dnscache

DNS

Improve DNS lookup speed on your mail server by using a DNS cache.

As part of delivering email and filtering spam, this mail server is going to be doing a lot of DNS lookups. In order to improve the performance of those lookups, we're going to install a DNS cache locally on this machine.

Installation Instructions

Technology:

dnscache

As part of delivering email and filtering spam, this mail server is going to be doing a lot of DNS lookups. In order to improve the performance of those lookups, we're going to install a DNS cache on this machine.

Set up dnscache
dnscache is a recursive nameserver. If it receives a query that it doesn't know the answer for, it will consult other nameservers on the Internet. It caches that answer so the next time it's queried, it doesn't have to go looking again.

While no security holes have been found yet in djbdns, we'll create two non-root users that are limited to running the dnscache programs:

useradd -M -d /nohome -s /bin/false dnsrun
useradd -M -d /nohome -s /bin/false dnslog

Create the directory to hold the cache service:

Technology:

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