Setting Override

SkyWalking backend supports setting overrides by system properties and system environment variables. You could 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.

By the way, Placeholder nesting is also supported, like ${REST_HOST:${ANOTHER_REST_HOST:127.0.0.1}}. In this case, if the REST_HOST environment variable not exists, 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.