Add option to override server provider default DNS nameservers

changelog/items/other/override-default-nameservers.md

@@ -0,0 +1 @@
+- Add option to override server provider default DNS nameservers.

playbooks/group_vars/webportals.yml

@@ -214,6 +214,18 @@ webportal_common_config_defaults:
 # TODO: default to: False
 webportal_setup_health_checks: True
 
+# Define custom nameservers to be used to optionally override hosting provider
+# defaults.
+# NOTE: Be sure to check with server provider if it ok to just override
+# nameservers in /etc/resolve.conf. To override default nameservers define a
+# following var for a host or a group in your inventory hosts.ini:
+# etc_resolve_conf_override="{{ etc_resolve_conf_custom_nameservers }}"
+
+etc_resolve_conf_custom_nameservers: |
+  # Custom nameservers override
+  nameserver 1.1.1.1
+  nameserver 8.8.8.8
+
 # =============================================================================
 # Portal deploy settings (on running server)
 

playbooks/tasks/dns-resolver-set-nameservers.yml

@@ -0,0 +1,8 @@
+---
+# Override hosting provider nameservers
+
+- name: Override default hosting provider nameservers
+  ansible.builtin.copy:
+    dest: "/etc/resolv.conf"
+    content: "{{ etc_resolve_conf_override }}"
+  become: True

playbooks/tasks/portal-setup-server.yml

@@ -73,3 +73,14 @@
     replace: '# \1'
     backup: yes
   become: True
+
+# Override default DNS nameservers
+
+# E.g. Novogara server provider has default DNS provider set to local 'unbound'
+# DNS caching resolver, but it doesn't seem to be configured correctly and it
+# creates issues resolving some dnslink domains (e.g. sia-storage.net). So we
+# override server provider resolver config with our custom nameservers config.
+
+- name: Include setting custom DNS nameservers
+  include_tasks: tasks/dns-resolver-set-nameservers.yml
+  when: etc_resolve_conf_override is defined