13. Jinja2 template for juniper devices configuration
Jinja2 Template | apply name server_ ntp config_junos
File (s):
ansible- configuration.yml
Jinja2 template- config-template.j2
Python- create-config.py
Execute:
root@lab-auto-vm:/etc/python-scripts# python create-config.py
Configuration.yml;
—
name_servers:
– 10.160.39.125
– 10.160.39.126
ntp_servers:
– 10.160.39.125
– 10.160.39.126
syslog_server: syslog.t-i.demo
juniper_devices:
– 192.168.86.174
config-template.j2
system {
time-zone Europe/Amsterdam;
name-server {
{% for name_server in name_servers %}
{{name_server}};
{% endfor %}
}
ntp {
{% for ntp_server in ntp_servers %}
server {{ntp_server}};
{% endfor %}
}
syslog {
host {{syslog_server}} {
any any;
}
}
}
create-config.py
First PyEz test with YAML and jinja2 template engine
YAML file should contain juniper devices to configre
import yaml
from pprint import pprint
from jnpr.junos import Device
from jnpr.junos.utils.config import Config
create datastructure from YAML file.
yaml.load takes a stream so open file object from yaml file.
myvars = yaml.load(open(‘configuration.yml’).read())
myvars has become a python dictionary thanx to YAML lib.
pprint(myvars)
now create juniper device object from Device class and open this device.
for juniper in myvars[‘juniper_devices’]:
print “Configuring %s“ % juniper
device = Device(host=juniper, user=‘root’, password=‘juniper123’)
output = device.open()
now bind Config class to this device which makes it a property of the :class:Device instance
device.bind(cfg=Config)
load can take our jinja2 template with our myvars from YAML file
The following parameters are needed for the load command:
1: template_path (str): path to jinja2 template file
2: template_vars (dict): dictionary build from YAML file, same vars are in jinja2 template
3: set format to text, otherwise you will see errors
device.cfg.load(template_path=‘config-template.j2’, template_vars=myvars, format=‘text’)
print configuration differences
device.cfg.pdiff()
now check configuration and if it’s all OK, just commit.
if device.cfg.commit_check():
device.cfg.commit()
else:
print(“something wrong”)
no close connection to juniper device
device.close()
print “configuration of devices done”