Helm之于Kubernetes好比yum之于Red Hat Enterprise Linux，或者apt-get之于Ubuntu。
Helm是由helm CLI和Tiller组成，是典型的Client/Server应用。helm运行于客户端，提供命令行界面；Tiller应用运行于Kubernetes内部。
在Jerry之前的文章里曾经介绍过手动下载Helm安装包，解压后把执行文件拷贝到环境变量的做法。
其实还有另外一种全自动的做法，使用安装脚本自动安装。
自动下载安装脚本
curl https://raw.githubusercontent.com/helm/helm/master/scripts/get > get_helm.sh
打开脚本，可以看到helm安装的环境变量HELM_INSTALL_DIR为/usr/local/bin:
chmod 700 get_helm.sh
./get_helm.sh:
执行helm init, 看到Happy Helming消息，说明安装成功。
Creating /root/.helm
Creating /root/.helm/repository
Creating /root/.helm/repository/cache
Creating /root/.helm/repository/local
Creating /root/.helm/plugins
Creating /root/.helm/starters
Creating /root/.helm/cache/archive
Creating /root/.helm/repository/repositories.yaml
Adding stable repo with URL: https://kubernetes-charts.storage.googleapis.com
Adding local repo with URL: http://127.0.0.1:8879/charts
$HELM_HOME has been configured at /root/.helm.
Tiller (the Helm server-side component) has been installed into your Kubernetes Cluster.
Please note: by default, Tiller is deployed with an insecure 'allow unauthenticated users' policy.
To prevent this, run helm init with the --tiller-tls-verify flag.
For more information on securing your installation see: https://docs.helm.sh/using_helm/#securing-your-helm-installation
Happy Helming!
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