niharkanta1/docker-training

Credit: (https://github.com/mbzama)

Installation

Please refer to this repo for instructions: docker-setup

Cheatsheet

To view active containers

   docker ps 

To view all containers

   docker ps -a

To view images

   docker images

To remove container

   docker rm -f {container_name}

To remove image

   docker rmi --image {image_name}

To view logs

   docker logs -f {container_name}
   docker logs -f {container_name} --tail 100

To clean up un-used resources

   docker system prune

For more commands please refer to this cheatsheet

Working with Volumes

Create folder and file

     mkdir data
     nano run.sh

Add this content

echo '<EMP_ID> Running run.sh file - '$(date)

Copy from Host machine to Docker Container:

docker cp /host_dir container_name:/container_dir

Copy from Docker Container to Host machine:

docker cp container_name:/container_dir /host_dir

Example:
	Copy file from host machine to container 
   		docker cp data/ container_name:/data	

 	Login to the docker container
   		docker exec -it container_name

 	Verify the file
   		ls -l data
   		cat data/run.sh

 	Run the file
   		sh run.sh

Upload image to public registry (dockerhub)

1. Create account in Docker Hub using your personal email.

2. Login to dockerhub registry from command prompt using this command:

    docker login --username={user_name} 
   

3. Tag the image

   docker tag {image_name} {user_name}/{image_name}
   

4. Upload the image to public docker registry:

   docker push {user_name}/{image_name}
   

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ALL PROJECTS

---

1_standalone

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 Build binary
 -------------
     cd 1_standalone
     mvn clean compile jar:jar

 -------------
 Run binary
 -------------
      java -jar target/standalone-1.0.jar

 -------------
 Build docker image
 -------------
      Java 8
           docker build -t java8-app .

      Java 9 
           docker build -f Dockerfile-9 -t java9-app .

      Java 10 
           docker build -f Dockerfile-10 -t java10-app .

      Java 11
           docker build -f Dockerfile-11 -t java11-app .

 -------------
 Run app as Docker container
 -------------
      Java 8
           docker run --name java8-app-c1 java8-app 

      Java 9
           docker run --name java9-app-c1 java9-app

      Java 10
           docker run --name java10-app-c1 java10-app

      Java 11
           docker run --name java11-app-c1 java11-app		

---

2_spring-boot

 -------------
 Build the executable
 -------------
 cd 2_spring-boot
 mvn -DskipTests=true package && java -jar target/spring-boot-demo-1.0.jar
   
 Access the app using
    Windows: http://192.168.99.100:8085/greet?name=zama
    Ubuntu : http://localhost:8085/greet?name=zama

 -------------
 Build docker image
 -------------
 docker build -t spring-boot-demo .

 -------------
 Run app as Docker container
 -------------
 docker run -p 9999:8085 --name springboot-c1 spring-boot-demo
   
 Access the app using
   Windows: http://192.168.99.100:9999/greet?name=zama 
   Ubuntu : http://localhost:9999/greet?name=zama

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Using Maven for docker tasks

We can use dockerfile-maven plugin from spotify for build/tag/publish docker images

To build and tag image

mvn dockerfile:build

To deploy or publish image

mvn dockerfile:push

---

Docker Compose

To build and start:

docker-compose up --build

To build:

docker-compose build

To create/run containers:

docker-compose up

To stop containers:

docker-compose stop

To stop and remove all containers:

docker-compose down

To start particular service:

docker-compose up {service_name}

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Scaling

We can scale the containers easily using docker-compose

    For standalone:
           docker-compose scale standalone=5

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Upload image to public docker registry (dockerhub)

Please refer to this