IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 24 January 2019 (all times are UTC)
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| 09:05 | <nikoh77> hi guys, i have this problem: screen flickering on just one fatclient... orizontal lines are displayed in random mode
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| 09:19 | <alkisg> nikoh77_: what's the output of this? lspci -nn -k | grep -A 2 VGA
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| 09:19 | lspci -nn -k | grep -A 2 VGA | nc termbin.com 9999
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| 09:19 | Actually, this is better:
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| 09:20 | ( lspci -nn -k | grep -A 2 VGA; xrandr ) | nc termbin.com 9999
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| 10:13 | <nikoh77> alkisg: these commands on client or on server?
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| 10:14 | <alkisg> Client
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| 13:18 | <mwalters> alkisg: whenever you could give me some advice on these uefi clients, it would be much appreciated. Thanks!
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| 13:19 | <alkisg> mwalters: heh, you're 7 hours late; I left work! Tomorrow! :)
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| 13:19 | <mwalters> ouch. What is Greece? GMT +5?
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| 13:19 | <alkisg> +3
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| 13:20 | +2 in winter
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| 13:20 | <mwalters> Ah I see
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| 13:22 | Doubt we'll sync up when you're at work, 0821 here (GMT -5). I'll toss my dnsmasq conf up on termbin... if you take a peak at it, thanks. if not, no worries :)
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| 13:23 | Gonna keep throwing stuff at it and see if something sticks
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| 13:28 | <alkisg> The dnsmasq.conf I'm preparing for ltsp6 worked for all my uefi clients, even those that had the issue you're describing
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| 13:28 | So if anything else fails, you'll probably be ok in September when it's out :)
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| 13:28 | <mwalters> lol ;)
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| 16:30 | <JuJUBee> alkisg, I just finished setting up ltsp on a VM on a monster server. Booted a client and took over 5 min to get to desktop. Suggestions?
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| 16:31 | <mwalters> thin/fat? uefi, bios?
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| 16:33 | <JuJUBee> mwalters, not sure, followed http://wiki.ltsp.org/wiki/Installation/Ubuntu never saw option to set thin vs fat Using chrootless method
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| 16:34 | <alkisg> Chrootless supports both thin and fat
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| 16:35 | <JuJUBee> Not certain about uefi vs bios for the ltsp server (VM)
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| 16:35 | <JuJUBee> How do I know which it is using?
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| 16:35 | <mwalters> there he is, I'll let him take over... I was talking more about the client re: uefi/bios
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| 16:35 | <alkisg> At which point did the client go slowly on boot?
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| 16:35 | <mwalters> probably not uefi, considering you just followed the wiki...
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| 16:36 | <alkisg> E.g. did you see it staying 3 minutes at some systemd unit?
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| 16:36 | `systemd-analyze blame` as root on the client might help
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| 16:36 | <JuJUBee> alkisg, the entire process.took 2:05 to get done with initrd.img, 4:07 to get a login screen and 5:45 to get to desktop
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| 16:36 | <alkisg> `dmesg` on the client might help as well
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| 16:36 | 2 minutes to download the initrd?
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| 16:37 | Are you using a 10 mbps hub from 1980? :P
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| 16:37 | <JuJUBee> not entirely. started stopwatch when I pressed power button
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| 16:37 | <mwalters> I experienced that with a uefi client with an old grub image, updating to a newer grub image fixed it
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| 16:37 | (if you don't know what I'm talkinga bout, it's probably not that ;) )
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| 16:37 | <JuJUBee> at 2min 5 sec it was done with initrd.img
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| 16:38 | and no, a cisco Gig switch
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| 16:38 | <mwalters> what hypervisor?
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| 16:39 | <JuJUBee> virtualbox
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| 16:39 | <mwalters> using the epoptes network benchmark would probably rule out network performance issues
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| 16:40 | <JuJUBee> mwalters, do I need to startup all of the clients? or only a couple?
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| 16:41 | <mwalters> oh, did you fire them all up at the same time?
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| 16:41 | * alkisg needs to leave anyway, so mwalters, do the honors please :) | |
| 16:41 | <mwalters> :)
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| 16:42 | if it happens if you just fire one up, then one should be fine
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| 16:43 | <JuJUBee> I only had 1 on at the time of testing.
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| 16:44 | These directions ok? http://www.epoptes.org/documentation/lan-benchmark
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| 16:45 | <mwalters> that's outdated, there's a menu option now
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| 16:45 | one sec, lemme see where it is
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| 16:45 | launch epoptes on the server, then Clients > Network Benchmark in the top menu
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| 16:47 | <JuJUBee> ah ok. Waiting for clients to boot
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| 16:49 | <mwalters> You'll end up with something like this after running it https://i.imgur.com/nKoXAdy.png
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| 16:50 | it'll give you an idea of the real world network performance you're seeing
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| 16:55 | <JuJUBee> gonna take some time now. Someone just shut off the breaker my server is plugged into and my battery in ups is dead
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| 16:55 | <mwalters> :(
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| 16:55 | I'll be in an out for a few more hours
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| 16:56 | <JuJUBee> I appreciate the help. I will report back asic
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| 16:57 | <mwalters> np
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| 17:13 | <JuJUBee> So, the reboot of the bare metal server seems to have fixed the issue.
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| 17:13 | Booted a client to desktop in 1:38
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| 17:13 | Avg up=139.5 down=166.4
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| 17:14 | <mwalters> that doesn't sound unreasonable. Clients are probably defaulting to fat, so they pull the OS down over the network
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| 17:14 | <JuJUBee> They are fat according to epoptes
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| 17:14 | <mwalters> yah
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| 17:14 | <JuJUBee> Im happy now.
