Kvm

This is a very broad title, and will probably not help anyone except for me if this happens for me again. One day when I had to restart my KVM host, none of my guests had internet connection. The eth0 on the KVM host was attached to a bridge (br0) and that host had connectivity through the bridge. Here are some configs (which had not changed since it worked): # /etc/network/interfaces source /etc/network/interfaces.d/* # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 iface eth0 inet manual #iface eth0 inet dhcp auto br0 iface br0 inet dhcp bridge_ports eth0 bridge_stp off bridge_fd 0 bridge_maxwait 0 Configuration seems good to me. I have never needed stp=on, so it should be alright. ...

Installation (No X11) # Install prerequirements (ignore virtinst if you have x11) sudo apt-get install qemu-kvm libvirt-bin virtinst sudo usermod -aG kvm $USER sudo usermod -aG libvirt $USER Creating a new host (i.e. guest) # NAME-OF-VHOST is whatever you want to call your virtual host # SIZE-IN-MB is how many MBs of RAM you want to give the new host # LOCATION is the location to install from, you can find locations by typing `man virt-install` # NAME-OF-DISK is what disk you want to provide to the vhost, e.g. a partition sudo virt-install --virt-type kvm --name NAME-OF-VHOST --memory SIZE-IN-MB --location LOCATION --extra-args "console=ttyS0" --disk /dev/NAME-OF-DISK # Example sudo virt-install --virt-type=kvm --name david2 --memory 16384 --location http://ftp.us.debian.org/debian/dists/stable/main/installer-amd64/ --disk /dev/vg0/lv1 --extra-args "console=ttyS0" # Example (ISO-file and vnc graphics) sudo virt-install --virt-type=kvm --name bleach --memory 4096 --disk /dev/vg0/lv5 --cdrom Fedora-Server-netinst-x86_64-27-1.6.iso --graphics=vnc,listen=127.0.0.1,password=verysecret Bridge guest to host network Add network interface In /etc/network/interfaces, change from ...