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Updated on 2025-03-03

Brief analysis of how to package multiple SpringBoot projects into a Docker container

In modern software development, Docker has become a popular containerization technology that can simplify the deployment and management of applications. For multiple projects developed using Spring Boot, packaging them into a Docker container can effectively reduce resource usage and management complexity. This article will explain in detail how to package multiple Spring Boot projects into a Docker container.

Step 1: Prepare the Spring Boot Project

First, make sure you already have multiple Spring Boot projects and that these projects can be successfully built into WAR files. You can configure the following in each project's file to ensure that the project is packaged in WAR format:

<packaging>war</packaging>
<dependencies>
    <dependency>
        <groupId></groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId></groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId></groupId>
        <artifactId>-api</artifactId>
        <scope>provided</scope>
    </dependency>
</dependencies>

Step 2: Create the parent directory

Create a new parent directory (such as my-projects) in the project root directory, and create a subdirectory in this directory to store the WAR files of each project, such as app1, app2, etc.

my-projects/
    ├── app1/
    ├── app2/
    ├── app3/

Step 3: Copy the WAR file to the corresponding directory

In each Spring Boot project, use Maven to build WAR files and copy them into the my-projects directory above, making sure each WAR file is placed in the corresponding subfolders such as app1, app2, etc.

Step 4: Create a Dockerfile

Create a Dockerfile in the my-projects directory, with the following content:

# Use Tomcat basic imageFROM tomcat:9.0

# Copy multiple WAR files to Tomcat's webapps directoryCOPY app1/target/ /usr/local/tomcat/webapps/
COPY app2/target/ /usr/local/tomcat/webapps/
COPY app3/target/ /usr/local/tomcat/webapps/

# Expose the default port of TomcatEXPOSE 8080

Please make sure to replace the file name with your actual WAR file name.

Step 5: Create a file

existmy-projectsCreate a directoryThe file, the content is as follows:

version: '3.8'

services:
  tomcat:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - "8080:8080"

Step 6: Build and run Docker containers

Run the following command in the my-projects directory to build and start the container:

docker-compose up --build

Step 7: Access the application

Once the container starts, you can access your Spring Boot app through your browser, usually via the following URL:

  • http://localhost:8080/app1
  • http://localhost:8080/app2
  • http://localhost:8080/app3

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