Shulou(Shulou.com)06/01 Report--

This article mainly introduces the relevant knowledge of "how to use Openresty". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how to use Openresty" can help you solve the problem.

Openresty is a high-performance Web platform based on Nginx and Lua, which integrates a large number of excellent Lua libraries, third-party modules and most dependencies. It is used to easily build to handle ultra-high concurrency and expansibility.

Openresty is an open source project initiated by Chinese people. I probably took a look at it and experienced it. In terms of technical implementation, the perspective is very interesting. Openresty is a Nginx-based web server. What is interesting is that Openresty's idea is to integrate web application services into Nginx. As we all know, Nginx is usually used with Node.js, Go, PHP and other back-end technologies to complete a complete service through inter-process communication or socket.

So how does Openresty do it? Openresty integrates the third-party module of Nginx and the Lua language into Nginx, and then packs a new package Openresty. Analogy Node.js,V8 supports the js language, but does not have network, file and other functions. Node.js is based on these features in the V8 extension, and then packages V8 and other code into Node.js as a new product. Nginx does not have the ability to execute scripts. Openresty is based on Nginx and integrates the capabilities of lua through third-party modules to execute lua script code in Nginx.

Through Openresty, we write lua code directly to complete the logic of the entire business code. The key point is that in Openresty we have the ability at the language level, and the events that can be done are not limited to those provided by Nginx itself. The Openresty source code includes a lot of code, including many third-party Nginx and lua modules, but we only focus on the principle.

LuaJIT is the JIT compiler of lua language. It is said that the speed is amazing. Nginx is the kernel of Nginx. Ngx_lua integrates lua into Nginx through the third-party module of Nginx. Let's see how to use it. You can download the source code from the official website. Compile and install in three steps.

. / configuremake sudo make install

And then execute

Mkdir openresty-test openresty-test/logs/ openresty-test/conf/

Then create a new configuration file nginx.conf in conf. Write

Worker_processes 2; events {worker_connections 1024;} http {server {listen 8888; location / {default_type text/html; content_by_lua_block {ngx.say ("Hi")}

And then execute

Nginx-p openresty-test

At this point, our Nginx starts, and when we visit port 8888, we will see the output of Hi. We see that there is a content_by_lua_block instruction in the Nginx configuration, which is not a built-in instruction for Nginx, but an extension of Openresty. When the route in location is matched, the third-party module of Nginx invokes lua's engine to execute the lua script in content_by_lua_block. With the power of lua, Openresty can do a lot more than Nginx, coupled with the high performance of Nginx and luajit. A flexible and high-performance web server is implemented. For example, we can use Openresty as a gateway to achieve routing, authentication, monitoring and other functions. Openresty chooses lua language, and lua itself is simple enough, and it is well implemented with the off-the-shelf modules of the underlying language, which reduces the development cost. All in all, I think Openresty is a cool and interesting project.

This is the end of the introduction to "how to use Openresty". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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