Refactor: Organize Ansible project structure

- Reorganized Ansible project structure to follow best practices.
- Created dedicated directories: , , , , and .
- Categorized playbooks into  (host-specific) and  (service-specific).
- Moved all roles into the  directory and standardized their naming conventions.
- Relocated  to  for better variable management.
- Renamed  to  to reflect its global variable scope.
- Created  to correctly set the  to the new  directory.
- Moved  and  into the  directory.
- Added  to  providing explanations for common commands.
- Cleaned up  directories from all individual roles to centralize version control.

roles/template_differ/README.md

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+Role Name
+=========
+
+A brief description of the role goes here.
+
+Requirements
+------------
+
+Any pre-requisites that may not be covered by Ansible itself or the role should be mentioned here. For instance, if the role uses the EC2 module, it may be a good idea to mention in this section that the boto package is required.
+
+Role Variables
+--------------
+
+A description of the settable variables for this role should go here, including any variables that are in defaults/main.yml, vars/main.yml, and any variables that can/should be set via parameters to the role. Any variables that are read from other roles and/or the global scope (ie. hostvars, group vars, etc.) should be mentioned here as well.
+
+Dependencies
+------------
+
+A list of other roles hosted on Galaxy should go here, plus any details in regards to parameters that may need to be set for other roles, or variables that are used from other roles.
+
+Example Playbook
+----------------
+
+Including an example of how to use your role (for instance, with variables passed in as parameters) is always nice for users too:
+
+    - hosts: servers
+      roles:
+         - { role: username.rolename, x: 42 }
+
+License
+-------
+
+BSD
+
+Author Information
+------------------
+
+An optional section for the role authors to include contact information, or a website (HTML is not allowed).

roles/template_differ/defaults/main.yml

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+#SPDX-License-Identifier: MIT-0
+---
+# defaults file for template-differ

roles/template_differ/handlers/main.yml

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+---
+- name: networking restart
+  service:
+    name: networking
+    state: restarted
+
+- name: sshd restart
+  service:
+    name: sshd
+    state: restarted

roles/template_differ/meta/main.yml

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+#SPDX-License-Identifier: MIT-0
+galaxy_info:
+  author: your name
+  description: your role description
+  company: your company (optional)
+
+  # If the issue tracker for your role is not on github, uncomment the
+  # next line and provide a value
+  # issue_tracker_url: http://example.com/issue/tracker
+
+  # Choose a valid license ID from https://spdx.org - some suggested licenses:
+  # - BSD-3-Clause (default)
+  # - MIT
+  # - GPL-2.0-or-later
+  # - GPL-3.0-only
+  # - Apache-2.0
+  # - CC-BY-4.0
+  license: license (GPL-2.0-or-later, MIT, etc)
+
+  min_ansible_version: 2.1
+
+  # If this a Container Enabled role, provide the minimum Ansible Container version.
+  # min_ansible_container_version:
+
+  galaxy_tags: []
+    # List tags for your role here, one per line. A tag is a keyword that describes
+    # and categorizes the role. Users find roles by searching for tags. Be sure to
+    # remove the '[]' above, if you add tags to this list.
+    #
+    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
+    #       Maximum 20 tags per role.
+
+dependencies: []
+  # List your role dependencies here, one per line. Be sure to remove the '[]' above,
+  # if you add dependencies to this list.

roles/template_differ/tasks/main.yml

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+#SPDX-License-Identifier: MIT-0
+---
+# tasks file for template-differ
+
+- name: Remove old ssh host keys
+  ansible.builtin.file:
+    path: /etc/ssh/ssh_host_*
+    state: absent
+
+- name: Generate SSH host keys
+  shell: ssh-keygen -A
+
+- name: Set a hostname
+  ansible.builtin.hostname:
+    name: "{{ new_hostname }}"
+
+
+- name: Interface IP change
+  template:
+    src: ../templates/interfaces
+    dest: /etc/network/interfaces
+    owner: root
+    group: root
+    mode: '0644'
+
+- name: Etc hosts change
+  template:
+    src: ../templates/hosts
+    dest: /etc/hosts
+    owner: root
+    group: root
+    mode: '0644'
+
+- name: sshd restart
+  service:
+    name: sshd
+    state: restarted
+
+- name: networking restart
+  service:
+    name: networking
+    state: restarted

roles/template_differ/templates/hosts

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+127.0.0.1	localhost
+{{ ip }}	{{ new_hostname }}
+
+# The following lines are desirable for IPv6 capable hosts
+::1     localhost ip6-localhost ip6-loopback
+ff02::1 ip6-allnodes
+ff02::2 ip6-allrouters

roles/template_differ/templates/interfaces

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+# This file describes the network interfaces available on your system
+# and how to activate them. For more information, see interfaces(5).
+
+source /etc/network/interfaces.d/*
+
+# The loopback network interface
+auto lo
+iface lo inet loopback
+
+# The primary network interface
+allow-hotplug {{ interface_name }}
+iface {{ interface_name }} inet static
+	address {{ address_with_cird }}
+	gateway {{ gateway }}
+	dns-nameservers {{ dns }}

roles/template_differ/tests/inventory

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+#SPDX-License-Identifier: MIT-0
+localhost
+

roles/template_differ/tests/test.yml

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+#SPDX-License-Identifier: MIT-0
+---
+- hosts: localhost
+  remote_user: root
+  roles:
+    - template-differ

roles/template_differ/vars/main.yml

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+#SPDX-License-Identifier: MIT-0
+---
+# vars file for template-differ