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kvm:nested [2016/04/03 18:04] Toni Corvera |
kvm:nested [2016/04/04 00:20] Toni Corvera |
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| Some random notes (to be sorted at some point) on running KVM inside KVM, e.g. to test-run Cloudmin/Proxmox/CoreOS without affecting your machine. | Some random notes (to be sorted at some point) on running KVM inside KVM, e.g. to test-run Cloudmin/Proxmox/CoreOS without affecting your machine. | ||
| + | Notice nesting is not enabled by default, it can be checked on ''/sys'' and enabled by passing ''nested=1'' as an option to the module: | ||
| + | |||
| + | $ cat /sys/module/kvm_intel/parameters/nested | ||
| + | N | ||
| + | rmmod kvm-intel # or kvm-amd | ||
| + | modprobe kvm-intel nested=1 | ||
| + | $ cat /sys/module/kvm_intel/parameters/nested | ||
| + | Y | ||
| + | | ||
| Command-line example: | Command-line example: | ||
| - | # kvm -hda /dev/vg/lvkvm -cdrom osinstall.iso -boot d \ | + | # kvm -hda /dev/vg/lvkvm -cdrom osinstall.iso -boot d -m 1G \ |
| -vnc :2 -netdev tap,id=net0,ifname=tap0 -device virtio-net,netdev=net0,mac=52:54:00:12:34:56 -cpu host | -vnc :2 -netdev tap,id=net0,ifname=tap0 -device virtio-net,netdev=net0,mac=52:54:00:12:34:56 -cpu host | ||
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| * ''-hda /dev/vg/lvkvm'' → Use an LVM Logical Volume as the first hard disk | * ''-hda /dev/vg/lvkvm'' → Use an LVM Logical Volume as the first hard disk | ||
| * ''-cdrom osinstall.iso -boot d'' → Connect this ISO to the guest's DVD drive and boot from it | * ''-cdrom osinstall.iso -boot d'' → Connect this ISO to the guest's DVD drive and boot from it | ||
| + | * ''-m 1G'' → Provide the guest 1 GB of RAM | ||
| * ''-vnc :2'' → Run the display as a VNC server | * ''-vnc :2'' → Run the display as a VNC server | ||
| * ''-netdev tap,id=net0,ifname=tap0 -device virtio-net,netdev=net0,mac=52:54:00:12:34:56'' → Use TAP networking with virtio drivers (combined with a host bridge it integrates in the LAN), see [[linux:bonding-bridge]] | * ''-netdev tap,id=net0,ifname=tap0 -device virtio-net,netdev=net0,mac=52:54:00:12:34:56'' → Use TAP networking with virtio drivers (combined with a host bridge it integrates in the LAN), see [[linux:bonding-bridge]] | ||