Use official Portainer updater

roles/update_portainer/defaults/main.yml

@@ -1,5 +1,5 @@
 ---
-# Watchtower is used only as a one-shot updater. It recreates the selected
-# Portainer containers with their existing configuration and then removes itself.
-portainer_watchtower_image: containrrr/watchtower:latest
+# Portainer's official updater recreates the server container while preserving
+# its existing Docker configuration and persistent data.
+portainer_updater_image: portainer/portainer-updater:latest
 portainer_target_tag: latest

roles/update_portainer/tasks/main.yml

@@ -8,7 +8,7 @@
   changed_when: false
   failed_when: false
 
-- name: Find Docker containers
+- name: Find and update Portainer
   when: portainer_docker_info.rc == 0
   block:
     - name: List all container IDs
@@ -22,83 +22,50 @@
       register: portainer_all_containers
       changed_when: false
 
-    - name: Inspect container images
-      ansible.builtin.command:
-        argv:
-          - docker
-          - container
-          - inspect
-          - --format
-          - "{% raw %}{{.Config.Image}}{% endraw %}"
-          - "{{ item }}"
-      loop: "{{ portainer_all_containers.stdout_lines }}"
-      register: portainer_container_inspections
-      changed_when: false
-
-    - name: Select Portainer CE and Business Edition server containers
-      ansible.builtin.set_fact:
-        portainer_container_ids: >-
-          {{ portainer_container_inspections.results
-             | selectattr('stdout', 'match',
-                 '^(?:[^/]+/)?portainer/(?:portainer|portainer-(?:ce|ee))(?::|@|$)')
-             | map(attribute='item')
-             | list }}
-
-    - name: Pull the latest release for each installed Portainer edition
-      ansible.builtin.command:
-        argv:
-          - docker
-          - image
-          - pull
-          - >-
-            {{ 'portainer/portainer-ee:' ~ portainer_target_tag
-               if 'portainer-ee' in item.stdout
-               else 'portainer/portainer-ce:' ~ portainer_target_tag }}
-      loop: "{{ portainer_container_inspections.results }}"
-      loop_control:
-        label: "{{ item.stdout }}"
-      register: portainer_image_pulls
-      changed_when: "'Downloaded newer image' in portainer_image_pulls.stdout"
-      when:
-        - item.stdout is match('^(?:[^/]+/)?portainer/(?:portainer|portainer-(?:ce|ee))(?::|@|$)')
-        - not ansible_check_mode
-
-    - name: Point the existing image reference at the latest release
-      ansible.builtin.command:
-        argv:
-          - docker
-          - image
-          - tag
-          - >-
-            {{ 'portainer/portainer-ee:' ~ portainer_target_tag
-               if 'portainer-ee' in item.stdout
-               else 'portainer/portainer-ce:' ~ portainer_target_tag }}
-          - "{{ item.stdout }}"
-      loop: "{{ portainer_container_inspections.results }}"
-      loop_control:
-        label: "{{ item.stdout }}"
-      changed_when: false
-      when:
-        - item.stdout is match('^(?:[^/]+/)?portainer/(?:portainer|portainer-(?:ce|ee))(?::|$)')
-        - not ansible_check_mode
-
-    - name: Update discovered Portainer containers
+    - name: Inspect all container images
       ansible.builtin.command:
         argv: >-
-          {{ ['docker', 'run', '--rm', '--pull', 'always',
-              '--volume', '/var/run/docker.sock:/var/run/docker.sock',
-              portainer_watchtower_image, '--run-once', '--cleanup', '--no-pull',
-              '--include-stopped']
-             + portainer_container_ids }}
-      register: portainer_watchtower
-      changed_when: >-
-        (portainer_watchtower.stdout ~ portainer_watchtower.stderr)
-        is regex('Updated=[1-9][0-9]*')
+          {{ ['docker', 'container', 'inspect']
+             + portainer_all_containers.stdout_lines }}
+      register: portainer_container_inspection
+      changed_when: false
+      when: portainer_all_containers.stdout_lines | length > 0
+
+    - name: Select installed Portainer editions
+      ansible.builtin.set_fact:
+        portainer_installed_images: >-
+          {{ (portainer_container_inspection.stdout | default('[]') | from_json)
+             | map(attribute='Config.Image')
+             | select('match',
+                 '^(?:[^/]+/)?portainer/(?:portainer|portainer-(?:ce|ee))(?::|@|$)')
+             | unique
+             | list }}
+
+    - name: Update Portainer to the newest release
+      ansible.builtin.command:
+        argv:
+          - docker
+          - run
+          - --rm
+          - --pull
+          - always
+          - --volume
+          - /var/run/docker.sock:/var/run/docker.sock
+          - "{{ portainer_updater_image }}"
+          - >-
+            --image={{ 'portainer/portainer-ee:' ~ portainer_target_tag
+                       if 'portainer-ee' in item
+                       else 'portainer/portainer-ce:' ~ portainer_target_tag }}
+      loop: "{{ portainer_installed_images }}"
+      loop_control:
+        label: "{{ item }}"
+      register: portainer_update
+      changed_when: true
       when:
-        - portainer_container_ids | length > 0
+        - portainer_installed_images | length > 0
         - not ansible_check_mode
 
     - name: Report when no Portainer server is installed
       ansible.builtin.debug:
         msg: No Portainer CE or Business Edition server container found; skipping.
-      when: portainer_container_ids | length == 0
+      when: portainer_installed_images | length == 0