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  1. RHEL
  2. RHEL-32885

[AWS] set the ttyS0 as primary console in RHEL AMIs

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      What were you trying to do that didn't work?

      Current RHEL AMIs has two console parameters 'console=ttyS0,115200n8 console=tty0', which set tty0 as primary console. So we have less information printed than RHEL guest image, Amazon Linux and Ubuntu during boot. To keep this setting consistent with rhel guest image and make it more useful for boot debug, I am suggesting set ttyS0 as primary console.

      // RHEL-9.4 Beta AMIs
# cat /proc/cmdline 
BOOT_IMAGE=(hd0,gpt3)/vmlinuz-5.14.0-427.el9.x86_64 root=UUID=f9e543b4-c517-4c6b-98ae-948c023183ef console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.blacklist=nouveau nvme_core.io_timeout=4294967295 crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M
//RHEL guest image
# cat /etc/default/grub
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200n8 no_timer_check net.ifnames=0 crashkernel=auto"
//Ubuntu 22.04
# cat /proc/cmdline 
BOOT_IMAGE=/boot/vmlinuz-6.5.0-1014-aws root=PARTUUID=a21bf548-7951-497e-9d37-d52953e74c21 ro console=tty1 console=ttyS0 nvme_core.io_timeout=4294967295 panic=-1
//Amazon Linux
$ cat /proc/cmdline 
BOOT_IMAGE=(hd0,gpt1)/boot/vmlinuz-6.1.82-99.168.amzn2023.x86_64 root=UUID=3d668946-b9eb-4d6b-acbd-da437d796ee8 ro console=tty0 console=ttyS0,115200n8 nvme_core.io_timeout=4294967295 rd.emergency=poweroff rd.shell=0 selinux=1 security=selinux quie

      Reference: https://access.redhat.com/articles/3166931

      Please provide the package NVR for which bug is seen:

      RHEL-9.4.0_HVM_BETA-20240411-x86_64-30-Access2-GP3

      How reproducible:

      Steps to reproduce

      1.  Launch a RHEL AMI on aws
      2.  Check the console output during boot.

      Expected results

      More information printed when console connected.

      Actual results

      Few messages printed now.

              thozza@redhat.com Tomas Hozza
              xiliang@redhat.com Frank Liang
              Osbuilders Bot Account Osbuilders Bot Account
              Release Test Team Release Test Team
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                Created:
                Updated:
                Resolved: