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1608 discussions

Xen live migration
by Lars Hecking 12 May '11

12 May '11

I can't get xen live migration to work - CentOS 5.6. I have set up xend-config.sxp as per RHEL5 virtualization guide, but when I try it, I get [root@xenhost1 ]# xm migrate testwww xenhost2 -l Error: (104, 'Connection reset by peer') Usage: xm migrate <Domain> <Host> Migrate a domain to another machine. Options: -h, --help Print this help. -l, --live Use live migration. -p=portnum, --port=portnum Use specified port for migration. -r=MBIT, --resource=MBIT Set level of resource usage for migration. Any ideas what to check? brctl, xend-config.sxp, lsof, are all in agreement with http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualiz….

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Launch scripts after kvm guest starts and before kvm guest stops
by carlopmart 12 May '11

12 May '11

Hi all, Is it possible to launch scripts after kvm guest starts and before kvm stops with libvirt or another kvm tool?? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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KVM switch in promiscuous mode
by carlopmart 12 May '11

12 May '11

Hi all, I am trying to enable promiscuous mode on a kvm switch due to sniff all traffic using snort installed on a kvm guest. I have found a partial solution configuring this bridge with "brctl setaging br0 0", but all vms sees all traffic. I think the soultion is using ebtables but I didn't found any doc about how can I do under kvm (and upstream recommends disable this function). Any ideas?? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Re: [CentOS-virt] A question about memory ballooning
by carlopmart 07 May '11

07 May '11

> And the opposite question, can memory balloon be deallocated?? And is > it possible to do this automatically or is an error to do this?? I think your understanding of ballooning may be backwards. The purpose of the balloon driver is to give the host system a way of recovering memory from the guest when the demands on the host's physical memory exceed the amount available. The balloon inflates within the guests forcing them to swap or take other memory management measures. When the pressure on the host eases the balloon deflates automatically. Sorry Drew, but I don't understand the use of balloon driver like you explains. According to RedHat's docs: "The balloon driver allows guests to express to the hypervisor how much memory they require. The balloon driver allows the host to efficiently allocate memory to the guest and allow free memory to be allocated to other guests and processes. Guests using the balloon driver can mark sections of the guest's RAM as not in use (balloon inflation). The hypervisor can free the memory and use the memory for other host processes or other guests on that host. When the guest requires the freed memory again, the hypervisor can reallocate RAM to the guest (balloon deflation). " http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualiz… (The balloon driver) I don't see in this doc any reference to "balloon driver is to give the host system a way of recovering memory from the guest when the demands on the host's physical memory exceed the amount available" -- CL Martinez carlopmart {at} gmail {d0t} com

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Package updates and "required" reboots
by Ben M. 06 May '11

06 May '11

I still operate under the assumption that glibc and kernel updates "require" a reboot to be prudent on a Linux OS. With CentOS Xen 5.6 (standard installation, SELinux enabled) is there an FAQ or general user consensus as to when to do a reboot after what updates?

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Where is my qemu command?
by Jussi Hirvi 27 Apr '11

27 Apr '11

KVM virtualization is full of wonders. :-/ I would need to attach an USB disk to a vm, but how? The command "qemu" would provide a way: [root@a134-224 yum.repos.d]# man qemu-kvm > QEMU(1) > NAME > qemu-doc - QEMU Emulator User Documentation > > SYNOPSIS > usage: qemu [options] [disk_image] (...) > -usbdevice devname > Add the USB device devname. But when I try it: [root@a134-224 yum.repos.d]# qemu start -usbdevice host:059f:1018 mail -bash: qemu: command not found That command syntax is probably ot right yet, but the main question is, where is qemu? I was tempted to yum-install qemu from rpmforge, but I would rather not. Besides the rpmforge version has a conflict with another manual page. - Jussi -- Jussi Hirvi * Green Spot Suvilahdenkatu 1 B 78 * 00500 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

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xen/ppp
by Fernando Hallberg 27 Apr '11

27 Apr '11

Hi, I'm installed xen4.0.1 for testing purposes in my home gateway and when booting with xen kernel ppp connection fails. Any idea ? -- Fernando Hallberg fernando(a)flexdigital.com.br http://www.flexdigital.com.br Fone/Fax: +55 45 3222-3222 Cascavel - PR - Brasil

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A question about memory ballooning
by carlopmart 26 Apr '11

26 Apr '11

Hi all, How can I manage automatically memory ballooning under a kvm host (C5.6 and future C6)?? For example if I define a kvm guest to boot up with 512MB of RAM and I have configured 1GB as a maximum memory for this guest, how can I allocate this memory when guest will need it?? And the opposite question, can memory balloon be deallocated?? And is it possible to do this automatically or is an error to do this?? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Re: [CentOS-virt] Extract ip address from a kvm guest
by John L. Magee 24 Apr '11

24 Apr '11

See http://rwmj.wordpress.com/2010/10/26/tip-find-the-ip-address-of-a-virtua l-machine/ There is also a later post on this blog --- jlm

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P2v - Clonezilla method
by Jussi Hirvi 24 Apr '11

24 Apr '11

I would need to migrate systems from physical machines to kvm. I am interested in the "Clonezilla method": http://pve.proxmox.com/wiki/Migration_of_servers_to_Proxmox_VE#Physical_ser… One question, though. How can one boot a kvm guest to Clonezilla? The only way I found was using qemu-kvm like this: > qemu-kvm –hda linux.img –m 512 -boot,order=dc Qemu (which provides this command) is not installed by default on my CentOS5.6 kvm host. Is it safe to install it, and use qemu-kvm commands? - Jussi

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