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 Docker File 1 Docker File 2 Docker File 3 Docker File 4 Docker File 5

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 2CMD/2EntryPoint Only second entry point and second cmd got executed 1CMD/1EntryPoint CMD is passed as an argument to entrypoint

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 ubuntuMAINTAINER Rajesh Kumar << rajesh@scmgalaxy.com>>ENV DEBIAN_FRONTEND=noninteractiveRUN apt-get updateRUN apt-get updateRUN apt-get -y install tzdataRUN apt-get update && apt-get install git -y && apt-get install -yq apache2ENTRYPOINT [“/bin/echo”, “Hello” && “/bin/echo”, “Second entrypoint”] FROM ubuntuMAINTAINER Rajesh Kumar << rajesh@scmgalaxy.com>>ENV DEBIAN_FRONTEND=noninteractiveRUN apt-get updateRUN apt-get -y install tzdataRUN apt-get update && apt-get install git -y &&

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/srm# cat dockerfile_multiFROM ubuntuMAINTAINER Rajesh Kumar << rajesh@scmgalaxy.com>>ENV DEBIAN_FRONTEND=noninteractiveRUN apt-get updateRUN apt-get -y install tzdataRUN apt-get install git -y && apt-get install -yq apache2CMD echo “Hello CMD kp”ENTRYPOINT [“/bin/echo”, “Hello Entry kannan”] root@ip-172-31-28-155:/home/ubuntu/srm# docker run -it image_multiHello Entry kannan /bin/sh -c echo “Hello CMD kp” root@ip-172-31-28-155:/home/ubuntu/srm# cat dockerfile_multiFROM ubuntuMAINTAINER Rajesh Kumar << rajesh@scmgalaxy.com>>ENV DEBIAN_FRONTEND=noninteractiveRUN

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 OS we require to build our apps RUN – Run command in a container created from previous line/layer ARG – Set a variable for docker file ENV – set environment for the container EXPOSE – Sepcify information port for the container and also can be used during port forwarding COPY –

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 docker file with 2 CMD, 2 ENTRYPOINT docker file with 1 CMD, 1 ENTRYPOINT

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 : Set base image MAINTAINER : Author of docker file RUN : Run the commands in new layer VAR : Used to set variable, we can re-use these variables later EXPOSE : specify port of the container COPY : Copy files to the container ADD : copy files into container and extract it

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 FROM : Set base image MAINTAINER : Author of docker file RUN : Run the commands in new layer VAR : Used to set variable, we can re-use these variables later EXPOSE : specify port of the container COPY : Copy files to the container ADD : copy files into container and extract it

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 FROMSpecifies the base image. Specified docker image will be downloaded from registry if locally not available.Eg: FROM ubuntu MAINTAINERSpecifies the meta data about the user who creates. LABELSpecifies meta data about the image. It will be in key value pair format Eg: LABEL “Application_Environment”=”Development” LABEL “Application_Support”=”LearnITGuide.net Group” EXPOSEExpose instruction is used to inform about

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 https://devopsschool.com/tutorial/docker/dockerfile/dockerfile-example-sample-lab.html Docker file Example and Sample Program – 1 Docker file Example and Sample Program – 2 Docker file Example and Sample Program – 3 Docker file Example and Sample Program – 4 Docker file Example and Sample Program – 5

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 Docker image is a collection of files systems. It will have a ROOT FS, USR FS, APP FS. ONE Copy of Docker image get attached to each Container From one Image – you can get multiple Container. Docker uses storage drivers to store image layers, and to store data in the writable layer of

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 Dockerfile commands DOCKER file Commands Details 1 FROM Taking the base image 2 MAINTAINER Creater of the dockerfile 3 RUN Run command in the container of the previous layer 4 ARG Set a variable for the dockerfile and reuse it ${var}. Scope is only during the building process. 5 EXPOSE Specifying information port for

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 https://devopsschool.com/tutorial/docker/dockerfile/dockerfile-example-sample-lab.html Docker File 1: /usr/sbin/apache2ctl specified in CMD will run in foreground as a blocking call. Docker File 2: Just exit after echoing “Hello world”. Docker File 3: Just exit after echoing “Hello”. Docker File 4: Same as ‘Docker File 1‘ except port 80 will be shown as exposed port. Docker File 5: Output

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 Dockerfile with 2 CMD, 2 ENTRYPOINT: File content: Output: Welcome to /bin/sh -c echo “DOCKER” Observations: Both CMD and ENTRYPOINT entries will be overwritten with the latest entries. That is only the last CMD and ENTRYPOINT will be taken. Also the values specified in CMD will be add as an argument to the ENTRYPOINT

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 both cmd and entry point cannot come together for a web application

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) FROM : must be the first non-comment instruction in the Dockerfileeg : FROM ubuntu2) MAINTAINER :instruction allows you to set the Author field of the generated imageseg : MAINTAINER Mani K.M mani.km@quest-global.command3) RUN : The exec form makes it possible, to RUN commands using a base image that does not contain the specified

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 – Sets the base imageMAINTAINER – Sets the author field of the generated imagesRUN – Execute commands in a new layer on top of the current image and commit the resultsCMD – Allowed only once (if many then last one takes effect)LABEL – Adds metadata to an imageEXPOSE – Informs container runtime portENV

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 Q1. List out all INSTRUCTION statement of dockerfile and give one line explanation.Environment variables are supported by the following list of instructions in the Dockerfile: ADD -> check if compressed file and copying the content to docker containerCOPY -> Just copying the content to docker containerEXTRACT -> Extract the content to specified location in