list docker images
docker image lsdocker images command
docker images
NOTE:
To see which images are present locally, use the "docker images" command:
REPOSITORY TAG IMAGE ID CREATED SIZE
debian jessie f50f9524513f 5 days ago 125.1 MB
debian latest f50f9524513f 5 days ago 125.1 MBwhat is docker image
what is container?
Basically docker is a super light-weight
Virtual machine which has all necessery
programs and dependencies in order to run
your program. When we setup big application
which has UI, database, and lots of
microservices we need to do a setup and
each of this services need some kind of program
to work like JAVA and so on. And to setup
everything and installing correctly in the
new server probably would take days.
But most of the time versions are not matching
and other problems so you need to debug it
which is very time consuming. So what dockers
is doing, we create image and we are explaining
what exactly is needed for our program.
So basically we are saying these are the dependencies,
this is our program where it's coming from and
than we we need to create a container with
our program we just pulling from Docker registry.
And container with a program will be running and
it can be bootsrap in few seconds. So we just
download and start in few seconds and
whoever will be requesting that image will
have exactly same setup. Biggest advantage of
dockers is to ability to have exactly same
setup everywhere and also you can very quickly
bootstrap the whole infrastructure.
And containers can build very quickly.docker image
FROM node:14
# Create app directory
WORKDIR /usr/src/app
# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./
RUN npm install
# If you are building your code for production
# RUN npm ci --only=production
# Bundle app source
COPY . .
EXPOSE 8080
CMD [ "node", "server.js" ]docker images
docker imagesdocker images
$sudo docker images [OPTIONS] [REPOSITORY[:TAG]]Copyright © 2021 Codeinu
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