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 ReplicaSets Definition – It is a Kubernetes object that maintains the number of pods (i.e. replicas of a given pod) and checks if the current number of pods are matching the desired number specified for the figure given in replicasets. Advantage – 1.Its powerful – since at any point of time you can manage

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 Essential Components Kubernetes initially developed by Google and now an Open source project in CNCF. It has following major components Kubernetes Master Kubernetes Worker aka Minion aka Node Workstation usage – Kubectl Kubernetes Master It is the control plane of the cluster – it receives request for the desired state of the cluster

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 Demystifying Kubernetes Kubernetes (aka k8s) helps solves multi fold problems we can face while putting an application that’s required to scale while on production. It is mainly used as an orchestrator of containers in a cluster environment (i.e. multi-node environment for distributed applications). The following are the problems and the role it plays in

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 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 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 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

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 Difference between docker kill/stop For docker kill – process exits with a bad status code – 137 For docker stop – process exits with a good status code – 0 That validates what is specified in the documentation that for docker kill – process is terminated unexpectedly whereas for docker stop – process is

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 ? Docker is a tool and a platform to simplify the way we create apps and deploy them. Its based on containerization and since its more light weight, cuts across platforms it is being used all across the industry. It allows :- To create docker images where we store our app