Created an image docker run –name sree -itd centosb50dcbcba771a111bf7c0b9a08eb4f14acfb83c666b2d5f8afbc13a7afc0748eroot@ip-172-31-28-155:/home/ubuntu# docker ps|grep sreeb50dcbcba771 centos “/bin/bash” 15 seconds ago Up 14 se conds sreeroot@ip-172-31-28-155:/home/ubuntu# docker attach sreeyum install git -yyum install httpddocker commit -a”sreerekha” -m”ce-git-httpd -sree” sree ce-git-httpd-sree docker imagesREPOSITORY TAG IMAGE ID CREATED SIZEce-git-httpd-sree latest b50885a6b058 19 seconds ago 346MB docker run –name rekha -itd ce-git-httpd-sree0d9262edc8ec86f142dc3fcb0b78cd1b923f9003ca022aa4a68b258bf6b0efc9root@ip-172-31-28-155:/home/ubuntu# docker ps|grep rekha0d9262edc8ec ce-git-httpd-sree “/bin/bash” 17 seconds ago Up 16 seconds rekha docker exec rekha git –versiongit version 2.27.0

root@ip-172-31-28-155:/var/lib/docker/overlay2# docker run -itd –name anoop_centos_2 centos460aebb7de8bde42112d32e5e37df7617fb8e0588a9bdccf79f47d98357cede7 [root@ip-172-31-28-155:/var/lib/docker/overlay2# docker ps | grep anoop460aebb7de8b centos “/bin/bash” 4 seconds ago Up 3 seconds anoop_centos_2 root@ip-172-31-28-155:/var/lib/docker/overlay2# docker attach 460aebb7de8b [root@460aebb7de8b /]# yum update [root@460aebb7de8b /]# yum install git [root@460aebb7de8b /]# yum install epel-release [root@460aebb7de8b /]# yum install -y ntp –> failed [root@460aebb7de8b /]# yum install httpd [root@460aebb7de8b /]# read escape sequenceroot@ip-172-31-28-155:/var/lib/docker/overlay2# docker ps | grep anoop460aebb7de8b centos “/bin/bash” 12 minutes ago Up 12 minutes anoop_centos_2 root@ip-172-31-28-155:/var/lib/docker/overlay2# docker commit -a “anoop” -m “centos with

1.Docker Image is like a template from which we can create docker containers 2.Docker images have multiple layers 3.Writable layer is only the upper layer which will be created when we are creating a container 4.Docker images get stored in public or private repositories 5.Docker images can be created either by manually or using docker file 6.The read-only layers of an image can be shared between any container started from the same image. 7.Size is the size used by writable

• A Docker image is a file used to execute code in a Docker container.• Docker images act as a set of instructions to build a Docker container, like a template.• Docker images also act as the starting point when using Docker.• An image is comparable to a minimal lightweight snapshot in virtual machine (VM) environments.• Docker image contains application code, libraries, tools, dependencies and other files needed to make an application run.• When a user runs an image, it

root@ip-172-31-28-155:/home/ubuntu# docker commit -a”jenish” -m”jenish centos” b26fb2545c08 jenish_centossha256:bcbda5ee8c6a2c31ab6e86820c86585b033718f43d54ed17f8fd92aa46c72c3a root@ip-172-31-28-155:/home/ubuntu# docker run -itd –name jenishCentos jenish_centos

What is Storage Driver and types of Storage Driver? Explain with Images.A docker image can have different layers. When a container is created out of this image it will also have a writable layer on top of all the read only layers created out of the image. A storage driver manages all these layers making it appear as a single file system to the user. Multiple implementations of storage driver are available. What is Docker Images and Explain 10 bullet

Docker image is a collection of file system Can create multiple container from same image File systems are layered over each other Layer 0 is the base image All layers in a docker image is read only. Image layering is by Union Mounts

Storage Driver is used to store and manage images and containers on Docker host. Types of Storage Drivers aufs btrfs devicemapper vfs zfs

> Docker is a read-only template with instructions for creating a Docker container.. > An image may be an independent or may be based on other image with some customization. > It is a file which is used to execute the code in Docker container. >The docker image runs only in the docker platform. >A Docker image contains application code, libraries, tools, dependencies and other files needed to make an application run >It might be a group of files or

Collection of file systems, ROOTFS, APPFS, USERFS. One copy of docker image can attach to many containers. From one image multiple containers can be created File system layered over each other. Higher layer wins. Each layer is each File system Layer 0 should be base image or Root FS Once image is attached to container, these layers will be attached to the container as a single layer The layers in the image will be in read only format, and to

Docker image is a file to run code in container. It contains all the file/software that you needed to run your application. It has multiple layers. Each layer is originated from the prev. layer. The top layer is editable. We can create images out of existing images. We can add the lib or changes that we need and commit it.

docker run –name vin_centos -itd centos:latestdocker psdocker attach 083fb828fcad docker psdocker commit -a”Vineesh” -m”Updated Centos” 083fb828fcad vineesh_centos2docker imagesdocker run –name Vineesh_Centos2 -itd 32083f4af9bedocker psdocker exec a9c938de7bdb git

root@ip-172-31-28-155:/var/lib/docker# docker run -itd –name anoop_ubuntu_base ubuntubcba3eb8cfb3d221c9f8f753a65c86ee5ea924d8c69438342d3e83d429d572a9root@ip-172-31-28-155:/var/lib/docker# docker ps | grep anoopbcba3eb8cfb3 ubuntu “bash” 5 seconds ago Up 4 seconds anoop_ubuntu_baseroot@ip-172-31-28-155:/var/lib/docker# docker attach bcba3eb8cfb3 root@bcba3eb8cfb3:/# apt-get update root@bcba3eb8cfb3:/# apt-get install git root@bcba3eb8cfb3:/# apt-get install httpd root@bcba3eb8cfb3:/# apt-get install mini-httpd root@bcba3eb8cfb3:/# which git/usr/bin/git root@bcba3eb8cfb3:/# mini_httpdbind: Address already in use root@bcba3eb8cfb3:/# apt-get install ntpReading package lists… Done root@ip-172-31-28-155:/var/lib/docker# docker ps | grep anoopbcba3eb8cfb3 ubuntu “bash” 6 minutes ago Up 6 minutes anoop_ubuntu_base root@ip-172-31-28-155:/var/lib/docker# docker commit -a “anoop” -m “ubuntu with git, ntp

created an image docker commit -a”jenish” -m”jenish” 1dc3e53e3e54 jenish_ubu docker run -itd jenish_ubu

The Linux kernel device drivers are, essentially, a shared library of privileged, memory resident, low level hardware handling routines. It is Linux’s device drivers that handle the peculiarities of the devices they are managing. One of the basic features of is that it abstracts the handling of devices The following is a list of the types of docker storage driver which can be configured and their use case: • overlay2 – This is the preferred storage driver for all Linux distributions• aufs –

1993 docker run -itd –name=sjt ubuntu1995 docker ps |grep sjt1998 docker attach sjt apt-get update apt-get install git apt-get install ntp apt-get install apache2 1999 docker commit -a”Sujith Sunny” -m”ub-up-git-ap2″ sjt ub-up-git-ap22000 docker images