If you aspire to have a career in DevOps, you must know that Kubernetes is becoming an essential tool for DevOps engineers. And to learn to use the tool perfectly, one needs to have a Kubernetes certification from a reputed organization.
Kubernetes, for those who don’t know, is an open-source platform used to manage workload in a larger quantity. It makes managing container-based deployment easier and maintains a scale for it all. In addition, Kubernetes has an autoscaling feature that does the scaling independently, taking work off your hands and reducing any scaling errors.
If you have already trained in Docker, getting a Kubernetes certification might be unnecessary, as the two are essentially the same. You could not be more wrong. Kubernetes is a container that manages many aspects of project deployment and makes critical decisions regarding the necessity of the containers required. While Docker just provides the containers.
The best thing about learning Kubernetes right now is that you can take a free Kubernetes training course and get familiarized with the basics.
Eligibility for Kubernetes Training
The free Kubernetes training course is an excellent choice for those looking to learn the basics of Kubernetes. You will learn all the basic concepts of Kubernetes and the entire container deployment process, from installation to managing the Kubernetes cluster.
But to get into the Kubernetes certification course, you must meet some prerequisites. Here are all the things you should know before you start with Kubernetes.
- Linux Command Line Interface
Linux is the most basic system you should know about as it is the sole controller of everything that happens on your computer. So for starters, you should know how to configure applications in a Linux operating system. Learning the command line interface means you can type in any command in your system, and your computer will execute it.
- Basic knowledge of Docker
After knowing how to work Linux, one should understand what Docker is and how to work it. Docker is used to make the building process of a product smoother. Before you start learning about Kubernetes clusters and containers, you need to know what containers are and how they work. This is where the basic knowledge of Docker comes into play.
Once you learn everything about Docker, you will find learning about Kubernetes easier.
- RKT
Learning about containers means learning about RKT. Kubernetes allows RKT to be run as a container run-time backend. As RKT has security features that can benefit Kubernetes, running the application in the backend is only beneficial to the Kubernetes cluster. Learning RKT is encouraged as RKT has a well-defined surface area making it ideal for integrating with other systems.
If you have all these criteria fulfilled, you can get into a free Kubernetes training program. The skills you will be taught in a Kubernetes program are:
- Scheduling pods
- Logging and monitoring clusters
- Cluster maintenance
- Security and authentication
- DNS Networking CoreDNS CNI
- Application lifecycle management
- Storage and Management
Kubernetes interview questions that you can take a look into
Once you take the free Kubernetes training course and clear the exam to get the Kubernetes certification, your next step will be to clear the interview. So here are some commonly asked Kubernetes interview questions that might help you:
1. How are Kubernetes and Docker related?
When asked this question in a Kubernetes interview, the interviewer might want to know if you’ve worked with either or both the systems. Tell them what you know about both platforms, how docker handles software development, and Kubernetes orchestrates the entire project by linking containers and working clusters.
2. What is the difference between deploying applications on hosts and containers?
Deploying applications on hosts has been a standard process for a long time. But with containers coming into the picture now, applications can be deployed in containers much more quickly. Now, kernels and libraries are the common ground for applications in hosts. This is because so many applications would share a common library. But when deploying in containers, each application gets its library. So applications can get individual access to the programming language and system they need.
3. What are the nodes that run inside the Kubernetes?
A node is a worker machine in a cluster. They work their services to run the pods, and master components manage all these pods.
4. What are the services that a node gives and its responsibilities?
These are the services that a node carries out:
- Container run-time (starts and manages containers)
- Kubelet (receives commands from the master)
- Kube-proxy (makes services available)
5. What is the difference between Kubernetes secrets and config map?
Kubernetes secrets store sensitive information in an encrypted form like a password. Whereas config map stores data in a plain text format.
6. Is there any other way to update Config Map for Kubernetes deployment without pod restarts?
This is possible if you have a way of triggering a reload. For example, you can mount the content as volume and then, without restarting the pod, update the config map for Kubernetes.
Also read: Different uses and advantages of Data structure
conclude
Kubernetes is a potent tool for DevOps engineering. It helps manage workloads in larger quantities by clearing container clusters and working all the processes in those containers. However, one must be trained in Docker and should be able to perform the Linux operating system to get into a free Kubernetes training. This certification course will teach you the basics of Kubernetes and make it easy for you to get into advanced training.
The eligibility criteria for getting into this course are:
- Linux CLI
- Basic knowledge of Docker
- RKT
To help you prepare for the interview, we have also discussed the most common Kubernetes interview questions. These will help you prepare better and clear your interview process to be the onsite Kubernetes expert.