Ansible 101 - Presentation at Ansible STL Meetup
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Jeff Geerling, author of Ansible for DevOps, demonstrates basic Ansible usage on the Dramble, a cluster of six Raspberry Pi 2 computers. This presentation was delivered on July 8, 2015, at the Ansible St. Louis meetup, at Riot Games in Clayton, MO.
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Ansible 101 - Presentation at Ansible STL Meetup
- 1. Ansible 101 Jeff Geerling Ansible St. Louis Meetup - July 8, 2015
- 2. Who am I? ⢠Jeff Geerling (geerlingguy) ⢠Technical Architect, Acquia ⢠Owner, Midwestern Mac LLC ⢠Dev (mainly), Ops
- 3. Ansible for DevOps ⢠On LeanPub ⢠Nearly complete! ⢠50% off: http://bit.ly/ansible-stl
- 4. My Story ⢠First 'real' server build: a 486 PC, RedHat Linux 6 Gateway 2000 4DX2-66v RedHat Linux 6.x
- 5. Today Midwestern Mac Server Check.in Hosted Apache Solr Personal = 50+ prod servers,⨠one very part-time sysadmin
- 6. ⢠âConďŹguration management for humans.â ⢠Uses SSH ⢠Secure, fast, simple ⢠300+ built-in modules ⢠Don't need conďŹguration management to manage your conďŹguration management.
- 7. ⢠âConďŹguration management for humans.â ⢠Uses SSH ⢠Secure, fast, simple ⢠300+ built-in modules ⢠Don't need conďŹguration management to manage your conďŹguration management.  ___________   <  And  cows!  >   -Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ             ^__^             (oo)_______              (__)        )/                  ||-Ââ-Ââ-Ââ-Ââw  |                  ||      ||
- 8. Installation ⢠Python pip: sudo pip install ansible ⢠Mac: brew install ansible ⢠RHEL/CentOS/Fedora: sudo yum install ansible ⢠Deb/Ubuntu:⨠sudo apt-add-repository ppa:ansible/ansible⨠sudo apt-get update⨠sudo apt-get install ansible
- 9. Ansible 101 1. Inventory: Describe your infrastructure 2. Ad-Hoc commands: Run one-off tasks 3. Playbooks: "Infrastructure as code" 4. Roles: Encapsulate conďŹguration
- 10. http://robmyers.org/cc-ironies/no_ďŹash_photography_sign/ Please help me avoid the⨠Xenon Death Flash
- 11. ⢠6-node Raspberry Pi cluster CPU 24 cores / 5.4 GHz RAM 6 GB Storage 96 GB microSD Network 10/100 over Gig https://github.com/geerlingguy/raspberry-pi-dramble The #Dramble
- 12. Inventory [balancer] 10.0.1.60 [webservers] 10.0.1.61 10.0.1.62 10.0.1.63 10.0.1.64 [database] 10.0.1.65 [dramble:children] balancer webservers database [dramble:vars] ansible_ssh_user=pi ⢠INI-syntax (can also use YAML and dynamic sources) ⢠Default location: /etc/ansible/hosts (can override with -i)
- 13. ⢠Check connectivity (always a good ďŹrst step!)⨠$ ansible all -m ping ⢠Have fun with RGB LEDs!⨠$ ansible webservers -a "rgb red" -s Ad-Hoc Commands
- 14. ⢠Check connectivity (always a good ďŹrst step!)⨠$ ansible all -m ping ⢠Have fun with RGB LEDs!⨠$ ansible webservers -a "rgb red" -s Ad-Hoc Commands  ________  <  Shiny!  >   -Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ             ^__^             (oo)_______              (__)        )/                  ||-Ââ-Ââ-Ââ-Ââw  |                  ||      ||
- 15. Demo # Test connectivity. ansible all -m ping # Raspberry Pi RGB LEDs. ansible all -a "rgb green" -s ansible all -a "rgb blue" -s --forks=1 ansible all -a "rgb green" -s --forks=2 ansible all -a "colors 255 255 255" -s # More useful commands. ansible all -m setup ansible all -a "free -m" ansible all -m shell -a "ifconfig | grep inet" -s ansible all -m user -a "name=pgibbons state=absent remove=yes" -s ansible webservers -m service -a "name=nginx state=restarted" -s --forks=2 Download playbook examples
