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plugin/geoip: Add GLSB example (#5795)

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* add glsb example

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
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Chris O'Haver 2022-12-07 06:27:23 -05:00 • committed by GitHub
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plugin/geoip/README.md
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@ -66,6 +66,27 @@ The following configuration configures the `City` database, and looks up geoloca
}
```
The *view* plugin can use *geoip* metadata as selection criteria to provide GSLB functionality.
In this example, clients from the city "Exampleshire" will receive answers for `example.com` from the zone defined in
`example.com.exampleshire-db`. All other clients will receive answers from the zone defined in `example.com.db`.
Note that the order of the two `example.com` server blocks below is important; the default viewless server block
must be last.
```txt
example.com {
view exampleshire {
expr metadata('geoip/city/name') == 'Exampleshire'
}
geoip /opt/geoip2/db/GeoLite2-City.mmdb
metadata
file example.com.exampleshire-db
}
example.com {
file example.com.db
}
```
## Metadata Labels
A limited set of fields will be exported as labels, all values are stored using strings **regardless of their underlying value type**, and therefore you may have to convert it back to its original type, note that numeric values are always represented in base 10.