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TAKAHASHI Shuuji
2020-08-05 03:17:57 +09:00
parent 6b784ad586
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content/en/docs/concepts/overview/what-is-kubernetes.md
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@@ -59,17 +59,17 @@ That's how Kubernetes comes to the rescue! Kubernetes provides you with a framew
Kubernetes provides you with:
* **Service discovery and load balancing**
* **Service discovery and load balancing**
Kubernetes can expose a container using the DNS name or using their own IP address. If traffic to a container is high, Kubernetes is able to load balance and distribute the network traffic so that the deployment is stable.
* **Storage orchestration**
* **Storage orchestration**
Kubernetes allows you to automatically mount a storage system of your choice, such as local storages, public cloud providers, and more.
* **Automated rollouts and rollbacks**
* **Automated rollouts and rollbacks**
You can describe the desired state for your deployed containers using Kubernetes, and it can change the actual state to the desired state at a controlled rate. For example, you can automate Kubernetes to create new containers for your deployment, remove existing containers and adopt all their resources to the new container.
* **Automatic bin packing**
* **Automatic bin packing**
You provide Kubernetes with a cluster of nodes that it can use to run containerized tasks. You tell Kubernetes how much CPU and memory (RAM) each container needs. Kubernetes can fit containers onto your nodes to make the best use of your resources.
* **Self-healing**
Kubernetes restarts containers that fail, replaces containers, kills containers that don’t respond to your user-defined health check, and doesn’t advertise them to clients until they are ready to serve.
* **Secret and configuration management**
* **Self-healing**
Kubernetes restarts containers that fail, replaces containers, kills containers that don't respond to your user-defined health check, and doesn't advertise them to clients until they are ready to serve.
* **Secret and configuration management**
Kubernetes lets you store and manage sensitive information, such as passwords, OAuth tokens, and SSH keys. You can deploy and update secrets and application configuration without rebuilding your container images, and without exposing secrets in your stack configuration.
## What Kubernetes is not
@@ -84,7 +84,7 @@ Kubernetes:
* Does not dictate logging, monitoring, or alerting solutions. It provides some integrations as proof of concept, and mechanisms to collect and export metrics.
* Does not provide nor mandate a configuration language/system (for example, Jsonnet). It provides a declarative API that may be targeted by arbitrary forms of declarative specifications.
* Does not provide nor adopt any comprehensive machine configuration, maintenance, management, or self-healing systems.
* Additionally, Kubernetes is not a mere orchestration system. In fact, it eliminates the need for orchestration. The technical definition of orchestration is execution of a defined workflow: first do A, then B, then C. In contrast, Kubernetes comprises a set of independent, composable control processes that continuously drive the current state towards the provided desired state. It shouldn’t matter how you get from A to C. Centralized control is also not required. This results in a system that is easier to use and more powerful, robust, resilient, and extensible.
* Additionally, Kubernetes is not a mere orchestration system. In fact, it eliminates the need for orchestration. The technical definition of orchestration is execution of a defined workflow: first do A, then B, then C. In contrast, Kubernetes comprises a set of independent, composable control processes that continuously drive the current state towards the provided desired state. It shouldn't matter how you get from A to C. Centralized control is also not required. This results in a system that is easier to use and more powerful, robust, resilient, and extensible.