kpm

by coreos

coreos / kpm

KPM is a tool to deploy and manage application stacks on Kubernetes.

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KPM

KPM is a tool to deploy and manage application stacks on kubernetes.

KPM provides the glue between kubernetes resources (ReplicaSet, DaemonSet, Secrets...). It defines a package as a composition of kubernetes resources and dependencies to other packages.

Versioning and rollbacks

KPM uses a global registry, packages are immediately accessible and visible to the community. Versioning is strong and was easy to implement: https://cnr.kubespray.com

Clustered applications and persistent-storage !
  • How to scale database slaves(postgresql/mysql/redis) ?
  • How to deploy a production-grade elasticsearch/rabbitmq/zookeep/etcd/ clusters on kubernetes? It requires stable network identity and a unique storage per pod!

---> KPM creates multiple variation of a single template with simplicity

Creating a 3 node rabbitmq cluster is easy:

  1. List the resources
  2. Add the keyword
    sharded: true
    to enable unique variation
  3. List the shards and define
resources:
  - name: rabbitmq
    file: rabbitmq-rc.yaml
    type: replicationcontroller
    sharded: yes

  • name: rabbitmq file: rabbitmq-svc.yaml type: service sharded: yes

    LB to any of the rabbitmq shard

  • name: rabbitmq file: rabbitmq-umbrella-svc.yaml type: service

shards:

  • name: hare variables: data_volume: {name: data, persistentVolumeClaim: {claimName: claim-hare}}
  • name: bunny variables: data_volume: {name: data, persistentVolumeClaim: {claimName: claim-bunny}}
    • name: rabbit-on-ram variables: data_volume: {name: data, emptyDir: ""} args: [--ram]

Demo: asciicast

Server-side

KPM is an API with an command line interface, its major difference in terms of design and possible integration.

--> We wanted a tool that could be integrated anywhere, for that KPM is building the package server side. Clients are brainless and easy to implement. As a POC we integrated KPM to a fork of https://github.com/kubernetes/dashboard in less than a day: https://youtu.be/7SJ6p38W-WM

Install kpm

From Pypi

kpm is a python2 package and available on pypi

$ sudo pip install kpm -U
`
From git
git clone https://github.com/coreos/kpm.git kpm-cli
cd kpm-cli
sudo make install

Configuration

KPM uses

kubectl
to communicate with the kubernetes cluster. Check if the cluster is accessible: ```bash $ kubectl version Client Version: version.Info{Major:"1", Minor:"1", GitVersion:"v1.1.4", GitCommit:"a5949fea3a91d6a50f40a5684e05879080a4c61d", GitTreeState:"clean"} Server Version: version.Info{Major:"1", Minor:"1", GitVersion:"v1.1.4", GitCommit:"a5949fea3a91d6a50f40a5684e05879080a4c61d", GitTreeState:"clean"}
### List packages

  • All packages: kpm list
  • Filter by user: kpm -u username

The website https://kpm.kubespray.io has more advanced search and browsing featutres than the CLI.

Deploy an application

kpm deploy package_name [-v VERSION] [--namespace namespace]

$ kpm deploy ant31/rocketchat --namespace myns create ant31/rocketchat

package version type name namespace status


ant31/mongodb 1.0.0 namespace myns myns created ant31/mongodb 1.0.0 service mongodb myns created ant31/mongodb 1.0.0 replicationcontroller mongodb myns created ant31/rocketchat 1.6.2 namespace myns myns ok ant31/rocketchat 1.6.2 service rocketchat myns created ant31/rocketchat 1.6.2 replicationcontroller rocketchat myns created ```

It deploys the package and its dependencies. The command can be executed multiple times, kpm detects changes in resource and apply only the modified ones.

Uninstall an application

The opposite action to

deploy
is the
remove
command. It performs a delete on all resources created by
deploy
. It's possible to mark some resources as
protected
.

Namespace
resources are protected by default.
kpm remove ant31/rocketchat --namespace demo
package           version    type                   name        namespace    status
----------------  ---------  ---------------------  ----------  -----------  ---------
ant31/mongodb     1.0.0      namespace              myns        myns         protected
ant31/mongodb     1.0.0      service                mongodb     myns         deleted
ant31/mongodb     1.0.0      replicationcontroller  mongodb     myns         deleted
ant31/rocketchat  1.6.2      namespace              myns        myns         protected
ant31/rocketchat  1.6.2      service                rocketchat  myns         deleted
ant31/rocketchat  1.6.2      replicationcontroller  rocketchat  myns         deleted

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