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← Revision 39 as of 2021-12-31 14:57:50 ⇥
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| Once a template system has been installed, that system can be cloned. `virt-clone` will automatically change the MAC address of your network device. | |
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| Once a template system has been installed, that system can be cloned. `virt-clone` will automatically change the MAC address of your network device. Use the script below to clone your template. | == Cloning == Use the script below to clone your template. |
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| `clonedomain.sh` | `domain_clone_bullseye.sh` |
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| LVM_GROUP="vg2" NAME_ORIGINAL="stretch-template" LVM_NAME_ORIGINAL="kvm_${NAME_ORIGINAL}_vda" LVM_SIZE_ORIGINAL=`lvs /dev/${LVM_GROUP}/${LVM_NAME_ORIGINAL} -o LV_SIZE --noheadings --units B --nosuffix` NAME_CLONE="stretch-clone" LVM_NAME_CLONE="kvm_${NAME_CLONE}_vda" |
SRC_VOLUME_GROUP="vg_storage" DST_VOLUME_GROUP="vg_storage" SRC_NAME="bullseye-template" SRC_VOLUME="kvm_${SRC_NAME}_vda" SRC_VOLUME_SIZE=`lvs /dev/${SRC_VOLUME_GROUP}/${SRC_VOLUME} -o LV_SIZE --noheadings --units B --nosuffix` DST_NAME="bullseye-clone" DST_VOLUME="kvm_${DST_NAME}_vda" DST_MEMORY="256M" MOUNTPOINT="/mnt/domain_root" MAC="" if [ ! -e /sbin/kpartx ] then apt-get install -y kpartx fi |
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| NAME_CLONE=${1} LVM_NAME_CLONE="kvm_${NAME_CLONE}_vda" |
DST_NAME=${1} DST_VOLUME="kvm_${DST_NAME}_vda" |
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| if [ ! -e /dev/${LVM_GROUP}/${LVM_NAME_CLONE} ] | if [ "${2}" != "" ] |
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| # create lvm partition lvcreate --size ${LVM_SIZE_ORIGINAL}B --name ${LVM_NAME_CLONE} ${LVM_GROUP} |
MAC="--mac ${2} " else MAC=$(grep ${DST_NAME} /root/scripts/mac | awk -F "\t" {'print $1'}) MAC="--mac ${MAC}" fi |
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| # clone the domain virt-clone --original ${NAME_ORIGINAL} --name ${NAME_CLONE} --file /dev/${LVM_GROUP}/${LVM_NAME_CLONE} --check path_in_use=off,path_exists=off |
if [ ! -e /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} ] then # create lvm partition lvcreate --yes --size ${SRC_VOLUME_SIZE}B --name ${DST_VOLUME} ${DST_VOLUME_GROUP} # clone the domain virt-clone \ --original ${SRC_NAME} \ --name ${DST_NAME} \ --file /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} \ ${MAC} \ --check path_in_use=off,path_exists=off # mount the domains / partition OFFSET=`kpartx /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} | tail -n1|awk {'print $6'}` OFFSET_BYTES="$((${OFFSET} * 512))" losetup -o ${OFFSET_BYTES} /dev/loop0 /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} pvscan vgscan vgchange -ay vg_os if [ ! -e ${MOUNTPOINT} ] then mkdir -p ${MOUNTPOINT} fi mount -o subvol=@rootfs /dev/vg_os/root ${MOUNTPOINT} # manipulate domain mkdir ${MOUNTPOINT}/root/scripts cp /root/scripts/guest_cleanup.sh ${MOUNTPOINT}/root/scripts # hostname cp ${MOUNTPOINT}/etc/hosts ${MOUNTPOINT}/etc/hosts.kk sed -i "s/${SRC_NAME}/${DST_NAME}/g" ${MOUNTPOINT}/etc/hosts cp ${MOUNTPOINT}/etc/hostname ${MOUNTPOINT}/etc/hostname.kk sed -i "s/${SRC_NAME}/${DST_NAME}/g" ${MOUNTPOINT}/etc/hostname # rc.local echo "#!