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# Uplinks
An *upnlink* is a link with an external registry that provides acccess to external packages.
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### Usage
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```yaml
uplinks:
npmjs:
url: https://registry.npmjs.org/
server2:
url: http://mirror.local.net/
timeout: 100ms
server3:
url: http://mirror2.local.net:9000/
baduplink:
url: http://localhost:55666/
```
### Configuration
You can define mutiple uplinks and each of them must have an unique name (key). They can have two properties:
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Property | Type | Required | Example | Support | Description | Default
--- | --- | --- | --- | --- | --- | ---
url | string | Yes | https://registry.npmjs.org/ | all | The registry url |
timeout | string | No | 100ms | all | set new timeout for the request | 30s
maxage | string | No |10m | all | limit maximun failure request | 2m
fail_timeout | string | No |10m | all | defines max time when a request becomes a failure | 5m
max_fails | number | No |2 | all | limit maximun failure request | 2
cache | boolean | No |[true,false] | >= 2.1 | avoid cache tarballs | true
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### You Must know
* Uplinks must be registries compatible with the `npm` endpoints. Eg: *verdaccio* , *sinopia@1.4.0* , *npmjs registry* , *yarn registry* and more.
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* Setting `cache` to false will help to save space in your hard drive.
* Exceed with multiple uplinks might slow down the lookup of your packages due for each request a npm client does, verdaccio does 1 call for each uplink.
* The (timeout, maxage and fail_timeout) format follow the [NGINX measurement units ](http://nginx.org/en/docs/syntax.html )
