Docker: Spring boot: Hello World

Step 1: Create a directory ‘helloworld’.

Step 2: Navigate to ‘helloworld’ folder and clone following git repository ‘https://github.com/harikrishna553/docker_spring_boot.git’.

$mkdir helloworld
$
$cd helloworld/
$
$git clone https://github.com/harikrishna553/docker_spring_boot.git
Cloning into 'docker_spring_boot'...
remote: Enumerating objects: 14, done.
remote: Counting objects: 100% (14/14), done.
remote: Compressing objects: 100% (8/8), done.
remote: Total 14 (delta 0), reused 14 (delta 0), pack-reused 0
Unpacking objects: 100% (14/14), done.
$
$
$ls
docker_spring_boot

Step 3: Create Dockerfile in helloworld folder.

$touch Dockerfile
$
$ls
Dockerfile  docker_spring_boot

Dockerfile

FROM maven:3.5.2-jdk-8-alpine AS maven_build
  
COPY ./docker_spring_boot /data/docker_spring_boot

WORKDIR /data/docker_spring_boot

RUN ["mvn", "clean", "install"]

CMD ["java", "-jar", "target/dockerHello-1.jar"]

Step 4: Build the image.

Navigate to the folder where Dockerfile is located and execute the below command.

docker build -t spring_hello .

$docker images
REPOSITORY                         TAG                 IMAGE ID            CREATED             SIZE
spring_hello                       latest              baef228e1fa2        3 minutes ago       571MB
sleep_me                           latest              49913f3eae6d        2 hours ago         88.9MB

Step 5: Run the container by executing below command.

docker run -p 9090:1234 spring_hello

$docker run -p 9090:1234 spring_hello

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.6.RELEASE)

2019-08-31 15:58:54.192  INFO 1 --- [           main] com.sample.app.App                       : Starting App v1 on 24d1cf90bf04 with PID 1 (/data/docker_spring_boot/target/dockerHello-1.jar started by root in /data/docker_spring_boot)
2019-08-31 15:58:54.198  INFO 1 --- [           main] com.sample.app.App                       : No active profile set, falling back to default profiles: default
2019-08-31 15:58:55.786  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 1234 (http)
2019-08-31 15:58:55.827  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-08-31 15:58:55.827  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.21]
2019-08-31 15:58:55.995  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-08-31 15:58:55.995  INFO 1 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1718 ms
2019-08-31 15:58:56.419  INFO 1 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-08-31 15:58:56.860  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 1234 (http) with context path ''
2019-08-31 15:58:56.866  INFO 1 --- [           main] com.sample.app.App                       : Started App in 3.231 seconds (JVM running for 3.909)
2019-08-31 15:58:59.712  INFO 1 --- [nio-1234-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-08-31 15:58:59.712  INFO 1 --- [nio-1234-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2019-08-31 15:58:59.723  INFO 1 --- [nio-1234-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 11 ms

Open the url ‘http://localhost:9090/’ in browser, you can see below kind of screen.

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