In nginx, the difference between ip_hash and url_hash
Recently looking at the load balancing of nginx, I found that in order to solve the session problem of nginx, there are two methods, namely ip_hash and url_hash. ip_hash maintains the session based on ip, while url_hash is based on url address. The advantage of url_hash is that it can improve The efficiency of the back-end cache server, such as improving the efficiency of Squid, but the disadvantage is that when the back-end server goes down, url_hash will not automatically jump to other cache servers, but will return a 503 error to the user. What I want to ask is , does ip_hash solve this problem, will it jump to other machines, or will it still return a 503 error? What is the difference between ip_hash and url_hash, and can nginx solve both the session problem and the backend problem? Server health check issue. I remember that Squid can perform health checks and maintain sessions.
Or you can use memcached to maintain the session and achieve session sharing without worrying about the session being dropped
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The above introduces the difference between ip_hash and url_hash in nginx, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.

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