[libvirt-users] libvirt-users Digest, Vol 18, Issue 17

Mon Jun 20 16:48:50 UTC 2011

Yes, I also think that iptables module should be loaded before libvirt-bin
and I have seen a post which regarded loading conntrack modules and these
modules also seem to be necessary...
I know a little about Upstart in Ubuntu. However, I still don't know how to
properly solve this problem.
ip_tables module depend on other modules being loaded and since I don't know
the full list of modules which should be loaded (for IP tables to work) I
don't know how to handle that. Besides, even if I had this list, it could
change for some time, so it is not a good idea to rely on that.

Version which I have installed is the newest release from Ubuntu
repositories.

Thank you for help.
I will be grateful for any further suggestions.

2011/6/13 <libvirt-users-request at redhat.com>

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> Today's Topics:
>
>   1. Re: libvirt-bin MOSTLY fails to create default virtual
>      network (Laine Stump)
>   2. Boot delay (Jeff)
>   3. e:  How to disconnect the ISO image using virsh (Jeff)
>   4. Difference between function Migrate and Migrate2 (Abhishek Gupta)
>   5. Re: Boot delay (Michal Privoznik)
>   6. hook scripts - not in Ubuntu packages? (Whit Blauvelt)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 12 Jun 2011 12:03:17 -0400
> From: Laine Stump <laine at laine.org>
> To: libvirt-users at redhat.com
> Subject: Re: [libvirt-users] libvirt-bin MOSTLY fails to create
>        default virtual network
> Message-ID: <4DF4E345.7060104 at laine.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 06/06/2011 03:24 PM, m m wrote:
> > I have observed 3 scenarios after I reboot the host with 2 guests
> > (which are supposed to autostart after boot/reboot of the host):
> > 1. Default network is created but I can not ping guests. Gests don't
> > have assigned IP address or they both have IP address 192.168.122.100.
> > 2. Default network is not created.
> > 3. Default netork is properly created and everything works fine.
> > In each case guests are started and they work properly. Cases 1. and
> > 2. happen a lot more often then case 3.
> >
> > My solutions:
> > - When I restart libvirt-bin then everything is fine.
> > - When I set 'sleep 40' in 'pre-start' section of
> > /etc/init/libvirt-bin.conf and modify 'start on' section in the
> > following way:
> >
> > start on (runlevel [2345] and net-device-up IFACE=br0)
> >
> > then everything works fine.
> >
> >
> > However, none of the above solutions indeed solves the problem.
> > Please, let me know if there is solution to this problem or what are
> > your suggestions regarding this issue.
> >
> > ****
> > HOST$ uname -a
> > Linux ras 2.6.32-32-server #62-Ubuntu SMP Wed Apr 20 22:07:43 UTC 2011
> > x86_64 GNU/Linux
> >
> > GUEST1 and GUEST2
> > $ uname -a
> > Linux server1-desktop 2.6.32-32-generic #62-Ubuntu SMP Wed Apr 20
> > 21:54:21 UTC 2011 i686 GNU/Linux
> >
> > HOST$ libvirtd --version
> > libvirtd (libvirt) 0.7.5
> >
> > My idea was that some kernel modules sometimes are loaded before
> > libvirt-bin starts, and sometimes libvirt-bin starts earlier, or in
> > the middle of loading of these modules, that is why 3 scenarios can be
> > observed.
> > That is why I have added:
> >  cp /proc/modules /home/wsadmin2/modules1
> >  cp /proc/modules /home/wsadmin2/modules2
> > to 'pre-start' and 'post-start' parts respectively of
> > /etc/init/libvirt-bin.conf.
> >
> > Of course, beween execution of
> > - pre-start part
> > - exec /usr/sbin/libvirtd -d
> > - post-start part
> > other kernel modules can be loaded, so we can not be sure which
> > additional modules in file 'modules2' were indeed loaded before
> > libvirtd was actually started.
> >
> > Here are my observations:
> > Scenatio 1.
> > 33 (fixed) modules were logged - call them BASE MODULES.
> >
> > Scenatio 2.
> > Beside BASE MODULES + the following modules were loaded:
> >
> > > iptable_filter 1841 0 - Live 0xffffffffa007c000
> > > ip_tables 18201 1 iptable_filter, Live 0xffffffffa0172000
> > > x_tables 22361 1 ip_tables, Live 0xffffffffa0164000
>
> In your "scenario 1" the modules necessary for iptables to function
> haven't been loaded. Each virtual network requires a set of iptables
> rules to function properly, and if there is no iptables, the rules can't
> be added and network creation fails. Your libvirtd.log confirms that
> problem:
>
>   10:06:06.980: error : networkAddIptablesRules:750 : failed to add
> iptables rule to allow DHCP requests from 'virbr0': Invalid argument
>
>
