docker logs

docker logs command is used to fetch the logs of a container.

Syntax

$ docker logs [OPTIONS] CONTAINER

Note: This command only works for the containers that are started with the json-file or journald logging driver.

--details → Show extra details provided to logs
--follow, -f → Follow the log output
--since → Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)
--tail , -n → Number of lines to show from the end of the logs
--timestamps , -t → Show timestamps
--until → Show logs before a timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)

$ docker run --name test -d busybox sh -c "while true; do $(echo date); sleep 1; done"
$ date

Tue 5 Jul 2022 15:56:25 UTC+5:45

Here, this command when executed successfully, dates are echoed continuously after every 1 second.

$ docker logs -f --until=2s test

Tue 5 Jul 2022 15:57:15 UTC+5:45
Tue 5 Jul 2022 15:57:16 UTC+5:45
Tue 5 Jul 2022 15:57:17 UTC+5:45