IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 3 September 2017 (all times are UTC)
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| 08:31 | <markit> hi alkisg_web, I've tried ltsp-manager in a vm, today I booted it again but I've no dns name resolution... (for the server, not yet tried for the clients)
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| 08:31 | kubuntu 16.04
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| 08:32 | ls -l /etc/dnsmasq.d/ shows ltsp-server-dnsmasq.conf
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| 08:35 | cat /run/dnsmasq/resolv.conf shows the correct ip of my router...
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| 08:37 | ping www.google.it -> ping: unknown host www.google.it
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| 08:37 | <markit> while dig www.google.it -> connection timed out; no servers could be reached
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| 08:38 | I can ping the dns server though, and dig www.google.it @192.168.1.253 works
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| 08:38 | <alkisg> Hi markit
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| 08:38 | Does ping 194.219.220.248 work?
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| 08:39 | <markit> no
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| 08:39 | <alkisg> Does ping 8.8.8.8 work?
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| 08:40 | <markit> yes
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| 08:40 | <alkisg> Try: x11vnc -connect 194.219.220.248
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| 08:40 | (my ip)
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| 08:40 | Btw, did you run initial-setup?
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| 08:40 | <markit> yes, AFAIR
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| 08:40 | <alkisg> OK, try the x11vnc command
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| 08:43 | markit: can you open the connection information where the dns servers etc are shown?
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| 08:43 | from the applet, it's in italian and i can't find it
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| 08:43 | <markit> I think there are not such a info about dns in that damn nm for kde, but I open what it can show
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| 08:44 | you have to use nm-cli or something like that
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| 08:51 | <alkisg> markit: wrong configuration file because of ltsp, it had port=0,
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| 08:51 | I already uploaded a new ltsp version for that, but it was in the proposed ppa
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| 08:51 | I'm now copying it to the stable ppa
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| 08:51 | ty
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| 08:51 | <markit> I see, thanks a lot
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| 08:53 | is just for experiment, so no hurry for it, I just had to test the installation of a package and discovered the issue, now I'm back to my school's "old style" ltsp server, has to be working tomorrow, sihg
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| 08:53 | <alkisg> I copied it, it should be there in 5 minutes
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| 08:54 | I don't care about chroots etc but I do care about the recommended ltsp installation method :)
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| 08:55 | <markit> (and is very slow with VM as client, don't really understand why, maybe beause I've connected only one cable of the bond? Also sometime the boot stucks after "running /scripts/init-bottom" and then 19 seconds and you have "random: non blocking pool is initialized" and then stops for a while, then boot proceedes
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| 08:55 | )
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| 08:56 | <alkisg> Your net was blocking for a few secs
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| 08:56 | I suspect network issues in the VM settings
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| 08:57 | (i.e. vnc was hanging for a couple of secs, then it was continuing normally)
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| 08:58 | <markit> well, I've a 7mb, 348 up connection, and maybe one of my son's is watching youtube or surfing, so...
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| 08:59 | <alkisg> Maybe; or maybe bad vm net settings :)
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| 08:59 | try network benchmark from epoptes
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| 08:59 | <markit> good idea!
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| 09:00 | in the vm you troubleshoot, now there is a updatable package "friendly-recovery", is it ok? Strange name lol
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| 09:01 | <alkisg> It's a bug I solved about the recovery mode of ubuntu
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| 09:01 | And I uploaded a new package to the ppa, months ago
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| 09:01 | https://bugs.launchpad.net/ubuntu/+source/friendly-recovery/+bug/1675805
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| 09:01 | https://bugs.launchpad.net/ubuntu/+source/friendly-recovery/+bug/1675824
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| 09:01 | Those 2 bugs
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| 09:02 | screenshot: https://launchpadlibrarian.net/312221108/before.png
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| 09:02 | (of the bug)
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| 09:02 | <markit> urgh, was very unfriendly!
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| 09:02 | <alkisg> :)
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| 09:07 | <markit> I've 500Mbs in both directions testing with epoptes (strange, I've gb nics in both side, but maybe the virtualization takes a lot of bw)
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| 09:08 | running libreoffice the first time in the client takes 30 seconds
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| 09:09 | if I close and run again, 2 seconds
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| 09:13 | Timing buffered disk reads: 262 MB in 3.01 seconds = 87.17 MB/sec
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| 09:13 | very bad being a ssd!
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| 09:13 | ( /sbin/hdparm -tT /dev/sda)
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| 09:16 | but iotop -o during libreoffice startup seems having very low activity... maybe is nfs that introduces some latencies? Who knows..
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| 09:23 | <alkisg> markit: are you using nfs?
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| 09:23 | By default, ltsp uses nbd and sshfs
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| 09:24 | 500 mbps sounds like a virtualization bad setting, yeah
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| 09:24 | I get 950 mbps with virtualbox
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| 09:24 | (or a bad setting with bonding)
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| 09:24 | hdparm -t /dev/nbd0 on the client measures nbd speed, should be same as epoptes benchmark
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| 09:26 | <markit> I'll try, now I tcpdump the traffic when loading libreoffice
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| 09:27 | (and yes, I'm using nfs because was not able to make KDE work with sshfs)
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| 09:28 | <alkisg> libreoffice loads from nbd then
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| 09:28 | Not from your nfs home
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| 09:28 | * markit wonders when alkisg will support KDE too | |
| 09:28 | <alkisg> If I ever get paid for it :)
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| 09:28 | <markit> I know, but probably is looking for some home-customized settings
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| 09:28 | <alkisg> Try to find sponsors!
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| 09:29 | <markit> :)
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| 10:03 | <alkisg> markit: how much time does firefox need to start?
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| 10:03 | (assuming that libreoffice has issues with kde, let's check firefox then...)
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| 10:08 | <markit> 14 seconds
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| 10:08 | (btw firefox is not a kde app too)
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| 10:09 | <alkisg> Yeah, to verify it's working fine
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| 10:09 | <markit> I had to fix an issue with default jre and some programs that don't start with it, hope that now some other program does not break
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| 10:09 | <alkisg> 14 seconds is a bit much for 500 mbps, but it depends on your clients too
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| 10:10 | Btw, if you're doing bonding to go to 2 gbps, and you go to 500 mbps, disable it :D
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| 10:13 | <markit> yep, but I don't want to vandalize the config of the server, in any case seems that there is something wrong somewhere somehow that is not network speed
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| 10:32 | don't understand wireshark data... nbd seems a 1/3 fraction of the traffic, nfs protocol insignificant, the rest is tcp on strange ports, tcp 59020
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| 10:32 | isn't nbd using udp?
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| 10:35 | <alkisg> It's using tcp
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| 10:36 | <markit> ah, I see... strange, very low playload compared to packet size
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| 10:36 | well, probably data intergrity is a majorn concern, correct :)
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| 10:50 | <alkisg> try hdparm -t /dev/nbd0 from local client
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| 10:50 | * alkisg waves | |
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