telgraf: Fix config folder permissions

With the recent update to telegraf's container image it now runs under its own user and thus we need to change the permissions to make the config file accessible for the new user.

See https://github.com/influxdata/influxdata-docker/pull/536

roles/telegraf/defaults/main.yml

@@ -27,8 +27,15 @@ telegraf_config_location: "{{ telegraf_install_location }}/conf"
 telegraf_version: "1.20.3"
 # renovate: depName=quay.io/sheogorath/docker-socket-proxy
 telegraf_dockersocketproxy_version: "2.3"
+# Changing this image may also require changing the UID / GID below,
+# to set the correct permissions
 telegraf_image_version: "{{ telegraf_version }}-alpine"
 
+# Telegraf config user & group id
+# This is used for the config folder that is mounted to the container
+telegraf_config_uid: 100
+telegraf_config_gid: 101
+
 # The influxdb endpoints, telegraf should send data to
 telegraf_influxdb_endpoints:
   - influxdb.example.com

roles/telegraf/tasks/main.yml

@@ -41,8 +41,8 @@
   file:
     path: "{{ item }}"
     mode: '0700'
-    owner: 'root'
-    group: 'root'
+    owner: "{{ telegraf_config_uid }}"
+    group: "{{ telegraf_config_gid }}"
     state: directory
     setype: "container_file_t"
   with_items:
@@ -63,9 +63,9 @@
   template:
     src: "telegraf.conf"
     dest: "{{ telegraf_config_location }}/telegraf.conf"
-    mode: '0644'
-    owner: 'root'
-    group: 'root'
+    mode: '0600'
+    owner: "{{ telegraf_config_uid }}"
+    group: "{{ telegraf_config_gid }}"
   notify: "Restart telegraf"
   become: true