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QRadar: Validate /etc/hosts file

Question & Answer


How to verify whether the hosts file is accurate?


Over the life of your QRadar environment the /etc/hosts file can grow with:
  • Duplicate entries after hardware migrations
  • Duplicate or incorrect entries after host readds after an IP change or hostname change
  • Obsolete entries
  • Hardware rebuilds, or VM rebuilds, causing incorrect hashes


Validate /etc/hosts file and /etc/hosts.default on host:
  • Are there any duplicate IP addresses?
  • Is there any IP present that was decommissioned?
  • Is the host short name on the same line with the IP address?
  • Is the host fully qualified domain name (FQDN) on the same line with the IP address?
  • If high availability (HA) is in use, is the primary, secondary, and VIP present?
  • Are default values present, for loopback for example:     localhost.localdomain localhost localhost4.localdomain4 localhost4
    ::1           localhost6.localdomain6 localhost6 localhost.localdomain localhost
  • Is the hash present for the Console, usually at the end of the Console's VIP address:    conosle.local console a1a1aaaa1a11a111
    Note: If you see it missing or suspect it to be incorrect, validate the hash.

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Document Information

Modified date:
23 June 2023