omololevy / docker

Docker for Beginners - Learn Docker in 5 Steps

Docker in 5 Steps

Let's learn Docker in 5 Easy Steps.

Watch the Video Now - https://www.youtube.com/watch?v=Rt5G5Gj7RP0

• Step 00 - Installing Docker
• Step 01 - A simple Docker use case - Run an existing application
• Step 02 - Playing with Docker - Containers and Images
• Step 03 - How does Docker work?
• Step 04 - Manually creating a docker image
• Step 05 - Dockerizing a Spring Boot Application using Dockerfile and Spotify Maven Plugin

Step 00 - Installing Docker

• https://docs.docker.com/install/

Step 01 - A Simple Docker User Case - Run an existing application

• https://hub.docker.com/u/in28min

docker run -d -p 5000:5000 in28min/todo-rest-api-h2:1.0.0.RELEASE

docker run -d -p 8761:8761 springcloud/eureka

docker run -d -e MYSQL_ROOT_PASSWORD=dummypassword -e MYSQL_USER=todos-user -e MYSQL_PASSWORD=dummytodos -e MYSQL_DATABASE=todos --p 3306:3306 mysql:5.7

Traditional Deployment

Deployment with Docker

Step 02 - Playing with Docker - Containers and Images

• Image is static
• Container is dynamic

  649  docker run in28min/todo-rest-api-h2:1.0.0.RELEASE
  650  docker run -p 5000:5000 in28min/todo-rest-api-h2:1.0.0.RELEASE
  651  clear
  652  docker run -p 8761:8761 springcloud/eureka
  653  clear
  654  docker run -d -p 5000:5000 in28min/todo-rest-api-h2:1.0.0.RELEASE
  655  docker run -d -p 8761:8761 springcloud/eureka
  656  docker images
  657  docker containers 
  658  docker containers ls
  659  docker container
  660  docker container ls
  661  docker container ls -l
  662  docker container ls -l
  663  docker container ls
  664  docker container ls -a
  665  clear
  666  docker container ls -a
  667  docker container start fed549e69e9d
  668  docker container ls
  669  docker container stop tender_ardinghelli
  670  docker container ls
  671  docker container ls -a
  672  clear
  673  docker container ls -a
  674  docker container start c165f459e7d7
  675  docker container stop 151a77679241
  676  docker container start c165f459e7d7
  677  docker container logs c165f459e7d7
  678  docker container logs c165f459e7d7
  679  docker container logs c165f459e7d7
  680  docker container logs c165f459e7d7
  681  docker container ls
  682  docker container ls -a
  683  docker container rm fed549e69e9d
  684  docker container ls -a
  685  docker container prune
  686  docker container ls -a
  687  docker container inspect 0967ba7aa180
  688  docker images
  689  docker image history f8049a029560
  690  clear
  691  docker images
  692  docker image history in28min/todo-rest-api-h2
  693  docker image history in28min/todo-rest-api-h2:1.0.0.RELEASE
  694  docker images
  695  docker image remove f8049a029560
  696  docker image remove 3094afcbdf12
  697  docker container stop c165f459e7d7
  698  docker image remove 3094afcbdf12
  699  docker container rm c165f459e7d7
  700  docker image remove 3094afcbdf12
  701  docker images
  702  docker containers ls
  703  docker container ls
  704  docker container ls -a

Step 03 - How does Docker work?

Docker Architecture

Step 04 - Manually creating a new docker image

  716  docker run -dit openjdk:8-jdk-alpine
  720  docker container cp target/docker-in-5-steps-todo-rest-api-h2-1.0.0.RELEASE.jar 28d5e5d893fdb1530e9920ff66fee252adc834a8b572b77b3fdf7d316730127c:/tmp
  725  docker container exec romantic_aryabhata ls /tmp
    734  docker container commit romantic_aryabhata in28min/manual-todo-rest-api:v1
  735  docker container commit --change='CMD ["java","-jar","/tmp/docker-in-5-steps-todo-rest-api-h2-1.0.0.RELEASE.jar"]' romantic_aryabhata in28min/manual-todo-rest-api:v2
  743  docker run -d -p 5000:5000 in28min/manual-todo-rest-api:v2

Step 05 : Containerizing Spring Boot Application using Dockerfile and Spotify Maven Plugin

Run com.in28minutes.rest.webservices.restfulwebservices.RestfulWebServicesApplication as a Java Application.

• mvn package
• docker run -d -p 5000:5000 in28min/docker-in-5-steps-todo-rest-api-h2:1.0.0.RELEASE
• docker login
• docker push in28min/docker-in-5-steps-todo-rest-api-h2:1.0.0.RELEASE

Troubleshooting

• Problem - Caused by: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: java.io.IOException: No such file or directory
• Solution - Check if docker is up and running!
• Problem - Error creating the Docker image on MacOS - java.io.IOException: Cannot run program “docker-credential-osxkeychain”: error=2, No such file or directory
• Solution - https://medium.com/@dakshika/error-creating-the-docker-image-on-macos-wso2-enterprise-integrator-tooling-dfb5b537b44e

Creating Containers

To test execute API at http://localhost:5000/users/in28minutes/todos.

docker login

Hello World URLS

• http://localhost:5000/hello-world

Hello World

• http://localhost:5000/hello-world-bean

{"message":"Hello World - Changed"}

• http://localhost:5000/hello-world/path-variable/in28minutes

{"message":"Hello World, in28minutes"}

Todo JPA Resource URLs

• GET - http://localhost:5000/jpa/users/in28minutes/todos

[
  {
    "id": 10001,
    "username": "in28minutes",
    "description": "Learn JPA",
    "targetDate": "2019-06-27T06:30:30.696+0000",
    "done": false
  },
  {
    "id": 10002,
    "username": "in28minutes",
    "description": "Learn Data JPA",
    "targetDate": "2019-06-27T06:30:30.700+0000",
    "done": false
  },
  {
    "id": 10003,
    "username": "in28minutes",
    "description": "Learn Microservices",
    "targetDate": "2019-06-27T06:30:30.701+0000",
    "done": false
  }
]

Retrieve a specific todo

• GET - http://localhost:5000/jpa/users/in28minutes/todos/10001

{
  "id": 10001,
  "username": "in28minutes",
  "description": "Learn JPA",
  "targetDate": "2019-06-27T06:30:30.696+0000",
  "done": false
}

Creating a new todo

• POST to http://localhost:5000/jpa/users/in28minutes/todos with BODY of Request given below

{
  "username": "in28minutes",
  "description": "Learn to Drive a Car",
  "targetDate": "2030-11-09T10:49:23.566+0000",
  "done": false
}

Updating a new todo

• http://localhost:5000/jpa/users/in28minutes/todos/10001 with BODY of Request given below

{
  "id": 10001,
  "username": "in28minutes",
  "description": "Learn to Drive a Car",
  "targetDate": "2045-11-09T10:49:23.566+0000",
  "done": false
}

Delete todo

• DELETE to http://localhost:5000/jpa/users/in28minutes/todos/10001

H2 Console

• http://localhost:5000/h2-console
• Use jdbc:h2:mem:testdb as JDBC URL