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Chapter 5. Checking DNS records using IdM Healthcheck

This section describes a Healthcheck tool in Identity Management (IdM) to identify issues with DNS records.

5.1. DNS records healthcheck test

The Healthcheck tool includes a test for checking that the expected DNS records required for autodiscovery are resolvable.

To list all tests, run the ipa-healthcheck with the --list-sources option: 

# ipa-healthcheck --list-sources

The DNS records check test is placed under the ipahealthcheck.ipa.idns source.

IPADNSSystemRecordsCheck
This test checks the DNS records from the ipa dns-update-system-records --dry-run command using the first resolver specified in the /etc/resolv.conf file. The records are tested on the IPA server.

5.2. Screening DNS records using the healthcheck tool

This section describes a standalone manual test of DNS records on an Identity Management (IdM) server using the Healthcheck tool.

The Healthcheck tool includes many tests. Results can be narrowed down by including only the DNS records tests by adding the --source ipahealthcheck.ipa.idns option.

Prerequisites

  • Healthcheck tests must be performed as the root user.

Procedure

  • To run the DNS records check, enter: 

    # ipa-healthcheck --source ipahealthcheck.ipa.idns

    If the record is resolvable, the test returns SUCCESS as a result: 

    {
    "source": "ipahealthcheck.ipa.idns",
    "check": "IPADNSSystemRecordsCheck",
    "result": "SUCCESS",
    "uuid": "eb7a3b68-f6b2-4631-af01-798cac0eb018",
    "when": "20200415143339Z",
    "duration": "0.210471",
    "kw": {
      "key": "_ldap._tcp.idm.example.com.:server1.idm.example.com."
    }
}

    The test returns a WARNING when, for example, the number of records does not match the expected number: 

    {
    "source": "ipahealthcheck.ipa.idns",
    "check": "IPADNSSystemRecordsCheck",
    "result": "WARNING",
    "uuid": "972b7782-1616-48e0-bd5c-49a80c257895",
    "when": "20200409100614Z",
    "duration": "0.203049",
    "kw": {
      "msg": "Got {count} ipa-ca A records, expected {expected}",
      "count": 2,
      "expected": 1
    }
}

Additional resources

  • See man ipa-healthcheck.