mirror of https://github.com/docker/cli.git
74 lines
3.5 KiB
Markdown
74 lines
3.5 KiB
Markdown
# logs
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<!---MARKER_GEN_START-->
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Fetch the logs of a container
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### Aliases
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`docker container logs`, `docker logs`
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### Options
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| Name | Type | Default | Description |
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|:---------------------|:---------|:--------|:---------------------------------------------------------------------------------------------------|
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| `--details` | | | Show extra details provided to logs |
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| `-f`, `--follow` | | | Follow log output |
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| `--since` | `string` | | Show logs since timestamp (e.g. `2013-01-02T13:23:37Z`) or relative (e.g. `42m` for 42 minutes) |
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| `-n`, `--tail` | `string` | `all` | Number of lines to show from the end of the logs |
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| `-t`, `--timestamps` | | | Show timestamps |
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| [`--until`](#until) | `string` | | Show logs before a timestamp (e.g. `2013-01-02T13:23:37Z`) or relative (e.g. `42m` for 42 minutes) |
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<!---MARKER_GEN_END-->
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## Description
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The `docker logs` command batch-retrieves logs present at the time of execution.
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For more information about selecting and configuring logging drivers, refer to
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[Configure logging drivers](https://docs.docker.com/config/containers/logging/configure/).
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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://pkg.go.dev/time#RFC3339Nano)
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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`, `2006-01-02T07:00`, 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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## Examples
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### <a name="until"></a> Retrieve logs until a specific point in time (--until)
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In order to retrieve logs before a specific point in time, run:
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```console
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$ docker run --name test -d busybox sh -c "while true; do $(echo date); sleep 1; done"
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$ date
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Tue 14 Nov 2017 16:40:00 CET
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$ docker logs -f --until=2s test
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Tue 14 Nov 2017 16:40:00 CET
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Tue 14 Nov 2017 16:40:01 CET
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Tue 14 Nov 2017 16:40:02 CET
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```
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