A daemon that handles the userspace side of the NBD(Network Block Device) backstore.
A cli utility, which aims at making backstore creation/deletion/mapping/unmaping/listing.
nbd-runner nbd-cli
+----------------------+ +---------------------+
| | | |
| | | |
+-----------+ | RUNNER HOST IP | RPC control route | create/delete |
| | | listen on <---------------------> map/unmap/list, etc |
| Gluster <-----> TCP/24110 port | | + |
| | | | | | |
+-----------+ | | | | |
| | | | MAP will |
| | | | setup |
| | | | the NBD |
| | | | devices |
| | | | |
+-----------+ | | | | |
| | | | | | |
| Ceph <-----> | | | READ |
| | | IO HOST IP | MAPPED NBD(IO) route| v WRITE |
+-----------+ | listen on <-------------------->+ /dev/nbdXX FLUSH |
| TCP/24111 port | | TRIM |
| | | ... |
| | | |
+----------------------+ +---------------------+
NOTE: The 'RUNNER HOST IP' and the 'IO HOST IP' could be same or different, and the 'nbd-runner' and 'nbd-cli' could run on the same node or in different nodes, both are up to your use case. And please make sure that the 'nbd-runner' runs on one of the gluster/ceph server nodes.
nbd-runner is licensed to you under your choice of the GNU Lesser General Public License, version 3 or any later version (LGPLv3 or later), or the GNU General Public License, version 2 (GPLv2), in all cases as published by the Free Software Foundation.
$ git clone https://github.com/gluster/nbd-runner.git $ cd nbd-runner/ $ dnf install autoconf automake libtool kmod-devel libnl3-devel libevent-devel glib2-devel json-c-devel $ dnf install libtirpc-devel rpcgen # only on Fedora or some other Distributions that the glibc version >= 2.26 $ dnf install glusterfs-api-devel # only when the --with-gluster=yes or absent you need to install this $ dnf install libcurl-devel libuv-devel # only when the --with-azure=yes or absent you need to install this $ ./autogen.sh $ ./configure # '--with-tirpc=no or --without-tirpc' means try to use legacy glibc, yes by default; --with-gluster means enable the gluster handler, yes by default. $ make -j $ make install
NOTE: Glibc has removed the rpc functions from the 2.26 release. Instead of relying on glibc providing these, the modern libtirpc library should be used instead. For the old glibc version or some distribute Linux we will still use the glibc instead to privide the RPC library. Currently we recommend on Fedora <= 27 and RHEL <= 7 to disable the tirpc.
Prerequisites: this guide assumes that the following are already present
- The kernel or the nbd.ko module must be new enough, which have add the netlink feature supported
- Open 24110 and 24111(nbd-runnerd) 111(rpcbind) ports in your firewall
Daemon: run nbd-runner on the node where you can access the gluster through gfapi
$ nbd-runner help
Usage:
nbd-runner [<args>]
Commands:
help
Display help for nbd-runner command
threads <NUMBER>
Specify the IO thread number for each mapped backstore, 1 as default
rpchost <RUNNER_HOST>
Specify the listenning IP for the nbd-runner server to receive/reply the control
commands(create/delete/map/unmap/list, etc) from nbd-cli, INADDR_ANY as default
iohost <IO_HOST>
Specify the listenning IP for the nbd-runner server to receive/reply the NBD device's
IO operations(WRITE/READ/FLUSH/TRIM, etc), INADDR_ANY as default
version
Show version info and exit.
NOTE:
The RUNNER_HOST and the IO_HOST will be useful if you'd like the control commands
route different from the IOs route via different NICs, or just omit them as default
CLI: you can choose to run nbd-cli from any node where the newer nbd.ko module is availible
$ nbd-cli help
Usage:
gluster help
Display help for gluster commands
azblk help
Display help for azblk commands
ceph help [TODO]
Display help for ceph commands
global help [TODO]
Display help for global commands
version
Display the version of nbd-cli
The handler library name must be "libXXX_handler.so".
struct nbd_handler dummy_handler = {
.name = "Dummy handler",
.subtype = NBD_BACKSTORE_DUMMY,
.cfg_parse = dummy_cfg_parse,
.create = dummy_create,
.delete = dummy_delete,
.map = dummy_map,
.unmap = dummy_unmap,
.get_size = dummy_get_size,
.get_blksize = dummy_get_blksize,
.handle_request = dummy_handle_request,
.load_json = dummy_load_json,
.update_json = dummy_update_json,
}
.name: The name of your handler.
