🚀 Manage Galera

.github/workflows/molecule.yml

@@ -14,6 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         scenario:
+          - debian12_galera
           - debian12_master_slave
           - debian12_upstream
 

defaults/main.yml

@@ -121,7 +121,7 @@ mariadb_upstream_version: '11.4'
 # Galera
 # -------------------------------------
 mariadb_galera_resetup: false
-mariadb_wsrep_node_address: false    # Set primary node IP
+mariadb_wsrep_node_address: '{{ ansible_default_ipv4.address if ansible_default_ipv4 is defined else "127.0.0.1" }}'
 mariadb_galera_members: []
 mariadb_galera_primary_node: 'change_me'    # See: https://github.com/ansible/ansible/issues/17453
 mariadb_wsrep_sst_method: 'rsync'

handlers/main.yml

@@ -5,3 +5,4 @@
     name: "{{ mariadb_service_name }}"
     state: restarted
   when: mariadb_notify_restart
+  throttle: 1

molecule/_shared/inventory/group_vars/galera.yml

@@ -2,3 +2,4 @@
 
 mariadb_use_galera: true
 mariadb_galera_members: "{{ groups['galera'] }}"
+mariadb_galera_primary_node: "{{ mariadb_galera_members | first }}"

molecule/debian12_galera/converge.yml

@@ -0,0 +1,9 @@
+---
+
+- name: Converge
+  hosts: all
+  gather_facts: true
+  tasks:
+    - name: Include role
+      ansible.builtin.include_role:
+        name: "hanxhx.mysql"

molecule/debian12_galera/molecule.yml

@@ -0,0 +1,55 @@
+---
+
+platforms:
+  - name: debian12-galera1
+    image: dokken/debian-12
+    command: /lib/systemd/systemd
+    dockerfile: ../_shared/Dockerfile.j2
+    capabilities:
+      - SYS_ADMIN
+    cgroupns_mode: host
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:rw
+    privileged: true
+    groups:
+      - galera
+    networks:
+      - name: "00-molecule-d12-galera"
+        ipv4_address: '172.16.51.1'
+    docker_networks:
+      - name: "00-molecule-d12-galera"
+        ipam_config:
+          - subnet: "172.16.51.0/24"
+            gateway: "172.16.51.254"
+
+  - name: debian12-galera2
+    image: dokken/debian-12
+    command: /lib/systemd/systemd
+    dockerfile: ../_shared/Dockerfile.j2
+    capabilities:
+      - SYS_ADMIN
+    cgroupns_mode: host
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:rw
+    privileged: true
+    groups:
+      - galera
+    networks:
+      - name: "00-molecule-d12-galera"
+        ipv4_address: '172.16.51.2'
+
+  - name: debian12-galera3
+    image: dokken/debian-12
+    command: /lib/systemd/systemd
+    dockerfile: ../_shared/Dockerfile.j2
+    capabilities:
+      - SYS_ADMIN
+    cgroupns_mode: host
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:rw
+    privileged: true
+    groups:
+      - galera
+    networks:
+      - name: "00-molecule-d12-galera"
+        ipv4_address: '172.16.51.3'

molecule/debian12_galera/verify.yml

@@ -0,0 +1,31 @@
+---
+
+- name: Verify Galera
+  hosts: galera
+  gather_facts: false
+  tasks:
+    - name: MYSQL_QUERY | Check if Galera is running
+      community.mysql.mysql_query:
+        query: "SHOW GLOBAL STATUS LIKE 'wsrep_ready'"
+        login_unix_socket: /run/mysqld/mysqld.sock
+      register: wsrep_ready
+
+    - name: ASSERT | Fail if Galera is not running
+      ansible.builtin.assert:
+        that:
+          - wsrep_ready.query_result.0.0.Value == "ON"
+        fail_msg: "Galera is not running"
+        success_msg: "Galera is running"
+
+    - name: MYSQL_QUERY | Check Galera status
+      community.mysql.mysql_query:
+        query: "SHOW GLOBAL STATUS LIKE 'wsrep_local_state_comment'"
+        login_unix_socket: /run/mysqld/mysqld.sock
+      register: wsrep_local_state_comment
+
+    - name: ASSERT | Fail if Galera is not on the right state
+      ansible.builtin.assert:
+        that:
+          - wsrep_local_state_comment.query_result.0.0.Value == "Synced"
+        fail_msg: "Galera is not expected state ({{ wsrep_local_state_comment.query_result.0.0.Value }})"
+        success_msg: "Galera is in expected state"

tasks/galera/bootstrap.yml

@@ -1,4 +1,5 @@
 ---
+
 - name: SET_FACT | Prepare mark var
   ansible.builtin.set_fact:
     __mark: "{{ mariadb_datadir }}/.ansible_galera_boostrap"

tasks/galera/main.yml

@@ -2,31 +2,20 @@
 
 - name: APT | Install Galera
   ansible.builtin.apt:
-    pkg: "{{ mariadb_galera_package_name }}"
+    name: "{{ mariadb_galera_package_name }}"
 
