How to access Kubernetes microservices among themselves?
In Kubernetes, microservices can be accessed in several ways.
- Utilizing Service: Kubernetes Service resources allow multiple pods to be encapsulated into a single logical service, providing a unified entry point for that service. Other microservices can access this service through the Service’s Cluster IP or service name.
- Ingress is a resource object in Kubernetes used to route external requests to services within the cluster. By defining Ingress rules, requests can be routed to different microservices based on URL paths or domain names.
- Utilizing environment variables or configuration files: when deploying microservices in Pods, the address and port of other microservices can be passed to the current microservice through environment variables or configuration files. This allows the current microservice to access other microservices directly through that address and port.
- By utilizing DNS resolution, each Pod within the Kubernetes cluster is assigned a unique domain name that can be used to directly access other service Pods. This domain name can be used as a substitute for IP addresses when accessing the Pods.
It is important to note that the methods mentioned above are all based on Kubernetes’ internal service discovery and networking mechanisms. It is usually recommended to use Service and Ingress for communication between microservices, as this can better leverage Kubernetes’ service discovery and load balancing functionalities.
