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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>
55 lines
2.3 KiB
Markdown
55 lines
2.3 KiB
Markdown
<!--[metadata]>
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+++
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title = "logs"
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description = "The logs command description and usage"
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keywords = ["logs, retrieve, docker"]
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[menu.main]
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parent = "smn_cli"
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+++
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<![end-metadata]-->
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# logs
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Usage: docker logs [OPTIONS] CONTAINER
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Fetch the logs of a container
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--details Show extra details provided to logs
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-f, --follow Follow log output
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--help Print usage
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--since="" Show logs since timestamp
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-t, --timestamps Show timestamps
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--tail="all" Number of lines to show from the end of the logs
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> **Note**: this command is available only for containers with `json-file` and
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> `journald` logging drivers.
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The `docker logs` command batch-retrieves logs present at the time of execution.
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The `docker logs --follow` command will continue streaming the new output from
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the container's `STDOUT` and `STDERR`.
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Passing a negative number or a non-integer to `--tail` is invalid and the
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value is set to `all` in that case.
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The `docker logs --timestamps` command will add an [RFC3339Nano timestamp](https://golang.org/pkg/time/#pkg-constants)
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, for example `2014-09-16T06:17:46.000000000Z`, to each
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log entry. To ensure that the timestamps are aligned the
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nano-second part of the timestamp will be padded with zero when necessary.
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The `docker logs --details` command will add on extra attributes, such as
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environment variables and labels, provided to `--log-opt` when creating the
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container.
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The `--since` option shows only the container logs generated after
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a given date. You can specify the date as an RFC 3339 date, a UNIX
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timestamp, or a Go duration string (e.g. `1m30s`, `3h`). Besides RFC3339 date
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format you may also use RFC3339Nano, `2006-01-02T15:04:05`,
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`2006-01-02T15:04:05.999999999`, `2006-01-02Z07:00`, and `2006-01-02`. The local
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timezone on the client will be used if you do not provide either a `Z` or a
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`+-00:00` timezone offset at the end of the timestamp. When providing Unix
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timestamps enter seconds[.nanoseconds], where seconds is the number of seconds
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that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap
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seconds (aka Unix epoch or Unix time), and the optional .nanoseconds field is a
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fraction of a second no more than nine digits long. You can combine the
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`--since` option with either or both of the `--follow` or `--tail` options.
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