Add mysql-replication role

.gitignore

@@ -40,3 +40,5 @@ vault_pass
 
 # ---> vagrant
 .vagrant
+
+*.swp

ansible/playbook.yaml

@@ -21,8 +21,14 @@
         - 192.168.56.2
         - 192.168.56.3
         - 192.168.56.4
+    mysql:
+      replication_user: replica_user
+      replication_master: web1
+      replication_slaves:
+        - web2
+        - web3
   pre_tasks:
-    - debug: var=ansible_all_ipv4_addresses[1]
+    - debug: var=ansible_all_ipv4_addresses
     # we need gluster on all servers to configure peering
     - name: Install gluster
       ansible.builtin.apt:
@@ -41,6 +47,7 @@
   roles:
     - nginx
     - mysql
+    - mysql-replication
     - php
     - glusterfs
     - wordpress

ansible/roles/mysql-replication/tasks/main.yaml

@@ -0,0 +1,67 @@
+---
+- name: Write config
+  ansible.builtin.template:
+    src: "mysql.cnf.j2"
+    dest: "/etc/mysql/mariadb.conf.d/50-server.cnf"
+    mode: "0644"
+  become: true
+
+- name: restart mysql
+  ansible.builtin.service:
+    name: mysql
+    state: restarted
+    enabled: true
+  become: true
+
+- name: Create replication user
+  community.mysql.mysql_user:
+    state: present
+    login_user: root
+    login_password: "{{ mysql_root_password }}"
+    name: "{{ mysql.replication_user }}"
+    password: "{{ mysql_replication_pass }}"
+    host: "%"
+    tls_requires:
+    priv:
+      "*.*": "REPLICATION SLAVE"
+    login_unix_socket: /var/run/mysqld/mysqld.sock
+  become: true
+  when: mysql.replication_master in ansible_all_ipv4_addresses
+
+- name: Get master replication status
+  community.mysql.mysql_replication:
+    login_user: root
+    login_password: "{{ mysql_root_password }}"
+    mode: getmaster
+  register: repl_stat
+  when: ansible_hostname == mysql.replication_master
+
+- debug: var=repl_stat
+
+- name: Check if slave is already configured as replica
+  community.mysql.mysql_replication:
+    login_user: root
+    login_password: "{{ mysql_root_password }}"
+    mode: getslave
+  ignore_errors: true
+  register: slave
+  when: ansible_hostname in mysql.replication_slaves
+
+- name: Setup slaves
+  community.mysql.mysql_replication:
+    login_user: root
+    login_password: "{{ mysql_root_password }}"
+    mode: changemaster
+    master_host: "{{ mysql.replication_master }}"
+    master_log_file: "{{ hostvars['web1'].repl_stat.File }}"
+    master_log_pos: "{{ hostvars['web1'].repl_stat.Position }}"
+    master_user: "{{ mysql.replication_user }}"
+    master_password: "{{ mysql_replication_pass }}"
+  when: ansible_hostname in mysql.replication_slaves and not slave.Is_Slave
+
+- name: Start slave replication
+  community.mysql.mysql_replication:
+    login_user: root
+    login_password: "{{ mysql_root_password }}"
+    mode: startslave
+  when: ansible_hostname in mysql.replication_slaves and not slave.Is_Slave

ansible/roles/mysql-replication/templates/mysql.cnf.j2

@@ -0,0 +1,15 @@
+[mysqld]
+bind-address = "0.0.0.0"
+{% if ansible_hostname == mysql.replication_master %}
+server-id = 1
+expire_logs_days = 10
+max_binlog_size = 100M
+log-bin = /var/log/mysql/mysql-bin.log
+binlog_do_db = {{ wordpress.db_name }}
+{% endif %}
+{% for item in mysql.replication_slaves %}
+{% if ansible_hostname == item %}
+server-id = {{ loop.index0 + 2}}
+relay-log = /var/log/mysql/mysql-relay-bin.log
+{% endif %}
+{% endfor %}

ansible/roles/mysql/tasks/main.yaml

@@ -36,7 +36,6 @@
     dest: "/root/.my.cnf"
     mode: "0400"
   become: true
-  notify: restart mysql
 
 - name: Setup database for wordpress
   community.mysql.mysql_db:

ansible/vault.yaml

@@ -1,45 +1,47 @@
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