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| 17:14 | Do you have time for a few more ?s
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| 17:14 | <mwalters> initrd/vmlinuz will be 100% net dependent... after that, combination of net/cpu on the client (probably still *mostly* net)
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| 17:14 | sure, I'm just munching on lunch
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| 17:15 | <JuJUBee> OK. I used to run 2 servers, 1 LTSP and 2 Firewall/gateway. Any reason to NOT run firewall/gateway on LTSP server?
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| 17:15 | <mwalters> with fat clients? Probably not much reason
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| 17:16 | <JuJUBee> IM a small installation less than 20 workstations
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| 17:16 | <mwalters> last time I did a linux firewall, it was ipchains... back on like... slack6 or something? I've moved on to purpose built hardware, because I don't have the patience for it... maybe it's better with iptables
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| 17:17 | <JuJUBee> I was considering creating a second VM for the fw/gw just to separate the functions
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| 17:17 | <mwalters> when I started here, they were using this with some success: https://www.untangle.com/
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| 17:17 | on a VM
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| 17:17 | I replaced it with a hardware ubiquiti router, though
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| 17:18 | I have no reason to NOT do routing/fw on the ltsp server, other than simple separation of responsibilities stuff... but I'm partial to not doing that with no real concrete reasons ;)
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| 17:19 | Mostly with how "cheap" the ubiquiti stuff is, at least here in the US
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| 17:19 | but I also have 4 offices separated by WAN
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| 17:20 | <JuJUBee> So my setup is JUST for my classroom, not entire school. I only have 10-20 students (usually 10 or less)
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| 17:20 | <mwalters> gotcha, I'm in a business environment, so my usecase is a bit different ;)
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| 17:21 | <JuJUBee> So what handles the dhcp on ltsp now? I used to run a dhcp-server on the ltsp box
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| 17:21 | <mwalters> dnsmasq
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| 17:22 | <JuJUBee> I do have some dhcp reservations I wanted to set up. Any tutorials on dnsmasq you would suggest for this?
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| 17:22 | <mwalters> cat /etc/dnsmasq.d/ltsp-server-dnsmasq.conf
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| 17:22 | https://www.linux.com/learn/intro-to-linux/2018/2/dns-and-dhcp-dnsmasq
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| 17:23 | reservations by mac are at the bottom
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| 17:23 | dnsmasq is ... simpler... and at times a bit more confusing than isc
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| 17:23 | overall it's probably easier, though
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| 17:24 | <JuJUBee> thanks. I had a look earlier at the /etc/dnsmasq.conf but not the ltsp one. I guess that is why my changes didn't work ;)
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| 17:27 | <mwalters> I think I did that too when I was looking at 18.04 ;)
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| 17:32 | <JuJUBee> do you know if I can set specific nameservers for specific hosts by MAC like I did in old dhcp config?
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| 17:32 | I see how to set IP for mac
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| 17:34 | Ah, this might work: option=tag:specialhosts,option:dns-server,8.8.8.8,8.8.4.4
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| 17:34 | <mwalters> I'm not sure on that specifically
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| 17:34 | but yeah, if you can set tags using dhcp-match, then probably
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| 17:35 | you can probably set options for specific macs even
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| 17:35 | but that's not something I've looked into
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| 18:09 | <JuJUBee> spoke too soon. My laptop got the right IP and DNS Servers, but I cannot get the clients to get dns servers only IP
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| 18:10 | I used "nmcli dev show | grep 'IP4.DNS'" on my laptop to show DNS servers, works fine.
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| 18:10 | Used it on client and the client returns nothing
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| 18:23 | <JuJUBee> mwalters, does dnsmasq set the dns servers on the clients? or do the clients point to server and use the servers dns servers?
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| 18:39 | <alkisg> JuJUBee: network manager isn't managing the client dns. One way to set client dns is with DNS_SERVER="xxx yyy zzz" in lts.conf
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| 18:45 | <JuJUBee> alkisg, so in dnsmasq I seem to be able to set IP/DNS for non-ltsp computers but not the ltsp clients. Is that what you mean? I need lts.conf for the clients DNS?
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| 18:45 | <alkisg> There are many ways. This is one of them.
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| 18:45 | The other is to switch to IPAPPEND 2, like I said in the ltsp mailing list earlier today
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| 18:45 | <JuJUBee> OK, thats fine with me as long as I can set a group that doesn't get dns from ltsp
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| 18:46 | <alkisg> Fat clients only read the "sectors" they need, so I had fat clients booting in 12 seconds
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| 18:46 | I.e. they don't download the whole image on boot
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| 18:46 | If they boot in under a minute, your setup is fine
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| 18:47 | If they need more, it can be finetuned
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| 18:52 | <JuJUBee> alkisg, my server shutdown (maintenance shut off a circuit and my battery was dead in ups) and after reboot, clients are booting in under 1:30
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| 18:52 | configured dns servers in lts.conf and all is good now.
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| 18:52 | Thank you.
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| 18:53 | <alkisg> And what are the network benchmark results?
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| 18:57 | <mwalters> alkisg: any chance you could just paste me that dnsmasq config when you're at wrk tomorrow?
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| 19:05 | <JuJUBee> lost internet there for a bit...
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| 19:07 | Thanks for the help alkisg & mwalters Job # 2 awaits... Gotta go.
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