Allow use with multiple server Trellis

README.md

@@ -46,12 +46,13 @@ Install [New Relic PHP agent](https://docs.newrelic.com/docs/agents/php-agent) o
 ## Role Variables
 
 ```yaml
-# group_vars/<environment>/vault.yml
+# group_vars/<environment>/vault.yml or host_vars/<host>/vault.yml
 # This file should be encrypted. See: https://roots.io/trellis/docs/vault/
 ##########################################################################
 
 # New Relic License Key
 ## See: https://docs.newrelic.com/docs/accounts-partnerships/accounts/account-setup/license-key
+# vault_newrelic_license: false
 vault_newrelic_license: xxxxxxxxxxx
 
 # group_vars/<environment>/main.yml
@@ -105,6 +106,10 @@ Add this role to `requirements.yml`:
 
 Run `$ ansible-galaxy install -r requirements.yml` to install this new role.
 
+## Multiple servers
+
+As an alternative to setting the license key for an environment under `group_vars` you can set it for a single server under `host_vars`. You can explicitly set `false` to skip a group or host, or omit the variable from the vault file. A warning will be shown when setup is skipped.
+
 ## Common Errors
 
 ### `vault_newrelic_license` is not defined

defaults/main.yml

@@ -1,7 +1,9 @@
 newrelic_package_state: latest
 
+newrelic_license: "{{ vault_newrelic_license | default(false) }}"
+
 newrelic_config_default:
-  license: "{{ vault_newrelic_license }}"
+  license: "{{ newrelic_license }}"
   appname: "{{ wordpress_sites.keys() | first }} {{ env }}"
   framework: wordpress
   logfile: /var/log/newrelic/php_agent.log

tasks/main.yml

@@ -1,8 +1,11 @@
 ---
-- name: Fail if vault_newrelic_license is not defined
-  fail:
-    msg: vault_newrelic_license is not defined
-  when: vault_newrelic_license is not defined
+- name: Warn if vault_newrelic_license is not defined
+  debug:
+      msg: |
+        Note: Skipping New Relic tasks. vault_newrelic_license is not set. Make sure this is set in vault.yml.
+  when: newrelic_license == false
 
 - include: install.yml
+  when: newrelic_license != false
 - include: ini.yml
+  when: newrelic_license != false