 - name: TEMPLATE | Deploy Galera configuration
   ansible.builtin.template:
-    src: etc/mysql/mariadb.conf.d/20-galera.cnf.j2
-    dest: /etc/mysql/mariadb.conf.d/20-galera.cnf
+    src: etc/mysql/mariadb.conf.d/60-galera.cnf.j2
+    dest: /etc/mysql/mariadb.conf.d/60-galera.cnf
     mode: 0644
     owner: root
     group: root
-  register: galeraconfig
+  notify: Restart mariadb
 
 - name: INCLUDE | Bootstrap first node
   ansible.builtin.import_tasks: 'bootstrap.yml'
   when: inventory_hostname == mariadb_galera_primary_node
 
-- name: INCLUDE | Configure other nodes
-  ansible.builtin.import_tasks: 'nodes.yml'
-  when: inventory_hostname != mariadb_galera_primary_node
-
-- name: SERVICE | Restart MariaDB if needed
-  ansible.builtin.service:
-    name: "{{ mariadb_service_name }}"
-    state: restarted
-  when:
-    ((galeraconfig or (p is defined and p.changed)) and
-    (bootstrap_run is not defined)) or
-    ((inventory_hostname != mariadb_galera_primary_node) and
-    (mariadb_galera_resetup))
+- name: META | Flush handlers
+  ansible.builtin.meta: flush_handlers

tasks/galera/nodes.yml

@@ -1,35 +0,0 @@
----
-
-- name: COMMAND | GET debian.cnf from primary node
-  ansible.builtin.command: cat /etc/mysql/debian.cnf
-  register: debiancnf
-  delegate_to: '{{ mariadb_galera_primary_node }}'
-  changed_when: false
-
-- name: COMMAND | Get current debian.cnf
-  ansible.builtin.command: cat /etc/mysql/debian.cnf
-  register: ondc
-  changed_when: false
-
-- name: BLOCK | Compare debian.cnf
-  when: debiancnf.stdout != ondc.stdout
-  block:
-
-    - name: SERVICE | Stop MariaDB
-      ansible.builtin.service:
-        name: "{{ mariadb_service_name }}"
-        state: stopped
-
-    - name: COPY | Paste primary node's debian.cnf
-      ansible.builtin.copy:
-        content: "{{ debiancnf.stdout }}"
-        dest: /etc/mysql/debian.cnf
-        mode: 0600
-        owner: root
-        group: root
-      register: paste
-
-    - name: SERVICE | Start MariaDB
-      ansible.builtin.service:
-        name: "{{ mariadb_service_name }}"
-        state: started

tasks/main.yml

@@ -36,6 +36,7 @@
     - etc/mysql/conf.d/mysqldump.cnf.j2
     - etc/mysql/mariadb.conf.d/10-extra.cnf.j2
     - etc/mysql/mariadb.conf.d/50-server.cnf.j2
+  notify: Restart mariadb
 
 - name: FILE | Ensure log dir exists
   ansible.builtin.file:
@@ -45,14 +46,8 @@
     owner: mysql
     group: mysql
 
-- name: SERVICE | Restart Mariadb now one at a time (prevent bugs)
-  throttle: 1
-  ansible.builtin.service:
-    name: "{{ mariadb_service_name }}"
-    state: restarted
-  when:
-    config.changed and
-    not mariadb_galera_resetup
+- name: META | Flush handlers
+  ansible.builtin.meta: flush_handlers
 
 - name: SERVICE | Ensure service is started
   ansible.builtin.service:

templates/etc/mysql/mariadb.conf.d/60-galera.cnf.j2

@@ -12,6 +12,7 @@
 
 # Global
 wsrep_on              = ON
+wsrep_provider        = /usr/lib/galera/libgalera_smm.so
 wsrep_cluster_address = gcomm://{{ mariadb_galera_members | join(",") }}
 wsrep_sst_method      = "{{ mariadb_wsrep_sst_method }}"
 {% if mariadb_wsrep_cluster_name is defined %}
@@ -19,7 +20,7 @@ wsrep_cluster_name    = "{{ mariadb_wsrep_cluster_name }}"
 {% endif %}
 
 # Node Configuration
-wsrep_node_address    = "{{ mariadb_wsrep_node_address | default(ansible_default_ipv4.address if ansible_default_ipv4 is defined else '127.0.0.1') }}"
+wsrep_node_address    = "{{ mariadb_wsrep_node_address }}"
 wsrep_node_name       = "{{ mariadb_wsrep_node_name | default(ansible_fqdn) }}"
 
 # Deps