using label in grub2

[NK]

Hello,

I have issue with grub2 label setting , I want to  configure grub lable(not UUID) , I made following changes in config.xml but image generated with device name(not using lable)

-----config.xml---------------

<type image="vmx" filesystem="ext4" format="qcow2" kernelcmdline='root=LABEL=ROOT console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0' bootloader="grub2" devicepersistency='by-label'>

----------------------

But when I check the vm created from the image it doesnot show by lable.. (it use device name) 

------------

 #cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-4.18.0-348.20.1.el8_5.x86_64 root=/dev/vda1 ro

------------------

Tried with  kiwi version 9.23.23, 9.23.29 and 9.23.30

OS - Oracle Linux 8 

Thanks in Advance,

\

NK

[Robert Schweikert]

On 4/26/22 06:49, NK wrote:
>
> Hello,
>
> I have issue with grub2 label setting , I want to configure grub lable(not
> UUID) , I made following changes in config.xml but image generated with
> device name(not using lable)
>
> -----config.xml---------------
> <type image="vmx" filesystem="ext4" format="qcow2"
> kernelcmdline='root=LABEL=ROOT console=ttyS0,115200n8 console=tty0
> net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0'
> bootloader="grub2" devicepersistency='by-label'>

drop "root=LABEL=ROOT", kiwi generates this when
'devicepersistency="by-label"' is set

> ----------------------
> But when I check the vm created from the image it doesnot show by lable..
> (it use device name)
> ------------
> #cat /proc/cmdline
> BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-4.18.0-348.20.1.el8_5.x86_64
> root=/dev/vda1 ro
> ------------------
> Tried with kiwi version 9.23.23, 9.23.29 and 9.23.30
>
> OS - Oracle Linux 8
>
>
> Thanks in Advance,
> \
> NK
>

--
Robert Schweikert MAY THE SOURCE BE WITH YOU
Distinguished Engineer LINUX
Technical Team Lead Public Cloud
rjsc...@suse.com
IRC: robjo

[Nikunj]

Hi,

Thanks for quick response,

Still no luck 

I dropped ROOT Label as below

<type image="vmx" filesystem="ext4" format="qcow2" kernelcmdline='console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0' bootloader="grub2" devicepersistency='by-label'>

after making changes new image has same device name 

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With Regards,

Nikunj Khakhar

[Marcus Schäfer]

Hi,

> Still no luck
> I dropped ROOT Label as below
> <type image="vmx" filesystem="ext4" format="qcow2"
> kernelcmdline='console=ttyS0,115200n8 console=tty0 net.ifnames=0
> rd.driver.blacklist=nouveau nouveau.modeset=0' bootloader="grub2"
> devicepersistency='by-label'>
> after making changes new image has same device name

> image.png

According to your picture the kernel cmdline has

root=/dev/vda1

kiwi does not create a root= reference of a specific device name
unless it is told to do it via kernelcmdline. I wonder where this
should come from.

Are you sure there is nothing in your image description which
explicitly sets a root device ?

If you can share your complete image description (not only the XML file)
we can take a look as well.

Thanks

Regards,
Marcus
--
Public Key available via: https://keybase.io/marcus_schaefer/key.asc
keybase search marcus_schaefer
-------------------------------------------------------
Marcus Schäfer Brunnenweg 18
Tel: +49 7562 905437 D-88260 Argenbühl
Germany
-------------------------------------------------------

[NK]

Hi,

No there is nothing in image description file for root device

config xml snapshot is as below, let me know if you need any other part from config.xml file

------------------------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>

  <image schemaversion="6.9" name="OL_8" displayname="Oracle_8">
      <description type="system">
        <specification>OracleLinux_8</specification>
  </description>
        <preferences>
          <version>1.0.0</version>
          <packagemanager>dnf</packagemanager>
          <bootsplash-theme>charge</bootsplash-theme>
          <locale>en_US</locale>
          <keytable>us</keytable>
          <timezone>UTC</timezone>
          <rpm-check-signatures>false</rpm-check-signatures>
       <type image="vmx" filesystem="ext4" format="qcow2" kernelcmdline="console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0" devicepersistency="by-label">
        <bootloader name="grub2" timeout="1"/>
           <size unit="G">6</size>
          </type>
  </preferences>

----------------------------------------------------------------

[Robert Schweikert]

Hi,

What's the grub version in OL 8, it could be that the settings that kiwi
generates, i.e.

