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Watch NAPALM functions and fire events on specific triggers
===========================================================
.. versionadded:: 2018.3.0
.. note::
The ``NAPALM`` beacon only works only when running under
a regular Minion or a Proxy Minion, managed via NAPALM_.
Check the documentation for the
:mod:`NAPALM proxy module <salt.proxy.napalm>`.
.. _NAPALM: http://napalm.readthedocs.io/en/latest/index.html
The configuration accepts a list of Salt functions to be
invoked, and the corresponding output hierarchy that should
be matched against. To invoke a function with certain
arguments, they can be specified using the ``_args`` key, or
``_kwargs`` for more specific key-value arguments.
The match structure follows the output hierarchy of the NAPALM
functions, under the ``out`` key.
For example, the following is normal structure returned by the
:mod:`ntp.stats <salt.modules.napalm_ntp.stats>` execution function:
.. code-block:: json
{
"comment": "",
"result": true,
"out": [
{
"referenceid": ".GPSs.",
"remote": "172.17.17.1",
"synchronized": true,
"reachability": 377,
"offset": 0.461,
"when": "860",
"delay": 143.606,
"hostpoll": 1024,
"stratum": 1,
"jitter": 0.027,
"type": "-"
},
{
"referenceid": ".INIT.",
"remote": "172.17.17.2",
"synchronized": false,
"reachability": 0,
"offset": 0.0,
"when": "-",
"delay": 0.0,
"hostpoll": 1024,
"stratum": 16,
"jitter": 4000.0,
"type": "-"
}
]
}
In order to fire events when the synchronization is lost with
one of the NTP peers, e.g., ``172.17.17.2``, we can match it explicitly as:
.. code-block:: yaml
ntp.stats:
remote: 172.17.17.2
synchronized: false
There is one single nesting level, as the output of ``ntp.stats`` is
just a list of dictionaries, and this beacon will compare each dictionary
from the list with the structure examplified above.
.. note::
When we want to match on any element at a certain level, we can
configure ``*`` to match anything.
Considering a more complex structure consisting on multiple nested levels,
e.g., the output of the :mod:`bgp.neighbors <salt.modules.napalm_bgp.neighbors>`
execution function, to check when any neighbor from the ``global``
routing table is down, the match structure would have the format:
.. code-block:: yaml
bgp.neighbors:
global:
'*':
up: false
The match structure above will match any BGP neighbor, with
any network (``*`` matches any AS number), under the ``global`` VRF.
In other words, this beacon will push an event on the Salt bus
when there's a BGP neighbor down.
The right operand can also accept mathematical operations
(i.e., ``<``, ``<=``, ``!=``, ``>``, ``>=`` etc.) when comparing
numerical values.
Configuration Example:
.. code-block:: yaml
beacons:
napalm:
- net.interfaces:
# fire events when any interfaces is down
'*':
is_up: false
- net.interfaces:
# fire events only when the xe-0/0/0 interface is down
'xe-0/0/0':
is_up: false
- ntp.stats:
# fire when there's any NTP peer unsynchornized
synchronized: false
- ntp.stats:
# fire only when the synchronization
# with with the 172.17.17.2 NTP server is lost
_args:
- 172.17.17.2
synchronized: false
- ntp.stats:
# fire only when there's a NTP peer with
# synchronization stratum > 5
stratum: '> 5'
Event structure example:
.. code-block:: json
{
"_stamp": "2017-09-05T09:51:09.377202",
"args": [],
"data": {
"comment": "",
"out": [
{
"delay": 0.0,
"hostpoll": 1024,
"jitter": 4000.0,
"offset": 0.0,
"reachability": 0,
"referenceid": ".INIT.",
"remote": "172.17.17.1",
"stratum": 16,
"synchronized": false,
"type": "-",
"when": "-"
}
],
"result": true
},
"fun": "ntp.stats",
"id": "edge01.bjm01",
"kwargs": {},
"match": {
"stratum": "> 5"
}
}
The event examplified above has been fired when the device
identified by the Minion id ``edge01.bjm01`` has been synchronized
with a NTP server at a stratum level greater than 5.
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