completion.

Verification: Check GCR to confirm that the image has been successfully pushed to the project’s registry.

Also check similar articles.

Download Docker Images for Kubernetes
Build Docker Images for Kubernetes
Execute Commands Inside Running Kubernetes Containers
How to Create and Run a New Container in Kubernetes?
Interacting with Kubernetes Plugins using kubectl plugin