Kubernetes ReplicaSets, DaemonSets & StatefulSets Explained | Auto-Scaling & Self-Healing Pods!
Want to keep your Kubernetes workloads running efficiently? In this hands-on demo, we break down Kubernetes ReplicaSets, DaemonSets, and StatefulSets—three key controllers that manage auto-scaling, self-healing, and high availability in Kubernetes clusters.
⏱️ Timestamps:
ReplicaSets (00:00 - 11:24)
• ReplicaSets ensure a specified number of identical pods for self-healing and load distribution
• Controllers maintain desired state by continuously monitoring and reconciling differences
• ReplicaSets use labels to identify and manage specific pods
• ReplicaSet spec includes replicas count, selector, and pod template
• Self-healing feature automatically recreates failed pods
️ Creating and Managing ReplicaSets (11:25 - 22:13)
• kubectl apply command used to create ReplicaSets
• kubectl get rs and kubectl describe rs commands for viewing ReplicaSet information
• Demonstrated self-healing by deleting a pod and observing automatic recreation
• Manual scaling options: modifying YAML file, using kubectl edit, or kubectl scale command
DaemonSets (22:13 - 31:38)
• DaemonSets ensure one pod runs on every node in the cluster
• Used for monitoring, log collection, and other cluster-wide tasks
• DaemonSet controller automatically adjusts to node additions/removals
• DaemonSet spec similar to ReplicaSet, but without replicas field
• Taints and tolerations introduced for controlling pod placement on nodes
Stateful Applications and StatefulSets (31:38 - 40:42)
• StatefulSets used for managing stateful applications like databases
• Provides ordered, graceful deployment and unique network identifiers for pods
• Explained database replication setup (master-slave configuration)
• StatefulSets maintain sticky identity for pods, even after failures
• Ordinal index used for naming pods (e.g., mysql-0, mysql-1, mysql-2)
StatefulSet Features and Headless Services (40:42 - 51:09)
• Headless services used with StatefulSets for DNS record creation
• Volume claim templates allow unique storage for each StatefulSet pod
• Example of MySQL StatefulSet setup with primary and replica configuration
• StatefulSets provide features for managing complex stateful applications
• Brief mention of how to register for further learning sessions
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