percona xtradb configuration role

Signed-off-by: ahmadali shafiee <mail@ahmadalli.net>

roles/percona/xtradb/configure/defaults/main.yaml

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+percona_xtradb_cluster_version: "8.0"
+
+percona_xtradb_cluster_name: pxc-cluster
+# name of the inventory group containing the pxc nodes
+percona_xtradb_cluster_inventory_group_name:
+

roles/percona/xtradb/configure/tasks/copy-key.yaml

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+---
+- name: get key
+  slurp:
+    src: /var/lib/mysql/{{ _key | mandatory }}
+  register: _key_slurp
+  when: inventory_hostname == groups[percona_xtradb_cluster_inventory_group_name][0]
+- name: write key
+  copy:
+    dest: /var/lib/mysql/{{ _key | mandatory }}
+    content: "{{ _key_slurp['content'] | b64decode }}"
+  delegate_to: "{{ item }}"
+  delegate_facts: true
+  loop: "{{ groups[percona_xtradb_cluster_inventory_group_name][1:] }}"
+  when: inventory_hostname == groups[percona_xtradb_cluster_inventory_group_name][0]

roles/percona/xtradb/configure/tasks/main.yaml

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+---
+- name: set comman facts
+  ansible.builtin.include_vars: common.yaml
+- name: copy keys
+  include: copy-key.yaml
+  loop:
+    - ca-key.pem
+    - ca.pem
+    - server-key.pem
+    - server-cert.pem
+  loop_control:
+    loop_var: _key
+- name: write mysqld configuration files
+  template:
+    src: mysqld-{{ percona_xtradb_cluster_version }}.conf.j2
+    dest: /etc/mysql/mysql.conf.d/mysqld.cnf
+    owner: root
+    group: root
+    mode: "0644"
+- name: write wsrep configuration files
+  template:
+    src: wsrep-{{ percona_xtradb_cluster_version }}.conf.j2
+    dest: /etc/mysql/mysql.conf.d/wsrep.cnf
+    owner: root
+    group: root
+    mode: "0644"

roles/percona/xtradb/configure/templates/mysqld-8.0.conf.j2

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+# Template my.cnf for PXC
+# Edit to your requirements.
+[client]
+socket=/var/run/mysqld/mysqld.sock
+
+[mysqld]
+server-id={{ percona_xtradb_cluster_server_id }}
+datadir=/var/lib/mysql
+socket=/var/run/mysqld/mysqld.sock
+log-error=/var/log/mysql/error.log
+pid-file=/var/run/mysqld/mysqld.pid
+
+# Binary log expiration period is 604800 seconds, which equals 7 days
+binlog_expire_logs_seconds=604800

roles/percona/xtradb/configure/templates/wsrep-8.0.conf.j2

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+[mysqld]
+# Path to Galera library
+wsrep_provider=/usr/lib/galera4/libgalera_smm.so
+
+# Cluster name
+wsrep_cluster_name={{ percona_xtradb_cluster_name }}
+
+# Cluster connection URL contains IPs of nodes
+#If no IP is found, this implies that a new cluster needs to be created,
+#in order to do that you need to bootstrap this node
+wsrep_cluster_address=gcomm://{{ percona_xtradb_cluster_host_ips | join(',') }}
+
+# In order for Galera to work correctly binlog format should be ROW
+binlog_format=ROW
+
+# Slave thread to use
+wsrep_slave_threads=8
+
+wsrep_log_conflicts
+
+# This changes how InnoDB autoincrement locks are managed and is a requirement for Galera
+innodb_autoinc_lock_mode=2
+
+#If wsrep_node_name is not specified,  then system hostname will be used
+wsrep_node_name={{ inventory_hostname }}
+
+# Node IP address
+wsrep_node_address={{ ip | default(ansible_host, true) }}
+
+#pxc_strict_mode allowed values: DISABLED,PERMISSIVE,ENFORCING,MASTER
+pxc_strict_mode=ENFORCING
+
+# SST method
+wsrep_sst_method=xtrabackup-v2
+
+wsrep_provider_options=”socket.ssl_key=server-key.pem;socket.ssl_cert=server-cert.pem;socket.ssl_ca=ca.pem”
+
+[sst]
+encrypt=4
+ssl-key=server-key.pem
+ssl-ca=ca.pem
+ssl-cert=server-cert.pem

roles/percona/xtradb/configure/vars/common.yaml

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+percona_xtradb_cluster_host_ips: >
+  [
+    {% for host in query('inventory_hostnames', percona_xtradb_cluster_inventory_group_name) %}
+    "{{ hostvars[host]['ip'] | default(hostvars[host]['ansible_host'], true) }}"
+    {% if not loop.last %},{% endif %}
+    {% endfor %}
+  ]
+
+percona_xtradb_cluster_server_id: "{{ groups[percona_xtradb_cluster_inventory_group_name].index(inventory_hostname) + 1 }}"