K8s cluster for testing

This ansible roles help you create local k8s cluster with one master node and one worker node to VirtualBox infrastructure. What this roles do:

• Disable Selinux, swap and Firewalld
• Install ntpdate package and synchronize time for hosts
• Install iptables and configure rules for it
• Create user for docker and k8s
• Install docker and k8s to all hosts
• Initialize k8s cluster and join node to it
• Deploy CNI

IMPORTANT! Before using this roles:

• please configure hostnames for your hosts. The result of the next command should return correct ip address of the host

  $ hostname -i

• please sinchronize date and time for all your hosts (preparation role can failed if ntpdate port is in use)
• master node should have at least 2 CPU and 2Gb of memory
• change hosts in hosts.txt file according to your environment

You can also:

• change a lot of default variables in every appropriate file for every role
• use only the roles you need, roles are independent

Requirements:

• by default this cluster use Calico as a CNI, but you can change it in defaults file.
• role iptables open onle default ports for k8s and default ssh port, and close all other inpur rules
• default user for docker and k8s is "test", and config file for kubectl added only for this user (not for root)

Notes:

All this roles was tested on default VirtualBox virtual machines with CentOS. If you found any mistakes please let me know. I hope this roles help you and save some working time. I have tested this roles on GCP with CentOS 7 images and it works fine, but you need change apiserver-advertise-address in master_k8s role, because GCP engines use two network adapters (internal and external).