- Install latest version >= 1.6.2 of vagrant from http://www.vagrantup.com/downloads.html
- Install latest version of Virtual Box from https://www.virtualbox.org/wiki/Downloads
- Get or build a binary release
By default, the Vagrant setup will create a single kubernetes-master and 3 kubernetes-minions. Each VM will take 512 MB, so make sure you have at least 2 GB of free memory. To start your local cluster, open a shell and run:
cd kubernetes
vagrant up
Vagrant will provision each machine in the cluster with all the necessary components to run Kubernetes. The initial setup can take a few minutes to complete on each machine.
By default, each VM in the cluster is running Fedora, and all of the Kubernetes services are installed into systemd.
To access the master or any minion:
vagrant ssh master
vagrant ssh minion-1
vagrant ssh minion-2
vagrant ssh minion-3
To view the service status and/or logs on the kubernetes-master:
vagrant ssh master
[vagrant@kubernetes-master ~] $ sudo systemctl status apiserver
[vagrant@kubernetes-master ~] $ sudo journalctl -r -u apiserver
[vagrant@kubernetes-master ~] $ sudo systemctl status controller-manager
[vagrant@kubernetes-master ~] $ sudo journalctl -r -u controller-manager
[vagrant@kubernetes-master ~] $ sudo systemctl status etcd
[vagrant@kubernetes-master ~] $ sudo systemctl status nginx
To view the services on any of the kubernetes-minion(s):
vagrant ssh minion-1
[vagrant@kubernetes-minion-1] $ sudo systemctl status docker
[vagrant@kubernetes-minion-1] $ sudo journalctl -r -u docker
[vagrant@kubernetes-minion-1] $ sudo systemctl status kubelet
[vagrant@kubernetes-minion-1] $ sudo journalctl -r -u kubelet
With your Kubernetes cluster up, you can manage the nodes in your cluster with the regular Vagrant commands.
To push updates to new Kubernetes code after making source changes:
vagrant provision
To stop and then restart the cluster:
vagrant halt
vagrant up
To destroy the cluster:
vagrant destroy
Once your Vagrant machines are up and provisioned, the first thing to do is to check that you can use the kubecfg.sh script.
Set the KUBERNETES_PROVIDER environment variable and try to list the minions:
You may need to build the binaries first, you can do this with make
$ export KUBERNETES_PROVIDER=vagrant
$ ./cluster/kubecfg.sh list /minions
Minion identifier
----------
10.245.2.4
10.245.2.3
10.245.2.2
Alternatively to using the vagrant commands, you can also use the cluster/kube-*.sh scripts to interact with the vagrant based provider just like any other hosting platform for kubernetes.
All of these commands assume you have set KUBERNETES_PROVIDER appropriately:
export KUBERNETES_PROVIDER=vagrant
Bring up a vagrant cluster
cluster/kube-up.sh
Destroy the vagrant cluster
cluster/kube-down.sh
Update the vagrant cluster after you make changes (only works when building your own releases locally):
cluster/kube-push.sh
Interact with the cluster
cluster/kubecfg.sh
When using the vagrant provider in Kubernetes, the cluster/kubecfg.sh script will cache your credentials in a ~/.kubernetes_auth_vagrant file so you will not be prompted for them in the future.
cat ~/.kubernetes_auth_vagrant
{ "User": "vagrant",
"Password": "vagrant"}
You should now be set to use the cluster/kubecfg.sh script. For example try to list the minions that you have started with:
cluster/kubecfg.sh list minions
Your cluster is running, you can list the minions in your cluster:
$ cluster/kubecfg.sh list /minions
Minion identifier
----------
10.245.2.4
10.245.2.3
10.245.2.2
Now start running some containers!
You can now use any of the cluster/kube-*.sh commands to interact with your VM machines. Before starting a container there will be no pods, services and replication controllers.
