How to create Docker Image and run Java App (Spring Boot Jar) in a Docker Engine | InterviewDot
Docker is a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and ship it all out as one package.
Benefits :
- Its working in my machine, and why its not working in your machine ? resolved "Build once and deploy anywhere".
- Docker containers can run on any platform AWS EC2, Google Cloud Platform, Rackspace, Virtual Box, etc.
- Docker images can be version controlled.
- Rapid deployment.
https://hub.docker.com/editions/community/docker-ce-desktop-mac
Create a new Spring Boot Rest Project using https://start.spring.io/
$ mvn spring-boot:run
As usual, the application will be running on port 8080. To test this endpoint, navigate your browser (or use curl, postman, etc.) to "http://localhost:8080/docker/interviewdot", you will see a response.
Dockerfile – Specifying a file that contains native Docker commands to build the image A Dockerfile is just a regular .txt file that includes native Docker commands that are used to specify the layers of an image.
FROM java:8-jdk-alpine
COPY ./target/demo-docker-0.0.1-SNAPSHOT.jar /usr/app/
WORKDIR /usr/app
RUN sh -c 'touch demo-docker-0.0.1-SNAPSHOT.jar'
ENTRYPOINT ["java","-jar","demo-docker-0.0.1-SNAPSHOT.jar"]
Vinoths-MBP:demo-docker vinothkumar$ docker build -t interviewdot:1 .
Sending build context to Docker daemon 16.96MB
Step 1/5 : FROM java:8-jdk-alpine
8-jdk-alpine: Pulling from library/java
709515475419: Pull complete
38a1c0aaa6fd: Pull complete
5b58c996e33e: Pull complete
Digest: sha256:d49bf8c44670834d3dade17f8b84d709e7db47f1887f671a0e098bafa9bae49f
Status: Downloaded newer image for java:8-jdk-alpine
---> 3fd9dd82815c
Step 2/5 : COPY ./target/demo-docker-0.0.1-SNAPSHOT.jar /usr/app/
---> 9208a550a98b
Step 3/5 : WORKDIR /usr/app
---> Running in 31c435fa05a2
Removing intermediate container 31c435fa05a2
---> adc8c0999f8f
Step 4/5 : RUN sh -c 'touch demo-docker-0.0.1-SNAPSHOT.jar'
---> Running in 4894eb3036f0
Removing intermediate container 4894eb3036f0
---> a1b01ade8df8
Step 5/5 : ENTRYPOINT ["java","-jar","demo-docker-0.0.1-SNAPSHOT.jar"]
---> Running in fbb2e10ecae9
Removing intermediate container fbb2e10ecae9
---> fa4896fc6a0c
Successfully built fa4896fc6a0c
Successfully tagged interviewdot:1
Vinoths-MBP:demo-docker vinothkumar$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
interviewdot 1 fa4896fc6a0c 38 seconds ago 178MB
java 8-jdk-alpine 3fd9dd82815c 2 years ago 145MB
Vinoths-MBP:demo-docker vinothkumar$ docker run -p 8080:8080 interviewdot:1
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.3.RELEASE)
2019-04-01 04:31:58.891 INFO 1 --- [ main] c.i.demodocker.DemoDockerApplication : Starting DemoDockerApplication v0.0.1-SNAPSHOT on a01a869f87b2 with PID 1 (/usr/app/demo-docker-0.0.1-SNAPSHOT.jar started by root in /usr/app)
2019-04-01 04:31:58.894 INFO 1 --- [ main] c.i.demodocker.DemoDockerApplication : No active profile set, falling back to default profiles: default
2019-04-01 04:32:00.105 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-04-01 04:32:00.173 INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-04-01 04:32:00.174 INFO 1 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.16]
2019-04-01 04:32:00.187 INFO 1 --- [ main] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64/server:/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64:/usr/lib/jvm/java-1.8-openjdk/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]
2019-04-01 04:32:00.268 INFO 1 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-04-01 04:32:00.269 INFO 1 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1332 ms
2019-04-01 04:32:00.508 INFO 1 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2019-04-01 04:32:00.704 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2019-04-01 04:32:00.708 INFO 1 --- [ main] c.i.demodocker.DemoDockerApplication : Started DemoDockerApplication in 2.252 seconds (JVM running for 2.605)
2019-04-01 04:32:06.782 INFO 1 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-04-01 04:32:06.782 INFO 1 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2019-04-01 04:32:06.789 INFO 1 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 6 ms
Access the spring boot docker app in http://localhost:8080/docker/interviewdot :
Vinoths-MBP:demo-docker vinothkumar$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5ffad5faf3cc interviewdot:1 "java -jar demo-dock…" 10 seconds ago Up 10 seconds 0.0.0.0:8080->8080/tcp flamboyant_goldwasser
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