> 0.7.5 is quite old (> 1 year), is there perhaps a newer pre-built
> version of libvirt available for your release of Ubuntu?
>
> It seems that Ubuntu's method of starting up libvirtd (at least on your
> machine) is missing a dependency to force iptables to be loaded before
> libvirtd starts. I'm unfamiliar with Ubuntu/debian startup stuff
> (upstart, I guess), but that's where you need to look for the solution.
>
> I found the following in the ubuntu bug database, which seems similar,
> but not identical (basically the system networking isn't completely
> ready by the time the autostart domains are brought up):
>
> https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/495394
>
> >
> > Scenatio 3.
> > Beside BASE MODULES + the following modules were loaded:
> >
> > $ diff modules1 modules2
> > 1c1,6
> > < iptable_filter 1841 0 - Live 0xffffffffa008b000
> > ---
> > > xt_state 1490 14 - Live 0xffffffffa01ab000
> > > xt_tcpudp 2667 12 - Live 0xffffffffa01a5000
> > > nf_conntrack_ipv4 12742 14 - Live 0xffffffffa019b000
> > > nf_conntrack 73326 2 xt_state,nf_conntrack_ipv4, Live
> 0xffffffffa017d000
>
> conntrack is used by iptables. I haven't tried it, but wouldn't be
> surprised if adding rules that required conntrack failed if it hadn't
> been loaded, or something like that.
>
> > > nf_defrag_ipv4 1481 1 nf_conntrack_ipv4, Live 0xffffffffa0177000
> > > iptable_filter 1841 1 - Live 0xffffffffa008b000
> > 3c8
> > < x_tables 22361 1 ip_tables, Live 0xffffffffa0162000
> > ---
> > > x_tables 22361 3 xt_state,xt_tcpudp,ip_tables, Live 0xffffffffa0162000
> >
> > Other observations:
> > Scenatio 1.
> > No errors in libvirtd.log
> > Scenario 2.
> >
> > 10:06:06.980: error : networkAddIptablesRules:750 : failed to add
> > iptables rule to allow DHCP requests from 'virbr0': Invalid argument
> > (...)
> > 10:06:08.630: error : qemudNetworkIfaceConnect:1445 : Failed to add
> > tap interface to bridge 'virbr0': No such device
> > 10:06:08.630: error : qemuAutostartDomain:584 : Failed to autostart VM
> > 'cluster_server1': Failed to add tap interface to bridge 'virbr0': No
> > such device
> >
> > 10:06:08.921: info : qemudDispatchSignalEvent:390 : Received
> > unexpected signal 17
> > 10:06:08.927: debug : virExecWithHook:617 : LC_ALL=C /usr/bin/kvm -help
> > 10:06:08.938: info : qemudDispatchSignalEvent:390 : Received
> > unexpected signal 17
> > 10:06:09.000: error : qemudNetworkIfaceConnect:1445 : Failed to add
> > tap interface to bridge 'virbr0': No such device
> > 10:06:09.000: error : qemuAutostartDomain:584 : Failed to autostart VM
> > 'cluster_server2': Failed to add tap interface to bridge 'virbr0': No
> > such device
> > (...)
> > Scenatio 3.
> > No errors in libvirtd.log
> >
> >
> > I didn't see any valuable logs in /var/log/boot.log,
> > /var/log/messages, /var/log/syslog. Please let me know if you want to
> > see them anyway or have any suggestions right away.
> >
> >
> > _______________________________________________
> > libvirt-users mailing list
> > libvirt-users at redhat.com
> > https://www.redhat.com/mailman/listinfo/libvirt-users
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 13 Jun 2011 08:25:00 -0500
> From: Jeff <jwk1230 at gmail.com>
> To: libvirt-users at redhat.com
> Subject: [libvirt-users] Boot delay
> Message-ID: <4609858C-FB73-4E8A-B81B-3EDCBB83B755 at gmail.com>
> Content-Type: text/plain; charset=us-ascii
>
> Is there a method of tweaking the boot sequence of a KVM instance so that
> you can delay the process for X number of seconds? I don't have enough time
> between starting the KVM and connecting via VNC.
>
> Thanks
>
> Jeff
>
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 10 Jun 2011 15:12:36 -0500
> From: Jeff <jwk1230 at gmail.com>
> To: Osier Yang <jyang at redhat.com>, libvirt-users at redhat.com
> Subject: [libvirt-users] e:  How to disconnect the ISO image using
>        virsh
> Message-ID: <F301FBCE-65F1-411A-980E-EF8B6A46241B at gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I am trying to detach an ISO from a KVM machine and I've tried both
> attach-disk using " " in the file path as well as the update-device option
> but am getting this error
>
> error: Failed to update device from /var/run/libvirt/qemu/kvmtest1.xml
> error: XML description for unknown device type is not well formed or
> invalid.
>
> I tried doing a virsh edit on the xml file to remove the source file path
> to the ISO, as I assume is the correct method, and then running the virsh
> update-device but it's not working.
>
> Can anyone advise the correct steps to detach a device from a running
> and/or offline domain?
>
> Additionally - anyone have any guidance on how to attach a CD device to a
> domain that is currently shutdown, for example, if I wanted to boot the
> domain to a rescue CD image?
>
> Thanks
>
> Jeff
>
>
> ? 2011?03?31? 15:17, Masanari Iida ??:
> Somebody sent me a tips.
> Following command do what I wanted to do.
> Thanks.
>
> attach-disk guest01 " " hdc --driver file --type cdrom
> --mode readonly
> Also using "update-device" with an xml which doesn't specify
> the source file path will work.
>
> On Thu, Mar 31, 2011 at 3:29 PM, Masanari Iida<standby24x7 gmail com>
>  wrote:
> Hello,
>
> I can attach disc ISO image to cd-rom from virsh.
> And I can replace the ISO image from disc1 to disc2 using the 2nd example.
>
> (example)
> attach-disk guest01 /root/disc1.iso hdc --driver file --type cdrom
> --mode readonly
> attach-disk guest01 /root/disc2.iso hdc --driver file --type cdrom
> --mode readonly
>
> My question is, how can I disconnect the image from the cdrom drive using
> virsh.
> Because, if I try to detach-disk hdc, I got following errors.
>
> virsh # detach-disk guest01 hdc
> error: Failed to detach disk
> error: this function is not supported by the connection driver:
> This type of device cannot be hot unplugged
>
> What I can do is possible from virt-manager's "Disconnect" button,
> (next to source path: line)  from Hardware's TAB, Disk hdc screen.
> I want to do this from virsh.
>
> OS: RHEL5.6
> libvirt-0.8.2-15.el5_6.1 is used.
>
> Regards,
> Masanari Iida
>
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> ------------------------------
>
> Message: 4
> Date: Sat, 11 Jun 2011 06:39:46 +0530
> From: Abhishek Gupta <cs1090174 at cse.iitd.ernet.in>
> To: libvirt-users at redhat.com
> Subject: [libvirt-users] Difference between function Migrate and
>        Migrate2
> Message-ID: <BANLkTinv6XiRMz=rS88A-U-b2Hz3SVTesg at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> I was reading the API reference for the libvirt, when I came across
> the function? virDomainMigrate and virDomainMigrate2. I am unable to
> find the difference between the two. Can someone please tell the
> difference in the application of the two?
>
> --
> Abhishek
>
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 13 Jun 2011 17:21:02 +0200
> From: Michal Privoznik <mprivozn at redhat.com>
> To: Jeff <jwk1230 at gmail.com>
> Cc: libvirt-users at redhat.com
> Subject: Re: [libvirt-users] Boot delay
> Message-ID: <4DF62ADE.60209 at redhat.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On 13.06.2011 15:25, Jeff wrote:
> > Is there a method of tweaking the boot sequence of a KVM instance so that
> you can delay the process for X number of seconds? I don't have enough time
> between starting the KVM and connecting via VNC.
> >
> You might consider using virt-viewer. It simply waits for domain to
> boot, if it is down.
>
> Your other option is to create hook script:
> http://libvirt.org/hooks.html
> and put conditional sleep there, because libvirt just before running a
> domain tries to execute qemu with some arguments (e.g. -help) to qeury
> its capabilities. And you don't want your hook script to delay that.
>
> So you need something like this:
>
> if [ $2 == "start" ]; then
>        sleep 5
> fi
>
> > Thanks
> >
> > Jeff
> >
> > _______________________________________________
> > libvirt-users mailing list
> > libvirt-users at redhat.com
> > https://www.redhat.com/mailman/listinfo/libvirt-users
>
> Michal
>
>
>
> ------------------------------
>
> Message: 6
> Date: Mon, 13 Jun 2011 11:42:44 -0400
> From: Whit Blauvelt <whit.virt at transpect.com>
> To: libvirt-users at redhat.com
> Subject: [libvirt-users] hook scripts - not in Ubuntu packages?
> Message-ID: <20110613154244.GA28777 at black.transpect.com>
> Content-Type: text/plain; charset=us-ascii
>
> On Mon, Jun 13, 2011 at 05:21:02PM +0200, Michal Privoznik wrote:
>
> > Your other option is to create hook script:
> > http://libvirt.org/hooks.html
>
> That looks useful.
>
> On several Ubuntu systems, with Ubuntu libvirt 0.8.8 and 0.8.3 packages
> installed, there's no libvirt/hooks/ directory at all. Is this a directory
> that can simply be created and used under libvirt, or does using this
> feature on Ubuntu require custom installation?
>
> Thanks,
> Whit
>
>
>
> ------------------------------
>
> _______________________________________________
> libvirt-users mailing list
> libvirt-users at redhat.com
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>
> End of libvirt-users Digest, Vol 18, Issue 17
> *********************************************
>
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