python2.7

yum install pip

pip install numpy

python <code name>

Python 3.7

#Download get-pip to current directory. It won't install anything, as of now

curl -O https://bootstrap.pypa.io/get-pip.py

#Use python3.6 to install pip

python3 get-pip.py

#this will install pip3 and pip3.6

yum install pip3

pip3 install numpy

python3 <code name>

Dockerfile -- > Images -- > Conatiner

docker inspect <container-id>

docker logs -f <container-id>

docker exec -it <container-id> /bin/bash

Dangling Image - Images who have no owner /orphan images

docker system prune

Remove a Image

===============

docker rmi <Image_id>

Remove a Container

==================

docker rm -f <Container_id>

docker ps -a == > show me all the container

===========================================

docker run -it --name python-app <>

docker stop <>

docker start -a -i <>

docker image prune - Unsed images are removed

docker run --rm == > remove the container once it's stopped

docker image inspect <> == > Details of the image

docker cp <on local> <container_name:/test> == > copy from local to inside container

Docker Volume : Data preservation methodology

================================

docker volume ls

docker volume create volume vol1

docker volume inspect <volume name> -- > by default storage is /var/lib/docker

docker run -it --name <any name> -v <volume on container>:<directory on host> <container id> == > docker run –it --name container1 –v vol1:/data ubuntu

this volume can be attached to multiple containers.

docker volume rm vol1

Bind Mount : Another way to share container data with host machine with location choice

===========================================================

cd tmp/logs -- > create a file.txt -- >

docker run –it –name <container name> -v /tmp/logs:/data:Z <image name>

/tmp/logs in host machine is mapped to /data on container .

Create a dockerfile :

=============

FROM ubuntu

Maintainer “Vikas”

RUN apt-get update

RUN apt-get install vim –y

CMD /bin/echo “Hello from Docker”

docker build –t <image name required> .

docker images to check the image created

Docker Network:

============

docker network ls -- > see the default networks

1. bridge 2. host 3. null

docker network inspect bridge -- > check the containers section

Different containers under same network can talk with each other via ip address

apt-get update && apt-get install –y iputils-ping

take one of the the container ip from inspect command and use it on the other one to see connectivity .

Create a custom bridge :

===============

docker network create --driver bridge <bridge name>

docker run -itd --name <container name> --network <network created > <image from hub>

Port Publishing or forwarding on Docker:

===========================

docker run -itd --name <container name> nginx

docker inspect <container name> -- > to get the IPAddress

curl ip:80 -- > get the o/p

docker run -itd --name <container name> -P nginx

docker run -itd --name <container name> -p 9999:80 nginx

Docker file is a blueprint for building image

Keywords:

FROM : Talks about the base image

ENV : Optional as environment variables are defined here .

RUN - Execute any Linux command .Execution will happen inside the container .

COPY - Source can be local, and destination is inside container

CMD – Always part of docker file . Execute entry point Linux command .

Multiple RUN commands can be there but only one CMD command .

Docker Network :

https://www.docker.com/blog/understanding-docker-networking-drivers-use-cases/

https://docs.docker.com/network/

docker network ls

docker network --help

docker network ls -f driver=bridge

docker network ls --format "{{.ID}}: {{.Driver}}"

docker network inspect "networkid"

docker network create "networkname"

docker network create -d bridge "networkname“

docker network rm “networkname”

docker network connect "networkname" "containername"

docker container run -d --name "nameofcontainer" --network "networkname" image

docker network disconnect "networkname" "containername“

Docker exec –it nginx1 bash

apt-get update

apt-get install iputils-ping

docker exec -it “nginx2" ping “nginx3"

Install docker on amazon linux :

-------------------------------

yum install docker –y

Common commands:

-------------------------

docker pull ubuntu

docker images / docker image ls

docker run –it –d ubuntu -- > attached to a container it should be in running mode .

docker ps –a /docker ps

docker run -d --name test-tomcat-server -p 8090:8080 tomcat:latest

docker exec –it <container_id> bash

docker kill <container_id>

docker rm <container id> -- > will remove the container but it should be stopped

docker rm -f <container_id> -- > delete container forcefully

docker rmi <image id> -- > to remove the image

docker rm –f $(docker ps –a –q )

docker commit

docker start <container id >

docker stop <contain ner id >

come out of atatched mode -- > ctrl +p .ctrl +q

root@df33de3dcefb:/usr/local/tomcat/webapps.dist# cp -R * ../webapps

docker exec -it tomcat-vikas /bin/bash

Create a volume to preserve the data present in container :

----------------------------------------------------------

docker volume ls -- > list

docker volume create vol1 -- > create a volume

docker volume inspect vol1 -- > see the location

docker run -it --name <any name> -v vol1:/data <container name>

docker volume rm vol1

Bind Mount :

-----------

docker run -it --name <any name> -v <bind mount location eg: /tmp/logs>:/data:Z Ubuntu -- > this Z flag will enable read write in container .

docker run -it --name <any name> --volumes-from <existing container name > Ubuntu

Docker Installation on Ubuntu machine :

--------------------------------------------

sudo apt-get update

sudo apt-get install docker.io

dockerfile :

------------

From ubuntu

Maintainer “Vikas”

RUN apt-get update

RUN apt-get install vim –y

CMD /bin/echo “ I am from ubuntu container “

To run this, say == > docker build –t myimage .