Introduction

Docker.io or also known as Dockerhub is a public Docker repository in which people can store their own docker containers and have it available across the internet.

Theory

As opposed to having hosting a private docker registry it is also possible to use a docker registry hosted by the cloud. I chose Dockerhub because this registry permits the use of a single private registry. I will use this to deploy my Ramses containers to.

Execution

After creating my Dockerhub account I created a repository called ramses, which I also turned private. By using the tag badministrator/ramses:latest I could pull it, given that I was logged in. But instead of wanting to log in every time, I instead created a secret token.

https://i.imgur.com/TfnhIpd.png

I used this secret token to integrate into my Jenkins pipeline.

https://i.imgur.com/7ryLCD8.png

In my Microservices I created various Dockerfile’s. An example output of such can be seen below.

#
# Build stage
#
FROM maven:3.6.0-jdk-11-slim AS build
COPY src /home/app/src
COPY pom.xml /home/app
RUN mvn -f /home/app/pom.xml clean package

#
# Package stage
#
FROM openjdk:11-jre-slim
COPY --from=build /home/app/target/CommentService-1.jar /usr/local/lib/CommentService-1.jar
EXPOSE 9521
ENTRYPOINT ["java","-jar","/usr/local/lib/CommentService-1.jar"]

And when Jenkins builds a microservice, it will have a specific ${WORKSPACE} in which I bind the location of the Dockerfile and have Jenkins publish to Docker.io as can be seen here:

b62faa563742: Pushing [=================================================> ]  81.86MB/82.26MB
b62faa563742: Pushing [==================================================>]  82.26MB
b62faa563742: Pushed
userservice: digest: sha256:dd77e120ec222a872d3007f35e1803af48dd44b88b85647eb980e87b8d3b5a86 size: 1371
Cleaning local images [df63584981d0]
Docker Build Done
Finished: SUCCESS