139 lines
4.1 KiB
ReStructuredText
139 lines
4.1 KiB
ReStructuredText
Node monitoring
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===============
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Gluon is capable of announcing information about each node to the mesh
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and to neighbouring nodes. This allows nodes to learn each others hostname,
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IP addresses, location, software versions and various other information.
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Format of collected data
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------------------------
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Information to be announced is currently split into three categories:
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nodeinfo
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In this category (mostly) static information is collected. If
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something is unlikely to change without human intervention it should be
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put here.
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statistics
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This category holds fast changing data, like traffic counters, uptime,
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system load or the selected gateway.
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neighbours
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`neighbours` contains information about all neighbouring nodes of all
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interfaces. This data can be used to determine the network topology.
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All categories will have a ``node_id`` key. It should be used to
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relate data of different categories.
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Accessing Node Information
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--------------------------
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There are two packages responsible for distribution of the information. For
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one, information is distributed across the mesh using alfred_. Information
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between neighbouring nodes is exchanged using `gluon-respondd`.
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.. _alfred: https://www.open-mesh.org/projects/alfred
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alfred (mesh bound)
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~~~~~~~~~~~~~~~~~~~
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The package ``gluon-alfred`` is required for this to work.
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Using alfred both categories are distributed within the mesh. In order to
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retrieve the data you'll need both a local alfred daemon and alfred-json_
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installed. Please note that at least one alfred daemon is required to run as
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`master`.
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.. _alfred-json: https://github.com/ffnord/alfred-json
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The following datatypes are used:
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* `nodeinfo`: 158
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* `statistics`: 159
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* `neighbours`: 160
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All data is compressed using GZip (alfred-json can handle the decompression).
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In order to retrieve statistics data you could run:
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::
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# alfred-json -z -r 159
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{
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"f8:d1:11:7e:97:dc": {
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"processes": {
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"total": 55,
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"running": 2
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},
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"idletime": 30632.290000000001,
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"uptime": 33200.07,
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"memory": {
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"free": 1660,
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"cached": 8268,
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"total": 29212,
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"buffers": 2236
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},
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"node_id": "f8d1117e97dc",
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"loadavg": 0.01
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},
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"90:f6:52:3e:b9:50": {
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"processes": {
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"total": 58,
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"running": 2
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},
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"idletime": 28047.470000000001,
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"uptime": 33307.849999999999,
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"memory": {
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"free": 2364,
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"cached": 7168,
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"total": 29212,
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"buffers": 1952
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},
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"node_id": "90f6523eb950",
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"loadavg": 0.34000000000000002
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}
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}
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You can find more information about alfred in its README_.
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.. _README: https://git.open-mesh.org/alfred.git/blob_plain/refs/heads/master:/README.rst
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gluon-respondd
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~~~~~~~~~~~~~~
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`gluon-respondd` allows querying neighbouring nodes for their information.
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It is a daemon listening on the multicast address ``ff02::2:1001`` on
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UDP port 1001 on both the bare mesh interfaces and `br-client`. Unicast
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requests are supported as well.
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The supported requests are:
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* ``nodeinfo``, ``statistics``, ``neighbours``: Returns the data of single category uncompressed.
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* ``GET nodeinfo``, ...: Returns the data of one or multiple categories (separated by spaces)
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compressed using the `deflate` algorithm (without a gzip header). The data may
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be decompressed using zlib and many zlib bindings using -15 as the window size parameter.
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gluon-neighbour-info
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~~~~~~~~~~~~~~~~~~~~
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The program `gluon-neighbour-info` can be used to retrieve
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information from other nodes.
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::
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gluon-neighbour-info -i wlan0 \
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-p 1001 -d ff02:0:0:0:0:0:2:1001 \
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-r nodeinfo
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An optional timeout may be specified, e.g. `-t 5` (default: 3 seconds). See
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the usage information printed by ``gluon-neighbour-info -h`` for more information
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about the supported arguments.
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Adding a data provider
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----------------------
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To add a provider, you need to install a shared object into ``/lib/gluon/respondd``.
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For more information, refer to the `respondd README <https://github.com/freifunk-gluon/packages/blob/master/net/respondd/README.md>`_
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and have a look the existing providers.
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