84 lines
1.7 KiB
Markdown
84 lines
1.7 KiB
Markdown
# Logs
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Reading What's Happening
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{: .subtitle }
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By default, logs are written to stdout, in text format.
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## Configuration
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### General
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Traefik logs concern everything that happens to Traefik itself (startup, configuration, events, shutdown, and so on).
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#### `filePath`
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By default, the logs are written to the standard output.
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You can configure a file path instead using the `filePath` option.
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```toml tab="File (TOML)"
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# Writing Logs to a File
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[log]
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filePath = "/path/to/traefik.log"
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```
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```yaml tab="File (YAML)"
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# Writing Logs to a File
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log:
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filePath: "/path/to/traefik.log"
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```
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```bash tab="CLI"
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# Writing Logs to a File
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--log.filePath=/path/to/traefik.log
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```
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#### `format`
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By default, the logs use a text format (`common`), but you can also ask for the `json` format in the `format` option.
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```toml tab="File (TOML)"
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# Writing Logs to a File, in JSON
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[log]
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filePath = "/path/to/log-file.log"
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format = "json"
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```
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```yaml tab="File (YAML)"
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# Writing Logs to a File, in JSON
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log:
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filePath: "/path/to/log-file.log"
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format: json
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```
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```bash tab="CLI"
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# Writing Logs to a File, in JSON
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--log.filePath=/path/to/traefik.log
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--log.format=json
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```
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#### `level`
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By default, the `level` is set to `ERROR`. Alternative logging levels are `DEBUG`, `PANIC`, `FATAL`, `ERROR`, `WARN`, and `INFO`.
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```toml tab="File (TOML)"
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[log]
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level = "DEBUG"
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```
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```yaml tab="File (YAML)"
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log:
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level: DEBUG
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```
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```bash tab="CLI"
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--log.level=DEBUG
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```
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## Log Rotation
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Traefik will close and reopen its log files, assuming they're configured, on receipt of a USR1 signal.
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This allows the logs to be rotated and processed by an external program, such as `logrotate`.
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!!! warning
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This does not work on Windows due to the lack of USR signals.
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