Kubernetes for the Absolute Beginners - Hands-On - Replication Controllers and ReplicaSets

This video tutorial explains the concepts of replication controllers and replica sets in Kubernetes. It covers the need for replication controllers to ensure high availability and load balancing by running multiple pod instances. The tutorial also differentiates between replication controllers and replica sets, highlighting the latter as the newer technology. It provides a step-by-step guide on creating replication controllers and replica sets, including YAML file structure and the importance of selectors. Finally, it discusses scaling replica sets and managing them effectively.

What is the primary purpose of a replication controller in Kubernetes?

• To provide security for applications

• To ensure high availability by running multiple pod instances

• To manage network traffic

• To monitor CPU usage

How does a replication controller help when a single pod fails?

• It restarts the failed pod

• It automatically creates a new pod to replace the failed one

• It sends an alert to the administrator

• It logs the failure for future reference

What is the first step in creating a replication controller?

• Configuring security settings

• Defining the number of replicas

• Creating a replication controller definition file

• Setting up network policies

Which section in the replication controller definition file specifies the number of pod replicas?

• Spec

• API version

• Metadata

• Kind

What is a key difference between a replication controller and a replica set?

• Replication controller supports more pods

• Replica set requires a selector definition

• Replication controller is faster

• Replica set is used for networking

Why are labels important in Kubernetes?

• They are used for logging purposes

• They help in identifying and managing pods

• They increase the speed of the cluster

• They provide security to the pods

How does a replica set use labels to manage pods?

• By matching labels to identify which pods to monitor

• By encrypting the pod data

• By assigning network policies

• By setting up security protocols

What is one way to scale a replica set in Kubernetes?

• By updating the number of replicas in the definition file

• By increasing the CPU allocation

• By adding more nodes to the cluster

• By changing the network settings

Which command is used to create a replica set in Kubernetes?

• kubectl apply

• kubectl start

• kubectl create

• kubectl deploy

What happens if you scale a replica set using the kubectl scale command?

• The number of replicas in the definition file is updated

• The number of replicas in the cluster is updated, but not in the file

• The cluster is restarted

• The pods are deleted and recreated