• 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

Ideally, very little data is written to a container’s writable layer, and you use Docker volumes to write data. However, some workloads require you to be able to write to the container’s writable layer. This is where storage drivers come in.

All layers in a docker image is Read only. All layers in an image is merged to one layer while creating the container.. Docker image is a collection of files systems. A docker image is a template for docker container. One docker image can be used to create multiple containers File systems are layered over each other Layer 0 have the root filesystem Each layer in image will have 40 character length UUID generated by SHA 256 algorithm.

What is Docker Images and Explain in 10 bullet lines? Collection of file systems One copy of docker image get attached to each container. From one image multiple containers can be created Layered structure 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 image will be on read only format, and to have

Steps docker run –name aji_4 -itd centosattach to ityum install gityum install httpd yum install epel-releaseyum install -y ntp