I have been trying to setup NBD to present a shared storage device for me to play around with Xen live mobility. NBD is not tricky, but the documentation, both official and Google, is flawed and confusing.<\/p>\n\n\n\n
To get a basic device working and mounted, follow the simple guide below.<\/p>\n\n\n\n
Setup a basic config file \/etc\/nbd-server\/config <\/p>\n\n\n\n
The main thing to take note of in the server configuration is the section heading<\/em> which contains the device on the server to export. The section heading is what the client sees and connects to. Furthermore, the nbd-client man page appears to be incorrect, so go by the nbd-client usage text which says:<\/p>\n\n\n\n so the correct way to connect to the device exported is:<\/p>\n\n\n\n \/dev\/nbd0 is a device on the client<\/em> which you can choose from amongst what you can see with the listing From the client, you can see what is exported by the command<\/p>\n\n\n\n If you get the error <\/p>\n\n\n\n you need to load the module for nbd-client: If you get the following error<\/p>\n\n\n\n Is is because you have missed out the -N option with the share name in the command. Despite this option being mandatory, nbd-client doesn’t enforce it and the man page doesn’t even mention the option. Poor form. Or maybe it is because you can specify it in nbdtab, I have not looked in to that.<\/p>\n\n\n\n Generally, nbd is badly documented and has some bugs, not great. But once it is up and running, it is ok.<\/p>\n","protected":false},"excerpt":{"rendered":" I have been trying to setup NBD to present a shared storage device for me to play around with Xen live mobility. NBD is not tricky, but the documentation, both official and Google, is flawed and confusing. To get a … Continue reading [generic]
user = nbd
group = nbd
listenaddr = 2021:85b:2d9:1::101
allowlist = true<\/code><\/p>\n\n\n\n[grafana-root]
exportname = \/dev\/rootvg\/nbdlv<\/code><\/p>\n\n\n\nallowlist<\/code> is not stricly necessary, but it helps being able to list exported devices from the client end whilst configuring all this. Maybe remove it afterwards…<\/p>\n\n\n\nUsage: nbd-client -name|-N name host [port] nbd_device<\/code><\/p>\n\n\n\nnbd-client 2021:85b:2d9:1::101 10809 \/dev\/nbd0 -N grafana-root<\/code><\/p>\n\n\n\n ls \/dev\/nbd*<\/code>.<\/p>\n\n\n\nnbd-client -l 2021:85b:2d9:1::101<\/code><\/code><\/h1>\n\n\n\nNegotiation: ..
grafana-root<\/code><\/p>\n\n\n\nError: Cannot open NBD: No such file or directory
Please ensure the 'nbd' module is loaded.
Exiting.<\/code><\/p>\n\n\n\nmodprobe nbd<\/code><\/p>\n\n\n\nNegotiation: ..Error: Unknown error in reply to NBD_OPT_GO; cannot continue<\/code><\/p>\n\n\n\n