bd9d14a07b
The jsonlog logger currently allows specifying envs and labels that should be propagated to the log message, however there has been no way to read that back. This adds a new API option to enable inserting these attrs back to the log reader. With timestamps, this looks like so: ``` 92016-04-08T15:28:09.835913720Z foo=bar,hello=world hello ``` The extra attrs are comma separated before the log message but after timestamps. Without timestaps it looks like so: ``` foo=bar,hello=world hello ``` Signed-off-by: Brian Goff <cpuguy83@gmail.com>
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% DOCKER(1) Docker User Manuals % Docker Community % JUNE 2014
NAME
docker-logs - Fetch the logs of a container
SYNOPSIS
docker logs [-f|--follow] [--help] [--since[=SINCE]] [-t|--timestamps] [--tail[="all"]] CONTAINER
DESCRIPTION
The docker logs command batch-retrieves whatever logs are present for a container at the time of execution. This does not guarantee execution order when combined with a docker run (i.e., your run may not have generated any logs at the time you execute docker logs).
The docker logs --follow command combines commands docker logs and docker attach. It will first return all logs from the beginning and then continue streaming new output from the container’s stdout and stderr.
Warning: This command works only for the json-file or journald logging drivers.
OPTIONS
--help Print usage statement
--details=true|false Show extra details provided to logs
-f, --follow=true|false Follow log output. The default is false.
--since="" Show logs since timestamp
-t, --timestamps=true|false Show timestamps. The default is false.
--tail="all" Output the specified number of lines at the end of logs (defaults to all logs)
The --since option can be Unix timestamps, date formatted timestamps, or Go
duration strings (e.g. 10m, 1h30m) computed relative to the client machine’s
time. Supported formats for date formatted time stamps include RFC3339Nano,
RFC3339, 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.
The docker logs --details command will add on extra attributes, such as
environment variables and labels, provided to --log-opt when creating the
container.
HISTORY
April 2014, Originally compiled by William Henry (whenry at redhat dot com) based on docker.com source material and internal work. June 2014, updated by Sven Dowideit SvenDowideit@home.org.au July 2014, updated by Sven Dowideit SvenDowideit@home.org.au April 2015, updated by Ahmet Alp Balkan ahmetalpbalkan@gmail.com October 2015, updated by Mike Brown mikebrow@gmail.com