Fedora (Single Node)
Prerequisites
- You need 2 or more machines with Fedora installed. These can be either bare metal machines or virtual machines.
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 = 192.168.121.65Prepare the hosts:
- Install Kubernetes on all hosts - fed-{master,node}. This will also pull in docker. Also install etcd on fed-master. This guide has been tested with Kubernetes-0.18 and beyond.
- Running on AWS EC2 with RHEL 7.2, you need to enable “extras” repository for yum by editing
/etc/yum.repos.d/redhat-rhui.repoand changing theenable=0toenable=1for extras.
dnf -y install kubernetes- Install etcd
dnf -y install etcd- Add master and node to
/etc/hostson all machines (not needed if hostnames already in DNS). Make sure that communication works between fed-master and fed-node by using a utility such as ping.
echo "192.168.121.9 fed-master
192.168.121.65 fed-node" >> /etc/hosts- Edit
/etc/kubernetes/config(which should be the same on all hosts) to set the name of the master server:
# Comma separated list of nodes in the etcd cluster
KUBE_MASTER="--master=http://fed-master:8080"- Disable the firewall on both the master and node, as Docker does not play well with other firewall rule managers. Please note that iptables.service does not exist on the default Fedora Server install.
systemctl mask firewalld.service
systemctl stop firewalld.service
systemctl disable iptables.service
systemctl stop iptables.serviceConfigure the Kubernetes services on the master.
- Edit
/etc/kubernetes/apiserverto appear as such. The service-cluster-ip-range IP addresses must be an unused block of addresses, not used anywhere else. They do not need to be routed or assigned to anything.
# 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://127.0.0.1:2379"
# Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
# Add your own!
KUBE_API_ARGS=""- Edit
/etc/etcd/etcd.confto let etcd listen on all available IPs instead of 127.0.0.1. If you have not done this, you might see an error such as “connection refused”.
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"- 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
doneConfigure the Kubernetes services on the node.
We need to configure the kubelet on the node.
- Edit
/etc/kubernetes/kubeletto appear as such:
###
# 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_ARGS="--cgroup-driver=systemd --kubeconfig=/etc/kubernetes/master-kubeconfig.yaml --require-kubeconfig"
# Add your own!
KUBELET_ARGS=""kind: Config
clusters:
- name: local
cluster:
server: http://fed-master:8080
users:
- name: kubelet
contexts:
- context:
cluster: local
user: kubelet
name: kubelet-context
current-context: kubelet-context- Start the appropriate services on the node (fed-node).
for SERVICES in kube-proxy kubelet docker; do
systemctl restart $SERVICES
systemctl enable $SERVICES
systemctl status $SERVICES
done- Check to make sure now the cluster can see the fed-node on fed-master, and its status changes to Ready.
kubectl get nodes
NAME STATUS AGE VERSION
fed-node Ready 4h- Deletion of nodes:
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.jsonYou should be finished!
The cluster should be running! Launch a test pod.
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.