Ansible playbooks for deploying a 3 node Kubernetes cluster with 1 master node and 2 worker nodes. The default user
that will be used is k8sadmin so this user must exist on your servers (with sudo permissions).
Your local machine will need to have Ansible installed. This can be done with the following command:
brew install ansible
This project assumes that you have 3 Ubuntu servers set up and configured with access via ssh keys and configured in
your ~/.ssh/config file.
Because the installation of Kubernetes requires the ability to run commands as root, you will need to be able to sudo on the servers without a password.
This can be done by running the following command on each of the servers:
echo "<username> ALL=(ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/<username>
The ansible playbooks deploy metallb as the load balancer for the cluster. This requires that you have a range of IP defined in a config map.
Create a file in the repository named metallb-config.yaml with the following contents (replacing the IP addresses):
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
name: default
namespace: metallb-system
spec:
addresses:
- 192.168.0.150-192.168.0.170
---
apiVersion: metallb.io/v1beta1
kind: L2Advertisement
metadata:
name: l2advertisement
namespace: metallb-system
spec:
ipAddressPools:
- default
Host master
HostName <master-ip>
User ubuntu
Host worker-1
HostName <worker-1-ip>
User ubuntu
Host worker-2
HostName <worker-2-ip>
User ubuntu
You will need to create a hosts file in the root of the project with the following contents:
[master]
<master>
[worker]
<worker-1>
<worker-2>
You can then test that Ansible can connect to the servers with the following command:
ansible -i hosts all -m ping
The playbooks can be run with the following command:
ansible-playbook -i hosts install.yaml
Once the playbook has completed you should have a fully functional Kubernetes cluster!