This repo contains a Datadog agent check to monitor FreeRADIUS. The check will publish one service check to Datadog, called freeradius. It also records a number of custom metrics about what the FreeRADIUS process is doing.

Prerequisites:

• A working installation of FreeRADIUS.
• radclient installed on the server that will be running the custom check. (On Ubuntu, at least, this is installed with the FreeRADIUS server.)

To install:

1. Configure a status server on your FreeRADIUS installation.
2. Configure the Datadog Agent to collect stats (assuming the agent is already installed):
   1. Copy freeradius.py to /etc/datadog-agent/checks.d/.
   2. Copy freeradius.yaml to /etc/datadog-agent/conf.d/ and customize for your implementation. Each instance must have a host, port and secret. You can also optionally include a type of 1, 2, 4, 8, corresponding to the FreeRADIUS-Statistics-Type parameter. If you don't include a type, all four types will be queried (warning, this will create quite a few custom metrics).
   3. Restart the datadog-agent service.

• freeradius.response_time: gauge, response time of the status request, in seconds. If you don't include a type, the check will make four status requests, and this will be the mean response time of all requests.
• Type 1: Authentication Counters
  • freeradius.access.requests
  • freeradius.access.accepts
  • freeradius.access.rejects
  • freeradius.access.challenges
  • freeradius.auth.responses
  • freeradius.auth.duplicate.requests
  • freeradius.auth.malformed.requests
  • freeradius.auth.invalid.requests
  • freeradius.auth.dropped.requests
  • freeradius.auth.unknown.types
• Type 2: Accounting Counters
  • freeradius.accounting.requests
  • freeradius.accounting.responses
  • freeradius.acct.duplicate.requests
  • freeradius.acct.malformed.requests
  • freeradius.acct.invalid.requests
  • freeradius.acct.dropped.requests
  • freeradius.acct.unknown.types
• Type 4: Proxy Authentication Counters
  • freeradius.proxy.access.requests
  • freeradius.proxy.access.accepts
  • freeradius.proxy.access.rejects
  • freeradius.proxy.access.challenges
  • freeradius.proxy.auth.responses
  • freeradius.proxy.auth.duplicate.requests
  • freeradius.proxy.auth.malformed.requests
  • freeradius.proxy.auth.invalid.requests
  • freeradius.proxy.auth.dropped.requests
  • freeradius.proxy.auth.unknown.types
• Type 8: Proxy Accounting Counters
  • freeradius.proxy.accounting.requests
  • freeradius.proxy.accounting.responses
  • freeradius.proxy.acct.duplicate.requests
  • freeradius.proxy.acct.malformed.requests
  • freeradius.proxy.acct.invalid.requests
  • freeradius.proxy.acct.dropped.requests
  • freeradius.proxy.acct.unknown.types

Except for freeradius.response_time, all metrics are monotonic counters that will reset when the freeradius process restarts.