Helm is a package manager, which provides an easy way to manage and publish applications on the Kubernetes. It was first built by the collaboration between Dies and Google in the year 2018. While working with Kubernetes, Helm is useful in the following ways:
All the above benefits effectively make Helm as the de-facto standard for Kubernetes package management.
For more details about Helm and how it is used in a Kubernetes network, we recommend reading our blog What is Helm in Kubernetes? before you proceed with the installation of Helm.
curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
chmod 700 get_helm.sh
helm repo add stable https://kubernetes-charts.storage.googleapis.com/
helm search repo stable
helm search repo mysql
helm repo update
helm install stable/mysql --generate-name
If you want to see what just happened, find the .cache directory in the
$HOME path, and unzip the tarred file. You will find Chart.yaml file with some information about the chart, Values.yaml file with the default values, and multiple manifests for various Kubernetes objects, such as deployment, services and service accounts, etc. It also creates a _helpers.tpl file, to put the template helpers that you can re-use throughout the chart.
Another useful file is the NOTES.txt file. This gets printed out on the terminal after the chart is successfully deployed. This would be a very useful file while making the Helm chart as it is a useful place to briefly describe the steps for using a chart. The NOTES.txt file can be used to print out working commands for obtaining an IP address or getting a password from a Secret object.
tar -zxvf mysql-1.6.2.tgz
To dig deeper in Helm syntax please refer to the Guide in Helm.
It's really easy to create a chart in Helm
The first thing to create a Helm chart is to use the Helm create command, which will give you a platform for building your own chart.
Run the following commands on the Terminal -
$ helm create mychart
When you go into the directory
mychart/templates/ , there are a few files that are already present there. They are:
helm install --debug --dry-run <name-of-release>
As you develop your chart, you could use a command
Helm lint which will help you understand whether your templates are well-formed. If the lint does not find any issue with the document then you are good to go, but if it spots any error it will alert you with it.
And while you are here, you can check out our training in Helm to know more about this technology.
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