diod

by chaos

chaos / diod

Distributed I/O Daemon - a 9P file server

221 Stars 43 Forks Last release: about 6 years ago (1.0.23) GNU General Public License v2.0 871 Commits 89 Releases

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diod

diod
is a multi-threaded, user space file server that speaks 9P2000.L protocol.

Building

On Debian

sudo apt-get install build-essential libpopt-dev ncurses-dev automake autoconf git
sudo apt-get install liblua5.1-dev libmunge-dev libwrap0-dev libcap-dev libattr1-dev
./autogen.sh
./configure
make
make check

On Red Hat

sudo yum install epel-release gperftools-devel automake autoconf libattr-devel
sudo yum install lua-devel munge-devel tcp_wrappers-devel libcap-devel
./autogen.sh
./configure
make
make check

On FreeBSD

portmaster security/munge
portmaster lang/lua53
./autogen.sh
./configure
make

See also the remarks below if you want a server that supports impersonation (access=user in v9fs).

Kernel Client

The kernel 9P client, sometimes referred to as "v9fs", consists of the

9p.ko
file system module, and its network transport module,
9pnet.ko
.

Although the kernel client supports several 9P variants, diod only supports 9P2000.L, and only in its feature-complete form, as it appeared in 2.6.38.

Earlier versions of the kernel that do not support 9P2000.L will fail at mount time when version negotiation fails. Some pre-2.6.38 versions of the kernel that have 9P2000.L but still send some 9P2000.u ops may fail in less obvious ways. Use a 2.6.38 or later kernel.

Quick Start

Start the diod server in foreground, with protocol debugging to stderr, no authentication, and one export:

sudo ./diod -f -d 1 -n -e /tmp/9

Mount it using the raw mount command:

sudo mount -t 9p -n 127.0.0.1 /mnt \
    -oaname=/tmp/9,version=9p2000.L,uname=root,access=user

Or (simpler), mount it using diodmount:

sudo ./diodmount -n localhost:/tmp/9 /mnt
Or (even simpler) if diodmount is installed as
/sbin/mount.diod
:
sudo mount -t diod -n localhost:/tmp/9 /mnt

I/O forwarding on clusters:

On I/O node, set up

/etc/diod.conf
according to diod.conf(5), then:
chkconfig diod on
service diod start

On compute node, if I/O node is

fritz42
, add entries like this to
/etc/fstab
:
fritz42:/g/g0  /g/g0         diod  default 0 0

Alternatively, use "zero-config" automounter method: * set

DIOD_SERVERS="fritz42"
in
/etc/sysconfig/auto.diod1
* add
/d /etc/auto.diod
to
/etc/auto.master
Then:
mkdir /d
chkconfig autofs on
service autofs start
ln -s /d/g.g0 /g/g0

Note that at this point diod is only being tested with NFS file systems. Use it with Lustre or GPFS at your own peril - but if you do, please report issues!

Impersonation on FreeBSD

FreeBSD does not support per-thread credentials. If you want a diod server that supports v9fs' access=user, you can: * build diod with

--enable-impersonation
(disabled by default on FreeBSD) * install
net/nfs-ganesha-kmod
from ports (or at least the modules
setthreadgid
,
setthreadgroups
and
setthreaduid
) or from source * before stating diod, load the modules providing additional syscalls:
kldload /path/to/nfs-ganesha-kmod/setthreaduid/setthreaduid.ko
kldload /path/to/nfs-ganesha-kmod/setthreadgid/setthreadgid.ko
kldload /path/to/nfs-ganesha-kmod/setthreadgroups/setthreadgroups.ko

Please read nfs-ganesha-kmod's README first, and use at your own risk.

Support

Use GitHub!

Diod can also be discussed on the v9fs-users mailing list

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