Docker Contd
- Applications bring revenue to enterprises and to run applications we need servers, os etc
Lets create a linux server and install tomcat in it
- Create a linux server (AWS/Azure/GCP)
- We have experimented in the linux vm
- network interface gives network connectivity
- cpu, ram and disk are available
- to install softwares we have used package manager apt
- Commands
sudo apt update
sudo apt install net-tools openjdk-11-jdk tomcat9 -y
# to check network
ifconfig
# to check java
java -version
# to check tomcat
sudo systemctl status tomcat9
- We were able to exactly the similar operations inside container as well.
Let me take a application
- This is spring pet clinic application
- Lets try to run this application on linux
- Refer Here
- To build the code
sudo apt update
sudo apt install openjdk-17-jdk maven -y
git clone https://github.com/spring-projects/spring-petclinic.git
cd spring-petclinic
# java package
mvn package
java -jar target/spring-petclinic-3.0.0-SNAPSHOT.jar
- Docker way of working
- We create a docker image (docker packaging format)
- We need to create Dockerfile
- push the image to registry (docker hub)
- create the container using the image anywhere
- Dockerfile
FROM amazoncorretto:17-alpine-jdk
LABEL author=khaja
ADD target/spring-petclinic-3.0.0-SNAPSHOT.jar /springpetclinic.jar
EXPOSE 8080
CMD ["java", "-jar", "/springpetclinic.jar"]
docker image build -t spc:1.0 .
docker container run -d -P spc:1.0
docker container run -d -P spc:1.0
docker container run -d -P spc:1.0
Next Steps
- How is container able to give ip address/storage/process/cpu/ram etc
- Container architectures (3 versions)
- understanding image and container
- docker container life cycle
- containerization
- networking , storage aspects
