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Configuring Docker for Production

Logging

Default Logging

By default, Docker logging uses the JSON file driver and will store an unlimited amount of log messages, which can quickly consume all space on your Docker hosts.

As a precaution and best practice, set the Docker logging options to a certain maximum file size and number of files.

Edit or create /etc/docker/daemon.json and specify:

{
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  }
}

That allows up to 100MB of logs per container. Adjust as appropriate given the number target of containers per host and the desired log retention.

Centralized Logging

Alternatively, use a consolidated logging platform and use any one of the available Docker logging drivers, such as:

  • syslog
  • fluentd
  • splunk