Best practice for DNS caching in RHEL

Solution Verified - Updated 2023-07-14T13:24:39+00:00 -

English

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Environment

• Red Hat Enterprise Linux
• bind
• unbound
• dnsmasq
• NSCD (May be removed in later releases of RHEL)

Technology Preview

• systemd-resolved (RHEL 8, 9)

Issue

• How to configure DNS cache in RHEL ?
• How to cache DNS query in RHEL ?

Resolution

• bind, unbound, dnsmasq, NSCD OR systemd-resolved can be configured to cache DNS queries in RHEL systems.
• How to configure DNS caching server with bind in RHEL
• How to configure DNS caching server with unbound in RHEL
• How to configure DNS caching server with dnsmasq in RHEL
• How to configure nscd for naming resolution?

Note: systemd-resolved is provided as Technology Preview in RHEL 8, 9

• Is systemd-resolved available and supported on RHEL 8 or RHEL 9? (present also how to configure and enable it)
• Technology Preview Features Support Scope

Root Cause

• By default, RHEL does not cache DNS queries.

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