A presentation that gives both an overview of Ansible and how this can be applied to MySQL, unfortunately lacking the demos..

1. MANAGING MYSQL
WITH ANSIBLE
Ben Mildren
04/11/14

2. About me – Ben Mildren
• rDBA Technical Lead, Percona
– Percona Managed Services
• Around 15 years RDBMS experience
• Previous roles include:
– Team Technical Lead, Pythian
– Senior Database Administrator, Nokia
Email: ben.mildren@percona.com
LinkedIn: benmildren
Twitter: @productiondba
Slideshare: benmildren
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3. What will we be covering today?
1 What?
What is
Ansible?
2 How?
Usage and
concepts
3 Demo!
Practical
Examples
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4. What problem are we looking to solve?
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Provisioning?
Configuration Management?
Application Deployment?
Orchestration?
Automation?
www.ansible.com/blog/2013/11/29/ansibles-architecture-beyond-configuration-management

5. Software solutions
• Puppet: Apache license, www.puppetlabs.com
– Ruby, Manifests (Puppet language)
• Chef: Apache license, www.getchef.com
– Ruby/Erlang, Cookbooks (Ruby)
• Salt: Apache license, www.saltstack.com
– Python, States (YAML/Jinja2 (default renderer))
• Ansible: GPL v3 license, www.ansible.com
– Python, Playbooks (YAML/Jinja2)
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http://en.wikipedia.org/wiki/Comparison_of_open-source_configuration_management_software

6. Why did we choose Ansible?
• Simple, Readable
• Declaritive, Idempotent
• Uses SSH
• Agentless
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7. Installation Requirements
• Python 2.X
– 2.6+ Control Machine
● Required dependencies including;
PyYAML, Jinja2, pycrypto, paramiko.
– 2.4+ Managed Node
● python-simplejson (if 2.5 or below)
● libselinux-python (if selinux enabled)
(and using copy/file/template functions)
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http://docs.ansible.com/intro_installation.html

8. Installation
• Package Manager
– yum (via epel)
– apt
• pip
• Source (https://github.com/ansible/ansible)
https://github.com/ansible/ansible/blob/devel/CHANGELOG.md
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http://docs.ansible.com/intro_installation.html

9. Configuration
• Config file
ANSIBLE_CONFIG > ./ansible.cfg >
~/.ansible.cfg > /etc/ansible/ansible.cfg
(settings are not merged)
• Inventory file
– /etc/ansible/hosts (default)
– or can use dynamic inventory script
https://github.com/ansible/ansible/tree/devel/plugins/inventory
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10. Inventory File
• INI format
– Hosts / Groups
– Groups of Groups
– Host and Group variables
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11. Inventory File
• Example:
[fra_cluster]
mysql01
mysql02
[deu_cluster]
mysql03
mysql04
[euro_clusters:children]
fra_cluster
deu_cluster
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12. Ad-Hoc Commands
• ansible <host-pattern> [options]
<host-pattern> → inventory file
/etc/ansible/hosts (default)
-i PATH, --inventory=PATH
[options]
typically module (-m) & arguments (-a)
also connectivity, logging, etc
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13. Modules
• ad-hoc default == command module
• ansible-doc
-l, --list
-s, --snippet [module]
[module]
• can develop custom modules
– Potentially any language, JSON output
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http://docs.ansible.com/modules_by_category.html

14. Working with MySQL
• MySQL Specific Modules
– mysql_db
– mysql_user
– mysql_replication
– mysql_variables
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15. Working with MySQL
• Other useful modules
– package manager (yum / apt)
– service
– file
– template
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16. Templates
• jinja2 formatted
– variables, conditionals, loops, etc..
[mysqld]
### General options
user = mysql
pid-file = {{ mysql_run_dir }}/mysqld.pid
socket = {{ mysql_run_dir }}/mysqld.sock
datadir = {{ mysql_data_dir }}
tmpdir = {{ mysql_tmp_dir }}
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http://jinja.pocoo.org/docs/dev/templates/

17. Enter the playbook!
• Written in YAML
• Consists of one or more “plays”
– Target section
– Variable section
– Task section
– Handlers section
• Executed using ansible-playbook
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18. Enter the playbook!
• conditionals
• loops
• async / poll
• tags
• error handling
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19. Facts
• setup
• will also run ohai and/or facter if installed
• can be disabled for performance if not
required
• set_fact module
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20. Running playbooks
• ansible-playbook playbook.yml
– similar connectivity options to ad-hoc ansible
command
– Has additional options specific to running
playbooks, e.g:
--list-hosts, --list-tasks
--syntax-check, --check (-C), --diff (-D)
--step, --start-at-task
--tags (-t), --skip-tags
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21. Role play
• Include files
• Directory Structure
• Dependencies & Defaults
• ansible-galaxy
– init
– install, list, info, remove
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22. Logging
• cowsay or nocows=1
• verbose & verboser
• ansible log
• callback plugins
– Notification (email, campfire, hipchat, etc)
– improved logging (ELK anybody?)
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https://github.com/ansible/ansible/tree/devel/plugins/callbacks

23. Password Management
• lookup passwords
• ansible-vault
– create/edit/encrypt/decrypt/rekey
– aes256 encryption
ansible-playbook --ask-vault-pass
ansible-playbook --vault-password-file
(file or script)
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24. Performance
• Connectivity
– fireball (deprecated)
– accelerated mode
– pipelining
• forking
• ansible-pull?
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25. How can ansible help with MySQL?
• Installation / Upgrades
• Managing configuration (mysql & host)
• User Administration
• Managing cronjobs
• Deployments
• Provisioning new nodes in a cluster
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26. Demo & Questions
• Pray to the demo gods....
• Questions?
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