What I am trying to do is to have my openBSD client (OpenBSD 4.9) auto mount a Linux NFS file system (Scientific Linux 6.1). So far, I am not sure if it is configured correctly.
To get things out of the way, I am able to mount nfs manually:
# mount_nfs -T -3 192.168.15.100:/exports /mnt
# ls -la /mnt
total 52
drwxr-xr-x 7 root wheel 4096 Oct 4 22:42 .
drwxr-xr-x 16 root wheel 512 Nov 26 16:33 ..
drwxrwxr-x 5 _sndio _sndio 4096 Oct 31 21:58 centos
drwxr-xr-x 15 root wheel 4096 Nov 6 09:17 home
drwxr-xr-x 5 root wheel 4096 Oct 31 21:27 sl
drwxr-xr-x 3 root wheel 4096 Nov 19 16:02 sles
drwxr-xr-x 17 503 503 4096 Nov 10 17:37 users
#
So connectivity is not an issue, as far as I can tell.
As per man page, the following is configured in /etc/amd/auto.home:
/defaults type:=nfs;sublink:=${key};opts:=rw,soft,intr,vers=3,proto=tcp
* rhost:=192.168.15.100;rfs:=/exports
In turn, /etc/amd/master is configured as such:
# cat /etc/amd/master
/exports amd.home
Upon reboot, I can it see mount, but curiously enough, instead of the hostname:
amd:24490 0 0 0 100% /exports
From what I understand, amd acts a little different from FreeBSD. Still, I tried to see if I it can automount.
Nope:
ksh: cd: /exports/users - Resource temporarily unavailable
# cd /exports/192.168.15.100/host/users
ksh: cd: /exports/192.168.15.100/host/users - Resource temporarily unavailable
A search in google doesn't help too much – it seems that automounting NFS with OpenBSD is not something that is usually done. Other than this, information is fairly sparse.
I can, of course, always mount is permanently, but I tend to be a bit anal on convention, so no for now. 🙂
Some direction would be appreciation.
(And oh, in case you are a wondering, I tried FreeBSD way of using amd and that hasn't worked out – although I wouldn't mind an explanation of the difference between how FreeBSD implements and how OpenBSD implements it)
UPDATE: After re-writing the map file several times, I got as far as actually communicating with the NFS server with this configuration:
/defaults type:=nfs;rhost:=kerberos.monzell.com;rfs:=/exports;\
sublink:=${key};opts:=rw,nodev,nosuid,soft,intr,tcp,resvport
* ${host}==${rhost};type:=nfs;fs:=${rfs};opts:=rw,nodev,nosuid,soft,intr,tcp,resvport
However, for some reason, it seems that amd will only default to NFS version 2 over udp:
# tcpdump dst kerberos
tcpdump: listening on pcn0, link-type EN10MB
tcpdump: WARNING: compensating for unaligned libpcap packets
20:38:28.558385 openbsd.monzell.com.856 > kerberos.monzell.com.sunrpc: udp 100
20:38:28.559154 openbsd.monzell.com.856 > kerberos.monzell.com.892: udp 96
20:38:30.592761 openbsd.monzell.com.856 > kerberos.monzell.com.nfsd: xid 0x22000000 (NFSv2) 40 null
20:38:33.558107 arp reply openbsd.monzell.com is-at 52:54:00:52:8f:66
I tried various options of forcing it to try to mount as nfsv3 such as:
/defaults type:=nfs;rhost:=kerberos.monzell.com;rfs:=/exports;\
sublink:=${key};opts:=rw,nodev,nosuid,soft,intr,vers=3,proto=tcp,resvport
* ${host}==${rhost};type:=nfs;fs:=${rfs};opts:=rw,nodev,nosuid,soft,intr,vers=3,proto=tcp,resvport
or:
/defaults type:=nfs;rhost:=kerberos.monzell.com;rfs:=/exports;\
sublink:=${key};opts:=rw,nodev,nosuid,soft,intr,vers=-3,proto=tcp,resvport
* ${host}==${rhost};type:=nfs;fs:=${rfs};opts:=rw,nodev,nosuid,soft,intr,vers=3,proto=tcp,resvport
Nothing yet still.
Curious enough, OpenBSD mounts defaults to version 3, so I am not sure why it would start with version 3 in amd. What would be the correct options to pass to automount?
EDIT: As I pointed out, I can point via fstab. For proof, here it is:
kerberos:/exports /mnt nfs rw,nodev,nosuid,tcp,soft,intr 1 1
Filesystem 512-blocks Used Avail Capacity Mounted on
/dev/wd0a 290396 89032 186848 32% /
/dev/wd0k 3240316 1858940 1219364 60% /home
/dev/wd0d 448956 12 426500 0% /tmp
/dev/wd0f 1943196 903596 942444 49% /usr
/dev/wd0g 1105820 346852 703680 33% /usr/X11R6
/dev/wd0h 4387772 256560 3911824 6% /usr/local
/dev/wd0j 2137436 4 2030564 0% /usr/obj
/dev/wd0i 2137436 4 2030564 0% /usr/src
/dev/wd0e 498940 18676 455320 4% /var
amd:26660 0 0 0 100% /net
kerberos:/exports 103212280 66319088 31650312 68% /mnt
As I noted, OpenBSD mounts via version 3 first, so I don't know why under amd, it would not mount via version 3 (tcp) and instead mount via version 2 with udp.
EDIT: As suggested, I attempted the following configurations:
defaults type:=nfs;fs:=${autodir}
# autodir = -a parameter of amd call = amd_mnt in rc.conf = /tmp_mnt
# Be careful with 'umount' and 'unmount' in the following.
remote type:=program;fs:=/mnt;\
mount:="/sbin/mount_nfs kerberos.monzell.com:/exports/";\
unmount:="/sbin/umount /mnt"
That returned
# cd /net/remote
usage: [-23bcdilsTU] [-a maxreadahead] [-g maxgroups]
[-I readdirsize] [-o options] [-R retrycnt] [-r readsize]
[-t timeout] [-w writesize] [-x retrans] rhost:path node
ksh: cd: /net/remote - Operation not permitted
Then this:
defaults type:=nfs;fs:=${autodir}
# autodir = -a parameter of amd call = amd_mnt in rc.conf = /tmp_mnt
# Be careful with 'umount' and 'unmount' in the following.
remote type:=program;fs:=/mnt;\
mount:="/sbin/mount nfs kerberos.monzell.com:/exports/";\
unmount:="/sbin/umount /mnt"
Which returned this:
# cd /net/remote
nfs: realpath kerberos.monzell.com:/exports/: No such file or directory
ksh: cd: /net/remote - Operation not permitted
Nothing yet.
Best Answer
Finally "figured" it out. What I did is to copy an existing FreeBSD map file to /etc/amd/amd.net as follows:
{autodir} is set to the default directory used by amd (which is apparently /tmp_mnt, while ${rhost} is the remote host as specified by the key (which looks for the host name either in DNS or in /etc/hosts file:
On top of that is the host directory.
Then I created a directory in the root as:
/etc/amd/master:
Then I create a host directory under root. Afterwards, it works as expected.
It looks like most communication NFS needs to be through the host, which takes care of the remote mount via NFSv3/TCP. Any attempts to mount remotely via amd directly will default to udp,version 2.
Still don't really understand amd, but I got it working, which means I am mostly there. :)