Make sure to remove configuration files that are no longer needed (#121)

* Make sure to remove configuration files that are no longer needed

Make sure the role specific configuration file is removed if the instace
no longer has the role

Do the same for the custom configuration file

Fixes: #120

* Add nomad_allow_purge_config with default false to avoid an undesired cleanup

Author: ygalblum

README.md

@@ -41,6 +41,10 @@ The role defines most of its variables in `defaults/main.yml`:
 - Allow running the role even if not all instances are connected
 - Default value: **no**
 
+### `nomad_allow_purge_config`
+- Allow purging obsolete configuration files. For example, remove server configuration if instance is no longer a server
+- Default value: **no**
+
 ### `nomad_version`
 
 - Nomad version to install

defaults/main.yml

@@ -26,6 +26,9 @@ nomad_debug: false
 ## Asserts
 nomad_skip_ensure_all_hosts: "{{ lookup('env','NOMAD_SKIP_ENSURE_ALL_HOSTS') | default('false', true) }}"
 
+## Config Purge
+nomad_allow_purge_config: "{{ lookup('env','NOMAD_ALLOW_PURGE_CONFIG') | default('false', true) }}"
+
 ### Package
 nomad_version: "{{ lookup('env','NOMAD_VERSION') | default('0.12.1', true) }}"
 nomad_architecture_map:

tasks/main.yml

@@ -89,6 +89,16 @@
   notify:
     - restart nomad
 
+- name: Remove Server configuration
+  file:
+    dest: "{{ nomad_config_dir }}/server.hcl"
+    state: absent
+  when:
+    - nomad_allow_purge_config | bool
+    - not _nomad_node_server | bool
+  notify:
+    - restart nomad
+
 - name: Client configuration
   template:
     src: client.hcl.j2
@@ -101,6 +111,16 @@
   notify:
     - restart nomad
 
+- name: Remove Client configuration
+  file:
+    dest: "{{ nomad_config_dir }}/client.hcl"
+    state: absent
+  when:
+    - nomad_allow_purge_config | bool
+    - not _nomad_node_client | bool
+  notify:
+    - restart nomad
+
 - name: Custom configuration
   template:
     src: custom.json.j2
@@ -113,6 +133,16 @@
   notify:
     - restart nomad
 
+- name: Remove custome configuration
+  file:
+    dest: "{{ nomad_config_dir }}/custom.json"
+    state: absent
+  when:
+    - nomad_allow_purge_config | bool
+    - nomad_config_custom is not defined
+  notify:
+    - restart nomad
+
 - name: Host volume
   include: host_volume.yml