First, start chapter 1 by creating the Microservices directory in the home directory.

cd ~ && mkdir microservices && cd microservices
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Nginx01, nginx02, and nginx03 are used as reverse proxy servers to evenly forward requests to nginx02 and nginx03.

mkdir -p ./nginx/nginx01 ./nginx/nginx02 ./nginx/nginx03
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The display effect is shown below.

Nginx ├─ nginx ├─ nginx ├─ nginx ├─ nginxCopy the code

Copy the configuration file in the nginx image to each subdirectory for mounting. Create a temporary container, copy the configuration file to the host directory, and then delete the temporary container.

docker run --name tmpnginx -d nginx:latest
docker cp tmpnginx:/etc/nginx/nginx.conf ~/microservices/nginx/nginx01
docker cp tmpnginx:/etc/nginx/nginx.conf ~/microservices/nginx/nginx02
docker cp tmpnginx:/etc/nginx/nginx.conf ~/microservices/nginx/nginx03
docker cp tmpnginx:/etc/nginx/conf.d ~/microservices/nginx/nginx01
docker cp tmpnginx:/etc/nginx/conf.d ~/microservices/nginx/nginx02
docker cp tmpnginx:/etc/nginx/conf.d ~/microservices/nginx/nginx03
docker rm -f tmpnginx
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The nginx directory is shown below.

Nginx ├ ─ ─ nginx01 │ ├ ─ ─ the conf. D │ │ └ ─ ─ the default. The conf │ └ ─ ─ nginx. Conf ├ ─ ─ nginx02 │ ├ ─ ─ the conf. D │ │ └ ─ ─ the default. The conf │ └ ─ ─ ├─ ├─ nginx.conf, ├─ nginxCopy the code

Create a file docker-comemage. yml in the root directory, create three Web services, and map the configuration files to the corresponding files in the container.

version: '3'

services:
  web01:  # service name
    image: nginx:latest # image
    container_name: web01 # container name
    ports:  # mapping port number, former host port, latter container port
      - 8080: 80
    volumes: The former host directory, the latter container directory
      - ./nginx/nginx01/nginx.conf:/etc/nginx/nginx.conf # config file
      - ./nginx/nginx01/conf.d:/etc/nginx/conf.d # extend configuration directory
      - ./nginx/html:/usr/share/nginx/html # HTML directory

  web02:
    image: nginx:latest
    container_name: web02
    volumes:
      - ./nginx/nginx02/nginx.conf:/etc/nginx/nginx.conf
      - ./nginx/nginx02/conf.d:/etc/nginx/conf.d
      - ./nginx/html:/usr/share/nginx/html

  web03:
    image: nginx:latest
    container_name: web03
    volumes:
      - ./nginx/nginx03/nginx.conf:/etc/nginx/nginx.conf
      - ./nginx/nginx03/conf.d:/etc/nginx/conf.d
      - ./nginx/html:/usr/share/nginx/html
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Open the nginx/nginx01 / conf. D/default. Conf. On the top of the article to join upstream configuration, web02 and web03 docker – compose. Yml container_name name defined in the container.

upstream backend {
    server web02:80;
    server web03:80;
}
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Add proxy_pass to location/to forward requests to backend.

location / {
    root   /usr/share/nginx/html;
    index  index.html index.htm;
    proxy_pass http://backend;  # append line
}
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When the configuration is complete, run the following command to start the container.

cd ~/microservices
docker-compose up
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Success if the following information is displayed.

Recreating microservices_web01_1 ... done
Recreating microservices_web02_1 ... done
Recreating microservices_web03_1 ... done
Attaching to web02, web01, web03
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Create an index. HTML file in the nginx directory and type Hello world! Run again.

Microservices ├ ─ ─ docker - compose. Yml └ ─ ─ nginx ├ ─ ─ HTML │ └ ─ ─ index. The HTML ├ ─ ─ nginx01 │ ├ ─ ─ the conf. D │ │ └ ─ ─ the default. The conf │ └ ─ ─ nginx. Conf ├ ─ ─ nginx02 │ ├ ─ ─ the conf. D │ │ └ ─ ─ the default. The conf │ └ ─ ─ nginx. Conf └ ─ ─ nginx03 ├ ─ ─ the conf. D │ └ ─ ─ default. Conf └ ─ ─ nginx. ConfCopy the code

Now to test this, go to localhost:8080 in your browser and watch the log printed by the terminal.

Web01 | 172.24.0.1 - [26 / Jun / 2019:01:48:28 + 0000]"The GET/HTTP / 1.1" 304 0 "-" "Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36" "-"Web02 | 172.24.0.2 - [26 / Jun / 2019:01:48:28 + 0000]"The GET/HTTP / 1.0" 304 0 "-" "Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36" "-"
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The preceding content indicates that the request is forwarded to Web02 through Web01.

Web01 | 172.24.0.1 - [26 / Jun / 2019:04:42:36 + 0000]"The GET/HTTP / 1.1" 304 0 "-" "Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36" "-"Web03 | 172.24.0.2 - [26 / Jun / 2019:04:42:36 + 0000]"The GET/HTTP / 1.0" 304 0 "-" "Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36" "-"
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So far, the basic load balancing deployment is complete. Web01 is used to balance requests to Web02 and Web03. This method is called polling.

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