GRUB_ENABLE_LINUX_LABEL=true
GRUB_DISABLE_LINUX_UUID=true

in /etc/default/grub get ignored. Could also be that there are scripts
in OL 8 that force the setting of the device as root. These scripts
would most likely be in

/etc/dracut.conf.d/

What are the settings in /etc/default/grub?

Later,
Robert

>> Tel: +49 7562 905437 <+49%207562%20905437> D-88260 Argenbühl
>> Germany
>> -------------------------------------------------------

[Marcus Schäfer]

Hi,

> No there is nothing in image description file for root device

I did a quick build of an image using by-label persistency and you
should see something like the following in your build log:

INFO: 19:27:27 | Writing grub2 defaults file
INFO: 19:27:27 | --> GRUB_CMDLINE_LINUX:"root=LABEL=ROOT"
INFO: 19:27:27 | --> GRUB_DISABLE_LINUX_UUID:true
INFO: 19:27:27 | --> GRUB_ENABLE_LINUX_LABEL:true
INFO: 19:27:27 | Writing sysconfig bootloader file
INFO: 19:27:27 | --> DEFAULT_APPEND:"selinux=targeted root=LABEL=ROOT "
INFO: 19:27:27 | --> FAILSAFE_APPEND:"selinux=targeted root=LABEL=ROOT ide=nodma apm=off noresume edd=off nomodeset 3 "

If you don't see that please update kiwi from here:

http://download.opensuse.org/repositories/Virtualization:/Appliances:/Builder/

In my test label boot worked

Hope this helps

[NK]

Hi,

Thanks for Solution!! 

When I tried with Kiwi 9.24.31 it worked well  but when I checked the /proc/cmdline , it has included root=LABEL=ROOT but it did not remove device name (/dev/vda1).

# cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-4.18.0-348.20.1.el8_5.x86_64 root=/dev/vda1 ro root=LABEL=ROOT console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0
#

But when I used version Kiwi 9.24.32 it worked well and device name disappeared .

 sudo cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-4.18.0-348.20.1.el8_5.x86_64 console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0 root=LABEL=ROOT

config.xml ..

   <type image="vmx" filesystem="ext4" format="qcow2" kernelcmdline="console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0" bootloader="grub2" devicepersistency="by-label">

logs -- 

14:54:50  [ INFO    ]: 12:54:40 | Writing grub2 defaults file
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_CMDLINE_LINUX:"root=LABEL=ROOT"
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_CMDLINE_LINUX_DEFAULT:"console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0"
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_DISABLE_LINUX_UUID:true
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_DISTRIBUTOR:"OTC_Oracle_8"
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_ENABLE_BLSCFG:true
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_ENABLE_LINUX_LABEL:true
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_GFXMODE:auto
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_TERMINAL:"gfxterm"
14:54:50  [ INFO    ]: 12:54:40 | --> GRUB_TIMEOUT:10
14:54:50  [ INFO    ]: 12:54:40 | --> SUSE_REMOVE_LINUX_ROOT_PARAM:true
14:54:50  [ INFO    ]: 12:54:40 | Writing sysconfig bootloader file
14:54:50  [ INFO    ]: 12:54:40 | --> DEFAULT_APPEND:"console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0 root=LABEL=ROOT "
14:54:50  [ INFO    ]: 12:54:40 | --> FAILSAFE_APPEND:"console=ttyS0,115200n8 console=tty0 net.ifnames=0 rd.driver.blacklist=nouveau nouveau.modeset=0 root=LABEL=ROOT  ide=nodma apm=off noresume edd=off nomodeset 3 "
14:54:50  [ INFO    ]: 12:54:40 | --> LOADER_LOCATION:mbr
14:54:50  [ INFO    ]: 12:54:40 | --> LOADER_TYPE:grub2
14:54:50  [ INFO    ]: 12:54:40 | Creating config.bootoptions
14:54:50  [ DEBUG   ]: 12:54:40 | EXEC: [blkid /dev/mapper/loop0p1 -s LABEL -o value]