Kubernetes requires a set of machines to host the Kubernetes control plane and the worker nodes where containers are ultimately run. In this lab you will provision the compute resources required for running a secure and highly available Kubernetes cluster.
The Kubernetes networking model assumes a flat network in which containers and nodes can communicate with each other. In cases where this is not desired network policies can limit how groups of containers are allowed to communicate with each other and external network endpoints.
Each machine uses two network interface, one for access the Internet with type "NAT", the other for Kubernetes internal communication with type "Host-only Adapter".
The compute instances in this lab will be provisioned using Ubuntu Server 16.04, which has good support for the cri-containerd container runtime. Each compute instance will be provisioned with a fixed private IP address to simplify the Kubernetes bootstrapping process.
vagrant up
output
Bringing machine 'controller-0' up with 'virtualbox' provider...
Bringing machine 'controller-1' up with 'virtualbox' provider...
Bringing machine 'controller-2' up with 'virtualbox' provider...
Bringing machine 'worker-0' up with 'virtualbox' provider...
Bringing machine 'worker-1' up with 'virtualbox' provider...
Bringing machine 'worker-2' up with 'virtualbox' provider...
...
...
List the compute instances:
vagrant status
output
controller-0 running (virtualbox)
controller-1 running (virtualbox)
controller-2 running (virtualbox)
worker-0 running (virtualbox)
worker-1 running (virtualbox)
worker-2 running (virtualbox)
When Vagrant creates a virtual machine, it executes the deployment script heartbeat.sh, and uses heartbeat to configure VIPs on three controller nodes: 192.168.100.100. This IP is used for external access to Kubernetes.
ping -c 1 192.168.100.100
output
PING 192.168.100.100 (192.168.100.100): 56 data bytes
64 bytes from 192.168.100.100: icmp_seq=0 ttl=64 time=0.438 ms
--- 192.168.100.100 ping statistics ---
1 packets transmitted, 1 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.438/0.438/0.438/0.000 ms