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 Kubernetes is an open-source platform that enables automated deployment, scaling, and management of containers and containerized applications. It can be used on-premises or in the cloud. Common use cases of k8s include hybrid and multi clouds, creation of vendor-agnostic serverless platforms, or deployment of self-healing and scaling services. While k8s is not the only

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 Multiple services can be defined and run together making it easier to run. Can make all the services up and down at a time. Can make even a single service up/down Multiple isolated environments on a single host Preserve volume data when containers are created Only recreate containers that have changed Variables and moving

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.Compose is a tool for defining and running multi-container Docker applications 2. A YAML file is used to configure all the application services 3. With a single command the services can be created and started using the defined configurations 4. Compose has command to start , stop and rebuild services. 5. docker-compose can be

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. Main feature – Put configuration of all App Layers in 1 place Specify logically as “Services” all the docker containers needed for different parts of your overall application.For ex: – WebApp, Business service, DB Layer and even the networking needed along with necessary information like ports. Also can specify which service depends on

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 Multiple isolated environments on a single host Preserve volume data when containers are created Only recreate containers that have changed Variables and moving a composition between environments Orchestrate multiple containers that work together Single host deployment  Quick and easy configuration – Due to YAML scripts. High productivity – Docker Compose reduces the time 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 Multiple isolated environments on a single hostCompose uses a project name to isolate environments from each other. You can make use of this project name in several different contexts: on a dev host, to create multiple copies of a single environment, such as when you want to run a stable copy for each feature

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 Helps in building the common utility (yaml files) to describe the servicess and use it in a single command YAML files are readable Helps to perform operations on all the containers in a single command Single host deployment Quick and easy configurations Highly productive – save time

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 Runs multiple containers from a single file and allows common access a) docker-compose run: run file b) docker-compose create: create services c) docker-compose stop: stop services d) docker-compose up: create and run e) docker-compose down: stop f) docker-compose rm g) docker-compose ps h) docker-compose push i) docker-compose pull

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-compose pull Performs the docker pull for all the services with respective images mentioned docker-compose create Executes the docker create for all the service (create container for all the service) docker-compose run Executes the docker create for all the service (run container for all the services) docker-compose up It combines build, create, run commands

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 compose is used for running multiple container as 1 service Each service is isolated from one another No dependency to start each service independently one yaml file contains all and can be run in 1 shot Docker manages single container , docker-compose manages multiple applications It is a powerful tool , to set

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 tmpfs mount is temporary, and only persisted in the host memory. When the container stops, the tmpfs mount is removed, and files written there won’t be persisted. This is useful to temporarily store sensitive files that you don’t want to persist in either the host or the container writable layer

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 tmpfs ? Assign memory from host’s RAM to the container which is normally outside of the write-able memory that the container gets when its created and run. This memory will eventually get removed once container lifecyle ends How to create tmpfs ? Command to mount on /app in container with permission 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 This is in-memory file system Tt will not be seen anywhere in the host/container filesystem This volume cannot be shared among containers Once container is stopped/restarted stored info will be lost It is recommended to use for high speed temporary storage

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 5 Differences between CMD and ENTRYPOINT with example CMD Entrypoint the executable command will be replaced by the command 1. The executable command can’t be changedgiven while running the container We can’t pass the arguments for the CMD command 2. The commands passed while running the container will be appended to the RUN command

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 docker update and docker wait? Explain with example commands. update : Update configuration of one or more containers docker update f4d703072499 Wait : wait Block until one or more containers stop, then print their exit codes docker wait f4d703072499 CMD ENTRYPOINT Can be overridden Cannot be overridden Cannot append additional params Can

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 5 Differences CMD Entrypoint It can be replaced by commandin docker run Ex:-[root@ip-172-31-17-58 sample3]# docker run -it test-sample1 /bin/bashroot@373fb5615122:/# Although dockerfile had CMD /usr/sbin/apache2ctl -D FOREGROUND If attempted to be replaced via docker run commandit will instead be added as a run time argument to actual entry point commandEx:-[root@ip-172-31-17-58 sample3]# docker run test-sample3 /bin/bashHello

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 about if you 2 CMD? It will remove the intermediate container and take the latest changes. FROM ubuntu MAINTAINER Rajesh Kumar << rajesh@scmgalaxy.com>> ENV DEBIAN_FRONTEND=noninteractive RUN apt-get update RUN apt-get -y install tzdata RUN apt-get install git -y && apt-get install -yq apache2 CMD echo “Hello world” CMD echo “Hi” result: Hi Last

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 CMD ENTRYPOINT Can be overridden Cannot be overridden Cannot append additional params Can be appended Command to run when container starts or arg to ENTRYPOINT if specified Always first command to run when container starts Multiple times can be added in the dockerfile but the last line will override the previous Same behavior as

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 docker update and docker wait? Explain with example commands. Docker Update:Update the container configuration like cpu, memory, restart policy, etc. docker update –kernel-memory 512M rameshdocker update –restart=on-failure:3 rameshdocker update –cpus 2 rameshdocker update –restart=no ramesh Docker Wait: Block until one or more containers stop, then print their exit codes. docker wait ramesh127docker

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 docker update ? We can change the configurations of an already running container which is observed by the docker server for > 10 seconds in the following test which we are going to run using the restart policy. Then went inside the container using bash and killed it using process id 1