f191346f95
Upgrade metrics-server helm charts version from 3.11.0 to 3.12.0
and metrics-server image version from 0.6.4 to 0.7.0.
The new version supports k8s 1.24 - 1.29.
Furthermore, the name of the example application, which was in
the singular, and the readme, which was inconsistent, were corrected.
Test Plan:
PASS: Build package
PASS: App upload/apply/update/remove/delete
PASS: Check application version
PASS: Run sample application
Story: 2010681
Task: 49567
Change-Id: Ie592c03147b3cf40e9eeb631c18725d25460becf
Signed-off-by: Erickson Silva de Oliveira <Erickson.SilvadeOliveira@windriver.com>
41 lines
1.9 KiB
Markdown
41 lines
1.9 KiB
Markdown
# Sample App
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Containerized application that retrieves metrics server data
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## How does it work ?
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The sample app is a Nodejs app that requests the metrics every second and prints that in the console. The deployment creates a service account, roles and role binding to allows this application communicate with the api, this token is stored by default on `/var/run/secrets/kubernetes.io/serviceaccount/token`, the application is reading that token and doing the requests on the endpoint `/apis/metrics.k8s.io/v1beta1/pods` that returns all pod metrics and log it on console.
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## Structure
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```
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sample-app
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├── debian
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│ └── sample-app.stable_docker_image
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├── docker
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│ ├── Dockerfile.debian
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│ └── src
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│ ├── package.json
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│ └── sample-application.js
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└── readme.md
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```
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Important files
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- src - Contains Nodejs application
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- Dockerfile - Application Dockerfile
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## Run application
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> Deploy tha sample app using `system helm-override-update --reuse-values --set atribute=value <app name> <chart name> <namespace>` follow the steps below:
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- Run `system helm-override-update --reuse-values --set sampleApp.create=true metrics-server metrics-server metrics-server`
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- Run `system application-apply metrics-server` to apply the override
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- Run `kubectl get pods -n metrics-server` to get the name of the pod.
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- Run `kubectl logs -n metrics-server <pod-name> --tail 1 -f` to see the logs and check if the sample application is requesting successfully the metrics server api
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## Endpoints
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All of the following endpoints are GET endpoints and they are under the base path `/apis/metrics.k8s.io/v1beta1`:
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- `/nodes` - all node metrics
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- `/nodes/{node}` - metrics for a specified node
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- `/namespaces/{namespace}/pods` - all pod metrics within namespace with support for all-namespaces
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- `/namespaces/{namespace}/pods/{pod}` - metrics for a specified pod
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- `/pods` - all pod metrics of all namespaces
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