Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now FROM – creates a layer from the base imageeg : FROM ubuntu:18.04 MAINTAINER – The MAINTAINER instruction allows you to set the Author field of the generated images.RUN – builds your application with makeeg : RUN make /appCMD – specifies what command to run within the containerLABEL – The LABEL instruction adds metadata to

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now FROM: The FROM instruction initializes a new build stage and sets the Base Image for subsequent instructionsRUN: The RUN instruction will execute any commands in a new layer on top of the current image and commit the results.MAINTAINER: The MAINTAINER instruction sets the Author field of the generated images.EXPOSE: The EXPOSE instruction informs Docker

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now Sceraniro 1 2 CMD – the last CMD will override the first one Scenario 2 2 EntryPoint – the last ENTRYPOINT will override the first one Scenario 3 1 ENTRYPOINT and 1CMD – Entrypoint will override CMD

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now FROM – Mention a docker image name. Ex: FROM ubuntu MAINTAINER – Mention about the author who create the docker file. Ex: MAINTAINER BittoKC RUN – To execute any command on the container. Ex: RUN touch /tmp/file1.txt ARG – To set an environment variable. Ex: ARG USER1 gehc_security EXPOSE – To specify about the

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now FROM – to specify the parent image. Eg ubuntu from which you create an imageMAINTAINER – to set the author/creater of the imageRUN – to run a command like shell script in linux or execute a programARG – should be used along with FROM to speficy any arguments lie versionEXPOSE – To inform the

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now Test1: docker run 27d064e1c81aHEllo from second entrypoint /bin/sh -c echo “Hello world from second cmd” Test2: root@ip-172-31-28-155:/home/ubuntu/raju# docker run 27d064e1c81a echo testHEllo from second entrypoint echo test Explanation: Only the second cmd or entrypoint is being considered. Moreover if we try to replace cmd during run time then second entrypoint and run time cmd

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now FROM – First command inside a docker file and Creates the base image. MAINTANER – Sets the author info of docker file. RUN – Runs command in the container of previous layer ARG -Sets the variable EXPORT -Expose a port COPY – Copies a file to the container ADD – copies a files from

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now FROM -It should be the first instruction in the Dockerfile. It is used to specify our base layer from which we are creating the image. MAINTAINER – It is used to set the author. RUN – It is used to run a command in shell. CMD – It provides a default executable for a

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now FROM – base image to start creating the new image RUN – Run command in a container created from previous line/layer ARG – Set a variable for docker file execution and reuse using $(varname) ENV – Meta layer to set environment for the container EXPOSE – Sepcify information port for the container and also

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now Storage driver is a software that allows you to write data to the writable layer of your Docker container. Types of storage driver • overlay2 – This is the preferred storage driver for all Linux distributions• aufs – Preferred driver for earlier versions of Docker, when running on an earlier version of Ubuntu.• devicemapper

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now 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

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now 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

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now 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

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now • 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

Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now 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

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Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now 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

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