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kvm-script

tools to management KVM

configure your network in global.vars

cat global.vars
vim global.vars

vm networks

Generate a mac pool for host interfaces

./cmd/generate_mac_pool.sh

declare -A MACS=([host1]="" [host2]="" [hostn]="")
./cmd/generate_mac_pool.sh

Generate network xml snippet files and create network

./cmd/generate_network_xmls.sh

./cmd/generate_network_xmls.sh NET_NAMES NET_MACS
ls /tmp/vir_network
virsh net-create /tmp/vir_network
virsh net-list

delete a network by: virsh net-destroy

Generate domain xml snippet files and create vm

please prepare a image for VM firstly follow these guide:

./cmd/generate_domain_xml.sh

export HOST=cloud
export BASEIMG=/var/lib/libvirt/images/$HOST.qcow2

export VM_NAME=smartcity_$HOST
export VM_MEMSIZE_G=10
export VM_VCPUS=6

./cmd/generate_domain_xml.sh NET_MACS $HOST NET_NAMES
virsh create /tmp/vir_domain/$VM_NAME.xml
virsh list

You can also install a vm by: 15 virt-install examples | KVM virtualization commands cheatsheet

inject interface script to disable dhcp

./cmd/inject_tail_ifcs_script.sh
./cmd/inject_tail_ifcs_script.sh $dom

set hostname for domain

./cmd/set_hostname.sh
./cmd/set_hostname.sh $dom $hostname

inject ssh key into domain

./cmd/inject_ssh_key.sh
./cmd/inject_ssh_key.sh $dom $user $key_file

resize volume for a domain

./cmd/resize_volume.sh
./cmd/resize_volume.sh $dom $size $disk $volume

attach a disk to a domain

./cmd/attach_disk.sh
./cmd/attach_disk.sh $dom $size

Resize volume in guest

This command is used for extend lvm in an activity guest. Please check your guest OS support hot plugin.

# grep "CONFIG_HOTPLUG_PCI_ACPI=" /boot/config-`uname -r`
CONFIG_HOTPLUG_PCI=y

# grep "CONFIG_HOTPLUG_PCI=" /boot/config-`uname -r`
CONFIG_HOTPLUG_PCI_ACPI=y

# grep "CONFIG_MEMORY_HOTPLUG=" /boot/config-`uname -r`
CONFIG_MEMORY_HOTPLUG=y

run these commands in host:

dom=virtio_nic
./cmd/create_lvm_in_vm.sh 
./cmd/run_in_vm.sh $dom lsblk
./cmd/run_in_vm.sh $dom lvdisplay 
dev=vda
lv=/dev/centos/root
./cmd/create_lvm_in_vm.sh $dom $dev $lv

you can also run these commands in guest:

GUSER=root
host=
scp ./src/vm/script/create_lvm.sh $GUSER@$host:~/
ssh $GUSER@$host
./create_lvm.sh $dev $lv_path

run command or script in guest

./cmd/run_in_vm.sh
echo "cat /etc/hostname" >> guest_host.sh
chmod a+x guest_host.sh
./cmd/run_in_vm.sh $dom - ./guest_host.sh
./cmd/run_in_vm.sh $dom lsblk

Set a proxy for vm access

host:port -> vm:port

./cmd/vm_port_proxy.sh
./cmd/vm_port_proxy.sh $dom 8080

login guest by ssh

cp ./cmd/ssh_vm.sh /usr/bin/ssh-vm
ssh-vm

ssh vm

enhancement

leverage yp to pareser xml

# https://www.cloudsavvyit.com/1889/how-to-convert-xml-to-json-on-the-command-line/
# https://stackoverflow.com/questions/61666898/convert-xml-to-json-using-command-line-or-using-shell-script
# https://www.endpoint.com/blog/2019/12/31/making-sense-of-xml-json-in-shell
# https://unix.stackexchange.com/questions/504880/script-to-translate-xml-to-json
# http://manpages.ubuntu.com/manpages/bionic/man1/xml2json.1p.html
# https://codefaster.substack.com/p/mastering-jq-xml-and-any-other-data
# https://www.hellocodeclub.com/how-to-convert-xml-to-json-in-python-ultimate-guide/
# https://linuxhint.com/python_xml_to_json/
https_proxy=http://comany.com:xxx  pip3 install yq

cat | xq .  << EOF
<e>
  <a>some</a>
  <b>textual</b>
  <a>content</a>
</e>
EOF

cat | xq -x << EOF
{
  "e": {
    "a": [
      "some",
      "content"
    ],
    "b": "textual"
  }
}
EOF

REF:

  • install window guest with virtio drivers