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1612 discussions

Xen, Qemu and Intel VT
by Nunzio Losacco 05 Feb '09

05 Feb '09

Hi everyone, I need to use full virtualization on my laptop, running CentOS 5.2 as host. I installed all I think is needed to run Xen. I am using kernel 2.6.18-128el5.xen as it is needed to recognize my wifi card. I was not sure my cpu supported Intel VT. A cat /proc/cpuinfo | grep flags yields this: flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx smx est tm2 cx16 xtpr lahf_lm I guess vmx means VT is supported even if, for my T9600 cpu, it is not officially stated on Intel website (it is up to T9400). VT is enabled in the BIos. When I try to add a virtual machine with virt-manager choosing Xen as hypervisor, the "enable kernel/hardware acceleration" checkbox is grayed out. How can I solve this? Moreover, if I run CentOS on a non-Xen kernel (i.e.: 2.6.18-128el5) I cannot use xen of course, but if I choose Qemu as hypervisor in virt-manager, the checkbox is available. How can it be? Thank you very much for your help, N.

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Re: [CentOS-virt] Mixed dom0/domU usage?
by Christopher G. Stach II 04 Feb '09

04 Feb '09

----- "Kai Schaetzl" <maillists(a)conactive.com> wrote: > Ben Montanelli wrote on Wed, 04 Feb 2009 11:50:04 -0500: > > > I guess many of us want the optimized "grail" dom0. > > There is none. It depends on your needs. This is pretty close to one. :) I also attached a trimmed down version of the kickstart config I use for dom0s. Some of it is irrelevant to many people, but I figured someone would find something useful in it, like fixing some of the brokenness. Some of the packages (like the ones for NTP, MD RAID, IPMI, LUKS, and iSCSI) can be removed if you don't need them. ntpd and snmpd can be disabled if you don't need/use them, or for security policy reasons, as well. dom0 services: srv1:[1:13pm]:120:~# chkconfig --list | grep :on acpid 0:off 1:off 2:off 3:on 4:on 5:on 6:off auditd 0:off 1:off 2:on 3:on 4:on 5:on 6:off cpuspeed 0:off 1:on 2:on 3:on 4:on 5:on 6:off crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off edac 0:off 1:off 2:on 3:on 4:on 5:on 6:off ip6tables 0:off 1:off 2:on 3:on 4:on 5:on 6:off iptables 0:off 1:off 2:on 3:on 4:on 5:on 6:off libvirtd 0:off 1:off 2:off 3:on 4:on 5:on 6:off lm_sensors 0:off 1:off 2:on 3:on 4:on 5:on 6:off lvm2-monitor 0:off 1:on 2:on 3:on 4:on 5:on 6:off mcstrans 0:off 1:off 2:on 3:on 4:on 5:on 6:off mdmonitor 0:off 1:off 2:on 3:on 4:on 5:on 6:off network 0:off 1:off 2:on 3:on 4:on 5:on 6:off ntpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off postfix 0:off 1:off 2:on 3:on 4:on 5:on 6:off restorecond 0:off 1:off 2:on 3:on 4:on 5:on 6:off smartd 0:off 1:off 2:on 3:on 4:on 5:on 6:off snmpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off sshd 0:off 1:off 2:on 3:on 4:on 5:on 6:off syslog 0:off 1:off 2:on 3:on 4:on 5:on 6:off sysstat 0:off 1:off 2:on 3:on 4:off 5:on 6:off xend 0:off 1:off 2:on 3:on 4:on 5:on 6:off xendomains 0:off 1:off 2:off 3:on 4:on 5:on 6:off dom0 kickstart: [...] services --disabled=avahi-daemon,gpm,haldaemon,kudzu,messagebus,netfs --enabled=ntpd,snmpd [...] %packages --nobase @core xen kernel-xen libvirt postfix ntp net-snmp sudo sysstat rsync tcpdump tcsh bzip2 man lsof smartmontools mailx screen vim-enhanced isns-utils iscsi-initiator-utils cryptsetup-luks vconfig acpid audit cpuspeed mdadm psacct xorg-x11-xauth edac-utils memtest86+ patch which yum-protectbase OpenIPMI OpenIPMI-tools %post touch /.autorelabel sed -i '/^\[/aprotect=1' /etc/yum.repos.d/CentOS-Base.repo cat << _EOF_ >> /etc/sysctl.conf net.core.rmem_max = 1048576 net.core.rmem_default = 1048576 net.core.wmem_max = 1048576 net.core.wmem_default = 1048576 vm.swappiness = 1 _EOF_ cat << _EOF_ > /etc/snmp/snmpd.conf [...] # This is so SNMP reports correct interface rates interface bond0 161 1000000000 interface bond0.10 135 1000000000 interface bond0.20 135 1000000000 interface bond0.30 135 1000000000 interface bond0.40 135 1000000000 interface bond0.101 135 1000000000 [...] _EOF_ sed -i 's/^[ \t]*LoginGraceTime.