Re: -o remount,ro /

From: Laurent Bercot <>
Date: Fri, 13 May 2016 17:38:15 +0200

On 13/05/2016 16:34, Eric Vidal wrote:
> i forgot :
> what puzzle me, if i do this in console (so i'm on tty1 just after the booting ) :
> mount -o remount,ro /
> all works fine without trouble

  Got it.

  When you run s6-rc, it takes a lock on the database.
  However, if the database is on a read-only filesystem, it cannot take the
lock (because it needs a writing fd for that), but ignores the error because
nothing is going to modify the database on a read-only filesystem anyway.

  If your stage 2 runs s6-rc while your / is rw, then it will take a lock on
the database; attempting to remount / ro in a script run by s6-rc will fail,
because that lock is preventing you from doing that.

  Just boot with your / ro already. s6-rc will not grab a lock and everything
will be fine. Note that if you then remount / rw and proceed to modify the
current compiled database while s6-rc is still running, you will be asking
for trouble, and pretty likely to get it.

Received on Fri May 13 2016 - 15:38:15 UTC

This archive was generated by hypermail 2.3.0 : Sun May 09 2021 - 19:38:49 UTC