Containerizarion Lab - Docker

Write Dockerfile and run docker image to execute java program a. In interactive console mode b. In Deamon mode
Write and run docker file to run java program and the java program should write logs to the host system which is outside the container using mount (Ex: write logs to host system with path c://container/logs)
Log into docker container to see logs for debug purpose and locate jars path, locate logs path
Write and run docker file to run java program with environment variables like Port number (8081), or any logs location (c://container/logs) etc
Set up a MySQL database in a Docker container and connect it to a web application (Any database is fine)
Create docker compose file to run multiple containers like database and to run the Java program using the same docker compose file

To write Dockerfile and run docker image to execute java program

FROM openjdk:17-jdk-alpine3.13
WORKDIR /app
COPY demo-1.0.0-SNAPSHOT.jar /app/demo-1.0.0-SNAPSHOT.jar
ENTRYPOINT ["java", "-jar", "demo-1.0.0-SNAPSHOT.jar"]

First copy the jar and docker files to a folder and navigate to it

docker build -t workshop .

-t is used to tag the image

docker build -t <docker image name> <docker folder path>

For Interactive mode

docker run -p 8081:8081 workshop

workshop is the image name

-p is used to map the port from the host to the container

8081:8081 is the port mapping from the host to the container

For Daemon mode

docker run -d -p 8081:8081 workshop

-d is used to run the container in the background

To see log and jar path

docker ps

ps stands for process status

docker logs -f <container id or name>

-f is used to follow the logs

docker exec -it <container id or name> /bin/sh
ls

it is used to run the container in interactive mode

/bin/sh is the shell

To set environment variables and upload the file to a container

docker run -d -p 8081:8081 -env SERVER_PORT=8081 --env UPLOAD_DIR=/tmp/fileupload/ -v /home/fileupload:/tmp/logs <docker image name>

-e is used to set the environment variable

-v is used to mount the volume

/home/fileupload is the host path

/tmp/logs is the container path

Create a file by vim some_file.txt and write something in it

To Upload the file to the container

curl --location 'http://localhost:8081/upload' --form 'file=@some_file.txt'

To check the file in the container

docker exec -it <container id or name> /bin/sh
ls /tmp/fileupload

githubhosting/Docker_Lab

Containerizarion Lab - Docker