NAME
rancid_intro - introduction to the Really Awesome New Cisco confIg
Differ
INTRODUCTION
rancid is really more than just a Cisco configuration differ. It
handles several different device’s configurations; currently including
Alteon, Arista, Bay Networks (Nortel), Cisco, Extreme, F5 BigIP,
Force10, Fortinet, Foundry, HP Procurve switches, Hitachi, Juniper
Routers and edge (ERX) routers, Lucent TNT, MRTd daemon, Netscalar load
balancers, Netscreen firewalls, Procket, Redback, SMC switches, Zebra
routing software, and the ADC-Kentrox EZ-T3 mux.
rancid uses an expect script to login to each of a list of devices and
run a set of commands for that device-type and collects the output.
The output is run through some filtering to summarize, reformat, and/or
snip unwanted or security related data such as chassis temperature and
easily reverse-able passwords.
Named after the device’s name in the group’s configuration file
(router.db), the resulting files are saved in the directory
<group>/configs. Except for the data filtered from the configuration
file for security reasons, such as reversable passwords, these files
are suitable for loading directly to restore a lost configuration. See
rancid.conf(5) for more information on <group>s.
After filtering, a uni-diff (see diff(1)) of the result is produced for
each of the devices in a group against that of the previous run of
rancid and is e-mailed to that group’s mail list, "rancid-<group>".
This e-mail will also include any differences of the device list in the
group’s configuration file, router.db.
Lastly, all the updated files are checked into the revision control
system (CVS or Subversion).
Additional utilities, including a looking glass, come with rancid. See
rancid’s share directory ( share/rancid).
EXAMPLE E-MAIL
Below is a sample of a uni-diff produced from the group "shrubbery" for
the device named dfw.shrubbery.net, which happens to be a Cisco GSR.
From: rancid
To: rancid-shrubbery@shrubbery.net
Subject: shrubbery router config diffs
Precedence: bulk
Index: configs/dfw.shrubbery.net
===================================================================
retrieving revision 1.144
diff -u -4 -r1.144 dfw.shrubbery.net
@@ -57,14 +57,8 @@
!Slot 2/MBUS: hvers 1.1
!Slot 2/MBUS: software 01.36 (RAM) (ROM version is 01.33)
!Slot 2/MBUS: 128 Mbytes DRAM, 16384 Kbytes SDRAM
!
- !Slot 6: 1 Port Gigabit Ethernet
- !Slot 6/PCA: part 73-3302-03 rev C0 ver 3, serial CAB031216OL
- !Slot 6/PCA: hvers 1.1
- !Slot 6/MBUS: part 73-2146-07 rev B0 dev 0, serial CAB031112SB
- !Slot 6/MBUS: hvers 1.2
- !Slot 6/MBUS: software 01.36 (RAM) (ROM version is 01.33)
!Slot 7: Route Processor
!Slot 7/PCA: part 73-2170-03 rev B0 ver 3, serial CAB024901SI
!Slot 7/PCA: hvers 1.4
!Slot 7/MBUS: part 73-2146-06 rev A0 dev 0, serial CAB02060044
In this example, we see that a Gigabit Ethernet linecard was removed
from slot 6. However, since this data is collected from "show"
commands on the router, it could just as easily be that the card
crashed so the RP can not communicate with it to collect information.
GETTING STARTED
Installation instructions are included in the distribution’s top-level
directory in the README file (which will be installed in share/rancid).
Once the installation is complete, start by reading the man pages
listed below or follow the basic instructions included in the README
file.
See http://www.shrubbery.net/rancid for information on new versions,
mail lists, etc.
ADDING NEW GROUPS
Follow this procedure for adding new groups:
o Update the LIST_OF_GROUPS variable in etc/rancid.conf (see
rancid.conf(5)).
o Run rancid-cvs(1).
o Update the system’s mail aliases file /etc/aliases (see
rancid.conf(5)).
SEE ALSO
clogin(1), cloginrc(5), control_rancid(1), lg_intro(1), rancid(1),
rancid-run(1), rancid.conf(5), router.db(5)
14 july 2009 rancid_intro(1)