Refactor caching-nameserver.yml for consistency and clarity in variable naming

roles/common/tasks/caching-nameserver.yml

@@ -1,4 +1,3 @@
-
 ---
 # ---
 # Install 'bind' apt based OS
@@ -7,7 +6,7 @@
 - name: (caching-nameserver.yml) update
   ansible.builtin.apt:
     update_cache: true
-    cache_valid_time: "{{ 0 if apt_config_updated is defined and apt_config_updated.changed else apt_update_cache_valid_time }}"
+    cache_valid_time: "{{ 0 if common_apt_config_updated is defined and common_apt_config_updated.changed else apt_update_cache_valid_time }}"
   when:
     - ansible_facts["distribution"] == "Debian"
     - apt_update|bool
@@ -16,9 +15,9 @@
 
 - name: (caching-nameserver.yml) Configure any half-installed packages 'dpkg --configure -a'
   ansible.builtin.command: dpkg --configure -a
-  register: _dpkg_configure
-  changed_when: (_dpkg_configure.stdout | default('')) | length > 0
-  failed_when: _dpkg_configure.rc != 0
+  register: common_dpkg_configure
+  changed_when: (common_dpkg_configure.stdout | default('')) | length > 0
+  failed_when: common_dpkg_configure.rc != 0
   when:
     - ansible_facts["distribution"] == "Debian"
     - apt_update|bool
@@ -42,7 +41,7 @@
     state: present
   when:
     - ansible_facts["distribution"] == "Debian"
-    - install_bind_packages|bool == true
+    - install_bind_packages|bool
   tags:
     - apt-caching-nameserver
 
@@ -53,9 +52,9 @@
 - name: (yum.yml) Install system updates for centos systems
   ansible.builtin.dnf:
     name: "*"
-    state: latest
+    state: present
     update_cache: true
-    #cache_valid_time: 3600
+    # cache_valid_time: 3600
   when:
     - ansible_facts.os_family == "RedHat"
     - ansible_facts["distribution"] == "CentOS"
@@ -94,7 +93,7 @@
     owner: root
     group: bind
     mode: "0644"
-    #validate: visudo -cf %s
+    # validate: visudo -cf %s
   notify: Reload bind9
   tags:
     - apt-caching-nameserver
@@ -110,7 +109,7 @@
 - name: Check if file '/etc/bind/named.conf.options' exists
   ansible.builtin.stat:
     path: /etc/bind/named.conf.options
-  register: file_named_conf_options
+  register: common_file_named_conf_options
 
 - name: (caching-nameserver.yml) update named.conf.options configuration file (gateway server)
   ansible.builtin.template:
@@ -120,7 +119,7 @@
     owner: root
     group: bind
     mode: "0644"
-    #validate: visudo -cf %s
+    # validate: visudo -cf %s
   notify: Reload bind9
   tags:
     - apt-caching-nameserver
@@ -128,7 +127,7 @@
   when:
     - ansible_facts["distribution"] == "Debian"
     - inventory_hostname in groups["gateway_server"]
-#    - not file_named_conf_options.stat.exists
+#    - not common_file_named_conf_options.stat.exists
 
 # --------------------