Shulou(Shulou.com)06/02 Report--

I. Overview

Helm is a package management tool for kubernetes to simplify the deployment and management of Kubernetes applications. Used to manage charts-- preconfigured installation package resources.

The main roles of Helm and charts are:

Application encapsulation

Version management

Dependency check

Easy for application distribution

Helm is a Cmax S framework software, helm is equivalent to a client, and tiller is a server.

Helm CLI is a Helm client that can be executed locally

Tiller is a server-side component that runs on a Kubernetes cluster and manages the lifecycle of Kubernetes applications

Repository is the Chart repository, and the Helm client accesses the index files and packages of Chart in the warehouse through HTTP protocol.

How Helm works

Chart Install process:

Helm parses the Chart structure information from the specified directory or tgz file

Helm passes the specified Chart structure and Values information to Tiller through gRPC

Tiller generates a Release based on Chart and Values

Tiller sends Release to Kubernetes to generate Release

Chart Update process:

Helm parses the Chart structure information from the specified directory or tgz file

The name and Chart structure of the Release to be updated by Helm, and the Values information is passed to Tiller

Tiller generates Release and updates the History of the Release with the specified name

Tiller sends Release to Kubernetes to update Release

Chart Rollback process:

Helm passes the name of the Release to be rolled back to Tiller

Tiller looks up History based on the name of Release

Tiller gets the last Release from History

Tiller sends the previous Release to Kubernetes to replace the current Release

Second, install the Helm client curl-LO https://www.cnrancher.com/download/helm/helm-v2.14.3-linux-amd64.tar.gztar-xvf helm-v2.14.3-linux-amd64.tar.gzsudo cp linux-amd64/helm / usr/local/bin/

View version information

$helm versionClient: & version.Version {SemVer: "v2.14.3", GitCommit: "0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState: "clean"} Error: could not find tiller III. Install tiller Server

Create a service account

Kubectl-n kube-system create serviceaccount tillerkubectl create clusterrolebinding tiller-- clusterrole cluster-admin-- serviceaccount=kube-system:tiller

Initialize tiller

Note: tiller-image needs to be explicitly specified in offline environment, and it needs to be consistent with the version of helm client, such as v2.14.3 above. The appropriate version is automatically selected by environment variables below.

Docker pull zhaojiajie/kubernetes-helm/tiller:v2.14.3 helm init-- service-account tiller--tiller-image rancher/tiller:v2.14.3-- skip-refresh $kubectl get pods-- namespace kube-system | grep tillertiller-deploy-65cff4d7bc-g9gzm 1 Running 0 11d $helm versionClient: & version.Version {SemVer: "v2.14.3", GitCommit: "0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState: "clean"} Server: & version.Version {SemVer: "v2.14.3" GitCommit: "0e7f3b6637f7af8fcfddb3d2941fcc7cbebb0085", GitTreeState: "clean"}

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