$ cluster/kubecfg.sh list /pods
ID Image(s) Host Labels Status
---------- ---------- ---------- ---------- ----------
$ cluster/kubecfg.sh list /services
ID Labels Selector Port
---------- ---------- ---------- ----------
$ cluster/kubecfg.sh list /replicationControllers
ID Image(s) Selector Replicas
---------- ---------- ---------- ----------
Start a container running nginx with a replication controller and three replicas:
$cluster/kubecfg.sh -p 8080:80 run dockerfile/nginx 3 myNginx
When listing the pods, you will see that three containers have been started and are in Waiting state:
$ cluster/kubecfg.sh list /pods
ID Image(s) Host Labels Status
---------- ---------- ---------- ---------- ----------
781191ff-3ffe-11e4-9036-0800279696e1 dockerfile/nginx 10.245.2.4/10.245.2.4 replicationController=myNginx Waiting
7813c8bd-3ffe-11e4-9036-0800279696e1 dockerfile/nginx 10.245.2.2/10.245.2.2 replicationController=myNginx Waiting
78140853-3ffe-11e4-9036-0800279696e1 dockerfile/nginx 10.245.2.3/10.245.2.3 replicationController=myNginx Waiting
You need to wait for the provisioning to complete, you can monitor the minions by doing
$ vagrant ssh minion-1
$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
<none> <none> 96864a7d2df3 26 hours ago 204.4 MB
google/cadvisor latest e0575e677c50 13 days ago 12.64 MB
kubernetes/pause latest 6c4579af347b 8 weeks ago 239.8 kB
Once the docker image for nginx has been downloaded, the container will start and you can list it:
$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dbe79bf6e25b dockerfile/nginx:latest "nginx" 21 seconds ago Up 19 seconds k8s--mynginx.8c5b8a3a--7813c8bd_-_3ffe_-_11e4_-_9036_-_0800279696e1.etcd--7813c8bd_-_3ffe_-_11e4_-_9036_-_0800279696e1--fcfa837f
fa0e29c94501 kubernetes/pause:latest "/pause" 8 minutes ago Up 8 minutes 0.0.0.0:8080->80/tcp k8s--net.a90e7ce4--7813c8bd_-_3ffe_-_11e4_-_9036_-_0800279696e1.etcd--7813c8bd_-_3ffe_-_11e4_-_9036_-_0800279696e1--baf5b21b
aa2ee3ed844a google/cadvisor:latest "/usr/bin/cadvisor - 38 minutes ago Up 38 minutes k8s--cadvisor.9e90d182--cadvisor_-_agent.file--4626b3a2
65a3a926f357 kubernetes/pause:latest "/pause" 39 minutes ago Up 39 minutes 0.0.0.0:4194->8080/tcp k8s--net.c5ba7f0e--cadvisor_-_agent.file--342fd561
Going back to listing the pods, services and replicationControllers, you now have:
$ cluster/kubecfg.sh list /pods
ID Image(s) Host Labels Status
---------- ---------- ---------- ---------- ----------
781191ff-3ffe-11e4-9036-0800279696e1 dockerfile/nginx 10.245.2.4/10.245.2.4 replicationController=myNginx Running
7813c8bd-3ffe-11e4-9036-0800279696e1 dockerfile/nginx 10.245.2.2/10.245.2.2 replicationController=myNginx Running
78140853-3ffe-11e4-9036-0800279696e1 dockerfile/nginx 10.245.2.3/10.245.2.3 replicationController=myNginx Running
$ cluster/kubecfg.sh list /services
ID Labels Selector Port
---------- ---------- ---------- ----------
$ cluster/kubecfg.sh list /replicationControllers
ID Image(s) Selector Replicas
---------- ---------- ---------- ----------
myNginx dockerfile/nginx replicationController=myNginx 3
We did not start any services, hence there is none listed. But we see three replicas displayed properly. Check the guestbook application to learn how to create a service. You can already play with resizing the replicas with:
$ cluster/kubecfg.sh resize myNginx 2
$ cluster/kubecfg.sh list /pods
ID Image(s) Host Labels Status
---------- ---------- ---------- ---------- ----------
7813c8bd-3ffe-11e4-9036-0800279696e1 dockerfile/nginx 10.245.2.2/10.245.2.2 replicationController=myNginx Running
78140853-3ffe-11e4-9036-0800279696e1 dockerfile/nginx 10.245.2.3/10.245.2.3 replicationController=myNginx Running
Congratulations!
The following will run all of the end-to-end testing scenarios assuming you set your environment in cluster/kube-env.sh
hack/e2e-test.sh
You probably have an incorrect ~/.kubernetes_auth_vagrant file for the cluster you are attempting to contact.
rm ~/.kubernetes_auth_vagrant
After using kubecfg.sh make sure that the correct credentials are set:
cat ~/.kubernetes_vagrant_auth
{
"User": "vagrant",
"Password": "vagrant"
}
If this is your first time creating the cluster, the kubelet on each minion schedules a number of docker pull requests to fetch prerequisite images. This can take some time and as a result may delay your initial pod getting provisioned.
Are you sure there was no build error? After running $ vagrant provision, scroll up and ensure that each Salt state was completed successfully on each box in the cluster.
It's very likely you see a build error due to an error in your source files!
You can control the number of minions that are instantiated via the environment variable KUBERNETES_NUM_MINIONS on your host machine. If you plan to work with replicas, we strongly encourage you to work with enough minions to satisfy your largest intended replica size. If you do not plan to work with replicas, you can save some system resources by running with a single minion. You do this, by setting KUBERNETES_NUM_MINIONS to 1 like so:
export KUBERNETES_NUM_MINIONS=1