galera-formula

Saltstack Official Galera Formula

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======
Galera
======

Galera Cluster for MySQL is a true Multimaster Cluster based on synchronous replication. Galera Cluster is an easy-to-use, high-availability solution, which provides high system uptime, no data loss and scalability for future growth.

Sample pillars
==============

Galera cluster master node

.. code-block:: yaml

galera:
master:
enabled: true
name: openstack
bind:
address: 192.168.0.1
port: 3306
members:
- host: 192.168.0.1
port: 4567
- host: 192.168.0.2
port: 4567
admin:
user: root
password: pass
database:
name:
encoding: 'utf8'
users:
- name: 'username'
password: 'password'
host: 'localhost'
rights: 'all privileges'

Galera cluster slave node

.. code-block:: yaml

galera:
slave:
enabled: true
name: openstack
bind:
address: 192.168.0.2
port: 3306
members:
- host: 192.168.0.1
port: 4567
- host: 192.168.0.2
port: 4567
admin:
user: root
password: pass

Additional mysql users:

.. code-block:: yaml

mysql:
server:
users:
- name: clustercheck
password: clustercheck
database: '*.*'
grants: PROCESS
- name: inspector
host: 127.0.0.1
password: password
databases:
mydb:
- database: mydb
- table: mytable
- grant_option: True
- grants:
- all privileges

Additional check params:

.. code-block:: yaml

galera:
clustercheck:
- enabled: True
- user: clustercheck
- password: clustercheck
- available_when_donor: 0
- available_when_readonly: 1
- port 9200

Usage
=====

MySQL Galera check sripts

.. code-block:: bash

mysql> SHOW STATUS LIKE 'wsrep%';

mysql> SHOW STATUS LIKE 'wsrep_cluster_size' ;"

Galera monitoring command, performed from extra server

.. code-block:: bash

garbd -a gcomm://ipaddrofone:4567 -g my_wsrep_cluster -l /tmp/1.out -d

1. salt-call state.sls mysql
2. Comment everything starting wsrep* (wsrep_provider, wsrep_cluster, wsrep_sst)
3. service mysql start
4. run on each node mysql_secure_install and filling root password.

.. code-block:: bash

Enter current password for root (enter for none):
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MySQL
root user without the proper authorisation.

Set root password? [Y/n] y
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..
... Success!

By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL without having to have a user account created for
them. This is intended only for testing, and to make the installation
go a bit smoother. You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y
... Success!

Normally, root should only be allowed to connect from 'localhost'. This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] n
... skipping.

By default, MySQL comes with a database named 'test' that anyone can
access. This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] y
- Dropping test database...
... Success!
- Removing privileges on test database...
... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y
... Success!

Cleaning up...

5. service mysql stop
6. uncomment all wsrep* lines except first server, where leave only in my.cnf wsrep_cluster_address='gcomm://';
7. start first node
8. Start third node which is connected to first one
9. Start second node which is connected to third one
10. After starting cluster, it must be change cluster address at first starting node without restart database and change config my.cnf.

.. code-block:: bash

mysql> SET GLOBAL wsrep_cluster_address='gcomm://10.0.0.2';

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