feat!: for a single master node do not use etcd and add option to not use kube-vip

Signed-off-by: Devin Buhl <devin@buhl.casa>

bootstrap/configure.yaml

@@ -17,6 +17,12 @@
       ansible.builtin.set_fact:
         repository_path: "{{ repository.stdout }}"
 
+    - name: Override kube-vip address when there is a single master node and no address is defined
+      when: bootstrap_nodes.master | length == 1 and not bootstrap_kube_vip_addr
+      ansible.builtin.set_fact:
+        bootstrap_kube_vip_enabled: false
+        bootstrap_kube_vip_addr: "{{ bootstrap_nodes.master[0].address }}"
+
     - name: Verify configuration
       ansible.builtin.include_tasks: tasks/validation/main.yaml
 

bootstrap/tasks/validation/net.yaml

@@ -1,6 +1,6 @@
 ---
 - name: Set reachable address
-  set_fact:
+  ansible.builtin.set_fact:
     current_address: "{{ item.external_address | default(item.address) }}"
   loop: "{{ bootstrap_nodes.master + bootstrap_nodes.worker | default([]) }}"
   loop_control:
@@ -122,7 +122,19 @@
     success_msg: All IP addresses are unique.
     fail_msg: All IP addresses are not unique.
 
+- name: Verify nodes are not the same IPs as k8s_gateway or ingress external/internal
+  when: not bootstrap_kube_vip_enabled | default(true)
+  ansible.builtin.assert:
+    that: item.address not in (bootstrap_k8s_gateway_addr, bootstrap_external_ingress_addr, bootstrap_internal_ingress_addr)
+    success_msg: Node address {{ item.address }} is different than k8s_gateway or ingress-nginx.
+    fail_msg: Node address {{ item.address }} is not different than k8s_gateway or ingress-nginx.
+    quiet: true
+  loop: "{{ bootstrap_nodes.master + bootstrap_nodes.worker | default([]) }}"
+  loop_control:
+    label: "{{ item.address }}"
+
 - name: Verify nodes are not the same IPs as k8s_gateway, ingress external/internal or kube-vip
+  when: bootstrap_kube_vip_enabled | default(true)
   ansible.builtin.assert:
     that: item.address not in (bootstrap_k8s_gateway_addr, bootstrap_external_ingress_addr, bootstrap_internal_ingress_addr, bootstrap_kube_vip_addr)
     success_msg: Node address {{ item.address }} is different than k8s_gateway, ingress-nginx or kube-vip.
@@ -153,6 +165,34 @@
   loop_control:
     label: "{{ item.address }}"
 
+- name: Verify node IP addresses are unique
+  ansible.builtin.assert:
+    that: >
+      (
+        (bootstrap_nodes.master + bootstrap_nodes.worker | default([])) | map(attribute='address') | list
+      ) | unique | length
+      ==
+      (
+        (bootstrap_nodes.master + bootstrap_nodes.worker | default([])) | map(attribute='address') | list
+      ) | length
+    success_msg: All node IP addresses are unique.
+    fail_msg: All node IP addresses are not unique.
+    quiet: true
+
+- name: Verify node names are unique
+  ansible.builtin.assert:
+    that: >
+      (
+        (bootstrap_nodes.master + bootstrap_nodes.worker | default([])) | map(attribute='name') | list
+      ) | unique | length
+      ==
+      (
+        (bootstrap_nodes.master + bootstrap_nodes.worker | default([])) | map(attribute='name') | list
+      ) | length
+    success_msg: All node names are unique.
+    fail_msg: All node names are not unique.
+    quiet: true
+
 - name: Verify SSH port is reachable
   ansible.builtin.wait_for:
     host: "{{ current_address }}"

