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2555 discussions

NFS locking - solved
by Trevor Cordes 20 Nov '07

20 Nov '07

Finally, I have flock locking (oocalc & perl, et al.) working with NFS. I had to go to NFSv4. NFSv3 appears to not support flock locking even though the docs make it wound like it will work (but they must be assuming you're using v4). NFSv4 is quite the strange beast. You have to make a pseudo-fs and do wacky server-side binding and non-intuitive client-side mounting. For anyone who cares, here's the gist of it: SERVER /etc/fstab /data /nfs/data none bind 0 0 /etc/exports /nfs 192.168.100.1(ro,async,no_subtree_check,no_root_squash,insecure,fsid=0) /nfs/data 192.168.100.1(rw,async,no_subtree_check,no_root_squash,insecure,nohide) fsid=0 is critical for the root, and nohide critical for the /data must run services (on Fedora) nfs rpcidmapd CLIENT 192.168.100.2:/data /data nfs4 rw,bg,hard,intr,nosuid,proto=tcp,timeo=15,retrans=5,rsize=8192,wsize=8192 0 0 note you mount /data not /nfs/data as you would have in v3. must run services (on Fedora) rpcbind rpcidmapd It looks like you don't need to run nfslock (Fedora) service on either as it's part of the nfs core now. I'm open to correction on this. rpcgssd appears to be only required if you want encryption/auth/etc. I could be wrong on this too. portmap doesn't seem to be required? Seems to work without it. I'm still using my custom assigned ports in /etc/sysconfig/nfs and iptables rules and it seems to work. I'm still going to use the async option. Most examples show explicit sync, but in my simple setup I feel the performance gain is worth the risk as my server is RAID6 with good quality hardware and a beefy UPS. Its uptime is currently: ;-) 18:22:08 up 445 days, 18 min, 1 user, load average: 0.00, 0.00, 0.00 My next task is to learn more about "crash recovery" for which many pages say statd is required, but I'm not sure if that's v3 or v4. Sounds useful but not really critical for my simple setup. I don't care if my locks get a bit wonky if my server crashes. If anyone has a comment, let me know.

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Re: [RndTbl] NFS again, please HELP!
by Trevor Cordes 19 Nov '07

19 Nov '07

On Sun, Nov 18, 2007 at 07:33:54PM -0600, Sean Walberg wrote: > Does nfsstat show any errors? I'm no NFS wizard.. It's always just worked > for me Thanks, I hadn't known about that command. Funny how NFS-relevant commands and files seem to be everywhere. The only hints the output gave me was: 1. I'm using v3. Is that ok? Does v3 support locking or are all the net references talkinga bout v4? I recall I'm using v3 because it has better recovery characteristics because it's UDP. 2. The v4 sections of nfsstat output show locking parameters, but v3 does not? Maybe time to try switching up to v4. Doesn't explain why my loopback tests worked (with locking), when they must have been v3! What version does everyone else use?

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NFS again, please HELP!
by Trevor Cordes 19 Nov '07

19 Nov '07

There must be some NFS wizards in the group... I still can't get NFS locking to work between my 2 linux boxen. I took the drastic steps of completely disabling my iptables firewalls on both boxes and setting the policies to ACCEPT. Didn't help. I also set my NFS server config back to 100% stock (mv /etc/sysconfig/nfs /tmp/; service nfs restart; service nfslock restart; service rpcidmapd restart; service portmap restart), remount. Doesn't help. The test code at the bottom never gets past the flock call. oocalc also will never get past the splash screen. I tried exporting and mounting from machine A to machine A (I guess a loopback-ish mount). For both machine A and B, this works fine. The perl code runs and oocalc loads up a NFS'd file instantly. If I mount with nolock in client's fstab, then oocalc starts fine (probably just ignoring the locks). I recently upgrade the client box to Fedora 8 (2.6.23). The server is not easily upgradable and is running 2.6.17. I did a lot of net research and it seems like NFS flock should work on all kernels after 2.6.12. I'm stumped! Please help! Here's my server /etc/sysconfig/nfs (to work with my firewalls) STATD_PORT=32765 STATD_OUTGOING_PORT=32766 MOUNTD_PORT=32767 RQUOTAD_PORT=32764 LOCKD_TCPPORT=32763 LOCKD_UDPPORT=32763 SECURE_NFS=no exports: /data 192.168.100.1(rw,insecure,insecure_locks,async,no_subtree_check,no_root_squash) client: 192.168.100.2:/data /data nfs rw,hard,intr,timeo=10,nosuid,bg,udp,rsize=8192,wsize=8192 0 0 server processes: root 15986 1 0 18:50 ? 00:00:00 rpc.rquotad -p 32764 root 15989 7 0 18:50 ? 00:00:00 [nfsd4] root 15990 1 0 18:50 ? 00:00:00 [nfsd] root 15991 1 0 18:50 ? 00:00:00 [nfsd] root 15992 1 0 18:50 ? 00:00:00 [nfsd] root 15993 1 0 18:50 ? 00:00:00 [lockd] root 15994 7 0 18:50 ? 00:00:00 [rpciod/0] root 15995 1 0 18:50 ? 00:00:00 [nfsd] root 15996 1 0 18:50 ? 00:00:00 [nfsd] root 15997 1 0 18:50 ? 00:00:00 [nfsd] root 15998 1 0 18:50 ? 00:00:00 [nfsd] root 15999 1 0 18:50 ? 00:00:00 [nfsd] root 16002 1 0 18:50 ? 00:00:00 rpc.mountd -p 32767 rpcuser 16039 1 0 18:50 ? 00:00:00 rpc.statd -p 32765 -o 32766 root 16069 1 0 18:50 ? 00:00:00 rpc.idmapd rpc 16087 1 0 18:50 ? 00:00:00 portmap test script: #!/usr/bin/perl use Fcntl ':flock'; # import LOCK_* constants print("Just before opening file.\n"); open(LOCKFILE,">testlockfile") or die "Error: Could not write to lock file: testlockfile: $!\n"; print("Just before locking file.\n"); flock(LOCKFILE,LOCK_EX); print("Just before unlocking file.\n"); flock(LOCKFILE,LOCK_UN); print("All done. File locked and unlocked.\n"); unlink("testlockfile"); exit(0);

