Red Hat Linux 串口配置

Posted by: JiaLiang Liao 4 years, 11 months ago

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在将VMware虚拟机导入Oracle Cloud时，为了debug需要在虚拟机上开启串口。

RHEL 4/5

This is achieved by adding the following line co:2345:respawn:/sbin/agetty ttyS0 115200 vt100 to the /etc/inittab file

# Run gettys in standard runlevels
1:2345:respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty tty2
3:2345:respawn:/sbin/mingetty tty3
4:2345:respawn:/sbin/mingetty tty4
5:2345:respawn:/sbin/mingetty tty5
6:2345:respawn:/sbin/mingetty tty6
co:2345:respawn:/sbin/agetty ttyS0 115200 vt100

After this edit is made, run the following command:

# init q

RHEL 6

To start agetty on a serial port that is not the primary console, create a new /etc/init/serial-ttyS0.conf file with the following contents:

start on stopped rc RUNLEVEL=[2345]
stop on runlevel [S016]

respawn
exec /sbin/agetty /dev/ttyS0 115200 vt100-nav

To check the status of the serial console, use the initctl command to query the init daemon's jobs:

[root@localhost ~]# initctl list | grep serial
serial (ttyS0) start/running, process 1254

RHEL 7

Add, or update if already present, the following lines to /etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200n8"
GRUB_TERMINAL="console serial"
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"

Rebuild the /boot/grub2/grub.cfg file by running the grub2-mkconfig -o command as follows:

• On BIOS-based machines: ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
• On UEFI-based machines: ~]# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg

RHEL 8

Use the grub2-env command to modify the boot parameters persistently.

# grub2-editenv - list | grep kernelopts
kernelopts=root=/dev/mapper/rhel-root ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap

Copy the kernelopts line above completely.
Set the new kernel options by pasting the original options and appending the new ones like so:

# grub2-editenv - set "kernelopts=root=/dev/mapper/rhel-root ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap console=ttyS0,115200 console=tty0"

Check to see if the parameters were set properly:

# grub2-editenv - list | grep kernelopts
kernelopts=root=/dev/mapper/rhel-root ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap console=ttyS0,115200 console=tty0

Reboot

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