Easy guide to Monitoring Puppet with Telegraf and MetricFire

Introduction 

Monitoring your Puppet runs and automation is essential for maintaining the performance, reliability, security, and compliance of your infrastructure. It allows you to stay ahead of potential issues, optimize resource utilization, and ensure a smooth and efficient operation of your database system. Implementing monitoring for your Puppet environment is a must for any DevOps team to ensure the stability, security, and performance of your infrastructure while facilitating efficient troubleshooting and maintenance.

In this article, we'll detail how to use the Telegraf agent to collect performance metrics from your Puppet Agent and forward them to a data source.

Getting Started with the Telegraf Agent

Telegraf is a plugin-driven server agent built on InfluxDB and can be used for collecting and sending metrics/events from databases, systems, devices, and a range of popular technologies. Telegraf is written in Go and compiles into a single binary with no external dependencies, and requires a very minimal memory footprint. It is compatible with many operating systems and has many useful output plugins and input plugins for collecting and forwarding a wide variety of performance metrics. 

Install Telegraf (Linux/Redhat)

wget https://dl.influxdata.com/telegraf/releases/telegraf_1.21.2-1_amd64.deb

sudo dpkg -i telegraf_1.21.2-1_amd64.deb

RedHat/CentOS

wget https://dl.influxdata.com/telegraf/releases/telegraf-1.21.4-1.x86_64.rpm

sudo yum localinstall telegraf-1.21.4-1.x86_64.rpm

Configure an Output

You can configure telegraf to output to a variety of sources, like Kafka, Graphite, InfluxDB, Prometheus, SQL, NoSQL, and more.

In this example, we will configure telegraf with a Graphite output. If you're not currently hosting your data source, you can start a 14-day free trial with Hosted Graphite by MetricFire to follow along with these next steps.

A Hosted Graphite account will provide the data source, include Hosted Grafana as a visualization tool, and offer an alerting feature.

To configure the Graphite output, you need to locate the downloaded telegraf configuration file at /etc/telegraf/telegraf.conf and open it in your preferred text editor. Then you will need to make the following changes to the file:

Locate and comment out the line:

# [[outputs.influxdb]]

Then, uncomment the line:

[[outputs.graphite]]

Next, uncomment and edit the server line to:

servers = ["carbon.hostedgraphite.com:2003"]

Finally, uncomment and edit the prefix line to:

prefix = "<YOUR_API_KEY>.telegraf"

Configure the Puppet Agent Input Plugin

Telegraf has many input plugins that can collect a wide range of data from many popular technologies and 3rd party sources. In this example, we'll demonstrate how to configure the Puppetagent plugin.

All you need to do is search for the inputs.puppet agent section in your telegraf.conf file, and uncomment the [[inputs.puppetagent]] line:

[[inputs.puppetagent]]

Then you can uncomment the 'location' line and configure it with the path of your 'puppet last run summary file', the default path is:

location = "/var/lib/puppet/state/last_run_summary.yaml"

Save your changes, and then start Telegraf using the following command, to see if there are any configuration errors in the output:

telegraf --config telegraf.conf

Telegraf will now be forwarding roughly 35 metrics per host/server to your data source, this is what they will look like in the Graphite format:

