IRC chat logs for #ltsp on irc.freenode.net (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?
02:57
<vagrantc>
yes
02:57
probably
02:57
:)
02:58
<map7>
What about using NFSv4 instead of NFSv3?
02:59
I think the default for the current ltsp 20.3 is to mount using NFSv3 in Debian 10
03:00
Just wondering if anyone has tried NFSv4 with LTSP or am I going down a rabbit hole here?
03:00
<vagrantc>
i think it requires a working kerberos implementation or something
03:01
if so, definitely serious rabbit hole adventures
03:02
<map7>
hmmm, ok thanks for the heads up
03:04
I need coffee before looking at this!
03:54
vagrantc: kerberos is optional
04:02
<vagrantc>
what would you get with nfsv4 that isn't in nfsv3?
04:03
<map7>
I believe it would be faster
04:03
https://www.quora.com/What-is-the-difference-between-NFSv3-and-NFSv4
04:03
<vagrantc>
the main feature i've ever heard was authentication and encryption through kerberos
04:03
<map7>
It has parallel high bandwidth access
04:03
Multiple operations per RPC
04:04
I'm just testing if this is true in a real world example
04:04
I'll let you know the results
04:05
Maybe I'll start a performance page on the ltsp wiki
04:05
what do you think?
04:05
<vagrantc>
go for it :)
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
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
05:15
<map7>
alkisg: Fair enough. From my tests of NFSv4 and different rsize & wsize and came to the same conclusion
05:15
alkisg: Have you tried samba?
05:15
for mounting /home
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
05:16
No, I haven't tried samba
05:16
Since I'm already getting 1 gbps with minimum cpu usage, I don't think it can be optimized by something else
05:17
sshfs also gives 1 gbps, but wastes cpu and has some issues with file locks, so that one can be optimized, sure
05:17
but it's the default as it's secure
05:17
<map7>
I'm more worried about lots of little files and random reads
05:17
I found a big difference in speed with NFSv3/4 & SSHFS, SSHFS was twice as slow in my test
05:17
<alkisg>
NFS is better there as it's a kernel module, so it can finetune whatever it needs from file system cache
05:18
While sshfs is userspace, based on fuse
05:18
I think samba is userspace too, not sure
05:18
IF it applies you to, you may also try "loopback files as home dirs"
05:19
And then have ext4 inside the loopback file
05:19
systemd-homed is moving towards that direction, mainly for the encryption though
05:21
<map7>
Ok cool. First I'll check out samba and see what the performance is like there
05:53
<alkisg>
vagrantc: yey, I got upload rights in Ubuntu for ltsp/epoptes :)
06:38
<vagrantc>
alkisg: yay!
06:39
alkisg: does that mean you can also schedule sync requests from debian?
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.
07:21
<alkisg>
Does the thin client have the correct dns server and search domain?
07:22
Compare systemd-resolve --status in server and clients
07:24
<NecTal>
Server and client both have dns server in global section.
07:25
<alkisg>
Tell me a DNS command that returns a different result on the server vs the client
07:25
E.g.: host mypc
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.
07:26
<alkisg>
Use the host command, not ping
07:26
And tell me the exact output
07:27
<NecTal>
In server host msfile
07:27
msfile.ms.trafo.ee has address 172.16.1.201
07:27
And in client
07:27
Host msfile not found: 2(SERVFAIL)
07:27
<alkisg>
Now in client try: host msfile.ms.trafo.ee
07:28
<NecTal>
Like that it works.
07:28
<alkisg>
(09:21:52 AM) alkisg: Does the thin client have the correct dns server and search domain? ==>
07:28
so I assume no search domai
07:28
(09:22:12 AM) alkisg: Compare systemd-resolve --status in server and clients => check search domain there
07:28
<NecTal>
Yeah. Seems like search domain is missing. Where can i define that? ltsp.conf?
07:29
<alkisg>
Normally, in your dhcp server
07:29
How do your clients get IP, and how does the server get IP?
07:29
<NecTal>
Client gets ip with dnsmasq from ltsp server.
07:29
<alkisg>
2-nic setup?
07:29
<NecTal>
Yes.
07:29
<alkisg>
Then you need to put searchdomain in dnsmasq
07:30
I don't know the syntax off-hand, but it should be in the man page
07:30
<NecTal>
Okay. I will take a look.
07:30
Thank you for your help.
07:30
<alkisg>
np
07:32
Quick googling says either #domain=thekelleys.org.uk or dhcp-option-force=option:domain-search,internal,maindomain.com
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
07:45
!bug
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
14:32
Btw, epoptes has a problem with the new socat, due to a bug in socat,
14:33
which is fixed in the new bug-fixing upstream socat version,
14:33
I wonder if it would be easy to ask the debian maintainer to package that new bug fixing version...
14:34
Specifically, right click on client, open terminal, root locally => the arrow keys etc don't work in that terminal
14:42
<vagrantc>
weird
14:42
alkisg: doesn't hurt to ask :)
14:42
alkisg: you could submit a normal bug and mark that it "affects" epoptes
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
14:43
I've no idea how to tag "affects" on the debian bug tracker, but I guess I'll find it
14:49
<vagrantc>
https://www.debian.org/Bugs/server-control#affects
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
19:44
it's the same for now
19:44
<ArcticWolfen>
thanks
19:49
That did it installing now
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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