*/#&/g' /etc/ssh/sshd_config sed -i 's/^[ \t]*PermitRootLogin.*/#&/g' /etc/ssh/sshd_config sed -i 's/^[ \t]*MaxAuthTries.*/#&/g' /etc/ssh/sshd_config sed -i 's/^[ \t]*PasswordAuthentication.*/#&/g' /etc/ssh/sshd_config sed -i 's/^[ \t]*MaxStartups.*/#&/g' /etc/ssh/sshd_config cat << _EOF_ >> /etc/ssh/sshd_config LoginGraceTime 1m PermitRootLogin forced-commands-only MaxAuthTries 2 PasswordAuthentication no MaxStartups 2 _EOF_ sed -i 's#kernel /xen.*#& dom0_mem=2G#' /boot/grub/grub.conf sed -i 's#module /vmlinuz.*#& elevator=deadline#' /boot/grub/grub.conf cat << _EOF_ >> /etc/modprobe.conf alias bond0 bonding options bond0 mode=balance-rr miimon=100 updelay=1000 options netloop nloopbacks=64 options forcedeth max_interrupt_work=10 _EOF_ touch /etc/sysconfig/iptables sed -i -r 's/^IPTABLES_MODULES=.*/#&/' /etc/sysconfig/iptables-config sed -i -r '/^#IPTABLES_MODULES=.*/a \IPTABLES_MODULES=""' /etc/sysconfig/iptables-config cat << _EOF_ > /etc/sysconfig/network-scripts/ifcfg-bond0 DEVICE=bond0 BOOTPROTO=none ONBOOT=yes USERCTL=no _EOF_ cat << _EOF_ > /etc/sysconfig/network-scripts/ifcfg-bond0.10 DEVICE=bond0.10 BOOTPROTO=none ONBOOT=yes USERCTL=no VLAN=yes BRIDGE=br10 _EOF_ cat << _EOF_ > /etc/sysconfig/network-scripts/ifcfg-br10 DEVICE=br10 TYPE=Bridge BOOTPROTO=static BROADCAST=<xxx> IPADDR=<xxx> NETMASK=<xxx> NETWORK=<xxx> IPV6INIT=yes IPV6_AUTOCONF=yes ONBOOT=yes DELAY=0 STP=on _EOF_ sed -i -r '/^(HWADDR=|#)/!d' /etc/sysconfig/network-scripts/ifcfg-eth0 cat << _EOF_ >> /etc/sysconfig/network-scripts/ifcfg-eth0 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no _EOF_ sed -i -r '/^(HWADDR=|#)/!d' /etc/sysconfig/network-scripts/ifcfg-eth1 cat << _EOF_ >> /etc/sysconfig/network-scripts/ifcfg-eth1 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no _EOF_ sed -i -r '/^(HWADDR=|#)/!d' /etc/sysconfig/network-scripts/ifcfg-eth2 cat << _EOF_ >> /etc/sysconfig/network-scripts/ifcfg-eth2 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no _EOF_ sed -i -r '/^(HWADDR=|#)/!d' /etc/sysconfig/network-scripts/ifcfg-eth3 cat << _EOF_ >> /etc/sysconfig/network-scripts/ifcfg-eth3 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no _EOF_ sed -i -r 's/(SYNC_HWCLOCK=).*/\1yes/' /etc/sysconfig/ntpd cat << _EOF_ > /root/xendomains.patch --- /etc/init.d/xendomains.dist 2008-11-04 09:57:48.000000000 -0600 +++ /etc/init.d/xendomains 2008-11-04 09:58:30.000000000 -0600 @@ -175,9 +175,9 @@ parseln() { - name=\`echo "\$1" | cut -c0-17\` + name=\`echo "\$1" | cut -d' ' -f1\` name=\${name%% *} - rest=\`echo "\$1" | cut -c18- \` + rest=\`echo "\$1" | cut -d' ' -f2-\` read id mem cpu vcpu state tm < <(echo "\$rest") } _EOF_ patch -p0 < /root/xendomains.patch mv /etc/xen/xend-config.sxp /etc/xen/xend-config.sxp.dist cat << _EOF_ > /etc/xen/xend-config.sxp # -*- sh -*- (xend-unix-server yes) (xend-unix-path /var/lib/xend/xend-socket) (xend-relocation-server yes) (xend-relocation-port 8002) (xend-relocation-address '<xxx>') (xend-relocation-hosts-allow '^localhost\$ ^localhost\\\\.localdomain\$ ^<xxx>\$') (network-script /bin/true) (vif-script vif-bridge) (dom0-min-mem 768) (dom0-cpus 1) (vncpasswd '') _EOF_ sed -i -r 's/^XENDOMAINS_SAVE=.*/#&/' /etc/sysconfig/xendomains sed -i '/^#XENDOMAINS_SAVE=/a \XENDOMAINS_SAVE=' /etc/sysconfig/xendomains rm -f /etc/libvirt/qemu/networks/autostart/default.xml mkdir /root/.ssh cat << _EOF_ > /root/.ssh/authorized_keys command="/usr/bin/virt-manager" ssh-rsa <xxx> <xxx> _EOF_ %end -- Christopher G. Stach II

