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Chapter 5. Checking DNS records using IdM Healthcheck


You can identify issues with DNS records in Identity Management (IdM) using the Healthcheck tool.

Prerequisites

  • The DNS records Healthcheck tool is only available on RHEL 8.2 or newer.

5.1. DNS records healthcheck test

The Healthcheck tool includes the IPADNSSystemRecordsCheck test for checking that the expected DNS records required for autodiscovery are resolvable. Specifically, the test checks the DNS records obtained by the ipa dns-update-system-records --dry-run command using the first resolver specified in the /etc/resolv.conf file on the IdM server to which you are logged in.

You can find the IPADNSSystemRecordsCheck test under the ipahealthcheck.ipa.idns source of the output of the ipa-healthcheck --list-sources command.

5.2. Screening IdM DNS records using the Healthcheck tool

Follow this procedure to run 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

  • You have root privileges.

Procedure

  • Enter:

    # ipa-healthcheck --source ipahealthcheck.ipa.idns
    • The --source ipahealthcheck.ipa.idns option ensures that IdM Healthcheck only performs the DNS records test.

      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
        }
    }
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