Podcast
Questions and Answers
What does a deployment in Kubernetes describe?
What does a deployment in Kubernetes describe?
- The scheduling of Pods
- The allocation of resources
- The configuration of a Node
- The life cycle of an application (correct)
Why are rolling updates important in Kubernetes?
Why are rolling updates important in Kubernetes?
- To reduce resource utilization
- To improve application security
- To ensure zero downtime during deployments (correct)
- To simplify Pod management
What happens to application instances when a new deployment revision is applied?
What happens to application instances when a new deployment revision is applied?
- They are restarted
- They are upgraded (correct)
- They are rolled back
- They are terminated
How are new Pods scheduled during a rolling update?
How are new Pods scheduled during a rolling update?
What is the primary benefit of rolling updates in Kubernetes?
What is the primary benefit of rolling updates in Kubernetes?
What happens to Pods during a rolling update?
What happens to Pods during a rolling update?
Why are deployments important in Kubernetes?
Why are deployments important in Kubernetes?
What is the result of a successful rolling update?
What is the result of a successful rolling update?
Why are users of Kubernetes applications concerned about deployment strategies?
Why are users of Kubernetes applications concerned about deployment strategies?
What is the purpose of a deployment in Kubernetes?
What is the purpose of a deployment in Kubernetes?
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Study Notes
Kubernetes Administration
- Understand the basic concepts related to the administration of orchestration solution (Kubernetes)
- Practice administration operations on a Kubernetes cluster
YAML
- YAML (YAML Ain't Markup Language) is a human-readable data-serialization language
- Commonly used for configuration files and in applications where data is being stored or transmitted
Namespaces
- Provide a mechanism for isolating groups of resources within a single cluster
- Resource names need to be unique within a namespace, but not across namespaces
- Intended for use in environments with many users spread across multiple teams or projects
- Divide cluster resources between multiple users
Default Namespaces
- default: The default namespace for objects with no other namespace
- kube-system: The namespace for objects created by the Kubernetes system
- kube-public: A namespace created automatically, readable by all users, and mostly reserved for cluster usage
- kube-node-lease: Holds Lease objects associated with each node, allowing the kubelet to send heartbeats for node failure detection
Pod Administration
- Pods can be set up using YAML files as inputs for creating Kubernetes objects
- Pods can be assigned to a namespace using two options
Replication Controllers
- Ensure a specified number of replicas of a pod are running at all times
- Instantiate or delete pods to match the desired number
- Provide high availability, load balancing, and scaling capabilities
Replication Controllers Definition
- Consists of the number of replicas desired and a pod definition for creating a replicated pod
ReplicaSet
- A Kubernetes object that ensures a specified number of replicas of a pod are running at all times
Labels and Selectors
- Used to filter and select objects in a Kubernetes cluster
Deployment
- A resource object in Kubernetes that provides declarative updates to applications
- Describes an application's life cycle, including image usage, pod number, and update strategy
Deployment Updates and Rollbacks
- Allow for zero-downtime updates by incrementally updating pods with new instances
- Rolling updates can be rolled back to a previous deployment revision if needed
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