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• missing network usage through iptables

  - by Purres

  I inserted a rule to iptables to track the input usage to a certain ip address. The vps server's IP is 192.168.1.5 and the guest os's IP is 192.168.1.115. I ran 'yum update' inside the guest OS to get some network traffic. Then I ran iptables -vnL from the hypervisor. However it only showed network usage to the host, but not to the guest. Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target source destination 0 0 0.0.0.0/0 0.0.0.0/0 destination IP range 192.168.1.115-192.168.1.115 1853 114K 0.0.0.0/0 0.0.0.0/0 destination IP range 192.168.1.5-192.168.1.5 I ran tcpdump and the log showed that there're data packets to the guest os. 16:17:43.932514 IP mirrordenver.fdcservers.net.http > 192.168.1.115.34471: Flags [.], seq 17694667:17696115, ack 1345, win 113, options [nop,nop,TS val 1060308643 ecr 1958781], length 1448 16:17:43.932559 IP 192.168.1.115.34471 > mirrordenver.fdcservers.net.http: Flags [.], ack 17696115, win 15287, options [nop,nop,TS val 1958869 ecr 1060308643], length 0 Why the guest OS network usage couldn't be tracked? iptables -L will return the INPUT chain as following: Chain INPUT (policy ACCEPT) target prot opt source destination all -- anywhere anywhere destination IP range 192.168.1.115-192.168.1.115 all -- anywhere anywhere destination IP range 192.168.1.5-192.168.1.5 all -- anywhere anywhere

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• Dynamips Virtual Router not pinging external host after bridging

  - by maiky

  I have setup a virtual router image with dynamips and setup bridging between tap0 interface of the virtual router and eth0 and br0 with commands [root@cisco_host]# brctl addbr br0 [root@cisco_host]# ifconfig br0 up [root@cisco_host]# ifconfig eth1 0.0.0.0 [root@cisco_host]# brctl addif br0 eth1 [root@cisco_host]# ifconfig br0 192.168.0.100 netmask 255.255.255.0 up In dynagen configuration I have: f0/0 = NIO_tap:tap0 So, [root@cisco_host]# brctl addif br0 tap0 [root@cisco_host]# ifconfig tap0 up router(config)#int fa0/0 router(config-if)#ip address 192.168.0.101 255.255.255.0 router(config-if)#no shutdown After the configuration above I was expecting that from inside the router I could ping an external machine with IP 192.168.0.1 Actually from the host I can ping the external host 192.168.0.1 as well as 192.168.0.100 and 192.168.0.101. So what am I missing here? tap0 is bridged with br0 and in turn with eth1. So why the router is not pingable from 192.168.0.1 and vice-versa??

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• Trying to run QEMU with a file as hda

  - by Felix

  I'm trying to run QEMU and use a simple file on the host system as the guest's hard drive. Here's what I attempted so far: $ dd if=/dev/zero of=/home/felix/vm/archlinux.img bs=1MB count=8192 8192+0 records in 8192+0 records out 8192000000 bytes (8.2 GB) copied, 86.6054 s, 94.6 MB/s $ qemu -hda /home/felix/vm/archlinux.img -cdrom archlinux-2009.08-netinstall-i686.iso -boot d Then I try to install Archlinux to that file. It goes pretty well (it's able to format it from what I can tell) until I start installing packages, when I get errors like this: And, of course, everything goes downhill from there (unable to mount the partition, corrupted files, ...). What am I doing wrong? Note: I'm just doing this for entertainment purposes. I don't intend to actually use this on servers or anything. The only use I can think of for this kind of installation would be to actually get an 8GB USB stick and dd that file to it and wham! You have a bootable stick with a fully fledged and customized OS, and without torturing the stick through the installation.

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• KVM-Guests can't get past bridge - no internet connection

  - by tmn29a

  I'm running a backported KVM on a Debian Squeeze. ATM the KVM-Guest can't connect to the internet through the bridge I have set up. The guests can reach each other, the host but nothing outside. I can neither ping, nslookup or do anything to a remote address. The guest are configured to have a static IP. When I didn;t have the bridge but a virtual bridge (the KVM-default) the guest could connect fine. After setting up the bridge things broke, so I think the problem lies there. # The loopback network interface auto lo br0 iface lo inet loopback # Bonding Interface auto bond0 iface bond0 inet static address 10.XXX.XXX.84 netmask 255.255.255.192 network 10.XXX.XXX.64 gateway 10.XXX.XXX.65 slaves eth0 eth1 bond_mode active-backup bond_miimon 100 bond_downdelay 200 bond_updelay 200 iface br0 inet static bridge_ports eth0 eth1 address 172.xxx.xxx.65 broadcast 172.xxx.xxx.127 netmask 255.255.255.192 gateway 172.xxx.xxx.65 bridge_stp on bridge_maxwait 0 Thanks in advance for your help !

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• Is it possible to a VM inside a VM (e.g., KVM on Vmware)?

  - by lorin

  I'd like to do some development on Eucalyptus, an open source project which provides an Amazon EC2 interface for launching virtual machine instances on a collection of privately managed nodes. I'd really like to be able to do some of the development on my desktop, rather than having to deploy Eucalyptus on our shared local cluster each time I make a change to the source code. (Especially since there are a group of us sharing that test cluster). Unfortunately, my desktop machine is a Mac, which won't run Eucalyptus natively. I do have VMWare Fusion, and it would be really nice if I could do my Eucalyptus testing inside a VMWare instance. The problem is, to test out Eucalyptus, it will have to launch (KVM or Xen) VM instances. I've got no idea if it's possible to actually launch a KVM or Xen instance inside a VMWare instance.

