Try Juniper JUNOS PyEz (python library) Memo 1 ~ PyEz Overview ~

1. Overview

In recent years, attention has been increasing to AI, robots, automation, etc., and automation / automation, scripting are also attracting attention in networks. Juniper Networks, one of the major network vendors, publishes various tools and APIs on the network OS JUNOS with the following automation stack to provide an environment that can respond to various automation requirements.

This time, I will try PyEz, which is a Python framework that I couldn't find much information in Japanese. PyEz seems to be able to use Python for Easy, and even non-skilled programmers can easily acquire / extract information and change settings remotely with python.

The Juniper documentation states that PyEz will provide: * 1

• Operation information and facts can be retrieved from the device, and RPC (remote procedure call) can be executed by Junos XML API.
• Provides software utilities like Junos OS installation, reboot, shutdown
• Providing management utilities such as configuration comparison, rescue configuration settings, and uploading configuration changes
• Supports ASCII text, Junos XML elements, Junos OS set commands, as well as Jinja2 templates and flexible customizable templates for uploading config changes
• System utilities provide common administrator tasks such as file copy and checksum calculation
• Use Tables and Views to efficiently retrieve operational and configuration information from the running Junos OS
• Tables and Views allow Junos OS commands equivalent to RPC to be used to extract and customize information
• By utilizing these, it is possible to extract only the necessary fields from the output results of built-in commands such as show route and show inteface.

The documents that can be searched are only in English, but [PyEz Techwiki](http://forums.juniper.net/t5/Automation/Where-can-I-learn-more-about-Junos-PyEZ/ta-p / 280496) and Python EZ Google, so you can check and ask questions there.

2. Environmental preparation

This time, using vSRX * 2 which can be tried for free and a server (Amazon Linux AMI 2016.03.3) that can be used in the free frame of AWS EC2, try setting confirmation and setting change with PyEz.

To use PyEz, you need to install a package called junos-eznc, which is why [Junos PyEZ Dependencies](https://www.juniper.net/techpubs/en_US/junos-pyez1.2/topics/ Install the package according to the OS used by referring to task / installation / junos-pyez-server-installing.html).

The AWS Linux AMI is a Linux OS originally provided by AWS based on RHEL, so the packages required for CentOS are installed.

However, when I tried to install the PyEz package with the pip command (# pip install junos-eznc), I got "fatal error: openssl / opensslv.h: No such file or directory". Therefore, if you also install openssl-devel, you can also install junos-eznc.

The current PyEz supports python 2.6 or 2.7, and the AWS Linux AMI comes with Python 2.7 pre-installed.

If the installation is successful, pytyon will be able to import the following PyEz related modules.

$ python
>>> from jnpr.junos import Device
>>> 

If the installation is not successful, for example, the following error.

>>> from jnpr.junos import Device
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named jnpr.junos

For each module, refer to here.

Since the actual connection uses netconf over SSH, JUNOS also needs to be set in advance.

user@host# set system services netconf ssh port 22
user@host# commit

Now that the environment is ready, next time I will try to get information and change settings of JUNOS.

Reference link:

Juniper Tech Library: Junos PyEZ*1　 slide share: Start with PC vSRX * 2 　PyEz Techwiki 　Python EZ Google