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DAY10.md

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basic commands

tac reverse the file data

  • command qrencode generate qr code

Topic - DOCKER

virtual box

  • create a virtual hardware
  • os need hardware so virtual box create virtual hardware for os

DOCKER

  1. same as virtual box create a virtual hardware
  2. its use the base machine kernal
  3. create a os for particular application
  4. here os called container
  5. every container has its own ip, mac address and everything that a os has.
  6. Docker is a platform provider/technology provider

steps for launch instance on docker

  1. shellinabox (download it) for cent os7
  2. go to binary pacage url
  3. copy link
  4. switch on aws instance root sudo -i
  5. command ---> rpm -ivh [link]
  6. command `` systemct1 start shellinabox
  7. command systemct1 enable shellinaboxauto start the shellinabox
  8. command --> setenforce 0
  9. remove enforcing and write disable
  10. vim /etc/selinux /

selinux is a port

Docker

  • apt get install docker *
  • command --> `` systemctl status docker(check the status of docker)
  • command docker versioncheck version
  • Docker language -- Go
  • Docker need Docker image as a iso image
  • check docker image on Docker Hubwebsite
  • search using command docker search name-of-technology
  • pull image docker pull hello-world
  • docker images images that you made

Docker Containers

  • fedora is a backend product of redhat

steps of making container

  • command docker run -it fedora date i-->interactive t--> terminal
  • check shut down container command --> docker ps -a show all container

facts

  • docker os shutdown automticaly when we stop our work

  • its a single process oriented system

  • if we dont want to stop our container docker run -it fedora bash

  • ew can also give the namedocker run -it --name p1 fedora bash

  • exec go inside a running container docker exec -it c1 bash and left container in running state

  • start stop docker container docker start container-name

  • docker ps command show only running container *if we wants to jump on running container from our bash machine command docker attach container-name

  • container is isolated (they cant conflict)

docker concepts

  1. pull
  2. images
  3. ps
  4. search
  5. run
  6. exec
  7. start
  8. stop

command

  • command docker rm name remove docker image
  • command docker ps -aq show container id
  • command docker rm $(docker pa -qa) remove all containers
  • command ```docker rm -f $(docker pa -qa)`` also remove running container