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Setting up NBD server / client - block nbd4: Other side returned error (22) issue



Hi folks,
I’m trying setup a client that connect to a 500Gb ext4 disk on another machine running nbd server.
Server: raspberry pi 3: uname -r 4.19.66+
Client: raspberry pi 3: uname -r 5.10.17-v7+

I’ve followed the information here [https://github.com/NetworkBlockDevice/nbd] and a lot of other sites but I think I’m doing something wrong on the server setup because I get this on the client:

$ sudo mount /dev/nbd2 /home/pi/Vols/nbd1-recipes/
mount: /home/pi/Vols/nbd1-recipes: can't read superblock on /dev/nbd2

Also it appears to be listening on default port - NOT ones specified in config file.

This is how I’ve set up the server & client, it’s probably something obvious to more experienced folk.

== rpi-C3 (192.168.1.14) server setup
> sudo apt-get update
> sudo apt-get install nbd-server
> sudo nano /etc/nbd-server/config 
[generic]
# If you want to run everything as root rather than the nbd user, you
# may either say "root" in the two following lines, or remove them
# altogether. Do not remove the [generic] section, however.
        user = nbd
        group = nbd
        includedir = /etc/nbd-server/conf.d
        allowlist = true

# What follows are export definitions. You may create as much of them as
# you want, but the section header has to be unique.
[images]
        exportname = /home/pi/media/500G_FAITH/images
        port = 510029
[recipes]
        exportname = /home/pi/media/500G_FAITH/recipes
        port = 510030
[movie]
        exportname = /home/pi/media/500G_FAITH/movies
        port = 510031
> sudo modprobe nbd # NOT nbd-server!
> lsmod | grep nbd
nbd                    40960  0
> sudo service nbd-server force-reload # if already running

== client side
> sudo apt-get install nbd-client # done
> sudo modprobe nbd
> nbd-client 192.168.1.14 -l
Negotiation: ..
images
recipes
movie
> sudo nbd-client 192.168.1.14 -N recipes /dev/nbd2
Negotiation: ..size = 0MB
Connected /dev/nbd2
> sudo nbd-client 192.168.1.14 -N movie /dev/nbd3
Negotiation: ..size = 0MB
Connected /dev/nbd3
> sudo nbd-client 192.168.1.14 -N images /dev/nbd1
Negotiation: ..size = 0MB
Connected /dev/nbd1

> dmesg | tail -n 10
[ 1417.883364] Buffer I/O error on dev nbd1, logical block 0, async page read
[ 1417.884614] block nbd1: Other side returned error (22)
[ 1417.884652] blk_update_request: I/O error, dev nbd1, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 1417.884673] Buffer I/O error on dev nbd1, logical block 0, async page read
[ 1417.885977] block nbd1: Other side returned error (22)
[ 1417.886016] blk_update_request: I/O error, dev nbd1, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 1417.886036] Buffer I/O error on dev nbd1, logical block 0, async page read
[ 1417.887276] block nbd1: Other side returned error (22)
[ 1417.888492] block nbd1: Other side returned error (22)
[ 1417.889751] block nbd1: Other side returned error (22)
> sudo nbd-client 192.168.1.14 -d /dev/nbd1 # thought it might be something to do w/ nbd1
> sudo nbd-client 192.168.1.14 -N images /dev/nbd4
Negotiation: ..size = 0MB
Connected /dev/nbd4
> dmesg | tail -n 10
[ 1848.831897] block nbd4: Other side returned error (22)
[ 1848.833341] block nbd4: Other side returned error (22)
[ 1848.834651] block nbd4: Other side returned error (22)
[ 1848.836002] block nbd4: Other side returned error (22)
> lsblk -f
NAME        FSTYPE  LABEL         UUID                                 FSAVAIL FSUSE% MOUNTPOINT
sda                                                                                   
├─sda1      vfat    EFI           67E3-17ED                                           
└─sda2      hfsplus time_box_2018 f6427a3d-363b-3284-88c4-03ce3493aeff  115.5G    94% /media/pi/time_box_2018
nbd2                                                                                  
nbd3                                                                                  
nbd4                                                                                  
mmcblk0                                                                               
├─mmcblk0p1 vfat    boot          5DE4-665C                             203.4M    19% /boot
└─mmcblk0p2 ext4    rootfs        7295bbc3-bbc2-4267-9fa0-099e10ef5bf0    4.1G    37% /
> dmesg | tail -n 10
[ 1848.836002] block nbd4: Other side returned error (22)
[ 1848.837430] block nbd4: Other side returned error (22)
[ 1848.838860] block nbd4: Other side returned error (22)
[ 1848.840224] block nbd4: Other side returned error (22)
[ 1848.841691] block nbd4: Other side returned error (22)
[ 1848.843077] block nbd4: Other side returned error (22)
[ 1848.844415] block nbd4: Other side returned error (22)
[ 2802.615037] block nbd3: Receive control failed (result -32)
[ 2802.625871] block nbd2: Receive control failed (result -32)
[ 2802.648444] block nbd4: Receive control failed (result -32)
> ls /home/pi/Vols/
nbd1-recipes/    rpi-C2-nbd-500G/ tbx2018/         time_box_2018/   
> sudo mount /dev/nbd2 /home/pi/Vols/nbd1-recipes/
mount: /home/pi/Vols/nbd1-recipes: can't read superblock on /dev/nbd2.
> sudo parted -l
Model: Seagate BUP Slim SL (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name                  Flags
 1      20.5kB  210MB   210MB   fat32        EFI System Partition  boot, esp
 2      210MB   2000GB  2000GB  hfs+         time_box_2018


Error: /dev/nbd3: unrecognised disk label
Model: Unknown (unknown)                                                  
Disk /dev/nbd3: 4096B
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags: 

Error: /dev/nbd4: unrecognised disk label
Model: Unknown (unknown)                                                  
Disk /dev/nbd4: 4096B
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags: 

Error: /dev/nbd2: unrecognised disk label
Model: Unknown (unknown)                                                  
Disk /dev/nbd2: 4096B
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags: 

Model: SD SL08G (sd/mmc)
Disk /dev/mmcblk0: 7948MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags
 1      4194kB  273MB   268MB   primary  fat32        lba
 2      273MB   7948MB  7676MB  primary  ext4

I’ve been trying to get them to talk for 2 days now 
One thing I did notice is that the port numbers in the config file don’t seem to change the fact it’s listening on he default port??

$ sudo lsof -i -P -n | grep LISTEN
COMMAND    PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
cnid_meta  312    root    3u  IPv6  11170      0t0  TCP [::1]:4700 (LISTEN)
afpd       324    root    3u  IPv4  11195      0t0  TCP *:548 (LISTEN)
sshd       426    root    3u  IPv4  12126      0t0  TCP *:22 (LISTEN)
sshd       426    root    4u  IPv6  12128      0t0  TCP *:22 (LISTEN)
dnsmasq    431 dnsmasq    5u  IPv4  12046      0t0  TCP *:53 (LISTEN)
dnsmasq    431 dnsmasq    7u  IPv6  12048      0t0  TCP *:53 (LISTEN)
nbd-serve 2026     nbd    3u  IPv6  20100      0t0  TCP *:10809 (LISTEN)

I’d be very grateful for any pointers, or other resources that my be of help.
Thanks in advance,
Simon





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