Helm kubernetes package management tool

helm Can help us manage kubernetes Applications ,helm Charts Can define , Install and upgrade complex kubernetes Applications ,charts Packages are easy to create , version management , Sharing and distribution .helm about kubernetes It's equivalent to yum about centos Come on , without yum Words , We are centos It is extremely troublesome to install some applications below .

Of course, the first one available kubernetes colony , Then we use helm The node has been configured and can be accessed through kubectl Access cluster , because helm It's actually read kebeconfig File to access the of the cluster .

because helm V2 Version must be in kubernetes Install one in the cluster tiller Services to communicate , This greatly reduces its security and availability , So in v3 The server is removed from the version , Using a universal kubernetes CRD Resources to manage , So you just need to connect kubernets that will do .

once helm After the client is successfully prepared , We can add one charts Warehouse , Of course, the most commonly used is the official helm stable charts Warehouse ,

helm  repo  add  stable  

helm  repo  list  

helm  search  repo  stable  After installation, you can use search Command to search for installed chart package

To install a chart package , We can use helm install command ,helm There are many ways to find and install chart package , But the simplest solution, of course, is to use official stable This warehouse

Will be available from the warehouse first charts Synchronization of information to local , Can ensure that we get the latest charts list

helm  repo  update

helm  install  stabel/mysql  --generate-name 

helm show  chart  stable/mysql Command to understand mysql This chart Some of the features of the package .

It should be noted that whenever you install chart Will create a new one release, So a chart Packages can be installed in the same cluster multiple times , Each package can be managed and upgraded independently

helm  ls  Check that it has been installed to release

uninstall Command from the kubernetes Delete in release, Will also delete and release All that is relevant kubernetes Resources and release Historical record . You can also use when deleting --keep-history Parameters , Will keep release Historical record , You can get the change release The state of is uninstalled, Instead of not finding it release

because helm Back to delete release Follow your release, So you can review the history and even cancel the deletion release  

helm  rollback

customized