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.. _console_server:
##############
Console Server
##############
Starting of with VyOS 1.3 (equuleus) we added support for running VyOS as an
Out-of-Band Management device which provides remote access by means of SSH to
directly attached serial interfaces.
Serial interfaces can be any interface which is directly connected to the CPU
or chipset (mostly known as a ttyS interface in Linux) or any other USB to
serial converter (Prolific PL2303 or FTDI FT232/FT4232 based chips).
If you happened to use a Cisco NM-16A - Sixteen Port Async Network Module or
NM-32A - Thirty-two Port Async Network Module - this is your VyOS replacement.
Setup
=====
In the past serial interface have been defined as ttySx and ttyUSBx where x was
an instance number of the serial interface. It was discovered that from system
boot to system boot the mapping of USB based serial interfaces will differ,
depending which driver was loaded first by the operating system. This will become
rather painful if you not only have serial interfaces for a console server
connected but in addition also a serial backed :ref:`wwan-interface`.
To overcome this issue and the fact that in almost 50% of all cheap USB to serial
converters there is no serial number programmed, the USB to serial interface is
now directly identified by the USB root bridge and bus it connects to. This
somehow mimics the new network interface definitions we see in recend Linux
distributions.
For additional details you can refer to https://phabricator.vyos.net/T2490.
.. opcmd:: show system usb
Retrieve a tree like representation of all connected USB devices.
.. note:: If a device is unplugged and re-plugged it will receive a new
Port, Dev, If identification.
.. code-block:: none
vyos@vyos:~$ show system usb
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 3: Dev 4, If 0, Class=Vendor Specific Class, Driver=qcserial, 480M
|__ Port 3: Dev 4, If 2, Class=Vendor Specific Class, Driver=qcserial, 480M
|__ Port 3: Dev 4, If 3, Class=Vendor Specific Class, Driver=qcserial, 480M
|__ Port 3: Dev 4, If 8, Class=Vendor Specific Class, Driver=qmi_wwan, 480M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=pl2303, 12M
|__ Port 2: Dev 3, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 5, If 2, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 5, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 5, If 3, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 5, If 1, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 3: Dev 4, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 3: Dev 6, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 8, If 2, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 8, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 8, If 3, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 8, If 1, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 7, If 3, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 7, If 1, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 7, If 2, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
|__ Port 4: Dev 7, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 480M
.. opcmd:: show system usb
Retrieve a list and description of all connected USB serial devices. The device name
displayed, e.g. `usb0b2.4p1.0` can be directly used when accessing the serial console
as console-server device.
.. code-block:: none
vyos@vyos$ show system usb serial
Device Model Vendor
------ ------ ------
usb0b1.3p1.0 MC7710 Sierra Wireless, Inc.
usb0b1.3p1.2 MC7710 Sierra Wireless, Inc.
usb0b1.3p1.3 MC7710 Sierra Wireless, Inc.
usb0b1p1.0 USB-Serial_Controller_D Prolific Technology, Inc.
usb0b2.3.3.4p1.0 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.3.3.4p1.1 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.3.3.4p1.2 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.3.3.4p1.3 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.3.4p1.0 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.3.4p1.1 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.3.4p1.2 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.3.4p1.3 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.4p1.0 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.4p1.1 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.4p1.2 Quad_RS232-HS Future Technology Devices International, Ltd
usb0b2.4p1.3 Quad_RS232-HS Future Technology Devices International, Ltd
Configuration
=============
Between computers, the most common configuration used was "8N1": eight bit
characters, with one start bit, one stop bit, and no parity bit. Thus 10 Baud
times are used to send a single character, and so dividing the signalling
bit-rate by ten results in the overall transmission speed in characters per
second. This is also the default setting if none of those options are defined.
.. cfgcmd:: set service console-server <device> data-bits [7 | 8]
Configure either seven or eight data bits. This defaults to eight data
bits if left unconfigured.
.. cfgcmd:: set service console-server <device> description <string>
A user friendly description identifying the connected peripheral.
.. cfgcmd:: set service console-server <device> parity [even | odd | none]
Set the parity option for the console. If unset this will default to none.
.. cfgcmd:: set service console-server <device> stop-bits [1 | 2]
Configure either one or two stop bits. This defaults to one stop bits if
left unconfigured.
.. cfgcmd:: set service console-server <device> speed [ 300 | 1200 | 2400 | 4800 | 9600 | 19200 | 38400 | 57600 | 115200 ]
.. note:: USB to serial converters will handle most of their work in software
so you should be carefull with the selected baudrate as some times they
can't cope with the expected speed.
Remote Access
-------------
Each individual configured console-server device can be directly exposed to
the outside world. A user can directly connect via SSH to the configured
port.
.. cfgcmd:: set service console-server <device> ssh port <port>
Accept SSH connections for the given `<device>` on TCP port `<port>`.
After successfull authentication the user will be directly dropped to
the connected serial device.
.. hint:: Multiple users can connect to the same serial device but only
one is allowed to write to the console port.
Operation
=========
.. opcmd:: show console-server ports
Show configured serial ports and their respective interface configuration.
.. code-block:: none
vyos@vyos:~$ show console-server ports
usb0b2.4p1.0 on /dev/serial/by-bus/usb0b2.4p1.0@ at 9600n
.. opcmd:: show console-server user
Show currently connected users.
.. code-block::
vyos@vyos:~$ show console-server user
usb0b2.4p1.0 up vyos@localhost
.. opcmd:: connect console-server <device>
Locally connect to serial port identified by `<device>`.
.. code-block:: none
vyos@vyos-r1:~$ connect console-server usb0b2.4p1.0
[Enter `^Ec?' for help]
[-- MOTD -- VyOS Console Server]
vyos-r2 login:
.. hint:: Multiple users can connect to the same serial device but only
one is allowed to write to the console port.
.. hint:: The sequence ``^Ec?`` translates to: ``Ctrl+E c ?``. To quit
the session use: ``Ctrl+E c .``
|
