Fixes after 20231018

Author: nicholasdille

120_kubernetes/ci_cd/slides.md

@@ -166,14 +166,30 @@ Force pods onto specific nodes
 
 Force pods on the same node or on different nodes
 
-### Tains / tolerations
+### Taints / tolerations
 
 Reserve nodes for specific pods (taints)
 
 Pods must accept taints (tolerations)
 
 ---
 
+## Custom scheduling and autoscaling
+
+### Autoscaling
+
+Using custom metrics for HPA [](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/#autoscaling-on-multiple-metrics-and-custom-metrics)
+
+NodeAffinity can use labels provided by cloud / hosting provider
+
+Kubernetes-based Event Driven Autoscaling (KEDA) [](https://github.com/kedacore/keda)
+
+### Scheduling
+
+Power Efficiency Aware Kubernetes Scheduler (PEAKS) [](https://github.com/sustainable-computing-io/peaks)
+
+---
+
 ## Lessons Learnt 1/
 
 ### Avoid `kubectl create <resource>`
@@ -283,6 +299,8 @@ kubectl delete pod \
 
 ### Use plaintext in `Secret`
 
+Secret expect base64-encoded fields under `data`
+
 Templating becomes easier when inserting plaintext
 
 ```yaml
@@ -317,6 +335,29 @@ Let bots do the work for you
 
 Doing updates regularly is easier
 
+Pull/merge requests for every updates
+
 Automerge for patches can help stay on top of things
 
 Automated tests help decide whether an update is safe
+
+---
+
+## Lessons Learnt 7/7
+
+### Deployment history
+
+Deployments keep history of changes
+
+```bash
+kubectl rollout history deployment/my-nginx
+```
+
+### Populating `CHANGE-CAUSE`
+
+Add annotation `kubernetes.io/change-cause` before the change [](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#checking-rollout-history-of-a-deployment)
+
+```bash
+kubectl annotate deployment/my-nginx \
+    kubernetes.io/change-cause="image updated to 1.24.0"
+```

120_kubernetes/helm/helm.demo

@@ -34,4 +34,7 @@ kubectl get deployments.apps my-nginx -o yaml | grep image:
 helm get values my-nginx
 
 # Display release history
-helm history my-nginx
+helm history my-nginx
+
+# Check templated resources
+helm template my-nginx bitnami/nginx

120_kubernetes/helm/slides.md

@@ -6,7 +6,7 @@ Package manager for Kubernetes [](https://helm.sh/)
 
 Separation of templates (called chart) and values
 
-Supports install/upgrade/uninstall and upgrade/rollback
+Supports install/uninstall and upgrade/rollback
 
 Based on go templates [](https://godoc.org/text/template) and sprig library [](https://masterminds.github.io/sprig/)
 
@@ -54,14 +54,14 @@ Many charts from the community on ArtifactHub [](https://artifacthub.io/)
     ```bash
     helm upgrade my-nginx bitnami/nginx --set service.type=ClusterIP
     ```
-    <!-- .element: style="width: 35em;" -->
+    <!-- .element: style="width: 43em;" -->
 
 1. Use nginx stable release [](https://hub.docker.com/r/bitnami/nginx/tags)
 
     ```bash
     helm upgrade my-nginx bitnami/nginx --reuse-values --set image.tag=1.24.0
     ```
-    <!-- .element: style="width: 35em;" -->
+    <!-- .element: style="width: 43em;" -->
 
 When setting very few fields, use `--set`
 
@@ -81,10 +81,33 @@ Time drift can cause authentication issues
 
 ### Helm chart for ntp
 
-| File                       | Description    |
-| -------------------------- | -------------- |
-| `Chart.yaml`               | Metadata       |
-| `values.yaml`              | Default values |
-| `templates/`               | Templates      |
-| `templates/daemonset.yaml` | Daemonset      |
-| `templates/_helpers.tpl`   | Variables      |
+| File                       | Description            |
+| -------------------------- | ---------------------- |
+| `Chart.yaml`               | Metadata               |
+| `values.yaml`              | Default values         |
+| `templates/daemonset.yaml` | Template for Daemonset |
+| `templates/_helpers.tpl`   | Template variables     |
+
+Test chart using `helm test` [](https://helm.sh/docs/topics/chart_tests/)...
+
+...or `chart-testing` [](https://github.com/helm/chart-testing)
+
+---
+
+## Where Helm stores its data
+
+Release and revision information is stored per namespace
+
+Helm creates a secret for each release and revision
+
+### Decoding the contents
+
+```bash
+helm upgrade --install my-nginx bitnami/nginx \
+    --set service.type=ClusterIP
+kubectl get secrets sh.helm.release.v1.my-nginx.v1 --output json \
+| jq --raw-output .data.release \
+| base64 -d \
+| base64 -d \
+| gzip -d
+```

120_kubernetes/kustomize/service.yaml

@@ -5,7 +5,6 @@ metadata:
   name: my-service
 spec:
   selector:
-    matchLabels:
   type: LoadBalancer
   ports:
   - protocol: TCP

120_kubernetes/kustomize/slides.md

@@ -6,6 +6,8 @@ Official project [](https://github.com/kubernetes-sigs/kustomize) by Kubernetes
 
 Official documentation [](https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/)
 
+Run `kustomize` as part of `kubectl`: `kubectl apply -k .`
+
 ### Demo
 
 Create final resource descriptions from YAML [](https://github.com/nicholasdille/container-slides/blob/master/120_kubernetes/kustomize/kustomize.demo)

140_gitops/projects.md

@@ -4,7 +4,7 @@
 
 The GitOps reference project
 
-Created by [WeaveWorks](https://www.weave.works/), CNCF [sandbox project](https://www.cncf.io/sandbox-projects/)
+Created by WeaveWorks []](https://www.weave.works/), CNCF graduated project [](https://www.cncf.io/sandbox-projects/)
 
 ### [ArgoCD](https://argoproj.github.io/argo-cd/)
 
@@ -18,4 +18,4 @@ Kubernetes native CI/CD (Jenkins X builds on top)
 
 Part of the [cd.foundation](https://cd.foundation/)
 
-CNCF graduated project [](https://www.cncf.io/projects/flux/)
+cd.foundation graduated project [](https://www.cncf.io/projects/flux/)