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https://github.com/vulcand/vulcand

Programmatic load balancer backed by Etcd
https://github.com/vulcand/vulcand

Last synced: 30 days ago
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Programmatic load balancer backed by Etcd

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README 

        
Vulcand

=======



Vulcand is a programmatic extendable proxy for microservices and API management.

It is inspired by [Hystrix](https://github.com/Netflix/Hystrix) and powers Mailgun microservices infrastructure.



Focus and priorities

--------------------

Vulcand is focused on microservices and API use-cases.



Features

--------



* Uses etcd as a configuration backend.

* API and command line tool.

* Pluggable middlewares.

* Support for canary deployments, realtime metrics and resilience.



![Vulcan diagram](https://coreos.com/assets/images/media/vulcan-1-upstream.png "Vulcan diagram")



Project info

------------



| documentation | https://vulcand.github.io/                                   |

| :------------- |:-----------------------------------------------------------------|

| status        | Used in production@Mailgun on moderate workloads.  Under active development.              |

| discussions   | https://groups.google.com/d/forum/vulcan-proxy                  |

| roadmap       | [roadmap.md](ROADMAP.md)                  |

| build status  | [![Build Status](https://travis-ci.org/vulcand/vulcand.svg?branch=master)](https://travis-ci.org/vulcand/vulcand) |



Opentracing Support

------------

Vulcand has support for open tracing via the [Jaeger client

libraries](https://github.com/jaegertracing/jaeger-client-go). Users who wish

to use tracing support should use the `--enableJaegerTracing` flag and must

either run the Jaeger client listening on `localhost:6831/udp` or set the

environment variables `JAEGER_AGENT_HOST` and `JAEGER_AGENT_POST`. (See the

[Jaeger client libraries](https://github.com/jaegertracing/jaeger-client-go)

for all available configuration environment variables.)



When enabled vulcand will create 2 spans: one span called `vulcand` which

covers the entire downstream request and another span called `middleware` which

only spans the processing of the middleware before the request is routed

downstream.



Aliased Expressions

------------

When running vulcand in a kubernetes DaemonSet vulcand needs to know requests

from the local node can match `Host("localhost")` rules. This `--aliases` flag

allows an author of a vulcand DaemonSet to tell vulcand the name of the node it's

currently running on, such that vulcand correctly routes requests for

`Host("localhost")`. The `--aliases` flag allows the user to pass in multiple

aliases separated by commas.



Example

```

$ vulcand --aliases 'Host("localhost")=Host("192.168.1.1")'

```