Show List
Pushing Docker Image to Docker Hub
Docker hub is a service provided by docker to host the docker images and share with others. In this example, we are going to create a docker image from docker file and push it to docker hub.
Create a docker hub account if you do not have that already by going to the official website https://hub.docker.com/.
Create a repository by clicking on the "Create Repository" button on top right.
Once the repository is created, command to push the image to the docker hub is displayed on the repository page.
We are using the below Dockerfile to create the image to push to the above repo. This for a Java Spring Boot application that we created in the Earlier Chapter .
Dockerfile :
FROM adoptopenjdk/openjdk15:ubi
COPY target/*.jar app.jar
EXPOSE 8080
CMD ["java", "-jar", "app.jar"]
The docker file is present in the root of the folder. Jar file for the project is present in the target folder.
Creating Docker Image
Start the Docker desktop application. Navigate to the root folder from command prompt and run below command. Note that the name matches the format provided on docker hub page:
"docker build -t itcodelab/firstrepo:docker-rest-image ."
This would create the image and tag with name "docker-rest-image"
C:\Users\mail2\Downloads\Spring-Boot-Rest-Service>docker build -t itcodelab/firstrepo:docker-rest-image . => [internal] load build definition from Dockerfile 0.1s => => transferring dockerfile: 534B 0.0s => [internal] load .dockerignore 0.0s => => transferring context: 76B 0.0s => [internal] load metadata for docker.io/adoptopenjdk/openjdk15:ubi 0.8s => [auth] adoptopenjdk/openjdk15:pull token for registry-1.docker.io 0.0s => [internal] load build context 0.0s => => transferring context: 80B 0.0s => [1/3] FROM docker.io/adoptopenjdk/openjdk15:ubi@sha256:c860508ce2f180bb58dcb225b0ec967b3730e2f21fbc9351aeaeb71c498aa5f8 0.0s => CACHED [2/3] COPY target/*.jar app.jar 0.0s => [3/3] RUN useradd springuser 0.9s => exporting to image 0.1s => => exporting layers 0.1s => => writing image sha256:b3972f58abb04761e79baa5366c8462e0627dc1fe85152dfa89bc5657b8121f8 0.0s => => naming to docker.io/itcodelab/firstrepo:docker-rest-image 0.0s Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
The image can now be pushed to docker hub using command "docker push itcodelab/firstrepo:docker-rest-image"
C:\Users\mail2\Downloads\Spring-Boot-Rest-Service>docker push itcodelab/firstrepo:docker-rest-image The push refers to repository [docker.io/itcodelab/firstrepo] 2242c1bf58a6: Pushed a3bc21525fe2: Pushed 070cec23ffc6: Pushed 6f50cb0a77ab: Pushed 525ed45dbdb1: Pushed 5bc03dec6239: Pushed docker-rest-image: digest: sha256:162cf4bb85a916fd09913a623ad252fdd0214129086811a61cf8e5fe580bb81c size: 1582
The image can also be pushed from the Docker Desktop
Leave a Comment