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[libguestfs-talks.git] / 2019-kvm-forum / notes-01-introduction

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-Quick Introduction to NBD
-[About 2 mins 30 seconds]
-
-* Heading: Linux 2.1.55 (1997)
-- Diagram showing two machines
-- Physical disk attached to one
-- Exported to /dev/nbd0 on the other
-- NBD_CMD_READ (0) or NBD_CMD_WRITE (1) only
-
-Network Block Device is a protocol for exporting a disk from
-one machine to another over a network.  It was added to
-Linux 2.1.55 in 1997 and started off very simple with just two commands.
-
-* Heading: Linux 5 (2019)
-- Same diagram annotated with additional commands:
-- DISC, FLUSH, TRIM, CACHE, WRITE_ZEROES, BLOCK_STATUS, RESIZE
-
-In 2019 NBD is quite a bit more complicated, but still
-overall a simple protocol.
-
-* Heading: Exporting a point in time snapshot over NBD
-- Diagram showing qemu exporting a point in time snapshot of a live guest
-- blockdev-backup device=A target=Target sync=none job-id=job1
-- nbd-server-start addr={"type":"unix","data":{"path":"./nbd-sock"}}
-- nbd-server-add device=Target
-
-Our use of NBD today is quite a bit different from how it was
-intended back in 1997.  Here are some ways we're using it today.
-
-As a way to export a point in time snapshot from qemu.
-
-* Heading: Virt-v2v using nbdkit to read a VDDK disk
-- Diagram showing virt-v2v + nbdkit + vddk + VMware
-
-As a way to read a VDDK disk and convert it to run on KVM.
-
-* Heading: qemu-nbd as a high performance server
-- Diagram showing qemu-nbd used by RHV ImageIO
-
-As a high performance server, serving qcow2 files for ImageIO.
-
-* Heading: qemu-img convert from RHV ImageIO to KubeVirt
-- Diagram showing nbdkit -> qemu-img convert -> nbdkit
-
-Copying disk images efficiently between KVM-based management systems.
-
-* Heading: nbdkit linuxdisk used to boot remote machines
-- Diagram showing linuxdisk synthesizing an initramfs/filesystem
-
-Using it as a replacement for TFTP when PXE-booting machines
-over the network.
-
-* Heading: Running RISC-V VMs from remote xz-compressed images
-- nbdkit --filter=xz curl https://dl.fedoraproject.org/pub/alt/risc-v/disk-images/fedora/rawhide/20190703.n.0/Developer/Fedora-Developer-Rawhide-20190703.n.0-sda.raw.xz
-
-It's one way to test Fedora RISC-V VMs without downloading them.
-
-* Heading: Making disk images for testing
-- Diagram showing an nbdkit shell script plugin
-
-As a general purpose tool to make disk images for testing.
-
-You can think of NBD as a universal protocol that you can use
-whenever you need to access a virtual machine disk, disk image,
-or block device between two processes, whether or not the
-processes are running on the same machine.