skywalking/docs/en/setup/backend/backend-ip-port.md

IP and port setting

Backend is using IP and port binding, in order to support the OS having multiple IPs. The binding/listening IP and port are specified by core module

core:
  default:
    restHost: 0.0.0.0
    restPort: 12800
    restContextPath: /
    gRPCHost: 0.0.0.0
    gRPCPort: 11800

There are two IP/port pair for gRPC and HTTP rest services.

• Most agents and probes use gRPC service for better performance and code readability.
• Few agent use rest service, because gRPC may be not supported in that language.
• UI uses rest service, but data in GraphQL format, always.

Notice

IP binding

In case some users are not familiar with IP binding, you should know, after you did that, the client could only use this IP to access the service. Such as binding 172.09.13.28, even you are in this machine, must use this IP rather than 127.0.0.1 or localhost to access the service.

Module provider specified IP and port

The IP and port in core are only default provided by core. But some module provider may provide other IP and port settings, this is common. Such as many receiver modules provide this.