Skip to content

Latest commit

 

History

History
93 lines (73 loc) · 3.24 KB

DOCKER.MD

File metadata and controls

93 lines (73 loc) · 3.24 KB

Minimal Docker

📗 1. Create the Dockerfile:

FROM adoptopenjdk/openjdk11:alpine
EXPOSE 8080
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","/app.jar"]

📗 2. Build the image

docker build . -t ff4j/sample-springboot:mini

📗 3. Run the image

docker run -p 8080:8080 ff4j/sample-springboot:mini

📗 4. Call the layer

docker history ff4j/sample-springboot:mini

Output

IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
7c229fbdfff9        13 minutes ago      ENTRYPOINT ["java" "-jar" "/app.jar"]           0B                  buildkit.dockerfile.v0
<missing>           13 minutes ago      COPY target/*.jar app.jar # buildkit            40.7MB              buildkit.dockerfile.v0
<missing>           13 minutes ago      ARG JAR_FILE=target/*.jar                       0B                  buildkit.dockerfile.v0
<missing>           13 minutes ago      EXPOSE map[8080/tcp:{}]                         0B                  buildkit.dockerfile.v0
<missing>           10 days ago         /bin/sh -c #(nop)  CMD ["jshell"]               0B                  
<missing>           10 days ago         /bin/sh -c #(nop)  ENV JAVA_HOME=/opt/java/o…   0B                  
<missing>           10 days ago         /bin/sh -c set -eux;     apk add --no-cache …   325MB               
<missing>           10 days ago         /bin/sh -c #(nop)  ENV JAVA_VERSION=jdk-11.0…   0B                  
<missing>           10 days ago         /bin/sh -c apk add --no-cache tzdata --virtu…   14.2MB              
<missing>           10 days ago         /bin/sh -c #(nop)  ENV LANG=en_US.UTF-8 LANG…   0B                  
<missing>           2 weeks ago         /bin/sh -c #(nop)  CMD ["/bin/sh"]              0B                  
<missing>           2 weeks ago         /bin/sh -c #(nop) ADD file:f17f65714f703db90…   5.57MB

Layered Jar

post slides

Edit pom

<plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
	            <configuration>
	     		 <layers>
                  <enabled>true</enabled>
                 </layers>
                </configuration>
            </plugin>

First of all, we need to create a layered JAR. By default, Spring Boot splits the data in four layers:

  • dependencies – includes all non snapshot dependency JARs
  • spring-boot-loader – includes loader for JARs and classes
  • snapshot-dependencies – includes all snapshot dependency JARs
  • application – includes application code and resource files

📗 1. Create the Dockerfile:

TBD

📗 2. Build the image

docker build . -t ff4j/sample-springboot:layers

📗 3. Run the image

docker run -p 8080:8080 ff4j/sample-springboot:layers

https://docs.docker.com/develop/develop-images/dockerfile_best-practices/ https://cloud.google.com/solutions/best-practices-for-building-containers

Dockerize https://github.com/jwilder/dockerize