From 4835f1b2b2defb0e974bc1ab630b38cb005ef5c5 Mon Sep 17 00:00:00 2001
From: Kuba Orlik <kontakt@kuba-orlik.name>
Date: Fri, 11 Sep 2026 20:16:25 +0200
Subject: [PATCH] Ensure docker ipv6 is enabled

---
 README.md      | 20 ++++++++++++--------
 tasks/main.yml | 23 +++++++++++++++++++++++
 2 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index 3fd6df9..d34499f 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,14 @@
 ```yml
-- role: "mailcow"
-  vars: 
-      mailcow_repo_dir: "/opt/mailcow-dockerized"
-      mailcow_dockerized_commit: "586b3a2ed1c"
-      mailcow_hostname_fqdn: "mail.strona-czynna.pl"
-      mailcow_storage_dir: "/mnt/juice/mailcow"
-      mailcow_local_http_port: "9001"
-      mailcow_timezone: "Europe/Warsaw"
+- name: "Install Mailcow"
+  hosts: ansible1
+  tags: "mailcow"
+  vars:
+    mailcow_repo_dir: "/opt/mailcow-dockerized"
+    mailcow_dockerized_commit: "586b3a2ed1c"
+    mailcow_hostname_fqdn: "mail.kuba-orlik.name"
+    mailcow_storage_dir: "/mnt/juice/mailcow"
+    mailcow_local_http_port: "9001"
+    mailcow_timezone: "Europe/Warsaw"
+  roles:
+    - mailcow
 ```
diff --git a/tasks/main.yml b/tasks/main.yml
index 6d14591..66c1a70 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -53,6 +53,29 @@
     version: "{{ mailcow_dockerized_commit }}"
     update: false
 
+- name: Read Docker daemon configuration
+  ansible.builtin.slurp:
+    src: /etc/docker/daemon.json
+  register: docker_daemon_json
+  failed_when: false
+  changed_when: false
+
+- name: Enable Docker IPv6
+  ansible.builtin.copy:
+    dest: /etc/docker/daemon.json
+    content: >-
+      {{
+        (
+          (docker_daemon_json.content | default('e30=') | b64decode | from_json)
+          | combine({'ipv6': true})
+        )
+        | to_nice_json
+      }}
+    owner: root
+    group: root
+    mode: "0644"
+  notify: Restart Docker
+
 - name: "Generate the config file"
   shell:
     cmd: "MAILCOW_HOSTNAME={{mailcow_hostname_fqdn}} MAILCOW_BRANCH=master MAILCOW_TZ={{mailcow_timezone}} ./generate_config.sh"