DockerCLI/docs/reference/commandline/logs.md

logs

Usage: docker logs [OPTIONS] CONTAINER

Fetch the logs of a container

  -f, --follow=false        Follow log output
  --help=false              Print usage
  --since=""                Show logs since timestamp
  -t, --timestamps=false    Show timestamps
  --tail="all"              Number of lines to show from the end of the logs

Note: this command is available only for containers with json-file and journald logging drivers.

The docker logs command batch-retrieves logs present at the time of execution.

The docker logs --follow command will continue streaming the new output from the container's STDOUT and STDERR.

Passing a negative number or a non-integer to --tail is invalid and the value is set to all in that case.

The docker logs --timestamp commands will add an RFC3339Nano timestamp , for example 2014-09-16T06:17:46.000000000Z, to each log entry. To ensure that the timestamps for are aligned the nano-second part of the timestamp will be padded with zero when necessary.

The --since option shows only the container logs generated after a given date. You can specify the date as an RFC 3339 date, a UNIX timestamp, or a Go duration string (e.g. 1m30s, 3h). Docker computes the date relative to the client machine’s time. You can combine the --since option with either or both of the --follow or --tail options.