- luv-main - example.com

re : Linux powered drone @ 5pm folllowed by pre-meeting dinner @ Korean
by Brent Wallis 04 Jul '12

04 Jul '12

On Wed, Jul 4, 2012 at 3:57 PM, Russell Coker <russell(a)coker.com.au> wrote: > On Wed, 4 Jul 2012, Brent Wallis <brent.wallis(a)gmail.com> wrote: >> These machines will soon be deployed by police, fire brigades, >> ambulances (why I have no idea) ....navy, army and heavens knows who >> else... > > I wonder how often an ambulance team would have difficulty in finding the > sick/injured person. Being able to look over high fences etc might be helpful > in that regard. ...that makes sense. Didnt think of it that way. Actually, another idea that comes to mind based on your idea would be to fly over a large crowd to establish the direction of a collapsed person....

2 1

connectivity issue Internode to Linode
by Nic Baxter 04 Jul '12

04 Jul '12

I am totally confused by a networking issue I have. I have 3 servers with Linode and am having problems connecting to 2 of them. I have contaced Linode and they insist everything is OK from their end. So the symptons. I cannot connect to nicbaxter.com.au using ssh, web, mail for the last 3 hours or so. I haven't knowingly made any changes to the server. I ran a mtr: [nic@albert ~]$ mtr --report nicbaxter.com.au HOST: albert.nicbaxter.home Loss% Snt Last Avg Best Wrst StDev 1.|-- gateway.nicbaxter.home 0.0% 10 1.3 1.3 1.1 1.9 0.2 2.|-- lns20.mel6.internode.on.n 0.0% 10 19.2 21.5 19.2 29.3 2.9 3.|-- te2-2.cor2.mel6.internode 0.0% 10 20.4 20.7 19.6 22.2 0.7 4.|-- gi8-1-110.bdr1.mel6.inter 0.0% 10 187.3 188.1 187.2 189.5 0.8 5.|-- te2-0-0.bdr1.cbr1.interno 0.0% 10 289.6 237.5 186.9 359.9 67.2 6.|-- te6-0-0.bdr1.syd4.interno 0.0% 10 187.7 188.0 187.0 189.8 0.8 7.|-- te0-0-0.bdr1.syd7.interno 0.0% 10 187.1 200.6 187.1 311.2 38.9 8.|-- po3-0-0.bdr1.sjc2.interno 0.0% 10 189.2 188.0 186.5 189.2 1.1 9.|-- te1-7.bbr01.eq01.sjc01.ne 0.0% 10 188.1 188.0 187.5 188.9 0.5 10.|-- ae7.bbr02.eq01.sjc02.netw 0.0% 10 188.1 188.3 187.6 189.2 0.6 11.|-- ae0.bbr02.cs01.lax01.netw 20.0% 10 193.5 194.4 193.5 195.7 0.8 12.|-- ae7.bbr01.cs01.lax01.netw 0.0% 10 194.6 194.4 193.8 196.2 0.7 13.|-- ae19.bbr01.eq01.dal03.net 10.0% 10 221.4 222.1 221.4 222.5 0.4 14.|-- po31.dsr01.dllstx3.networ 0.0% 10 224.7 224.3 223.6 225.4 0.5 15.|-- te2-4.dsr01.dllstx2.netwo 0.0% 10 225.1 225.3 224.7 226.3 0.5 16.|-- po1.car01.dllstx2.network 0.0% 10 224.3 231.4 224.1 291.5 21.1 17.|-- router1-dal.linode.com 0.0% 10 224.7 226.0 223.7 237.0 3.9 18.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 [nic@albert ~]$ and tcpdump on the server 02:14:37.763601 IP (tos 0x0, ttl 64, id 44588, offset 0, flags [none], proto ICMP (1), length 64) nicbaxter.com.au > ppp118-209-136-214.lns20.mel6.internode.on.net: ICMP echo reply, id 61030, seq 61313, length 44 02:14:38.518998 IP (tos 0x0, ttl 1, id 24801, offset 0, flags [none], proto ICMP (1), length 64) ppp118-209-136-214.lns20.mel6.internode.on.net > nicbaxter.com.au: ICMP echo request, id 61030, seq 386, length 44 02:14:38.519043 IP (tos 0x0, ttl 64, id 44589, offset 0, flags [none], proto ICMP (1), length 64) nicbaxter.com.au > ppp118-209-136-214.lns20.mel6.internode.on.net: ICMP echo reply, id 61030, seq 386, length 44 02:14:38.560710 IP (tos 0x0, ttl 2, id 24802, offset 0, flags [none], proto ICMP (1), length 64) ppp118-209-136-214.lns20.mel6.internode.on.net > nicbaxter.com.au: ICMP echo request, id 61030, seq 642, length 44 I can connect using tor. Also Internode can connect without an issue. I have another server nicbaxter.com also with Linode and everything is fine. Any ideas? Cheers Nic

