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fluentd日志记录驱动程序发送容器日志到 Fluentd 集电极结构化日志数据。然后，用户可以使用 Fluentd 的各种输出插件将这些日志写入各个目标。
除了日志消息本身之外，fluentd日志驱动程序还会在结构化日志消息中发送以下元数据：
领域（范畴） | 描述 |
|---|---|
container_id | 完整的64个字符的容器 ID。 |
container_name | 容器名称在启动时。如果使用 docker rename 重命名容器，则新名称不会反映在日记帐分录中。 |
source | stdout 或 stderr |
docker logs命令不适用于此日志记录驱动程序。
用法
通过根据需要指定--log-opt多次来支持一些选项：
fluentd-address：指定一个套接字地址来连接到 Fluentd 守护进程，exfluentdhost:24224或unix:///path/to/fluentd.sock
tag：指定 fluentd 消息的标签，其解释一些标记，ex{{.ID}}，{{.FullID}}或{{.Name}}docker.{{.ID}}
要将fluentd驱动程序用作默认日志记录驱动程序，请将该键log-driver和log-opt键设置daemon.json为位于/etc/docker/Linux 主机或C:\ProgramData\docker\config\daemon.jsonWindows Server 上的文件中的适当值。有关+使用 Docker 配置的更多信息daemon.json，请参阅+ daemon.json。
以下示例将日志驱动程序设置为fluentd并设置fluentd-address选项。
{ "log-driver": "fluentd", "log-opts": { "fluentd-address": "fluentdhost:24224" } }重新启动 Docker 以使更改生效。
要为特定容器设置日志记录驱动程序，请将--log-driver选项传递给docker run：
docker run --log-driver=fluentd ...
在使用此日志记录驱动程序之前，请启动 Fluentd 守护进程。日志记录驱动程序localhost:24224默认连接到此守护程序。使用该fluentd-address选项连接到不同的地址。
docker run --log-driver=fluentd --log-opt fluentd-address=fluentdhost:24224
如果容器无法连接到 Fluentd 守护进程，则容器将立即停止，除非使用该fluentd-async-connect选项。
选项
用户可以使用该--log-opt NAME=VALUE标志来指定其他 Fluentd 日志记录驱动程序选项。
fluentd 地址
默认情况下，日志记录驱动程序连接到localhost:24224。提供fluentd-address连接到不同地址的选项。支持tcp（默认）和unix套接字。
docker run --log-driver=fluentd --log-opt fluentd-address=fluentdhost:24224docker run --log-driver=fluentd --log-opt fluentd-address=tcp://fluentdhost:24224docker run --log-driver=fluentd --log-opt fluentd-address=unix:///path/to/fluentd.sock
以上两项指定了相同的地址，因为它tcp是默认的。
标签
默认情况下，Docker 使用容器 ID 的前12个字符来标记日志消息。请参阅日志标记选项文档以定制日志标记格式。
标签，env 和 env-regex
在labels和env选项各取一个逗号分隔的密钥列表。如果label和env键之间存在冲突，env则优先。这两个选项都将附加字段添加到日志消息的额外属性中。
env-regex选项类似于并兼容env。它的值是一个正则表达式来匹配与日志相关的环境变量。它用于高级日志标记选项。
fluentd-异步连接
Docker 在后台连接到 Fluentd。消息被缓存直到连接建立。
fluentd - 缓冲 - 限制
刷新到磁盘之前要缓冲的数据量。默认为容器可用的 RAM 数量。
fluentd - 重试 - 等待
重试之间需要等待多长时间。默认为1秒。
fluentd-MAX-重试
最大重试次数。默认为10。
使用 Docker 的 Fluentd 守护进程管理
关于Fluentd本身，看到 项目的网页 和 其文件。
要使用此日志记录驱动程序，请在主机上启动fluentd守护程序。我们建议您使用Fluentd泊坞窗图像。如果要在每台主机上聚合多个容器日志，则此图像特别有用，然后将日志传输到另一个 Fluentd 节点以创建聚合存储。
测试容器记录器
1. 写一个配置文件（test.conf）来转储输入日志：<type> @type forward </ source> <match \ *> @type stdout </ match>
2. 使用此配置文件启动 Fluentd 容器：
$ docker run -it -p 24224：24224 -v /path/to/conf/test.conf:/fluentd/etc/test.conf -e FLUENTD_CONF = test.conf fluent / fluentd：latest
3. 使用fluentd日志记录驱动程序启动一个或多个容器：
$ docker run --log-driver=fluentd your/application