Envoy

Question 1

OSI layers

Answer 1

https://pasteboard.co/JDwJk2b.png

Question 2

Terminology - What is a Host?

Answer 2

An entity capable of network communication.

Question 3

Terminology - What is a Downstream?

Answer 3

Downstream host connects to enoy, sends requests and receives responses.

Question 4

Terminology - What is a Upstream?

Answer 4

Upstream receives connections and requests from Envoy and returns responses.

Question 5

Terminology - What is a Listener?

Answer 5

Listener is a named network location which will receive downstream connections.

Question 6

Terminology - What is a Cluster?

Answer 6

A group of logically similar upstream hosts that envoy connects to.

Question 7

Terminology - What is a Mesh?

Answer 7

A group of hosts that coordinate to provide a consistent network topology.

Question 8

Terminology - What is a Envoy Mesh?

Answer 8

A group of Envoy proxies that form a message passing substrate for distributed systems.

Question 9

Terminology - What is a Runtime Configuration?

Answer 9

Realtime configuration system deployed alongside Envoy.

Question 10

How does the threading model looks like on Envoy?

Answer 10

A single process with multiple worker threads. Envoy is written to be non-blocking.

Question 11

Is there any coordination one the worker threads? What to do with long-lived connections?

Answer 11

No, the kernel does an adequate load balancing. For long-lived connections Envoy allows forcibly load-balancing.