[systemd-devel] Prerequisites for systemd.volatile=yes

[Shreenidhi Shedi]

Hi All,

I'm trying to use volatile root feature for the first time.

This is my /etc/fstab:
```
#system mnt-pt type options dump fsck
PARTUUID=ad7ab716-2c0a-4dbe-9a28-06dc8bd0383b / ext4
defaults,barrier,noatime,data=ordered 1 1
```

And systemd grub configs are:
systemd_cmdline=net.ifnames=0 plymouth.enable=0
systemd.unified_cgroup_hierarchy=yes systemd.volatile=yes

Finally, kernel command is:
BOOT_IMAGE=/vmlinuz-6.1.83-1.ph5
root=PARTUUID=ad7ab716-2c0a-4dbe-9a28-06dc8bd0383b init=/lib/systemd/systemd
ro loglevel=3 quiet net.ifnames=0 plymouth.enable=0
systemd.unified_cgroup_hierarchy=yes systemd.volatile=yes

And I regenerated initrd using `mkinitrd`

But when I rebooted my vm, it is going to emergency shell and shows
/run/initramfs/rdsosreport.txt and I'm not able to get into emergency shell
either, it just keeps looping in press Ctrl-D or enter root password prompt
and entering root password or pressing Ctrl-D just prompts the same thing
again.

Can someone assist me on what are the prerequisites for enabling volatile
root?

- Kernel configs to be enabled
- File system types supported
- Kernel command line args needed

If someone can provide a step by step procedure on how to see this feature
in action, it would really help.

--
Shedi
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