In this tutorial, we are going to learn about Service Discovery and its implementation in Microservices, which is a very important question in the interview room.

Service Discovery

• Service Discovery is used to find where is the network location of that service, including IP and DNS name, to make a point to point connection.
• Service discovery is needed because in the cloud, i.e., Amazon Web Services have dynamic IP’s and DNS names.

• Service instances, i.e., (virtual machines or containers) register or write their IP or DNS name into a container called service registry.

  • You can think of service registry as a table in a database that has two columns.
  • One column is the name of the microservices and Another column is the IP address of the instance.
  • And you may have multiple roles in that table with the same microservice name, but with different IP’s.
• Service registry is a list of key value pair.

There are two ways of performing service discovery.

1. Client side service discovery
2. Server side service discovery