github.com/vieux/docker@v0.6.3-0.20161004191708-e097c2a938c7/docs/reference/commandline/logs.md (about)

     1  <!--[metadata]>
     2  +++
     3  title = "logs"
     4  description = "The logs command description and usage"
     5  keywords = ["logs, retrieve, docker"]
     6  [menu.main]
     7  parent = "smn_cli"
     8  +++
     9  <![end-metadata]-->
    10  
    11  # logs
    12  
    13  ```markdown
    14  Usage:  docker logs [OPTIONS] CONTAINER
    15  
    16  Fetch the logs of a container
    17  
    18  Options:
    19        --details        Show extra details provided to logs
    20    -f, --follow         Follow log output
    21        --help           Print usage
    22        --since string   Show logs since timestamp
    23        --tail string    Number of lines to show from the end of the logs (default "all")
    24    -t, --timestamps     Show timestamps
    25  ```
    26  
    27  The `docker logs` command batch-retrieves logs present at the time of execution.
    28  
    29  > **Note**: this command is only functional for containers that are started with
    30  > the `json-file` or `journald` logging driver.
    31  
    32  For more information about selecting and configuring login-drivers, refer to
    33  [Configure logging drivers](../../admin/logging/overview.md).
    34  
    35  The `docker logs --follow` command will continue streaming the new output from
    36  the container's `STDOUT` and `STDERR`.
    37  
    38  Passing a negative number or a non-integer to `--tail` is invalid and the
    39  value is set to `all` in that case.
    40  
    41  The `docker logs --timestamps` command will add an [RFC3339Nano timestamp](https://golang.org/pkg/time/#pkg-constants)
    42  , for example `2014-09-16T06:17:46.000000000Z`, to each
    43  log entry. To ensure that the timestamps are aligned the
    44  nano-second part of the timestamp will be padded with zero when necessary.
    45  
    46  The `docker logs --details` command will add on extra attributes, such as
    47  environment variables and labels, provided to `--log-opt` when creating the
    48  container.
    49  
    50  The `--since` option shows only the container logs generated after
    51  a given date. You can specify the date as an RFC 3339 date, a UNIX
    52  timestamp, or a Go duration string (e.g. `1m30s`, `3h`). Besides RFC3339 date
    53  format you may also use RFC3339Nano, `2006-01-02T15:04:05`,
    54  `2006-01-02T15:04:05.999999999`, `2006-01-02Z07:00`, and `2006-01-02`. The local
    55  timezone on the client will be used if you do not provide either a `Z` or a
    56  `+-00:00` timezone offset at the end of the timestamp. When providing Unix
    57  timestamps enter seconds[.nanoseconds], where seconds is the number of seconds
    58  that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap
    59  seconds (aka Unix epoch or Unix time), and the optional .nanoseconds field is a
    60  fraction of a second no more than nine digits long. You can combine the
    61  `--since` option with either or both of the `--follow` or `--tail` options.