helm
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README.md
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README.md
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* [Stick the nginx-ingress controler and my-nginx app together](#stick-nginx-ingress-and-tcp-service)
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* [Test exposed app on TCP-port 9000](#test-nginx-ingress-and-tcp-service)
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* [Running DaemonSets on `hostPort`](#running-daemonsets)
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* [HELM charts](#helm)
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* [Create a chart](#helm-create)
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* [Install local chart without](#packaging helm-install-without-packaging)
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* [List deployed helm charts](#helm-list)
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* [Upgrade local chart without packaging](#helm-upgrade)
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* [Get status of deployed chart](#helm-status)
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* [Get deployment history](#helm-history)
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* [Rollback](#helm-rollback)
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## Install k3s <a name="install-k3s"></a>
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https://k3s.io/:
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rollingUpdate:
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maxUnavailable: 1
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type: RollingUpdate
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```
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# HELM charts <a name="helm"></a>
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Docs:
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* https://helm.sh/docs/intro/using_helm/
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Prerequisites:
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* running kubernetes installation
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* kubectl with ENV[KUBECONFIG] pointing to appropriate config file
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* helm
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## Create a chart <a name="helm-create"></a>
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`helm create helm-test`
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```
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~/kubernetes/helm$ tree helm-test/
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helm-test/
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├── charts
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├── Chart.yaml
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├── templates
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│ ├── deployment.yaml
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│ ├── _helpers.tpl
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│ ├── hpa.yaml
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│ ├── ingress.yaml
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│ ├── NOTES.txt
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│ ├── serviceaccount.yaml
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│ ├── service.yaml
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│ └── tests
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│ └── test-connection.yaml
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└── values.yaml
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```
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## Install local chart without packaging <a name="helm-install-without-packaging"></a>
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`helm install helm-test-dev helm-test/ --set image.tag=latest --debug --wait`
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or just a *dry-run*:
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`helm install helm-test-dev helm-test/ --set image.tag=latest --debug --dry-run`
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```
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--wait: Waits until all Pods are in a ready state, PVCs are bound, Deployments have minimum (Desired minus maxUnavailable)
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Pods in ready state and Services have an IP address (and Ingress if a LoadBalancer) before marking the release as successful.
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It will wait for as long as the --timeout value. If timeout is reached, the release will be marked as FAILED. Note: In
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scenarios where Deployment has replicas set to 1 and maxUnavailable is not set to 0 as part of rolling update strategy,
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--wait will return as ready as it has satisfied the minimum Pod in ready condition.
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```
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## List deployed helm charts <a name="helm-list"></a>
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```
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~/kubernetes/helm$ helm list
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NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION
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helm-test-dev default 4 2020-08-27 12:30:38.98457042 +0200 CEST deployed helm-test-0.1.0 1.16.0
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```
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## Upgrade local chart without packaging <a name="helm-upgrade"></a>
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```
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~/kubernetes/helm$ helm upgrade helm-test-dev helm-test/ --set image.tag=latest --wait --timeout 60s
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Release "helm-test-dev" has been upgraded. Happy Helming!
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NAME: helm-test-dev
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LAST DEPLOYED: Thu Aug 27 12:47:09 2020
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NAMESPACE: default
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STATUS: deployed
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REVISION: 7
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NOTES:
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1. Get the application URL by running these commands:
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export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=helm-test,app.kubernetes.io/instance=helm-test-dev" -o jsonpath="{.items[0].metadata.name}")
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echo "Visit http://127.0.0.1:8080 to use your application"
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kubectl --namespace default port-forward $POD_NAME 8080:80
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```
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`helm upgrade [...] --wait` is synchronous and exit with 0 on success, otherwise with >0 on failure. `helm upgrade` will wait for 5 minutes Setting the `--timeout` (Default 5 minutes) flag makes This can be used in term of CI/CD deployments with Jenkins.
