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xen_balloon: reserve_additional_memory: add_memory() Errors
by Chris Elliott 10 Jan '14

10 Jan '14

Hi All Back in August there was a report of these errors popping up in dmesg, and as far as I can tell it's still unresolved even in the latest kernel. System RAM resource [mem 0xc8000000-0xcfffffff] cannot be added xen_balloon: reserve_additional_memory: add_memory() failed: -17 On this example its running 3.10.20-11.el6.centos.alt.x86_64 To replicate this just disable Dom0 memory ballooning in /etc/xen/xend-config.sxp and these errors will over time completely fill up dmesg. This is because the amount of memory within these two sys files is different: /sys/devices/system/xen_memory/xen_memory0/info/current_kb /sys/devices/system/xen_memory/xen_memory0/target_kb We can manually edit to work around the problem and stop the error but its not ideal, I would help with making a patch but don't really know where to start! Thanks Chris

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6.5 live migration speed
by Ulrich Leodolter 10 Jan '14

10 Jan '14

hello, while upgrading a kvm virtualization cluster from c6.4 to c6.5 and i am no longer able to control the migration speed. in c6.4 the default speed was the maximum bandwidth (1g in my case) and the actual migration speed was about 100MB/s. now in c6.5 the actual migration speed dropped down to about 25MB/s - 50MB/s, it varies and sometimes during migration of huge machines (36GB) i was at 100MB/s, but only for seconds. i tried also to set speed using this command: virsh migrate-setspeed <domain> --bandwidth 1000 but it seems it has no affect, i remember in c6.3 the default migration speed was 33% of total bandwidth and at that time the above command worked and 100% were used during migration. can anyone confirm this ?? thanks ulrich

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Announcing a new HA KVM tutorial!
by Digimer 06 Jan '14

06 Jan '14

Almost exactly two years ago, I released the first tutorial for building an HA platform for KVM VMs. In that time, I have learned a lot, created some tools to simplify management and refined the design to handle corner-cases seen in the field. Today, the culmination of that learning is summed up in the "2nd Edition" of that tutorial, now called "AN!Cluster Tutorial 2". https://alteeve.ca/w/AN!Cluster_Tutorial_2 These HA KVM platforms have been in production for over two years now in facilities all over the world; Universities, municipal governments, corporate DCs, manufacturing facilities, etc. I've gotten wonderful feedback from users and all that real-world experience has been integrated into this new tutorial. As always, everything is 100% open source and free-as-in-beer! The major changes are: * SELinux and iptables are enabled and used. * Numerous slight changes made to the OS and cluster stack configuration to provide better corner-case fault handling. * Architecture refinements; ** Redundant PSUs, UPSes and fence methods emphasized. ** Monitoring multiple UPSes added via modified apcupsd ** Detailed monitoring of LSI-based RAID controllers and drives ** Discussion on hardware considerations for VM performance based on anticipated work loads * Naming convention changes to support the new AN!CDB dashboard[1] ** New alert system covered with fault and notable event alerting * Wider array of guest OSes are covered; ** Windows 7 ** Windows 8 ** Windows 2008 R2 ** Windows 2012 ** Solaris 11 ** FreeBSD 9 ** RHEL 6 ** SLES 11 Beyond that, the formatting of the tutorial itself has been slightly modified. I do think it is the easiest to follow tutorial I have yet been able to produce. I am very proud of this one! :D As always, feedback is always very much appreciated. Everything from typos/grammar mistakes, functional problems or anything else is very valuable. I take all the feedback I get and use it to helping make the tutorials better. Enjoy! Digimer, who now can now start the next tutorial in earnest! 1. https://alteeve.ca/w/AN!CDB -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?

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Support new AWS c3 instance type
by JacobV 05 Jan '14

05 Jan '14

When I try to launch the centos 6.4 ami on the newly release c3 instance type i get Client.UnsupportedOperation: The instance configuration for this AWS Marketplace product is not supported. Please see http://aws.amazon.com/marketplace/pp?sku=7w73f3vx0zywcfq1izrshkpjl for more information about supported instance types, regions, and operating systems. Do you just need to update the marketplace listing to support this or is there more build work and time required. Thank you, -jack

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Fwd: Building Xen on RHEL7
by Karanbir Singh 27 Dec '13

27 Dec '13

-------- Original Message -------- Subject: Building Xen on RHEL7 Date: Thu, 19 Dec 2013 18:57:22 +0000 From: Wei Liu <wei.liu2(a)citrix.com> To: <centos-virt(a)centos.org> Hi all This is a record of how I build Xen on RHEL 7. Hope this is helpful for people who want to package Xen for the upcoming CentOS 7. Basically it's not too much hassle to build Xen on RHEL 7. I'm in no way a packaging expert on RPM-based systems so I just list what's needed. The Yum repo I'm using is the public beta mirror at https://mirrors.fedoraproject.org/publiclist/RHEL/7/x86_64/. I cloned Xen tree from git://xenbits.xen.org/xen.git and used master branch. Dependences and requirements are listed by components. # To make top level ./configure pass: yum install -y gcc python-devel acpica-tools libuuid-devel ncurses-devel glib2-devel libaio-devel yajl-devel zlib-devel I also need to install dev86. I downloaded the latest version from http://www.debath.co.uk/dev86/ and installed it by hand. I noticed there's a dev86 package in Xen4Centos repo. We should be able to reuse that. And we also need to do ln -s /lib64/libcrypto.so.1.0.1e /lib64/libcrypto.so otherwise configure complains it cannot find libcrypto while that library is actually there. There's no markdown library in existing yum repo so some documents won't be built but that's not critical. And optionally if you want to use oxenstored: yum install -y ocaml # To build tools: ## To build hvmloader: yum install -y glibc-devel.i686 ## To build qemu-xen-traditional yum install -y SDL-devel ## To build qemu-xen-upstream yum install -y pixman-devel # To build stubdom yum install -y texinfo By now you should be able to just run "./configure; make dist" in top level Xen source code directory without getting any error (hopefully). There's warnings though because gcc 4.8 has stricter check than previous versions. I didn't build blktap, as RHEL 7 uses 3.10 kernel and Xen now has upstream QEMU, which should be able to cover all use cases. However default kernel only has frontend supports enabled (built as module), so we might need to alter its config or supply alternative Dom0 kernel. Have fun and Merry Christmas. Wei.

