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What is NetDevOps? Why?Leslie Carr
RIPE71
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Who Is Leslie?
Operations Engineer
● @lesliegeek
● Craigslist
● Wikimedia Foundation
(Wikipedia)
● Cumulus Networks
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Who Are You?
Are you a network engineer?
● Are you automation curious?
● Is your network running in the traditional model?
Are you a systems engineer?
● Do you love your network engineers?
● Do you want to help them automate?
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What Will You Learn? Why Should You Listen?
Legacy Networks -> Modern Techniques
http://www.trefor.net/2015/06/29/network-automation/
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What Is DevOps?
?
https://www.safaribooksonline.com/library/view/effective-devops/9781491926291/
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What Is DevOps?
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DevOps!
Infrastructure == Code
https://www.thoughtworks.com/insights/blog/infrastructure-code-reason-smile
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What Do We Look Like Now?
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Traditional Networking Methodology● 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
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Why is Traditional Networking like this?
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Automation is for you!
https://www.youtube.com/watch?v=ArqvSGRzUBw
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Working Together
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Common Complaints about Automation
● 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
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Trust the Computers
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Vendors and Automation!
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Here's How to Start
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Not Yet….
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No Way!
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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
https://rogerdudler.github.io/git-guide/
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https://try.github.io
http://www.xkcd.com/1597/
Step 1 - Git!
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Git GlossaryRemote 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”)
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Step 2 - Check in Your ConfigurationCheck in ALL THE CONFIGS!
lcarr@Lappy:~/puppet-presentation (master)$ git add *lcarr@Lappy:~/puppet-presentation (master)$ git commit -a -m "New router configs"[master 3dd394a] New router configs 3 files changed, 0 insertions(+), 0 deletions(-) create mode 100644 router1.conf create mode 100644 router2.conf create mode 100644 router3.conflcarr@Lappy:~/puppet-presentation (master)$ git pushCounting objects: 3, done.Delta compression using up to 4 threads.Compressing objects: 100% (2/2), done.Writing objects: 100% (3/3), 377 bytes | 0 bytes/s, done.Total 3 (delta 0), reused 1 (delta 0)To [email protected]:LeslieCarr/puppet-presentation.git 546f0fa..3dd394a master -> masterlcarr@Lappy:~/puppet-presentation (master)$
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Github Changes In Action
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Step 3
Templatize configuration files
● Templates let you reuse code snippets
● Computers never forget… or make typos
https://docs.puppetlabs.com/puppet/latest/reference/lang_template_erb.html
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Template Examplesite.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', }}
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Template Exampleinterfaces.erb:
auto eth0iface eth0 inet dhcp
auto loiface lo inet loopback address <%= @loopback %>
# webserver vlanauto br_webserver_<%= webservers['vlan'] %>iface br_webserver_<%= webservers['vlan'] %> bridge-ports <%= webservers['interfaces'] %> bridge-stp on
#storage vlanauto br_storage_<%= storage['vlan'] %>iface br_storage_<%= storage['vlan'] %> bridge-ports <%= storage['interfaces'] %> bridge-stp on
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Completed 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
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Infrastructure as Code
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Team Separation is a Problem
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Git Branches to the Rescue!●Create changes in branches
master
vlan
●Merge and review
master
vlan
Use merge/pull request as an
opportunity to review impact
of changes
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Git Branches to the Rescue!
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Start a Pull Request on Github
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Approve or Deny the Request!
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Pull Request Approved!
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Pull Requests Allow Security + Teamwork
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Working Together
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Advanced Topics
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Continuous Integration Systems
● Catch tpyos!
● Use spell checking
● Probably already have one
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Virtualization
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Add in an Agent or Pushes
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So Happy!
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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'}, }}
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Pushing a Broken Change
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Where was that change?
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git revert!
▪Revert failures after merge
master
IPv6
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git revert Workflowleslie@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 [email protected]:LeslieCarr/puppet-presentation.git
546f0fa..4df89bb master -> master
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All Better
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No Post Mortem == Wishing For Success
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Post Mortems are Your Friend!
● Opportunity, not a chore!
● Blameless
● Ruthlessly accurate
● Fix!
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Failure is Okay
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Before Automation
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After Automation
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Infrastructure as Code
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Team Separation
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Advanced Topics
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Teamwork
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Questions?
Questions?
@lesliegeek