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Mixed dom0/domU usage?
by Dennis J. 04 Feb '09

04 Feb '09

Hi, I'm wondering about the impact of using both dom0 and domU's on a server at the same time. I'm worried about the performance impact of running a Mysql server in a domU and now I'm thinking about moving the Mysql part of a LAMP setup into dom0 and running a few Apache guests as domUs. Since the Apaches will serve mostly from an NFS share they won't have much impact on the disk i/o so the database should be able to utilize the local storage without much interference from the guests. The plan is to limit dom0 to let's say 4gb of ram and then use the rest of it for the VMs. Has anyone experinece with this kind of "mixed" setup (physical/virtual). Are there any known problems with this approach? Regards, Dennis

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Using the parallel port from domU
by Manuel Wolfshant 04 Feb '09

04 Feb '09

Hello I use xen and I am trying to use the parallel port of Centos 5.2 host from a Windows XP (HVM) guest. I have tried to transfer control of the port by blacklisting lp, parport and parport_pc + adding: ioports = [ "0378-037a" ] to the xen configuration file. However, in the presence of this line, xm create replies with: Error: function takes exactly 4 arguments (3 given) In xend.log I see: [2009-02-02 15:36:34 xend.XendDomainInfo 6246] DEBUG (XendDomainInfo:1603) XendDomainInfo.destroy: domid=13 [2009-02-02 15:36:34 xend 6246] ERROR (xmlrpclib2:184) function takes exactly 4 arguments (3 given) Traceback (most recent call last): File "/usr/lib64/python2.4/site-packages/xen/util/xmlrpclib2.py", line 162, in _marshaled_dispatch response = self._dispatch(method, params) File "/usr/lib64/python2.4/SimpleXMLRPCServer.py", line 406, in _dispatch return func(*params) File "/usr/lib64/python2.4/site-packages/xen/xend/server/XMLRPCServer.py", line 64, in domain_create info = XendDomain.instance().domain_create(config) File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomain.py", line 238, in domain_create dominfo = XendDomainInfo.create(config) File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 205, in create vm.initDomain() File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1507, in initDomain self.createDevices() File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1716, in createDevices self.createDevice(n, c) File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1189, in createDevice return self.getDeviceController(deviceClass).createDevice(devconfig) File "/usr/lib64/python2.4/site-packages/xen/xend/server/DevController.py", line 80, in createDevice (devid, back, front) = self.getDeviceDetails(config) File "/usr/lib64/python2.4/site-packages/xen/xend/server/iopif.py", line 78, in getDeviceDetails allow_access = True) TypeError: function takes exactly 4 arguments (3 given) Except of a bug from 2007 and which should be fixed for a long time (and which is only PARTIALLY included in xen as available in 5.2), I have not found anything. I did apply the unapplied part of http://bugs.centos.org/file_download.php?file_id=474&type=bug but there is no change. Any ideas ? TIA manuel

