preflight_facts: fixing inability to disable kubernetes

CHANGELOG-0.6.md

@@ -5,6 +5,7 @@
 ### Fixed
 
 - [#1154](https://github.com/epiphany-platform/epiphany/issues/1154) - Node exporter is not installed on logging vms
+- [#1183](https://github.com/epiphany-platform/epiphany/issues/1183) - Task 'Check if /etc/kubernetes/admin.conf file exists' fails when kubernetes\_master.count = 0
 
 ## [0.6.0] 2020-04-06
 

CHANGELOG-0.7.md

@@ -22,6 +22,7 @@
 - [#1181](https://github.com/epiphany-platform/epiphany/issues/1181) - Configure Ignite to use fixed ports
 - [#1182](https://github.com/epiphany-platform/epiphany/issues/1182) - Re-run single machine installation may fail
 - [#1209](https://github.com/epiphany-platform/epiphany/issues/1209) - Can not apply cluster, "sudo: a password is required"
+- [#1183](https://github.com/epiphany-platform/epiphany/issues/1183) - Task 'Check if /etc/kubernetes/admin.conf file exists' fails when kubernetes\_master.count = 0
 
 ### Known Issues
 

core/src/epicli/data/common/ansible/playbooks/roles/image_registry/tasks/gather-facts.yml

@@ -2,4 +2,7 @@
 - name: Produce final list of hosts to deploy image registries on
   set_fact:
     target_image_registry_hostnames: >-
-      {{ groups.image_registry | difference(groups.kubernetes_master) | union([resolved_image_registry_hostname]) | unique }}
+      {{ groups.image_registry | difference(available_masters) | union([resolved_image_registry_hostname]) | unique }}
+  vars:
+    available_masters: >-
+      {{ groups.kubernetes_master | default([]) }}

core/src/epicli/data/common/ansible/playbooks/roles/preflight_facts/tasks/assert.yml

@@ -13,7 +13,7 @@
         fail_msg: "When promote_to_ha is enabled, use_ha_control_plane must be enabled as well."
 
     - assert:
-        that: not promote_to_ha or ((groups.kubernetes_master | length) == 1)
+        that: not promote_to_ha or ((available_masters | length) == 1)
         fail_msg: "When promote_to_ha is enabled, control plane must contain exactly one master."
 
     - assert:
@@ -25,5 +25,5 @@
         fail_msg: "When kubernetes is HA already, use_ha_control_plane must be enabled (downgrade is not supported)."
 
     - assert:
-        that: use_ha_control_plane or not ((groups.kubernetes_master | length) > 1)
+        that: use_ha_control_plane or not ((available_masters | length) > 1)
         fail_msg: "When use_ha_control_plane is disabled, number of masters must not be bigger than one."

core/src/epicli/data/common/ansible/playbooks/roles/preflight_facts/tasks/kubernetes.yml

@@ -1,5 +1,10 @@
 ---
-- when: inventory_hostname in groups.kubernetes_master
+- name: Collect available masters
+  set_fact:
+    available_masters: >-
+      {{ groups.kubernetes_master | default([]) }}
+
+- when: inventory_hostname in available_masters
   block:
     - name: Check if /etc/kubernetes/admin.conf file exists
       stat:
@@ -37,8 +42,8 @@
 - name: Collect registered masters
   set_fact:
     registered_masters: >-
-      {{ groups.kubernetes_master | map('extract', hostvars, ['master_already_joined'])
-      | zip(groups.kubernetes_master)
+      {{ available_masters | map('extract', hostvars, ['master_already_joined'])
+      | zip(available_masters)
       | selectattr(0)
       | map(attribute=1)
       | list }}

core/src/epicli/data/common/ansible/playbooks/roles/repository/tasks/gather-facts.yml

@@ -2,4 +2,7 @@
 - name: Produce final list of hosts to deploy repositories on
   set_fact:
     target_repository_hostnames: >-
-      {{ groups.repository | difference(groups.kubernetes_master) | union([resolved_repository_hostname]) | unique }}
+      {{ groups.repository | difference(available_masters) | union([resolved_repository_hostname]) | unique }}
+  vars:
+    available_masters: >-
+      {{ groups.kubernetes_master | default([]) }}