4 5

BTRFS conversion
by Russell Coker 04 Jul '12

04 Jul '12

I've got some filesystems that I want to convert to BTRFS. They currently are Ext3/4 on Linux Software RAID-1. My plan is to break the RAID, convert one of the constituent devices with the btrfs-convert program, and then add the other one via "btrfs device add". How do I get the new BTRFS device to use RAID-1 for data and metadata? Avi, from your talk I got the impression that this was already possible but the man page doesn't reveal how. I'm using btrfs-tools version 0.19+20120328-3 and kernel 3.2.0-2-amd64 from Debian/Unstable. Do I need to get a newer version of the kernel or the tools? PS Great talk Avi, it was good that you had more than an hour. Could you give another talk in Dec or Feb? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

12 25

Periodic ntp loss of synchronisation problems
by Andrew Worsley 03 Jul '12

03 Jul '12

I am having periodic ntp synchronisation problems. ntp doesn't directly log anything - but I am using nagios3 to track it's synchronisation and I periodically get problems - several times a day. I can't figure out what is causing the loss of synchronisation. Perhaps a burst of ntp packets dropped? But wouldn't ntp log something about this? Any suggestions on logging more info to find the cause or deeper insights into what is going wrong would be appreciated. Andrew Here's the output of commands when things are bad: config(0)# check_ntp_peer -H 127.0.0.1 -w 1.0 -c 2.0 NTP WARNING: Server has the LI_ALARM bit set, Offset 0.210925 secs|offset=0.210925s;1.000000;2.000000; LI_ALARM apparently means not in sync ??? config(1)# ntpq -c rl associd=0 status=c618 leap_alarm, sync_ntp, 1 event, no_sys_peer, version="ntpd 4.2.6p2(a)1.2194-o Sun Oct 17 13:35:13 UTC 2010 (1)", processor="x86_64", system="Linux/2.6.32-5-amd64", leap=11, stratum=3, precision=-23, rootdelay=95.696, rootdisp=263.117, refid=192.189.54.33, reftime=d2bccf2f.4854b34f Sun, Jan 15 2012 15:06:07.282, clock=d2bcd1d6.e9ffea4c Sun, Jan 15 2012 15:17:26.914, peer=16519, tc=10, mintc=3, offset=0.000, frequency=500.000, sys_jitter=35.804, clk_jitter=0.000, clk_wander=91.828 It thinks it's in error by 16s??? config(0)# ntpdc -c kerninfo pll offset: 0 s pll frequency: 500.000 ppm maximum error: 16 s estimated error: 16 s status: 4041 pll unsync mode=fll pll time constant: 10 precision: 1e-06 s frequency tolerance: 500 ppm ntptime gives the same info config(0)# ntptime ntp_gettime() returns code 5 (ERROR) time d2bcd2be.08d3a000 Sun, Jan 15 2012 15:21:18.034, (.034479), maximum error 16000000 us, estimated error 16000000 us ntp_adjtime() returns code 5 (ERROR) modes 0x0 (), offset 0.000 us, frequency 500.000 ppm, interval 1 s, maximum error 16000000 us, estimated error 16000000 us, status 0x4041 (PLL,UNSYNC,MODE), time constant 10, precision 1.000 us, tolerance 500 ppm, Then mysertiously everything is okay: config(0)# ntpdc -c kerninfo pll offset: 0.00998 s pll frequency: 500.000 ppm maximum error: 1.6291 s estimated error: 0.004771 s status: 0001 pll pll time constant: 10 precision: 1e-06 s frequency tolerance: 500 ppm My leap becomes none (no leap_alarm) and things are ok? config(0)# ntpq -c rl associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer, version="ntpd 4.2.6p2(a)1.2194-o Sun Oct 17 13:35:13 UTC 2010 (1)", processor="x86_64", system="Linux/2.6.32-5-amd64", leap=00, stratum=3, precision=-23, rootdelay=95.272, rootdisp=983.007, refid=192.189.54.33, reftime=d2bcd33b.bbc10580 Sun, Jan 15 2012 15:23:23.733, clock=d2bcd852.ec6be1b9 Sun, Jan 15 2012 15:45:06.923, peer=16519, tc=10, mintc=3, offset=13.497, frequency=500.000, sys_jitter=7.251, clk_jitter=4.772, clk_wander=151.809

4 7

Debian repository software
by Toby Corkindale 03 Jul '12

03 Jul '12

Hi, I wonder if I can get some advice from the list? I want to run a little Debian repository -- but I have a requirement which seems to be missing from the software tried so far. I want the repository to maintain multiple versions of the same package. ie. So I could do this: dput my-package_1.00-1_all.deb dput my-package_1.11-1_all.deb dput my-package_2.00-1_all.deb And then on a machine using my repo, be able to say something like: aptitude install my-package (> 1.10 & < 1.99) while on another machine, say: aptitude install my-package (>= 2.00) So far, repo management software I've seen will purge the older version out when you upload a new one. Any thoughts? Thanks, Toby

