Appendix B SAmple Code You can use Zuul to load balance microservices, as shown in Figure B-21. When Zuul receives a request, it routes the request to one of the physical locations available. The process of caching the location of the service instance and forwarding the request to the actual location is provided out of the box. Request 1 Instance1 (Request 1) Request 2 Zuul Instance2 (Request 2) Request 3 Instance3 (Request 3) Figure B-21. ZUUL load balancing Docker After checking that all the services are running locally, you can use Docker to containerize these microservices. You can download and install Docker CE on your local machine from the following URL: https://docs.docker.com/get-started/. Components Dockerfile: It is a text file that contains all the instruction to build a Docker image;, these files contain steps to copy files and do installation. For more information, you can check the following link: https://docs.docker.com/engine/reference/builder/ Docker Composer: Docker Composer creates and spawns multiple containers. It helps to build the required environment. 363