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1608 discussions

Move Xen Image to Another Server
by Wendy William 14 Jun '10

14 Jun '10

Dear, I want to move xen image (Dom-U) to another Server (both Servers use CentOS 5.5). Can I just copy the file to new server then create new Dom-U and pointed to the image file? Any information of link/doc/manual is appreciated. Thanks.

3 4

How to reinstall/repair Uninstalled Kernel-Xen?
by Wendy William 14 Jun '10

14 Jun '10

Dear, I try to reinstall kernel-xen by doing: # yum erase kernel-xen But, after reboot CentOS can't start because lost kernel-xen Please advise how to repair and install kernel-xen again. Thanks.

2 1

is the xenconsoled crash solved?
by Fernando Gleiser 11 Jun '10

11 Jun '10

One of our machines are being bitten by that bug, once every 2-4 weeks or so xenconsoled dies and all the VMs stop responding intil xenconsoled is restarted. I googled for it and I saw many people reporting it but no solution for it. Does anyone know if it is solved in 5.5? I can't upgrade the box (it's a production box) unless I can prove the problem will go away. thanks in advance

3 3

Is kvm ready for prime time?
by Lars Hecking 11 Jun '10

11 Jun '10

Hi all, I've started playing with kvm on CentOS 5.5, with not much success so far. In a nutshell, I have the same problem as http://lists.centos.org/pipermail/centos-virt/2010-April/001854.html I followed the RHEL5 virtualization guide to set up a bridge interface br0, and then used virt-install (rather than virt-manager - I like automation) to set up the vm. It hangs at some point. The command line is slightly modified from the one I was using with xen. Running it with -d shows that the correct hypervisor is used and the network install source is found. Otherwise, I'm fresh out of ideas. # lsmod|grep kvm kvm_intel 86920 0 kvm 226208 2 ksm,kvm_intel # uname -a Linux x3250 2.6.18-194.3.1.el5 #1 SMP Thu May 13 13:08:30 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux # virt-install -r 512 -n test -f /dev/vol0/lvol4 --nographics --os-type=linux --os-variant=rhel5.4 --accelerate -w bridge:br0 -l http://centos/centos/x86_64 -x ks=http://centos/centos/kickstart/ks.test.cfg -m 00:16:3e:30:4d:80 Starting install... Retrieving file .treeinfo... | 417 B 00:00 Retrieving file vmlinuz... | 1.9 MB 00:00 Retrieving file initrd.img... | 7.7 MB 00:00 Creating domain... | 0 B 00:00 Connected to domain test Escape character is ^] --------------------------------------------------------------- This message and any attachments may contain Cypress (or its subsidiaries) confidential information. If it has been received in error, please advise the sender and immediately delete this message. ---------------------------------------------------------------

5 9

allocating pci resources starting at a8000000 (gap: a0000000:5ec00000)
by MtK - 012 06 Jun '10

06 Jun '10

Hello, I've installed XEN according to this tutorial: <http://www.howtoforge.com/paravirtualization-with-xen-on-centos-5.4-x86_64> http://www.howtoforge.com/paravirtualization-with-xen-on-centos-5.4-x86_64 on the first XEN boot, it freezes for a very long time on: allocating pci resources starting at a8000000 (gap: a0000000:5ec00000) (the centos installation works fine) I then realized that this is caused when I set the BIOS to use Virtualization. (when I disable it, XEN boots up nicely). I have: <http://ark.intel.com/Product.aspx?id=27236> http://ark.intel.com/Product.aspx?id=27236 so I can't find any reason why this is not working... I’d appreciate any help on this matter. Regards, MtK

