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This article introduces the relevant knowledge of "how to use OpenRestry to achieve load balancing and current limitation". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Many people may not have heard of OpenRestry, but it has developed rapidly in recent years and has been used by many big factories, including BAT, JD.com, Hammer and so on. So, I have to say, the best part of a wave of learning OpenRestry is coming.

OpenResty can extend nginx functions through lua scripts, including functions that make you feel that nginx does not meet your requirements, which you can achieve through OpenResty.

Nginx itself is written in C, but in order to achieve some custom features, it is not realistic for you to relearn C, so when you know OpenResty, it will come in handy. The learning cost of lua is much lower than that of C, and lua is used in Redis. Therefore, I think learning OpenResty is a very good choice, cost-effective is very high.

Today, I will give you a brief introduction to two scenarios that use OpenResty: load balancing and current restriction. Of course, there are too many scenarios for the use of OpenResty, including attack and defense, such as cc attacks. But these contents suggest that everyone in private, interested to learn by themselves.

I won't talk about OpenResty installation. Let's take a look at a hello World demo to familiarize us with how it works.

In the nginx.conf configuration file, add the code content_by_lua.

Let's take a look at how to implement our own load balancing strategy by using OpenResty configuration and lua scripts.

You can implement the code in balancer.lua yourself. Here is one of my demo codes.

There are many load balancing algorithms, you can refer to my article "hand in hand to teach you to write 6 load balancing algorithms".

Finally, let's take a look at the configuration information in a current-limiting demo,nginx.conf as follows:

The code in limit_conn.lua is also very simple, pasted as follows:

You can see that with the help of Lua as a scripting language, combined with OpenRestry, it is very easy to achieve custom functions.

This is the end of the content of "how to use OpenRestry to achieve load balancing and current restriction". Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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