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Kelsey Hightower
2016-07-07 08:30:15 -07:00
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docs/kubernetes-controller.md
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@@ -9,6 +9,20 @@ controller1 us-central1-f n1-standard-1 10.240.0.21 RUNNING
controller2 us-central1-f n1-standard-1 10.240.0.22 RUNNING controller2 us-central1-f n1-standard-1 10.240.0.22 RUNNING
``` ```
## Why
The Kubernetes components that make up the control plane include the following components:
* Kubernetes API Server
* Kubernetes Scheduler
* Kubernetes Controller Manager
Each component is being run on the same machines for the following reasons:
* The Scheduler and Controller Manager are tightly coupled with the API Server
* Only one Scheduler and Controller Manager can be active at a given time, but it's ok to run multiple at the same time. Each component will elect a leader via the API Server.
* Running multiple copies of each component is required for H/A
* Running each component next to the API Server eases configuration.
## Copy TLS Certs ## Copy TLS Certs