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88 lines
3.2 KiB
Markdown
88 lines
3.2 KiB
Markdown
---
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name: D_EXTEND
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parameters:
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- name
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- modifiers...
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---
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`D_EXTEND` adds records (and metadata) to a domain previously defined
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by `D()`. It can also be used to add subdomain records (and metadata)
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to a previously defined domain.
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The first argument is a domain name. If it exactly matches a
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previously defined domain, `D_EXTEND()` behaves the same as `D()`,
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simply adding records as if they had been specified in the original
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`D()`.
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If the domain name does not match an existing domain, but could be a
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(non-delegated) subdomain of an existing domain, the new records (and
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metadata) are added with the subdomain part appended to all record
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names (labels), and targets (as appropriate). See the examples below.
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Matching the domain name to previously-defined domains is done using a
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`longest match` algorithm. If `domain.tld` and `sub.domain.tld` are
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defined as separate domains via separate `D()` statements, then
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`D_EXTEND('sub.sub.domain.tld', ...)` would match `sub.domain.tld`,
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not `domain.tld`.
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Some operators only act on an apex domain (e.g.
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`CF_REDIRECT` and `CF_TEMP_REDIRECT`). Using them
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in a `D_EXTEND` subdomain may not be what you expect.
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Example:
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{% include startExample.html %}
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{% highlight js %}
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D("domain.tld", REG, DnsProvider(DNS),
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A("@", "127.0.0.1"), // domain.tld
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A("www", "127.0.0.2"), // www.domain.tld
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CNAME("a", "b") // a.domain.tld -> b.domain.tld
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);
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D_EXTEND("domain.tld",
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A("aaa", "127.0.0.3"), // aaa.domain.tld
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CNAME("c", "d") // c.domain.tld -> d.domain.tld
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);
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D_EXTEND("sub.domain.tld",
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A("bbb", "127.0.0.4"), // bbb.sub.domain.tld
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A("ccc", "127.0.0.5"), // ccc.sub.domain.tld
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CNAME("e", "f") // e.sub.domain.tld -> f.sub.domain.tld
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);
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D_EXTEND("sub.sub.domain.tld",
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A("ddd", "127.0.0.6"), // ddd.sub.sub.domain.tld
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CNAME("g", "h") // g.sub.sub.domain.tld -> h.sub.sub.domain.tld
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);
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D_EXTEND("sub.domain.tld",
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A("@", "127.0.0.7"), // sub.domain.tld
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CNAME("i", "j") // i.sub.domain.tld -> j.sub.domain.tld
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);
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{%endhighlight%}
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This will end up in the following modifications:
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```
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******************** Domain: domain.tld
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----- Getting nameservers from: cloudflare
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----- DNS Provider: cloudflare...7 corrections
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#1: CREATE A aaa.domain.tld 127.0.0.3
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#2: CREATE A bbb.sub.domain.tld 127.0.0.4
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#3: CREATE A ccc.sub.domain.tld 127.0.0.5
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#4: CREATE A ddd.sub.sub.domain.tld 127.0.0.6
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#5: CREATE A sub.domain.tld 127.0.0.7
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#6: CREATE A www.domain.tld 127.0.0.2
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#7: CREATE A domain.tld 127.0.0.1
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#8: CREATE CNAME a.domain.tld b.domain.tld.
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#9: CREATE CNAME c.domain.tld d.domain.tld.
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#10: CREATE CNAME e.sub.domain.tld f.sub.domain.tld.
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#11: CREATE CNAME g.sub.sub.domain.tld h.sub.sub.domain.tld.
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#12: CREATE CNAME i.sub.domain.tld j.sub.domain.tld.
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```
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{% include endExample.html %}
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ProTips: `D_EXTEND()` permits you to create very complex and
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sophisticated configurations, but you shouldn't. Be nice to the next
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person that edits the file, who may not be as expert as yourself.
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Enhance readability by putting any `D_EXTEND()` statements immediately
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after the original `D()`, like in above example. Avoid the temptation
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to obscure the addition of records to existing domains with randomly
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placed `D_EXTEND()` statements. Don't build up a domain using loops of
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`D_EXTEND()` statements. You'll be glad you didn't.
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