Shut down all vms
Every day I need to shut down all the virtual machines, which is a lot of work.
The script below is used to shut down all the running machines.
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#!/bin/bash
for i in `sudo virsh list | grep running | awk '{print $2}'`
do
sudo virsh shutdown $i
done
while [ 1 -gt 0 ]
do
n=`virsh list | wc -l`
if [ $n -eq 3 ]; then
sudo shutdown -P now
fi
sleep 1
done
Generate connect config on startup
I want to connect to windows kvm from the host machine via desktop viewer. I need to lanuch the Cockpit web console and then download the desktop viewer config file. After double click the config file, it was auto-deleted. This is just too much trouble
I generate the config via the following script.
/home/ljl is my home directory, you need to change to your own.
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#!/bin/bash
port=$(/usr/bin/virsh vncdisplay win10 | /usr/bin/awk -F: '/127.0.0.1/{print $2+5901}')
cat > /home/ljl/Downloads/win10 << EOF
[virt-viewer]
type=spice
host=127.0.0.1
port=$port
delete-this-file=1
fullscreen=1
[...............................GraphicsConsole]
EOF
chown ljl:ljl /home/ljl/Downloads/win10
Run sudo crontab -e and add the following line to the crontab.
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* * * * * /bin/bash /bin/get-win10-spice.sh
config disk as write through mode
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<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writethrough' discard='unmap'/>
<source file='/kvm-pools/build-farm/fed32-dev-130g.qcow2'/>
<target dev='sda' bus='scsi'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
deal with the permission deny error
Unfortunately, I’ve encountered this error. I can not add another disk for my VM.
$ cat /var/log/syslog | grep qemu
Aug 10 10:17:02 ljl-X99 libvirtd[1667]: internal error: qemu unexpectedly closed the monitor: 2024-08-10T02:17:02.234897Z qemu-system-x86_64: -blockdev {"driver":"file","filename":"/1t/200GB.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}: Could not open '/1t/200GB.qcow2': Permission denied
Fortunately, I found the following link that solved my problem. qemu with pool/volume storage: Could not open ‘xxxxxxx’: Permission denied
Modify file /etc/libvirt/qemu.conf, change the security_driver to “none”.
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security_driver = "none"
After finishing the above step, restart libvirtd.
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systemctl restart libvirtd