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Is Process for Building the Official Centos 6 AMIs Public?
by Harlan Barnes 24 Dec '13

24 Dec '13

Hello! I'm new to the list and have been reading through the archives in regards to the official Centos AMIs in the AWS Marketplace. From what I've gathered, a direct image download of the official Centos AMIs isn't currently available. But i was wondering if the process for building/configuring the official Centos AMIs was public ... i.e. "here's a code repository with some kickstart, config files and bash scripts" I'm sure it's more complicated than that but I have a limited imagination :-) I was hoping I could effectively recreate the image on our private cloud by reviewing the scripts/config for the official Centos AMI install and creating a process that worked there for us. With the goal being that the two images be as close as possible. Thanks! Harlan

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rhel7beta1 kernel and xen dom0
by Karanbir Singh 20 Dec '13

20 Dec '13

hi who wants to have a stab at the rhel7beta1 kernel ( 3.10 based ) to see what is needed to enable dom0 support ? I suspect it wont be much, but is merely a suspicion. regards, -- Karanbir Singh +44-207-0999389 | http://www.karan.org/ | twitter.com/kbsingh GnuPG Key : http://www.karan.org/publickey.asc

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Patch for domU packet loss
by Vasily Evseenko 15 Dec '13

15 Dec '13

Hi, I've found that dom0 <-> domU begin loss ~ 20% packets on high UDP traffic (with bridged virtual network setup). The fix is to increase txqueuelen on vif* interfaces which is very low (32) by default. Tested with Centos 6.5, 3.10.23-11.el6.centos.alt.x86_64 xen-4.2.3-26.el6.centos.alt P.S. This problem widely discussed in the internet, but nobody publish this fix (why?) http://serverfault.com/questions/442674/xen-pv-packet-loss http://lists.xen.org/archives/html/xen-users/2009-01/msg00381.html ...

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What do you use to provision domU's?
by Kenneth Porter 11 Dec '13

11 Dec '13

The subject says it all. I got CentOS 6.4 installed and then converted it to boot into the Xen kernel, using the C6.4 system as its dom0. But now I'm uncertain how to put a C6.4 domU on the result. Which tools are recommended?

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Re: [CentOS-virt] CentOS-virt Digest, Vol 76, Issue 3
by Hamond, Jean-Paul van 06 Dec '13

06 Dec '13

R Verzonden met mijn Windows Phone ________________________________ Van: centos-virt-request(a)centos.org<mailto:centos-virt-request@centos.org> Verzonden: ‎6-‎12-‎2013 09:35 Aan: centos-virt(a)centos.org<mailto:centos-virt@centos.org> Onderwerp: CentOS-virt Digest, Vol 76, Issue 3 Send CentOS-virt mailing list submissions to centos-virt(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-virt or, via email, send a message with subject or body 'help' to centos-virt-request(a)centos.org You can reach the person managing the list at centos-virt-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-virt digest..." Today's Topics: 1. Re: What do you use to provision domU's? (Johnny Hughes) 2. Re: What do you use to provision domU's? (Johnny Hughes) 3. Re: What do you use to provision domU's? (Dusty Mabe) 4. Re: What do you use to provision domU's? (Johnny Hughes) 5. Re: What do you use to provision domU's? (Kenneth Porter) ---------------------------------------------------------------------- Message: 1 Date: Tue, 03 Dec 2013 17:31:38 -0600 From: Johnny Hughes <johnny(a)centos.org> Subject: Re: [CentOS-virt] What do you use to provision domU's? To: centos-virt(a)centos.org Message-ID: <529E69DA.4030709(a)centos.org> Content-Type: text/plain; charset="iso-8859-1" On 12/02/2013 12:32 AM, Kenneth Porter wrote: > The subject says it all. I got CentOS 6.4 installed and then converted it > to boot into the Xen kernel, using the C6.4 system as its dom0. But now I'm > uncertain how to put a C6.4 domU on the result. Which tools are recommended? You can use virt-manager either from the Dom0 server (if it has all the GUI stuff and virt-manger installed) ... OR ... by connecting to the Dom0 using virt-manager from a Linux workstation. See my xen4centos libvirt article here: http://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt You can also use Xen XM tools with the default install ... OR ... if you do not plan on using libvirt at all, you can setup and use Xen XL tools (if using libvirt, you have to use xend and Xen XM): XM Tools: http://wiki.xen.org/wiki/XM XL Tools: http://wiki.xen.org/wiki/XL Thanks, Johnny Hughes

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