Setup

Requirements

• Virtualbox or libvirt (kvm)
• Vagrant
• openssh-sftp-server

Host Setup

You may need to change the value of the BRIDGE envvar depending on your actual setup

Steps

Creating the environment

1. vagrant up (or vagrant up --provider=$YOUR_PREFERRED_PROVIDER)
2. have a coffee

Installing Kubernetes (with Calico)

1. vagrang ssh (will get you to the control VM)

2. run ansible playbooks

cd src/ansible`
ansible-playbook apt.yml
ansible-playbook base.yml
ansible-playbook no-swap.yml
ansible-playbook master.yml
ansible-playbook node.yml
ansible-playbook control.yml

Using a specific Kubernetes control plane version

Replace

ansible-playbook master.yml

with

ansible-playbook master.yml -e k8s_extra_opts="--kubernetes-version=v1.19.2"

Misc

aliases

in the control VM, these aliases will prove useful:

echo "alias each='ansible -e ansible_become=yes all -a'"  
echo "alias keach='ansible -e ansible_become=yes k8s -a'" 

reset cluster

• keep an eye on non master nodes

watch -n1 kubectl get node -l "'kubernetes.io/hostname != master'"

• reset non master nodes then the master

keach 'kubeadm -f reset' --limit k8s-nodes
k delete node -l kubernetes.io/hostname=master-

• reset netfilter tables

keach 'sh -c "iptables -P INPUT ACCEPT ; iptables -P FORWARD ACCEPT ; iptables -P OUTPUT ACCEPT ; iptables -t nat -F ; iptables -t mangle -F ; iptables -F ; iptables -X"'

• check netfilter tables status

keach 'iptables -vnL'