Nginx practical application load balancing

Bobo roast duck 2020-11-13 05:00:09
nginx practical application load balancing


In this article, we continue to introduce nginx Actual operation of , Here's how Nginx Implementation of load balancing based on .

Load balancing

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Let's take a look at the above load balancing diagram , You'll find that it's very similar to the reverse agent we talked about last time, isn't it ? If the real server has more than one, is it the structure diagram above us ? So what is load balancing ? In fact, on the basis of reverse proxy, users' requests are forwarded to the corresponding real services through various load strategies .

The general principle of network load balancing is to allocate the network load balance to each operation unit of network cluster by using a certain allocation strategy , It enables a single heavy load task to be shared to multiple units for parallel processing , Make a large number of concurrent access or data traffic shared on a number of units to deal with separately , So as to reduce the waiting response time of users
upstream yes Nginx Of HTTP Upstream modular , This module uses a simple scheduling algorithm to implement the client IP Load balancing to back end servers

Nginx Load balancing practice

1. Create three web service

On the basis of the last article, we create two more services , The ports of the three services are 8081 8082 8083.

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2.Nginx To configure

upstream block
upstream name{…}

upstream gupao{

server 192.168.12.1:8081;
server 192.168.12.1:8082;
server 192.168.12.1:8083;
}
server {

location / {

proxy_pass http://gupao;
}
}

server block
grammar :

server address [parameters]
form explain
server Mandatory
address Mandatory It can be the host name 、 domain name 、ip, Port number can also be specified
parameters Optional
down: At present server deactivated
backup: At present server It's a backup server , There is nothing but backup The back-end servers are all hung up or busy before they can be allocated to the requests
weight: At present server Load weight , The greater the weight, the greater the chance of being requested . The default is 1
max_fails and fail_timeout Generally used in association , If a station server stay fail_timeout In time max_fails Secondary connection failed , that Nginx Think it's dead , Thus in fail_timeout No more requests in time ,fail_timeout The default is 10s,max_fails The default is 1, That is, by default, if there is an error, it will be considered that the server is down , If you will max_fails Set to 0, It means the inspection is cancelled .

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Upstream Module scheduling algorithm

1. polling ( Default ): Each request is allocated to different back-end servers in chronological order , If the backend server down fall , Can be eliminated automatically
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2.Ip_hash: Per request by access ip Of hash Result distribution , In this way, each visitor has fixed access to a back-end server , Can solve session The problem of
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3. The weight : That is, you can specify the polling rate ,weight Proportional to the chance of access , It is mainly used in heterogeneous back-end servers
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4. response time : Allocate requests fairly according to the server's response time , It means the priority allocation with the shortest response time on the back end
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Check the configuration file and the prompt is not recognized fair This is because fair Belongs to a third party module , It's not in the official package .
https://github.com/gnosek/nginx-upstream-fair The official download
Then decompress
unzip nginx-upstream-fair-master.zip

 Not installed Nginx
Switch to Nginx The directory performs an operation
To configure :
./configure --prefix=/usr/local/nginx --sbin-path=/usr/local/nginx/nginx --conf-path=/usr/local/nginx/nginx.conf --pid-path=/usr/local/nginx/nginx.pid --add-module=/home/nginx-upstream-fair-master
Compilation and installation
make && make intstall
Installed Nginx
Switch to Nginx The directory performs an operation
To configure
./configure --prefix=/usr/local/nginx --sbin-path=/usr/local/nginx/nginx --conf-path=/usr/local/nginx/nginx.conf --pid-path=/usr/local/nginx/nginx.pid --add-module=/home/nginx-upstream-fair-master
compile
make
Copy Nginx
cp objs/nginx /usr/local/nginx/nginx

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5.url_hash: and iphash similar ,urlhash The visit is based on url Of hash Results to allocate requests , Make the same url Access to the same server

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You also need to install third-party plug-ins

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本文为[Bobo roast duck]所创,转载请带上原文链接,感谢

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