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Deploying a Chart to Kubernetes Cluster
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| # Confirm Helm version | |
| $ helm version | |
| # Add a helm repository to use the charts in the following demos | |
| # using this custom repository as the charts in the stable repository have been deprecated. | |
| $ helm repo add stable https://charts.helm.sh/stable | |
| # Search for a chart | |
| $ helm search repo stable/mysql | |
| # confirm current context | |
| $ kubectl config current-context | |
| # test connection to cluster | |
| $ kubectl get nodes | |
| # list helm repositories | |
| $ helm repo list | |
| # search repository for a mysql chart | |
| $ helm search repo stable/mysql | |
| # show chart definition | |
| $ helm show chart stable/mysql | |
| # show chart README | |
| $ helm show readme stable/mysql | |
| # pipe README to file | |
| $ helm show readme stable/mysql > C:\Temp\README.txt | |
| # show chart values | |
| $ helm show values stable/mysql > C:\Temp\values.txt | |
| # test deployment of chart | |
| $ helm install mysql stable/mysql --dry-run --debug | |
| # deploy chart | |
| $ helm install mysql stable/mysql | |
| # confirm deployment | |
| $ helm list |
by Retrieving information about a Release
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| # view deployments | |
| $ helm list | |
| # view status of release | |
| $ helm status mysql | |
| # get release manifests | |
| $ helm get manifest mysql > C:\Temp\manifests.txt | |
| # get release values - no user values were supplied so file will be blank | |
| $ helm get values mysql > C:\Temp\values.txt | |
| # get release notes | |
| $ helm get notes mysql > C:\Temp\notes.txt | |
| # get all from release | |
| $ helm get all mysql > C:\Temp\all.txt | |
| # view kubernetes objects | |
| $ kubectl get all | |
| # view release history | |
| $ helm history mysql | |
| # uninstall a release | |
| $ helm uninstall mysql --keep-history | |
| # confirm | |
| $ helm list | |
| # confirm with --all flag | |
| $ helm list --all | |
| # delete release | |
| $ helm delete mysql | |
| # confirm with --all flag | |
| $ helm list --all |
Upgrading a Release
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| # search the repository for a chart | |
| $ helm search repo stable/mysql | |
| # search the stable repository for a chart and retrieve the different versions (2 in the repo) | |
| $ helm search repo stable/mysql --versions | |
| # install a specific version of the chart | |
| $ helm install mysql stable/mysql --version 1.6.3 | |
| # confirm release deployed | |
| $ helm list | |
| # view kubernetes objects | |
| $ kubectl get all | |
| # upgrade the release | |
| $ helm upgrade mysql stable/mysql --version 1.6.4 | |
| # confirm release upgraded | |
| $ helm list | |
| # view history of release | |
| $ helm history mysql | |
| # view kubernetes objects | |
| $ kubectl get all |
Rolling back a Release
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| # view release | |
| helm list | |
| # view release history | |
| helm history mysql | |
| # view kubernetes objects | |
| kubectl get all | |
| # view replicasets | |
| kubectl get replicasets | |
| # rollback release | |
| helm rollback mysql 1 | |
| # view release history | |
| helm history mysql | |
| # view kubernetes objects | |
| kubectl get all | |
| # view replicasets | |
| kubectl get replicasets | |
| # view secrets | |
| kubectl get secrets | |
| ################################################################################################### | |
| # Rolling back without the old replicaset | |
| ################################################################################################### | |
| # clean up previous release | |
| helm delete mysql | |
| # deploy specific version of chart | |
| helm install mysql stable/mysql --version 1.6.3 | |
| # upgrade release | |
| helm upgrade mysql stable/mysql --version 1.6.4 | |
| # confirm history | |
| helm history mysql | |
| # view kubernetes objects | |
| kubectl get all | |
| # view replicasets | |
| kubectl get replicaset | |
| # delete old replicaset - replace NAME with the old replicaset name | |
| kubectl delete replicaset NAME | |
| # confirm deletion | |
| kubectl get replicaset | |
| # try a rollback with kubectl - will fail as we have deleted the old replicaset | |
| kubectl rollout undo deployment/mysql | |
| # but we still have the history of the release in Helm | |
| helm history mysql | |
| # rollback with helm | |
| helm rollback mysql 1 | |
| # confirm status of release | |
| helm list | |
| # confirm rollback | |
| helm history mysql | |
| # view replicaset | |
| kubectl get replicaset | |
| # the old replicaset is back! | |
| # this is due to the release history being stored as secrets in the k8s cluster | |
| kubectl get secrets | |
| # let's a look at one of those secrets | |
| kubectl get secret sh.helm.release.v1.mysql.v1 -o yaml | |
| $ kubectl get secret sh.helm.release.v1.mysql.v1 -o jsonpath="{ .data.release }" | base64 -d | base64 -d | gunzip -c | jq '.chart.templates[].data' | tr -d '"' | base64 -d | |
| # the secret is encoded. For further information on decoding these secrets, see here: - | |
| # https://dbafromthecold.com/2020/08/10/decoding-helm-secrets/ |
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