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This article is about how to build a nginx load balancing server in docker. The editor thinks it is very practical, so I share it with you. I hope you can get something after reading this article. Let's follow the editor to have a look.

1. What is load balancing?

Load balancing, known as Load Balance in English, means to balance and distribute the load (work tasks) to multiple operation units, such as FTP server, Web server, enterprise core application server and other major task servers, so as to complete the work task together.

two。 Common load balancing

There are two common ways to implement load balancing (one is hardware implementation, the other is software implementation)

1) hardware implementation

There are many hardware load balancers, all of which are commercial and expensive.

2) Software implementation

The software implementation is based on linux load balancing strategy, such as nginx, LVS and so on. (today we will talk about the implementation through software (nginx).)

3. Implementation of load balancing server through nginx

Since I implement it natively, I use docker's nginx image here to instantiate several nginx containers to simulate

1) pull a nginx first

Docker pull nginx:1.15.12

2) instantiate a container (run)

D ocker run-- name master-nginx-p 9080 nginx:1.15.12 80-d nginx:1.15.12

-- the name of the nginx container name

Port 80 of the-p container is mapped to port 9080 of the local machine

-d background daemon running

3) enter this container to configure nginx's load balancer

3-1) here we enter the configuration file of nginx

Cd / etc/nginx/conf.d

Vim default.conf (may prompt that vim does not exist, execute apt-get update to update the package, then execute apt-get install vim to install vim and run vim nginx.conf again)

Add:

Upstream myPond {

Server 127.0.0.1:8000 weight=3

Server 127.0.0.1:8001

Server 127.0.0.1:8002

Server 127.0.0.1:8003

}

Location is modified to: location / {proxy_pass http://myPond;}

Save, restart the container

Docker restart Container id

This is where our load balancer is configured.

4)

Visit http://127.0.0.1:9080/

Tip:

An error occurred.

Sorry, the page you are looking for is currently unavailable.

Please try again later.

If you are the system administrator of this resource then you should check the error log for details.

Faithfully yours, nginx.

This is because we haven't configured it yet:

Server 127.0.0.1:8000

Server 127.0.0.1:8001

Server 127.0.0.1:8002

Server 127.0.0.1:8003

1) enter the nginx container again

Docker exec-it container id / bin/bash

2) create multiple sites

Enter the nginx multi-site configuration folder

Cd / etc/nginx/conf.d/

Vim creates a.conf, b.conf, c.conf, d.conf

The contents are as follows:

Server {

Listen 8000

Location / {

Index index.html

Root / home/www/a

}

}

Server {

Listen 8001

Location / {

Index index.html

Root / home/www/b

}

}

Server {

Listen 8002

Location / {

Index index.html

Root / home/www/c

}

}

Server {

Listen 8003

Location / {

Index index.html

Root / home/www/d

}

}

Let's write in the following file:

/ home/www/a/index.html

Server:127.0.0.1:8000

/ home/www/b/index.html Server:127.0.0.1:8001

/ home/www/c/index.html Server:127.0.0.1:8002

/ home/www/d/index.html

Server:127.0.0.1:8003

Finally, let's test it.

The above is how to build a nginx load balancing server in docker. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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