2 1

Xen 3.1.2 on CentOS 5.5 doesn't see all 4 CPUs
by Bryan A. Ignatow 04 Jun '10

04 Jun '10

Hello all, I've been digging around on this for a few days and I have not come up with a solution. I have a Compaq ProLiant DL580 (G1, the old tan Compaq) with 4 x 700MHz P-III CPUs and 11GB of memory. I've loaded CentOS 5.5 with Virtualization (Xen) + KVM and patched up to current (full KS packages file list at the end). When it boots, Xen only detects a single CPU as shown in the xm dmesg output (full output and the end): (XEN) Detected 701.650 MHz processor. (XEN) I/O virtualisation disabled (XEN) CPU0: Intel Pentium III (Cascades) stepping 04 (XEN) Platform timer overflows in 2 jiffies. (XEN) Platform timer is 1.193MHz PIT (XEN) Brought up 1 CPUs [...] (XEN) Dom0 has maximum 1 VCPUs The system shows all 4 CPUs when booted outside of Xen. Any ideas on Xen options or anything I can try to see if I can get all 4 CPUs? Thanks, Bryan ___________________________________________________________________ __ __ _____ _ ____ _ ___ _ _ _____ _ _ ____ \ \/ /___ _ __ |___ / / | |___ \ / |/ _ \| || | |___ / / | ___| | ___| \ // _ \ _ \ |_ \ | | __) |__| | (_) | || |_ |_ \ | | / _ \ |___ \ / \ __/ | | | ___) || |_ / __/|__| |\__, |__ _| ___) || || __/ |___) | /_/\_\___|_| |_| |____(_)_(_)_____| |_| /_/ |_|(_)____(_)_(_)___|_|____/ http://www.cl.cam.ac.uk/netos/xen University of Cambridge Computer Laboratory Xen version 3.1.2-194.3.1.el5 (mockbuild(a)centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) Thu May 13 13:02:01 EDT 2010 Latest ChangeSet: unavailable (XEN) Command line: dom0_mem=1024M crashkernel=128M@16M (XEN) Video information: (XEN) VGA is text mode 80x25, font 8x16 (XEN) VBE/DDC methods: V2; EDID transfer time: 2 seconds (XEN) Disc information: (XEN) Found 2 MBR signatures (XEN) Found 2 EDD information structures (XEN) Xen-e820 RAM map: (XEN) 0000000000000000 - 000000000009d800 (usable) (XEN) 000000000009d800 - 00000000000a0000 (reserved) (XEN) 00000000000f0000 - 0000000000100000 (reserved) (XEN) 0000000000100000 - 00000000dfffc000 (usable) (XEN) 00000000dfffc000 - 00000000e0000000 (ACPI data) (XEN) 00000000fec00000 - 00000000fec10000 (reserved) (XEN) 00000000fee00000 - 00000000fee10000 (reserved) (XEN) 00000000fff80000 - 0000000100000000 (reserved) (XEN) 0000000100000000 - 00000002c0000000 (usable) (XEN) Kdump: 128MB (131072kB) at 0x1000000 (XEN) System RAM: 10751MB (11009636kB) (XEN) Xen heap: 9MB (9740kB) (XEN) Domain heap initialised: DMA width 32 bits (XEN) PAE enabled, limit: 16 GB (XEN) Local APIC disabled by BIOS -- you can enable it with "lapic" (XEN) Using scheduler: SMP Credit Scheduler (credit) (XEN) Detected 701.650 MHz processor. (XEN) I/O virtualisation disabled (XEN) CPU0: Intel Pentium III (Cascades) stepping 04 (XEN) Platform timer overflows in 2 jiffies. (XEN) Platform timer is 1.193MHz PIT (XEN) Brought up 1 CPUs (XEN) xenoprof: Initialization failed. No APIC (XEN) *** LOADING DOMAIN 0 *** (XEN) elf_parse_binary: phdr: paddr=0xc0400000 memsz=0x28771c (XEN) elf_parse_binary: phdr: paddr=0xc0688000 memsz=0x164000 (XEN) elf_parse_binary: memory: 0xc0400000 -> 0xc07ec000 (XEN) elf_xen_parse_note: GUEST_OS = "linux" (XEN) elf_xen_parse_note: GUEST_VERSION = "2.6" (XEN) elf_xen_parse_note: XEN_VERSION = "xen-3.0" (XEN) elf_xen_parse_note: VIRT_BASE = 0xc0000000 (XEN) elf_xen_parse_note: PADDR_OFFSET = 0xc0000000 (XEN) elf_xen_parse_note: ENTRY = 0xc0400000 (XEN) elf_xen_parse_note: HYPERCALL_PAGE = 0xc0401000 (XEN) elf_xen_parse_note: FEATURES = "writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel" (XEN) elf_xen_parse_note: PAE_MODE = "yes" (XEN) elf_xen_parse_note: LOADER = "generic" (XEN) elf_xen_addr_calc_check: addresses: (XEN) virt_base = 0xc0000000 (XEN) elf_paddr_offset = 0xc0000000 (XEN) virt_offset = 0x0 (XEN) virt_kstart = 0xc0400000 (XEN) virt_kend = 0xc07ec000 (XEN) virt_entry = 0xc0400000 (XEN) Xen kernel: 32-bit, PAE, lsb (XEN) Dom0 kernel: 32-bit, PAE, lsb, paddr 0xc0400000 -> 0xc07ec000 (XEN) PHYSICAL MEMORY ARRANGEMENT: (XEN) Dom0 alloc.: 000000003c000000->000000003e000000 (253952 pages to be allocated) (XEN) VIRTUAL MEMORY ARRANGEMENT: (XEN) Loaded kernel: c0400000->c07ec000 (XEN) Init. ramdisk: c07ec000->c0efec00 (XEN) Phys-Mach map: c0eff000->c0fff000 (XEN) Start info: c0fff000->c0fff46c (XEN) Page tables: c1000000->c100f000 (XEN) Boot stack: c100f000->c1010000 (XEN) TOTAL: c0000000->c1400000 (XEN) ENTRY ADDRESS: c0400000 (XEN) Dom0 has maximum 1 VCPUs (XEN) elf_load_binary: phdr 0 at 0xc0400000 -> 0xc068771c (XEN) elf_load_binary: phdr 1 at 0xc0688000 -> 0xc0733cc4 (XEN) Initrd len 0x712c00, start at 0xc07ec000 (XEN) Scrubbing Free RAM: ...............................................................................................done. (XEN) Xen trace buffers: disabled (XEN) Std. Loglevel: Errors and warnings (XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings) (XEN) Xen is relinquishing VGA console. (XEN) *** Serial input -> DOM0 (type \047CTRL-a\047 three times to switch input to Xen). (XEN) Freed 108kB init memory. ___________________________________________________________________ %packages @admin-tools @base @core @dns-server @development-libs @development-tools @dialup @editors @engineering-and-scientific @ftp-server @gnome-desktop @gnome-software-development @games @graphical-internet @graphics @java @java-development @kvm @legacy-network-server @mail-server @mysql @network-server @office @printing @ruby @server-cfg @sound-and-video @system-tools @text-internet @xen @web-server @smb-server @x-software-development @base-x system-config-kickstart system-config-netboot system-config-netboot-cmd keyutils dmraid-events-logwatch kexec-tools gpart iscsi-initiator-utils trousers bridge-utils authd fipscheck hardlink x86info device-mapper-multipath hfsutils perl-XML-SAX perl-XML-Twig perl-XML-Dumper perl-TimeDate perl-libxml-perl perl-Convert-ASN1 perl-XML-NamespaceSupport perl-DateManip perl-Crypt-SSLeay perl-Mozilla-LDAP perl-LDAP perl-XML-Grove python-imaging perl-Archive-Zip pexpect imake gcc-objc expect java-1.6.0-openjdk nasm statserial xferstats libsane-hpaio libvirt-cim Virtualization-en-US libcmpiutil telnet-server rsh-server tftp-server mailman postfix squirrelmail cyrus-imapd mod_auth_mysql mysql-devel mysql-bench php-mysql openldap-servers vnc-server freeradius system-config-bind system-config-boot rdesktop lsscsi uucp festival tsclient x3270 lslk nmap-frontend wireshark-gnome audit mrtg net-snmp-utils sysstat gnome-nettool iptraf vlock dstat Virtualization-en-US php-odbc mod_nss mod_auth_mysql mod_authz_ldap php-mysql xorg-x11-xbitmaps openmotif-devel mesa-libGLU-devel libXp-devel xorg-x11-resutils xorg-x11-xsm xorg-x11-server-Xnest xorg-x11-xfs-utils xorg-x11-server-Xvfb -spamassassin ___________________________________________________________________ -- Bryan A. Ignatow bryan(a)ignatow.org

