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diff --git a/docs/services/console-server.rst b/docs/services/console-server.rst new file mode 100644 index 00000000..17d1d4d5 --- /dev/null +++ b/docs/services/console-server.rst @@ -0,0 +1,188 @@ +.. _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 .`` |