IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 1 March 2021 (all times are UTC)
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| 17:04 | <alkis[m]> Hi from matrix
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| 17:04 | <alkisg> alkis[m]: talking to yourself? :P
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| 19:44 | <bobby90> @alksig - are you here?
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| 19:44 | <alkisg> bobby90: yup
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| 19:44 | <bobby90> unbelieveable... what TZ are you in? ;)
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| 19:44 | <alkisg> Greece, UTC+2 now
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| 19:45 | <bobby90> so, kali spera
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| 19:46 | <alkisg> To you too :)
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| 19:46 | <bobby90> just a small updae for you... I'm the guy where the KDE desktopsetings got corrupted through the LTSP.
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| 19:47 | <alkisg> Ah right, so what happenned?
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| 19:48 | <bobby90> I used Eclipse on the LTSP client, and on the next day, my .project file was gone. I also noticed some strange behaviour on the client. Maven builds were slow as hell and sometimes broke with some strange error message. This made me do some research.
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| 19:49 | I found on some (still rare) sources that some people consider sshfs less reliable than nfs, at least when load is high.
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| 19:50 | So my next step is to give nfs for /home a try. I will observe things for some time and eventually come back here and tellyou the story.
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| 19:51 | <alkisg> bobby90: I'm aware of certain file system functions that are not available on sshfs
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| 19:51 | That's why we're using nfs here; more stable and faster
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| 19:51 | But I haven't heard anything about data corruption
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| 19:51 | And if one wants security, I'd advice nfs over wireshark, which protects everything
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| 19:52 | (or nfsv4 + kerberos, which has integrated security)
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| 19:52 | <bobby90> Is that security thing a matter of encryption or authentication? which one is sacrificed on nfs?
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| 19:53 | <alkisg> Both
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| 19:53 | A person with a laptop in your LAN could see everything, if he knows how
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| 19:53 | <bobby90> So, someone who gains access to my network could access all user directories?
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| 19:53 | <alkisg> (i.e. local root account)
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| 19:53 | Yes
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| 19:53 | That's why sshfs is the default
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| 19:53 | <bobby90> I see.
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| 19:53 | <alkisg> (as wireshark is a new comer now, it wasn't available in the past)
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| 19:54 | <bobby90> Wireshark is a network analyzing tool to me... Is there something else with the same name?
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| 19:55 | <alkisg> wireguard, sorry, I'm frequently confusing the name
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| 19:55 | <bobby90> Ok, thanks
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| 19:55 | <alkisg> It's an in-kernel vpn
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| 19:55 | <bobby90> Interesting...
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| 19:55 | <alkisg> (old age... :D)
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| 19:55 | <bobby90> ;)
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| 19:55 | <alkisg> If you want to verify the sshfs issue, you could also try sshfs home in a standalone installation, without involving ltsp; if it happens there too, you'll know that sshfs is to blame
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| 19:56 | sshfs also has a few options with workarounds for known issues, but you'd need to investigate which one is that harms maven; if that's actually the case
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| 19:56 | <bobby90> Difficult. I cannot reproduce the problem.
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| 19:57 | I have sshfs on a Raspberry Pi that runs my Jenkins instance. It does Maven builds with no problem so far.
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| 19:58 | However, much slower, of course. Some 30 seconds for one of my projects on my deelopment machine, 5 minutes on the Pi.
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| 19:59 | The sshfs mounts a share from a Synology Diskstation.
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| 20:01 | So I'm still wondering if this is an sshfs problem or maybe an sshfs-on-ubuntu-20.04 problem.
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| 20:02 | I'll keep investigating...
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| 20:08 | <alkisg> I've rarely seen such issues to be distro-specific
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| 20:09 | <bobby90> Ok
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| 20:12 | I have just hat a look at my sshfs configuration on the Pi. There is nothing special. On the other hand, the sshfs is just used to expose a git repository. So it's a rad-mostly connection. Eclipse access to a project will run at some higher scale.
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| 20:19 | Where would I put options to be used by sshfs?
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| 20:26 | <alkisg> bobby90: thousands of users are using sshfs without that issue; so IF that's the problem, it's related to the specific load
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| 20:26 | You can put it in SSH_OPTIONS in ltsp.conf
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| 20:27 | <bobby90> the server or clients section?
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| 20:27 | <alkisg> The clients section
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| 20:30 | <bobby90> Do I need to restart something after a change?
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| 20:30 | Or just log off and on again?
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| 20:43 | <alkisg> ltsp initrd, then client reboot
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