5 16

CPU clock speed
by Russell Coker 02 Jul '12

02 Jul '12

processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Pentium(R) Dual CPU E2160 @ 1.80GHz stepping : 13 microcode : 0xa3 cpu MHz : 1200.000 cache size : 1024 KB The above is part of the /proc/cpuinfo from a Lenovo desktop PC running Debian/Testing. The below is the same from an NEC PC also running Debian/Testing. Both systems are under light desktop load at the moment, and the above Lenovo system still ran at 1.2GHz even when the MySQL bug I previously mentioned was afflicting it. Any ideas on how I can get the Lenovo system running at full speed? According to sensors(1) the Lenovo has a CPU temperature of just over 60C on both cores while the NEC is at 40C and 45C for it's cores. So it appears that there may be some cooling issue on the Lenovo, this would be partly due to the Lenovo being a compact desktop case while the NEC is a medium tower case with a big vent in the side. It would also be partly due to the fact that the Lenovo system is in the home of someone who keeps their thermostat turned up high. But those factors probably don't explain a 20C difference, so I presume that the Lenovo has some dust. In any case as the first temperature threshold is 86C I presume that's not the cause of the clock difference. processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Pentium(R) Dual CPU E2160 @ 1.80GHz stepping : 13 microcode : 0xa1 cpu MHz : 1795.575 cache size : 1024 KB -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

3 4

apache2 and ssl accelerator
by James Harper 29 Jun '12

29 Jun '12

I have squid functioning nicely as a https accelerator for tomcat6 and IIS7 (Outlook web access and terminal server gateway), and now I want to publish a mantis server that way too. The problem is that squid takes the https request and proxies it as a http request to the server running mantis. apache2 gets the http request and so any hard links in there are prepended with http, which doesn't work (eg browser tries to get css via http which isn't reachable). Squid is adding the front-end-https header to the requests which should tell apache that the front end request was https:// but it doesn't seem to be working. What do I need to do to make apache understand that the user request was https not http? Thanks James

2 1

ipsec.
by Andrew Spiers 29 Jun '12

29 Jun '12

Thought I might play around with IPSEC. It seems there are a few different linux implementations, Strongswan, openswan, racoon (which I think is based on a project called KAME) and I think you can do it with Shorewall. Have I missed any notable implementations? Which is your favourite, and why?

8 11

partx in modern kernels
by James Harper 23 Jun '12

23 Jun '12

I get the following when I try and partx an lvm volume containing a Windows 7 machine: root@hostname:~# partx /dev/vg-fast/virt-capture1-0 # 1: 2048-125827071 (125825024 sectors, 64422 MB) The above is the correct dimensions of the partition. root@hostname:~# partx -a /dev/vg-fast/virt-capture1-0 partx: /dev/vg-fast/virt-capture1-0: error adding partition 1 The interesting bits from an strace: open("/sys/dev/block/254:26", O_RDONLY) = 3 newfstatat(3, "partition", 0x7ffff554a660, 0) = -1 ENOENT (No such file or directory) openat(3, "dm/uuid", O_RDONLY) = 4 fcntl(4, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE) fstat(4, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f83f10b0000 lseek(4, 0, SEEK_CUR) = 0 read(4, "LVM-QUSNncQ5s6iHG1gMD7g9dNFQGV6Y"..., 4096) = 69 close(4) = 0 munmap(0x7f83f10b0000, 4096) = 0 close(3) = 0 ... stat("/dev/vg-fast/virt-capture1-0", {st_mode=S_IFBLK|S_ISVTX|0660, st_rdev=makedev(254, 26), ...}) = 0 open("/dev/vg-fast/virt-capture1-0", O_RDONLY) = 3 fadvise64(3, 0, 0, POSIX_FADV_RANDOM) = 0 fstat(3, {st_mode=S_IFBLK|S_ISVTX|0660, st_rdev=makedev(254, 26), ...}) = 0 uname({sys="Linux", node="keechvs3", ...}) = 0 ioctl(3, BLKGETSIZE64, 0x12ef0e0) = 0 ioctl(3, CDROM_GET_CAPABILITY, 0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(3, 0, SEEK_SET) = 0 read(3, "3\300\216\320\274\0|\216\300\216\330\276\0|\277\0\6\271\0\2\374\363\244Ph\34\6\313\373\271\4\0"..., 1024) = 1024 ioctl(3, BLKSSZGET, 0x12ef0f8) = 0 ioctl(3, BLKPG, 0x7ffff554b880) = -1 EINVAL (Invalid argument) ... close(3) Any suggestions? Kernel is debian 3.2.0-2-amd64 Thanks James

1 1

Re: [luv-announce] Speakers, please?
by Russell Coker 22 Jun '12

22 Jun '12

On Thu, 21 Jun 2012, lev(a)levlafayette.com wrote: > This is a general pitch to all members of LUV on whether they would > consider stepping up to the speaker's plate for the community. So what happened to all the people who answered that survey about speaking at a LUV meeting? Maybe we should have such polls ask people for their email address... -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

3 2