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System component logs record events happening in cluster, which can be very useful for debugging.
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You can configure log verbosity to see more or less detail.
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Logs can be as coarse-grained as showing errors within a component, or as fine-grained as showing step-by-step traces of events (like HTTP access logs, pod state changes, controller actions, or scheduler decisions).
Migration to structured log messages is an ongoing process. Not all log messages are structured in this version. When parsing log files, you must also handle unstructured log messages.
Log formatting and value serialization are subject to change.
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ログの形式と値のシリアライズは変更される可能性があります。
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{{< /warning>}}
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Structured logging introduces a uniform structure in log messages allowing for programmatic extraction of information. You can store and process structured logs with less effort and cost.
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New message format is backward compatible and enabled by default.
JSON output does not support many standard klog flags. For list of unsupported klog flags, see the [Command line tool reference](/docs/reference/command-line-tools-reference/).
Not all logs are guaranteed to be written in JSON format (for example, during process start). If you intend to parse logs, make sure you can handle log lines that are not JSON as well.
The `--experimental-logging-sanitization` flag enables the klog sanitization filter.
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If enabled all log arguments are inspected for fields tagged as sensitive data (e.g. passwords, keys, tokens) and logging of these fields will be prevented.
The `-v` flag controls log verbosity. Increasing the value increases the number of logged events. Decreasing the value decreases the number of logged events.
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Increasing verbosity settings logs increasingly less severe events. A verbosity setting of 0 logs only critical events.
*Read about the [Kubernetes Logging Architecture](/docs/concepts/cluster-administration/logging/)
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*Read about [Structured Logging](https://github.com/kubernetes/enhancements/tree/master/keps/sig-instrumentation/1602-structured-logging)
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*Read about the [Conventions for logging severity](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-instrumentation/logging.md)
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