Full buster optim (#38)

* Remove Stretch and Percona support
* Delete root password management (On Buster, it uses socket auth)
* Fix sync backups files master -> slave
* Cleanup legacy code on replication slave
* Use modern configuration
* Debian buster configuration style
* Drop logrotate management (useless)
* Add new default values in defaults/main.yml (according with MariaDB doc)
* Travis with Ansible 2.8+
* Drop feature "don't replicate mysql database"
* Fully compatible with python3

tasks/replication/slave/debiancnf.yml

@@ -1,25 +0,0 @@
----
-
-- name: FETCH | Get /etc/mysql/debian.cnf on master
-  fetch:
-    src: /etc/mysql/debian.cnf
-    dest: /tmp/{{ mariadb_slave_import_from }}/debian.cnf
-    flat: yes
-  changed_when: false
-  delegate_to: "{{ mariadb_slave_import_from }}"
-
-- name: LOCAL_ACTION FILE | Secure fetched file
-  local_action:
-    module: file
-    path: "/tmp/{{ mariadb_slave_import_from }}/debian.cnf"
-    mode: 0600
-  become: no
-
-- name: COPY | Fetched file to /etc/mysql/debian.cnf
-  copy:
-    src: "/tmp/{{ mariadb_slave_import_from }}/debian.cnf"
-    dest: /etc/mysql/debian.cnf
-    owner: root
-    group: root
-    mode: 0600
-  notify: restart mariadb

tasks/replication/slave/gtid.yml

@@ -1,15 +1,25 @@
 ---
 
-# Need this hack before:
-# - https://github.com/ansible/ansible/issues/29214
-# - https://mariadb.com/kb/en/mariadb/global-transaction-id/#switching-an-existing-old-style-slave-to-use-gtid
-
 - name: MYSQL_REPLICATION | Stop slave
   mysql_replication:
     mode: stopslave
 
-- name: COMMAND | Migrate to MariaDB GTID
+- name: MYSQL_REPLICATION | Configure master host
+  mysql_replication:
+    mode: changemaster
+    master_host: "{{ mariadb_replication_host }}"
+    master_port: "{{ mariadb_replication_port }}"
+    master_user: "{{ mariadb_replication_user }}"
+    master_password: "{{ mariadb_replication_password }}"
+
+# -- Wait this PR in Ansible released version (https://github.com/ansible/ansible/pull/62648)
+# name: MYSQL_REPLICATION | Setup replication with GTID
+# mysql_replication:
+#   master_use_gtid: current_pos
+
+- name: COMMAND | Configure GTID
   command: mariadb -e "CHANGE MASTER TO master_use_gtid=current_pos";
+  changed_when: true
 
 - name: MYSQL_REPLICATION | Start slave
   mysql_replication:

