StatsD update to docker-scout

May 22 Bullet_white By Mark Bullet_white Posted in Updates, HowTo Bullet_white Comments Comments

We've all been exploring Docker lately, and back in March, we published Monitoring Docker with docker-scout with how to get started with Scout and Docker.

statsd

Today, we are excited to announce that we updated this container to include StatsD. Just like in our previous post, Rails App Monitoring (APM) with StatsD, we've made StatsD ridiculously easy to setup. Simply add the scout-docker container to your existing infrastructure and quickly start working with StatsD across all your containers. Here's how it works:

Implementation

1Create a configuration file

Create a file called scoutd.yml (or copy our template). Your account_key is required, all other values are optional. For a list of options, see our scoutd help page.

account_key: YOUR_SCOUT_ACCOUNT_KEY

2Run the docker image

Run the scout image, mounting the scoutd.yml file. Running the image will first download the image, if it is not already locally available. Run the following command in the directory containing your scoutd.yml file:

docker run -d --name scout-agent \
    -v /proc:/host/proc:ro \
    -v /etc/mtab:/host/etc/mtab:ro \
    -v /var/run/docker.sock:/host/var/run/docker.sock:ro \
    -v `pwd`/scoutd.yml:/etc/scout/scoutd.yml \
    --net=host --privileged scoutapp/docker-scout

Full docker-scout docs are on our help site.

3Testing

First, log into the scout-agent container via this command:

 docker exec -it scout-agent /bin/bash

Next, let's send some foo to our StatsD instance.

 echo "foo:1|c" | nc -u -w0 172.17.42.1 8125

Repeat that command a few times, just to make sure we're reporting lots of foo. Jump over to your Scout account and you'll see foo as a custom metric in your docker host server page.

4Other Containers

Sending metrics from inside the scout-docker container proves basic functionality - but the rubber really hits the road when we can start sending StatsD metrics from other containers.

We're going to take advantage of the IP address that Docker uses internally to communication between containers. The default scoutd.yaml file is already setup to handle this.

Next, log into one of your other containers, and send this command a few times:

 echo "bar:1|c" | nc -u -w0 172.17.42.1 8125

Give it a minute or so and there's our bar metric ready for action!

Note: For any existing containers that are already using StatsD, you'll have to update their StatsD IP address to point to the scoutd aggregator at 172.17.42.1.

As with any metric in Scout, you can now setup triggers (to generate alerts) on these new custom metrics. Our previous post had a great example if you need a quick refresher.

Conclusion

As you can tell, we think StatsD is awesome! We're having a lot of fun seeing where it can be used and how we can provide more value to our customers.

With one simple docker run command, and minimal configuration, we've been able to add powerful, customizable metrics to any existing Docker infrastructure.

Questions? Shoot us an email at support@scoutapp.com or open an issue. Full help documentation is available on our help site.

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