session-54.txt

volumes:
- unnamed
- named

-v host-path:container-path

docker run -d -p 80:80 -v /home/ec2-user/nginx-data:/usr/share/nginx/html nginx

1GB app 

single flat 2400 sqft --> only one room --> one family

6GB apps are also running in containers

Multi stage builds --> Java apps

JDK --> Java development kit
JRE --> Java runtime environment

JDK > JRE

JDK = JRE + development tools

Developers develop java apps in JDK environment, once you get build package. no need to dev environment


app code --> compile[JDK] --> java bytecode(build file) .jar, .war [JDK]

run bytecode --> app is up [JRE]

layer1 --> FROM nginx
layer2 --> FROM nginx+RUN rm -rf /usr/share/nginx/html/index.html --> create image

create layer2 container from layer2 image

layer3 image = layer2+RUN rm -rf /etc/nginx/nginx.conf

create layer3 container from layer3 image

layer4 image=layer3+RUN rm -rf /etc/nginx/conf.d/default.conf


FROM nginx
RUN rm -rf /usr/share/nginx/html/index.html
RUN rm -rf /etc/nginx/nginx.conf
RUN rm -rf /etc/nginx/conf.d/default.conf
USER nginx


FROM nginx
RUN rm -rf /usr/share/nginx/html/index.html