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Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications. It provides a platform for managing containerized workloads and services, enabling you to deploy and manage applications at scale. Kubernetes is a powerful tool for managing containerized applications, but it can be complex to get started with. This cheat sheet provides an overview of the key concepts, topics, and categories related to Kubernetes management, and is designed to help you get started with Kubernetes.
Kubernetes is built around a set of core concepts that are used to manage containerized applications. These concepts include:
Nodes: Nodes are the physical or virtual machines that run your applications. Each node runs a container runtime, such as Docker, and is managed by the Kubernetes control plane.
Pods: Pods are the smallest deployable units in Kubernetes. A pod is a logical host for one or more containers, and provides a shared network namespace and storage volumes for the containers.
Services: Services provide a stable IP address and DNS name for a set of pods. Services enable you to expose your application to the network and provide load balancing and service discovery.
Deployments: Deployments manage the deployment and scaling of your application. A deployment defines a desired state for your application, and Kubernetes ensures that the actual state matches the desired state.
ConfigMaps: ConfigMaps provide a way to store configuration data in Kubernetes. ConfigMaps can be used to store environment variables, configuration files, and other data that your application needs.
Secrets: Secrets provide a way to store sensitive information in Kubernetes, such as passwords and API keys. Secrets are encrypted at rest and can be mounted as files or environment variables in your application.
Kubernetes is a complex platform with many different topics to learn. Some of the key topics related to Kubernetes management include:
Installation: Installing Kubernetes can be a complex process, depending on your environment and requirements. There are many different installation methods available, including using a cloud provider, using a managed Kubernetes service, or installing Kubernetes on your own infrastructure.
Configuration: Once you have installed Kubernetes, you will need to configure it to meet your requirements. This includes configuring networking, storage, and security settings.
Application Deployment: Deploying applications to Kubernetes involves creating a deployment, defining a pod template, and configuring services and ingress rules.
Scaling: Kubernetes provides several mechanisms for scaling your application, including horizontal pod autoscaling and cluster autoscaling.
Monitoring: Monitoring your Kubernetes cluster and applications is critical for ensuring the health and performance of your system. Kubernetes provides several built-in monitoring tools, such as the Kubernetes Dashboard and Prometheus.
Logging: Logging is important for troubleshooting and debugging your applications. Kubernetes provides several logging mechanisms, including the Kubernetes API server logs, container logs, and cluster-level logs.
Security: Kubernetes provides several security features, such as RBAC (Role-Based Access Control), network policies, and secrets management. It is important to understand these features and how to configure them to ensure the security of your applications.
Kubernetes can be divided into several different categories based on the functionality it provides. Some of the key categories related to Kubernetes management include:
Cluster Management: Cluster management involves managing the Kubernetes control plane and worker nodes. This includes installing and configuring Kubernetes, upgrading the cluster, and managing node resources.
Application Management: Application management involves deploying and managing applications on Kubernetes. This includes creating deployments, managing pods, configuring services, and scaling applications.
Networking: Networking is a critical component of Kubernetes, as it enables communication between pods and services. Kubernetes provides several networking options, including the Kubernetes Service Network, Container Network Interface (CNI), and Ingress.
Storage: Kubernetes provides several storage options for your applications, including local storage, network-attached storage (NAS), and cloud storage. Understanding these options and how to configure them is important for managing your applications.
Security: Security is a critical aspect of Kubernetes management, as it involves protecting your applications and data from unauthorized access. Kubernetes provides several security features, including RBAC, network policies, and secrets management.
Monitoring and Logging: Monitoring and logging are important for ensuring the health and performance of your applications. Kubernetes provides several built-in monitoring and logging tools, such as the Kubernetes Dashboard and Prometheus.
Kubernetes is a powerful platform for managing containerized applications, but it can be complex to get started with. This cheat sheet provides an overview of the key concepts, topics, and categories related to Kubernetes management, and is designed to help you get started with Kubernetes. By understanding these concepts and topics, you can begin to deploy and manage your applications on Kubernetes with confidence.
Common Terms, Definitions and Jargon1. Kubernetes: An open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications.
2. Container: A lightweight, standalone executable package that contains everything needed to run an application, including code, libraries, and dependencies.
3. Pod: The smallest deployable unit in Kubernetes, consisting of one or more containers that share the same network namespace and storage volumes.
4. Node: A physical or virtual machine that runs Kubernetes and hosts one or more pods.
5. Cluster: A group of nodes that work together to run Kubernetes and manage the deployment, scaling, and management of containerized applications.
6. Deployment: A Kubernetes object that defines how many replicas of a pod should be running at any given time, and how to update the pod when a new version is available.
7. Service: A Kubernetes object that provides a stable IP address and DNS name for a set of pods, allowing other pods and services to communicate with them.
8. Ingress: A Kubernetes object that manages external access to a cluster, routing traffic to the appropriate service based on the requested URL.
9. Namespace: A way to partition a Kubernetes cluster into multiple virtual clusters, each with its own set of resources and access controls.
10. ConfigMap: A Kubernetes object that stores configuration data as key-value pairs, allowing pods to access the data as environment variables or files.
11. Secret: A Kubernetes object that stores sensitive data, such as passwords or API keys, in an encrypted form.
12. Volume: A way to provide persistent storage to a pod, allowing data to survive across pod restarts and node failures.
13. StatefulSet: A Kubernetes object that manages the deployment and scaling of stateful applications, such as databases, by ensuring that each pod has a unique identity and stable network identity.
14. DaemonSet: A Kubernetes object that ensures that a specific pod is running on every node in the cluster, typically used for system-level services such as logging or monitoring.
15. Job: A Kubernetes object that runs a batch job to completion, such as data processing or backups, and then terminates.
16. CronJob: A Kubernetes object that runs a batch job on a regular schedule, such as nightly backups or weekly reports.
17. HorizontalPodAutoscaler: A Kubernetes object that automatically scales the number of replicas of a pod based on CPU utilization or other metrics.
18. VerticalPodAutoscaler: A Kubernetes object that automatically adjusts the resource requests and limits of a pod based on its actual resource usage.
19. CustomResourceDefinition: A Kubernetes object that defines a new custom resource type, allowing users to extend the Kubernetes API with their own objects and controllers.
20. Operator: A Kubernetes controller that manages the lifecycle of a custom resource, automating tasks such as deployment, scaling, and upgrades.
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