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feat(k8s): check usage of ephemeral storage

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This commit is contained in:
Michele Cereda
2024-10-09 00:01:13 +02:00
parent 2c233c47de
commit 6760b9ca8b
2 changed files with 21 additions and 15 deletions
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32
knowledge base/kubernetes/kubectl.md
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@@ -32,7 +32,7 @@ One possible output format is [JSONpath].
1. [Verbosity and debugging](#verbosity-and-debugging)
1. [Plugins](#plugins)
1. [Further readings](#further-readings)
1. [Sources](#sources)
1. [Sources](#sources)
## TL;DR
@@ -463,9 +463,13 @@ volumeBindingMode: WaitForFirstConsumer
allowVolumeExpansion: true
EOF
# Check persistent volumes' usage
# Need to connect to the pod mounting it
# Check persistent volumes' usage.
# Need to connect to the pod mounting it.
kubectl -n 'gitea' exec 'gitea-766fd5fb64-2qlqb' -c 'gitea' -- df -h '/data'
# Get ephemeral storage usage for pods.
kubectl get --raw "/api/v1/nodes/ip-172-31-69-42.eu-west-1.compute.internal/proxy/stats/summary" \
| jq '.pods[] | select(.podRef.name == "gitlab-runner-59dd68c5cb-9vcp4")."ephemeral-storage"'
```
</details>
@@ -676,20 +680,25 @@ TODO
- [Enforce Pod Security Standards with Namespace Labels]
- [Krew]
## Sources
All the references in the [further readings] section, plus the following:
### Sources
- [Cheatsheet]
- [Run a single-instance stateful application]
- [Run a replicated stateful application]
- [Accessing an application on Kubernetes in Docker]
- [Plugins]
- [How can I determine the current ephemeral-storage usage of a running Kubernetes pod?]
<!--
References
Reference
═╬═Time══
-->
<!-- Knowledge base -->
[jsonpath]: ../jsonpath.md
[krew]: krew.placeholder
[kubernetes]: README.md
<!-- Upstream -->
[assigning pods to nodes]: https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/
[cheatsheet]: https://kubernetes.io/docs/reference/kubectl/cheatsheet
@@ -700,15 +709,8 @@ All the references in the [further readings] section, plus the following:
[plugins]: https://kubernetes.io/docs/tasks/extend-kubectl/kubectl-plugins/
[taints and tolerations]: https://kubernetes.io/docs/concepts/scheduling-eviction/taint-and-toleration/
<!-- In-article sections -->
[further readings]: #further-readings
<!-- Knowledge base -->
[jsonpath]: ../jsonpath.md
[krew]: krew.placeholder
[kubernetes]: README.md
<!-- Others -->
[accessing an application on kubernetes in docker]: https://medium.com/@lizrice/accessing-an-application-on-kubernetes-in-docker-1054d46b64b1
[how can i determine the current ephemeral-storage usage of a running kubernetes pod?]: https://stackoverflow.com/questions/53217227/how-can-i-determine-the-current-ephemeral-storage-usage-of-a-running-kubernetes#72891131
[run a replicated stateful application]: https://kubernetes.io/docs/tasks/run-application/run-replicated-stateful-application/
[run a single-instance stateful application]: https://kubernetes.io/docs/tasks/run-application/run-single-instance-stateful-application/

4
snippets/kubectl.sh
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@@ -70,3 +70,7 @@ kubectl cordon 'kworker-rj2' \
kubectl get --raw "/api/v1/nodes/ip-172-31-69-42.eu-west-1.compute.internal/proxy/stats/summary"
# Get raw information as Prometheus metrics
kubectl get --raw "/api/v1/nodes/ip-172-31-69-42.eu-west-1.compute.internal/proxy/metrics/cadvisor"
# Get ephemeral storage usage for pods
kubectl get --raw "/api/v1/nodes/ip-172-31-69-42.eu-west-1.compute.internal/proxy/stats/summary" \
| jq '.pods[] | select(.podRef.name == "gitlab-runner-59dd68c5cb-9vcp4")."ephemeral-storage"'