On Fri, Jul 03, 2020 at 01:32:12PM +0000, Zbigniew Jędrzejewski-Szmek wrote: > On Fri, Jul 03, 2020 at 09:18:42AM -0400, Colin Walters wrote: > > On Thu, Jul 2, 2020, at 11:53 AM, Zbigniew Jędrzejewski-Szmek wrote: > > > > > It would be great if we could fairly reliably boot with a read-only > > > root file system, > > > > Eh, just mount a tmpfs for /var, and an overlayfs for /etc (backed by a tmpfs). > > I see that this thread is one massive communication failure on my part :( > > I wrote about "booting successfully with a read-only file system", but I > see that I didn't say "... when the disk cannot be mounted rw because of > file system errors". ...but Colin did not say that. Neither tmpfs nor overlayfs (backed by tmpfs) require any existing disk filesystems to be mounted read-write. TBH, that was my first thought when I read your original e-mail: "why would units fail if they only want to write non-persistent stuff to an area that may perfectly well be mounted as tmpfs, just as /run usually is?" > I thought it'd be clear from the context, but it's > clearly not. Anyway, while I'm a big fan of coreos and read-only-on-purpose, > I was writing about traditional systems in a read-only-by-accident scenario, > i.e. about the system behaving gracefully when the disk is ***unexpectedly*** > read-only. > > Zbyszek > > PS. OK, I know I wrote about making it read-only on purpose using a > kernel commandline option, so really we're just pretending it was > unexpected for testing purposes, but you get what I mean I hope. G'luck, Peter -- Peter Pentchev roam@xxxxxxxxxxx roam@xxxxxxxxxx pp@xxxxxxxxxxxx PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint 2EE7 A7A5 17FC 124C F115 C354 651E EFB0 2527 DF13
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