Issue #6: Add replication configuration.

defaults/main.yml

@@ -40,13 +40,29 @@ mysql_innodb_log_buffer_size: "8M"
 mysql_innodb_flush_log_at_trx_commit: "1"
 mysql_innodb_lock_wait_timeout: 50
 
-# mysqldump settings
+# mysqldump settings.
 mysql_mysqldump_max_allowed_packet: "64M"
 
-# mysqld_safe setting
+# Logging settings.
 mysql_log_error: /var/log/mysqld.log
 mysql_syslog_tag: mysqld
 
-# databases and users settings
+# Databases.
 mysql_databases: []
+# Full example:
+# mysql_databases:
+#   - { name: example, collation: utf8_general_ci, encoding: utf8, replicate: 1 }
+
+# Users
 mysql_users: []
+# Full Example:
+# mysql_users:
+#   - { name: example, host: 127.0.0.1, password: secret, priv: *.*:USAGE }
+
+# Replication settings (replication is only enabled if master/user have values).
+mysql_server_id: "1"
+mysql_max_binlog_size: "100M"
+mysql_replication_role: master
+mysql_replication_master: ''
+# Same keys as `mysql_users` above.
+mysql_replication_user: []

tasks/databases.yml

@@ -0,0 +1,8 @@
+---
+- name: Ensure MySQL databases are present.
+  mysql_db:
+    name: "{{ item.name }}"
+    collation: "{{ item.collation | default('utf8_general_ci') }}"
+    encoding: "{{ item.encoding | default('utf8') }}"
+    state: present
+  with_items: mysql_databases

tasks/main.yml

@@ -10,4 +10,6 @@
 
 - include: configure.yml
 - include: secure-installation.yml
-- include: databases-users.yml
+- include: databases.yml
+- include: users.yml
+- include: replication.yml

tasks/replication.yml

@@ -0,0 +1,51 @@
+---
+- name: Ensure replication user exists on master.
+  mysql_user:
+    name: "{{ mysql_replication_user.name }}"
+    host: "{{ mysql_replication_user.host | default('%') }}"
+    password: "{{ mysql_replication_user.password }}"
+    priv: "{{ mysql_replication_user.priv | default('*.*:REPLICATION SLAVE') }}"
+    state: present
+  when: >
+    (mysql_replication_role == 'master')
+    and mysql_replication_user
+    and (mysql_replication_master != '')
+
+- name: Check slave replication status.
+  mysql_replication: mode=getslave
+  ignore_errors: true
+  register: slave
+  when: >
+    mysql_replication_role == 'slave'
+    and (mysql_replication_master != '')
+
+- name: Check master replication status.
+  mysql_replication: mode=getmaster
+  delegate_to: "{{ mysql_replication_master }}"
+  register: master
+  when: >
+    slave|failed
+    and (mysql_replication_role == 'slave')
+    and (mysql_replication_master != '')
+
+- name: Configure replication on the slave.
+  mysql_replication:
+    mode: changemaster
+    master_host: "{{ mysql_replication_master }}"
+    master_user: "{{ mysql_replication_user.name }}"
+    master_password: "{{ mysql_replication_user.password }}"
+    master_log_file: "{{ master.File }}"
+    master_log_pos: "{{ master.Position }}"
+  ignore_errors: True
+  when: >
+    slave|failed
+    and (mysql_replication_role == 'slave')
+    and (mysql_replication_master != '')
+    and mysql_replication_user
+
+- name: Start replication.
+  mysql_replication: mode=startslave
+  when: >
+    slave|failed
+    and (mysql_replication_role == 'slave')
+    and (mysql_replication_master != '')

tasks/users.yml

@@ -1,12 +1,4 @@
 ---
-- name: Ensure MySQL databases are present.
-  mysql_db:
-    name: "{{ item.name }}"
-    collation: "{{ item.collation | default('utf8_general_ci') }}"
-    encoding: "{{ item.encoding | default('utf8') }}"
-    state: present
-  with_items: mysql_databases
-
 - name: Ensure MySQL users are present.
   mysql_user:
     name: "{{ item.name }}"

templates/my.cnf.j2

@@ -8,13 +8,34 @@ port = {{ mysql_port }}
 datadir = {{ mysql_datadir }}
 socket = {{ mysql_socket }}
 
+# Replication
+server-id = {{ mysql_server_id }}
+
+{% if mysql_replication_role == 'master' %}
+log_bin = mysql-bin
+log-bin-index = mysql-bin.index
+expire_logs_days = 10
+max_binlog_size = {{ mysql_max_binlog_size }}
+
+{% for db in mysql_databases %}
+{% if db.replicate|default(1) %}
+binlog_do_db = {{ db.name }}
+{% else %}
+binlog_ignore_db = {{ db.name }}
+{% endif %}
+{% endfor %}
+{% endif %}
+
+{% if mysql_replication_role == 'slave' %}
+read_only
+relay-log = relay-bin
+relay-log-index = relay-bin.index
+{% endif %}
+
 # Disabling symbolic-links is recommended to prevent assorted security risks
 symbolic-links = 0
 
-# Settings user and group are ignored when systemd is used (fedora >= 15).
-# If you need to run mysqld under a different user or group,
-# customize your systemd unit file for mysqld according to the
-# instructions in http://fedoraproject.org/wiki/Systemd
+# User is ignored when systemd is used (fedora <= 15).
 user = mysql
 
 # http://dev.mysql.com/doc/refman/5.5/en/performance-schema.html