Docker - Spin up Continer then Site

This post is very useful for those who are familiar with Docker.Will also help them who are at their beginner stage in learning docker.

As you all know,Docker is the best choice when we try to test/manage some applications in various versions or environments.

Here I am giving an example of Spinning up a NGINX container to bring a java HelloWorld application up.

In my next post, I will give you the internals of Docker Networking.

Prerequisites for this is to have Docker and Java installed in your environment.

- Create Hello World java code

public  class HelloJeevanWorld
{

  public static void main(String[] args)

{

    System.out.println("Hello Jeevan World");

  }

}

- Build it

- create manifest file to create HelloJeevanWorld.java

- Create a DockerFile with below content

---------------------------------------------------

FROM java:8

CMD mkdir -p /tmp/Jeevan/ 

WORKDIR /tmp/Jeevan

COPY HelloJeevanWorld.java /tmp/Jeevan/

EXPOSE 8080

CMD java -jar HelloJeevanWorld.java

------------------------------------------------- 

Here from attribute pulls mentioned image from docker hub/registry

CMD runs as a unix command to create a directory

WORKDIR denotes the docker working folder

COPY makes copying of java artifact from docker host to image so that it would be

avilable to container

EXPOSE exposes container to use it on port 8080.You can do it while running docker

 run even as 8080:8080 (in format external port : container posrt) 

CMD in last line to run java file

-Build docker java image using this DockerFile by below which created a image which

 you can see by executing docker images

docker build -t JeevanHelloWorld .

-Spin up  container using 

docker run JeevanHelloWorld

-You can access this using http://dockerhostip:8080/ from browser

   In the next posts I will discuss about Docker Port forwarding, using nginx reverse 

proxy for docker hosted applications, creating doc networks and spinning up containers within the range of specific ip address.

Thanks for visiting.

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