November 2007 - Roundtable

Mac VNC
by Kevin Scott 18 Dec '07

18 Dec '07

> However, System Preferences on my Mom's Mac helpfully reports that "Others > can > manage your computer using the address 10.64.x.y", which doesn't do me any > good. Is there a way to get an IP address that I can from Shaw's network? > > > ------------------------------ 10.64. indicates Private IP address, and a router being used? so Port Forwarding in that router should be what you need, but thats a Network answer, I do not know alot about how mac's operate. I imagine that there are much more Mac knowledgable people around then myself... Kevin

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The Day The Routers Died
by Bill Reid 28 Nov '07

28 Nov '07

This is a video of a song performed at the closing plenary of RIPE 55. About the slowness of migrating to IPv6 and running out of addresses in IPv4. http://www.flixxy.com/routers-song.htm Enjoy, Bill

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Used equipment from IBM.
by Steve Moffat 20 Nov '07

20 Nov '07

Sorry if this is viewed as spam, but I thought some might be interested. I actually bought one of these used systems for the family earlier this year. It looks like brand new, and has been working great (ymmv though). I figured the price was pretty good considering you get a M$ license. Shipping from Toronto was free. To take advantage of this you will need my employee number (020842). If you'd rather see the site for new equipment, which also has "family and friends" offers. Let me know. And no, I don't make any money or get any credit if you avail yourself of this offer. ;-) IBM Employees, Family & Friends! IBM Certified Used Desktops from $233! T23 Notebooks from $276! ..while supplies last.. 15% off web price for IBM Canada Employees, Family & Friends! - Warranties up to 6 months IBM Certified Used Equipment Is refurbished and tested to IBM standards English http://www.ibm.com/shop/ca/en/epp French http://www.ibm.com/shop/ca/fr/epp Steve Moffat IBM Global Services sjm(a)ca.ibm.com (204)792-3245

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NFS locking - solved
by Trevor Cordes 19 Nov '07

19 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 18 Nov '07

18 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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