Mailinglist Archive: opensuse-factory (710 mails)

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Re: [opensuse-project] Re: [opensuse-factory] The road to systemd for openSUSE 12.1
  • From: Kay Sievers <kay.sievers@xxxxxxx>
  • Date: Fri, 17 Jun 2011 12:36:20 +0200
  • Message-id: <1308306982.1379.22.camel@mop>
On Fri, 2011-06-17 at 12:22 +0200, Dr. Werner Fink wrote:
On Fri, Jun 17, 2011 at 12:13:45PM +0200, Kay Sievers wrote:

Sure, they will just need an initramfs that can do that, if they want it
to work in the future.

Actually, the long-term goal is to merge the useless split of / and /usr
back to /usr and be able to mount /usr ro on every system. It's the same
model as Android is doing with /system.

/usr will contain the entire system, and only /etc and /var will be
host-specific. /usr can be ro and be shared between many machines of the
same architecture. But all logic to set it up before init starts will be
in in the initramfs. People are actually already working on it.

It has to possible to boot the system into single user mode
maintenance without mounted partitions.

Sure, the initramfs can drop you to the rescue shell right before init
would be started. It can do that already today.

Also the initramfs image creator will create a specific rescue image on
every box at install time, that can be used when things go wrong at the
level before the system is available.

The picture is a bit like /boot, and the rescue image, will no longer be
owned and constantly updated by the distro, but owned by the box they
are installed on.

I've no problem if this is done in initramfs just as a
rescue mode even before mounting the root file system
but for /usr this is a hard requirement for every big
data server. Be aware that a s390x / and most ppc64 are
not a smart phones nor net books.

They just don't fit into the pocket. :)

But today there is probably more to learn from the phones than from the
big boxes regarding the simplicity and reliability of the system layout
and update management.

They have proper read-only mounts, a single system partition, a rescue
partition, a strict split between system-, host-, user-, 3rd-party-app,
cache-data by default.

We really need to get closer to how they work, and the mindless split
between / and /usr is the first step to clean up the mess we inherited.


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