sujith – Best DevOps https://www.bestdevops.com Lets Learn, Do it & Share! Thats a Best DevOps!!! Fri, 04 Feb 2022 10:23:11 +0000 en-US hourly 1 https://wordpress.org/?v=7.1.3 What are the components of Kubernetes worker and explain https://www.bestdevops.com/what-are-the-components-of-kubernetes-worker-and-explain/ Wed, 01 Sep 2021 07:37:09 +0000 https://www.bestdevops.com/?p=20690
  • kubelet :An agent that runs on each node in the cluster. It makes sure that containers are running in a Pod.
  • kube-proxy :kube-proxy maintains network rules on nodes. Manage communication within the cluster and outside the cluster. Also assign ip address for pods
  • Container runtime: For managing and run the containers.
    • ]]>         What are the components of Kubernetes master and explain each component’s function? https://www.bestdevops.com/what-are-the-components-of-kubernetes-master-and-explain-each-components-function-12/ Wed, 01 Sep 2021 07:20:07 +0000 https://www.bestdevops.com/?p=20644
  • API server : It is the front end for the Kubernetes control plane, exposes the Kubernetes API. All other components interact with api server.
  • Scheduler
    This is one of the key components of Kubernetes master. It is a service in master responsible for distributing the workload.
  • Controller Manager
    Controls the Kubernetes cluster. It includes the Endpoints Controller, Replication Controller, and Namespace Controller etc
  • etcd : Consistent and highly-available key value store used as Kubernetes’ backing store for all cluster data
    • ]]>         Write down 10 fearures of Kubernetes with image https://www.bestdevops.com/write-down-10-fearures-of-kubernetes-with-image/ Wed, 01 Sep 2021 06:48:46 +0000 https://www.bestdevops.com/?p=20526
  • Container orchestration
  • Manages state of container
  • Auto healing function
  • Auto Scaling
  • Load balancing
  • Easy deployment
  • Implement the changes easily
  • Automated rollouts and rollbacks
    • ]]>         List out number of storage/volume drivers supported by docker? https://www.bestdevops.com/list-out-number-of-storage-volume-drivers-supported-by-docker-5/ Tue, 31 Aug 2021 09:43:33 +0000 https://www.bestdevops.com/?p=20433
    Azure File Storage plugin
    BeeGFS Volume Plugin
    Blockbridge plugin
    Contiv Volume Plugin
    Convoy plugin
    DigitalOcean Block Storage plugin
    DRBD plugin
    Flocker plugin
    Fuxi Volume Plugin
    gce-docker plugin
    GlusterFS plugin
    Horcrux Volume Plugin
    HPE 3Par Volume Plugin
    Infinit volume plugin
    IPFS Volume Plugin
    Keywhiz plugin
    Local Persist Plugin
    NetApp Plugin (nDVP)
    Netshare plugin
    Nimble Storage Volume Plugin
    OpenStorage Plugin
    Portworx Volume Plugin
    Quobyte Volume Plugin
    REX-Ray plugin
    Virtuozzo Storage and Ploop plugin
    VMware vSphere Storage Plugin
    ]]>         List out all INSTRUCTION statement of dockerfile and give one line explanation. https://www.bestdevops.com/list-out-all-instruction-statement-of-dockerfile-and-give-one-line-explanation-8/ Tue, 31 Aug 2021 08:37:40 +0000 https://www.bestdevops.com/?p=20391 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

    USER : Set the runtime user

    ENV : set environment variable

    CMD : to set PID1

    ENTRY POINT : to set PID1

    WORK DIR : set the working directory

    ]]>         What is Docker Images and Exaplin in 10 bullet lines? https://www.bestdevops.com/what-is-docker-images-and-exaplin-in-10-bullet-lines-6/ Tue, 31 Aug 2021 05:43:37 +0000 https://www.bestdevops.com/?p=20306
  • 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
    • ]]>         Create one Image which have base as ubuntu and with git – ntp – apache2. https://www.bestdevops.com/create-one-image-which-have-base-as-ubuntu-and-with-git-ntp-apache2-4/ Tue, 31 Aug 2021 05:36:23 +0000 https://www.bestdevops.com/?p=20271 1993 docker run -itd –name=sjt ubuntu
    1995 docker ps |grep sjt
    1998 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-ap2
    2000 docker images

    ]]>         What is Storage Driver and types of Storage Driver? Explained with Images. https://www.bestdevops.com/what-is-storage-driver-and-types-of-storage-driver-explained-with-images-5/ Tue, 31 Aug 2021 05:24:13 +0000 https://www.bestdevops.com/?p=20243 Storage drivers are used to store image layers, and to store data in the writable layer of a container. Types are overlay,overlay2,fuse-overlayfs,btrfs,zfs,vfs,aufs and devicemapper. overlay2 is the default storage driver.

    ]]>         What is the use of “docker wait” commands? with example and image https://www.bestdevops.com/what-is-the-use-of-docker-wait-commands-with-example-and-image-4/ Mon, 30 Aug 2021 11:37:08 +0000 https://www.bestdevops.com/?p=20135 docker wait command is used to block the container until the container exit. once the container is stoped, it returns the exit code (0)

    ]]>         What is the use of “docker update” commands? with example and image https://www.bestdevops.com/what-is-the-use-of-docker-update-commands-with-example-and-image-4/ Mon, 30 Aug 2021 11:27:46 +0000 https://www.bestdevops.com/?p=20116 docker update command is used to update the default configuration of a specific container.
    for example, limiting resources like memory, cpu etc

    ]]>         What is the differenece between docker pause and docker unpause? https://www.bestdevops.com/what-is-the-differenece-between-docker-pause-and-docker-unpause-2/ Mon, 30 Aug 2021 07:38:29 +0000 https://www.bestdevops.com/?p=20004 Docker pause is used to pause all the processes in the container, but the memory will be still used. Docker unpause will resume the processes.

    ]]>         What is the differenece between docker stop and docker kill? https://www.bestdevops.com/what-is-the-differenece-between-docker-stop-and-docker-kill-2/ Mon, 30 Aug 2021 07:36:57 +0000 https://www.bestdevops.com/?p=19973 Docker kill will stop all the processes in a container forcefully but docker stop will stop the processes gently.

    ]]>         What is docker container with image https://www.bestdevops.com/what-is-docker-container-with-image-2/ Mon, 30 Aug 2021 07:30:54 +0000 https://www.bestdevops.com/?p=19851 The docker container is an independent light weight environment for running an application, docker image is the package used to create, run and deploy application in containers.

    ]]>