Re: NBD swap

Hi Alkis, 

any comment on this? 

Thank you!

---

Giacomo Trovato

Il 22/01/2019 15:41 Giacomo Trovato ha scritto:

> Hi All, 
> 
> any hints?
> I'm more and more convinced that there are problems on the SWAP mechanism (NBD and local) of LTSP.
> 
> ---
> 
> Giacomo Trovato
> 
> Il 21/01/2019 23:25 Giacomo Trovato ha scritto: 
> 
> ...I've also checked the fstab file on my fat clients and there is no partitions mounted! 
> 
> Then I've tried to create a local swap partition on the disk and enabled the local swap on lts.conf, but I see zero swap space with top command.
> 
> ---
> 
> Giacomo Trovato
> 
> Il 21/01/2019 19:02 Giacomo Trovato ha scritto: 
> 
> Hi Alkis,
> 
> I still think to have issues with NBD swap.
> 
> I noticed that my browsers hang only on fat clients with 2 GB ram that use swap.
> 
> I've some fat clients that do not use swap and they do not crash.
> 
> I confirm that I've no folders of the clients in my tmp/nbd-swap.
> 
> I use only one NIC on my server (proxy DHCP mode).
> 
> Thank you!
> 
> ---
> 
> Giacomo Trovato
> 
> Il 17/01/2019 23:14 Vagrant Cascadian ha scritto: 
> On 2019-01-17, Giacomo Trovato wrote: I've set this on my lts.conf:
> 
> _USE_LOCAL_SWAP=False_
> _NBD_SWAP=True_
> 
> So, I assume (as per lts.conf manual) that my fat clients have swap if
> they have less of 800 MB of RAM (but on the manual  NBD_SWAP_THRESHOLD
> is referred to thin client only!).
> 
> But with top command I see swap o my fat clients that have 2GB of RAM! 
> By setting NBD_SWAP=True, you're configuring it to use NBD swap in all
> cases regardless of RAM capacity.
> 
> Then I've this on my syslog on the server:
> 
> _Jan 17 08:29:26 ltspmartini nbd_server[8988]: connect from
> 172.20.18.131, assigned file is /tmp/nbd-swap/172.20.18.131_
> _Jan 17 08:29:26 ltspmartini nbd_server[8988]: Can't open authorization
> file /etc/ltsp/nbd-server.allow (No such file or directory)._
> 
> In fact I don't have nbd-server.allow on my server and there are no
> folders inside tmp/nbd-swap. 
> That is fine. nbd_server checks for the presence of the nbd-server.allow
> file by default, but should behave sanely if it's missing.
> 
> I assume that NBD swap doesn't work and perhaps this is the reason why
> Chromium and Firefox sometimes explode on my fat clients. 
> From a fat client, use open a terminal and run "free -m". If it shows
> any swap at all, swap is working.
> 
> live well,
> vagrant 
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For additional LTSP help,   try #ltsp channel on irc.freenode.net