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74 lines
2.3 KiB
Markdown
74 lines
2.3 KiB
Markdown
---
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name: IMPORT_TRANSFORM
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parameters:
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- transform table
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- domain
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- modifiers...
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---
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Don't use this feature. It was added for a very specific situation at Stack Overflow.
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`IMPORT_TRANSFORM` adds to the domain all the records from another
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domain, after making certain transformations and resetting the TTL.
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Example:
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Suppose foo.com is a regular domain. bar.com is a regular domain,
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but certain records should be the same as foo.com with these
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exceptions: "bar.com" is added to the name, the TTL is changed to
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300, if the IP address is between 1.2.3.10 and 1.2.3.20 then rewrite
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the IP address to be based on 123.123.123.100 (i.e. .113 or .114).
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You wouldn't want to maintain bar.com manually, would you? It would
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be very error prone. Therefore instead you maintain foo.com and
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let `IMPORT_TRANSFORM` automatically generate bar.com.
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{% capture example %}
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```text
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foo.com:
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one.foo.com. IN A 1.2.3.1
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two.foo.com. IN A 1.2.3.2
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three.foo.com. IN A 1.2.3.13
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four.foo.com. IN A 1.2.3.14
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bar.com:
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www.bar.com. IN 123.123.123.123
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one.foo.com.bar.com. IN A 1.2.3.1
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two.foo.com.bar.com. IN A 1.2.3.2
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three.foo.com.bar.com. IN A 123.123.123.113
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four.foo.com.bar.com. IN A 123.123.123.114
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```
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{% endcapture %}
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{% include example.html content=example %}
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Here's how you'd implement this in DNSControl:
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{% capture example %}
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```js
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var TRANSFORM_INT = [
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// RANGE_START, RANGE_END, NEW_BASE
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{ low: "1.2.3.10", high: "1.2.3.20", newBase: "123.123.123.100" }, // .10 to .20 rewritten as 123.123.123.100+IP
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{ low: "2.4.6.80", high: "2.4.6.90", newBase: "123.123.123.200" }, // Another rule, just to show that you can have many.
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]
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D("foo.com", .... ,
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A("one","1.2.3.1")
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A("two","1.2.3.2")
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A("three","1.2.3.13")
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A("four","1.2.3.14")
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);
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D("bar.com", .... ,
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A("www","123.123.123.123")
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IMPORT_TRANSFORM(TRANSFORM_INT, 'foo.com', 300),
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);
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```
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{% endcapture %}
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{% include example.html content=example %}
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Transform rules are: RANGE_START, RANGE_END, NEW_BASE. NEW_BASE may be:
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* An IP address. Rebase the IP address on this IP address. Extract the host part of the /24 and add it to the "new base" address.
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* A list of IP addresses. For each A record, inject an A record for each item in the list: `newBase: ['1.2.3.100', '2.4.6.8.100']` would produce 2 records for each A record.
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