1nbdkit-client(1)                    NBDKIT                    nbdkit-client(1)
2
3
4

NAME

6       nbdkit-service - how to mount NBD filesystems on a client machine
7

DESCRIPTION

9       For NBD exports that contain filesystems there are several approaches
10       to mounting them on a client machine.
11
12       To ensure the nbd kernel module is loaded you may need to do:
13
14        # echo nbd > /etc/modules-load.d/nbd.conf
15
16       This will not take effect until you reboot, so also do:
17
18        # modprobe nbd
19
20   Easy mounting at boot time
21       For simple setups the following method is the easiest way to get an NBD
22       filesystem to mount at boot.  Create or edit /etc/rc.local or
23       /etc/rc.d/rc.local:
24
25        #!/bin/sh -
26        nm-online
27        modprobe nbd
28        nbd-client server /dev/nbd0
29        mount /dev/nbd0 /mnt
30
31   Mounting using systemd mount points
32       You can use systemd mount points to mount NBD filesystems at boot
33       and/or on demand.
34
35       Set up an nbdtab(5) mapping.  If /etc/nbdtab doesn't exist, then create
36       it first.  Add this line:
37
38        nbd0 server / bs=512,persist
39
40       As a workaround for https://github.com/NetworkBlockDevice/nbd/issues/91
41       you must currently modify the nbd@.service file:
42
43        # cp /usr/lib/systemd/system/nbd@.service /etc/systemd/system/
44        # vi /etc/systemd/system/nbd@.service
45
46       and edit or create these settings in the "[Service]" section:
47
48        [Service]
49        Type=oneshot
50        RemainAfterExit=yes
51        ExecStart=/usr/sbin/nbd-client %i
52        ExecStop=/usr/sbin/nbd-client -d /dev/%i
53
54       Finally create a systemd mount file called
55       /etc/systemd/system/mnt.mount:
56
57        [Unit]
58        Requires=nbd@nbd0.service
59        [Mount]
60        What=/dev/nbd0
61        Where=/mnt
62        Type=ext4
63
64       You can either reboot now or do:
65
66        # systemctl start mnt.mount
67
68       Other systemd services which need this mount point can depend on this
69       mount unit.
70

SEE ALSO

72       nbdkit(1), nbdkit-loop(1), nbdkit-service(1), nbd-client(8), nbdtab(5),
73       systemd(1), systemd.mount(5).
74

AUTHORS

76       Richard W.M. Jones
77

79       Copyright (C) 2013-2020 Red Hat Inc.
80

LICENSE

82       Redistribution and use in source and binary forms, with or without
83       modification, are permitted provided that the following conditions are
84       met:
85
86       •   Redistributions of source code must retain the above copyright
87           notice, this list of conditions and the following disclaimer.
88
89       •   Redistributions in binary form must reproduce the above copyright
90           notice, this list of conditions and the following disclaimer in the
91           documentation and/or other materials provided with the
92           distribution.
93
94       •   Neither the name of Red Hat nor the names of its contributors may
95           be used to endorse or promote products derived from this software
96           without specific prior written permission.
97
98       THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY
99       EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100       IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
101       PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE
102       LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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104       SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
105       BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
106       WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
107       OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
108       ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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112nbdkit-1.25.8                     2021-05-25                  nbdkit-client(1)
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