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Documentation Grafana Loki Clients Promtail Stages docker

docker stage

The docker stage is a parsing stage that reads log lines in the standard format of Docker log files.

Schema

yaml Copy

docker: {}

Unlike most stages, the docker stage provides no configuration options and only supports the specific Docker log format. Each log line from Docker is written as JSON with the following keys:

1. log: The content of log line
2. stream: Either stdout or stderr
3. time: The timestamp string of the log line

Examples

For the given pipeline:

yaml Copy

- docker: {}

Given the following log line:

Copy

{"log":"log message\n","stream":"stderr","time":"2019-04-30T02:12:41.8443515Z"}

The following key-value pairs would be created in the set of extracted data:

• output: log message\n
• stream: stderr
• timestamp: 2019-04-30T02:12:41.8443515