.subtype: You should append a new backstore type in enum handler_t {} in ./rpc/rpc_nbd.x file.
.cfg_parse: This helper should help you to parse the cfgstring received from the nbd-cli command, and setup the dev->priv if needed.
.create: Create one new bacostore storage device/file.
.delete: Delete the backstore storage device/file.
.map: This is called by "nbd-cli map" command, the "nbd-cli map" will map the backstore storage device/file to the NBD device(/dev/nbdX), here you need to make sure that the backstore storage device/file is exist and then open it.
.unmap: When unmapping, you should close the backstore storage device/file.
.get_size: Will get the backstore storage device/file size.
.get_blksize: Will get the backstore storage device/file blksize, you can just return 0 then it will be set as default 512.
.handle_request: This will be called to do the actual IOs, such as READ/WRITE/FLUSH...
.load_json: When the nbd-runner service is starting, it will reload the /etc/nbd-runner/saveconfig.json to setup the device info, you should privide one method to restore the dev->priv private data if needed.
.update_json: All the backstore storage device/file info will be saved to the /etc/nbd-runner/saveconfig.json file, you should privide one method to save this for the dev->priv private data if needed.
NOTE: the create/delete helpers are not must, you can use other tools to create/delete the backstore storage devices/files, and then use the map/unmap to map/unmap them to the NBD devices.
There must have one entry point named "handler_init", it will be:
struct nbd_handler *handler_init(const struct nbd_config *cfg)
{
/* Add your init code here*/
[...]
return &dummy_handler;
}
Gluster is a well known scale-out distributed storage system, flexible in its design and easy to use. One of its key goals is to provide high availability of data. Gluster is very easy to setup and use. Addition and removal of storage servers from a Gluster cluster is intuitive. These capabilities along with other data services that Gluster provides makes it a reliable software defined storage platform.
A unique distributed storage solution build on traditional filesystems
Prerequisites: this guide assumes that the following are already present
- A gluster volume must be created/started first
- Open 24007(for glusterd) port and glusterfs service in your firewall
-
Create a volume in the gluster stoarge cluster.
-
Run the nbd-runner daemon in any of the gluster storage cluster node, or any other node that can access the gluster volume via the gfapi library.
$ nbd-runner [<args>] -
Create one file in the volume by using the gluster cli tool or just use the 'nbd-cli gluster create' tool.
$ mount.glusterfs HOST:/VOLUME /mnt && fallocate -l 1G /mnt/FILEPATHor
$ nbd-cli gluster create <VOLUME/FILEPATH> [prealloc] <size SIZE> <host RUNNER_HOST> -
Map the file created in backstore gluster volume to the NBD device(in local host), you can specify one unmapped /dev/nbdXX or just omit it and then the NBD kernel module will allocate one for you.
$ nbd-cli gluster map <VOLUME/FILEPATH> [nbd-device] [timeout TIME] [readonly] <host RUNNER_HOST> -
You will see the mapped NBD device returned and displayed, or you can check the mapped device info by:
$ nbd-cli gluster list <map|unmap|create|dead|live|all> <host RUNNER_HOST> -
We expose the file in the gluster volume as NBD device using nbd-runner, exporting the target file as block device via /dev/nbdXX
Gluster CLI: the gluster specified cli commands
$ nbd-cli gluster help
Usage:
gluster help
Display help for gluster commands
gluster create <VOLUME/FILEPATH> [prealloc] <size SIZE> [host RUNNER_HOST]
Create FILEPATH in the VOLUME, prealloc is false as default, and the SIZE is valid
with B, K(iB), M(iB), G(iB), T(iB), P(iB), E(iB), Z(iB), Y(iB), RUNNER_HOST will
be 'localhost' as default
gluster delete <VOLUME/FILEPATH> [host RUNNER_HOST]
Delete FILEPATH from the VOLUME, RUNNER_HOST will be 'localhost' as default
gluster map <VOLUME/FILEPATH> [nbd-device] [timeout TIME] [readonly] [host RUNNER_HOST]
Map FILEPATH to the nbd device, as default the socket connection timeout is 30 seconds,
none readonly, RUNNER_HOST will be 'localhost' as default
gluster unmap <nbd-device|VOLUME/FILEPATH> [host RUNNER_HOST]
Unmap the nbd device or VOLUME/FILEPATH, RUNNER_HOST will be 'localhost' as default
gluster list [map|unmap|create|dead|live|all] [host RUNNER_HOST]
List the mapped|unmapped NBD devices or the created|dead|live backstores, all as
default. 'create' means the backstores are just created or unmapped. 'dead' means
the IO connection is lost, this is mainly due to the nbd-runner service is restart
without unmapping. 'live' means everything is okay for both mapped and IO connection,
RUNNER_HOST will be 'localhost' as default
The Azure block driver allows the creation, deletion, and mapping of an NBD device device to an Azure page blob located in an Azure storage account. For more information on Azure page blobs please read https://docs.microsoft.com/en-us/azure/storage/blobs/storage-blob-pageblob-overview.
