Network Devices Configuration backup

This scipt connects to Network devices defined in a hosts file line after line, and takes incremental backups of the configs while saving also the DIFFS between versions.

The current version of it has very verbose output for debug purposes that can be easily reduced.
Also it very easy to hardcode the hosts file and make it run continuously every hour via a cron job.

Requirements

bcrypt==3.1.7
cffi==1.14.0
cryptography==2.9
enum34==1.1.10
ipaddress==1.0.23
paramiko==2.7.1
pkg-resources==0.0.0
pycparser==2.20
PyNaCl==1.3.0
six==1.14.0

Installing

git clone https://github.com/rstoikos/backup_cisco.git

pip install -r requirements.txt

Example

Create a folder e.g netbackup, inside the folder download the script via git and add the text file with the hosts
separated by a new line e.g

R1
R2
192.168.56.102
R4

It is very important to NOT move the script or the folders that would be created afterwards! As it is now it creates the folders and checks inside them for the configuration files , if you move something it might check in wrong folders and mix the configs.

The first time we run the script asks for a file with hostnames or ip addresses on it
then it connects to the routers, create the necessary folder structure for our backups and takes the first backup

root@farm:~/python/netbackup# python backup_cisco.py 
	Enter IP addresses file name 
	# non_existent
	There is no such file
	Enter IP addresses file name 
	# hosts
	File successfully loaded
	Successfully created the directory r2
	Successfully created the directory r3
	Successfully created the directory r4
	Connecting to:  r2
	first back up!
	Connecting to:  r3
	first back up!
	Connecting to:  r4
	first back up!
root@farm:~/python/netbackup# 
root@farm:~/python/netbackup# ls
backup_cisco.py  hosts  r2  r3  r4

The second time we run the script it connects and checks for any differences in the configs , assuming we made no change this is the output now

root@farm:~/python/netbackup# python backup_cisco.py 
	Enter IP addresses file name 
	# hosts
	File successfully loaded
	directory r2 exists!
	directory r3 exists!
	directory r4 exists!
	Connecting to:  r2
	no diffs yet!
	Connecting to:  r3
	no diffs yet!
	Connecting to:  r4
	no diffs yet!
root@farm:~/python/netbackup#

Lets make some change now in R2

root@farm:~/python/netbackup# ssh renos@r2 
Password: 

office-sw>en
Password: 
office-sw#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
office-sw(config)#int loop 22
office-sw(config-if)#ip add 22.22.22.22 255.255.255.255
office-sw(config-if)#description test change!
office-sw(config-if)#end
office-sw#exit
Connection to r2 closed.
root@farm:~/python/netbackup#

Running the script now will print the differences in config , save the new config in a new file , and save also the differences in a separate file

root@farm:~/python/netbackup# python backup_cisco.py 
	Enter IP addresses file name 
	# hosts
	File successfully loaded
	directory r2 exists!
	directory r3 exists!
	directory r4 exists!
	Connecting to:  r2
	'-' signal indicates new lines
	'+' signal indicates removed lines
--- 
+++ 
@@ -1,3 +1,4 @@
+
 office-sw>en
 Password: 
 office-sw#term len 0
@@ -5,9 +6,9 @@
 Building configuration...
 
   
-Current configuration : 1676 bytes
+Current configuration : 1587 bytes
 !
-! Last configuration change at 14:32:09 EET Thu Apr 9 2020 by renos
+! Last configuration change at 14:26:06 EET Thu Apr 9 2020 by renos
 !
 version 15.2
 service timestamps debug datetime msec
@@ -76,10 +77,6 @@
 interface Loopback0
  ip address 192.168.50.2 255.255.255.0
 !
-interface Loopback22
- description test change!
- ip address 22.22.22.22 255.255.255.255
-!
 interface Ethernet0/0
  switchport access vlan 100
 !

	Connecting to:  r3
	no diffs yet!
	Connecting to:  r4
	no diffs yet!
root@farm:~/python/netbackup#

Inside folder r2 we now have the new config , and the DIFF file saved

root@farm:~/python/netbackup# cd r2
root@farm:~/python/netbackup/r2# ls -hal
total 20K
drwxr-xr-x 2 root root 4.0K Apr  9 15:33 .
drwxr-xr-x 5 root root 4.0K Apr  9 15:27 ..
-rw-r--r-- 1 root root 1.9K Apr  9 15:27 r2_2020-04-09_15:27:10
-rw-r--r-- 1 root root 2.0K Apr  9 15:33 r2_2020-04-09_15:33:38
-rw-r--r-- 1 root root  651 Apr  9 15:33 r2_2020-04-09_15:33:38_DIFF
root@farm:~/python/netbackup/r2# cat r2_2020-04-09_15:33:38_DIFF
--- 
+++ 
@@ -1,3 +1,4 @@
+
 office-sw>en
 Password: 
 office-sw#term len 0
@@ -5,9 +6,9 @@
 Building configuration...
 
   
-Current configuration : 1676 bytes
+Current configuration : 1587 bytes
 !
-! Last configuration change at 14:32:09 EET Thu Apr 9 2020 by renos
+! Last configuration change at 14:26:06 EET Thu Apr 9 2020 by renos
 !
 version 15.2
 service timestamps debug datetime msec
@@ -76,10 +77,6 @@
 interface Loopback0
  ip address 192.168.50.2 255.255.255.0
 !
-interface Loopback22
- description test change!
- ip address 22.22.22.22 255.255.255.255
-!
 interface Ethernet0/0
  switchport access vlan 100
 !
root@farm:~/python/netbackup/r2#