How to add originating docker host name to fluentd log output

[Traiano Welcome]

Hi

I've set up fluentd logging from docker to a fluentd aggregator, which then sends the log to elasticsearch. Looking at the resulting logs in Kibana, I can see the docker log entry, but I can't see the originating host of the container, which makes it difficult to troubleshoot in a hurry on a large cluster.

How would I configure fluentd to add the docker host address and name to the docker logs sent to fluentd-server?

My current log output looks like this:

{
  "_index": "fluentd-20180607",
  "_type": "access_log",
  "_id": "SDKSLDFFNFSF",
  "_version": 1,
  "_score": null,
  "_source": {
    "source": "stdout",
    "log": "2018-06-07 10:09:35,693 marathon_lb: adding virtual host for app with id /prometheus/nodex",
    "container_id": "dc6b9dff667d77250f9597eda750a06d771f5e34139774a23efb884835db0923",
    "container_name": "/mesos-86625275-9f89-4f6a-9561-064c746687ce-S4.f50690d0-7b7b-427b-b40f-f9b8d26f990a",
    "@timestamp": "2018-06-07T10:09:35.000000000+00:00",
    "@log_name": "docker.dc6b9dff667d"
  },
  "fields": {
    "@timestamp": [
      1528366175000
    ]
  },
  "sort": [
    1528366175000
  ]
}

My fluentd source configuration block looks like this:

  <source>
    @type forward
    tag      docker.**
    port {{ fluentd_collector_docker_log_port }}
    bind {{ fluentd_collector_bind_address }}
    @label @mainstream
  </source>

Thanks in advance for any help!

Traiano

[Mr. Fiber]

Try https://docs.fluentd.org/v1.0/articles/in_forward#source_hostname_key

Masahiro

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[Traiano Welcome]

On Fri, Jun 8, 2018 at 2:42 PM, Mr. Fiber <repea...@gmail.com> wrote:

Try https://docs.fluentd.org/v1.0/articles/in_forward#source_hostname_key

Thanks, Masahiro,that worked a treat!