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##Getting started on Fedora

This is a getting started guide for Fedora. It is a manual configuration so you understand all the underlying packages / services / ports, etc...

This guide will only get ONE minion working. Multiple minions requires a functional networking configuration done outside of kubernetes. Although the additional kubernetes configuration requirements should be obvious.

The kubernetes package provides a few services: kube-apiserver, kube-scheduler, kube-controller-manager, kubelet, kube-proxy. These services are managed by systemd and the configuration resides in a central location: /etc/kubernetes. We will break the services up between the hosts. The first host, fed-master, will be the kubernetes master. This host will run the kube-apiserver, kube-controller-manager, and kube-scheduler. In addition, the master will also run etcd. The remaining host, fed-minion will be the minion and run kubelet, proxy, cadvisor and docker.

System Information:

Hosts:

fed-master = 192.168.121.9
fed-minion = 192.168.121.65

Prepare the hosts:

  • Install kubernetes on all hosts - fed-{master,minion}. This will also pull in etcd, docker, and cadvisor.
yum -y install --enablerepo=updates-testing kubernetes
  • Add master and minion to /etc/hosts on all machines (not needed if hostnames already in DNS)
echo "192.168.121.9	fed-master
192.168.121.65	fed-minion" >> /etc/hosts
  • Edit /etc/kubernetes/config which will be the same on all hosts to contain:
# Comma seperated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd_servers=http://fed-master:4001"

# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"

# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"

# Should this cluster be allowed to run privleged docker containers
KUBE_ALLOW_PRIV="--allow_privileged=false"
  • Disable the firewall on both the master and minon, as docker does not play well with other firewall rule managers
systemctl disable iptables-services firewalld
systemctl stop iptables-services firewalld

Configure the kubernetes services on the master.

  • Edit /etc/kubernetes/apiserver to appear as such:
# The address on the local server to listen to.
KUBE_API_ADDRESS="--address=0.0.0.0"

# The port on the local server to listen on.
KUBE_API_PORT="--port=8080"

# How the replication controller and scheduler find the kube-apiserver
KUBE_MASTER="--master=http://fed-master:8080"

# Port minions listen on
KUBELET_PORT="--kubelet_port=10250"

# Address range to use for services
KUBE_SERVICE_ADDRESSES="--portal_net=10.254.0.0/16"

# Add you own!
KUBE_API_ARGS=""
  • Edit /etc/kubernetes/controller-manager to appear as such:
# Comma seperated list of minions
KUBELET_ADDRESSES="--machines=fed-minion"
  • Start the appropriate services on master:
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do 
	systemctl restart $SERVICES
	systemctl enable $SERVICES
	systemctl status $SERVICES 
done

Configure the kubernetes services on the minion.

We need to configure the kubelet and start the kubelet and proxy

  • Edit /etc/kubernetes/kubelet to appear as such:
# The address for the info server to serve on
KUBELET_ADDRESS="--address=0.0.0.0"

# The port for the info server to serve on
KUBELET_PORT="--port=10250"

# You may leave this blank to use the actual hostname
KUBELET_HOSTNAME="--hostname_override=fed-minion"

# Add your own!
KUBELET_ARGS=""
  • Start the appropriate services on minion (fed-minion).
for SERVICES in kube-proxy kubelet docker; do 
    systemctl restart $SERVICES
    systemctl enable $SERVICES
    systemctl status $SERVICES 
done

You should be finished!

  • Check to make sure the cluster can see the minion (on fed-master)
kubectl get minions
NAME                LABELS
fed-minion          <none>

The cluster should be running! Launch a test pod.

You should have a functional cluster, check out 101!