3 4

4 CPU with WinXP on Centos 5.5 KVM?
by Marcelino Mata 28 May '10

28 May '10

Has anyone had any success getting WinXP 32bit to use 4 CPU's under Centos 5.5 KVM? I have tried everything and the best I can get is 2 CPU's. I tried everything listed here http://www.linux-kvm.com/content/running-windows-smp-guests I am using the VIRTIO drivers. Is this known limitation of KVM-83-164 (Centos5 release) with WinXP 32bit? I think there are reports of it working with 32bit Windows 2003 (or was it Windows 2008?). I know KVM is granting the 4 CPU's since Linux VM can use 4 CPU's on the same computer. Thanks, Marcelino Marcelino Mata Engineering Technology Specialist Multimatic Technical Centre 85 Valleywood Drive Markham, ON Canada L3R 5E5 Tel. +1 905 470 0025 CONFIDENTIALITY NOTE: This email (and attachments, if any) contain(s) information that is PRIVATE and CONFIDENTIAL, and may be LEGALLY PRIVILEGED or otherwise exempt from disclosure under applicable law. All copyright is reserved, and no right or license is granted to duplicate or publish the content of this email or to forward it to third parties, without, in each case, specific permission. If you have received this email in error, you must not copy, distribute, retain or use this email or the information contained in it for any purpose (other than to notify the sender). If you believe that you are not the intended recipient of this email, please contact the sender immediately and delete this email from your computer system (including any archive or other storage facilities). Thank you.

5 6

Libvirt NAT-based network 2x-4x faster than Libvirt routed network?
by Kenni Lund 28 May '10

28 May '10

Hi Is it expected behaviour that a libvirt NAT-based network is faster than a libvirt routed network? I would guess that the routed network would be the fastest one in all cases, but I'm seeing the opposite in my setup. On a 100mbit internet connection, the routed network tops at 4mbyte/sec, while the nat-based network goes all the way to 10mbyte/sec. I've spend the last 6 hours on trying to figure out the cause of this, changing settings, reinstalling the system, but the problem persists and I can't find the cause of it. It is a clean and fairly simple setup: - Clean installation of CentOS 5.5 - Installation of kvm+libvirt+virt-manager+xorg - iptables service disabled - 1 public IP for the host (xxx.yyy.zzz.215) on a /32 subnet with xxx.yyy.zzz.193 as gateway - 3 public IP for the routed network (xxx.yyy.zzz.251-253) on a /26 subnet with the same gateway as the host - 1 virtual machine with either the NAT or the routed libvirt network assigned I have no networking connection errors or similar, it works perfectly with both the NAT and the routed network, but the routed network is just 2-4 times slower than the NAT one. Do you have any suggestions of what the problem might be? When I look at the iptables rules generated by libvirt, and the routing table, everything looks fine AFAICT. Traceroute from guest doesn't reveal anything either. Ping times from the two networks are similar, so the main issue seems to be throughput. Any help or pointers to what I should look at, is highly appreciated... :) I've copy pasted some of my relevant system configuration into pastebin: http://pastebin.com/jtTrHLqA Thank you, Kenni

4 6

How to connect a guest to a fixed routable address?
by James B. Byrne 27 May '10

27 May '10

I am experimenting with kvm on a quad x86_64 running CentOS-5.5. I have created my first virtual guest and it seems to run fine. Now I wish to assign that particular guest to a fixed, public IP address. There seems to be at least two ways to proceed and I am soliciting comments on the preferred approach. In the first instance I can use brctl to create a bridged 'shared physical device' and presumably add that device to the network configuration of the guest, assigning the IP connection details there. In the second, I can continue to use the virtual networking system, albeit with fixed private as opposed to DHCP assigned addresses. In this case I gather that I must use ifconfig to add public IP addresses to the eth0 interface of the host and use iptables to route the public to the private address. Firstly, are my inferences correct? Are there any other approaches that I cannot discern? If these are the only two methods then which is the preferred one? I get the sense that bridging works in a manner that permits only one guest to access that physical device, however the documentation is not explicit on the matter. I have looked extensively for guidance but I suspect that a great deal of what I have read is somewhat dated and likely to cause me more trouble than help. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

2 2

Xen 3.4 on CentOS 5.5
by C.J. Adams-Collier 26 May '10

26 May '10

Hey all, I'm trying to get Xen working well on CentOS 5.5. We currently build from source, and this is causing me all sorts of problems. What steps would be required to build an "official" CentOS 5.5 package of Xen 3.4? I am aware of the one on Gitmo, but this is not official. Looking forward to your responses, C.J.

2 1

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