How to use dockercompose to build springboot-mysql-nginx application

Using docker to build spring-boot applications is to build the compiled jar package into the image.

This article runs spring-boot together with the database as a set of docker services.

Here I just record my own operations. For the complete running code, see the content in Quote 1 in "Reference".
(How I modify the mysql mapping directory and obtain the remote IP)

Main steps:

• Build a simple springboot application

• Adding support under docker to the application

• Writing dockercompose configuration file

• Practical operation

Build a simple springboot application

Make a web application and count the number of IP visits to the site.

And stored in the mysql database, here we use jpa to access the database.

Dependencies

<parent>
  <groupid>org.springframework.boot</groupid>
  <artifactid>spring-boot-starter-parent</artifactid>
  <version>2.0.0.release</version>
</parent>

Web, jpa, mysql, tset library dependencies

<dependencies>
  <dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-web</artifactid>
  </dependency>
  <dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-data-jpa</artifactid>
  </dependency>
  <dependency>
    <groupid>mysql</groupid>
    <artifactid>mysql-connector-java</artifactid>
  </dependency>
  <dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-test</artifactid>
    <scope>test</scope>
  </dependency>
</dependencies>

Configuration file

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.driver
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.mysql5innodbdialect
spring.jpa.show-sql=true

Core code

@restcontroller
public class visitorcontroller{
 @autowired
 private visitorrepository repository;
 @requestmapping("/")
 public string index(httpservletrequest request)
 {
 string ip= request.getheader("x-real-ip");
 if(ip== null || "".equals(ip))
 {
  ip = request.getremoteaddr();
 }
 visitor visitor = repository.findbyip(ip);
 if(visitor == null)
 {
  visitor = new visitor();
  visitor.setip(ip);
  visitor.settimes(1l);
 }
 else
 {
  visitor.settimes(visitor.gettimes()+1);
 }
 repository.save(visitor);
 return "ip:"+visitor.getip()+" "+visitor.gettimes()+" times.";
 }
}

Entity class

@entity
public class visitor {
 @id
 @generatedvalue
 private long id;
 @column(nullable=false)
 private long times;
 @column(nullable=false)
 private string ip;
 // get,set 方法略
}

Repository layer code refers to jpa related content.

The local database is opened, and the password is the one in the above configuration. After running it using mvn spring-boot:run, you can see the number of IPs, which will increase after each statistics.

dockercompose configuration file

Create a new docker-compose.yaml file, as follows:

version: '3'
services:
 nginx:
  container_name: v-nginx
  image: nginx:1.13
  restart: always
  ports:
  - 80:80
  - 443:443
  volumes:
  - ./nginx/conf.d:/etc/nginx/conf.d
 mysql:
  container_name: v-mysql
  image: mysql/mysql-server:5.7
  environment:
  mysql_database: test
  mysql_root_password: root
  mysql_root_host: '%'
  ports:
  - "3306:3306"
  volumes:
  - ./mysqldata:/var/lib/mysql
  restart: always
  
 app:
  restart: always
  build: ./app
  working_dir: /app
  volumes:
   - ./app:/app
   - ~/.m2:/root/.m2
  expose:
   - "8080"
  depends_on:
   - nginx
   - mysql
  command: mvn clean spring-boot:run -dspring-boot.run.profiles=docker

Mainly explain this configuration file, and Add relevant configurations to the file system.

There are three services under services nginx, mysql, app.
images specifies the use of images. nginx and mysql are directly taken from the docker warehouse.
The image is not specified in the app, but the directory where the dockerfile is located is specified with build.
volumes specifies the mapping between files in the local directory and the container target address.
environment configures the environment variables required by the container
ports configures the mapping port between the local and the container, with the local port in front and the container port in the back

The role of volumes configuration under ngixn: The nginx configuration file we wrote directly overwrites the default nginx configuration file in the container.

The role of volumes configuration under mysql: maps the mysql data files to the local mysqldata directory. When the container is deleted, the data is still there.

The role of volumes configuration under app: The first line is to map the code file to the container. The second line is to map the maven warehouse file to the local. After deleting the container, build it again without re-downloading the dependency packages.

command: mvn clean spring-boot:run -dspring-boot.run.profiles=docker

The command is to compile and run the project in the container, use docker profiles.

So the file we want to add

• dockerfile: Create a new file and add a line from maven:3.5-jdk-8

• docker profiles: Copy application.properties to application-docker.properties, and change the database connection address in application-docker.properties to jdbc:mysql://mysql:3306/test.

• nginx configuration file

server {
  listen 80;
  charset utf-8;
  access_log off;
  location / {
    proxy_pass http://app:8080;
    proxy_set_header host $host:$server_port;
    proxy_set_header x-forwarded-host $server_name;
    proxy_set_header x-real-ip $remote_addr;
    proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
  }
  location /static {
    access_log  off;
    expires   30d;
    alias /app/static;
  }
}

Deployment verification

Put the overall file Copy it to the server and run it using docker-compose up.

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