There are six node layout types: default, separate, ha, scale, all-in-one, and node-etcd-client.
default is a non-HA two nodes setup with one separate kube_node
and the etcd group merged with the kube_control_plane.
separate layout is when there is only node of each type, which includes
a kube_control_plane, kube_node, and etcd cluster member.
ha layout consists of two etcd nodes, two control planes and a single worker node,
with role intersection.
scale layout can be combined with above layouts (ha-scale, separate-scale). It includes 200 fake hosts
in the Ansible inventory. This helps test TLS certificate generation at scale
to prevent regressions and profile certain long-running tasks. These nodes are
never actually deployed, but certificates are generated for them.
all-in-one layout use a single node for with kube_control_plane, etcd and kube_node merged.
node-etcd-client layout consists of a 4 nodes cluster, all of them in kube_node, first 3 in etcd and only one kube_control_plane.
This is necessary to tests setups requiring that nodes are etcd clients (use of cilium as network_plugin for instance)
Note, the canal network plugin deploys flannel as well plus calico policy controller.
The CI Matrix displays OS, Network Plugin and Container Manager tested.
All tests are breakdown into 3 "stages" ("Stage" means a build step of the build pipeline) as follows:
- unit_tests: Linting, markdown, vagrant & terraform validation etc...
- part1: Molecule and AIO tests
- part2: Standard tests with different layouts and OS/Runtime/Network
- part3: Upgrade jobs, terraform jobs and recover control plane tests
- special: Other jobs (manuals)
The steps are ordered as unit_tests->part1->part2->part3->special.