#!/usr/bin/env python
import time
import paramiko

def send_cmd(conn,command):
    conn.send(command + "\n")
    time.sleep(1,0)
    
def get_output(conn):
    return conn.recv(65535).decode("utf-8")

def main():
    host_dict = {"R1": "show running-config | section vrf_definition",
                 "R2": "show running-config vrf",}
    for hostname, vrf_cmd in host_dict.items();
        conn_params = paramiko.SSHClient()
         conn_params.set_missing_host_key_policy(paramiko.AutoAddPolicy)
        conn_params.connect(
        hostname = hostname, port22=22, username="pyuser",password="pypass",look_for_keys=False, allow_agent=False,)
        conn = conn_params.invoke_shell()
        time_sleep(1,0)
        print(f"Logged into {get_output(conn).strip()} successfully")
        commands = [vrt_cmd,]
        concat_ouput = ""
        for command in commands:
             send_cmd(conn,command)
             #print(get_ouput(conn)),printing the info is less  valuable than wr             #it
             concat_ouput += get_output(conn) 
        conn.close()
        print(f"Writing {hostname} facts to file")
        with open(f"{hostname}_facts.txt","w") as handle:
             handle.write(concat_output)
if __name__ == "__main__":
   mian()

add breakpoint() underneath for command in commands
python get_write.py
type: command->step

Core IAC Concepts

State declaration, Abstraction, Version control. YAML format data

vrf_name: "POLICE"
route_import:
  - "65000:1"
  - "65000:2"
route-export:
  - "65000:1"

In this case, we should only leave route target we need.

Multi-platform Abstraction, we need to keep in mind IOS-XE and IOS-XR templates are different. But the concept are universal.

Infrasture as code

# Define list of hosts, key-value pair yml file
---
host_list:
  - name: R1
    vrf_cmd: "show running-config | section vrf_def"
    platform: ios
  - name: R2
    vrf_cmd: "show running-config vrf"
    platform: iosxr

lets make another python file, I am literally dying right now..

def main():
    with open("hosts.yml","r") as handle:
         host_root = safe_load(handle)
    for host in host_root["host_list"]:
        with open(f"vars/{host['name']}_vrfs.yml","r") as handle:
             vrfs = safe_load(handle)
             #jijan2 programming
             j2_env = Environment( loader = FileSystemLoader("."),trim_blocks=True,autoescape= True)
         template = j2_env.get_template(
             f"templates/paramiko/{host[platform']}_vpn.j2"
         new_vrf_config = template.render(data=vrfs)