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Linux Jails
by Bill Reid 14 Nov '07

14 Nov '07

I enjoyed Shawn's presentation tonight. For those who would like to try out a Linux Jails equivalent see http://openvz.org/ Unlike FreeBSD the OpenVZ kernel mods have not made it into the mainstream Linux kernel. You have to get a kernel from the OpenVZ site. It is certainly not as easy to configure as Jails but there are templates available for various Linux distros to make the job easier. -- Bill

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Canadian Greens add FOSS to election platform
by Ian 14 Nov '07

14 Nov '07

Thought some others might find this interesting. http://www.linux.com/feature/120280 Ian

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Fwd: Links from the 13 Nov meeting
by Gilbert E. Detillieux 14 Nov '07

14 Nov '07

FYI... -------- Original Message -------- Subject: Links from the 13 Nov meeting Date: Wed, 14 Nov 2007 08:24:53 -0600 From: Alan Pollard <apollard(a)lawsociety.mb.ca> To: <info(a)muug.mb.ca> The plastic digital computer that came up in the "earliest computer" duscussion was called a Digi-comp I. Wikipedia article http://en.wikipedia.org/wiki/Digi-Comp_I Photo gallery with instruction manual prints. http://www.csparks.com/gallery/Digi-comp It's been re-created and is available at: http://www.mindsontoys.com/kits.htm?dc1_main.htm --------------------------------------------------- Alan Pollard, P.Eng. Director of Technology The Law Society of Manitoba (204) 926-2016 ---------------------------------------------------

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Environment Canada opens up to open source
by John Lange 13 Nov '07

13 Nov '07

Thought some people might find this interesting: "Environment Canada is using an open source model for its Model of the Environment and Temperature of Roads (METRo) forecasting system, in an effort to help provide the community of meteorologists and road maintainers with accurate forecasting software." http://www.intergovworld.com/article/f8f440a20a01040800b98117d721d2a0/pg0.h…

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Remote connections to Macintoshes
by Glen Ditchfield 10 Nov '07

10 Nov '07

I'm tired of doing phone support. I'd like to connect remotely from one of my Linux/Windows/Macintosh computers, through my Linksys router, through Shaw's network, through MTS's network, to various relative's Macintoshes. Has anyone tried any remote connection software that will work through all of those layers?

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MUUG Meeting, Nov 13, 7:30pm -- Solaris Zones and FreeBSD Jails
by gedetil＠cs.umanitoba.ca 06 Nov '07

06 Nov '07

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, November 13. The meeting topic for this month is as follows: Server Virtualization with Solaris Zones and FreeBSD Jails Shawn Wallbridge will be giving a talk about Server Virtualization using both FreeBSD Jails and Solaris Zones. Shawn will briefly cover what virtualization is, why to use it and then go into details on setting up Jails and Zones. The presenter, Shawn Wallbridge, is a Systems Administrator at Frantic Films. He also runs SynAck Hosting, a small web hosting and server co-location company, in his spare time. The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ********************************************************************** Please note our meeting location: The IBM offices, at 400 Ellice Ave. (between Edmonton and Kennedy). When you arrive, you will have to sign in at the reception desk, and then wait for someone to take you (in groups) to the meeting room. Please try to arrive by about 7:15pm, so the meeting can start promptly at 7:30pm. Don't be late, or you may not get in. (But don't come too early either, since security may not be there to let you in before 7:15 or so.) Non-members may be required to show photo ID at the security desk. Limited parking is available for free on the street, either on Ellice Ave. or on some of the intersecting streets. Indoor parking is also available nearby, at Portage Place, for $3.00 for the evening. Bicycle parking is available in a bike rack under video surveillance located behind the building on Webb Place. ********************************************************************** For more information about MUUG, and its monthly meetings, check out their Web server: http://www.muug.mb.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: http://www.muug.mb.ca/meetings/MUUGmeeting.pdf -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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looking for a gadget
by Theodore Baschak 24 Oct '07

24 Oct '07

Good Evening Folks: Looking for a device like the following: <http://www.apc.com/resource/include/techspec_index.cfm?base_sku=AP7900> except only a single plug, and with a 2nd network port that does passthru like a wired voip phone. I love these power bars, but they're too large to fit into one of those 8x10 NEMA enclosures. Anyone ever even heard of such a beast? Theo

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