How to configure serial getty with systemd

Solution Verified - Updated

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7

Issue

  • How to configure a serial getty with custom parameters in RHEL 7 so that it starts on boot

Resolution

  • First copy the template:

    # cp /usr/lib/systemd/system/serial-getty@.service /etc/systemd/system/serial-getty@ttyS0.service

  • Then edit the file and modify the agetty line:

    [Service]
ExecStart=-/sbin/agetty --keep-baud 115200,38400,9600 %I $TERM    <-- Change this parameter
Type=idle

  • Reload the daemon and start the service:

    # systemctl enable serial-getty@ttyS0.service
# systemctl start serial-getty@ttyS0.service
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