Initial commit

.gitignore

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+
+
+# https://github.com/github/gitignore/blob/master/Python.gitignore
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/

README.md

@@ -1,2 +1,5 @@
 # devnet-experiments
-Scripts experimenting with elements of devnet coding
+
+This repository contains scripts which I am using to test out logic or functions related to devnet type topics.
+
+The scripts are by nature very hacky, so don't @ me about it.

bootstrap/README.md

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+# Bootstrap
+
+Bringing together the results from templating and threading, as well as the netmiko example from the VIRL/CML dicumentation, this script configures up 5 switches in a VIRL environment to give them hostnames, management IPs and enable ssh.
+
+One thing I have noticed is that netmiko doesn't seem to handle console messages very well when connected to a device console, so that gets disabled before the script applies any true configuration.
+
+It largely works, but sometimes the netmiko redispatch fails. I haven't worked out why that is. It may be that the default hostname on the IOSv_L2 images in VIRL has an underscore in it and that throws the prompt parser.
+
+Regardless, the script appears to work on a second run, so it's not a major issue.

bootstrap/bootstrap.py

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+import yaml
+import netmiko
+import time
+import jinja2
+import getpass
+from concurrent.futures import ThreadPoolExecutor
+from threading import Lock
+from virl2_client import ClientLibrary
+
+DEFAULTS = {
+    "domainname":"lab.home",
+    "mgmt_subnet":"255.255.255.0",
+    "mgmt_vrf":"mgmt-vrf",
+    "mgmt_vlan":"10",
+    "default_gw":"10.144.35.1",
+    "dev_username":"cisco",
+    "dev_password":"cisco",
+    "lab_id":"Lab1"
+}
+
+print_lock = Lock()
+
+def config_worker(param):
+
+    netmiko_delay=0.1
+
+    client = ClientLibrary(param["virl_controller"],
+                       param["virl_username"],
+                       param["virl_password"],
+                       ssl_verify=False)
+    client.wait_for_lld_connected()
+
+    with print_lock:
+        print(f"{param['hostname']}: Connected to VIRL")
+
+    our_lab = client.find_labs_by_title(param["lab_id"])[0]
+    our_node = our_lab.get_node_by_label(param["hostname"])
+
+
+    with print_lock:
+        print(f"{param['hostname']}: Identified lab and device: /{our_lab.id}/{our_node.id}/0")
+
+    c = netmiko.ConnectHandler(device_type='terminal_server',
+                           host=param["virl_controller"],
+                           username=param["virl_username"],
+                           password=param["virl_password"])
+
+    with print_lock:
+        print(f"{param['hostname']}: Connected to terminal server")
+
+    c.write_channel('\r\n')
+    time.sleep(1)
+    c.write_channel('\r\n')
+    time.sleep(1)
+
+    c.write_channel(f'open /{our_lab.id}/{our_node.id}/0\r')
+
+    c.write_channel('\r\n')
+    time.sleep(1)
+    c.write_channel('\r\n')
+    time.sleep(1)
+    c.write_channel('\r\n')
+    time.sleep(1)
+    c.write_channel('\r\n')
+
+    with print_lock:
+        print(f"{param['hostname']} : Switching to IOS interpreter")
+    try:
+        netmiko.redispatch(c, device_type='cisco_ios')
+    except Exception as e:
+        with print_lock:
+            print(f"{param['hostname']} : Failed to switch to IOS interpreter. {e}")
+    c.find_prompt()
+    #c.enable()
+
+    with print_lock:
+        print(f"{param['hostname']} : Preparing config")
+    try:
+        with open('swtemplate.j2','r') as f:
+            template = jinja2.Template(f.read())
+        config_to_send = template.render(device=param).split('\n')
+    except:
+        with print_lock:
+            print(f"{param['hostname']} : Failed to prepare config")
+
+
+    with print_lock:
+        print(f"{param['hostname']} : Sending config")
+
+    try:
+        ## I have found that console messages can upset netmiko, so turn them off with a timed command
+        c.send_command_timing(f"enable", netmiko_delay)
+        c.send_command_timing(f"conf t", netmiko_delay)
+        c.send_command_timing(f"no logging console", netmiko_delay)
+        c.send_command_timing("end", netmiko_delay)
+        time.sleep(1)
+        c.write_channel('\r\n')
+        c.find_prompt()
+        c.send_config_set(config_to_send)
+        with print_lock:
+            print(f"{param['hostname']} : Config sent")
+
+    except Exception as e:
+        with print_lock:
+            print(f"{param['hostname']} : Error, send config failed. {e}")
+
+
+
+
+if __name__ == "__main__":
+    with open('devices.yaml','r') as f:
+        devices = yaml.safe_load(f)
+
+    DEFAULTS["virl_controller"] = input("VIRL controller: ")
+    DEFAULTS["virl_username"] = input('VIRL username: ')
+    DEFAULTS["virl_password"] = getpass.getpass('VIRL password: ')
+
+    with ThreadPoolExecutor(max_workers=5) as executor:
+        for device in devices:
+            executor.submit(config_worker, ({**DEFAULTS, **device}))

bootstrap/devices.yaml

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+---
+- hostname: "S1"
+  mgmt_ip: "10.144.35.21"
+- hostname: "S2"
+  mgmt_ip: "10.144.35.22"
+- hostname: "S3"
+  mgmt_ip: "10.144.35.23"
+- hostname: "S4"
+  mgmt_ip: "10.144.35.24"
+- hostname: "S5"
+  mgmt_ip: "10.144.35.25"

bootstrap/swtemplate.j2

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+hostname {{ device.hostname }}
+no ip domain-lookup
+ip domain-name {{ device.domainname }}
+!
+vlan {{ device.mgmt_vlan }}
+ name mgmt_vlan
+ exit
+!
+vrf definition mgmt-vrf
+ address-family ipv4
+ exit-address-family
+!
+interface vlan {{ device.mgmt_vlan }}
+ vrf forwarding {{ device.mgmt_vrf }}
+ ip address {{ device.mgmt_ip }} {{ device.mgmt_subnet }}
+ no shut
+!
+int gi0/0
+ swi mod acc
+ swi acc vla {{ device.mgmt_vlan }}
+ descr Management
+ no shut
+!
+int ra gi0/1 - 3
+ shut
+!
+ip route vrf {{ device.mgmt_vrf }} 0.0.0.0 0.0.0.0 {{ device.default_gw }}
+!
+username cisco priv 15 password cisco
+!
+line vty 0 16
+ login local
+ transport input all
+!
+no banner incoming
+no banner exec
+no banner login
+!
+crypto key generate rsa modulus 1024

templating/README.md

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+# Playing with Jinja2
+
+Just experimenting with using jinja2 for templating switch configuration, and also using yaml to bring in the inventory and device configs.
+
+This script doesn't connect to anything to make any changes, it just prints out what it might send.

templating/devices.yaml

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+---
+- hostname: "S1"
+  mgmt_if: "vlan1"
+  mgmt_ip: "10.144.35.21"
+  interfaces:
+  - name: "Gi0/0"
+    description: "Connection to mgmt switch"
+    active: True
+    mode: "access"
+    vlans: "1"
+  - name: "Gi0/1"
+    description: "N/C"
+    active: False
+  - name: "Gi0/2"
+    description: "N/C"
+    active: False
+  - name: "Gi0/3"
+    description: "N/C"
+    active: False 
+# - hostname: "S2"
+#   mgmt_if: "vlan1"
+#   mgmt_ip: "10.144.35.22"