Kubernetes Certification Administrator Exam practice exam questions fully solved & updated.

API server Also known as:kube-apiserver The API server is a component of the Kubernetes control plane that exposes the Kubernetes API. The API server is the front end for the Kubernetes control plane. [-] The main implementation of a Kubernetes API server is kube-apiserver. kube-apiserver is designed to scale horizontally—that is, it scales by deploying more instances. You can run several instances of kube-apiserver and balance traffic between those instances. App Container Application containers (or app containers) are the containers in a pod that are started after any init containers have completed. [-] An init container lets you separate initialization details that are important for the overall workload, and that don't need to keep running once the application container has started. If a pod doesn't have any init containers configured, all the containers in that pod are app containers. Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:00 Full screen CIDR CIDR (Classless Inter-Domain Routing) is a notation for describing blocks of IP addresses and is used heavily in various networking configurations. [-] In the context of Kubernetes, each Node is assigned a range of IP addresses through the start address and a subnet mask using CIDR. This allows Nodes to assign each Pod a unique IP address. Although originally a concept for IPv4, CIDR has also been expanded to include IPv6. Cluster A set of worker machines, called nodes, that run containerized applications. Every cluster has at least one worker node. [-] The worker node(s) host the Pods that are the components of the application workload. The control plane manages the worker nodes and the Pods in the cluster. In production environments, the control plane usually runs across multiple computers and a cluster usually runs multiple nodes, providing fault-tolerance and high availability. Container A lightweight and portable executable image that contains software and all of its dependencies. [-] Containers decouple applications from underlying host infrastructure to make deployment easier in different cloud or OS environments, and for easier scaling. Control Plane The container orchestration layer that exposes the API and interfaces to define, deploy, and manage the lifecycle of containers. [-] This layer is composed by many different components, such as (but not restricted to): etcd API Server Scheduler Controller Manager Cloud Controller Manager These components can be run as traditional operating system services (daemons) or as containers. The hosts running these components were historically called masters. CronJob "1.Manages a Job that runs on a periodic schedule. 2.Similar to a linux in a crontab file 3.CronJob object specifies a schedule using the corn format DaemonSet Ensures a copy of a Pod is running across a set of nodes in a cluster. Deployment An API object that manages a replicated application, typically by running Pods with no local state. Docker Docker (specifically, Docker Engine) is a software technology providing operating-system-level virtualization also known as containers. Endpoints Endpoints track the IP addresses of Pods with matching selectors. Ephemeral Container A Container type that you can temporarily run inside a Pod. etcd Consistent and highly-available key value store used as Kubernetes' backing store for all cluster data. Image Stored instance of a Container that holds a set of software needed to run an application. Init Container One or more initialization containers that must run to completion before any app containers run. Job A finite or batch task that runs to completion. kube-controller-manager Control plane component that runs controller processes. kube-proxy kube-proxy is a network proxy that runs on each node in your cluster, implementing part of the Kubernetes Service concept kube-scheduler Control plane component that watches for newly created Pods with no assigned node, and selects a node for them to run on. Kubectl A command line tool for communicating with a Kubernetes API server. Kubernetes API The application that serves Kubernetes functionality through a RESTful interface and stores the state of the cluster. Label Tags objects with identifying attributes that are meaningful and relevant to users. Logging Logs are the list of events that are logged by cluster or application. Manifest Specification of a Kubernetes API object in JSON or YAML format. Master Legacy term, used as synonym for nodes hosting the control plane. Minikube A tool for running Kubernetes locally. Mirror Pod A pod object that a kubelet uses to represent a static pod