IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 23 July 2019 (all times are UTC)
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| 07:05 | <maddiekool> Hi Guys,
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| 07:06 | I have setup LTSP on ubuntu 18.04 Server then installed XFCE4-GUI for the server , everything looks good till 10 users then the system just start freezing.
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| 07:07 | <alkisg> maddiekool: are you using thin or fat clients?
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| 07:07 | <maddiekool> Any new users are unable to connect and the old ones start getting their firefox and other applications start freezing
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| 07:07 | <alkisg> How much RAM and which exact CPU model do your clients have?
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| 07:07 | <maddiekool> We are using thin clients - Fujitsu S550
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| 07:07 | with 2GB Ram each
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| 07:08 | <alkisg> And how much RAM do you have on the server?
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| 07:08 | And which CPU on the server?
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| 07:08 | <maddiekool> And server is a Poweredge R510 2CPU Xeon
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| 07:08 | and RAM is 32 GB
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| 07:08 | <alkisg> The client cpu is weak, 267 score, https://www.cpubenchmark.net/cpu.php?cpu=AMD+Sempron+200U&id=1588
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| 07:09 | <maddiekool> 2x Intel Xeon X5660
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| 07:10 | <alkisg> 7569 score, https://www.cpubenchmark.net/cpu.php?cpu=Intel+Xeon+X5660+%40+2.80GHz&id=1305
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| 07:10 | <maddiekool> alkisg with 5 users connected , everything works perfectly
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| 07:10 | <alkisg> When you have 9-10 users connected, how much RAM does the server use, what's the output of `free`?
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| 07:11 | Also, what kind of networking, is it gigabit?
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| 07:11 | <maddiekool> as soon as we hit 10 it start freezing up
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| 07:11 | <alkisg> It might just be out of memory
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| 07:11 | <maddiekool> when 10 user were connected RAM usage was 8GB
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| 07:11 | and yes gigabit network
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| 07:11 | <alkisg> What about `top`, did it show a lot of CPU being used?
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| 07:12 | If it works for 5 and crashes for 10, it sounds like a bottleneck, something's getting stressed
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| 07:12 | Which is usually ram, cpu, or network
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| 07:12 | <maddiekool> top looked good with a load average of 4-5
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| 07:12 | <alkisg> Nowadays we're deprecating thin client support, to avoid stressing the server; we only recommend fat clients now
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| 07:13 | <maddiekool> we also change the ulimit -n
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| 07:13 | from 1024 to 65K
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| 07:13 | <alkisg> Doesn't "load average of 4-5" mean "100% cpu" on a quad core system?
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| 07:14 | Do you have LDM_DIRECTX=True in lts.conf?
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| 07:14 | <maddiekool> it's a 24 core system
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| 07:14 | <alkisg> ok
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| 07:14 | The next would be to monitor `iftop`
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| 07:15 | And check if it's 100% of network bandwidth used there
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| 07:15 | <maddiekool> okay `iftop ` will do that
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| 07:15 | and revert back
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| 07:15 | <alkisg> Btw, this is 64bit installation, not 32bit, right?
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| 07:15 | <maddiekool> we also cannot then SSH to the server
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| 07:16 | <alkisg> What's the output of `dpkg --print-architecture` ?
