Docker

most of the commands are from the course

to create image through Dockerfile

FROM node
WORKDIR /app
COPY  ./package.json .
RUN npm install
COPY . .
EXPOSE 5123
CMD [ "node","./app.js" ]

to run this Dockerfile

docker build .

to get list of all container

docker ps

to stop this comtainer

dockere stop name_of_contaier

to remove this comtainer

dockere rm name_of_contaier

Working with images & Containers

To use prebuild images from dockerhub

docker pull image_name

To check all the `process` ps

docker ps -a

Intrective Session

docker run -it image

to create custom images

[] file extension name Dockerfile.
[] **IF WORK DIR DECLARE UPSIDE COPY THEN THE PWD WILL ALREADY WILL BE IN /APP DIR **
[] this will now run when container are created that is why we use CMD, CMD should always bee last command
[] Th expose port on the FILE EXPOSE IT"S JUST FOR COTAINER BUT TO EXPOSE FOR PC THE docker run -p 3000:5123 image_id

FROM image_name
COPY . /app                    #  sorce   destination.
WORKDIR /app                   # where to create app project
RUN npm install
EXPOSE 5123
CMD node ./server.js           # this will now run when container are created that is why we use CMD

to delete docker images

docker rmi image_id

rmi

to delete multiple docker images

docker rmi $(docker images -a)

to delete multiple docker containers

docker rm $(docker ps -a)

Read-only Containers

In Docker its layer based every thing is cachced, unless it is updated,when one layer change then all the subsequien layers are reexecuted To take a updated source code...

we dont have to install node_modules when ever updated

and for that

FROM image_name
WORKDIR /app 
 
# we will first copy package.json file
COPY ./package.json .
RUN npm install     # then we will run install, so if package.json changes then all the code wil be rexecuted
 
# then we will copy the source code
COPY . .
EXPOSE 5123
CMD node ./server.js           # this will now run when container are created that is why we use CMD

Attach mode/Detach mode

docker attach image_name

to get logs

docker logs image_name

to get follow/further logs

docker logs -f image_name

Interactive mode

Python Example

from random import randint
 
min_numbr = int(input("Please enter min number : "))
max_numbr = int(input("Please enter max number : "))
 
if (min_numbr > max_numbr ):
    print("Input in valid")
else:
    rnd_int = randint(min_numbr,max_numbr)
    print(rnd_int)

docker run --help

# you can use -it flag for taht
docker run -it container_name

to Start in attach mode anfter shutdown and to input mode `-i`

# you can use -it flag for taht
docker start -a -i container_name

Reemov dockr container automatically

by adding flag --rm

dockr run -p 5123:5123 -d --rm cont_id

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