github.com/AliyunContainerService/cli@v0.0.0-20181009023821-814ced4b30d0/docs/reference/commandline/logs.md (about)

     1  ---
     2  title: "logs"
     3  description: "The logs command description and usage"
     4  keywords: "logs, retrieve, docker"
     5  ---
     6  
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    15  
    16  # logs
    17  
    18  ```markdown
    19  Usage:  docker logs [OPTIONS] CONTAINER
    20  
    21  Fetch the logs of a container
    22  
    23  Options:
    24        --details        Show extra details provided to logs
    25    -f, --follow         Follow log output
    26        --help           Print usage
    27        --since string   Show logs since timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)
    28        --until string   Show logs before timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)
    29        --tail string    Number of lines to show from the end of the logs (default "all")
    30    -t, --timestamps     Show timestamps
    31  ```
    32  
    33  ## Description
    34  
    35  The `docker logs` command batch-retrieves logs present at the time of execution.
    36  
    37  > **Note**: this command is only functional for containers that are started with
    38  > the `json-file` or `journald` logging driver.
    39  
    40  For more information about selecting and configuring logging drivers, refer to
    41  [Configure logging drivers](https://docs.docker.com/config/containers/logging/configure/).
    42  
    43  The `docker logs --follow` command will continue streaming the new output from
    44  the container's `STDOUT` and `STDERR`.
    45  
    46  Passing a negative number or a non-integer to `--tail` is invalid and the
    47  value is set to `all` in that case.
    48  
    49  The `docker logs --timestamps` command will add an [RFC3339Nano timestamp](https://golang.org/pkg/time/#pkg-constants)
    50  , for example `2014-09-16T06:17:46.000000000Z`, to each
    51  log entry. To ensure that the timestamps are aligned the
    52  nano-second part of the timestamp will be padded with zero when necessary.
    53  
    54  The `docker logs --details` command will add on extra attributes, such as
    55  environment variables and labels, provided to `--log-opt` when creating the
    56  container.
    57  
    58  The `--since` option shows only the container logs generated after
    59  a given date. You can specify the date as an RFC 3339 date, a UNIX
    60  timestamp, or a Go duration string (e.g. `1m30s`, `3h`). Besides RFC3339 date
    61  format you may also use RFC3339Nano, `2006-01-02T15:04:05`,
    62  `2006-01-02T15:04:05.999999999`, `2006-01-02Z07:00`, and `2006-01-02`. The local
    63  timezone on the client will be used if you do not provide either a `Z` or a
    64  `+-00:00` timezone offset at the end of the timestamp. When providing Unix
    65  timestamps enter seconds[.nanoseconds], where seconds is the number of seconds
    66  that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap
    67  seconds (aka Unix epoch or Unix time), and the optional .nanoseconds field is a
    68  fraction of a second no more than nine digits long. You can combine the
    69  `--since` option with either or both of the `--follow` or `--tail` options.
    70  
    71  ## Examples
    72  
    73  ### Retrieve logs until a specific point in time
    74  
    75  In order to retrieve logs before a specific point in time, run:
    76  
    77  ```bash
    78  $ docker run --name test -d busybox sh -c "while true; do $(echo date); sleep 1; done"
    79  $ date
    80  Tue 14 Nov 2017 16:40:00 CET
    81  $ docker logs -f --until=2s
    82  Tue 14 Nov 2017 16:40:00 CET
    83  Tue 14 Nov 2017 16:40:01 CET
    84  Tue 14 Nov 2017 16:40:02 CET
    85  ```