/bin/sh" > ${MOUNTPOINT}/etc/rc.local # this delay is needed for the network to settle, works with 32, but using 64 to be sure #echo "sleep 64" >> ${MOUNTPOINT}/etc/rc.local echo "/root/scripts/guest_cleanup.sh ${DST_NAME}" >> ${MOUNTPOINT}/etc/rc.local echo "rm /etc/rc.local" >> ${MOUNTPOINT}/etc/rc.local echo "shutdown -h 0" >> ${MOUNTPOINT}/etc/rc.local echo "exit 0" >> ${MOUNTPOINT}/etc/rc.local chmod +x ${MOUNTPOINT}/etc/rc.local # ssh keys mkdir ${MOUNTPOINT}/root/.ssh cat /root/scripts/login_id_rsa.pub >> ${MOUNTPOINT}/root/.ssh/authorized_keys mkdir ${MOUNTPOINT}/home/kale/.ssh cat /root/scripts/login_id_rsa.pub >> ${MOUNTPOINT}/home/kale/.ssh/authorized_keys chown -R kale:kale ${MOUNTPOINT}/home/kale/ # unmount and cleanup umount ${MOUNTPOINT} vgchange -an vg_os losetup -d /dev/loop0 # cleanup domain virt-xml ${DST_NAME} --edit --graphics password=${DST_NAME} #virt-xml ${DST_NAME} --remove-device --graphics all virsh setmaxmem ${DST_NAME} --size ${DST_MEMORY} --config virsh setmem ${DST_NAME} --size ${DST_MEMORY} --config virsh start ${DST_NAME} |
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| echo "${0}: refusing to overwrite existing domain" | echo "${0}: refusing to overwrite existing domain" |
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| == Cleaning up Your Clone == | === Cleaning up Guest OS on First Boot === Before using this script, notice that the root password is set to the hostname. Please make up your own method for setting the root password. Preferable it should be randomized and ssh keys should be used instead of knowing the password. `guest_cleanup.sh` {{{#!highlight bash #!/bin/sh NAME="" if [ $# -gt 0 ] then # the new hostname NAME=${1} # root password echo "root:${NAME}" | chpasswd # sshd rm /etc/ssh/ssh_host_* dpkg-reconfigure openssh-server systemctl restart sshd # extend filesystem size lvextend --size 3G /dev/vg_os/root btrfs filesystem resize max / # network cp /etc/default/grub /etc/default/grub.kk sed -i 's/GRUB_CMDLINE_LINUX=""/GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"/g' /etc/default/grub update-grub cp /etc/network/interfaces /etc/network/interfaces.kk sed -i 's/allow-hotplug enp1s0/allow-hotplug eth0/' /etc/network/interfaces sed -i 's/allow-hotplug eth0/#allow-hotplug eth0\nauto eth0/' /etc/network/interfaces sed -i 's/iface enp1s0 inet dhcp/iface eth0 inet dhcp/' /etc/network/interfaces # cleanup rm /root/scripts/guest_cleanup.sh rmdir /root/scripts shutdown -h 0 else echo ${0}: requires a hostname as parameter fi }}} === A List of Predefined MAC Adresses === `mac` {{{ #<mac><tab><hostname> # virtual devices for redundant setup 52:54:00:52:de:25 ns01 52:54:00:cf:5c:d3 ns02 52:54:00:65:0f:42 dhcp01 52:54:00:47:84:7d dhcp02 52:54:00:e0:0f:1d ntp01 52:54:00:b6:76:ee ntp02 # virtual devices for maintenance 52:54:00:94:a4:2e login }}} Make a clone. {{{ ./domain_clone_bullseye.sh clone }}} == Memory == Increase or decrease amount of memory by [[Domain Editing|editing the domain]]. == Network == For your convenience add the MAC address to the DHCP servers list of fixed IP-adresses before starting the system for the first time. This way you know beforehand which IP-address to connect to. == Guest OS == Continue by configuring the [[KVM Guest Operating System|KVM Guest Operating System]]. |
Domain Cloning
Once a template system has been installed, that system can be cloned. virt-clone will automatically change the MAC address of your network device.