tasks/replication/slave/import_data.yml

@@ -1,39 +1,51 @@
 ---
 
-# Doc: https://www.percona.com/doc/percona-xtrabackup/2.1/howtos/recipes_ibkx_gtid.html
-- name: WAIT_FOR | source data (prevent rsync bug) - TODO find another hack
-  wait_for:
-    host: "{{ mariadb_slave_import_from }}"
-    port: 22
-
-- name: COMMAND | Prepare backup another server
-  command: innobackupex --no-timestamp {{ mariadb_backup_dir }}
-  args:
-    creates: "{{ mariadb_backup_dir }}"
-  delegate_to: "{{ mariadb_slave_import_from }}"
-  register: backup
-
-- name: SHELL | Dump
-  shell: "innobackupex --apply-log {{ mariadb_backup_dir }}"
-  delegate_to: "{{ mariadb_slave_import_from }}"
-  when: backup.changed
-
-- name: FILE | Remove mysql db from backup
+- name: FILE | Create SSH client dir
   file:
-    path: "{{ mariadb_backup_dir }}/mysql"
-    state: absent
+    path: "{{ ansible_env.HOME }}/.ssh"
+    state: directory
+    mode: 0700
+
+- name: OPENSSH_KEYPAIR | Create SSH key
+  openssh_keypair:
+    path: "{{ ansible_env.HOME }}/.ssh/id_rsa"
+  register: gen_ssh
+
+- block:
+
+  - name: AUTHORIZED_KEY | Auth slave to backup host
+    authorized_key:
+      user: "{{ mariadb_backup_user }}"
+      state: present
+      key: "{{ gen_ssh.public_key }}"
+
+  - name: FILE | Create backup directory
+    file:
+      path: "{{ mariadb_backup_dir }}"
+      state: directory
+
+  - name: COMMAND | Prepare backup another server
+    command: "mariabackup --backup -u root --target-dir={{ mariadb_backup_dir }}"
+    args:
+      creates: "{{ mariadb_backup_dir }}/xtrabackup_info"
+    register: backup
+
+  - name: SHELL | Dump
+    shell: "mariabackup --prepare --target-dir={{ mariadb_backup_dir }}"
+    when: backup.changed
+    register: prep
+    changed_when: "'This target seems to be not prepared yet' in prep.stderr"
+
   delegate_to: "{{ mariadb_slave_import_from }}"
-  when: backup.changed and not mariadb_slave_replicate_mysqldb
 
 - name: MYSQL_VARIABLES | Get datadir
   mysql_variables:
     variable: datadir
   register: datadir
 
-- name: SET_FACT | related to mysql datadir
+- name: SET_FACT | Get MariaDB datadir
   set_fact:
     mariadb_datadir: "{{ datadir.msg }}"
-    mariadb_binlog_info: "{{ datadir.msg }}/xtrabackup_binlog_info"
 
 - name: SERVICE | Stop MariaDB before importing data
   service:
@@ -53,29 +65,17 @@
     group: mysql
     recurse: yes
 
+- name: SHELL | Remove InnoDB redo logs
+  shell: "rm -f {{ mariadb_datadir }}/ib_logfile*"
+  args:
+    removes: "{{ mariadb_datadir }}/ib_logfile0"
+    warn: false
+
 - name: SERVICE | Start MariaDB
   service:
     name: mysql
     state: started
 
-- name: SHELL | Get master_log_file
-  command: "awk '{ print $1 }' {{ mariadb_binlog_info }}"
-  register: master_log_file
-
-- name: SHELL | Get master_log_pos
-  command: "awk '{ print $2 }' {{ mariadb_binlog_info }}"
-  register: master_log_pos
-
-- name: SHELL | Get master GTID
-  command: "awk '{ print $3 }' {{ mariadb_binlog_info }}"
-  register: master_gtid
-
-- name: SET_FACT | master_log_file
-  set_fact:
-    mariadb_master_log_file: "{{ master_log_file.stdout }}"
-    mariadb_master_log_pos: "{{ master_log_pos.stdout }}"
-    mariadb_master_gtid: "{{ master_gtid.stdout }}"
-
 - name: FILE | Delete dump
   file:
     path: "{{ mariadb_backup_dir }}"

tasks/replication/slave/ssh.yml

@@ -1,19 +0,0 @@
----
-
-- name: SHELL | Create SSH key if needed on slave
-  shell: "ssh-keygen -b 2048 -t rsa -f {{ ansible_env.HOME }}/.ssh/id_rsa -q -N ''"
-  args:
-    creates: "{{ ansible_env.HOME }}/.ssh/id_rsa"
-
-- name: COMMAND | Get pub key
-  command: cat {{ ansible_env.HOME }}/.ssh/id_rsa.pub
-  register: pub_key
-  changed_when: false
-
-- name: AUTHORIZED_KEY | Auth slave to backup host
-  authorized_key:
-    user: "{{ mariadb_backup_user }}"
-    state: present
-    key: "{{ pub_key.stdout }}"
-  delegate_to: "{{ mariadb_slave_import_from }}"
-  become: yes