*Prerequisites:
- You must have the appropriate permissions to access an Azure storage account, container, or individual page blob through a SAS string. If the page blob is not restricted then no SAS string is required. For more information on SAS strings please read https://docs.microsoft.com/en-us/azure/storage/common/storage-dotnet-shared-access-signature-part-1
- Azblk assumes that any page blob is or will be located in a pre-existing container. Azblk does not create containers at this time
-
Run the nbd-runner daemon on a host with network access to the Azure cloud.
$ nbd-runner [<args>] -
Create a new page blob in Azure or add an existing blob by using the 'nbd-cli azblk create' tool. Note when adding an existing blob to the backstore the size indicated on the command line and the actual size of the blob must match.
$ nbd-cli azblk create azblk create <'account.blob.core.windows.net/container/vhd[;option1][;option2']> [prealloc] <size SIZE> [host RUNNER_HOST] [prealloc] <size SIZE> <host RUNNER_HOST>The options are:
- sas=sas_string If a SAS string is required the entire url and options should be enclosed with single quotes.
- lease=lease_id Create a lease for a new page blob or use an existing one if the page blob is pre-existing. A lease id must be in a GUID string format. Leases for pre-existing page blobs must be of an infinite duration.
- http The page blob url is accessed with https by default.
Example:
nbd-cli azblk create 'azure-storage-acct.blob.core.windows.net/test/test.vhd;sas=sv=2018-03-28&ss=bfqt&srt=sco&sp=rwdlacup&se=2019-07-31T22:20:06Z&st=2019-04-17T14:20:06Z&spr=https,http&sig=dEljadfjp923kaf9al09la%ajkhLKSDFer%3D;http' size 2G -
Map the page blob to the NBD device (in the local host). You can specify an unmapped /dev/nbdXX or just omit it and then the NBD kernel module will allocate one for you.
$ nbd-cli azblk map <account.blob.core.windows.net/container/vhd> [nbd-device] [timeout TIME] [readonly] <host RUNNER_HOST> -
You will see the mapped NBD device returned and displayed or you can check the mapped device info by:
$ nbd-cli azblk list <map|unmap|create|dead|live|all> <host RUNNER_HOST>
Azblk CLI: the azblk specified cli commands
$ nbd-cli azblk help
Usage:
azblk help
Display help for azblk commands
azblk create <'account.blob.core.windows.net/container/vhd[;option1][;option2']> [prealloc] <size SIZE> [host RUNNER_HOST]
Create the vhd file in your storage account container, prealloc is false as default, and the SIZE is valid
with B, K(iB), M(iB), G(iB), T(iB), RUNNER_HOST will be 'localhost' as default
Valid options:
sas=SAS_STRING
lease=LEASE_ID
http https is the default
azblk delete <account.blob.core.windows.net/container/vhd> [host RUNNER_HOST]
Delete the vhd file from your storage account container, RUNNER_HOST will be 'localhost' as default
azblk map <account.blob.core.windows.net/container/vhd> [nbd-device] [timeout TIME] [readonly] [host RUNNER_HOST]
Map the vhd to the nbd device, as default the socket connection timeout is 30 seconds,
none readonly, RUNNER_HOST will be 'localhost' as default
azblk unmap <nbd-device|<account.blob.core.windows.net/container/vhd> [host RUNNER_HOST]
Unmap the nbd device or account/container/vhd, RUNNER_HOST will be 'localhost' as default
azblk list [map|unmap|create|dead|live|all] [host RUNNER_HOST]
List the mapped|unmapped NBD devices or the created|dead|live backstores, all as
default. 'create' means the backstores are just created or unmapped. 'dead' means
the IO connection is lost, this is mainly due to the nbd-runner service is restart
without unmapping. 'live' means everything is okay for both mapped and IO connection,
RUNNER_HOST will be 'localhost' as default
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