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Thursday, 3 March 2016

Datadog Agent

The Datadog Agent faithfully collects events and metrics and brings them to Datadog on your behalf so that you can do something useful with your monitoring and performance data.

You're looking at the source code right now. We provide a number of pre-packaged binaries for your convenience.

If you want to submit code, please fork this repository and submit pull requests against the master branch. For more information, please read our contributing guidelines.

Please note that the Agent is licensed for simplicity's sake under a simplified BSD license, as indicated in the LICENSE file. Exceptions are marked with LICENSE-xxx where xxx is the component name. If you do not agree with the licensing terms and wish to contribute code nonetheless, please email us at before submitting your pull request.

Setup your environment


python 2.6 or 2.7

# Clone the repository
git clone

# Create a virtual environment and install the dependencies:
cd dd-agent
bundle install
rake setup_env

# Activate the virtual environment
source venv/bin/activate

# Lint
bundle exec rake lint

# Run a flavored test
bundle exec rake ci:run[apache]
Test suite

More about how to write tests and run them here

How to configure the Agent
If you are using packages on linux, the main configuration file lives in /etc/dd-agent/datadog.conf. Per-check configuration files are in /etc/dd-agent/conf.d. We provide an example in the same directory that you can use as a template.

Datadog Agent

proxy configuration

Why Use a Proxy

If your network configuration restricted outbound traffic, you can proxy all agent traffic through one or several hosts that have more permissive outbound policies.
You have a few options to send traffic to Datadog over SSL/TLS for hosts that are not directly connected to the internet.
  1. Using the agent as a proxy (for up to 16 agents per proxy)
  2. Using a web proxy (e.g. Squid, Microsoft Web Proxy) that is already deployed in your network
  3. Using HAProxy (if you want to proxy more than 16-20 agents through the same proxy)

Step-by-step Guides

Using the Agent as a Proxy

  1. Designate one node that runs datadog-agent as the proxy. In this example assume that the proxy name is proxy-node. This node must be able to reach
  2. Verify SSL connectivity on proxy-node
    curl -v 2>&1 | grep "200 OK"
  3. Allow non-local traffic on proxy-node by changing the following line in /etc/dd-agent/datadog.conf# non_local_traffic: no should read non_local_traffic: yes.
  4. Make sure proxy-node can be reached from the other nodes over port 17123. Start the agent on the proxy-node and run on the other nodes:
    curl -v http://proxy-node:17123/status 2>&1 | grep "200 OK"
  5. Update non-proxy nodes to forward to proxy-node. Simply change the following line in /etc/dd-agent/datadog.conf from:
    dd_url: to dd_url: http://proxy-node:17123
  6. Verify on the Infrastructure page that all nodes report data to Datadog.

Using a Web Proxy as Proxy

Traditional web proxies are supported natively by the agent. Simply edit datadog.conf with your proxy information.
# If you need a proxy to connect to the Internet, provide the settings here
proxy_port: 3128
proxy_user: my_user
proxy_password: my_password
Do not forget to restart the agent for the new settings to take effect.

Using HAProxy as a Proxy

HAProxy is a free, very fast and reliable solution offering proxying for TCP and HTTP applications. While HAProxy is usually used as a load balancer to distribute incoming requests to pools servers, you can also use it to proxy agent traffic to Datadog from hosts that have no outside connectivity.
This is the best option if you do not have a web proxy readily available in your network and you wish to proxy a large number of agents.
agent ---> haproxy ---> Datadog
We assume that HAProxy is installed on a host that has connectivity to Datadog. You can use the following configuration file if you do not already have it configured.
# Basic configuration
    log local0
    maxconn 4096
    stats socket /tmp/haproxy

# Some sane defaults
    log     global
    option  dontlognull
    retries 3
    option  redispatch
    timeout client 1s
    timeout server 5s
    timeout connect 5s

# This declares a view into HAProxy statistics, on port 3835
# You do not need credentials to view this page and you can
# turn it off once you are done with setup.
listen stats :3835
    mode http
    stats enable
    stats uri /

# This declares the endpoint where your agents will connect.
# In this example we use port 3834 but you can use any other
# free port.
frontend forwarder
    bind *:3834 # DTDG
    mode tcp
    default_backend datadog

# This is the Datadog server. In effect any TCP request coming
# to the forwarder frontend defined above will be proxied to
# Datadog's public endpoints.
backend datadog
    balance roundrobin
    mode tcp
    option tcplog
    server mothership check port 80
Once the HAProxy configuration is in place, you can reload it or restart HAProxy.
We recommend having a cron job that reloads HAProxy 10 minutes (usually doing something like service haproxy reload) to force a refresh of HAProxy's DNS cache, in case fails over to another IP.
Then edit each agent to point to HAProxy by setting its dd_url to the address of HAProxy (e.g. This dd_url setting can be found in datadog.conf.
Before you restart the agent you will need to edit your supervisor configuration to disable SSL certificate verification. This is needed to prevent python from complaining about the discrepancy between the hostname on the SSL certificate ( and your HAProxy hostname.

On GNU/Linux, Mac OS X, FreeBSD, SmartOS:

You need to edit the supervisor configuration found at:
  • /etc/dd-agent/supervisor_ddagent.conf on debian-based systems
  • /etc/dd-agent/supervisor.conf on redhat-based systems
  • /opt/local/datadog/supervisord/supervisord.conf on SmartOS
  • /usr/local/etc/datadog/supervisord/supervisord.conf on FreeBSD
  • ~/.datadog-agent/supervisord/supervisord.conf on Mac OS X
Assuming that file is found at SUP_FILE
sed -i 's/ --sslcheck=0/' SUP_FILE

On Windows (Starting from agent 3.9.2):

You need to edit your configuration file (datadog.conf) and add this option:
skip_ssl_validation: yes
Finally restart the agent.
To verify that everything is working properly, you can review the HAProxy statistics at as well as the Infrastructure Overview.