1 files changed, 46 insertions, 0 deletions
diff --git a/common/kubernetes-cluster-layout.yml b/common/kubernetes-cluster-layout.yml
new file mode 100644
index 00000000..64856fc5
--- /dev/null
+++ b/common/kubernetes-cluster-layout.yml
@@ -0,0 +1,46 @@
+---
+- name: create host groups for kubernetes cluster
+  hosts: "{{ kubernetes_cluster_layout.nodes_group }}"
+  connection: local
+  gather_facts: no
+  run_once: yes
+  tasks:
+  - name: sanity check - fail if masters are not included in nodes
+    assert:
+      msg: "the cluster node group '{{ kubernetes_cluster_layout.nodes_group }}' must include *all* nodes (master and non-master)"
+      that: kubernetes_cluster_layout.masters | difference(ansible_play_hosts_all) | length == 0
+
+  - name: sanity check - fail if primary master is not in masters
+    assert:
+      msg: "kubernetes_cluster_layout.masters must include kubernetes_cluster_layout.primary_master"
+      that: kubernetes_cluster_layout.primary_master is undefined or kubernetes_cluster_layout.primary_master in kubernetes_cluster_layout.masters
+
+  - name: sanity check - fail on multiple masters if no primary master is configured
+    assert:
+      msg: "For multiple masters to work you need to define kubernetes_cluster_layout.primary_master"
+      that: (kubernetes_cluster_layout.masters | length) == 1 or kubernetes_cluster_layout.primary_master is defined
+
+  - name: create group for all kubernetes nodes
+    loop: "{{ ansible_play_hosts_all }}"
+    add_host:
+      name: "{{ item }}"
+      inventory_dir: "{{ hostvars[item].inventory_dir }}"
+      group: _kubernetes_nodes_
+    changed_when: False
+
+  - name: create group for kubernetes master nodes
+    loop: "{{ kubernetes_cluster_layout.masters }}"
+    add_host:
+      name: "{{ item }}"
+      inventory_dir: "{{ hostvars[item].inventory_dir }}"
+      group: _kubernetes_masters_
+    changed_when: False
+
+  - name: create group for kubernetes primary master
+    vars:
+      item: "{{ kubernetes_cluster_layout.primary_master | default(kubernetes_cluster_layout.masters[0]) }}"
+    add_host:
+      name: "{{ item }}"
+      inventory_dir: "{{ hostvars[item].inventory_dir }}"
+      group: _kubernetes_primary_master_
+    changed_when: False