telegraf.<host>.<location>.puppetagent.changes_total
telegraf.<host>.<location>.puppetagent.events_failure
telegraf.<host>.<location>.puppetagent.events_noop
telegraf.<host>.<location>.puppetagent.events_success
telegraf.<host>.<location>.puppetagent.events_total
telegraf.<host>.<location>.puppetagent.resources_changed
telegraf.<host>.<location>.puppetagent.resources_correctivechange
telegraf.<host>.<location>.puppetagent.resources_failed
telegraf.<host>.<location>.puppetagent.resources_failedtorestart
telegraf.<host>.<location>.puppetagent.resources_outofsync
telegraf.<host>.<location>.puppetagent.resources_restarted
telegraf.<host>.<location>.puppetagent.resources_scheduled
telegraf.<host>.<location>.puppetagent.resources_skipped
telegraf.<host>.<location>.puppetagent.resources_total
telegraf.<host>.<location>.puppetagent.time_anchor
telegraf.<host>.<location>.puppetagent.time_catalogapplication
telegraf.<host>.<location>.puppetagent.time_configretrieval
telegraf.<host>.-<location>.puppetagent.time_convertcatalog
telegraf.<host>.<location>.puppetagent.time_cron
telegraf.<host>.<location>.puppetagent.time_exec
telegraf.<host>.<location>.puppetagent.time_factgeneration
telegraf.<host>.<location>.puppetagent.time_file
telegraf.<host>.<location>.puppetagent.time_filebucket
telegraf.<host>.<location>.puppetagent.time_group
telegraf.<host>.<location>.puppetagent.time_lastrun
telegraf.<host>.<location>.puppetagent.time_noderetrieval
telegraf.<host>.<location>.puppetagent.time_notify
telegraf.<host>.<location>.puppetagent.time_package
telegraf.<host>.<location>.puppetagent.time_pluginsync
telegraf.<host>.<location>.puppetagent.time_schedule
telegraf.<host>.<location>.puppetagent.time_service
telegraf.<host>.<location>.puppetagent.time_sshauthorizedkey
telegraf.<host>.<location>.puppetagent.time_total
telegraf.<host>.<location>.puppetagent.time_transactionevaluation
telegraf.<host>.<location>.puppetagent.time_user

See the official GitHub repository for more information and configuration options for the Puppetagent input plugin.

Use Hosted Graphite by MetricFire to Create Custom Dashboards and Alerts

MetricFire is a monitoring platform that enables you to gather, visualize, analyze, and alert on metrics from sources such as servers, databases, networks, devices, and applications. By utilizing MetricFire, you can effortlessly identify problems and optimize resources from within your infrastructure. Hosted Graphite by MetricFire takes away the burden of self-hosting your monitoring solution, allowing you more time and freedom to work on your most important tasks.

1. Once you have signed up for a Hosted Graphite account and used the above steps to configure your server with the Telegraf Agent, metrics will be forwarded, timestamped, ingested, and aggregated into the Hosted Graphite backend.
2. They will be sent and stored in the Graphite format of: metric.name.path <numeric-value> <unix-timestamp>, which provides a tree-like data structure and makes them easy to query.
3. You can locate these metrics in your Hosted Graphite account, and use them to build custom Alerts and Grafana dashboards.

Create Dashboards in Hosted Graphite's Hosted Grafana

In the Hosted Graphite UI, navigate to Dashboards => Primary Dashboards and select the + button to build a new panel:

Then you can use the query UI to select a graphite metric path (the default data source will be the hosted graphite backend if you are accessing Grafana through your Hosted Graphite account):

The Hosted Graphite datasource also supports wildcard (*) searches to grab all metrics that match a specified path.

Now you can apply Graphite functions to these metrics, like aliasByNode() to reformat the metric names on the graph and exclude() to remove a pattern from the query:

Grafana has many additional options like configuring dashboard variables and annotations. You can also use different visualizations, modify the display, set the units of measurement, and much more.

Hosted Graphite also has a pre-configured dashboard for Telegraf metrics located in their Dashboard Library:

Once this dashboard is generated in your account, you can locate it in your Primary Dashboards to see system metrics (CPU, mem, disk) displayed.

These system performance metrics come standard with a Telegraf => Graphite configuration:

See the Hosted Graphite dashboard docs for more details.

Creating Graphite Alerts

In the Hosted Graphite UI, navigate to Alerts => Graphite Alerts to create a new alert. Name the alert, add one of your graphite metrics to the alerting metric field, and add a description of what this alert is:

Then select the Criteria tab which will set the threshold, and select a notification channel. The default notification channel is the email you used to sign up for the Hosted Graphite account, but you can easily configure a channel for Slack, PagerDuty, Microsoft Teams, and more. See the Hosted Graphite docs for more details on notification channels:

Conclusion

Monitoring Puppet is essential for maintaining the health, performance, and security of your infrastructure, as well as for ensuring that configurations are applied correctly and consistently across your environment.

Using tools like dashboards and alerts complements this monitoring by providing real-time visualization, proactive identification of issues, historical trend analysis, and facilitating informed decision-making, all of which are essential for maintaining a robust and efficient network infrastructure.

Sign up for a free trial, and start monitoring your infrastructure today! You can also book a demo and talk to the MetricFire team directly about your monitoring needs.