[Rdo-list] Automatic resizing of root partitions in RDO Icehouse
St. George, Allan L.
ALLAN.L.ST.GEORGE at leidos.com
Fri May 9 13:04:56 UTC 2014
I'm sure someone could make this better, but this is what I've been using and it works well:
V/R,
Allan
1. Create disk image with QCOW2 format
qemu-img create -f qcow2 /tmp/centos-6.5-working.qcow2 10G
2. Install CentOS; Install onto a single ext4 partition mounted to “/” (no /boot, /swap, etc.)
virt-install --virt-type {kvm or qemu} --name centos-6.5 --ram 1024 \
--cdrom=/tmp/CentOS-6.5-x86_64-minimal.iso \
--disk /tmp/centos-6.5-working.qcow2,format=qcow2 \
--network network=default \
--graphics vnc,listen=0.0.0.0 --noautoconsole \
--os-type=linux --os-variant=rhel6
3. Eject the disk and reboot the virtual machine
virsh attach-disk --type cdrom --mode readonly centos-6.5 "" hdc
virsh destroy centos-6.5
virsh start centos-6.5
4. After reboot, login into your new image and modify '/etc/sysconfig/network-scripts/ifcfg-eth0' to look like this
DEVICE="eth0"
BOOTPROTO="dhcp"
NM_CONTROLLED="no"
ONBOOT="yes"
TYPE="Ethernet"
5. Add EPEL repository and update OS
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh https://yum.puppetlabs.com/el/6/products/x86_64/puppetlabs-release-6-7.noarch.rpm
6. Update yum and install cloud-init
yum -y update
yum install cloud-utils cloud-init parted git
cd /tmp
git clone https://github.com/flegmatik/linux-rootfs-resize.git (installed in place of cloud-initramfs-tools)
cd linux-rootfs-resize
./install
Edit /etc/cloud/cloud.cfg
Add the line:
user: ec2-user
Under “cloud_init_modules”, add:
- resolv-conf
7. Install and configure puppet
yum install puppet
edit /etc/hosts and add entry for foreman
edit /etc/puppet/puppet.conf and add the following lines:
[main]
pluginsync = true
[agent]
runinterval=1800
server = {server.domain}
chkconfig puppet on
8. Enable the instance to access the metadata service
echo "NOZEROCONF=yes" >> /etc/sysconfig/network
9. Configure /etc/ssh/sshd_config
Uncomment the following lines:
PermitRootLogin yes
PasswordAuthentication yes
10. Power down your virtual Centos machine
11. Clean up the virtual machine of MAC address, etc.
virt-sysprep -d centos-6.5
12. Undefine the libvirt domain
virsh undefine centos-6.5
13. Compress QCOW2 image with
qemu-img convert -c /tmp/centos-6.5-working.qcow2 -O qcow2 /tmp/centos.qcow2
Image /tmp/centos-6.5.qcow2 is now ready for upload to Openstack
-----Original Message-----
From: Kashyap Chamarthy [mailto:kchamart at redhat.com]
Sent: Wednesday, May 07, 2014 11:49 PM
To: St. George, Allan L.
Cc: rdo-list at redhat.com; Elías David
Subject: Re: [Rdo-list] Automatic resizing of root partitions in RDO Icehouse
On Wed, May 07, 2014 at 02:31:43PM +0000, St. George, Allan L. wrote:
> I haven’t had the time to work with Icehouse yet, but I have outlined
> instruction that are used to create Havana CentOS images that resize
> automatically upon spawning via linux-rootfs-resize.
>
> If interested, I’ll forward it along.
That'd be useful. It'd be even better if you could make a quick RDO wiki page[1] that'll be indexed by the search engines.
