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85 lines
3.4 KiB
Markdown
85 lines
3.4 KiB
Markdown
---
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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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---
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<!-- This file is maintained within the docker/cli GitHub
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repository at https://github.com/docker/cli/. Make all
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pull requests against that repo. If you see this file in
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another repository, consider it read-only there, as it will
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periodically be overwritten by the definitive file. Pull
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requests which include edits to this file in other repositories
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will be rejected.
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-->
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# logs
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```markdown
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Usage: docker logs [OPTIONS] CONTAINER
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Fetch the logs of a container
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Options:
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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 string Show logs since timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)
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--until string Show logs before timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)
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--tail string Number of lines to show from the end of the logs (default "all")
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-t, --timestamps Show timestamps
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```
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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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> **Note**: this command is only functional for containers that are started with
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> the `json-file` or `journald` logging driver.
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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://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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## Examples
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### Retrieve logs until a specific point in time
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In order to retrieve logs before a specific point in time, run:
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```bash
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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
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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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``` |