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Creating a qcow2 image for RHEL

This section explains the qcow2 image creation for RHEL.

Precondition

Partition with RHEL-7.3 installed and root user access

Update boot loader

Go to /etc/zipl.conf and remove all occurrences of rd.zfcp=
Add a new rd.zfcp entry

rd.zfcp=ipldev
Empty /etc/zfcp.conf file

echo "" > /etc/zfcp.conf
Create the dasd.conf file # In order to avoid error messages related to dasd configuration

touch /etc/dasd.conf

Go to /usr/lib/dracut/modules.d/95zfcp/parse-zfcp.sh

Apply the following differences:

$ diff old_parse-zfcp.sh new_parse-zfcp.sh
8,9c8,10 < echo $zfcp_arg | grep '0\.[0-9a-fA-F]\.[0-9a-fA-F]\{4\},0x[0-9a-fA-F]\{16\},0x[0-9a-fA-F]\{16\}' >/dev/null
         < test $? -ne 0 && die "For argument 'rd.zfcp=$zfcp_arg'\nSorry, invalid format."
     --- > if [ "$zfcp_arg" == "ipldev" -a "$(cat /sys/firmware/ipl/ipl_type)" == "fcp" ] ; then
         > zfcp_arg="$(cat /sys/firmware/ipl/device),$(cat /sys/firmware/ipl/wwpn),$(cat /sys/firmware/ipl/lun)"
         > fi

The result should look like this:

#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh

getargbool 1 rd.zfcp.conf -d -n rd_NO_ZFCPCONF || rm /etc/zfcp.conf

for zfcp_arg in $(getargs rd.zfcp -d 'rd_ZFCP='); do
    if [ "$zfcp_arg" == "ipldev" -a "$(cat /sys/firmware/ipl/ipl_type)" == "fcp" ] ; then
        zfcp_arg="$(cat /sys/firmware/ipl/device),$(cat /sys/firmware/ipl/wwpn),$(cat /sys/firmware/ipl/lun)"
    fi
    (
       IFS=","
        set $zfcp_arg
        echo "$@" >> /etc/zfcp.conf
    )
done

zfcp_cio_free

Rebuild the ramdisk

dracut -f
To apply the above changes to the contents of boot loader script

zipl -V

Installation of Cloud-init

Install cloud-utils-growpart

This package is required for growing the filesystem.

Download a version of cloud-utils-growpart < 0.27.13

Note

Greater version can not deal with rhel7s old 'util-linux' package version

install it:

rpm -i cloud-utils-growpart-0.27-9.fc20.noarch.rpm

Add the RHEL7.3 yum repository

Add the yum repository file that points to a network resource

cat <<EOT > /etc/yum.repos.d/rhel.repo
[RHEL7.3]
name=Red Hat Enterprise Linux Repository
baseurl=https://x.x.x.x
enabled=1
gpgcheck=0
EOT

Install cloud-init 0.7.9

Download latest cloud-init from https://launchpad.net/cloud-init/+download

Install python setuptools

yum install python-setuptools

Extract it

tar -xf cloud-init-0.7.9.tar.gz

Enter the extracted directory

cd cloud-init-0.7.9

Build and install it:

python setup.py build

python setup.py install --init-system systemd

Update cloud-init service files

Remove Default dependencies

sed -i '/^\[Unit\]$/,/^\[/ s/^DefaultDependencies=no/#DefaultDependencies=no/' /usr/lib/systemd/system/cloud-init.service

sed -i '/^\[Unit\]$/,/^\[/ s/^DefaultDependencies=no/#DefaultDependencies=no/' /usr/lib/systemd/system/cloud-init-local.service

Remove ordering for sysinit.target

sed -i '/^\[Unit\]$/,/^\[/ s/^Before=sysinit.target/#Before=sysinit.target/' /usr/lib/systemd/system/cloud-init.service

sed -i '/^\[Unit\]$/,/^\[/ s/^Before=sysinit.target/#Before=sysinit.target/' /usr/lib/systemd/system/cloud-init-local.service

order with systemd-hostnamed.service

sed -i '/^\[Unit\]$/,/^\[/ s/^After=networking.service/After=networking.service\nAfter=systemd-hostnamed.service/' /usr/lib/systemd/system/cloud-init.service

The result should look like this:

cat /usr/lib/systemd/system/cloud-init.service

cat /usr/lib/systemd/system/cloud-init-local.service

Configure cloud-init for autostart

systemctl daemon-reload

systemctl enable cloud-init.service

systemctl enable cloud-init-local.service

systemctl enable cloud-final.service

systemctl enable cloud-config.service

Use the following cloud.cfg file

Keep this cloud.cfg file in /etc/cloud/

Test-It

Run it once to see if things are working

cloud-init --init

Note

This might take a few minutes, as cloud-init tries to access various network datasources, which probably are not available in your image build environment.But they should be available in your OpenStack cloud. For debugging you might need to set "datasource_list: [ ConfigDrive, None ]" in cloud.cfg. This excludes those network data sources and boot is pretty fast.

Add DPM-Guest Tools

Install git and clone nova-dpm repository into the guest image.

git clone https://github.com/openstack/nova-dpm.git

Copy the following files from nova-dpm directory into the guest image

cp nova-dpm/guest_image_tools/usr/bin/autoconfigure_networking.sh  /usr/bin/autoconfigure_networking.sh

cp nova-dpm/guest_image_tools/usr/lib/systemd/system/autoconfigure_networking.service  /usr/lib/systemd/system/autoconfigure_networking.service

cp nova-dpm/guest_image_tools/usr/bin/setmac.sh  /usr/bin/setmac.sh

cp nova-dpm/guest_image_tools/usr/bin/dpm_guest_image_tools_common  /usr/bin/

cp nova-dpm/guest_image_tools/etc/udev/rules.d/80-setmac.rules /etc/udev/rules.d/80-setmac.rules

Ensure permissions

chmod 644 /usr/lib/systemd/system/autoconfigure_networking.service
Enable the service for autostart

systemctl enable autoconfigure_networking.service

Cleanup

Cleanup logs and journalctl

rm -rf /var/log/*

Remove repo file and update repo

rm -f /etc/yum.repos.d/rhel.repo

yum clean all

yum update

yum repolist

Remove data from last cloud-init run

rm -rf /var/lib/cloud/*

Remove persistent mac address interface mappings

rm -f /etc/udev/rules.d/70-persistent-net.rules

Remove persistent network configs

rm -f /etc/sysconfig/network-scripts/ifcfg-enc*

Clear /etc/hostname

echo "" > /etc/hostname
Cleanup home directory

rm -rf ~/*

Create qcow2 image

In order to nullify space

dd if=/dev/zero of=~/tmpfile

rm -rf ~/tmpfile
Now stop the partition and access the LUN used for image creation from other machine
copy disk content byte-by-byte into a raw image

dd status=progress if=/path/to/installed/lun of=RHEL.img
Convert this raw image to qcow

qemu-img convert -f raw -O qcow2 RHEL.img RHEL.qcow

Test qcow2 image

Deploy this image on another LUN

qemu-img convert RHEL.qcow /path/to/new/lun
Use this new LUN to boot the machine

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