You should install VirtualBox and Vagrant before you start.
You should create a Vagrantfile in an empty directory with the following content:
Vagrant.configure("2") do |config|
config.vm.provider :virtualbox do |v|
v.memory = 1024
v.cpus = 1
end
config.vm.provision :shell, privileged: true, inline: $install_common_tools
config.vm.define :master do |master|
master.vm.box = "ubuntu/xenial64"
master.vm.hostname = "master"
master.vm.network :private_network, ip: "10.0.0.10"
master.vm.provision :shell, privileged: false, inline: $provision_master_node
end
%w{worker1 worker2}.each_with_index do |name, i|
config.vm.define name do |worker|
worker.vm.box = "ubuntu/xenial64"
worker.vm.hostname = name
worker.vm.network :private_network, ip: "10.0.0.#{i + 11}"
worker.vm.provision :shell, privileged: false, inline: <<-SHELL
sudo /vagrant/join.sh
echo 'Environment="KUBELET_EXTRA_ARGS=--node-ip=10.0.0.#{i + 11}"' | sudo tee -a /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
sudo systemctl daemon-reload
sudo systemctl restart kubelet
SHELL
end
end
config.vm.provision "shell", inline: $install_multicast
end
$install_common_tools = <<-SCRIPT
# bridged traffic to iptables is enabled for kube-router.
cat >> /etc/ufw/sysctl.conf <<EOF
net/bridge/bridge-nf-call-ip6tables = 1
net/bridge/bridge-nf-call-iptables = 1
net/bridge/bridge-nf-call-arptables = 1
EOF
# disable swap
swapoff -a
sed -i '/swap/d' /etc/fstab
# Install kubeadm, kubectl and kubelet
export DEBIAN_FRONTEND=noninteractive
apt-get -qq install ebtables ethtool
apt-get -qq update
apt-get -qq install -y docker.io apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get -qq update
apt-get -qq install -y kubelet kubeadm kubectl
SCRIPT
$provision_master_node = <<-SHELL
OUTPUT_FILE=/vagrant/join.sh
rm -rf $OUTPUT_FILE
# Start cluster
sudo kubeadm init --apiserver-advertise-address=10.0.0.10 --pod-network-cidr=10.244.0.0/16 | grep "kubeadm join" > ${OUTPUT_FILE}
chmod +x $OUTPUT_FILE
# Configure kubectl
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
# Fix kubelet IP
echo 'Environment="KUBELET_EXTRA_ARGS=--node-ip=10.0.0.10"' | sudo tee -a /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
# Configure flannel
curl -o kube-flannel.yml https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml
sed -i.bak 's|"/opt/bin/flanneld",|"/opt/bin/flanneld", "--iface=enp0s8",|' kube-flannel.yml
kubectl create -f kube-flannel.yml
sudo systemctl daemon-reload
sudo systemctl restart kubelet
SHELL
$install_multicast = <<-SHELL
apt-get -qq install -y avahi-daemon libnss-mdns
SHELLYou can create the cluster with:
$ vagrant upYou can delete the cluster with:
$ vagrant destroy -f
We use a similar script for running Kubernetes workshops at Learnk8s. Yes, domain resolution works, but we don't use the vanilla ubuntu image as it's not optimised for Vagrant (as you already realised). We use
bento/ubuntu-18.04.