53 lines
1.6 KiB
Markdown
53 lines
1.6 KiB
Markdown
# Setting Override
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SkyWalking backend supports setting overrides by system properties and system environment variables.
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You could override the settings in `application.yml`
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## System properties key rule
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**ModuleName**.**ProviderName**.**SettingKey**.
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- Example
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Override `restHost` in this setting segment
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```yaml
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core:
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default:
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restHost: ${SW_CORE_REST_HOST:0.0.0.0}
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restPort: ${SW_CORE_REST_PORT:12800}
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restContextPath: ${SW_CORE_REST_CONTEXT_PATH:/}
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gRPCHost: ${SW_CORE_GRPC_HOST:0.0.0.0}
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gRPCPort: ${SW_CORE_GRPC_PORT:11800}
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```
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Use command arg
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```
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-Dcore.default.restHost=172.0.4.12
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```
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## System environment variables
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- Example
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Override `restHost` in this setting segment through environment variables
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```yaml
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core:
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default:
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restHost: ${REST_HOST:0.0.0.0}
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restPort: ${SW_CORE_REST_PORT:12800}
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restContextPath: ${SW_CORE_REST_CONTEXT_PATH:/}
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gRPCHost: ${SW_CORE_GRPC_HOST:0.0.0.0}
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gRPCPort: ${SW_CORE_GRPC_PORT:11800}
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```
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If the `REST_HOST ` environment variable exists in your operating system and its value is `172.0.4.12`,
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then the value of `restHost` here will be overwritten to `172.0.4.12`, otherwise, it will be set to `0.0.0.0`.
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By the way, Placeholder nesting is also supported, like `${REST_HOST:${ANOTHER_REST_HOST:127.0.0.1}}`.
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In this case, if the `REST_HOST ` environment variable not exists, but the ```REST_ANOTHER_REST_HOSTHOST```
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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`,
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otherwise, it will be set to `127.0.0.1`.
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