Guides

How to get started, and accomplish tasks, using Kubernetes.

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Prerequisites

Prerequisites

  1. You need 2 or more machines with Fedora installed.

Instructions

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 node (previously minion) working. Multiple nodes require 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 (not needed if etcd runs on a different host but this guide assumes that etcd and Kubernetes master run on the same host). The remaining host, fed-node will be the node and run kubelet, proxy and docker.

System Information:

Hosts:

fed-master = 192.168.121.9
fed-node = 192.168.121.65

Prepare the hosts:

yum -y install --enablerepo=updates-testing kubernetes
yum -y install etcd iptables
echo "192.168.121.9	fed-master
192.168.121.65	fed-node" >> /etc/hosts
# Comma separated list of nodes in the etcd cluster
KUBE_MASTER="--master=http://fed-master:8080"

# 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"

# Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:4001"

# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"

# Add your own!
KUBE_API_ARGS=""
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:4001"
mkdir /var/run/kubernetes
chown kube:kube /var/run/kubernetes
chmod 750 /var/run/kubernetes
for SERVICES in etcd kube-apiserver kube-controller-manager kube-scheduler; do
	systemctl restart $SERVICES
	systemctl enable $SERVICES
	systemctl status $SERVICES
done
{
    "apiVersion": "v1",
    "kind": "Node",
    "metadata": {
        "name": "fed-node",
        "labels":{ "name": "fed-node-label"}
    },
    "spec": {
        "externalID": "fed-node"
    }
}

Now create a node object internally in your Kubernetes cluster by running:

$ kubectl create -f ./node.json

$ kubectl get nodes
NAME                LABELS              STATUS
fed-node           name=fed-node-label     Unknown

Please note that in the above, it only creates a representation for the node fed-node internally. It does not provision the actual fed-node. Also, it is assumed that fed-node (as specified in name) can be resolved and is reachable from Kubernetes master node. This guide will discuss how to provision a Kubernetes node (fed-node) below.

Configure the Kubernetes services on the node.

We need to configure the kubelet on the node.

###
# Kubernetes kubelet (node) config

# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)
KUBELET_ADDRESS="--address=0.0.0.0"

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

# location of the api-server
KUBELET_API_SERVER="--api-servers=http://fed-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
kubectl get nodes
NAME                LABELS              STATUS
fed-node          name=fed-node-label     Ready

To delete fed-node from your Kubernetes cluster, one should run the following on fed-master (Please do not do it, it is just for information):

kubectl delete -f ./node.json

You should be finished!

The cluster should be running! Launch a test pod.

You should have a functional cluster, check out 101!

Support Level

IaaS Provider Config. Mgmt OS Networking Docs Conforms Support Level
Bare-metal custom Fedora none docs   Project

For support level information on all solutions, see the Table of solutions chart.

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