Programmatic load balancer backed by Etcd
Vulcand is a programmatic extendable proxy for microservices and API management. It is inspired by Hystrix and powers Mailgun microservices infrastructure.
Vulcand is focused on microservices and API use-cases.
Vulcand has support for open tracing via the Jaeger client
libraries. 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
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.
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")'
Still under active developemt?
How to implement a plugin to modify the response?
codahale/hdrhistogram repo url has been transferred under the github HdrHstogram umbrella
Which version of etcd is supported?
New release
Keep docs along with code
Share TLS session cache between multiple vulcand instances
TCP load balancing support
Seal key cannot be rotated
Dependency on mailgun/manners