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client-go: use retry util in CRUD example

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This updates the create-update-delete-deployment example with the following:
Make use of client-go retry util in Update() steps instead of simple for loops.
Using RetryOnConflict is generally better practice as it won't become stuck in a retry loop and uses exponential backoff to prevent exhausting the apiserver.
Instead of changing annotations to demonstrate Updates/Rollbacks, change the container image as it is less confusing for readers and a better real-world example.
Improve comments and README to reflect above changes.

Signed-off-by: John Kelly <jekohk@gmail.com>

Kubernetes-commit: 94f5bcf6f77d5b35074dfab47b5de37096d8ee00
This commit is contained in:
John Kelly
2017-10-05 19:07:57 -04:00
committed by Kubernetes Publisher
parent 4e80b27156
commit ddf6c35ca5
3 changed files with 39 additions and 55 deletions
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21
examples/create-update-delete-deployment/README.md
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@@ -29,18 +29,19 @@ Now, run this application on your workstation with your local kubeconfig file:
Running this command will execute the following operations on your cluster:
1. **Create Deployment:** This will create a 2 replica Deployment with
annotation `fizz=buzz`. Verify with `kubectl get pods`.
1. **Create Deployment:** This will create a 2 replica Deployment. Verify with
`kubectl get pods`.
2. **Update Deployment:** This will update the Deployment resource created in
previous step to set the replica count to 1 and update annotations. You are
encouraged to inspect the retry loop that handles conflicts. Verify the new
replica count and `foo=bar` annotation with `kubectl describe deployment
demo`.
previous step by setting the replica count to 1 and changing the container
image to `nginx:1.13`. You are encouraged to inspect the retry loop that
handles conflicts. Verify the new replica count and container image with
`kubectl describe deployment demo`.
3. **Rollback Deployment:** This will rollback the Deployment to the last
revision, in this case the revision created in Step 1. Use `kubectl describe`
to verify the original annotation `fizz=buzz`. Also note the replica count
is still 1; this is because a Deployment revision is created if and only
if the Deployment's pod template (`.spec.template`) is changed.
revision. In this case, it's the revision that was created in Step 1.
Use `kubectl describe` to verify the container image is now `nginx:1.12`.
Also note that the Deployment's replica count is still 1; this is because a
Deployment revision is created if and only if the Deployment's pod template
(`.spec.template`) is changed.
4. **List Deployments:** This will retrieve Deployments in the `default`
namespace and print their names and replica counts.
5. **Delete Deployment:** This will delete the Deployment object and its