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Introduction to Kubernetes (Extended Session) - Brent Laster
Learn the fundamentals of Kubernetes, a container orchestration system, including containers, images, nodes, services, and more, and understand how to manage and deploy applications at scale.
- Kubernetes is designed to provision software in a containerized environment, with containers providing a thin, read-write layer on top of an immutable, read-only base image.
- A container is a self-contained unit of computing, which can run anywhere the OS can run, and provides an isolated environment for the application.
- Containers are typically built from an image, which is a collection of layered files, with each layer representing a specific change or update to the base image.
- Kubernetes uses container orchestration, which involves automating the creation, scaling, and management of containers, and provides a common platform for deploying and managing applications across multiple environments.
- The kubelet is the agent responsible for managing the containers on each node, and interact with the API server to obtain the configuration and instructions for the containers.
- The API server is responsible for managing the state of the cluster, and provides a single interface for managing and configuring the containers.
- Labels are used to attach arbitrary metadata to objects in the cluster, allowing for filtering, sorting, and scaling of clusters.
- Deployments automatically manage the rollout of new versions of an application, and provide self-healing capabilities to ensure that the application is always available.
- Services provide a network identity and load balancing for accessing applications in the cluster.
- Namespaces provide a form of isolation and segmentation within the cluster, and can be used to separate development, testing, and production environments.
- Roles and role bindings are used to manage access and permissions within the cluster, providing a way to control who can interact with which resources.
- The cluster role binding lists the roles assigned to a user or group, and the cluster role lists the roles that can be assigned to users or groups.
- A cluster has a set of nodes that can be used to run containers, and the nodeport service allows the exposure of containers to the outside world.
- The manifest file is used to define the configuration of the cluster, and the apply command is used to apply the changes to the cluster.
- Config maps are used to store and manage configuration data in the cluster, and secrets are used to store sensitive data such as passwords and API keys.
- The kubectl command-line tool is used to interact with the cluster, and provides a interface for creating, managing, and scaling containers and services in the cluster.
- Kubernetes provides a number of built-in tools and features that can be used to manage the cluster, including the kubectl command-line tool, the API server, and the Kubernetes dashboard.
- Kubernetes is open-source software, and has been released under the Apache 2.0 license.