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Move the Job controller example

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Move the job controller example so that the example of Job controller follows
immediately after the concept of what a job controller does in introduced.
This commit is contained in:
Prasad Katti
2020-03-31 19:55:24 -07:00
parent 1f6c464cb7
commit e8719723dc
1 changed files with 4 additions and 6 deletions
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content/en/docs/concepts/architecture/controller.md
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@@ -113,17 +113,15 @@ useful changes, it doesn't matter if the overall state is or is not stable.
As a tenet of its design, Kubernetes uses lots of controllers that each manage As a tenet of its design, Kubernetes uses lots of controllers that each manage
a particular aspect of cluster state. Most commonly, a particular control loop a particular aspect of cluster state. Most commonly, a particular control loop
(controller) uses one kind of resource as its desired state, and has a different (controller) uses one kind of resource as its desired state, and has a different
kind of resource that it manages to make that desired state happen. kind of resource that it manages to make that desired state happen. For example,
a controller for Jobs tracks Job objects (to discover new work) and Pod objects
(to run the Jobs, and then to see when the work is finished). In this case
something else creates the Jobs, whereas the Job controller creates Pods.
It's useful to have simple controllers rather than one, monolithic set of control It's useful to have simple controllers rather than one, monolithic set of control
loops that are interlinked. Controllers can fail, so Kubernetes is designed to loops that are interlinked. Controllers can fail, so Kubernetes is designed to
allow for that. allow for that.
For example: a controller for Jobs tracks Job objects (to discover
new work) and Pod object (to run the Jobs, and then to see when the work is
finished). In this case something else creates the Jobs, whereas the Job
controller creates Pods.
{{< note >}} {{< note >}}
There can be several controllers that create or update the same kind of object. There can be several controllers that create or update the same kind of object.
Behind the scenes, Kubernetes controllers make sure that they only pay attention Behind the scenes, Kubernetes controllers make sure that they only pay attention