Helm’s configuration is stored in the environment variable $HELM_CONFIG_HOME , by default $HOME/.config/helm
All the environment variables are described in the documentation there.
Here are a few tools (with a wide adoption) that will add capabilities to Helm.
There are several plugins in order to extend Helm’s features.
Some of them are really useful (kubeval, diff, secrets).
Helmfile is a really useful tool that allows you to declare the state of the releases on your cluster.
It helps keeping a central view of the releases deployed on a given cluster.
It automatically configures repositories, pulls dependencies and it is very helpful to build CI/CD workflows.
Of course it uses Helm under the hood and a few modules/plugins such as secrets decryption, helm diff
These steps are very basic, you should have a look at the documentation for further details.
Install the helmdiff plugin (used by helmfile)
1helm plugin install https://github.com/databus23/helm-diff
We’ll make use of some examples provided by CloudPosse
1git clone git@github.com:cloudposse/helmfiles.git
2cd helmfiles
Let’s say we want to install the kubernetes dashboard and the reloader tool.
1cat > releases/kubernetes-dashboard/dev.yaml <<EOF
2installed: True
3banner: "Workshop cluster"
4EOF
Now we’ll create our main helmfile.yaml that describes all the releases we want to install
1cat > helmfile.yaml <<EOF
2helmfiles:
3 - path: "releases/kubernetes-dashboard/helmfile.yaml"
4 values:
5 - releases/kubernetes-dashboard/dev.yaml
6 - path: "releases/reloader/helmfile.yaml"
7 values:
8 - installed: True
9EOF
Now we can see what changes will be applied.
1helmfile diff
2Adding repo stable https://charts.helm.sh/stable
3"stable" has been added to your repositories
4
5Comparing release=kubernetes-dashboard, chart=stable/kubernetes-dashboard
6********************
7
8 Release was not present in Helm. Diff will show entire contents as new.
9
10…
The command helm sync will install the releases
1helmfile sync
2Adding repo stable https://charts.helm.sh/stable
3"stable" has been added to your repositories
4
5Affected releases are:
6 kubernetes-dashboard (stable/kubernetes-dashboard) UPDATED
7
8Upgrading release=kubernetes-dashboard, chart=stable/kubernetes-dashboard
9Release "kubernetes-dashboard" does not exist. Installing it now.
10NAME: kubernetes-dashboard
11...
You can list all the releases managed by the local helmfile.
1helmfile list
2NAME NAMESPACE ENABLED LABELS
3kubernetes-dashboard kube-system true chart:kubernetes-dashboard,component:monitoring,namespace:kube-system,repo:stable,vendor:kubernetes
4reloader reloader true chart:stakater/reloader,component:reloader,namespace:reloader,repo:stakater,vendor:stakater
Delete all the releases
1helmfile delete
2Listing releases matching ^reloader$
3reloader reloader 1 2021-02-16 10:10:35.378800455 +0100 CET deployed reloader-v0.0.68 v0.0.68
4
5Deleting reloader
6release "reloader" uninstalled
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