Cloning
Use the script below to clone your template.
domain_clone_bullseye.sh
1 #!/bin/sh
2
3 SRC_VOLUME_GROUP="vg_storage"
4 DST_VOLUME_GROUP="vg_storage"
5 SRC_NAME="bullseye-template"
6 SRC_VOLUME="kvm_${SRC_NAME}_vda"
7 SRC_VOLUME_SIZE=`lvs /dev/${SRC_VOLUME_GROUP}/${SRC_VOLUME} -o LV_SIZE --noheadings --units B --nosuffix`
8 DST_NAME="bullseye-clone"
9 DST_VOLUME="kvm_${DST_NAME}_vda"
10 DST_MEMORY="256M"
11 MOUNTPOINT="/mnt/domain_root"
12 MAC=""
13
14 if [ ! -e /sbin/kpartx ]
15 then
16 apt-get install -y kpartx
17 fi
18
19 if [ $# -gt 0 ]
20 then
21 DST_NAME=${1}
22 DST_VOLUME="kvm_${DST_NAME}_vda"
23 fi
24
25 if [ "${2}" != "" ]
26 then
27 MAC="--mac ${2} "
28 else
29 MAC=$(grep ${DST_NAME} /root/scripts/mac | awk -F "\t" {'print $1'})
30 MAC="--mac ${MAC}"
31 fi
32
33 if [ ! -e /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} ]
34 then
35 # create lvm partition
36 lvcreate --yes --size ${SRC_VOLUME_SIZE}B --name ${DST_VOLUME} ${DST_VOLUME_GROUP}
37
38 # clone the domain
39 virt-clone \
40 --original ${SRC_NAME} \
41 --name ${DST_NAME} \
42 --file /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} \
43 ${MAC} \
44 --check path_in_use=off,path_exists=off
45
46 # mount the domains / partition
47 OFFSET=`kpartx /dev/${DST_VOLUME_GROUP}/${DST_VOLUME} | tail -n1|awk {'print $6'}`
48 OFFSET_BYTES="$((${OFFSET} * 512))"
49 losetup -o ${OFFSET_BYTES} /dev/loop0 /dev/${DST_VOLUME_GROUP}/${DST_VOLUME}
50 pvscan
51 vgscan
52 vgchange -ay vg_os
53 if [ ! -e ${MOUNTPOINT} ]
54 then
55 mkdir -p ${MOUNTPOINT}
56 fi
57 mount -o subvol=@rootfs /dev/vg_os/root ${MOUNTPOINT}
58 # manipulate domain
59 mkdir ${MOUNTPOINT}/root/scripts
60 cp /root/scripts/guest_cleanup.sh ${MOUNTPOINT}/root/scripts
61 # hostname
62 cp ${MOUNTPOINT}/etc/hosts ${MOUNTPOINT}/etc/hosts.kk
63 sed -i "s/${SRC_NAME}/${DST_NAME}/g" ${MOUNTPOINT}/etc/hosts
64 cp ${MOUNTPOINT}/etc/hostname ${MOUNTPOINT}/etc/hostname.kk
65 sed -i "s/${SRC_NAME}/${DST_NAME}/g" ${MOUNTPOINT}/etc/hostname
66
67 # rc.local
68 echo "#!/bin/sh" > ${MOUNTPOINT}/etc/rc.local
69 # this delay is needed for the network to settle, works with 32, but using 64 to be sure
70 #echo "sleep 64" >> ${MOUNTPOINT}/etc/rc.local
71 echo "/root/scripts/guest_cleanup.sh ${DST_NAME}" >> ${MOUNTPOINT}/etc/rc.local
72 echo "rm /etc/rc.local" >> ${MOUNTPOINT}/etc/rc.local
73 echo "shutdown -h 0" >> ${MOUNTPOINT}/etc/rc.local
74 echo "exit 0" >> ${MOUNTPOINT}/etc/rc.local
75 chmod +x ${MOUNTPOINT}/etc/rc.local
76 # ssh keys
77 mkdir ${MOUNTPOINT}/root/.ssh
78 cat /root/scripts/login_id_rsa.pub >> ${MOUNTPOINT}/root/.ssh/authorized_keys
