Backup Cisco,Juniper routers,Catalyst,Foundry switches Configuration Using Rancid
What is Rancid ?
RANCID monitors a router's (or more generally a device's) configuration,including software and hardware (cards, serial numbers, etc) and uses CVS (Concurrent Version System) or Subversion to maintain history of changes.
What RANCID Does
login to each device in the router table (router.db),run various commands to get the information that will be saved,cook the output; re-format, remove oscillating or incrementing data,email any differences from the previous collection to a mail list,and finally commit those changes to the reivision control system
Once you've got the rancid archive, you need to uncompress it (in /usr/src for example)
# cp rancid-2.3.1.tar.gz /usr/src
# cd /usr/src
# tar xvfz rancid-2.3.1.tar.gz
# cd rancid-2.3.1
and Now you need install it
Note : The following commands have to be typed as root. But once Rancid is installed, rancid user MUST be owner of his directory (chown -R rancid:rancid /usr/local/rancid).
# ./configure -prefix=/usr/local/rancid
There is a sample password file named cloginrc.sample. You'll need to copy it to the /usr/local/rancid/ home directory as the hidden file /usr/local/rancid/.cloginrc.
# cp cloginrc.sample /usr/local/rancid/.cloginrc
Finally you will need to set the .cloginrc file permissions to be readable by the rancid user and the new netadm Linux group. You will also have to change the ownership and permissions of the home directory in a similar
#chmod 0640 /usr/local/rancid/.cloginrc
#chown -R rancid:netadm /usr/local/rancid/
#chmod 770 /usr/local/rancid/
Now that the installation is complete, you'll need to do some initial configuration to get Rancid to work.
Now We create a group called debianhelp in the rancid configuration by editing the file /home/rancid/etc/rancid.conf.All files related to this group will be stored in a sub-directory of the same name under the var sub-directory of the Rancid home directory. In other words /usr/local/var/debianhelp
By default Rancid filters out passwords and SNMP community strings. You may want to set the FILTER_PWDS and NOCOMMSTR variables to "NO" to prevent this.
FILTER_PWDS=NO; export FILTER_PWDS
NOCOMMSTR=NO; export NOCOMMSTR
Rancid will send status emails to mailing lists defined in the /etc/aliases file. The "debianhelp" Rancid group will need to have groups named rancid-admin-networking and rancid-networking. A Rancid group named
"alldevices" would have groups named rancid-admin-alldevices and rancid-alldevices.
In this example, the emails go to the noc mailing list made up of the addresses [email protected]
The Rancid network device list and password files will now have to be edited before your configurations can be backed up, but first, let's review the most important file locations.
Rancid router.db file
The router.db file is the device list rancid uses to do its backups. It has the format:
Where dns-name-or-ip-address is the hostname or IP address of the device,device-type is the expected type of operating system the device should be running and status (which can be up or down) which determines whether the device should be backed up or not. This example is for a Cisco device with an IP address of 18.104.22.168.
Note: According to the Rancid help pages, "a '#' at the beginning of a line is considered as a comment and the entire line is ignored. If a device is deleted from the router.db file, then Rancid will clean up by removing the
device's configuration file /usr/local/rancid/var/debianhelp/configs directory. The CVS information for the device will be moved to CVS Attic directory (using cvs delete)."
Rancid .clogin.rc file
The .clogin.rc file lists all the passwords rancid will use. The one that comes with the Rancid installation kit has a lot of examples in it and is fairly self-explanatory. Unfortunately some of the examples are not
commented out, so you will have to do so yourself. Here is a sample snippet using some commonly encountered scenarios.