What is OpenShift? Containerization make possible for IT organizations to become more agile and scalable, which help them to become more efficient in application development. If we believe on Gartner’s report currently 50% of the oganizations are utilizing the power of Containerization and by 2022 its expected to reach by 75% of the organization who…
The Docker client limitations: Artifactory offers solutions to these limitations Artifactory offers solutions to these limitations allowing you to create and use any number of Docker registries. Using a Reverse Proxy When using Artifactory with a reverse proxy, you need to map Docker commands to Docker registries in Artifactory using either Ports method With the…
By default docker use https to connect to docker registry. But there can be use cases to use insecure registry. Here are the steps to use insecure registry. In ubuntuedit the file /etc/default/docker and update DOCKER_OPTS e.g where 15.206.81.210 is ipaddress of registry and 9000 is your port on which registry is configured. In CentosEdit…
Master in DevOps Engineering (MDE):- DevOps changes the landscape completely and we can observe it by this example: if you will see today in the job descriptions, you look at the developers today there is no Java developer there is no DOTNET developers there are full stack developers. All of them are powered by tools,…
Docker, an open-source technology containerization tools that use OS-level virtualization to deliver software in packages called containers. Docker designed to make it easier to create, deploy, and run applications by using containers. Docker is so widely adopted and used isn’t just the darling of Linux powers such as Red Hat and Canonical. Proprietary software companies…
Software development is not about writing code these days. Multiple languages, frameworks, architectures, and discontinuous interfaces between tools for each lifecycle stage creates huge complexities. Docker facilitate and accelerates workflow, while giving developers the freedom to innovate with their choice of tools, application stacks, and deployment environments for each project. To understand Docker – first…
Benefits and Top 10 DevOps Tools of 2020 Here i’m going to explore major benefits of top 10 DevOps tools. Better Employment Opportunities :- DevOps is more demanding in the IT sectors, DevOps adopts in everywhere IT sectors. DevOps practitioners are among the highest paid people in IT and it’s the number one most difficult…
Dear Participants, Here are the consolidated URLs of DevOps training videos/class recordings/tutorials AWS Video Tutorial – January 2020 – (PDF – Notes) Docker Video Tutorial – January 2020 Part – 1 – Video Tutorial Click here Part – 2 – Video Tutorial Click here Notes Git Video Tutorial – January 2020 Maven Video Tutorial –…
What Docker technologies are available to support communication between containers? Docker connect and bridge networks Docker linking and bridge networks (Ans) Docker connect and alias networks None of these Bridge networks can be defined in Docker Compose files. False True (Ans) What command can be run to download an image from Docker Hub? docker images…
Which of the following open-source tools is the underlying technology for Docker Swarm? containerd SwarmKit (Ans) Kubernetes InfraKit The Docker daemon Docker UCP implements RBAC via Grants. Which of the following make up a Grant? Subjects, roles, and nodes Subjects, roles, and collections (Ans) Roles and collections Which of the following built-in Docker networks creates…
Which of the following best decribes a Docker Image? A read-write template for starting one or more containers A point-in-time snapshot of a container used for backups A data volume that can be mounted inside of a container A read-only template for starting one or more containers (Ans) You have two services running on a…
Which of the following are true about Docker volumes? They must exist on a SAN or NAS They are decoupled from containers (Ans) They are higher performance than graph driver (snapshotter) storage They are RAID protected Which of the following commands will list all of the Docker volumes on a particular Docker host? docker system…
What is the preferred way to deploy and manage a Docker Stack? The declarative way via config files (Ans) The imperative way via commands Which of the following Docker Engine component is a Cloud Native Computing Foundation (CNCF) project? containerd (Ans) The Docker Remote API runc The daemon Which components constitute the control plane aspects…
Which of the following are top-level keys in a stack file (Compose v3 file)? Version, deployments, networks, volumes Version and services Version, services, networks, volumes (Ans) Services, pods, networks, volumes Which of the following is an advantage of Multi-stage Builds? Multi-platform images Better image documentation Faster image builds Smaller images (Ans) Which of the following…
Which of the following is a recommended best practice? Keep your images small (Ans) Never use the latest image in a repo Use large images containing lots of tools Only use Docker Hub Where are Secrets mounted on Linux-based Docker hosts? An encrypted volume mounted at /run/secrets An in memory (tempfs) volume at /run/secrets (Ans)…
