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58 lines
1.6 KiB
58 lines
1.6 KiB
# DNS
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The Domain Name System (DNS) is a naming system for computers or other resources
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connected to a network.
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It associates various information with domain names.
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## Software suites for DNS interaction
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The following list shows possible DNS software suites that can be used to set
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up a DNS server.
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- [Bind](./bind.md) is a open source package for setting up DNS
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## Records
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### A record
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A (address) records map hostnames to an IP.
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Its basic structure is:
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```txt
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name. A IP
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```
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Where `name` is the domain to map the `IP` to and `A` is the constant for
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the type of the record.
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### CNAME record
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CNAME (canonical name) records map one domain name to another.
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Its basic structure is:
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```txt
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name. CNAME value.
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```
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Where `name` is the domain to map the `value` (another domain) to and `CNAME` is
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the constant for the type of the record.
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### SRV record
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Service (SRV) records define the port and hostname for specified services.
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Its basic structure is:
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```txt
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_service._proto.name. TTL class SRV priority weight port target
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```
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Where `_service` is the service name, `_proto` is the used protocoll (TCP/UDP),
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`name` is the domain name to assign to, `TTL` is the DNS time to live, `class`
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always is `IN`, `SRV` is the constant for the type of the record, `priority` is
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the priority of the target host, `weight` is the relative weight for records
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with the same priority, `port` is the port on that the service can be found and
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`target` is the canonical hostname of the server.
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Note that you need to create an A if you bind a service to a `name` that doesn't
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already have one.
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