- 16. Playbooks ⢠Ad-Hoc commands don't solve the snowďŹake problem ⢠"infrastructure as code" ⢠Simple YAML ďŹles ⢠Run with: ansible-playbook Unique, by Pen Waggener
- 17. Playbooks #!/bin/bash # Shell script to install/configure Apache. # Install Apache. yum install --quiet -y httpd httpd-devel # Copy configuration files. cp /path/to/config/httpd.conf /etc/httpd/conf/httpd.conf cp /path/to/config/httpd-vhosts.conf /etc/httpd/conf/httpd-vhosts.conf # Start Apache. service httpd start # Set Apache to run on startup. chkconfig httpd on
- 18. Playbooks #!/bin/bash # Shell script to install/configure Apache. # Install Apache. yum install --quiet -y httpd httpd-devel # Copy configuration files. cp /path/to/config/httpd.conf /etc/httpd/conf/httpd.conf cp /path/to/config/httpd-vhosts.conf /etc/httpd/conf/httpd-vhosts.conf # Start Apache. service httpd start # Set Apache to run on startup. chkconfig httpd on --- # Playbook to install/configure Apache. hosts: all tasks: - name: Install Apache. yum: name={{ item }} state=present with_items: - httpd - httpd-devel - name: Copy configuration files. copy: "src={{ item.src }} dest={{ item.dest }}" with_items: - { src: "/path/to/config/httpd.conf", dest: "/etc/httpd/conf/httpd.conf" } - { src: "/path/to/config/httpd-vhosts.conf", dest: "/etc/httpd/conf/httpd-vhosts.conf" } - name: Ensure Apache is started and runs on startup. service: name=httpd state=started enabled=yes
- 19. Demo # Run just the users playbook. ansible-playbook users.ml # Run the users playbook again, to demonstrate idempotence. ansible-playbook users.yml # Run the web playbook (twice, again). ansible-playbook web.yml ansible-playbook web.yml # Run the main playbook that includes users.yml and web.yml ansible-playbook main.yml ansible-playbook main.yml Download playbook examples
- 20. Roles ⢠Like: Libraries, packages, conďŹg bundles ⢠Encapsulate conďŹguration in smaller, reusable chunks ⢠4,000+ contributed roles on Ansible Galaxy ⢠To create: ansible-galaxy init [role-name]
- 21. Demo Role folder structure: rolename/ defaults/ main.yml <-- Most variables go here, so you can override if needed. handlers/ main.yml meta/ main.yml tasks/ main.yml tests/ <-- See Testing Ansible Roles with Travis CI on GitHub vars/ main.yml <-- Special and static variables go here. Download playbook examples
- 22. More Ansible ⢠Ansible Tower, Jenkins integration, CI ⢠Docker integration ⢠AWS, DigitalOcean, Rackspace, Softlayer, Linode, etc. ⢠NotiďŹcations ⢠Rolling updates ⢠Ansible Vault ⢠etc...
- 23. More Ansible ⢠Ansible Tower, Jenkins integration, CI ⢠Docker integration ⢠AWS, DigitalOcean, Rackspace, Softlayer, Linode, etc. ⢠NotiďŹcations ⢠Rolling updates ⢠Ansible Vault ⢠etc...  ______________________________  <  Follow  @AnsiBull  on  Twitter!  >   -Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ-Ââ             ^__^             (oo)_______              (__)        )/                  ||-Ââ-Ââ-Ââ-Ââw  |                  ||      ||
- 24. More Resources ⢠Ansible documentation ⢠Ansible Vagrant examples ⢠Ansible for DevOps ⢠50% off: http://bit.ly/ansible-stl ⢠Raspberry Pi Dramble ⢠Example playbook from this presentation