Managing WordPress with Ansible

Talk given at WordCamp Manchester, October 2015

Transcript

1. Managing WordPress with Ansible David Murphy, October 2015
2. @schwuk http://schwuk.com David Murphy, October 2015
3. David Murphy, October 2015
4. opinionated David Murphy, October 2015
5. more than one way to do it David Murphy, October 2015
6. why bother with any of this? David Murphy, October 2015
7. doing it yourself David Murphy, October 2015
8. knowing how to do it yourself David Murphy, October 2015
9. automation David Murphy, October 2015
10. if you are going to do something more than once, automate it David Murphy, October 2015
11. Choices David Murphy, October 2015
12. Choice #1: Software David Murphy, October 2015
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14. Choice #2: Platform David Murphy, October 2015
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16. they are all good David Murphy, October 2015
17. Choice #3: Hosting David Murphy, October 2015
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20. they are not all good David Murphy, October 2015
21. Choice #4: Tool David Murphy, October 2015
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23. again, they are all good David Murphy, October 2015
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25. Ansible is a powerful automation tool that you can learn quickly. David Murphy, October 2015
26. how does it work? David Murphy, October 2015
27. inventory playbooks roles David Murphy, October 2015
28. inventory playbooks roles David Murphy, October 2015
29. Inventory David Murphy, October 2015
30. Sample inventory [webservers] www1.example.com www2.example.com [dbservers] db0.example.com db1.example.com David Murphy, October 2015
31. Naming patterns [webservers] www[01:50].example.com [databases] db-[a:f].example.com David Murphy, October 2015
32. Groups-of-groups [web] host1 host2 [database] host2 host3 [site:children] web database David Murphy, October 2015
33. Out-of-scope Dynamic inventory (e.g., Amazon EC2) David Murphy, October 2015
34. Our inventory [development] my_vagrant_host ansible_sudo=yes [production] wcmcr.schwuk.com David Murphy, October 2015
35. demo David Murphy, October 2015
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37. Playbooks David Murphy, October 2015
38. Sample playbook --- - hosts: webservers remote_user: root tasks: - name: ensure apache is at the latest version yum: pkg=httpd state=latest - name: write the apache config file template: src=/srv/httpd.j2 dest=/etc/httpd.conf - hosts: databases remote_user: root tasks: - name: ensure postgresql is at the latest version yum: name=postgresql state=latest - name: ensure that postgresql is started service: name=postgresql state=running David Murphy, October 2015
39. Modules David Murphy, October 2015
40. yum Manages packages with the yum package manager1 - yum: pkg=httpd state=latest 1 http://docs.ansible.com/ansible/yum_module.html David Murphy, October 2015
41. template Create/modify files using variables2 - template: src=/srv/httpd.j2 dest=/etc/httpd.conf 2 http://docs.ansible.com/ansible/template_module.html David Murphy, October 2015
42. service Controls services on the remote host(s)3 - service: name=postgresql state=running 3 http://docs.ansible.com/ansible/service_module.html David Murphy, October 2015
43. Modules, modules, modules → command, get_url → apt, apt_key, apt_repository → digital_ocean, linode, ec2, gce, docker → irc, slack, hipchat, mail → mysql_db, mysql_user → git, subversion David Murphy, October 2015
44. But where are... → Apache/NGINX? → PHP? David Murphy, October 2015
45. install → configure → control David Murphy, October 2015
46. apt → template → service David Murphy, October 2015
47. Deploying WordPress David Murphy, October 2015
48. Famous 5-Minute Install4 → download/unzip → create database → edit config → upload 4 http://codex.wordpress.org/InstallingWordPress#Famous5-Minute_Install David Murphy, October 2015
49. A better example → install packages → create database, then database user → download/unzip → edit config → configure webserver → ensure webserver is running David Murphy, October 2015
50. First, some variables vars: db_name: wcmcr db_user: wcmcr db_password: correcthorsebatterystaple site_name: wcmcr.schwuk.com site_alias: wcmcr David Murphy, October 2015
51. Install packages - name: Install mysql-server apt: name=mysql-server state=present↩ update_cache=yes cache_valid_time=3600 - name: Install apache2 apt: name=apache2 state=present - name: Install libapache2-mod-php5 apt: name=libapache2-mod-php5 state=present - name: Install php5-mysql apt: name=php5-mysql state=present - name: Install python-mysqldb apt: name=python-mysqldb state=present - name: Install python-httplib2 apt: name=python-httplib2 state=present David Murphy, October 2015
52. Install packages take two - name: Install required packages apt: name: "{{ item }}" state: present update_cache: yes cache_valid_time: 3600 with_items: - mysql-server - apache2 - libapache2-mod-php5 - php5-mysql - python-mysqldb - python-httplib2 David Murphy, October 2015
53. Database setup - name: Create WordPress database mysql_db: name: "{{ db_name }}" state: present - name: Create WordPress user mysql_user: name: "{{ db_user }}" password: "{{ db_password }}" priv: "{{ db_name }}.*:ALL" state: present David Murphy, October 2015
54. Install WordPress - name: Create directory for WordPress file: path: /srv/{{ site_alias }} state: directory mode: 0755 - name: Get WordPress get_url: url: http://wordpress.org/latest.tar.gz dest: /tmp/wordpress.tar.gz - name: Extract WordPress unarchive: src: /tmp/wordpress.tar.gz dest: /srv/{{ site_alias }} copy: no David Murphy, October 2015
55. Edit config - name: Generate Keys and Salts uri: url: https://api.wordpress.org/secret-key/1.1/salt/ dest: /srv/{{ site_alias }}/keys.php creates: /srv/{{ site_alias }}/keys.php - name: Configure WordPress template: src: wp-config.php dest: /srv/{{ site_alias }}/wordpress/wp-config.php owner: root group: root mode: 0644 David Murphy, October 2015
56. wp-config.php template <?php define('DB_NAME', '{{ db_name }}'); define('DB_USER', '{{ db_user }}'); define('DB_PASSWORD', '{{ db_password }}'); define('DB_HOST', 'localhost'); define('DB_CHARSET', 'utf8'); define('DB_COLLATE', ''); include dirname( __FILE__ ) . '../keys.php'; $table_prefix = 'wp_'; define('WP_DEBUG', false); if ( !defined('ABSPATH') ) define('ABSPATH', dirname(__FILE__) . '/'); require_once(ABSPATH . 'wp-settings.php'); David Murphy, October 2015
57. Configure webserver - name: Configure webserver template: src: apache-site.conf dest: /etc/apache2/sites-available/{{ site_alias }}.conf owner: root group: root mode: 0644 notify: - restart apache - name: Disable default site_alias command: a2dissite 000-default - name: Enable WordPress site command: a2ensite {{ site_alias }} David Murphy, October 2015
58. Handlers handlers: - name: restart apache service: name=apache2 state=restarted David Murphy, October 2015
59. demo David Murphy, October 2015
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62. Next steps David Murphy, October 2015
63. Questions? David Murphy, October 2015