Hello Michal, SK, Alan,

It seems that there is away to achieve adding extra kernel parameters for machines. I am running MAAS 3.5 and I can do the following:

1. set kernel_opts configuration option to include "initrd=boot-initrd". e.g., `maas admin maas set-config name=kernel_opts value="initrd=boot-initrd"`
2. Commission the machine
3. Create a tag with kernel_opts: e.g., `maas admin tags create name=bug-tag kernel_opts="initrd=boot-initrd"`
4. Tag the machine with it. e.g., `maas admin tag update-nodes bug-tag add=$(maas admin machines read hostname=bug-machine | jq -r .[].system_id)`
5. unset the kernel_opts config option. e.g., `maas admin maas set-config name=kernel_opts value=`

The config option is required if machine is not already present in MAAS, since tag can be added to an existing machine. When the machine is enlisted, the config option can be replaced with a tag, or you can leave it set but it will be applied for all the machines in your MAAS deployment. So the usage of tag is preferred.

At my local dev MAAS I was able to construct the command line which includes the extra option:

```
ubuntu@maas-dev:~$ maas admin maas set-config name=kernel_opts value="initrd=boot-initrd"
Success.
Machine-readable output follows:
OK

ubuntu@maas-dev:~$ curl http://10.20.0.2:5248/ipxe.cfg-default-amd64
#!ipxe
kernel http://10.20.0.2:5248/images/39c00a8723ac5804c60f020feccec09b364947ca33be2347f84ea1ced0e9bbf8/ubuntu/amd64/ga-22.04/jammy/stable/boot-kernel
imgargs boot-kernel nomodeset root=squash:http://10.20.0.2:5248/images/574b060f461da7f5b281e04f345704c12b8ab1f19f49ef0f23e33e7b0dbac466/ubuntu/amd64/ga-22.04/jammy/stable/squashfs ip=::::maas-enlist:BOOTIF ip6=off cc:{'datasource_list': ['MAAS']}end_cc cloud-config-url=http://10-20-0-0--24.maas-internal:5248/MAAS/metadata/latest/enlist-preseed/?op=get_enlist_preseed ro overlayroot=tmpfs overlayroot_cfgdisk=disabled log_host=10.20.0.2 log_port=5247 --- initrd=boot-initrd BOOTIF=01-${mac}
initrd http://10.20.0.2:5248/images/ebab7ce82091c161eade87df88ae6c1829b1af0b62097fe6423cdb2ecd74cab3/ubuntu/amd64/ga-22.04/jammy/stable/boot-initrd
boot

ubuntu@maas-dev:~$ maas admin maas set-config name=kernel_opts value=
Success.
Machine-readable output follows:
OK

ubuntu@maas-dev:~$ curl http://10.20.0.2:5248/ipxe.cfg-default-amd64
#!ipxe
kernel http://10.20.0.2:5248/images/39c00a8723ac5804c60f020feccec09b364947ca33be2347f84ea1ced0e9bbf8/ubuntu/amd64/ga-22.04/jammy/stable/boot-kernel
imgargs boot-kernel nomodeset root=squash:http://10.20.0.2:5248/images/574b060f461da7f5b281e04f345704c12b8ab1f19f49ef0f23e33e7b0dbac466/ubuntu/amd64/ga-22.04/jammy/stable/squashfs ip=::::maas-enlist:BOOTIF ip6=off cc:{'datasource_list': ['MAAS']}end_cc cloud-config-url=http://10-20-0-0--24.maas-internal:5248/MAAS/metadata/latest/enlist-preseed/?op=get_enlist_preseed ro overlayroot=tmpfs overlayroot_cfgdisk=disabled log_host=10.20.0.2 log_port=5247 BOOTIF=01-${mac}
initrd http://10.20.0.2:5248/images/ebab7ce82091c161eade87df88ae6c1829b1af0b62097fe6423cdb2ecd74cab3/ubuntu/amd64/ga-22.04/jammy/stable/boot-initrd
boot
```

@Michal can you give it a try and let me know if you were able to commission the machines?

Thanks,
Stamatis