bootstrap/templates/addons/kube-prometheus-stack/app/helmvalues.yaml.j2

@@ -61,7 +61,7 @@ data:
             regex: (apiserver_response_sizes_bucket|apiserver_watch_events_sizes_bucket)
     kubeControllerManager:
       enabled: true
-      endpoints:
+      endpoints: &endpoints
       {% for item in bootstrap_nodes.master %}
         - {{ item.address }}
       {% endfor %}
@@ -72,17 +72,15 @@ data:
             sourceLabels: ["__name__"]
             regex: "(apiserver_audit|apiserver_client|apiserver_delegated|apiserver_envelope|apiserver_storage|apiserver_webhooks|attachdetach_controller|authenticated_user|authentication|cronjob_controller|disabled_metric|endpoint_slice|ephemeral_volume|garbagecollector_controller|get_token|go|hidden_metric|job_controller|kubernetes_build|kubernetes_feature|leader_election|node_collector|node_ipam|process_cpu|process_max|process_open|process_resident|process_start|process_virtual|pv_collector|registered_metric|replicaset_controller|rest_client|retroactive_storageclass|root_ca|running_managed|scrape_duration|scrape_samples|scrape_series|service_controller|storage_count|storage_operation|ttl_after|volume_operation|workqueue)_(.+)"
     kubeEtcd:
+      {% if bootstrap_nodes.master | length > 1 %}
       enabled: true
-      endpoints:
+      {% else %}
-      {% for item in bootstrap_nodes.master %}
+      enabled: false
-        - {{ item.address }}
+      {% endif %}
-      {% endfor %}
+      endpoints: *endpoints
     kubeScheduler:
       enabled: true
-      endpoints:
+      endpoints: *endpoints
-      {% for item in bootstrap_nodes.master %}
-        - {{ item.address }}
-      {% endfor %}
       serviceMonitor:
         metricRelabelings:
           # Remove duplicate labels provided by k3s

bootstrap/templates/ansible/inventory/group_vars/kubernetes/main.yaml.j2

@@ -9,13 +9,18 @@
 k3s_release_version: "v1.29.0+k3s1"
 k3s_install_hard_links: true
 k3s_become: true
+{% if bootstrap_nodes.master | length > 1 %}
 k3s_etcd_datastore: true
-k3s_use_unsupported_config: true
+{% else %}
+k3s_etcd_datastore: false
+{% endif %}
 k3s_registration_address: "{% raw %}{{ kube_vip_addr }}{% endraw %}"
 k3s_server_manifests_urls:
+  {% if bootstrap_kube_vip_enabled | default(true) %}
   # Kube-vip RBAC
   - url: https://raw.githubusercontent.com/kube-vip/kube-vip/main/docs/manifests/rbac.yaml
     filename: kube-vip-rbac.yaml
+  {% endif %}
   # Essential Prometheus Operator CRDs (the rest are installed with the kube-prometheus-stack helm release)
   - url: https://raw.githubusercontent.com/prometheus-operator/prometheus-operator/v0.70.0/example/prometheus-operator-crd/monitoring.coreos.com_podmonitors.yaml
     filename: custom-prometheus-podmonitors.yaml
@@ -32,6 +37,8 @@ k3s_server_manifests_templates:
   - custom-cilium-l2.yaml.j2
   {% endif %}
   - custom-coredns-helmchart.yaml.j2
+{% if bootstrap_kube_vip_enabled | default(true) %}
 # /var/lib/rancher/k3s/agent/pod-manifests
 k3s_server_pod_manifests_templates:
   - kube-vip-static-pod.yaml.j2
+{% endif %}

bootstrap/vars/config.sample.yaml

@@ -39,6 +39,7 @@ bootstrap_cloudflare_tunnel_id:
 # CIDR your nodes are on (e.g. 192.168.1.0/24)
 bootstrap_node_cidr:
 # The IP address to use with kube-vip, choose an available IP in your nodes network that is not being used
+# (Optional) Leave this blank if you are deploying a single master node, this will disable kube-vip and use the master node IP instead
 bootstrap_kube_vip_addr:
 # The Load balancer IP for k8s_gateway, choose an available IP in your nodes network that is not being used
 bootstrap_k8s_gateway_addr: