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List: ltsp-discuss
Subject: Re: [Ltsp-discuss] Sleep when mounting root filesystem
From: Jake Schroeder <akejay () freeshell ! org>
Date: 2003-02-26 17:12:20
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Shoot, I don't know how auto-generated hostnames work.
The best solution is to do an inventory of your machines and add them to
the right files. LTSP has too many neat features that are based on the
hostname. Meanwhile, you'd be building a very useful inventory of your
client machines. LTSP is meant to be a locked-down architecture.
Sometimes you'd need to add options (for different mice, monitors,
resolutions, etc.) to individual clients, and for that, you need unique
assigned hostnames.
A different fix for the slowdown is to run named, then make sure your
/etc/resolv.conf points to "nameserver 127.0.0.1". The slowdown you are
seeing with NFS is probably happening when the server tries to
reverse-resolve your client's hostname (asking the DNS server "What is
the hostname for 192.168.0.120?" for example). The ISP will claim there
is no such hostname, because it's not authoritative for it. So you'd
need to set up named to be authoritative for that zone
(0.168.192.in-addr.arpa.) in order to speed things up. Though I do not
know what hostname dhcpd is providing.
Hope to help,
- Jake
On Tue, Feb 25, 2003 at 10:54:45PM +0200, Warwick Bruce Chapman wrote:
> Howdy
>
> The reason we are using the PXELINUX boot method is because we don't want to
> have to explicitly specify each client, as in K12LTSP (Which we find too
> sluggish) and, lord forbid, Windows Terminal Services.
>
> If they have auto generated host names, where can I find the defaults to add
> them to a hosts file?
>
> Warwick Chapman
> Managing Member
> Thusa Business Support cc
> Cell: +27 83 7797094
> Fax: +27 31 2055838
>
> -- There are 10 types of people in this world. Those
> who understand binary, and those who don't.
>
>
> Quoting Jake Schroeder <akejay@freeshell.org>:
>
> > Okay, the workstations *never* "have no names".
> >
> > They get an IP address from the DHCP server. If you define their IP
> > addresses, then each one has a known IP address.
> >
> > When their hostname is looked up (through either "reverse-DNS lookups"
> > or lts.conf), they have a name.
> >
> > So, define all of your workstations in dhcpd.conf, lts.conf, and hosts.
> >
> > For example (from Guides at http://akejay.freeshell.org/openbox.html):
> >
> > #> Setting up a new Station:
> > #* Know: the MAC address of the station (like 00:10:23:46:12:35)
> > the hostname you want to give the station (like obs001)
> > the IP address you want to give the station (like 192.168.0.1)
> > optionally, what kernel options you want to supply
> > whether you want to create a guest account for the station
> > whether you want autologin to happen when the station boots
> > (and what username it should autologin with)
> > 1. # echo __IP address__ __hostname__ >>/etc/hosts
> > 2. #: Edit "/etc/dhcpd.conf":
> > inside the "group" section, add these lines:
> > ---cut-->
> > host __hostname__ {
> > hardware ethernet __MAC address__;
> > fixed-address __hostname__;
> > filename "/tftpboot/lts/vmlinuz-2.4.19-ltsp-1";
> > }
> > <--cut---
> > if you want to supply any kernel commandline options,
> > add these lines inside the new "host" section:
> > ---cut-->
> > option option-128 e4:45:74:68:00:00;
> > option option-129 "__kernel options__";
> > <--cut---
> > 3. # invoke-rc.d dhcp restart
> > 4. If you want to create a guest account for the Station:
> > add the account "__hostname__":
> > password: "__hostname__"
> > full name: "OpenBox Station"
> > 5. If you want an account to autologon when the station boots:
> > Edit "/etc/kde2/kdm/kdmrc": add this to the end:
> > ---cut-->
> > [X-__hostname__:0-Core]
> > AutoLoginEnable=true
> > AutoLoginUser=__account name__
> > [X-__hostname__:0-Greeter]
> > DefaultUser=__hostname__
> > <--cut---
> > 6. Run "echo [__hostname__] >>/opt/ltsp/i386/etc/lts.conf"
> > 7. On the Station, run Etherboot and see if it starts up. If not,
> > get help from someone who knows LTSP (or TFTP/NFS/XDMCP/XFS).
> >
> > Let us know how it goes!
> > - Jake
> >
> > P.S. Please critique me on the Guides, if you read them!
> >
> >
> >
> > On Tue, Feb 25, 2003 at 07:59:07PM +0200, Warwick Bruce Chapman wrote:
> > > Howdy
> > >
> > > How do I add workstations to the hosts file, when the stations have no
> > names.
> > > I am using the PXELINUX boot method, and therefore the "Setting hostname"
> > line
> > > during the workstation bootup doesn't have any name?
> > >
> > > Warwick Chapman
> > > Managing Member
> > > Thusa Business Support cc
> > > Cell: +27 83 7797094
> > > Fax: +27 31 2055838
> > >
> > > -- There are 10 types of people in this world. Those
> > > who understand binary, and those who don't.
> > >
> > >
> > > Quoting Matthew Johannes Winther <mwinther@efn.org>:
> > >
> > > > Do you have the workstations in the hosts file? because it sounds like a
> > > > name resolving issue I had a while ago. And when I added the
> > workstations
> > > > to the hosts file, It was fixed.
> > > >
> > > > Matthew Winther
> > > >
> > > > On Tue, 25 Feb 2003, Ken Cobler wrote:
> > > >
> > > > > Jake Schroeder wrote:
> > > > >
> > > > > >Please help, o great NFS gurus!
> > > > > >
> > > > > >The client is just sitting there and mounting, mounting, mounting.
> > It
> > > > > >seems that it tries about once every ten seconds. Why would this
> > fail?
> > > > > >
> > > > > >
> > > > > >Sadly this has gone beyond my experience in troubleshooting NFS. I
> > > > > >would investigate how to turn up debugging on the server to get more
> > > > > >descriptive errors about what is failing.
> > > > > >
> > > > > >I wish you lots of luck though! Let us all know how it goes.
> > > > > >- Jake
> > > > > >
> > > > > >
> > > > > >
> > > > > >On Tue, Feb 25, 2003 at 05:31:07PM +0200, Warwick Bruce Chapman
> > wrote:
> > > > > >
> > > > > >
> > > > > >>Howdy
> > > > > >>
> > > > > >>When I say sleep, I mean it does nothing more/freezes/dies.
> > > > > >>
> > > > > >>/var/log/messages says:
> > > > > >>
> > > > > >>Feb 25 19:16:26 krakatoa rpc.mountd: authenticated mount request from
> >
> > > > > >>192.168.0.150:688 for /opt/ltsp/i386 (/opt/ltsp/i386)
> > > > > >>Feb 25 19:17:06 krakatoa last message repeated 4 times
> > > > > >>Feb 25 19:18:16 krakatoa last message repeated 7 times
> > > > > >>Feb 25 19:19:17 krakatoa last message repeated 6 times
> > > > > >>Feb 25 19:20:27 krakatoa last message repeated 7 times
> > > > > >>
> > > > > >>
> > > > > I had a similar problem and never received an answer. I did determine
> >
> > > > > this much.
> > > > >
> > > > > My server (Redhat 8.0) has 2 ethernet cards with 10 LTSP workstations.
> >
> > > > > eth0 (10.0.0.X) was the LAN, eth1 (192.168.1.X) was the Internet
> > > > > connection through DSL. Default routing (gateway) went through eth1.
> > > > >
> > > > > If I turned off default routing, then the LTSP workstation NFS mounted
> >
> > > > > quickly as expected. However, without a default route, we could not
> > > > > access the internet.
> > > > >
> > > > > If I turned on default routing, we could access the Internet. However,
> >
> > > > > the NFS would start the described (see above) sleep like state during
> > > > > LTSP boot. The server would go from 95% idle to 20% idle. After about
> >
> > > > > 90 seconds, the LTSP workstation NFS mounted and the LTSP workstation
> > > > > booted the rest of the way as expected.
> > > > >
> > > > > It looked like to me, that the NFS replies were being sent down the
> > > > > wrong ethernet connection (eth1). After the server kernel timed out,
> > it
> > > > > would switch to eth0 and LTSP workstation would get its reply and
> > > > > complete NFS mounting.
> > > > >
> > > > > For now, we don't turn off the LTSP workstations unless we absolutely
> > > > > necessary. When we do, we just expect the 90 second delay before LTSP
> >
> > > > > booting.
> > > > >
> > > > > Any insights would be greatly appreciated.
> > > > >
> > > > > Ken Cobler
> > > > >
> > > > > >>
> > > > > >>
> > > > >
> > > > >
> > > > >
> > > > >
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> > > >
> > > >
> > > >
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> >
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> >
> >
> > -------------------------------------------------------
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> > https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
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> >
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