IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 26 March 2020 (all times are UTC)
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| 02:53 | <map7> Could I use Samba to mount /home on fat-clients (LTSP 20.3) instead of SSHFS/NFS?
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| 02:57 | <vagrantc> yes
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| 02:57 | probably
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| 02:57 | :)
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| 02:58 | <map7> What about using NFSv4 instead of NFSv3?
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| 02:59 | I think the default for the current ltsp 20.3 is to mount using NFSv3 in Debian 10
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| 03:00 | Just wondering if anyone has tried NFSv4 with LTSP or am I going down a rabbit hole here?
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| 03:00 | <vagrantc> i think it requires a working kerberos implementation or something
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| 03:01 | if so, definitely serious rabbit hole adventures
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| 03:02 | <map7> hmmm, ok thanks for the heads up
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| 03:04 | I need coffee before looking at this!
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| 03:54 | vagrantc: kerberos is optional
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| 04:02 | <vagrantc> what would you get with nfsv4 that isn't in nfsv3?
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| 04:03 | <map7> I believe it would be faster
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| 04:03 | https://www.quora.com/What-is-the-difference-between-NFSv3-and-NFSv4
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| 04:03 | <vagrantc> the main feature i've ever heard was authentication and encryption through kerberos
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| 04:03 | <map7> It has parallel high bandwidth access
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| 04:03 | Multiple operations per RPC
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| 04:04 | I'm just testing if this is true in a real world example
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| 04:04 | I'll let you know the results
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| 04:05 | Maybe I'll start a performance page on the ltsp wiki
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| 04:05 | what do you think?
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| 04:05 | <vagrantc> go for it :)
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| 05:13 | <alkisg> I've tested and troubleshooted nfs performance, and I found a very serious bug that affected it since 10+ years, and I managed to get the kernel maintainers to fix it, and I put a workaround in LTSP code until the fix reaches distributions
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| 05:14 | Apart from that, I'm getting full network bandwidth utilization, so I don't think there's much room from improvement, either on nfs3 or 4
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| 05:15 | <map7> alkisg: Fair enough. From my tests of NFSv4 and different rsize & wsize and came to the same conclusion
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| 05:15 | alkisg: Have you tried samba?
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| 05:15 | for mounting /home
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| 05:15 | <alkisg> Without the bug fix, rsize and wsize can affect performance. With the bug fix, it's best to leave them to their default 1M sizes
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| 05:16 | No, I haven't tried samba
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| 05:16 | Since I'm already getting 1 gbps with minimum cpu usage, I don't think it can be optimized by something else
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| 05:17 | sshfs also gives 1 gbps, but wastes cpu and has some issues with file locks, so that one can be optimized, sure
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| 05:17 | but it's the default as it's secure
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| 05:17 | <map7> I'm more worried about lots of little files and random reads
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| 05:17 | I found a big difference in speed with NFSv3/4 & SSHFS, SSHFS was twice as slow in my test
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| 05:17 | <alkisg> NFS is better there as it's a kernel module, so it can finetune whatever it needs from file system cache
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| 05:18 | While sshfs is userspace, based on fuse
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| 05:18 | I think samba is userspace too, not sure
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| 05:18 | IF it applies you to, you may also try "loopback files as home dirs"
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| 05:19 | And then have ext4 inside the loopback file
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| 05:19 | systemd-homed is moving towards that direction, mainly for the encryption though
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| 05:21 | <map7> Ok cool. First I'll check out samba and see what the performance is like there
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| 05:53 | <alkisg> vagrantc: yey, I got upload rights in Ubuntu for ltsp/epoptes :)
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| 06:38 | <vagrantc> alkisg: yay!
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| 06:39 | alkisg: does that mean you can also schedule sync requests from debian?
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| 06:41 | * vagrantc postpones till later | |
| 06:41 | * vagrantc waves | |
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| 06:49 | <alkisg> Yup, it does :)
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| 07:20 | <NecTal> Hello. Can someone tell me why isn't dns hostnames available in thin client? As in i have separate dns server. All hostnames are working in ltsp server but not in thinclient.
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| 07:21 | <alkisg> Does the thin client have the correct dns server and search domain?
