You need two machines with CentOS installed on them.
This is a getting started guide for CentOS. It is a manual configuration so you understand all the underlying packages / services / ports, etc…
This guide will only get ONE node working. Multiple nodes 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, centos-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, centos-minion will be the node and run kubelet, proxy, cadvisor and docker.
centos-master = 192.168.121.9 centos-minion = 192.168.121.65
Prepare the hosts:
[virt7-docker-common-release] name=virt7-docker-common-release baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/ gpgcheck=0
yum -y install --enablerepo=virt7-docker-common-release kubernetes
echo "192.168.121.9 centos-master 192.168.121.65 centos-minion" >> /etc/hosts
# Comma separated list of nodes in the etcd cluster KUBE_ETCD_SERVERS="--etcd-servers=http://centos-master:2379" # 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 privileged docker containers KUBE_ALLOW_PRIV="--allow-privileged=false"
systemctl disable iptables-services firewalld systemctl stop iptables-services firewalld
Configure the Kubernetes services on the master.
# 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://centos-master:8080" # Port kubelets listen on KUBELET_PORT="--kubelet-port=10250" # Address range to use for services KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16" # Add your own! KUBE_API_ARGS=""
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 node.
We need to configure the kubelet and start the kubelet and proxy
# 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=centos-minion" # Location of the api-server KUBELET_API_SERVER="--api-servers=http://centos-master:8080" # Add your own! KUBELET_ARGS=""
for SERVICES in kube-proxy kubelet docker; do systemctl restart $SERVICES systemctl enable $SERVICES systemctl status $SERVICES done
You should be finished!
$ kubectl get nodes NAME LABELS STATUS centos-minion <none> Ready
The cluster should be running! Launch a test pod.
You should have a functional cluster, check out 101!
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