The beginnings of a backup solution

playbooks/roles/docker_backup/tasks/main.yml

@@ -0,0 +1,54 @@
+---
+- name: Ensure backup rules contains the necessary fields
+  ansible.builtin.fail:
+    msg: "You must define {{ item }} in the backup ruleset"
+  when: not backup_rules[item] is defined
+  loop:
+    - container_name
+    - directories_to_backup
+    - backup_dir
+    - backup_name_prefix
+    - max_backups_kept
+
+- name: Stop the running container
+  community.docker.docker_container:
+    name: "{{ backup_rules.container_name }}"
+    state: stopped
+
+- name: Archive necessary directories
+  community.general.archive:
+    path: "{{ backup_rules.directories_to_backup }}"
+    dest: >-
+      {{ backup_rules.backup_dir }}/{{ backup_rules.backup_name_prefix }}_
+      {{ now().strftime("%Y%m%d%H%M%S") }}.tar.gz
+    format: gz
+  async: 3600
+  poll: 60
+
+- name: Start the stopped container
+  community.docker.docker_container:
+    name: "{{ backup_rules.container_name }}"
+    state: started
+
+- name: Find all files that start with the backup_name_prefix
+  ansible.builtin.find:
+    paths: "{{ backup_rules.backup_dir }}"
+    patterns: "{{ backup_rules.backup_name_prefix }}*"
+  register: all_backup_files
+
+- name: If too many backups kept
+  when: all_backup_files.files | length > backup_rules.max_backups_kept
+  block:
+    - name: Get the oldest file paths
+      ansible.builtin.set_fact:
+        oldest_file_paths: >-
+          {{ (all_backup_files.files | sort(attribute='mtime'))[:all_backup_files.files | length - backup_rules.max_backups_kept] |
+              map(attribute=path) | list }}
+      
+    - name: Remove the files
+      ansible.builtin.file:
+        path: "{{ item }}"
+        state: absent
+      loop: "{{ oldest_file_paths }}"
+
+