Скачать или смотреть Kubernetes Storage EXPLAINED | EmptyDir & HostPath

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This video on "Kubernetes Storage (EmptyDir & HostPath)" covers essential storage options within Kubernetes clusters to ensure data integrity during system failures. The session introduced storage provisioners and the Container Storage Interface (CSI), emphasizing that multiple storage providers can be used. It explained EmptyDir (temporary, lifecycle-dependent storage for caches and temp databases) and HostPath (persistent but node-dependent storage). Participants learned to configure volumes in YAML, set volume mounts, and saw live demos. Key warnings included EmptyDir’s resource risks and HostPath’s practical applications, providing a solid foundation for Kubernetes storage management.
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➡️What You’ll Learn Today:

Introduction to Kubernetes Storage (00:00 - 05:15)
✅ Storage is critical along with system and network in cluster environments
✅ Applications require persistent storage even during system issues
✅ Topics: storage provisioners, CSI, persistent volumes
✅ CSI functions like CNI for storage
✅ Multiple storage providers through appropriate CSIs

Types of Kubernetes Storage (05:15 - 12:27)
✅ Two basic types: EmptyDir and HostPath
✅ EmptyDir: Temporary storage for pod lifecycle; data removed on restart
✅ Use cases: caches, buffers, temporary databases, logs
✅ HostPath: Persistent storage, survives pod recreation
✅ Limitation: Node failure leads to loss of HostPath data

Volume Configuration in YAML (12:27 - 18:57)
✅ Volumes defined in pod specs alongside containers
✅ Mounting volumes to container paths
✅ Example: DaemonSet using HostPath to mount logs
✅ Multiple mounts for logs, data, configurations
✅ Example: EmptyDir with busybox for temporary storage

EmptyDir Demonstration (18:57 - 23:20)
✅ Created pod with EmptyDir mounted at /data
✅ Stored on worker node under /var/lib/kubelet
✅ Warning: EmptyDir can fill root directory
✅ Files deleted when pod is deleted/recreated
✅ Cluster admins manage space, but can't directly delete EmptyDir

HostPath Implementation (23:20 - 33:14)
✅ HostPath uses directories on nodes for persistent storage
✅ Created directory at /mnt/data on worker node
✅ YAML modified to use hostPath at /mnt/data
✅ Kubernetes creates the directory if it doesn’t exist
✅ Different hostPath types: Default, Directory, DirectoryOrCreate, FileOrCreate
✅ Demonstrated hostPath types with practical examples
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