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

Send libvirt-users mailing list submissions to libvirt-users(a)redhat.com To subscribe or unsubscribe via the World Wide Web, visit https://www.redhat.com/mailman/listinfo/libvirt-users or, via email, send a message with subject or body 'help' to libvirt-users-request(a)redhat.com You can reach the person managing the list at libvirt-users-owner(a)redhat.com When replying, please edit your Subject line so it is more specific than "Re: Contents of libvirt-users digest..." 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(a)laine.org&gt; To: libvirt-users(a)redhat.com Subject: Re: [libvirt-users] libvirt-bin MOSTLY fails to create default virtual network Message-ID: <4DF4E345.7060104(a)laine.org&gt; 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(a)redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users ------------------------------ Message: 2 Date: Mon, 13 Jun 2011 08:25:00 -0500 From: Jeff <jwk1230(a)gmail.com&gt; To: libvirt-users(a)redhat.com Subject: [libvirt-users] Boot delay Message-ID: <4609858C-FB73-4E8A-B81B-3EDCBB83B755(a)gmail.com&gt; 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(a)gmail.com&gt; To: Osier Yang <jyang(a)redhat.com&gt;, libvirt-users(a)redhat.com Subject: [libvirt-users] e: How to disconnect the ISO image using virsh Message-ID: <F301FBCE-65F1-411A-980E-EF8B6A46241B(a)gmail.com&gt; 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 _______________________________________________ libvirt-users mailing list libvirt-users redhat com https://www.redhat.com/mailman/listinfo/libvirt-users -------------- next part -------------- An HTML attachment was scrubbed... URL: < https://www.redhat.com/archives/libvirt-users/attachments/20110610/f4acfe... > ------------------------------ Message: 4 Date: Sat, 11 Jun 2011 06:39:46 +0530 From: Abhishek Gupta <cs1090174(a)cse.iitd.ernet.in&gt; To: libvirt-users(a)redhat.com Subject: [libvirt-users] Difference between function Migrate and Migrate2 Message-ID: <BANLkTinv6XiRMz=rS88A-U-b2Hz3SVTesg(a)mail.gmail.com&gt; 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(a)redhat.com&gt; To: Jeff <jwk1230(a)gmail.com&gt; Cc: libvirt-users(a)redhat.com Subject: Re: [libvirt-users] Boot delay Message-ID: <4DF62ADE.60209(a)redhat.com&gt; 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(a)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(a)transpect.com&gt; To: libvirt-users(a)redhat.com Subject: [libvirt-users] hook scripts - not in Ubuntu packages? Message-ID: <20110613154244.GA28777(a)black.transpect.com&gt; 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(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users End of libvirt-users Digest, Vol 18, Issue 17 *********************************************