1 NBD — Network Block Device — is a protocol for accessing Block Devices
2 (hard disks and disk-like things) over a Network.
4 nbdkit is a toolkit for creating NBD servers.
8 * Multithreaded NBD server written in C with good performance.
10 * Minimal dependencies for the basic server.
12 * Liberal license (BSD) allows nbdkit to be linked to proprietary
13 libraries or included in proprietary code.
15 * Well-documented, simple plugin API with a stable ABI guarantee.
16 Lets you export “unconventional” block devices easily.
18 * You can write plugins in C, Lua, Perl, Python, OCaml, Ruby, Rust,
21 * Filters can be stacked in front of plugins to transform the output.
23 For documentation, see the ‘docs/’ directory.
25 For plugins, examples and filters, see the ‘plugins/’ and ‘filters/’
31 This software is copyright (C) Red Hat Inc. and licensed under a BSD
32 license. See ‘LICENSE’ for details.
40 To build the basic server and some plugins nbdkit needs nothing except
41 Linux, FreeBSD or OpenBSD, and:
49 Although it is possible to build without it, it’s recommended to
50 enable TLS (authentication and encryption) support for which you will
58 To build the man pages, you will optionally need to install:
62 - Pod::Man and Pod::Simple (Perl library)
64 For SELinux socket labelling support:
76 For the curl (HTTP/FTP) plugin:
83 (this is a different library from libssh2 - that will not work)
87 - genisoimage or mkisofs
89 For the floppy plugin:
91 - iconv (on Linux this is built into glibc, on other systems
92 it may be a separate library)
94 For the libvirt plugin:
98 For the libguestfs plugin, and to run parts of the test suite:
102 - guestfish (from libguestfs)
110 For the linuxdisk plugin:
112 - mke2fs >= 1.42.10 (from e2fsprogs)
114 For the nbd plugin, to get URI and TLS support:
118 For the Perl, example4 and tar plugins:
122 - perl development libraries
124 - perl module ExtUtils::Embed
126 For the Python plugin:
128 - python interpreter (version 3 only)
130 - python development libraries
132 For the OCaml plugin:
138 - Tcl development library and headers
142 - Lua development library and headers
146 - cargo (other dependencies will be downloaded at build time)
148 For bash tab completion:
150 - bash-completion >= 1.99
152 To test for memory leaks (‘make check-valgrind’):
154 - valgrind program and development headers
156 For non-essential enhancements to the test suite:
158 - ip, ss (from iproute package)
162 - losetup (from util-linux package)
164 - mke2fs (from e2fsprogs)
166 - nbdsh (from libnbd)
168 - qemu-img, qemu-io, qemu-nbd (usually shipped with qemu)
170 - sfdisk (from util-linux)
176 - stat (from coreutils)
181 To build from tarball: To build from git:
182 ---------------------- ------------------
184 ./configure ./configure
186 make check make check
188 To run nbdkit from the source directory, use the top level ./nbdkit
189 wrapper. It will run nbdkit and plugins from the locally compiled
192 $ ./nbdkit example1 -f -v
193 ./server/nbdkit ./plugins/example1/.libs/nbdkit-example1-plugin.so -f -v
196 Optionally run this command as root to install everything:
203 Since nbdkit >= 1.16, only Python >= 3.3 is supported.
205 By default nbdkit uses the Python version of the Python interpreter
206 called “python” on the current $PATH. If you have parallel versions
207 of Python installed then you can choose a different version by setting
208 the PYTHON variable when configuring. For example:
210 ./configure PYTHON=/usr/bin/python3.8
215 You will need to install libguestfs to run most of the test suite:
219 The test suite is fairly comprehensive. It runs the newly built
220 nbdkit + plugins as a captive process, and tests them using
221 libguestfs. If there is a failure, look at the corresponding
222 ‘tests/*.log’ file for debug information.
224 A few tests require root privileges, and are skipped by default. To
225 run them you must do:
229 If you have the proprietary VDDK library, you can test
230 nbdkit-vddk-plugin against the library like this:
232 make check-vddk vddkdir=vmware-vix-disklib-distrib
237 Tarballs are available from:
238 http://libguestfs.org/download/nbdkit
243 Install the valgrind program and development headers.
247 ./configure --enable-gcc-warnings --enable-valgrind
254 For development ideas, see the TODO file.
256 The upstream git repository is:
257 https://github.com/libguestfs/nbdkit
259 Please send patches to the libguestfs mailing list:
260 https://www.redhat.com/mailman/listinfo/libguestfs
262 For further information, see:
263 http://libguestfs.org/
264 https://github.com/NetworkBlockDevice/nbd/blob/master/doc/proto.md