如何从Docker控制流利的日志标签 [英] How to control fluentd log tag from Docker

问题描述

当前设置正在使用fluentd驱动程序运行Docker容器:

Current setup is running Docker containers with the fluentd driver:

docker run --log-driver=fluentd my-container

这很容易...将标准输出发送到主机上本地运行的fluentd系统.

That works quite easily...sends stdout to the locally running fluentd system on the host.

我想使用容器上设置的一些标签来控制流畅的tag.对于此示例，假定一些标签(docker inspect代码段):

I'd like to control the fluentd tag using some of the labels which are set on the container. For this example, assume some labels (docker inspect snippet):

"Config": {
    "Labels": {
       "com.amazonaws.ecs.container-name": "web",
       "com.amazonaws.ecs.task-definition-version": "3"
    }
}

如何通过提取一个或多个Labels来设置fluentd tag?

How can I set the fluentd tag by extracting out one or more of the Labels?

此Docker文档列出了当前支持的标签: https://docs .docker.com/engine/admin/logging/log_tags/

The Docker docs on this list out the currently supported tags: https://docs.docker.com/engine/admin/logging/log_tags/

那些文档记录了ExtraAttributes ...但是，我可以弄清楚如何使用它来查找一个或多个标签.阅读Docker代码对我来说还不清楚: https: //github.com/docker/docker/blob/master/daemon/logger/context.go#L29

Those docs make note of ExtraAttributes...however I can figure out how to use that to look up one or more labels. Reading through the Docker code it's not clear to me: https://github.com/docker/docker/blob/master/daemon/logger/context.go#L29

这与docker inspect无关紧要:

docker inspect --format '{{index .ContainerLabels "com.amazonaws.ecs.container-name"}}'

我想提取相同的信息并将其放入log-opt tag=?

I'd like to grep out the same information and get it into log-opt tag=?

推荐答案

ContainerLabels地图是

The ContainerLabels map is one of the items available in dockers logging Context and the fluentd driver supports ParseLogTag so you can use go template formatting.

在直接泊坞窗中，这看起来像:

In straight docker this would look like:

docker run \
  --label alabel=1value \
  --log-driver=fluentd \
  --log-opt tag="{{ .ContainerLabels.alabel }}" \
  busybox \
  echo "$(date) test log"

因此，如果您可以按以下方式将--log-opt注入到ECS启动中:

So if you can inject a --log-opt into your ECS startup as follows:

--log-opt tag='{{ index .ContainerLabels "com.amazonaws.ecs.container-name" }}' 

您应该获得标签.

index具有非字母数字字符的键

index is required here to access map keys with non alpha numeric characters

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