mirror of https://github.com/docker/docs.git
chore: tier 1 freshness: content/config/containers/logging/fluentd.md
Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>
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David Karlsson
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---
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description: Describes how to use the fluentd logging driver.
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description: Learn how to use the fluentd logging driver
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keywords: Fluentd, docker, logging, driver
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title: Fluentd logging driver
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aliases:
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- /engine/reference/logging/fluentd/
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- /reference/logging/fluentd/
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- /engine/admin/logging/fluentd/
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- /engine/reference/logging/fluentd/
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- /reference/logging/fluentd/
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- /engine/admin/logging/fluentd/
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---
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The `fluentd` logging driver sends container logs to the
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@ -18,40 +18,38 @@ In addition to the log message itself, the `fluentd` log
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driver sends the following metadata in the structured log message:
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| Field | Description |
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|:-----------------|:-------------------------------------------------------------------------------------------------------------------------------------------------------|
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| :--------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `container_id` | The full 64-character container ID. |
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| `container_name` | The container name at the time it was started. If you use `docker rename` to rename a container, the new name is not reflected in the journal entries. |
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| `container_name` | The container name at the time it was started. If you use `docker rename` to rename a container, the new name isn't reflected in the journal entries. |
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| `source` | `stdout` or `stderr` |
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| `log` | The container log |
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The `docker logs` command is not available for this logging driver.
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The `docker logs` command isn't available for this logging driver.
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## Usage
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Some options are supported by specifying `--log-opt` as many times as needed:
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- `fluentd-address`: specify a socket address to connect to the Fluentd daemon, ex `fluentdhost:24224` or `unix:///path/to/fluentd.sock`
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- `tag`: specify a tag for fluentd message, which interprets some markup, ex `{{.ID}}`, `{{.FullID}}` or `{{.Name}}` `docker.{{.ID}}`
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- `fluentd-address`: specify a socket address to connect to the Fluentd daemon, ex `fluentdhost:24224` or `unix:///path/to/fluentd.sock`.
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- `tag`: specify a tag for Fluentd messages. Supports some Go template markup, ex `{{.ID}}`, `{{.FullID}}` or `{{.Name}}` `docker.{{.ID}}`.
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To use the `fluentd` driver as the default logging driver, set the `log-driver`
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and `log-opt` keys to appropriate values in the `daemon.json` file, which is
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located in `/etc/docker/` on Linux hosts or
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`C:\ProgramData\docker\config\daemon.json` on Windows Server. For more about
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+configuring Docker using `daemon.json`, see
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+[daemon.json](../../../engine/reference/commandline/dockerd.md#daemon-configuration-file).
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To use the `fluentd` driver as the default logging driver, set the `log-driver`
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and `log-opt` keys to appropriate values in the `daemon.json` file, which is
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located in `/etc/docker/` on Linux hosts or
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`C:\ProgramData\docker\config\daemon.json` on Windows Server. For more about
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configuring Docker using `daemon.json`, see [daemon.json](../../../engine/reference/commandline/dockerd.md#daemon-configuration-file).
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The following example sets the log driver to `fluentd` and sets the
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`fluentd-address` option.
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```json
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{
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```json
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{
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"log-driver": "fluentd",
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"log-opts": {
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"fluentd-address": "fluentdhost:24224"
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}
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}
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```
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}
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```
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Restart Docker for the changes to take effect.
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@ -65,13 +63,17 @@ Restart Docker for the changes to take effect.
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To set the logging driver for a specific container, pass the
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`--log-driver` option to `docker run`:
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docker run --log-driver=fluentd ...
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```text
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docker run --log-driver=fluentd ...
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```
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Before using this logging driver, launch a Fluentd daemon. The logging driver
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connects to this daemon through `localhost:24224` by default. Use the
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`fluentd-address` option to connect to a different address.
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docker run --log-driver=fluentd --log-opt fluentd-address=fluentdhost:24224
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```text
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docker run --log-driver=fluentd --log-opt fluentd-address=fluentdhost:24224
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```
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If container cannot connect to the Fluentd daemon, the container stops
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immediately unless the `fluentd-async` option is used.
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@ -97,7 +99,6 @@ By default, Docker uses the first 12 characters of the container ID to tag log m
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Refer to the [log tag option documentation](log_tags.md) for customizing
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the log tag format.
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### labels, labels-regex, env, and env-regex
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The `labels` and `env` options each take a comma-separated list of keys. If
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@ -128,7 +129,7 @@ How long to wait between retries. Defaults to 1 second.
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### fluentd-max-retries
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The maximum number of retries. Defaults to `4294967295` (2**32 - 1).
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The maximum number of retries. Defaults to `4294967295` (2\*\*32 - 1).
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### fluentd-sub-second-precision
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@ -150,6 +151,7 @@ aggregate store.
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1. Write a configuration file (`test.conf`) to dump input logs:
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```none
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<source>
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@type forward
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</source>
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@ -157,11 +159,16 @@ aggregate store.
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<match *>
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@type stdout
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</match>
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```none
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2. Launch Fluentd container with this configuration file:
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```none
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$ docker run -it -p 24224:24224 -v /path/to/conf/test.conf:/fluentd/etc/test.conf -e FLUENTD_CONF=test.conf fluent/fluentd:latest
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```
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3. Start one or more containers with the `fluentd` logging driver:
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```none
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$ docker run --log-driver=fluentd your/application
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```
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