Service/cluster/routing discovery component

[kyessenov]

We need to provide an abstraction layer over the service network for the proxy configuration that can enumerate services and their IP endpoints and work cross-platform.

Although this information is not a user-provided intent but the platform-specific status, Manager should encapsulate this for Istio Proxy.

[rshriram]

This component should be capable of being run as a separate service or as part of the Manager Service. For proxies that fetch service information remotely (e.g., Envoy), this component would provide a generic discovery API. For proxies that cannot fetch such information at runtime (e.g., Nginx, Haproxy), this component would generate the static configuration file containing the IP addresses per service.

[kyessenov]

We should utilize SDS and/or CDS if the proxy provides this capability.
(see envoyproxy/envoy#144 (comment))

[rshriram]

Right. This is the API that needs to be exposed by this component.

On Wed, Dec 14, 2016 at 7:37 PM Kuat ***@***.***> wrote: We should utilize SDS and/or CDS if the proxy provides this capability. (see envoyproxy/envoy#144 (comment) <envoyproxy/envoy#144 (comment)>) — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#3 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AH0qdwAlVeJmMqlBgU3XIILlqWtAOptyks5rIIvTgaJpZM4LJfr8> .

-- ~shriram

[kyessenov]

#29 addresses service registration side.
I realized there is a complication with multi-port services while implementing this.
We probably need multiple clusters for each named port in a service.

[kyessenov]

#32 addresses the proxy static configuration.

[khgandhi]

@kyessenov is the service discovery component going to be part of the istio project that the envoy-istio proxy will be consuming ?

[kyessenov]

Yes, that's correct. There are three pieces: SDS, envoy/istio proxy talking to SDS, envoy/istio proxy agent (responsible for reloading configs).

[khgandhi]

Cool.. It would great if you could point me to any code/design documentation related to the SDS.