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On Wed, Aug 6, 2014 at 2:05 PM, Juerg Haefliger <juergh at gmail.com> wrote:

> Hi,
>
>
> On Wed, Aug 6, 2014 at 4:35 AM, sylecn <sylecn at gmail.com> wrote:
> >
> > Hi stackers,
> >
> > I have come across this problem of growpart/resizefs not working with
> CentOS 6.5 Cloud image on first boot.
>
> Which kernel version are you running in the guest?
>
>
>
> > Here is the relevant config in cloud.cfg
> > ==============================
> >
> > growpart:
> >   mode: auto
> >   devices: ["/"]
> > resize_rootfs: True
> > resize_rootfs_tmp: /dev
> >
> > cloud_init_modules:
> >  - bootcmd
> >  - write-files
> >  - growpart
> >  - resizefs
>
> Growpart called by cloud-init only works for kernels >3.8. Only newer
> kernels support changing the partition size of a mounted partition. When
> using an older kernel the resizing of the root partition happens in the
> initrd stage before the root partition is mounted and the subsequent
> cloud-init growpart run is a no-op.
>
>
> > Here is the relevant log on first boot:
> > ============================
> > [CLOUDINIT] helpers.py[DEBUG]: Running config-growpart using lock
> (<cloudinit.helpers.DummyLock object at 0x1ed06d0>)
> > [CLOUDINIT] util.py[DEBUG]: Running command ['growpart', '--help'] with
> allowed return codes [0] (shell=False, capture=True)
> > [CLOUDINIT] util.py[DEBUG]: Reading from /proc/1108/mountinfo
> (quiet=False)
> > [CLOUDINIT] util.py[DEBUG]: Read 521 bytes from /proc/1108/mountinfo
> > [CLOUDINIT] util.py[DEBUG]: Reading from /sys/class/block/vda1/partition
> (quiet=False)
> > [CLOUDINIT] util.py[DEBUG]: Read 2 bytes from
> /sys/class/block/vda1/partition
> > [CLOUDINIT] util.py[DEBUG]: Reading from
> /sys/devices/pci0000:00/0000:00:05.0/virtio2/block/vda/dev (quiet=False)
> > [CLOUDINIT] util.py[DEBUG]: Read 6 bytes from
> /sys/devices/pci0000:00/0000:00:05.0/virtio2/block/vda/dev
> > [CLOUDINIT] util.py[DEBUG]: Running command ['growpart', '--dry-run',
> '/dev/vda', '1'] with allowed return codes [0] (shell=False, capture=True)
> > [CLOUDINIT] util.py[DEBUG]: Running command ['growpart', '/dev/vda',
> '1'] with allowed return codes [0] (shell=False, capture=True)
> > [CLOUDINIT] util.py[DEBUG]: resize_devices took 0.076 seconds
> > [CLOUDINIT] cc_growpart.py[DEBUG]: '/' NOCHANGE: no change necessary
> (/dev/vda, 1)
> > [CLOUDINIT] helpers.py[DEBUG]: Running config-resizefs using lock
> (<cloudinit.helpers.DummyLock object at 0x1ed08d0>)
> > [CLOUDINIT] util.py[DEBUG]: Reading from /proc/1108/mountinfo
> (quiet=False)
> > [CLOUDINIT] util.py[DEBUG]: Read 521 bytes from /proc/1108/mountinfo
> > [CLOUDINIT] cc_resizefs.py[DEBUG]: resize_info: dev=/dev/vda1
> mnt_point=/ path=/
> > [CLOUDINIT] cc_resizefs.py[DEBUG]: Resizing / (ext4) using resize2fs
> /dev/vda1
> > [CLOUDINIT] util.py[DEBUG]: Running command ('resize2fs', '/dev/vda1')
> with allowed return codes [0] (shell=False, capture=True)
> > [CLOUDINIT] util.py[DEBUG]: Resizing took 0.004 seconds
> >
> > In the base image, I have upgraded cloud-init to 0.7.4-1.el6, and
> installed cloud-utils, cloud-initramfs-tools. After the first *reboot*,
> growpart/resizefs does their job and the root file system is grown to disk
> size.
>
> There is no cloud-initramfs-tools package for CentOS. You need
> cloud-utils-growpart and dracut-modules-growroot from EPEL6 for the initrd
> based partition resizing.
>
>
> > After a reboot, the relevant cloud-init logs:
> > ===================================
> > cc_growpart.py[DEBUG]: '/' NOCHANGE: no change necessary (/dev/vda, 1)
> > util.py[DEBUG]: Resizing took 13.776 seconds
> > cc_resizefs.py[DEBUG]: Resized root filesystem (type=ext4, val=True)
>
> These are log messages from cloud-init's growpart run. Can you post the
> boot messages from initrd growpart?
>
>
> ...Juerg
>
> Hi Juerg,

I didn't know about initrd based growpart. I see both cloud-utils-growpart
and dracut-modules-growroot are installed in the base image (via yum info).
Do I need any config on kernel modules or build a special initrd to make
growpart work on first boot?
I didn't see growpart message in dmesg and kernel syslog (/var/log/messages
on the guest) in first boot and 2nd boot.
/var/log/boot.log also has no information on that. Where can I get the boot
message from initrd growpart?

guest kernel: 2.6.32-431.3.1.el6.x86_64

package version:
Installed Packages
Name        : cloud-utils-growpart
Arch        : x86_64
Version     : 0.27
Release     : 10.el6
Size        : 53 k
Repo        : installed
>From repo   : epel
Summary     : Script for growing a partition
URL         :
https://launchpad.net/cloud-utils/trunk/0.27/+download/cloud-utils-0.27.tar.gz
License     : GPLv3
Description : This package provides the growpart script for growing a
partition. It is
            : primarily used in cloud images in conjunction with the
dracut-modules-growroot
            : package to grow the root partition on first boot.

Name        : dracut-modules-growroot
Arch        : noarch
Version     : 0.20
Release     : 2.el6
Size        : 43 k
Repo        : installed
>From repo   : epel
Summary     : Automatically resize the root partition on first boot
URL         :
https://launchpad.net/ubuntu/saucy/+source/cloud-initramfs-tools/0.20ubuntu1/+files/cloud-initramfs-tools_0.20ubuntu1.tar.gz
License     : GPLv3
Description : This dracut module will re-write the partition table of a
disk so that the
            : root partition has as much space as possible, bumping it up
to the edge of the
            : disk, or the edge of the next partition.

growpart and resize still happens on 2nd boot, not first boot.

-- 
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--
Thanks,
Yuanle
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