HELM-3 commands

To install helm chart

helm install -f myvalues.yaml myredis ./redis
or helm install --set name=prod myredis ./redis
or helm install --set-string long_int=1234567890 myredis ./redis
or helm install --set-file my_script=dothings.sh myredis ./redis

To install helm charts on specific namespace

helm install -f myvalues.yaml myredis ./redis -n nemespace_name

we can pass multiple values.yaml or –set , but which is the rightmost will have the precedance
```
helm install -f myvalues.yaml -f override.yaml  myredis ./redis
```

Dry-run

helm install -f myvalues.yaml myredis ./redis --dry-run

To delete helm chart

helm uninstall release_name
helm uninstall release_name --dry-run
helm uninstall release_name -n namespace_name (To delete helm chart which was installed on specific namespace)

To list the installed charts

helm list
helm list -n namespace_name (To list installed helm charts on specific namespace)

To timeout the helm install command

helm install -f values.yaml test . -n cnf --timeout 20s  (Default is 5 minutes if we didnt pass the --timeout parameter)

To get the config file(manifest) which we used during helm install

helm get manifest release_name
helm get manifest reease_name -n namespace_name

To add a helm chart repo

helm repo add [NAME] [URL] [flags]
helm repo add bitnami https://charts.bitnami.com/bitnami
  
helm repo add - add a chart repository
helm repo index - generate an index file given a directory containing packaged charts
helm repo list - list chart repositories
helm repo remove - remove one or more chart repositories
helm repo update - update information of available charts locally from chart repositories

To search helm charts in that repo

helm search repo repo-name (eg. helm search repo bitnami/)

To search for mongodb chart
```
helm search repo bitnami/mango
```

To install helm plugin

helm plugin install https://github.com/helm/helm-2to3

To list installed plugin
```
helm plugin lsit
```

To add helm offical stable repo

helm repo add stable https://charts.helm.sh/stable

To download only the values.yaml from chart

helm inspect values repo_name/chart_name > /tmp/values.yam (eg. helm inspect values stable/jenkins > /tmp/values.yaml)

Helm 2 to 3 migration commands

Install helm version 3 and rename the binary to helm3

Installing plugin

helm3 plugin install https://github.com/helm/helm-2to3

Migrate Helm v2 configuration (Moves Chart starters, Repositories, Plugins)
```
helm3 2to3 move config --dry-run
helm3 2to3 move config
```

The plugin also supports non default Helm v2 home and Helm v3 config and data folders, an example of it’s use:

export HELM_V2_HOME=$HOME/.helm2
export HELM_V3_CONFIG=$HOME/.helm3
export HELM_V3_DATA=$PWD/.helm3
helm3 2to3 move config

Migrate Helm v2 releases

helm3 2to3 convert Release_name  (now release information is available in both version 2 and 3)
helm3 2to3 convert Release_name --delete-v2-releases (To delete information in helm 2)
If you are using Tillerless Helm v2, just add --tiller-out-cluster to migrate the release:
helm3 2to3 convert postgres --tiller-out-cluster

Clean up of Helm v2 data (Configuration (Helm home directory), v2 release data, Tiller deployment)

helm3 2to3 cleanup --dry-run
if you are using Tillerless Helm v2, just add --tiller-out-cluster to clean up Helm v2 data.
The plugin also supports non default Helm v2 home data folder and Tiller releases namespace
export HELM_V2_HOME=$PWD/.helm2
helm 2to3 cleanup --tiller-ns some_namespace

HELM-3 commands

Helm 2 to 3 migration commands

HELM-2