chore(k8s): start articles on costs control

.vscode/settings.json

@@ -202,6 +202,7 @@
         "knockd",
         "kubeconfig",
         "kubeconform",
+        "kubecost",
         "kubectx",
         "kubelet",
         "kubens",
@@ -244,6 +245,7 @@
         "oidc",
         "omnia",
         "ondemand",
+        "opencost",
         "openmediavault",
         "openpgp",
         "openrc",

knowledge base/kubernetes/kubecost.md

@@ -0,0 +1,80 @@
+# Kubecost
+
+Monitoring application providing real-time cost visibility and insights.
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<details>
+  <summary>Setup</summary>
+
+```sh
+helm repo add 'kubecost' 'https://kubecost.github.io/cost-analyzer/' && helm repo update 'kubecost'
+
+helm show values --repo 'https://kubecost.github.io/cost-analyzer/' 'cost-analyzer'
+
+helm --namespace 'kubecost' upgrade --install 'kubecost' 'kubecost/cost-analyzer' --create-namespace
+helm --namespace 'kubecost' upgrade --install 'kubecost' --create-namespace \
+  --repo 'https://kubecost.github.io/cost-analyzer/' 'cost-analyzer' \
+  --set 'persistentVolume.enabled=false'
+
+# EKS-specific
+VERSION='' \
+helm --namespace 'kubecost' upgrade --install 'kubecost' --create-namespace \
+  'oci://public.ecr.aws/kubecost/cost-analyzer' --version "$VERSION" \
+  --values "https://raw.githubusercontent.com/kubecost/cost-analyzer-helm-chart/$VERSION/cost-analyzer/values-eks-cost-monitoring.yaml"
+
+helm --namespace 'kubecost' uninstall 'kubecost' \
+&& kubectl delete namespace 'kubecost'
+```
+
+</details>
+
+<details>
+  <summary>Usage</summary>
+
+```sh
+kubectl --namespace 'kubecost' port-forward 'svc/kubecost-cost-analyzer' '9090' \
+&& open 'http://localhost:9090'
+```
+
+</details>
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Codebase]
+
+### Sources
+
+- [Documentation]
+- [Amazon EKS Integration]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[Amazon EKS Integration]: https://www.ibm.com/docs/en/kubecost/self-hosted/2.x?topic=installations-amazon-eks-integration
+[codebase]: https://github.com/kubecost
+[documentation]: https://github.com/kubecost/docs
+[website]: https://www.kubecost.com/
+
+<!-- Others -->

knowledge base/kubernetes/opencost.md

@@ -0,0 +1,92 @@
+# OpenCost
+
+Monitoring application providing real-time cost visibility and insights.
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<details>
+  <summary>Setup</summary>
+
+Requires:
+
+- A [Prometheus] instance to be available.
+
+  > [!caution]
+  > OpenCost's pods **will** error out and go in CrashLoopBackoff if it cannot connect to Prometheus.<br/>
+  > See the Helm chart values at `opencost.prometheus` to configure that connection.
+
+- The above Prometheus instance to have a scrape target configured for OpenCost.<br/>
+  See [OpenCost extraScrapeConfigs for Prometheus].
+
+```sh
+helm repo add 'opencost' 'https://opencost.github.io/opencost-helm-chart' && helm repo update 'opencost'
+helm search repo 'opencost/opencost' --versions
+
+helm show values --repo 'https://opencost.github.io/opencost-helm-chart' 'opencost'
+
+helm --namespace 'opencost' upgrade --install 'opencost' 'opencost/opencost' --create-namespace
+helm --namespace 'opencost' upgrade --install 'opencost' --create-namespace \
+  --repo 'https://opencost.github.io/opencost-helm-chart' 'opencost' \
+  --set 'opencost.prometheus.internal.namespaceName=prometheus'
+
+helm --namespace 'opencost' uninstall 'opencost' \
+&& kubectl delete namespace 'opencost'
+```
+
+</details>
+
+<details>
+  <summary>Usage</summary>
+
+```sh
+kubectl --namespace 'opencost' port-forward 'service/opencost' '9003' '9090'
+curl 'http://localhost:9003/allocation/compute?window=60m' \
+open 'http://localhost:9090'
+```
+
+</details>
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Codebase]
+
+### Sources
+
+- [Documentation]
+- [Amazon EKS Integration]
+- [helm chart]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+[Prometheus]: ../prometheus/README.md
+
+<!-- Files -->
+<!-- Upstream -->
+[Amazon EKS Integration]: https://www.ibm.com/docs/en/kubecost/self-hosted/2.x?topic=installations-amazon-eks-integration
+[codebase]: https://github.com/opencost/opencost
+[documentation]: https://opencost.io/docs/
+[helm chart]: https://github.com/opencost/opencost-helm-chart/
+[website]: https://opencost.io/
+[OpenCost extraScrapeConfigs for Prometheus]: https://raw.githubusercontent.com/opencost/opencost/develop/kubernetes/prometheus/extraScrapeConfigs.yaml
+
+<!-- Others -->

knowledge base/prometheus/README.md

@@ -55,10 +55,17 @@ docker run -p '9090:9090' -v "$PWD/config/dir:/etc/prometheus" -v 'prometheus-da
 helm repo add 'prometheus-community' 'https://prometheus-community.github.io/helm-charts' \
 && helm repo update 'prometheus-community'
 helm show values 'prometheus-community/prometheus'
-helm -n 'prometheus' upgrade -i --create-namespace 'prometheus' 'prometheus-community/prometheus'
+
+helm --namespace 'prometheus' upgrade --install --create-namespace 'prometheus' 'prometheus-community/prometheus'
+helm --namespace 'prometheus' upgrade --install --create-namespace 'prometheus' \
+  --repo 'https://prometheus-community.github.io/helm-charts' 'prometheus' \
+  --set 'prometheus-pushgateway.enabled=false' --set 'alertmanager.enabled=false' \
+  --set 'server.persistentVolume.enabled=false'
+
 kubectl -n 'prometheus' get pods -l 'app.kubernetes.io/name=prometheus,app.kubernetes.io/instance=prometheus' \
   -o jsonpath='{.items[0].metadata.name}' \
 | xargs -I '%%' kubectl -n 'prometheus' port-forward "%%" '9090'
+
 helm --namespace 'prometheus' uninstall 'prometheus'
 ```