[core] Adding host tags via the -e flag does not work

[agamdua]

**Output of the info page **

====================
Collector (v 5.17.2)
====================

  Status date: 2017-11-30 19:46:20 (12s ago)
  Pid: 27
  Platform: Linux-4.4.0-1030-aws-x86_64-with-debian-8.9
  Python Version: 2.7.13, 64bit
  Logs: <stderr>, /var/log/datadog/collector.log

  Clocks
  ======

    NTP offset: 0.0032 s
    System UTC time: 2017-11-30 19:46:32.949955

  Paths
  =====

    conf.d: /etc/dd-agent/conf.d
    checks.d: /opt/datadog-agent/agent/checks.d

  Hostnames
  =========

    ec2-hostname: ip-10-0-114-178.ec2.internal
    local-ipv4: 10.0.114.178
    local-hostname: ip-10-0-114-178.ec2.internal
    hostname: web-ops-art-hut-rap
    socket-fqdn: 1acd0644f1e4
    agent-hostname: web-ops-art-hut-rap
    instance-id: i-0aa108455fb0da4b4

  Checks
  ======

    check_number_docker_containers (custom)
    ---------------------------------------
      - Collected 0 metrics, 0 events & 0 service checks

    check_deploy_state (custom)
    ---------------------------
      - Collected 0 metrics, 0 events & 0 service checks

    process (5.17.2)
    ----------------
      - instance #0 [OK]
      - instance #1 [OK]
      - Collected 34 metrics, 0 events & 2 service checks

    ntp (5.17.2)
    ------------
      - Collected 0 metrics, 0 events & 0 service checks

    disk (5.17.2)
    -------------
      - instance #0 [OK]
      - Collected 32 metrics, 0 events & 0 service checks

    docker_daemon (5.17.2)
    ----------------------
      - instance #0 [OK]
      - Collected 60 metrics, 0 events & 1 service check


  Emitters
  ========

    - http_emitter [OK]

2017-11-30 19:46:33,316 | WARNING | dd.dogstatsd | utils.service_discovery.config(config.py:31) | No configuration backend provided for service discovery. Only auto config templates will be used.
====================
Dogstatsd (v 5.17.2)
====================

  Status date: 2017-11-30 19:46:31 (2s ago)
  Pid: 21
  Platform: Linux-4.4.0-1030-aws-x86_64-with-debian-8.9
  Python Version: 2.7.13, 64bit
  Logs: <stderr>, /var/log/datadog/dogstatsd.log

  Flush count: 354
  Packet Count: 4605
  Packets per second: 2.0
  Metric count: 12
  Event count: 0
  Service check count: 0

====================
Forwarder (v 5.17.2)
====================

  Status date: 2017-11-30 19:46:31 (2s ago)
  Pid: 20
  Platform: Linux-4.4.0-1030-aws-x86_64-with-debian-8.9
  Python Version: 2.7.13, 64bit
  Logs: <stderr>, /var/log/datadog/forwarder.log

  Queue Size: 417 bytes
  Queue Length: 1
  Flush Count: 1194
  Transactions received: 896
  Transactions flushed: 895
  Transactions rejected: 0
  API Key Status: API Key is valid


======================
Trace Agent (v 5.17.2)
======================

  Pid: 19
  Uptime: 3548 seconds
  Mem alloc: 753584 bytes

  Hostname: web-ops-art-hut-rap
  Receiver: 0.0.0.0:8126
  API Endpoint: https://trace.agent.datadoghq.com

  Bytes sent (1 min): 0
  Traces sent (1 min): 0
  Stats sent (1 min): 0

Additional environment details (Operating System, Cloud provider, etc):

$ cat /etc/*-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.3 LTS"
NAME="Ubuntu"
VERSION="16.04.3 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.3 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

Steps to reproduce the issue:

1. run the docker container with -e TAGS=env:staging.

According to the docs:

TAGS set host tags. Add -e TAGS=simple-tag-0,tag-key-1:tag-value-1 to use [simple-tag-0, tag-key-1:tag-value-1] as host tags.

https://github.com/DataDog/docker-dd-agent#environment-variables

2. Check UI, and see that no additional tags have been set (definitely not env:staging).

It does show up in the container env vars though.

root@1acd0644f1e4:/# env | grep TAGS
TAGS=env:ops

3. Add the tag in the datadog.conf instead. Everything works as expected.

Describe the results you received:
Do not see env:staging in the host tags.

Describe the results you expected:
Should see env:staging in the host tags.

Additional information you deem important (e.g. issue happens only occasionally):

https://github.com/DataDog/docker-dd-agent/blob/12.3.5172/config_builder.py#L61-L63

[hkaj]

Hi @agamdua, thanks for reaching out.
Could you try with a more recent version of the agent? I can't reproduce with 5.20.1.
I'd also be interested in seeing the command you used to run the agent. Do you have a custom entrypoint? If you pass the env var, the default entrypoint should update datadog.conf.

[dmitrym0]

Howdy, I have a very similar issue with agent v 5.26.0.

The interesting thing is that some metrics do include my tags, and some don't.

Any tips?