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## Get status of deployed chart <a name="helm-status"></a>
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```
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~/kubernetes/helm$ helm status helm-test-dev
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NAME: helm-test-dev
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LAST DEPLOYED: Thu Aug 27 12:47:09 2020
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NAMESPACE: default
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STATUS: deployed
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REVISION: 7
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NOTES:
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1. Get the application URL by running these commands:
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export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=helm-test,app.kubernetes.io/instance=helm-test-dev" -o jsonpath="{.items[0].metadata.name}")
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echo "Visit http://127.0.0.1:8080 to use your application"
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kubectl --namespace default port-forward $POD_NAME 8080:80
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```
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## Get deployment history <a name="helm-history"></a>
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```
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~/kubernetes/helm$ helm history helm-test-dev
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REVISION UPDATED STATUS CHART APP VERSION DESCRIPTION
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10 Thu Aug 27 12:56:33 2020 failed helm-test-0.1.0 1.16.0 Upgrade "helm-test-dev" failed: timed out waiting for the condition
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11 Thu Aug 27 13:08:34 2020 superseded helm-test-0.1.0 1.16.0 Upgrade complete
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12 Thu Aug 27 13:09:59 2020 superseded helm-test-0.1.0 1.16.0 Upgrade complete
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13 Thu Aug 27 13:10:24 2020 superseded helm-test-0.1.0 1.16.0 Rollback to 11
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14 Thu Aug 27 13:23:22 2020 failed helm-test-0.1.1 blubb Upgrade "helm-test-dev" failed: timed out waiting for the condition
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15 Thu Aug 27 13:26:43 2020 pending-upgrade helm-test-0.1.1 blubb Preparing upgrade
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16 Thu Aug 27 13:27:12 2020 superseded helm-test-0.1.1 blubb Upgrade complete
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17 Thu Aug 27 14:32:32 2020 superseded helm-test-0.1.1 Upgrade complete
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18 Thu Aug 27 14:33:58 2020 superseded helm-test-0.1.1 Upgrade complete
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19 Thu Aug 27 14:36:49 2020 failed helm-test-0.1.1 cosmetics Upgrade "helm-test-dev" failed: timed out waiting for the condition
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```
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## Rollback <a name="helm-rollback"></a>
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`helm rollback helm-test-dev 18 --wait`
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```
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~/kubernetes/helm$ helm history helm-test-dev
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REVISION UPDATED STATUS CHART APP VERSION DESCRIPTION
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10 Thu Aug 27 12:56:33 2020 failed helm-test-0.1.0 1.16.0 Upgrade "helm-test-dev" failed: timed out waiting for the condition
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11 Thu Aug 27 13:08:34 2020 superseded helm-test-0.1.0 1.16.0 Upgrade complete
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12 Thu Aug 27 13:09:59 2020 superseded helm-test-0.1.0 1.16.0 Upgrade complete
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13 Thu Aug 27 13:10:24 2020 superseded helm-test-0.1.0 1.16.0 Rollback to 11
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14 Thu Aug 27 13:23:22 2020 failed helm-test-0.1.1 blubb Upgrade "helm-test-dev" failed: timed out waiting for the condition
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15 Thu Aug 27 13:26:43 2020 pending-upgrade helm-test-0.1.1 blubb Preparing upgrade
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16 Thu Aug 27 13:27:12 2020 superseded helm-test-0.1.1 blubb Upgrade complete
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17 Thu Aug 27 14:32:32 2020 superseded helm-test-0.1.1 Upgrade complete
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18 Thu Aug 27 14:33:58 2020 superseded helm-test-0.1.1 Upgrade complete
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19 Thu Aug 27 14:36:49 2020 failed helm-test-0.1.1 cosmetics Upgrade "helm-test-dev" failed: timed out waiting for the condition
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20 Thu Aug 27 14:37:36 2020 deployed helm-test-0.1.1 Rollback to 18
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```
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```
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~/kubernetes/helm$ helm status helm-test-dev
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NAME: helm-test-dev
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LAST DEPLOYED: Thu Aug 27 14:37:36 2020
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NAMESPACE: default
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STATUS: deployed
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REVISION: 20
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NOTES:
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1. Get the application URL by running these commands:
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export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=helm-test,app.kubernetes.io/instance=helm-test-dev" -o jsonpath="{.items[0].metadata.name}")
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echo "Visit http://127.0.0.1:8080 to use your application"
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kubectl --namespace default port-forward $POD_NAME 8080:80
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```
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