Using this article, you will learn how to setup / configure Caching-Only DNS with BIND on RHEL/CENTOS 7.6. As we know, DNS is used for translating names into IP addresses and IP addresses into names. DNS servers come in various types (Master, Slave, Caching, and Forwarding). The topic we are going to cover is Caching-Only DNS servers. Caching-Only DNS Server is also referred to as DNS Resolver.
Once a DNS Cache Server contacts the remote DNS server, and then caches (locally) the address returned from the query with the stipulated time allowed by the records ‘TTL value, so the subsequent time if any request goes to the equal URL address, it instantly returns the answer, besides having to contact your ISP’s DNS server to ask it for the translation. This process is much faster because it does not have to connect to any remote servers each time.
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