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Questions and Answers
What does a deployment in Kubernetes describe?
Why are rolling updates important in Kubernetes?
What happens to application instances when a new deployment revision is applied?
How are new Pods scheduled during a rolling update?
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What is the primary benefit of rolling updates in Kubernetes?
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What happens to Pods during a rolling update?
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Why are deployments important in Kubernetes?
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What is the result of a successful rolling update?
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Why are users of Kubernetes applications concerned about deployment strategies?
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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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Description
This quiz covers the administration of orchestration solution using Kubernetes, including YAML, namespaces, pods, replica sets, labels, selectors, deployment, and updates. Practice your knowledge of Kubernetes cluster administration.