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RESOLVED : CentOS 5.2 (x86_64) : 64 bit HVM VM fails.
by jd 30 Jan '09

30 Jan '09

ok.. found the problem. The config file had pae=0. Changed it to pae=1 and now it is working. /Jd --- On Thu, 1/29/09, jd <jdsw2002(a)yahoo.com> wrote: > From: jd <jdsw2002(a)yahoo.com> > Subject: CentOS 5.2 (x86_64) : 64 bit HVM VM fails. > To: centos-virt(a)centos.org > Date: Thursday, January 29, 2009, 3:48 PM > hi > I am trying to do an installation of 64 bit HVM from a > CDROM, the Dom0 is 64 bit. I am getting "pae not > supported" !! > > (as a side note, failure on RHEL 5.2 is different > 'long not supported on your cpu, use a 32-bit > version' .. cpu is 64 bit AMD and so is Dom0) > > Do I need to tweak anything ? > > Thanks > /Jd

1 0

CentOS 5.2 (x86_64) : 64 bit HVM VM fails.
by jd 29 Jan '09

29 Jan '09

hi I am trying to do an installation of 64 bit HVM from a CDROM, the Dom0 is 64 bit. I am getting "pae not supported" !! (as a side note, failure on RHEL 5.2 is different 'long not supported on your cpu, use a 32-bit version' .. cpu is 64 bit AMD and so is Dom0) Do I need to tweak anything ? Thanks /Jd

1 0

xen clustermanagement?
by Heiko 27 Jan '09

27 Jan '09

Hello, im looking thorugh this list: http://www.gridvm.org/xen-remote-management-interfaces.html and wondering which would be the bst solution for our XEN machines. We have 20 Machines that serve each 3-8 Xen VMs. Right now we are doing everything by hand on the bash. I am setting up a new hardware machine and I would like to start with a managemet GUI for XEN. beside that I have another questions My client in the office is a debian based machine and I installed convirt, do I need a server on the centos server to communicate with convirt? greetings .r

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Re: [CentOS-virt] dummy ethernet interfaces
by Christopher G. Stach II 23 Jan '09

23 Jan '09

----- "Caitlyn O'Hanna" <ravenoak(a)virtualxistenz.com> wrote: > Actually, I don't know how to tell it its speed, or for that matter I > seem to not be able to find out what it thinks its speed is. What is bothering you about it? Is it showing up in an NMS via SNMP and miscalculating thresholds, or is it just cosmetic and a non-issue? > For completeness, and I'd also like to bump it up to 1000Mb/s or > higher > if I can, how would I go about finding out it's speed and changing > it? You don't. It's not a real interface. -- Christopher G. Stach II

1 0

dummy ethernet interfaces
by Caitlyn O'Hanna 23 Jan '09

23 Jan '09

I have a 32bit(PAE) CentOS5 machine running (stock CentOS) Xen. I've been using the kernel dummy ethernet driver to create interfaces on the host machine so that I can create internal networks for the guests and host to communicate with each other. The only issue I have with this is that the interface is not >=100MB, but is 10MB. Is there a way I can increase the speed of these interfaces (I've tried looking at the kernel docs and google'ing) or another dummy style interface driver I can use to create these? Thanks! --Caitlyn

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Warning on VirtualBox 2.1.0 on CentOS 5.2: Kernel Panic
by Todd and Margo Chester 23 Jan '09

23 Jan '09

Hi All, I just removed Virtual Box 2.1.0 from my system. When you boot up an XP guest, you will get a kernel panic. See http://www.virtualbox.org/ticket/2827 for details. I hope I saved someone else from the hassle I just had to go through. -T Now for FSCK on my hard drive!

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