79 mkdir ${MOUNTPOINT}/home/kale/.ssh
80 cat /root/scripts/login_id_rsa.pub >> ${MOUNTPOINT}/home/kale/.ssh/authorized_keys
81 chown -R kale:kale ${MOUNTPOINT}/home/kale/
82 # unmount and cleanup
83 umount ${MOUNTPOINT}
84 vgchange -an vg_os
85 losetup -d /dev/loop0
86 # cleanup domain
87 virt-xml ${DST_NAME} --edit --graphics password=${DST_NAME}
88 #virt-xml ${DST_NAME} --remove-device --graphics all
89 virsh setmaxmem ${DST_NAME} --size ${DST_MEMORY} --config
90 virsh setmem ${DST_NAME} --size ${DST_MEMORY} --config
91 virsh start ${DST_NAME}
92 else
93 echo "${0}: refusing to overwrite existing domain"
94 fi
Cleaning up Guest OS on First Boot
Before using this script, notice that the root password is set to the hostname. Please make up your own method for setting the root password. Preferable it should be randomized and ssh keys should be used instead of knowing the password.
guest_cleanup.sh
1 #!/bin/sh
2
3 NAME=""
4 if [ $# -gt 0 ]
5 then
6 # the new hostname
7 NAME=${1}
8
9 # root password
10 echo "root:${NAME}" | chpasswd
11
12 # sshd
13 rm /etc/ssh/ssh_host_*
14 dpkg-reconfigure openssh-server
15 systemctl restart sshd
16
17 # extend filesystem size
18 lvextend --size 3G /dev/vg_os/root
19 btrfs filesystem resize max /
20
21 # network
22 cp /etc/default/grub /etc/default/grub.kk
23 sed -i 's/GRUB_CMDLINE_LINUX=""/GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"/g' /etc/default/grub
24 update-grub
25 cp /etc/network/interfaces /etc/network/interfaces.kk
26 sed -i 's/allow-hotplug enp1s0/allow-hotplug eth0/' /etc/network/interfaces
27 sed -i 's/allow-hotplug eth0/#allow-hotplug eth0\nauto eth0/' /etc/network/interfaces
28 sed -i 's/iface enp1s0 inet dhcp/iface eth0 inet dhcp/' /etc/network/interfaces
29
30 # cleanup
31 rm /root/scripts/guest_cleanup.sh
32 rmdir /root/scripts
33 shutdown -h 0
34 else
35 echo ${0}: requires a hostname as parameter
36 fi
A List of Predefined MAC Adresses
mac
#<mac><tab><hostname> # virtual devices for redundant setup 52:54:00:52:de:25 ns01 52:54:00:cf:5c:d3 ns02 52:54:00:65:0f:42 dhcp01 52:54:00:47:84:7d dhcp02 52:54:00:e0:0f:1d ntp01 52:54:00:b6:76:ee ntp02 # virtual devices for maintenance 52:54:00:94:a4:2e login
Make a clone.
./domain_clone_bullseye.sh clone
Memory
Increase or decrease amount of memory by editing the domain.
Network
For your convenience add the MAC address to the DHCP servers list of fixed IP-adresses before starting the system for the first time. This way you know beforehand which IP-address to connect to.
Guest OS
Continue by configuring the KVM Guest Operating System.