Ubuntu Enable Serial Console
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I needed to be able to connect to an Ubuntu server via a serial cable. I have had such a hard time getting this to work, and to automatically run on startup that I thought I would post it here for anyone else needing this functionality.
This doesn't work through grub or the whole boot process, it is just for connecting via a serial cable after the server boots up.
I used a serial cable from my server to another computer. The server serial port is ttyS0
I created a file under /lib/systemd/system/ called: ttyS0.service it has permissions of 644 as such: -rw-r--r-- 1 root root 152 Nov 17 11:33 ttyS0.service
This is what is in the file:
cat /lib/systemd/system/ttyS0.service
------------------------------------------------------------------
[Unit]
Description=Serial Console Service
[Service]
ExecStart=/sbin/getty -L 115200 ttyS0 vt102
Restart=always
[Install]
WantedBy=multi-user.target
------------------------------------------------------------------
After creating, saving, and setting the permissions, I then reloaded systemctl, enabled that service, and then started it:
sudo systemctl daemon-reload
sudo systemctl enable ttyS0
sudo systemctl start ttyS0
Then to be on the safe side, I rebooted the server and made sure it came up automatically on bootup.
You can then use any terminal program with a serial cable to connect to the command line of your server.
There are many solutions showing you how to use getty to do this, but the real problem I had was getting it to startup automatically on boot up because of the upstart to systemd change in the newer version of Ubuntu. That is why I am posting this, in case others had the same frustrations..
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the serial console being a USB to Serial converter i.e. ttyUSB0?
First of all, let's assume that you have already connected the serial port of your Linux box to a switch console port via a serial cable. To connect a Linux terminal to the serial port of your Linux system, you can use a command-line screen manager tool called screen. Install screen on Linux. To install screen on Debian, Ubuntu or Linux Mint. On Windows, COM ports are named COM1 through COM256. On Linux, serial devices can have arbitrary names but are typically character devices with a major number of 4 and a minor number from 64 to 256 represented by /dev/ttyS0 through /dev/ttyS191. By default init will populate this mapping using the mknod system call. I need to disable and then enable a serial port for testing purposes on a Java program. Since the man page of setserial is stating: 'Using UART type none will disable the port.' , I use sudo setserial /dev/ttyS4 uart none to disable the port. This successfully disables the serial port.
There are many examples of setting up serial and standard consoles for CentOS versions prior to
version 7, and none that I have been able to find using ttyUSB0 as the serial port. They have
all referenced ttyS0 or S1, S2 or S3. Not to mention that most show using grub not grub2 which
is what CentOS 7 uses.
I have an application that will need both standard console and a serial console. Unfortunately
my server does not and cannot have a standard serial port added to it. It is a Intel NUC
which does not allow for adding comports to.
I have been able to connect the USB to Serial converter to my NUC server and test it.
I have used 'screen /dev/ttyUSB0 115200n8' and use a crossover cable between the USB to Serial
Ubuntu Grub Serial Console
converter on the NUC to a PC running PuTTy and am able to send characters back and forth betweenthe two without issues.
Linux Serial Console
I am running CentOS Linux 7.1.1503 (Core) x86_64