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Infrastructure = Code
Georg M. Sorst
CTO, FINDOLOGIC GmbH
What’s the challenge?
Who has already setup 1 server?
2 servers?
10, 1.000, 10.000?
Danger zone
● Setup: Manual shell commands
● Testing: Manual
● Multiple admins: Overwrite each other’s fixes
● Updates: Different versions on every server
Develop like it’s 1999
● Software Development has solved these issues:
● Installation: Deployment Scripts
● Testing: Unit Tests
● Multiple developers: git merge
● Updates: Version tagging
Infrastructure = Code?
● Define the desired state of the servers
● In human readable form
● Commit to VCS
● Automatically run tests
● Setup / Update server with single command
● Fail, fix and deploy
Ansible!
---
- hosts: webservers
tasks:
- name: ensure apache is at the latest version
yum: name=httpd state=latest
- name: write the apache config file
template: src=/srv/httpd.j2 dest=/etc/httpd.conf
notify:
- restart apache
- name: ensure apache is running (and enable it at boot)
service: name=httpd state=started enabled=yes
handlers:
- name: restart apache
service: name=httpd state=restarted
What?
● “Ansible” = fictional instantaneous hyperspace communication system
● Michael DeHaan 2012 / Red Hat
● Python
● Declare desired state, not how to get there
○ name=apache state=present
○ Idempotent
● Agentless
○ Just needs SSH access
● Plain YAML
○ Can be versioned
Structure
● Inventory: Which hosts / hostgroups are available?
● Hosts: Which hosts to run on?
● Vars: Use in config files, tasks etc.
● Tasks: What to do?
● Handlers: Restart service on config change
Inventory
https://docs.ansible.com/ansible/intro_inventory.
html#groups-of-groups-and-group-variables
Playbook
https://github.com/georgms/ansible-
meetup/blob/master/apache.yml
Demo
git clone https://github.com/georgms/ansible-meetup.git
Demo: Ansible + Vagrant
● vagrant up
● vagrant provision
○ Idempotent
● http://localhost:8080/
Demo: Ansible + Docker
● Docker image with SSH + Python
● docker build -t ansible-meetup .
● docker run -i -t -p 8080:80 ansible-meetup
Testing, 1 2, Testing
● Use Ansible test modules
○ Get response from port
○ Check log file contents
● Jenkins: vagrant up
● Travis CI
○ https://github.com/georgms/ansible-meetup/blob/master/.travis.yml
● Automatically build Docker image / Vagrant box
What else
● Ad-hoc tasks: Reboot multiple servers
● Roles: This is a Web-Server, DB-Server, SSH
● Templates: Replace value in config file
● Conditionals: Run only on Ubuntu
● Loops: Install packages, create users
● Vault: Encrypt passwords, private keys
Lessons learned
● Use .d files, eg. /etc/apache2/conf.d/
● Takes a while to have really robust playbooks
○ Absolutely requires automated testing
● Don’t make local changes on servers
○ Commit to repo, run tests, deploy (just like code)
● < cowsay >
--------
 ^__^
 (oo)_______
(__) )/
||----w |
|| ||
Ecosystem
● Ansible Galaxy: More than 5.000 roles available
● Ansible Tower: Centralized control panel, $$$
● Works well with OpenStack (both Red Hat)
What are my options?
● Puppet (requires agent, Ruby DSL)
● Chef (requires agent, Ruby based configs)
● Salt (agentless,YAML config)
Meetup
● 11.05.
Thx
● @piefke_schorsch
● g.sorst@findologic.com

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Infrastructure = Code

  • 1. Infrastructure = Code Georg M. Sorst CTO, FINDOLOGIC GmbH
  • 2. What’s the challenge? Who has already setup 1 server? 2 servers? 10, 1.000, 10.000?
  • 3. Danger zone ● Setup: Manual shell commands ● Testing: Manual ● Multiple admins: Overwrite each other’s fixes ● Updates: Different versions on every server
  • 4. Develop like it’s 1999 ● Software Development has solved these issues: ● Installation: Deployment Scripts ● Testing: Unit Tests ● Multiple developers: git merge ● Updates: Version tagging
  • 5. Infrastructure = Code? ● Define the desired state of the servers ● In human readable form ● Commit to VCS ● Automatically run tests ● Setup / Update server with single command ● Fail, fix and deploy
  • 6. Ansible! --- - hosts: webservers tasks: - name: ensure apache is at the latest version yum: name=httpd state=latest - name: write the apache config file template: src=/srv/httpd.j2 dest=/etc/httpd.conf notify: - restart apache - name: ensure apache is running (and enable it at boot) service: name=httpd state=started enabled=yes handlers: - name: restart apache service: name=httpd state=restarted
  • 7. What? ● “Ansible” = fictional instantaneous hyperspace communication system ● Michael DeHaan 2012 / Red Hat ● Python ● Declare desired state, not how to get there ○ name=apache state=present ○ Idempotent ● Agentless ○ Just needs SSH access ● Plain YAML ○ Can be versioned
  • 8. Structure ● Inventory: Which hosts / hostgroups are available? ● Hosts: Which hosts to run on? ● Vars: Use in config files, tasks etc. ● Tasks: What to do? ● Handlers: Restart service on config change
  • 12. Demo: Ansible + Vagrant ● vagrant up ● vagrant provision ○ Idempotent ● http://localhost:8080/
  • 13. Demo: Ansible + Docker ● Docker image with SSH + Python ● docker build -t ansible-meetup . ● docker run -i -t -p 8080:80 ansible-meetup
  • 14. Testing, 1 2, Testing ● Use Ansible test modules ○ Get response from port ○ Check log file contents ● Jenkins: vagrant up ● Travis CI ○ https://github.com/georgms/ansible-meetup/blob/master/.travis.yml ● Automatically build Docker image / Vagrant box
  • 15. What else ● Ad-hoc tasks: Reboot multiple servers ● Roles: This is a Web-Server, DB-Server, SSH ● Templates: Replace value in config file ● Conditionals: Run only on Ubuntu ● Loops: Install packages, create users ● Vault: Encrypt passwords, private keys
  • 16. Lessons learned ● Use .d files, eg. /etc/apache2/conf.d/ ● Takes a while to have really robust playbooks ○ Absolutely requires automated testing ● Don’t make local changes on servers ○ Commit to repo, run tests, deploy (just like code) ● < cowsay > -------- ^__^ (oo)_______ (__) )/ ||----w | || ||
  • 17. Ecosystem ● Ansible Galaxy: More than 5.000 roles available ● Ansible Tower: Centralized control panel, $$$ ● Works well with OpenStack (both Red Hat)
  • 18. What are my options? ● Puppet (requires agent, Ruby DSL) ● Chef (requires agent, Ruby based configs) ● Salt (agentless,YAML config)