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| 07:16 | <maddiekool> when 10 ore more users are connected , it's a 64 Bit
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| 07:16 | <alkisg> Try also `dmesg` and `journalctl -e`
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| 07:16 | To see if the server reports any errors in the logs
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| 07:16 | <maddiekool> we were getting dbus error messages and hence increased the ulimit -n
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| 07:17 | <alkisg> ssh doesn't use dbus though
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| 07:17 | <alkisg> So it wouldn't justify the inability to login via ssh
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| 07:17 | <maddiekool> hmmm
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| 07:18 | We also got "Shell request Failed on Channel 0"
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| 07:18 | when trying to SSH
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| 07:19 | <alkisg> Try to `tail /var/log/auth.log` then as well
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| 07:19 | Btw, even though your client CPUs are weak, it might be better to use them as fat clients
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| 07:19 | Depending on their graphics cards, they might be able to watch youtube fullscreen, without any strain to the server at all
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| 07:19 | <alkisg> (fat clients meaning still netbooted, but with a "fat" ltsp chroot)
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| 07:20 | <maddiekool> `[session uid=5361 pid=2519] Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1`
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| 07:20 | also this in the logs
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| 07:20 | I will switch to fat clients and check this
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| 07:21 | <alkisg> You can also try with a live usb ubuntu stick
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| 07:21 | If it works well enough, it'll have the same performance as ltsp fat client too
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| 07:21 | <maddiekool> Also `LDM_DIRECTX=True` does exist
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| 07:22 | <alkisg> OK, this saves some CPU; but the network is still strained a lot
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| 07:22 | <maddiekool> the Main switch is 1GB and some switches are 100M
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| 07:23 | Let me boot up as fat client
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| 07:23 | <alkisg> Then you might be also suffering from the flow control issue, you can test with epoptes
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| 07:23 | !lan
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| 07:23 | <ltsp> I do not know about 'lan', but I do know about these similar topics: 'lan-benchmark'
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| 07:23 | <alkisg> !lan-benchmark
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| 07:23 | <ltsp> lan-benchmark: If you have a mixed-speed network (gigabit server<=>switch connection, and 100 Mbits/sec clients<=>switch connections), then you might suffer from the !flow-control issue. To benchmark your LAN with epoptes, see http://www.epoptes.org/documentation/lan-benchmark
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| 07:26 | <maddiekool> Thanks for the promt reply , I too think its a network issue as the system looks good and powerful enough
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| 07:27 | will benchmark lan
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| 09:14 | <maddiekool> Hi
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| 09:14 | Guys
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| 09:14 | So i changed the switch at the enpoints to 1GB
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| 09:14 | and still facing issues with firefox dropping out and some users unable to connect
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| 09:16 | `
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| 09:16 | I find this in the syslog
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| 09:17 | `ltspmru dbus-daemon[1357]: [session uid=5635 pid=1346] Failed to activate service org.a11y.Bus: Failed to fork (Resource temporarily unavailable)
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| 09:17 | also this
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| 09:21 | <alkisg> maddiekool: focus on the ssh login, not on various programs that fail for consequent reasons
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| 09:21 | ssh should produce the base of the issue
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| 12:59 | <kiseiju> hello, someone have experience with odroid and ltsp?
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| 13:11 | <mwalters> There's a few people around with experience with raspi at least
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| 13:11 | !ask
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| 13:11 | <ltsp> ask: Don't ask to ask a question, simply ask it, and if someone knows the answer, they'll respond. Please hang around for at least a full hour after asking a question, as not everybody constantly monitors the channel.
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| 13:28 | <mwalters> ops, he wasn't here anymore... maybe I should stop filtering part messages :D
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| 17:29 | <alkisg> !install
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| 17:29 | <ltsp> install: http://wiki.ltsp.org/wiki/Installation/Ubuntu for Ubuntu, or http://wiki.ltsp.org/wiki/Installation for other distributions
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| 19:13 | <Chakal77> Hey everyone!
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| 19:16 | I've already build with sucess a LTSP server with only VMware Horizon Client booting and showing up with the help of people from here (btw Thanks!) and from this GitHub old project (https://github.com/leschartreux/ltsp-vmview)
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| 19:18 | I don't know if here is the right place to ask, but now i want to build the same client as a fat-client like, but withou the LTSP server, just the same thing, but without the ltsp server running.
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| 19:18 | I've already opened the scripts from github project but i don't know much about shell script.
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| 19:23 | I've already opened the scripts from github project but i don't know much about shell script.
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| 19:25 | What i want to do it's just make a fat-client like, without LTSP, just the ubuntu server with MATE Desktop bringing up only the vmware horizon client, even without panels and so.
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| 19:39 | <alkisg> Chakal77: where will the clients boot from, the local disk?
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| 19:39 | Or do you mean they'd boot from the server first, and then run from ram?
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| 22:25 | <Chakal77> Now i'm trying to make them boot from hard disk
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| 22:25 | But in the same way this github project does
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| 22:25 | Withou the ltsp server
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| 22:26 | I just want a ubuntu server with gui that just boots only with vmware horizon client windows
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| 22:26 | Nothing more
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