Big multinational companies like Pokémon, eBay, Yahoo Japan, SAP, etc. use Kubernetes extensively. But there is a shortage of Kubernetes certified professionals in the market. It is one of the prime reasons why the demand for Kubernetes is high. If planning to get a job in this field, this guide will help you get a gist of how the interview would be. Here’s a list of the top 15 Kubernetes interview questions that you should prepare in advance.
What is Kubernetes?
Kubernetes is an open-source container management tool. Kubernetes was developed in the year 2014 and is a product of Google. It caters to the following –
- Container deployment,
- Scaling of containers
- Descaling of containers
- load balancing
Kubernetes manages Linux containers across the privates, hybrid, and cloud environments. Kubernetes is known to work brilliantly with all the cloud providers. Simply put, Kubernetes is not just a containerization platform but a multi-container management solution.
What are the main components of Kubernetes?
The main components of the Kubernetes are as follows –
- API server
- Controller manager
What is the relationship between Kubernetes and Docker?
Docker is a platform that aims to build runtime containers. It is mainly used for the lifecycle management of containers with a Docker image. On the other hand, Kubernetes focuses on the communication between the individual containers. In simple terms, Docker builds the containers, and these containers communicate with each other via Kubernetes. Kubernetes helps when multiple hosts have to be manually linking and orchestrated.
What is a master node?
The master node is the most critical component responsible for Kubernetes architecture. It is considered to be the central controlling unit of Kubernetes. Its job is to manage workload and also communication across the clusters.
What are the different components of a master node?
The different components of a master node are:
- Controller Manager
- API Server
What is ETCD?
It is that component that stores all the critical values and configuration details. It receives commands from other components and works accordingly. There are two other major tasks that this component is involved in: managing the network rules and posting the forwarding activity.
What is a node?
A node is the main worker machine in Kubernetes. They are addressed as “minions”. They are managed by the master and have all the necessary services required to run pods. Node run on a virtual or a physical machine.
What is the function of a controller manager?
It is that computer program that runs in a continuous loop. The main job of a controller manager is to collect and send information to the API server. All the notes, endpoints, etc., are taken care of by this component.
Explain the role of a scheduler?
A scheduler is mainly responsible for workload utilization. Another key task is to allocate the pod to a new node. The scheduler must have an idea about –
- The total resources available
- Resources are allocated to the existing workloads on each node.
What are the key features of Kubernetes?
Some of the key features are stated below –
- Kubernetes paves the way for automated scheduling.
- The high density of resource utilization is possible here
- The management is application-centric
- Kubernetes offers enterprise-ready features
- Load balancing is possible
- Allows scaling and descaling of containers
- It possesses self-healing capabilities
- All the processes related to development, testing, and production are consistent.
- Both rollouts and rollback are automated
- It is possible to create predictable infrastructure
- The infrastructure is auto-scalable.
What is the difference between Kubernetes and Docker Swarm? (This is one of the most commonly asked Kubernetes Interview questions)
Kubernetes and Docker Swarm are different in a lot of parameters. Some of them are –
- In Kubernetes, the load balancing settings are configured manually, but it is automated in the case of Docker.
- Kubernetes takes time to install, contrary to the time taken by Docker to install.
- The former has an auto-scaling feature, whereas this feature is absent in Docker.
- The installation process in the case of Kubernetes is complex. On the other hand, Docker’s installation process is easy and simple.
- GUI features are available in Kubernetes, and you’ll find them missing in the case of Docker.
What are the different types of pods you find here?
In Kubernetes, there are two types of pods – single and multiple.
What is meant by a load balancer?
In Kubernetes, a load balancer is a standard procedure that presents the service. There are two types of load balancers – internal and external. An internal load balancer balances the load automatically. Additionally, it also allocates the pods with the required configuration. Talking about the external load balancer, it directs the traffic to the backend pods.
What is the use of namespace?
The purpose of Namespace in Kubernetes is to divide the cluster resources between users.
What do you mean by a heapster?
Heapster is a cluster-wide aggregator of data. Heapster runs like a pod, just like any other pod in the cluster. It discovers all nodes in the cluster. It then queries usage information from the nodes in the cluster via an agent. In short, it helps to enable container cluster monitoring and performance analysis.
If looking to prosper in Kubernetes, make sure you grasp all the topics well and leave no stone unturned in putting effort. Above Kubernetes Interview questions will help you get an idea of how the interview would be. Prepare accordingly, and you’ll flourish for sure.