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@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)

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Message: 1 Date: Sun, 12 Jun 2011 12:03:17 -0400 From: Laine Stump <laine@laine.org> To: libvirt-users@redhat.com Subject: Re: [libvirt-users] libvirt-bin MOSTLY fails to create default virtual network Message-ID: <4DF4E345.7060104@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.

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Message: 2 Date: Mon, 13 Jun 2011 08:25:00 -0500 From: Jeff <jwk1230@gmail.com> To: libvirt-users@redhat.com Subject: [libvirt-users] Boot delay Message-ID: <4609858C-FB73-4E8A-B81B-3EDCBB83B755@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

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Message: 3 Date: Fri, 10 Jun 2011 15:12:36 -0500 From: Jeff <jwk1230@gmail.com> To: Osier Yang <jyang@redhat.com>, libvirt-users@redhat.com Subject: [libvirt-users] e: How to disconnect the ISO image using virsh Message-ID: <F301FBCE-65F1-411A-980E-EF8B6A46241B@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@cse.iitd.ernet.in> To: libvirt-users@redhat.com Subject: [libvirt-users] Difference between function Migrate and Migrate2 Message-ID: <BANLkTinv6XiRMz=rS88A-U-b2Hz3SVTesg@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

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Message: 5 Date: Mon, 13 Jun 2011 17:21:02 +0200 From: Michal Privoznik <mprivozn@redhat.com> To: Jeff <jwk1230@gmail.com> Cc: libvirt-users@redhat.com Subject: Re: [libvirt-users] Boot delay Message-ID: <4DF62ADE.60209@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

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Michal

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Message: 6 Date: Mon, 13 Jun 2011 11:42:44 -0400 From: Whit Blauvelt <whit.virt@transpect.com> To: libvirt-users@redhat.com Subject: [libvirt-users] hook scripts - not in Ubuntu packages? Message-ID: <20110613154244.GA28777@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

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