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This article mainly explains "how to do load balancing with Springboot+Nginx". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "how to do Springboot+Nginx load balancing".

Introduction to load balancing

Wiki

Baidu Encyclopedia

To put it simply, it is to increase throughput and avoid server overload. Divided into hard (such as F5), soft (such as apache, reverse proxy of nginx, and other modes)

Nginx load balancing network diagram

Nginx load balancing strategy

Nginx load balancer uses upstream configuration. Including built-in policies, as well as policies through third-party plug-ins. Those who are interested can study in depth.

Round robin (default) [Round Robin]

Each request is assigned to a different back-end server one by one in chronological order, and if the server is shutdown, the request will no longer be distributed to that server.

Servername Custom name

Server configuration supports ip/ domain name + portless / portless (80). Content according to the actual configuration

Configurable n server

Upstream servername {server 192.168.0.1 server 8080; server 192.168.0.2 VR 8080;} specify weight [Least Connections]

Specify the probability of round robin by weight. Weight is proportional to the access ratio and is often used in situations where server performance is different.

Servername Custom name

Server configuration supports ip/ domain name + portless / portless (80). Content according to the actual configuration

Weight is directly proportional to the number of visitors, and the larger the number, the greater the rate of round robin.

Configurable n server

Upstream servername {server 192.168.0.1 weight=10; 8080 weight=8; server 192.168.0.2 weight=10; weight=10;} IP binding [IP Hash]

Each request allocates the server according to the hash result of the client ip. In this way, the client can regularly access a server for a certain period of time, and the Session can be maintained. The default implementation of 20 (forgot) hash algorithm to find the server, if not, then take a round-robin (which is an advanced round-robin).

Servername Custom name

Server configuration supports ip/ domain name + portless / portless (80). Content according to the actual configuration

Configurable n server

Upstream servername {ip_hash; server 192.168.0.1 server 8080; server 192.168.0.2 Server parameters

Down indicates that the current server does not participate in the load

Weight defaults to 1. The greater the number, the greater the load weight.

Max_fails allows the number of failed requests to return the error defined by the proxy_next_upstream module when the maximum number of times is exceeded

The time the server pauses after a fail_timeout:max_fails failure

Backup: all other non-backup machines down or request this machine when busy. This machine has the least pressure.

Upstream servername {server 192.168.0.1 down; server 8080 weight=10 max_fails=30 fail_timeout=12; server 192.168.0.2 down; server 8080 weight=8; server 192.168.0.3 down; server 8080 backup;} Nginx+Springboot to implement load balancing environment

JDK1.8 above

Nginx 1.15 +

Test package: https://github.com/liuqi0725/springboot-useful/tree/master/springboot-soft-balance-nginx

Test package usage

Download the test package it is recommended to use the GitZip for github plug-in to download the stand-alone directory

Perform clean and package operations to put the packaged jar and application.yaml together

Modify the application.yaml port address.

Start multiple services

Access http://localhost/hello/username username customization on different client machines after startup. Test load balancing

Nginx Session sharing

Using reverse proxy load balancing, it is inevitable to face Session sharing. The general way is cookie, memcache, redis to manage shared data. The following Springboot-security project will be devoted to it.

Nginx configuration

Configure the ip_hash used. Can be replaced with other policy tests.

Worker_processes 1 leading events {worker_connections 1024;} http {include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream springbootnginx {ip_hash; # can both be placed locally. Modify the port # and put a server 192.168.1.130 upstream springbootnginx locally. # other machines put a server 192.168.1.120 server 8080;} server {listen 80; server_name 192.168.1.130; location / {root html; # points to reverse proxy proxy_pass http://springbootnginx; proxy_connect_timeout 3s; proxy_read_timeout 5s Proxy_send_timeout 3s; index index.html index.htm;} error_page 500502503504 / 50x.html; location = / 50x.html {root html;}} at this point, I believe you have a better understanding of "how to do load balancer in Springboot+Nginx". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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