On Fri, 21 Jun 2013 09:27:44 -0500 Serge Hallyn <serge.hal...@ubuntu.com> wrote:
> Quoting Leonid Isaev (lis...@umail.iu.edu): > > Hi, > > > > I have recently installed vanilla lxc-0.9.0 under archlinux and > > encountered the old "fs is remounted ro" issue which is supposed to be > > fixed since https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/942325 ... > > The (also archlinux) containers' rootfs are located on a separate > > partition mounted at /var/lib/lxc > > ---------- > > $ mount | grep lxc > > /dev/sda3 on /var/lib/lxc type ext4(rw,nosuid,nodev,relatime,data=ordered) > > ---------- > > The rootfs.hold file is open, according to strace run against lxc-start, > > e.g.: ---------- > > $ grep hold /var/log/lxc.strace.log > > open("/var/lib/lxc/arch-LXC-test/rootfs.hold", O_RDWR|O_CREAT, 0600) = 13 > > ---------- > > > > Nevertheless, whenever I shutdown the container via lxc-stop, > > the /var/lib/lxc partition is marked ro... What can I do to determine > > what's going wrong? > > what fs type are you using for /var/lib/lxc? Just an ext4. > > I'd try: create a loopback fs with that fstype, mount it under /mnt2, > then run: > > #include <stdio.h> > #include <stdlib.h> > #include <fcntl.h> > > cat > holdopen.c << EOF > int main(int argc, char *argv[]) { > FILE *f = fopen(argv[1], "w"); > fprintf(f, "1022\n"); > fflush(f); > lockf(fileno(f), F_TLOCK, 0); > sleep(999); > } > EOF > > make holdopen > ./holdopen /mnt2/xxx > mount -o remount,ro /mnt2/xxx > > and see if it succeeds. Mount correctly fails saying the FS is busy... After looking at lxc source, I am very confused because pin_rootfs() in src/conf.c seems to do almost same thing. I've rebuilt lxc-0.9.0 locally instead of using the packaged one, but still shutting down the container gives a read-only FS. Can it be related to the fact that both host and guest run systemd? Also, please note that lxc-shutdown has no effect as systemd powers off on receiving SIGRTMIN+4 (this is configured via lxc.stopsignal by the lxc-archlinux template, so lxc-stop gracefully shuts down the container). Thanks, Leonid. -- Leonid Isaev GnuPG key: 0x164B5A6D Fingerprint: C0DF 20D0 C075 C3F1 E1BE 775A A7AE F6CB 164B 5A6D
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