Or another example, imagine that our Service for paying with Visa cards generates IDs for the Payment Gateway, and as a result of the new implementation the IDs generated are returned. Imagine that the Unit Tests for the Service do not test that, and that was not causing a problem in the old version of the Service and so it will crash when the new Service is deployed. Imagine a change in Javascript Front End, that results in a call a bit different, for example, with an space before a name. In an Application there are several components, often a change in the Front End can break the application. I recommend this specially because Microservices are end-points, independent of the implementation, but normally they are API that serve to a whole application. By this I mean, to conduct tests that really test the functionality of everything, using a real browser and emulating the acts of a user (for example with BeHat, Cucumber or with JMeter). Before deploying to Production the new Service, I recommend running special Application Tests / Behavior-driven.If platform tests pass, the service is promoted to the next environment (for example Dev -> Test -> PreProd -> Prod), the exact same machine is started in the next environment and platform tests are repeated.Look at Spotify Docker Plugin to Docker build from Maven), or with Apache, PHP, other dependencies, and the code. Generate a Machine image with your JAR deployed (for Java.Java JAR with Tomcat server and other dependencies) Compile the service to an executable artifact (f.e.Pull the latest code for the Service from the git repository.In any case, you will be using CI/CD and your pipeline will be something like this: It is not unlikely that you’ll use one language for some of your Services and another for other, as well as a Database or another, as each Service is owner of their data. Using many repos, one per Service, also allows to deploy only that repository and to have better security, with independent deployment tokens. You’ll have many git repositories, one per each Service. Tcp/Ip listening port will be set at start via command line, or through environment. In Java you’ll use Spring Cloud and Spring Boot, and every Service will be auto-contained in its own JAR file, that includes Apache Tomcat and all other Dependencies and normally running inside a Docker. Usually you’ll use Docker, but you have to add a Web Server and any other tools, as the source code is not packet with a Web Server and other Dependencies like it is in Java Spring Boot. You’ll rely in Software to split your microservices. ![]() In PHP you’ll use a Frameworks like Laravel, or Symfony, or Catalonia Framework (my Framework) :) and a repo or many (as the idea is that the change in one microservice cannot break another it is recommended to have one git repo per Service) and split the requests with the API Gateway and Filters (so /billing/ goes to the right path in the right Server, is like rewriting URLs). In Python you’ll probably use Flask, and listen to the port you want, inside Docker Container. First you have to understand that Python, Java and PHP are worlds completely different.
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