1.
What Is NetDevOps?
How?
Leslie Carr
PuppetConf 2015

2.
Who Is Leslie?
Operations Engineer
▪ @lesliegeek
▪ Google
▪ Craigslist
▪ Twitter
▪ Wikimedia Foundation
(Wikipedia)

3.
Now at Cumulus Networks

4.
Who Are You?
Network engineers who are automation curious,
but run their networks in the “traditional” model.
Systems engineers who love your network
engineers and want to help them automate.

5.
What You Will Learn
Legacy Networks -> Modern Techniques

6.
What Is DevOps?
?

7.
What Is DevOps?

8.
DevOps!
Infrastructure == Code

9.
What Do We Look Like Now?

10.
Traditional Networking
▪ Logging in manually with a password
▪ Typing in commands
▪ Cutting and pasting over console
▪ Some vendors have rollback
▪ RANCID is the only decent tool to save
configurations or state
▪ Typos can bring down your whole network

11.
Traditional Networks

12.
Automation is for everyone

13.
Working Together

14.
Common Complaints
▪ It’s a fad
▪ It’s hard
▪ This will steal my job
▪ One wrong move will take everything down
▪ My gear doesn’t support it
▪ I don’t know where to start

15.
Trust

16.
Vendors and Automation!

17.
Here's How to Start

18.
Not Yet….

19.
No Way!

20.
Step 1 - Git!
▪ Source Code text file repository
▪ Automatic file revision/change management
▪ Built for teams to work on the same files
▪ Easy to get started, lots of knobs for advanced
users
cumulusnetworks.com 20

21.
Step 1 - Git!
https://help.github.com/categories/bootcamp/

22.
Git Glossary
cumulusnetworks.com 22
Remote Repository – Central server hosting files
Local Repository – Your local copy of the remote. Where you
change things
Branch – Isolated copy for new features, risky changes
Merge – Apply branch changes to master
repository copy (see also: “Pull Request”)

23.
Step 2
Just check it in!

24.
In Action
cumulusnetworks.com 24

25.
Step 3
Templatize configuration files

26.
Template Example
site.pp: config.pp
node 'network.server' {
switch::config { 'leaf1':
loopback => '10.0.0.1/32',
webservers =>
{ interfaces => 'swp1 swp2 swp5',
vlan => '3' },
storage =>
{ interfaces => 'swp6',
vlan => '10'},
}
}
define switch::config
( $switch = $title, $loopback, $webservers, $storage )
{
file { "/home/switch_configs/${switch}.conf":
ensure => present,
content => template('switch/interfaces.erb')
owner => 'cumulus',
group => 'cumulus',
mode => '0644',
}
}

27.
Template Example
interfaces.erb:
auto eth0
iface eth0 inet dhcp
auto lo
iface lo inet loopback
address <%= @loopback %>
# webserver vlan
auto br_webserver_<%= webservers['vlan'] %>
iface br_webserver_<%= webservers['vlan'] %>
bridge-ports <%= webservers['interfaces'] %>
bridge-stp on
#storage vlan
auto br_storage_<%= storage['vlan'] %>
iface br_storage_<%= storage['vlan'] %>
bridge-ports <%= storage['interfaces'] %>
bridge-stp on

28.
Configuration File!
auto eth0
iface eth0 inet dhcp
auto lo
iface lo inet loopback
address 10.0.0.1/32
# webserver vlan
auto br_webserver_3
iface br_webserver_3
bridge-ports swp1 swp2 swp5
bridge-stp on
#storage vlan
auto br_storage_10
iface br_storage_10
bridge-ports swp6
bridge-stp on

29.
Infrastructure as Code

30.
Team Separation

31.
Git Branches to the Rescue!
▪ Create changes in branches
cumulusnetworks.com 31
master
vlan
▪ Merge and review
master
vlan
Use merge/pull request as
an opportunity to review
impact of changes

32.
Git Branches to the Rescue!

33.
Start a Pull Request

34.
Approve or Deny!

35.
Approved!

36.
Security + Teamwork

37.
Working Together

38.
Advanced Topics

39.
Continuous Integration Systems
Catch tpyos!
Use spell checking
Probably already have one

40.
Virtualization

41.
Puppet Agent

42.
So Happy!

43.
Oops!
site.pp:
node 'network.server' {
switch::config { 'leaf1':
loopback => '10.0.0.1/3',
webservers =>
{ interfaces => 'swp1 swp2 swp5',
vlan => '3' },
storage =>
{ interfaces => 'swp6',
vlan => '10'},
}
}

44.
Uh oh!

45.
Where?

46.
git revert!
cumulusnetworks.com 46
▪ Revert failures after merge
master
IPv6

47.
git revert Workflow
leslie@mogwai:~$ git revert -m 1 HEAD~0
[master 4df89bb] Revert "Merge pull request #1 from LeslieCarr/new_vlan"
1 file changed, 1 deletion(-)
leslie@MacBook-Pro:~/github/puppet-presentation (master)$ git push
To git@github.com:LeslieCarr/puppet-presentation.git
546f0fa..4df89bb master -> master

48.
All Better

49.
No Post Mortem

50.
Post Mortems!
Opportunity, not a chore!
Blameless
Ruthlessly accurate
Fix!

51.
It’s Okay

52.
Benefits
By automating you’ve moved from this

53.
Before Automation

54.
After Automation

55.
Step 1 - git
https://help.github.com/categories/bootcamp/

56.
Infrastructure as Code

57.
Team Separation

58.
Advanced Topics

59.
Teamwork

60.
Questions?
Questions?
@lesliegeek
leslie@cumulusnetworks.com

61.
© 2015 Cumulus Networks. Cumulus Networks, the Cumulus Networks Logo, and Cumulus Linux are trademarks or registered trademarks of Cumulus Networks, Inc. or
its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners. The registered trademark Linux® is used pursuant to a sublicense
from LMI, the exclusive licensee of Linus Torvalds, owner of the mark on a world-wide basis.
▪Thank You!