3.5 KiB
logs
Fetch the logs of a container
Aliases
docker container logs, docker logs
Options
| Name | Type | Default | Description |
|---|---|---|---|
--details |
Show extra details provided to logs | ||
-f, --follow |
Follow log output | ||
--since |
string |
Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes) |
|
-n, --tail |
string |
all |
Number of lines to show from the end of the logs |
-t, --timestamps |
Show timestamps | ||
--until |
string |
Show logs before a timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes) |
Description
The docker logs command batch-retrieves logs present at the time of execution.
For more information about selecting and configuring logging drivers, refer to Configure logging drivers.
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 docker logs --details command will add on extra attributes, such as
environment variables and labels, provided to --log-opt when creating the
container.
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.
Examples
Retrieve logs until a specific point in time (--until)
In order to retrieve logs before a specific point in time, run:
$ docker run --name test -d busybox sh -c "while true; do $(echo date); sleep 1; done"
$ date
Tue 14 Nov 2017 16:40:00 CET
$ docker logs -f --until=2s test
Tue 14 Nov 2017 16:40:00 CET
Tue 14 Nov 2017 16:40:01 CET
Tue 14 Nov 2017 16:40:02 CET