Helm

Helm

Helm is a tool for managing Kubernetes charts. Charts are packages of pre-configured Kubernetes resources.

What is Helm?

Helm helps your manage Kubernetes applications - Helm Charts helps you define, install, and upgrade even the most complex Kubernetes application.

Charts are easy to create, version, share, and publish - so start using Helm and stop the copy-and-paste madness.

The latest version of Helm is maintained by the CNCF - in collaboration with MS, Google... and the Helm contibutor community.

Manage Complexity

Charts describe even the most complex applications, provide repeatable application installation, and serve as a single point of authority.

Easy Updates

Take the pain out of updates with inplace upgrades and custom hooks.

Simple Sharing

Charts are easy to version, share, and host on public or private serves.

Rollbacks

Use helm rollback to roll back to an older  version of a release with ease..

Homepage

https://helm.sh/

Install

사용하는 Package manager에 따라 아래 방법으로 설치 진행한다.

$ brew install kubernetes-helm

$ choco install kubernetes-helm

$ gofish install helm

Release

https://github.com/helm/helm/releases

Github

helm

https://github.com/helm/helm

The kubernetes Package Manager

charts

https://github.com/helm/charts

Curated applications for Kubernetes

monocular

https://github.com/helm/monocular

Web UI for Helm Chart repositories

chartmuseum

https://github.com/helm/chartmuseum

Helm Chart Repoistory with support for Amazon S3, Google Cloud Storage, Microsoft Azure Blob Storage, Alibaba Cloud OSS Storage, and Openstack Object Storage

Docs

QuickStart Guide : https://docs.helm.sh/using_helm/#quickstart-guide

Helm Command

The Kubernetes package manager

To begin working with Helm, run the 'helm init' command:

$ helm init

This will install Tiller to your running Kubernetes cluster.

It will also set up any necessary local configuration.

Common actions from this point include:

- helm search:    search for charts

- helm fetch:     download a chart to your local directory to view

- helm install:   upload the chart to Kubernetes

- helm list:      list releases of charts

Environment:

  $HELM_HOME          set an alternative location for Helm files. By default, these are stored in ~/.helm

  $HELM_HOST          set an alternative Tiller host. The format is host:port

  $HELM_NO_PLUGINS    disable plugins. Set HELM_NO_PLUGINS=1 to disable plugins.

  $TILLER_NAMESPACE   set an alternative Tiller namespace (default "kube-system")

  $KUBECONFIG         set an alternative Kubernetes configuration file (default "~/.kube/config")

Usage:

  helm [command]

Available Commands:

  completion  Generate autocompletions script for the specified shell (bash or zsh)

  create      create a new chart with the given name

  delete      given a release name, delete the release from Kubernetes

  dependency  manage a chart's dependencies

  fetch       download a chart from a repository and (optionally) unpack it in local directory

  get         download a named release

  history     fetch release history

  home        displays the location of HELM_HOME

  init        initialize Helm on both client and server

  inspect     inspect a chart

  install     install a chart archive

  lint        examines a chart for possible issues

  list        list releases

  package     package a chart directory into a chart archive

  plugin      add, list, or remove Helm plugins

  repo        add, list, remove, update, and index chart repositories

  reset       uninstalls Tiller from a cluster

  rollback    roll back a release to a previous revision

  search      search for a keyword in charts

  serve       start a local http web server

  status      displays the status of the named release

  template    locally render templates

  test        test a release

  upgrade     upgrade a release

  verify      verify that a chart at the given path has been signed and is valid

  version     print the client/server version information

Flags:

      --debug                           enable verbose output

  -h, --help                            help for helm

      --home string                     location of your Helm config. Overrides $HELM_HOME (default "/Users/zzonsang2/.helm")

      --host string                     address of Tiller. Overrides $HELM_HOST

      --kube-context string             name of the kubeconfig context to use

      --kubeconfig string               absolute path to the kubeconfig file to use

      --tiller-connection-timeout int   the duration (in seconds) Helm will wait to establish a connection to tiller (default 300)

      --tiller-namespace string         namespace of Tiller (default "kube-system")

Use "helm [command] --help" for more information about a command.

Helm and Tiller 

Using SSL between helm and tiller 

$ openssl genrsa -out ./ca.key.pem 4096
$ openssl req -key ca.key.pem -new -x509 -days 7300 -sha256 -out ca.cert.pem -extensions v3_ca

MacOS 오류시에 해당 링크 참고
https://github.com/jetstack/cert-manager/issues/279#issuecomment-365827793

Enter pass phrase for ca.key.pem:
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:US
State or Province Name (full name) [Some-State]:CO
Locality Name (eg, city) []:Boulder
Organization Name (eg, company) [Internet Widgits Pty Ltd]:tiller
Organizational Unit Name (eg, section) []:
Common Name (e.g. server FQDN or YOUR name) []:tiller 

Email Address []:tiller@example.com