core/src/epicli/data/common/validation/epiphany-cluster.yml

@@ -1,116 +1,126 @@
-"$id": "#/specification"
-title: "Cluster specification schema"
-description: "The main cluster specification"
-type: object
-required: 
-  - name
-  - admin_user
-  - components
-properties: 
-  prefix: 
-    "$id": "#/properties/prefix"
-    title: "Cluster prefix"
-    description: "A prefix the can be prepended to the cluster name"
-    examples: 
-      - prod01
-      - dev02
-      - test03
-      - cust04
-    type: string
-    pattern: "^[a-z0-9]{2,8}$"
-  name: 
-    "$id": "#/properties/name"
-    title: "Cluster name"
-    description: "The name of the cluster"
-    examples: 
-      - clustername01
-    type: string
-    pattern: "^[a-z0-9\\-]{3,20}$"
-  admin_user: 
-    "$id": "#/properties/admin_user"
-    title: "The admin_user Schema"
-    description: "Settings needed for the SSH connection to the cluster machines or VM's"
-    type: object
-  cloud:
-    "$id": "#/properties/specification/properties/cloud"
-    type: object
-    title: The Cloud Schema
-    properties:
-      subscription_name:
-        "$id": "#/properties/specification/properties/cloud/properties/subscription_name"
-        type: string
-        title: The Subscription_name Schema
-        default: ''
-        examples:
-        - subsciptionname
-        pattern: "^(.*)$"
-      vnet_address_pool:
-        "$id": "#/properties/specification/properties/cloud/properties/vnet_address_pool"
-        type: string
-        title: The Vnet_address_pool Schema
-        default: ''
-        examples:
-        - 10.1.0.0/20
-        pattern: "^(.*)$"
-      use_public_ips:
-        "$id": "#/properties/specification/properties/cloud/properties/use_public_ips"
-        type: boolean
-        title: The Use_public_ips Schema
-        default: false
-        examples:
-        - false
-      use_service_principal:
-        "$id": "#/properties/specification/properties/cloud/properties/use_service_principal"
-        type: boolean
-        title: The Use_service_principal Schema
-        default: false
-        examples:
-        - false
-      region:
-        "$id": "#/properties/specification/properties/cloud/properties/region"
-        type: string
-        title: The Region Schema
-        default: ''
-        examples:
-        - eu-west-2
-        pattern: "^(.*)$"
-      credentials:
-        "$id": "#/properties/specification/properties/cloud/properties/credentials"
-        type: object
-        title: The Credentials Schema
-        required:
-        - key
-        - secret
-        properties:
-          key:
-            "$id": "#/properties/specification/properties/cloud/properties/credentials/properties/key"
-            type: string
-            title: The Key Schema
-            pattern: "^(.*)$"
-          secret:
-            "$id": "#/properties/specification/properties/cloud/properties/credentials/properties/secret"
-            type: string
-            title: The Secret Schema
-            pattern: "^(.*)$"
-      network:
-        "$id": "#/properties/specification/properties/cloud/properties/network"
-        type: object
-        title: The Network Schema
-        properties:
-          use_network_security_groups:
-            "$id": "#/properties/specification/properties/cloud/properties/network/properties/use_network_security_groups"
-            type: boolean
-            title: The Use_network_security_groups Schema
-            default: false
-            examples:
-            - true
-  components: 
-    "$id": "#/properties/components"
-    title: "Components schema"
-    description: "Cluster component layout specification"
-    type: object
-
-
-
-
-
+"$id": "#/specification"
+title: "Cluster specification schema"
+description: "The main cluster specification"
+type: object
+required:
+  - name
+  - admin_user
+  - components
+properties:
+  prefix:
+    "$id": "#/properties/prefix"
+    title: "Cluster prefix"
+    description: "A prefix the can be prepended to the cluster name"
+    examples:
+      - prod01
+      - dev02
+      - test03
+      - cust04
+    type: string
+    pattern: "^[a-z0-9]{2,8}$"
+  name:
+    "$id": "#/properties/name"
+    title: "Cluster name"
+    description: "The name of the cluster"
+    examples:
+      - clustername01
+    type: string
+    pattern: "^[a-z0-9\\-]{3,20}$"
+  admin_user:
+    "$id": "#/properties/admin_user"
+    title: "The admin_user Schema"
+    description: "Settings needed for the SSH connection to the cluster machines or VM's"
+    type: object
+  cloud:
+    "$id": "#/properties/specification/properties/cloud"
+    type: object
+    title: The Cloud Schema
+    properties:
+      subscription_name:
+        "$id": "#/properties/specification/properties/cloud/properties/subscription_name"
+        type: string
+        title: The Subscription_name Schema
+        default: ''
+        examples:
+        - subsciptionname
+        pattern: "^(.*)$"
+      vnet_address_pool:
+        "$id": "#/properties/specification/properties/cloud/properties/vnet_address_pool"
+        type: string
+        title: The Vnet_address_pool Schema
+        default: ''
+        examples:
+        - 10.1.0.0/20
+        pattern: "^(.*)$"
+      use_public_ips:
+        "$id": "#/properties/specification/properties/cloud/properties/use_public_ips"
+        type: boolean
+        title: The Use_public_ips Schema
+        default: false
+        examples:
+        - false
+      use_service_principal:
+        "$id": "#/properties/specification/properties/cloud/properties/use_service_principal"
+        type: boolean
+        title: The Use_service_principal Schema
+        default: false
+        examples:
+        - false
+      region:
+        "$id": "#/properties/specification/properties/cloud/properties/region"
+        type: string
+        title: The Region Schema
+        default: ''
+        examples:
+        - eu-west-2
+        pattern: "^(.*)$"
+      credentials:
+        "$id": "#/properties/specification/properties/cloud/properties/credentials"
+        type: object
+        title: The Credentials Schema
+        required:
+        - key
+        - secret
+        properties:
+          key:
+            "$id": "#/properties/specification/properties/cloud/properties/credentials/properties/key"
+            type: string
+            title: The Key Schema
+            pattern: "^(.*)$"
+          secret:
+            "$id": "#/properties/specification/properties/cloud/properties/credentials/properties/secret"
+            type: string
+            title: The Secret Schema
+            pattern: "^(.*)$"
+      network:
+        "$id": "#/properties/specification/properties/cloud/properties/network"
+        type: object
+        title: The Network Schema
+        properties:
+          use_network_security_groups:
+            "$id": "#/properties/specification/properties/cloud/properties/network/properties/use_network_security_groups"
+            type: boolean
+            title: The Use_network_security_groups Schema
+            default: false
+            examples:
+            - true
+  components:
+    "$id": "#/properties/components"
+    type: object
+    title: "Components schema"
+    description: "Cluster component layout specification"
+    # When "kubernetes_node" property exists, "kubernetes_master" must exist as well
+    dependencies:
+      kubernetes_node: [kubernetes_master]
+    allOf:
+      # When no master is deployed, there must be no nodes deployed as well
+      - if:
+          properties:
+            kubernetes_master:
+              properties:
+                count: { type: integer, enum: [0] }
+        then:
+          properties:
+            kubernetes_node:
+              properties:
+                count: { type: integer, enum: [0] }