IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 5 August 2019 (all times are UTC)
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| 07:50 | <markit> hi alkisg :) Do you have time now to try to install ltsp-pnp under Kubuntu?
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| 08:32 | <alkisg> Hey markit
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| 08:32 | Sure, I'm here
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| 15:31 | <sutula> Looking for opinions: I have an LTSP server still running 16.04.6. I waited to upgrade this one until all the dust settled. Any chance I can just "do-release-upgrade" and half-expect LTSP to keep working on the other side of the upgrade?
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| 15:32 | <alkisg> sutula: sure, as long as you add the greek schools ppa after the upgrade
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| 15:32 | <sutula> alkisg: I think it may be there already, but does that go away in an upgrade?
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| 15:33 | <alkisg> Yes, do-release-upgrade removes all outside sources, and you need to re-add them
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| 15:33 | <sutula> OK, thanks so much! That'd have been a mystery to me.
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| 15:33 | <alkisg> np
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| 15:53 | <||cw> it does tell you that it's disabling them
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| 18:52 | <eddytv> Question: are there known DNS issues with using Ubuntu 18.04.2 as an LTSP client? Even though "/run/net-eth0.conf" on the clients has a valid "DNS_SERVER" entry, /etc/resolv.conf is pointing to /run/resolvconf/resolv.conf which contains "nameserver 127.0.0.53"
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| 18:52 | <mwalters> I think it's more about how systemd-resolved works
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| 18:53 | let me see if I can remember how I fixed all this zaniness...
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| 18:53 | `systemd-resolve --status` will show you what dns server you're *really* using
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| 18:54 | <eddytv> Thanks. I found quite a few articles on "fixing" this issue on a "real" 18.04 install, but nothing seems to apply to when it's an LTSP client.
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| 18:55 | <mwalters> Are you using a chrootless install?
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| 18:55 | <eddytv> Right... and under "Link 2 (eth0)", there is no "DNS Servers" line
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| 18:56 | No, 18.04 is in a chroot
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| 18:56 | <mwalters> I ended up adding `DNS_SERVER="server1 server2 etc` after getting super fed up with how ubuntu handles dns now ;)
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| 18:57 | <alkisg> Do you have the greek schools ppa in the chroot?
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| 18:57 | <eddytv> Yes indeed
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| 18:57 | <mwalters> eer... `DNS_SERVER="server1 server2 server3"` to lts.conf
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| 18:57 | but in my case, I wanted the dns servers to NOT be the ltsp server
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| 18:58 | I'm sure alkisg can show you the *right* way... I'm sure my config is super goofed up thanks to my tinkering ;)
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| 18:59 | But works after sufficient amounts of bubblegum and tape
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| 18:59 | <eddytv> Oops, I have to run to a meeting at the top of the hour. I'll be back in about 30 minutes. I'd appreciate any pointers. I spent a bunch of time this weekend trying to track down the issue with no luck.
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| 18:59 | * alkisg will be back in 30 too :D | |
| 19:10 | <section1> i solve this disabling systemd resolver and remove the /etc/resolv.conf link and making a real resolv.conf file with the correct dns of my lan
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| 19:10 | <alkisg> !ipappend
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| 19:10 | <ltsp> ipappend: o temporarily solve DHCP problems in the initramfs, try putting IPAPPEND 3 after the APPEND line in /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default. More info: http://www.syslinux.org/wiki/index.php/SYSLINUX#IPAPPEND_flag_val_.5BPXELINUX_only.5D
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| 19:11 | <alkisg> eddytv: so, ltsp now defaults to "ipappend 3", which means that it doesn't really use the server dhcp offer, but it's reusing the ip from the pxe stack
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| 19:11 | This in turn means that DNS is ignored, and you need to put DNS_SERVER in lts.conf,
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| 19:12 | unless you revert to using IPAPPEND 2, in which case the usual second dhcp request will fetch the DNS server
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| 19:12 | although, hmm, this doesn't explain why you see it in /run/net-eth0.conf
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| 19:16 | eddytv: so anyway, when you're ready, pastebin the output of the following commands on the client:
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| 19:16 | cat /proc/cmdline
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| 19:16 | getltscfg -a | grep DNS
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| 19:16 | ls -l /etc/resolv.conf
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| 19:16 | cat /run/systemd/resolve/resolv.conf
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| 19:17 | These should be enough to locate the issue...
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| 19:32 | <eddytv> I definitely had to add "IPAPPEND 2" to "update-kernels.conf". That was another problem I ran in to, but I ended up finding a discussion about it in the LTSP mailing list archives.
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| 19:37 | I'll have the output of those commands in a few; have to deal with something else that just came up first. Thanks!
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| 20:31 | <eddytv> @alkisg: Here's the output of those commands: https://privatebin.net/?7585562224cec4c1#AaPNm9mWdkA4KCUR42Z2Advajm67StuZrhsaVKwEQRSg
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| 20:38 | <alkisg> eddytv: uninstall resolvconf, and let ubuntu use the default systemd-resolved service
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| 20:38 | This is what the symlink should say: lrwxrwxrwx 1 root root 39 Ιουλ 19 11:10 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf
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| 20:39 | If you didn't manually install resolvconf and broke this, it would be interesting to find out what pulled resolvconf; it's not installed by default
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| 20:40 | Anyways, it's late here, /me waves...
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| 20:40 | <eddytv> Hmm. This was an update from an earlier ubuntu release
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| 20:41 | In any case, thanks for the help! I will give it a try.
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| 20:56 | <eddytv> So, after removing resolvconf, the client now has an actual /etc/resolv.conf file (that is, it's not a symlink) which contains "# Generated by LTSP" and has the nameserver that (appears to be) from /run/net-eth0.conf... and DNS works. /shrug? It's progress...
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