The whole process of IDEA integrating docker to deploy springboot project

1. IDEA downloads the docker plug-in

I won’t go into details here, just install it like other plugins

2. Cloud Server Docker

Note: My server uses centOS 7

2.1 Docker installation

https://www.jb51.net/article/213611.htm

2.2 Stop Docker Service

To prevent errors when restarting the Docker service, it is best to stop the Docker service first and then modify the configuration file.

Before stopping Docker, you must stop the running container first, otherwise errors may occur when starting the container later.

Stop the running container:

docker stop [container_id]

Then stop the docker service

systemctl stop docker

2.3 Docker configuration file modification

In order to use HTTP to connect IDEA to the docker on the server, you need to modify the docker configuration file as follows:

vim /usr/lib/systemd/system/docker.service

Modify the Execstart line and replace it with the following content to open port 2375 for HTTP remote connections:

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

2.4 Refresh the configuration file

The command is as follows:

systemctl daemon-reload

To test whether the configuration file is effective, enter the following command on the server. If the JSON string content appears, the file is effective.

curl http://127.0.0.1:2375/version

2.5 Start the Docker service

The command is as follows:

systemctl restart docker

2.6 Add port 2375 to the firewall

The command is as follows:

firewall-cmd --zone=public --add-port=2375/tcp --permanent

Restart the firewall:

firewall-cmd --reload

2.7 Alibaba Cloud adds security group rules

Here, please note that you need to enter the security group on the instance page, then configure the rules and open port 2375.

2.8 Testing remote HTTP connection

Enter http://127.0.0.1:2375/version in the local browser. Similarly, if a JSON string appears, an HTTP connection can be made.

At this point, you can use IDEA to integrate dokcer.

3. Maven project packaging

3.1 Packaging plugins

Add the springboot packaging plug-in to the pom file

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
</plugin>

3.2 Packaging of resource files and their location after packaging

In addition to packaging Java source files, you also need to package resource files, such as XML/YML/Properties/HTML files. But pay attention to the location where the HTML file is packaged. It should be placed in the META-INF/resources directory. Otherwise, the HTML page cannot be accessed after starting the jar package.

<resources>
    <resource>
        <directory>src/main/java</directory>
        <!--Here I put the mapper file in the java directory so I need to declare the compilation location-->
        <includes>
            <include>**/*.xml</include>
        </includes>
        <filtering>true</filtering>
    </resource>
    <resource>
        <!--Declare the compile location of the yml configuration file-->
        <directory>src/main/resources</directory>
    </resource>
    <resource>
        <!--Declare the HTML file compilation location and put the compiled file into the specified location-->
        <directory>src/main/webapp</directory>
        <targetPath>META-INF/resources</targetPath>
    </resource>
</resources>

3.3 Docker plugin

There are two things to note. First, there needs to be a prefix in front of the Docker image name, which is composed of [prefix]:[image name]:[version number]. Second, uppercase letters must not be included when specifying the image name.

Both name and version are used in project information

<groupId>org.team</groupId>
<artifactId>coolmeeting</artifactId>
<version>1.0-SNAPSHOT</version>
<name>coolmeeting</name>
<description>docker start meetingMS</description>

<properties>
    <java.version>1.8</java.version>
    <docker.image.prefix>team</docker.image.prefix>
</properties>


<plugins>
    <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
    <!-- tag::plugin[] -->
    <plugin>
        <groupId>com.spotify</groupId>
        <artifactId>docker-maven-plugin</artifactId>
        <version>1.0.0</version>
        <configuration>
            <dockerHost>http://127.0.0.1:2375</dockerHost>
            <!--Image name cannot contain uppercase letters-->
            <imageName>${docker.image.prefix}/${project.artifactId}</imageName>
            <!--Dockerfile location-->
            <dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory>
            <resources>
                <resource>
                    <targetPath>/</targetPath>
                    <!--target location-->
                    <directory>${project.build.directory}</directory>
                    <!--Put the jar package and Dockerfile in the same directory-->
                    <include>${project.build.finalName}.jar</include>
                </resource>
            </resources>
        </configuration>
    </plugin>
    <!-- end::plugin[] -->

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <configuration>
            <skipTests>true</skipTests>
        </configuration>
    </plugin>
</plugins>

The Dockerfile file is as follows. Note that D should be capitalized when creating the file. /meetingMS.jar is an alias for easy writing.

FROM java:8
VOLUME /tmp
ADD coolmeeting-1.0-SNAPSHOT.jar /meetingMS.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/meetingMS.jar"]

3.4 clean, install and docker build

First use Maven to clean and install, then use the Maven plugin docker to build

The packaged file directory:

Start the container

Set startup parameters

4. Pitfalls encountered

• Image name problem (cannot contain uppercase letters)
• Springboot configuration file application.yml cannot be packaged
• The html page cannot be accessed after packaging

5. References

Springboot packaged as jar cannot access jsp or html, 404 error

About yml or properties files not being scanned

Specify the startup port when running the Jar package

stackover

IDEA integrates Docker to quickly deploy SpringBoot applications

IDEA integrates Docker for quick deployment

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