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RANCID / Version Control. AfNOG 11, Kigali/Rwanda. Agenda. What is RANCID? What can I do with RANCID? Version Control Systems Setting up RANCID A few more considerations. What is RANCID?. R eally  A wesome  N ew  C isco Conf I g  D iffer Not only for Cisco now though

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rancid version control

RANCID / Version Control

AfNOG 11, Kigali/Rwanda

agenda
Agenda
  • What is RANCID?
  • What can I do with RANCID?
  • Version Control Systems
  • Setting up RANCID
  • A few more considerations
what is rancid
What is RANCID?
  • Really Awesome New Cisco ConfIg Differ
    • Not only for Cisco now though
  • Monitors a set of routers/devices configuration and hardware status and keeps track of changes
  • Keeps configurations in a versioning system (CVS or subversion)
  • Can notify by email on configuration changes
what can i do with rancid
What can I do with RANCID?
  • Backup configurations of your network devices (in case of emergency) and keep inventory
  • Keep track of changes (when did we put in this line/this linecard)
  • Be informed when someone with access does changes to the ACLs or something similar
  • Help with network monitoring
    • Not everything can be checked via SNMP
    • Great ideas in NANOG 2005 techtalk
version control systems
Version Control systems
  • Rancid uses version control system CVS (or subversion)
  • Version control systems keep history of a file, when and how it was changed, after it was changed
  • Used mostly by programmers to keep track of changes or be able to rollback changes
  • You can look at the log,differences between any versions, find who is to blame for a change
    • Juniper users have one for the last few changes built into the OS
  • If you're unfamiliar CVS might be hard to use 
    • cvs log/cvs diff might be the first things to look at
    • there's long man pages, guides (see last slide) 
    • or use a web client which is easier (CVSWeb)
setting up rancid
Setting up RANCID
  • Author speaks of an "easy 12-step install process"
  • The first two are taken care off with current Ubuntu and apt-get (sudo apt-get install rancid-core rancid-util build-essential expect)
  • We'll go through the rest, but a few concepts:
    • You have groups of devices in rancid.conf
    • Every group has a routers.db file which lists status
    • Login to devices through a tool called clogin (or jlogin/flogin etc.), has it's own configuration
    • If you want the email functionality, it uses your MTA (like sendmail/exim) so configure that correctly
    • Run it every hour or so by using a cronjob
a few more considerations
A few more considerations
  • Security
    • RANCID needs permissions to run "show running-configuration" - on Cisco that means a user with privilege 15
    • Make sure to secure your box (password is in cleartext), and ACL the router, or restrict RANCID user to show commands with TACACS
  •  clogin/jlogin
    • These tools to login to routers might be useful for yourself if you do it often
    • Same security questions apply
  • Seriously, you can do so much more with the data collected
    • Check Stephen Stuart's NANOG 2005 techtalk for a few ideas
references
References
  • RANCID homepage http://www.shrubbery.net/rancid/
  • NANOG 26, Stephen Stuart's Presentationhttp://goo.gl/E580
  • CVS for new usershttp://ximbiot.com/cvs/cvshome/new_users.html
  • CVSWebhttp://www.freebsd.org/projects/cvsweb.html
  • Exercises for these slides