27b59c6df6
Sometimes multinode nodesets consist of nodes with private IPs from different L2 segments. So they can not communicate with each other using their IPs assigned to their gateway interfaces. This PR sets up VXLAN overlay using nodes inventory public IPs (those IPs used by zuul to get access to nodes). So nodes are convinced they are in the same L2 segment. We can use this overlay for internal K8s communication. For this we have to disable overlay setup in a CNI implementation (Calico, Cilium, etc.) and use the overlay interface for internal Openstack communication. Also: - Upgrade Kubeadm config API version to kubeadm.k8s.io/v1beta4 - Ignore single cpu kubeadm errors. By default Kubeadm requires at least 2 cpus on nodes. Change-Id: I34663de277951135c44607f093f8f1f93eafab86 Signed-off-by: Vladimir Kozhukalov <kozhukalov@gmail.com>
This role is used to deploy test environment which includes
- install necessary prerequisites including Helm
- deploy Containerd and a container runtime for Kubernetes
- deploy Kubernetes using Kubeadm with a single control plane node
- install Calico as a Kubernetes networking
- establish tunnel between primary node and K8s control plane ndoe
The role works both for single-node and multi-node inventories. The role
totally relies on inventory groups. The primary and k8s_control_plane
groups must include only one node and this can be the same node for these two
groups.
The primary group is where we install kubectl and helm CLI tools.
You can consider this group as a deployer's machine.
The k8s_control_plane is where we deploy the K8s control plane.
The k8s_cluster group must include all the K8s nodes including control plane
and worker nodes.
In case of running tests on a single-node environment the group k8s_nodes
must be empty. This means the K8s cluster will consist of a single control plane
node where all the workloads will be running.
See for example:
all:
vars:
ansible_port: 22
ansible_user: ubuntu
ansible_ssh_private_key_file: /home/ubuntu/.ssh/id_rsa
ansible_ssh_extra_args: -o StrictHostKeyChecking=no
hosts:
primary:
ansible_host: 10.10.10.10
node-1:
ansible_host: 10.10.10.11
node-2:
ansible_host: 10.10.10.12
node-3:
ansible_host: 10.10.10.13
children:
primary:
hosts:
primary:
k8s_cluster:
hosts:
node-1:
node-2:
node-3:
k8s_control_plane:
hosts:
node-1:
k8s_nodes:
hosts:
node-2:
node-3: