Docker learning

[DevShivmohan]

Installing docker in Parrot OS

• We need to update our system then type command sudo apt-get update.
• Install docker type command sudo apt-get install docker.io.
• Now docker installed.
• To test that it installed or not then type command sudo docker pull hello-world.
• And run it type command sudo docker run hello-world.
• Then its get looks like the below screenshot

[DevShivmohan]

Docker hub link - Link

• Pulling images from docker hub -
  • Syntax sudo docker pull <image_name>.
  • i.e. sudo docker pull openjdk.
• Run docker images -
  • Syntax sudo docker run <image_name>
  • i.e. sudo docker run mysql
  • Interactive mode synatx sudo docker --name <any_name> -it -d <image_id/name> [ Its run in non-terminable state ]
  • i.e. run via image id sudo --name javaContainer -it -d fd6c6c612537
  • i.e. run via image name sudo --name javaContainer -it -d openjdk
• To show all images in our local system -
  • Type sudo docker images.
• Search docker images -
  • Syntax sudo docker search <image_name>
  • i.e. sudo docker search openjdk

[DevShivmohan]

Login to docker hub

• Docker login with username and token docker login Username : Password :

Push docker images local to docker hub and run

• Build the docker image docker build -f Dockerfile -t <image_name>:<tag> . Where tag is optional, If used anywhere then followed this type of syntax with image name, default tag is latest. OR
• Build the docker image docker build -f Dockerfile -t <image_name> .
• Build the docker image docker build -t <image_name>:<tag> .
• Link your local Image with docker hub repository
  • docker tag <imageName> <username>/<repositoryname>
  • docker tag mydockerapp docker5003/javatechonline_repo

• Push image to dockerhub repository

  • docker push <username>/<repositoryname>:<tagname>
  • docker push docker5003/javatechonline_repo:latest

• Pull image from dockerhub repository

  • docker pull <username>/<repositoryname>:<tagname>
  • docker pull docker5003/javatechonline_repo:latest

• Run docker image

  • docker run -p <docker_container_port>:<project_port> <image_name>
  • docker run -p 9900:8080 mydockerapp
  • docker run --name <container_name> -it -d <image_name> run in container detach mode.
  • docker run --name <container_name> -it -p <container_port>:<project_port> -d <image_name> run in container detach mode deployement model.
  • docker logs <container_name> to show the logs of running project.
  • docker ps to show the running images.
  • docker ps -a to show all the running/stoped images.
  • docker stop <container_name> to stop the service which can be started on a port.
  • When we hit API's of the given project port then we need to docker_container_port for hiting api's instead of project_port.
  • Docker container port mapped to the project port.

• Remove docker images

  • Remove image docker image rm [OPTIONS] IMAGE [IMAGE...]
  • i.e. docker image rm shiv default latest tag
  • i.e. docker image rm shiv:1.2
  • i.e. docker image rm shiv:1.2 --force delete forcely if any conflicts.

[DevShivmohan]

Spring boot project in docker i.e.

In Dockerfile we keep these code

FROM ubuntu:latest
FROM openjdk:17
WORKDIR /usr/src/tx-rx-server
COPY /target/tx-rx-server.jar /usr/src/tx-rx-server/
EXPOSE 8090
ENTRYPOINT ["java","-jar","tx-rx-server.jar"]

[DevShivmohan]

Max flow rate delta p - Dec192022115706-Trial-Dec192022-115440.xlsx

Min flow rate delta P - Dec192022123712-Trial-Dec192022-123057.xlsx

Viscus liquid -

Min flow rate -

Dec192022131449-Trial-Dec192022-130839.xlsx

MAX-

Dec192022133833-Trial-Dec192022-133319.xlsx

[DevShivmohan]

File upload in Spring boot with Docker container

Steps for Host configuration

• Create a directory in your host system i.e. sudo mkdir /home/storage/
• Transfer the ownership to docker of this directory sudo chown -R root:docker /home/storage/
• Give the read/write/execute permission to the directory sudo chmod -R 777 /home/storage/.

Steps for docker container configuration/Spring boot

• Define the upload directory path like this /home/storage/ in Spring boot project.
• Build docker image.
• Run docker image syntax docker run --name <container_name> -v <host_machine_path>:<docker_container_path> -it -p <container_port>:<project_port> -d <image_name>.
• Run docker image i.e. docker run --name file-upload -v /home/storage:/home/storage -it -p 8080:8085 -d file_upload

[DevShivmohan]

Open MySQL CLI bash of a running container

• Pull MySQL server image - docker pull mysql/mysql-server:latest
• Run MySQL image in container docker run --name mysql_server -d mysql/mysql-server:latest
• View MySQL root default password docker logs mysql_server
• 
• Run bash in running container docker exec -it mysql_server bash
• Now you are in bash mode
• For MySQL type command mysql -uroot -p and then paste auto generated password.
• Now you can not execute any command in mysql.
• Need to change user password.
• Type command ALTER USER 'root'@'localhost' IDENTIFIED BY '[newpassword]';
• Now we can execute any mysql command.
• For more details configuration please Click here.

[DevShivmohan]

Open ubuntu as a CLI in a docker container

• Pull Ubuntu with specified tag docker pull ubuntu:20.04
• Run it with interactive mode [ bash ] - docker run -ti --rm ubuntu /bin/bash
• Now you are in Ubuntu OS.
• 

[DevShivmohan]

Kubernetes run and forword to port

• Run cluster type command kubectl apply -f <kubernetes_yaml_file>.
• Spring boot app [project] port 8090.
• Get running pods kubectl get pods then copy name of the cluster.
• Forwording application port to the cluster type command kubectl port-forword <cluster_name> <cluster_port>:<project_port>
• Now you can access it via during API calls;
• For more info please refer this Link;
• To stop the all pods and delete it type command kubectl delete all --all --namespace default
• Now all resources will be deleted;