Setting Override

SkyWalking backend supports setting overrides by system properties and system environment variables. You may override the settings in application.yml

System properties key rule

ModuleName.ProviderName.SettingKey.

  • Example

    Override restHost in this setting segment

core:
  default:
    restHost: ${SW_CORE_REST_HOST:0.0.0.0}
    restPort: ${SW_CORE_REST_PORT:12800}
    restContextPath: ${SW_CORE_REST_CONTEXT_PATH:/}
    gRPCHost: ${SW_CORE_GRPC_HOST:0.0.0.0}
    gRPCPort: ${SW_CORE_GRPC_PORT:11800}

Use command arg

-Dcore.default.restHost=172.0.4.12

System environment variables

  • Example

    Override restHost in this setting segment through environment variables

core:
  default:
    restHost: ${REST_HOST:0.0.0.0}
    restPort: ${SW_CORE_REST_PORT:12800}
    restContextPath: ${SW_CORE_REST_CONTEXT_PATH:/}
    gRPCHost: ${SW_CORE_GRPC_HOST:0.0.0.0}
    gRPCPort: ${SW_CORE_GRPC_PORT:11800}

If the REST_HOST environment variable exists in your operating system and its value is 172.0.4.12, then the value of restHost here will be overwritten to 172.0.4.12; otherwise, it will be set to 0.0.0.0.

Placeholder nesting is also supported, like ${REST_HOST:${ANOTHER_REST_HOST:127.0.0.1}}. In this case, if the REST_HOST environment variable does not exist, but the REST_ANOTHER_REST_HOSTHOST environment variable exists and its value is 172.0.4.12, then the value of restHost here will be overwritten to 172.0.4.12; otherwise, it will be set to 127.0.0.1.