kubernetes master #4

  • By mbruzek
  • Latest version (#4)
  • trusty
  • Stable
  • Edge

Description

Provides a kubernetes api endpoint, scheduler for managing containers.

Kubernetes Master Charm

Kubernetes is an open
source system for managing containerized applications across multiple hosts.
Kubernetes uses Docker to package, instantiate and run
containerized applications.

The Kubernetes Juju charms enable you to run Kubernetes on all the cloud
platforms that Juju supports.

A Kubernetes deployment consists of several independent charms that can be
scaled to meet your needs

Etcd

Etcd is a key value store for Kubernetes. All persistent master state
is stored in etcd.

Flannel-docker

Flannel is a
software defined networking
component that provides individual subnets for each machine in the cluster.

Docker

Docker is an open platform for distributing applications for system administrators.

Kubernetes master

The controlling unit in a Kubernetes cluster is called the master. It is the
main management contact point providing many management services for the worker
nodes.

Kubernetes minion

The servers that perform the work are known as minions. Minions must be able to
communicate with the master and run the workloads that are assigned to them.

Usage

Deploying the Development Focus

To deploy a Kubernetes environment in Juju :

juju deploy cs:~kubernetes/trusty/etcd
juju deploy cs:trusty/flannel-docker
juju deploy cs:trusty/docker
juju deploy local:trusty/kubernetes-master
juju deploy local:trusty/kubernetes

juju add-relation etcd flannel-docker
juju add-relation flannel-docker:network docker:network
juju add-relation flannel-docker:docker-host docker
juju add-relation etcd kubernetes
juju add-relation etcd kubernetes-master
juju add-relation kubernetes kubernetes-master

Deploying the recommended configuration

Use the 'juju quickstart' command to deploy a Kubernetes cluster to any cloud
supported by Juju.

The charm store version of the Kubernetes bundle can be deployed as follows:

juju quickstart u/kubernetes/kubernetes-cluster

Note: The charm store bundle may be locked to a specific Kubernetes release.

Alternately you could deploy a Kubernetes bundle straight from github or a file:

juju quickstart https://raw.githubusercontent.com/kubernetes/kubernetes/master/cluster/juju/bundles/local.yaml

The command above does few things for you:

  • Starts a curses based gui for managing your cloud or MAAS credentials
  • Looks for a bootstrapped deployment environment, and bootstraps if
    required. This will launch a bootstrap node in your chosen
    deployment environment (machine 0).
  • Deploys the Juju GUI to your environment onto the bootstrap node.
  • Provisions 4 machines, and deploys the Kubernetes services on top of
    them (Kubernetes-master, two Kubernetes minions using flannel, and etcd).
  • Orchestrates the relations among the services, and exits.

Now you should have a running Kubernetes. Run juju status --format=oneline to see the address of your kubernetes-master unit.

For further reading on Juju Quickstart

Go to the Getting started with Juju guide
for more information about deploying a development Kubernetes cluster.

Post Deployment

To interact with the kubernetes environment, either build or
download the
kubectl
binary (available in the releases binary tarball) and point it to the master with :

$ juju status kubernetes-master | grep public
public-address: 104.131.108.99
$ export KUBERNETES_MASTER="104.131.108.99"

Configuration

For you convenience this charm supports changing the version of kubernetes binaries.
This can be done through the Juju GUI or on the command line:

juju set kubernetes version=”v0.10.0”

If the charm does not already contain the tar file with the desired architecture
and version it will attempt to download the kubernetes binaries using the gsutil
command.

Congratulations you know have deployed a Kubernetes environment! Use the
kubectl
to interact with the environment.

Kubernetes information

Analytics

Configuration

username
(string) The initial user for the kubernetes basic authentication file.
admin
apiserver-cert
(string) The ssl certificate to use for tls communication to the Kubernetes api server. If this value is empty a self signed certificate and key will be generated.
password
(string) The password for the kubernetes basic authentication. If this value is empty, a password will be generated at random for the username.
version
(string) The kubernetes release to use in this charm. The binary files are compiled from the source identified by this tag in github. Using the value of "source" will use the master kubernetes branch when compiling the binaries.
v1.0.0
apiserver-key
(string) The private key to use for tls communication to the Kubernetes api server. If this value is empty a key and certificate will be generated.