文件列表:

api (0, 2023-06-10)
api\Dockerfile (215, 2023-06-10)
api\main.py (181, 2023-06-10)
api\requirements.txt (258, 2023-06-10)
api\upstreams.json (154, 2023-06-10)
docker-compose.yml (270, 2023-06-10)
justfile (258, 2023-06-10)
origin (0, 2023-06-10)
origin\Dockerfile (119, 2023-06-10)
origin\http.conf (3610, 2023-06-10)

# Dynamic Upstream learning Just playing with some NGINX lua balancing features ## Motivation I wanted to learn more about how to balance requests to upstreams in a more dynamic way. What if I need to route some requests to one upstream A, and some other requests to upstream B. ## Problem You have given the task of balancing requests. If a request with `/foo/something` comes in you need to balance the requests between to server A (primary) and pick the server B (backup) when A does not work. Ok, it could be a static upstream in NGINX, right? Yes, you are right but rabbits don't come easy. Servers come and go, and we need to be ready to deliver different hosts for different requests. ```mermaid sequenceDiagram participant User participant NGINX participant Server1 as 127.0.0.2 participant Server2 as 127.0.0.3 User->>NGINX: Request /foo/something NGINX->>Server1: Proxy Pass Server1->>NGINX: Success Response NGINX->>User: Forward Success Response User->>NGINX: Request /foo/something NGINX->>Server1: Proxy Pass Server1-->>NGINX: Failure Response NGINX->>Server2: Proxy Pass Server2->>NGINX: Success Response NGINX->>User: Forward Success Response ``` ## Running Dependencies: * [just](https://github.com/casey/just) * [docker compose](https://docs.docker.com/compose/) ```console $ just -l Available recipes: rebuild # Rebuild all containers reload # Reload NGINX run # Start origin and upstreams API stop # Stop origin and upstreams API ``` ```console $ just run ``` Now you have NGINX running on 8080 and upstreams API on 8081. Go ahead and make a request for an existing upstream: ``` curl -v http://localhost:8080/upstream1/foo ``` Then for an upstream that does not exist: ``` curl -v http://localhost:8080/upstream2/foo ``` Compare the logs and the HTTP responses.

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