[1] http://openstack.redhat.com/
PS: If you're a Markdown user, you can convert Markdown -> WikiMedia (RDO uses WikiMedia for wiki) trivially like this:
$ pandoc -f markdown -t Mediawiki foo.md -o foo.wiki
>
> From: rdo-list-bounces at redhat.com [mailto:rdo-list-bounces at redhat.com]
> On Behalf Of Elías David Sent: Tuesday, May 06, 2014 12:57 PM To:
> Kashyap Chamarthy Cc: rdo-list at redhat.com Subject: Re: [Rdo-list]
> Automatic resizing of root partitions in RDO Icehouse
>
>
> Hi thanks for the answers!
>
> But how is the support right now in OpenStack with centos/fedora
> images regarding the auto resizing during boot? does the disk size set
> in the flavor is respected or not, or does it work only with fedora
> and newer kernels than what CentOS uses...things like that is what I'm
> looking for On May 6, 2014 4:09 AM, "Kashyap Chamarthy"
> <kchamart at redhat.com<mailto:kchamart at redhat.com>> wrote: On Mon, May
> 05, 2014 at 10:22:26PM -0430, Elías David wrote:
> > Hello all,
> >
> > I would like to know what's the current state of auto resizing the
> > root partition in current RDO Icehouse, more specifically, CentOS
> > and Fedora images.
> >
> > I've read many versions of the story so I'm not really sure what
> > works and what doesn't.
> >
> > For instance, I've read that currently, auto resizing of a CentOS
> > 6.5 image for would require the filesystem to be ext3 and I've also
> > read that auto resizing currently works only with kernels >= 3.8, so
> > what's really the deal with this currently?
> >
> > Also, it's as simple as having cloud-init, dracut-modules-growroot
> > and cloud-initramfs-tools installed on the image or are there any
> > other steps required for the auto resizing to work?
>
>
> I personally find[1] virt-resize (which works the same way on any
> images) very useful when I'd like to do resizing, as it works
> consistent well.
>
> I just tried on a Fedora 20 qcow2 cloud image with these below four
> commands and their complete output.
>
> 1. Examine the root filesystem size _inside_ the cloud image:
>
> $ virt-filesystems --long --all -h -a fedora-latest.x86_64.qcow2
>
> Name Type VFS Label MBR Size Parent /dev/sda1
> filesystem ext4 _/ - 1.9G - /dev/sda1 partition -
> - 83 1.9G /dev/sda /dev/sda device - - -
> 2.0G -
>
> 2. Create a new qcow2 disk of 10G:
>
> $ qemu-img create -f qcow2 -o preallocation=metadata \
> newdisk.qcow2 10G
>
> 3. Perform the resize operation:
>
> $ virt-resize --expand /dev/sda1 fedora-latest.x86_64.qcow2 \
> newdisk.qcow2 Examining fedora-latest.x86_64.qcow2 ... **********
>
> Summary of changes:
>
> /dev/sda1: This partition will be resized from 1.9G to 10.0G. The
> filesystem ext4 on /dev/sda1 will be expanded using the
> 'resize2fs' method.
>
> ********** Setting up initial partition table on newdisk.qcow2 ...
> Copying /dev/sda1 ... 100%
> ⟦▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒⟧
> 00:00 Expanding /dev/sda1 using the 'resize2fs' method ...
>
> Resize operation completed with no errors. Before deleting the
> old disk, carefully check that the resized disk boots and works
> correctly.
>
> 4. Examine the root file system size in the new disk (should reflect
> correctly):
>
> $ virt-filesystems --long --all -h -a newdisk.qcow2 Name
> Type VFS Label MBR Size Parent /dev/sda1 filesystem
> ext4 _/ - 10G - /dev/sda1 partition - - 83
> 10G /dev/sda /dev/sda device - - - 10G -
>
>
> Hope that helps.
>
>
> [1]
>
> http://kashyapc.com/2013/04/13/resize-a-fedora-19-guest-with-libguestf
> s-tools/
>
>
>
> -- /kashyap
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> Rdo-list mailing list
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--
/kashyap
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