How to set nginx current limit

1. Current-limiting nginx settings

nginx current-limiting module upstream

is placed in the http module# Current limiting concurrency

upstream node{
server 127.0.0.1:8080 max_conns=1;
}

#Exceeding requests will return a 502 status code

Place it in the server module

#test address, and access the server py path will be forwarded to the local machine's 8080 Port

location /py {
proxy_pass http://node/;
}

#Error redirect to downgrade interface

error_page 502 503 https://fund/b.html;

Note: If one / is missing, the request will be forwarded to the /py path of 8080

proxy_pass http://node；

2. Prepare the test environment

Open port 8080 and use web.py to open a simple port

Install web.py

pip install web.py==0.40-dev1

Write the website script webtest.py

import web

urls = (
   '/', 'index')

class index:
   def GET(self):
       return "Hello, world!"if __name__ == "__main__":
   app = web.application(urls, globals())
   app.run()

Run the script to start the port python webtest.py 0.0.0.0:8080. Start the 8080 port to allow any IP access

3. Test current limiting configuration

Use jmeter to test

1. Set the current limit to the number of concurrent connections 1

Request

Result

Concurrent requests 5, sent 100 times, a total of 500 requests, 367 successful, 133 failed

Concurrent requests 10. Sent 100 times, a total of 1000 requests, 566 successful, 434 failed

Concurrent requests 20. Sent 100 times, 2000 requests in total, 848 successful, 1152 failed

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