Kubernetes Flash Cards (CKA Certification) practice exam questions fully solved & updated.

Kubernetes Helps manage application with many containerized application in different development environments Monolith Services monolithic application describes a single-tiered software application in which the user interface and data access code are combined into a single program from a single platform Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:00 Full screen Microservices A software architecture that is composed of smaller modules that interact through APIs and can be updated without affecting the entire system. Orchestration Tools High Availability-no downtime Scalability-high performance Disaster Recovery-Backup Recovery Kubernetes Components -Many components -Mainly comprised of Node and Pod Node Simple server physical/virtual mchine Pod abstraction over image-one application pod container and database pod container -Pod gets it own IP address -New IP address on recreation -Die very easily Service -attached to each Pod Permanent IP address lifecycle of Pod and Service not connected Load Balancer external service Service used to access from external source, HTTP Protocol with Node IP adress and port Number-or Domain Name(Ingress) ConfigMap external configuration to application for easy changes Secret file Instead of putting in ConfigMap put data with base64 encryption for secrecy Volumes attaches physical storage to pod either local(K8s cluster-storage or remote(not part of K8s cluster) Deployment Deployment for my-app pods for replication and reliability Create or Destroy Pods based on need -Can't replicate DB StatefulSet Manage Data Inconsistencies Maintain shared Database state -why DBs is outside of K8s cluster to make StatefulSet easier Worker Machine -as mutliple nodes -3 processes must installed on every node *Kube Proxy *Container Runtime *Kublet -do actual work Master Nodes 4 processes run on every node * Control Cluster State API Server cluster gateway gatekeeper for authentication then forward request Scheduler Decides which worker pod will have component schedule based on CPU, RAM, and resources (execution by Kublet) Controller Manager detects cluster state changes-and triggers Scheduler ETCD Cluster Brain-Cluster State changes get stored in key value store Minikube All on one machine(1 Node k8s cluster) Run on Virtual Box Node runs in Virtual Box for testing purposes Kubectl Commmand Line tool for K8s cluster Client of API server Most Powerful compared to UI or API -works with Minikube or Cloud cluster