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The following conditions must be fulfilled in order to VM be able to receive connections from outside:
VM has a default route pointing to 192.168.122.1.
Firewall has DNAT rule configured.
In your case, first one is likely missing. This results in VM network stack dropping the SYN-ACK packets sent by the TCP protocol. This happens because the client VM does ...
1
Under no circumstances allow the VM to be shut down yet, as your disks will likely be irretrievably lost if that happens.
You can recover the deleted disks data by copying data from the live file descriptor QEMU holds open as long as it is running....
You need to find the process ID of the QEMU process first of all.
Then look in /proc/$PID/fd/ and you ...
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A few months ago I set up two KVM hosts using CentOS 8.1.1911 with a Hyper-V VM as a nested guest and it all worked fine.
A couple of months later, I set up a third KVM host with a near identical hardware and software configuration. The only difference was the motherboard, which had the same chipset, but was Gigabyte branded not ASUS branded as per the first ...
1
Your choice of whether your operating system environments are to be installed in physical servers, VMs, or containers. There is not one best way. Try deploying something in a lab environment.
I assume by "port conflicts" you mean the same TCP ports for multiple listening services. Design your network to not have these problems. Perhaps you have ...
1
Your VM is emluating an rtl8139 NIC, a 10/100 Mbps device from the mid-1990s. This driver is only present so that KVM can allow ancient operating systems to connect to the network.
For modern operating systems, anything that is still commonly used today, it's best to use the virtio NIC. This paravirtualized NIC has built-in drivers in Linux, and available ...
1
You made a virtual hardware change which requires the VM to be fully shut down (not just rebooted) before it takes effect.
BTW: For reasons of performance you should install the Virtio-SCSI driver in the guest OS, add the Virtio-SCSI controller to the virtual hardware, and convert your disks to use SCSI instead of IDE. And switch your virtual CDROM to SATA. ...
1
No need to disable the dnsmasq service in the Libvirtd.
Just tell DNSMASK to listen on needed interfaces:
Edit
/etc/dnsmasq.conf
Uncomment:
bind-interfaces
Restart dnsmasq:
systemctl restart dnsmasq.service
Additional informathion:
Libvirtd and dnsmasq
This command may be useful. To check which interfaces used:
netstat -anp | grep :53
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