Logging environment variable configuration
Environment variables available to the Nacelle process change the behavior of the loggers when using the bootstrapper.
| Environment Variable | Default | Description |
|---|---|---|
| LOG_COLORIZE | true | Colorize log messages by level when true. Works with console encoding only. |
| LOG_JSON_FIELD_NAMES | A JSON-encoded map to rename the fields for message, timestamp, and/or level. | |
| LOG_DISPLAY_FIELDS | true | Omit log fields from output when false. Works with console encoding only. |
| LOG_DISPLAY_MULTILINE_FIELDS | false | Print fields on one line when true, one field per line when false. Works with console encoding only. |
| LOG_ENCODING | console | console for human-readable output and json for JSON-formatted output. |
| LOG_FIELD_BLACKLIST | A JSON-encoded list of fields to omit from logs. Works with console encoding only. | |
| LOG_FIELDS | A JSON-encoded map of fields to include in every log. | |
| LOG_LEVEL | info | The highest level that will be emitted. |
| LOG_SHORT_TIME | false | Omit date from timestamp when true. Works with console encoding only. |
Examples
Example output when using the default configuration:
[I] [2019/07/24 09:15:30.806] Accepted request from 68.6.165.7 caller=derision/main.go:20 requestId=12341234-1234-1234-1234-123412341234 sequenceNumber=2
Example output when using LOG_ENCODING=json:
{"caller":"derision/main.go:20","level":"info","message":"Accepted request from 68.6.165.7","requestId":"12341234-1234-1234-1234-123412341234","sequenceNumber":2,"timestamp":"2019-07-24T09:16:55.673-0700"}
Example output when using LOG_DISPLAY_FIELDS=false:
[I] [2019/07/24 09:15:49.517] Accepted request from 68.6.165.7
Example output when using LOG_SHORT_TIME=true:
[I] [09:17:56] Accepted request from 68.6.165.7 caller=derision/main.go:20 requestId=12341234-1234-1234-1234-123412341234 sequenceNumber=2
Example output when using LOG_DISPLAY_MULTILINE_FIELDS=true:
[I] [2019/07/24 09:16:38.117] Accepted request from 68.6.165.7
caller = derision/main.go:20
requestId = 12341234-1234-1234-1234-123412341234
sequenceNumber = 2