DockerCLI/docs/reference/commandline/logs.md

logs

Usage: docker logs [OPTIONS] CONTAINER

Fetch the logs of a container

  -f, --follow              Follow log output
  --help                    Print usage
  --since=""                Show logs since timestamp
  -t, --timestamps          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 --timestamps command will add an RFC3339Nano timestamp , for example 2014-09-16T06:17:46.000000000Z, to each log entry. To ensure that the timestamps 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). Besides RFC3339 date format you may also use RFC3339Nano, 2006-01-02T15:04:05, 2006-01-02T15:04:05.999999999, 2006-01-02Z07:00, and 2006-01-02. The local timezone on the client will be used if you do not provide either a Z or a +-00:00 timezone offset at the end of the timestamp. When providing Unix timestamps enter seconds[.nanoseconds], where seconds is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds (aka Unix epoch or Unix time), and the optional .nanoseconds field is a fraction of a second no more than nine digits long. You can combine the --since option with either or both of the --follow or --tail options.