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Add note on grub required args #67

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Jan 12, 2022
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Add note on grub required args #67

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8 changes: 6 additions & 2 deletions content/en/docs/Customizing/configure_grub.md
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Original file line number Diff line number Diff line change
Expand Up @@ -56,14 +56,18 @@ if [ -n "$recoverylabel" ]; then
set kernelcmd="console=tty1 root=live:CDLABEL=$recoverylabel rd.live.dir=/ rd.live.squashimg=$img panic=5"
else
# Boot arguments when the image is used as active/passive
set kernelcmd="console=tty1 root=LABEL=$label iso-scan/filename=$img panic=5 security=selinux selinux=1"
set kernelcmd="console=tty1 root=LABEL=$label iso-scan/filename=$img panic=5 security=selinux rd.cos.oemlabel=COS_OEM selinux=1"
fi

set initramfs=/boot/initrd
```

You can tweak that file to suit your needs if you need to specify persistent boot arguments.

{{% alert title="Note" %}}
`rd.cos.oemlabel=COS_OEM` is required inside the bootargs in order to access to the `/oem` mount within the rootfs stage. `COS_OEM` is the default label for the oem partition.
{{% /alert %}}

## Grub environment variables

cOS (since v0.5.8) makes use of the GRUB2 environment block which can used to define
Expand Down Expand Up @@ -169,4 +173,4 @@ It is possible to override the default fallback logic by setting `default_fallba
> grub2-editenv /oem/grubenv set default_fallback="2 0 1"
```

Will set the default fallback to "2 0 1" instead of the default "0 1 2".
Will set the default fallback to "2 0 1" instead of the default "0 1 2".