# logs

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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`](#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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## 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](https://docs.docker.com/config/containers/logging/configure/).

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](https://golang.org/pkg/time/#pkg-constants)
, 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

### <a name="until"></a> Retrieve logs until a specific point in time (--until)

In order to retrieve logs before a specific point in time, run:

```console
$ 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
```
