What is OpenShift ?

OpenShift is a cloud development platform as a service [ PaaS] developed by hedhat.

Developers can develop and deploy applications and services on the cloud.

It is also said that it is a container platform that works with kubernetes to help applications run more efficiently.

It is a layered system where each layer is tightly bounded with other layer using kubernetes and docker.

Its architecture is designed such a way that it can support and manage docker containers which are hosted on top off the layers using kubernetes.

q1. What is kubernetes ?

a1. Kubernetes is an open source Container orchestration engine which manages multiple docker hosts having containers running in them. It is a cluster and container management tool.

It is developed by Golang.

It is developed by Google but it was donated to Cloud Native Computing Foundation (CNCF).

Kubernetes is known for it’s profound scalability, reliability and availability.

q2. 5 Reasons for using Kubernetes.

a2. The reasons are:

1. It is a single interface to deploy containers to clouds,vms and physical machines.
2. To run cluster of hosts
3. It allocates storages for containers running
4. its a perfect load balancer
5. add advantage of self recovery

q3. Kubernetes Components

a3. As follows:

1. Kubeadm – it is an admin tool for all the components in the k8.
2. API server – functions like get, post etc. for all the services of k8 clusters.
3. ETCD – it a database storage. It stores all the data of the k8 clusters.
4. controller manager – manages and controls worker states
5. Kube proxy – assigns ip addresss, deals with the network services.
6. scheduler – assigns the tasks to the k. worker.

a1. A docker is a tool for managing container. A container is fully independent app run time environment. Managing involves :

create, start , stop, restart, pause and un-pause. Using docker we can manage containers .

Docker is a software platform which enables creating, running, distributing applications. It enables developers to package the applications that is containerization of various components. It provides consistent and isolated environments.

q2. What is a container ?

a2. Container is a fully independent isolated app run time environment It is a isolated package that contains system tools, libraries, etc. to run software applications. They do not need operating Systems. Perhaps it requires a Docker image.

We can run executable files inside the containers. The containers are very light weight that means it consumes less disk space unlike Virtual Machines. Multiple containers can be run at a time.

q3. Top 5 Advantages of Docker

a3. The advantages of Docker are :

• Provides isolated environments for running applications
• Lightweight
• It is fast and flexible. It takes seconds of work to create a container.
• Fast Development
• Automated

q4. 10 Commands used in today’s LAB.

a4. They are :

1. docker create httpd : creation of a container
2. docker ps -a : To view the list of containers already available
3. docker start container_id : start a specific container after creating it.
4. docket stop container_id : stop a specific container.
5. docker rm conatiner_id: remove a specific container. Can’t remove a container which is running currently. we need to stop it first.
6. docker exec -it container_id bash : enter inside a container.
7. docker inspect container_id : inspect specific container. It provided data like ip address etc.
8. docker run -itd docker_image: create a container of docker image ex. ubuntu
9. docker pull ubuntu : installs ubuntu
10. docker iamges : lists out the docker images available with us on system.

a1. Devops is development model that integrates every team without conflicts delivers applications and services at a higher pace. In other words it is about the collaboration and automation of processes and tasks.

q2. List the10 Advantages of devops

a2. The benefits of devops are :

1. Enables faster deployment of the product or services
2. integrates different teams
3. simplifies the development processes , reducing the development burden
4. reliable
5. flexible
6. short development cycle
7. faster recovery
8. cost effective
9. rapid delivery time
10. continuous improvement

q3. List out the top 10 development tools

a3. The top 10 devops tools as follows :

1. Jenkins
2. Docker
3. Git
4. Puppet
5. Selenium
6. Gradle
7. Slack
8. Apache Maven
9. Jira
10. Bitbucket

q4. How to implement devops ?

a4. the steps:

1. source code commit
2. build
3. unit testing
4. analysis
5. packaging and archiving
6. deployments
7. acceptance testing
8. manual test