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| 07:22 | Compare systemd-resolve --status in server and clients
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| 07:24 | <NecTal> Server and client both have dns server in global section.
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| 07:25 | <alkisg> Tell me a DNS command that returns a different result on the server vs the client
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| 07:25 | E.g.: host mypc
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| 07:26 | <NecTal> When i try to ping some server in my network. In server i can ping like ping msfile. But in client i cannot ping.
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| 07:26 | <alkisg> Use the host command, not ping
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| 07:26 | And tell me the exact output
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| 07:27 | <NecTal> In server host msfile
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| 07:27 | msfile.ms.trafo.ee has address 172.16.1.201
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| 07:27 | And in client
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| 07:27 | Host msfile not found: 2(SERVFAIL)
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| 07:27 | <alkisg> Now in client try: host msfile.ms.trafo.ee
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| 07:28 | <NecTal> Like that it works.
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| 07:28 | <alkisg> (09:21:52 AM) alkisg: Does the thin client have the correct dns server and search domain? ==>
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| 07:28 | so I assume no search domai
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| 07:28 | (09:22:12 AM) alkisg: Compare systemd-resolve --status in server and clients => check search domain there
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| 07:28 | <NecTal> Yeah. Seems like search domain is missing. Where can i define that? ltsp.conf?
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| 07:29 | <alkisg> Normally, in your dhcp server
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| 07:29 | How do your clients get IP, and how does the server get IP?
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| 07:29 | <NecTal> Client gets ip with dnsmasq from ltsp server.
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| 07:29 | <alkisg> 2-nic setup?
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| 07:29 | <NecTal> Yes.
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| 07:29 | <alkisg> Then you need to put searchdomain in dnsmasq
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| 07:30 | I don't know the syntax off-hand, but it should be in the man page
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| 07:30 | <NecTal> Okay. I will take a look.
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| 07:30 | Thank you for your help.
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| 07:30 | <alkisg> np
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| 07:32 | Quick googling says either #domain=thekelleys.org.uk or dhcp-option-force=option:domain-search,internal,maindomain.com
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| 07:45 | NecTal: you might also want to file a bug report in ltsp for this, it would probably be worth it to add it as an example to the default dnsmasq.conf
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| 07:45 | !bug
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| 07:45 | <ltspbot> bug: To file a bug report for upstream LTSP, go to https://github.com/ltsp/ltsp/issues
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| 14:32 | <alkisg> vagrantc: yup, syncing with debian is also included
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| 14:32 | Btw, epoptes has a problem with the new socat, due to a bug in socat,
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| 14:33 | which is fixed in the new bug-fixing upstream socat version,
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| 14:33 | I wonder if it would be easy to ask the debian maintainer to package that new bug fixing version...
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| 14:34 | Specifically, right click on client, open terminal, root locally => the arrow keys etc don't work in that terminal
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| 14:42 | <vagrantc> weird
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| 14:42 | alkisg: doesn't hurt to ask :)
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| 14:42 | alkisg: you could submit a normal bug and mark that it "affects" epoptes
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| 14:43 | <alkisg> Gotcha. I'm waiting for a second feedback from the socat developer; I'll file the bug report after I get it
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| 14:43 | I've no idea how to tag "affects" on the debian bug tracker, but I guess I'll find it
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| 14:49 | <vagrantc> https://www.debian.org/Bugs/server-control#affects
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| 14:49 | include the line "Control: affects -1 epoptes" in your submission email
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| 19:32 | <ArcticWolfen> Hi, I'm trying to install LTSP on Debian buster running on a Pine64. I can't download the LTSP:PPA, this link does not work for me https://ltsp.org/misc/ltsp-ubuntu-ppa-focal.list
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| 19:44 | <alkisg> ArcticWolfen: whoops, please put bionic instead of focal and I'll fix it tomorrow
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| 19:44 | it's the same for now
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| 19:44 | <ArcticWolfen> thanks
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| 19:49 | That did it installing now
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| 19:52 | <alkisg> ArcticWolfen: I managed to omit them in the last push; I fixed it now; it should appear online in a minute
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| 21:38 | <bluejaypop> hello people, I'm looking for a solution for ltsp for example in different city.
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