Which of the following is needed to deploy a Docker Stack? Compose v2 file format Kubernetes Compose v3 file format Docker Cloud (Ans) What is the name of the configuration file that describes how to build a new Docker image with your app-code inside? dockerfile (Ans) config.json docker-file dockerfile.json Which of the following is the…
What type of software deals with running (placement) applications on a given node in the cluster? Placer VM runtime Container runtime Provisioner Scheduler (Ans) What is the net effect of a separate PID namespace? Each process can have an entirely separate __ . filesystem network stack hostname list of processes (Ans) How would you avoid…
What can you use to run multiple containers from a single YAML file? Dockerfile docker run docker-compose (Ans) docker run containers.yml Which of the following is not a benefit of Virtual Memory? Use more memory than is physically available Processes can use memory as if they are the only process running Compress data stored in…
If you want to perform maintenance on a node, to what availability should you change it? Ready Down Drain (Ans) Pause Active Assuming you have a stack called APIS, what is the equivalent of docker service ps for stacks? docker stack deploy docker stack ls docker stack ps APIS (Ans) docker stack services APIS When…
Which of the following will upload a new stack to your Docker Cloud account? docker-cloud stack create docker-cloud.yml docker-cloud stack create -f docker-cloud.yml (Ans) docker-cloud stack create -f dockerfile docker stack create -f docker-cloud.yml Docker Engine is: The locally installed runtime through which you administrate Docker containers (Ans) An online Docker administration interface An online…
What is the function of this command? docker search apache/ubuntu It will search your local Docker client environment for images related to either apache or ubuntu. It will search Docker Hub for images related to both apache and ubuntu. (Ans) It will search your local Docker client environment for images related to both apache and…
Which of the following are the standard secured and unsecured Docker engine daemon ports? 2375 (unsecured), 2376 (secured) (Ans) 4000 (unsecured), 4001 (secured) 3375 (unsecured), 3376 (secured) 80 (unsecured), 443 (secured) Which of the following arguments gets passed to the swarm command to join a node to the Swarm cluster? raft-join join (Ans) swarm-join cluster-join…
Where does the file system come from for a container? From a remote network share hosted through Hyper-V From the machine the container is started on From the image used to create the container (Ans) From another special container called a parent container What image type is blessed by both Docker and the people behind…
The docker history command shows output similar to which of the following? Dockerfile (Ans) docker-compose.yml docker images docker layers docker ps What is a tag? A reference to a registry A reference to a specific image in a repository (Ans) A reference to a specific image in a registry A reference to a repository What…
Is it ever possible to run a Linux-based container on a Microsoft Windows platform? Yes, Docker containers abstract away the underlying operating system, which means the container can run on top of any operating system. Yes, provided that the container is running inside a Linux-based virtual machine, courtesy of the Microsoft Hyper-V hypervisor. (Ans) No,…
Which of the following will display the specific command that created each layer in an image? docker search imagename docker images -t imagename docker history imagename (Ans) docker build -th imagename You would prepare an image called hello-world for uploading to a local Docker Registry using which of the following commands? docker tag hello-world localhost/hello-world:latest…
Here, I am going to tell you about Top 10 best DevOps Tools and Certification to Utilize In 2019 – 2020, which will be helpful for your Bright future. 1. Docker – A docker is a tool which is used to automate deployment applications in a light weight container so the application can work efficiently…
The CoreOS corporation was acquired by Red Hat in May 2018 for $250 million; post-acquisition, the main enterprise Container Linux distribution, combined with Red Hat’s similar Project Atomic, has been renamed Red Hat CoreOS, while its open source community has been aligned with the Fedora Project as Fedora CoreOS. Today, both teams(CoreOS & redhat) are…
[root@localhost ~]# systemctl restart docker Job for docker.service failed because the control process exited with error code. See “systemctl status docker.service” and “journalctl -xe” for details. [root@localhost ~]# [root@localhost ~]# journalctl -xe Oct 18 12:57:24 localhost.localdomain systemd[1]: Starting Docker Application Container Engine. — Subject: Unit docker.service has begun start-up — Defined-By: systemd — Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel —…
Step 1 – Register a free account here. https://bintray.com/ Step 2 – Login and Click on the your “username” right top corner and go to “edit profile” Step 3 – Click on “API key” tab and copy “Your API key is:” and that can be used to download the artifactory image from bintray.com ie. 543a181849465b127327a92233f63b321980f1fb…