Tamil How To Create Secrets in Kubernetes Demo | Tamil Kubernetes Tutorial | InterviewDOT

Kubernetes Interview Question - What is Kubernetes Secrets ? How to create secrets in Kubernetes ?

Tamil How To Create Secrets in Kubernetes Demo | Tamil Kubernetes Tutorial | InterviewDOT

A Kubernetes secret is a resource for safely storing small chunks of data such as ssl certificate and keys, database passwords or ssh keys from and access it from a Kubernetes pod. It is similar to a configMap, which does not aim to be protected, only smaller (max 1MB) and encoded (base64).

A secret is stored in the ETCD. ETCD stands for "/etc directory", the place where configuration files are stored on Linux systems. It is a distributed key-value store used for storing data across a large number of nodes. A secret belongs to a namespace and can only be accessed by pods within it.

Kubernetes (K8s) is an open-source system for automating deployment, scaling, and management of containerized applications.

Kubernetes is a portable, extensible, open-source platform for managing containerized workloads and services, that facilitates both declarative configuration and automation. It has a large, rapidly growing ecosystem. Kubernetes services, support, and tools are widely available.

The name Kubernetes originates from Greek, meaning helmsman or pilot. Google open-sourced the Kubernetes project in 2014. Kubernetes builds upon a decade and a half of experience that Google has with running production workloads at scale, combined with best-of-breed ideas and practices from the community.

Containers have become popular because they provide extra benefits, such as:

Agile application creation and deployment: increased ease and efficiency of container image creation compared to VM image use.
Continuous development, integration, and deployment: provides for reliable and frequent container image build and deployment with quick and easy rollbacks (due to image immutability).
Dev and Ops separation of concerns: create application container images at build/release time rather than deployment time, thereby decoupling applications from infrastructure.
Observability not only surfaces OS-level information and metrics, but also application health and other signals.
Environmental consistency across development, testing, and production: Runs the same on a laptop as it does in the cloud.
Cloud and OS distribution portability: Runs on Ubuntu, RHEL, CoreOS, on-prem, Google Kubernetes Engine, and anywhere else.
Application-centric management: Raises the level of abstraction from running an OS on virtual hardware to running an application on an OS using logical resources.
Loosely coupled, distributed, elastic, liberated micro-services: applications are broken into smaller, independent pieces and can be deployed and managed dynamically – not a monolithic stack running on one big single-purpose machine.
Resource isolation: predictable application performance.
Resource utilization: high efficiency and density.

Why you need Kubernetes and what can it do
Containers are a good way to bundle and run your applications. In a production environment, you need to manage the containers that run the applications and ensure that there is no downtime. For example, if a container goes down, another container needs to start. Wouldn’t it be easier if this behavior was handled by a system?

That’s how Kubernetes comes to the rescue! Kubernetes provides you with a framework to run distributed systems resiliently. It takes care of scaling and failover for your application, provides deployment patterns, and more. For example, Kubernetes can easily manage a canary deployment for your system.

Kubernetes provides you with:

Service discovery and load balancing
Kubernetes can expose a container using the DNS name or using their own IP address. If traffic to a container is high, Kubernetes is able to load balance and distribute the network traffic so that the deployment is stable.
Storage orchestration

[Vivekvikki]

Super bro.. yesterday blue green is super.. next deployment types podunga..

[rajilakshmi]

Hi, this session was very useful. When we create a pod . Sometimes status of container is not running state.what should we do to change container status to running state?

[antonyjebinraj]

sir oru doubt system to system ah minikube and docker images sa connect panna mudiyuma ? mudiyum na yepadi?

[rajeshdheenan]

Hi Vinoth, What happen when username.txt and password.txt file delete manually at os level? Please clarify the dought