Tutorial on deploying springboot package in linux environment using docker

Because springboot has a built-in tomcat server, it can be run directly after being packaged into a jar package.

First, let's look at the packaging deployment in the Windows environment

1. Install and package

2. Check whether the project jar package exists in the target directory

3. If the project jar package already exists, you can run it directly (as mentioned earlier, the springboot package can be run directly)

4. Use the java -jar command in the dos command box

java -jar springboot-nriat-common-demo-0.0.1-SNAPSHOT.jar 

Startup effect:

No error, startup successful!

The above is about the springboot package deployment on the windows system. Let's get to the point.

Use docker to deploy packages in linux system.

1. First, you need to prepare a dockerfile file, the content of the file is as follows:

# Specify the base image FROM java:8
# Maintainer information MAINTAINER lbl
# Define anonymous volume VOLUME /tmp
#Copy the file or change the name ADD springboot-nriat-common-demo-0.0.1-SNAPSHOT.jar app.jar
# Allow the specified port EXPOSE 8087
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

File parsing

Explain this configuration file:

VOLUME specifies the temporary file directory as /tmp. The effect is that a temporary file is created in the host's /var/lib/docker directory and linked to the container's /tmp. This step is optional, but necessary if the application involves a file system. The /tmp directory is used to persist to the Docker data folder, because the embedded Tomcat container used by Spring Boot uses /tmp as the working directory by default. The project's jar file is added to the container as "app.jar"
ENTRYPOINT Execute project app.jar. To shorten Tomcat startup time, add a system property pointing to "/dev/./urandom" as Entropy Source

If it is the first time to package, it will automatically download the Java 8 image as the base image, and will not download it again when making images in the future.

2. Put the dockerfile file and the jar package of the springboot project in the same folder

3. Then start making the image

docker build -t springboot-docker .

Use docker images to check whether the image has been generated

docker images

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5. Configure the springboot project and start the container

docker run -d -p 8087:8087 8493c1f0592c

The -d parameter allows the container to run in the background
-p is for port mapping. In this case, port 8080 in the server is mapped to port 8087 in the container (the port configured in the project is 8087). The port uses the IMAGE ID of the images image.

6. Finally, use docker ps -a to check whether it has been started.

docker ps -a 

Startup successful! !

This is the end of this article about using docker to deploy springboot packages in a linux environment. For more information about docker deploying springboot packages, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope you will support 123WORDPRESS.COM in the future!