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• why does Virtualbox use 15-20% CPU when VM is paused?

  - by laramichaels

  Hello, I run VirtualBox 3.1 on Ubuntu with a Win XP guest. I have noticed to my surprise that when I pause the VM (its screen grays out) VirtualBox continues using 15-20% of the host's CPU. Is this normal behavior? Is there a way to avoid it? (Without saving the state of the VM and exiting VirtualBox.) Thanks for any insights! ~lara

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• dnsmasq(as DHCP server) isn't working in KVM+libvirt envirmont

  - by user2681054

  I'm using dnsmasq as DHCP server in VM environment. But It didn't working. I disabled basic DHCP feature in libvirt. <network> <name>default</name> <uuid>84da0678-e56d-8fc2-6f8b-e8eba784849a</uuid> <forward mode='nat'/> <bridge name='virbr0' stp='on' delay='0' /> <mac address='52:54:00:7B:64:0B'/> <ip address='192.168.122.1' netmask='255.255.255.0'> </ip> </network> As you can see, I removed this tag! <dhcp> <range start='192.168.122.2' end='192.168.122.254' /> </dhcp> And I installed dnsmasq in Host machine. During installation dnsmasq, there was an error message about 127.0.0.1.(dnsmasq: failed to create listening socket for 127.0.0.1) So I commented out listen-address option, and added dhcp-range/dhcp-option options, like this. listen-address=127.0.0.1 dhcp-range=192.168.122.100,192.168.122.200,24h dhcp-option=option:router,192.168.122.1 That's all I've done with dnsmasq. But guest VM couldn't get IP address from host which is dnsmasq server running. After that , I installed isc-dhcp-server instead of dnsmasq.... and it works! But I still want to use dnsmasq instead of isc-dhcp-server. Are there any helping hands? I disabled host machine's firewall. I've heard that libvirt basically use dnsmasq. Is this the reason why I couldn't use dnsmasq in libvirt environment?

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• Need clear steps on how to convert a Windows 2000 Server to a XenServer VM

  - by Jay

  The source system is not local. The target host running XenServer is not local. The source system is running Windows 2000 Server SP4 and has 1 disk split into 6 partitions, all NTFS: C: 6 GB (boot) D: 15 GB E: 6 GB F: 6 GB G: 5 GB H: 26 GB Most of the partitions are mostly mostly full ( 60%). What is the most straightforward way to do a P2V migration of the server? I can do minor database & data syncs after the P2V is successful & running as a VM within XenServer, it's just getting to that point which is not clear. The option of installing a Windows 2000 Server from scratch is not available, I need to convert the existing physical server as-is into a VM to be hosted within a XenServer environment. I've looked at XenConvert but it maxes out on converting only 4 partitions in one shot, and I'm not certain how to account for the 2 extra partitions. I'm not familiar with XenServer but it's my only option right now to go P2V.

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• Guests can't access KVM host server by name although nslookup and dig returns correct record

  - by user190196

  So I have a KVM host that also runs an apache server with some yum repos. The VM guests are connected to the default virtual network, which is configured to offer DHCP and forwarding with NAT on virbr0 (192.168.12.1). The guests can successfully access the yum repos on the host by IP address, so for example curl 192.168.122.1/repo1 returns the content without problems. But I'd like to have the guests be able to reach the web server on the host by name rather IP address. I added the desired name record to the host's /etc/hosts file and libvirt's dnsmasq service seems to be serving that correctly to the guests since nslookup and dig successfully resolve the name on the guests: [root@localhost ~]# nslookup repo Server: 192.168.122.1 Address: 192.168.122.1#53 Name: repo Address: 192.168.122.1 [root@localhost ~]# dig repo ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6 <<>> repo ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55938 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;repo. IN A ;; ANSWER SECTION: repo. 0 IN A 192.168.122.1 ;; Query time: 0 msec ;; SERVER: 192.168.122.1#53(192.168.122.1) ;; WHEN: Tue Sep 17 02:10:46 2013 ;; MSG SIZE rcvd: 38 But curl/ping/etc still fail: [root@localhost ~]# curl repo curl: (6) Couldn't resolve host 'repo' While a request via ip address works: [root@localhost ~]# curl 192.168.122.1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <html> <head> <title>Index of /</title> [...] Same with ping: [root@localhost ~]# ping repo ping: unknown host repo [root@localhost ~]# ping 192.168.122.1 PING 192.168.122.1 (192.168.122.1) 56(84) bytes of data. 64 bytes from 192.168.122.1: icmp_seq=1 ttl=64 time=0.110 ms 64 bytes from 192.168.122.1: icmp_seq=2 ttl=64 time=0.146 ms 64 bytes from 192.168.122.1: icmp_seq=3 ttl=64 time=0.191 ms ^C --- 192.168.122.1 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2298ms rtt min/avg/max/mdev = 0.110/0.149/0.191/0.033 ms I tried adding repo 192.168.122.1 to the guests' /etc/hosts files but still no dice. Also tried changing guests' /etc/nsswitch.conf with both: hosts: files dns and hosts: dns files I've read the relevant libvirt documentation and I'm not sure where else to learn more about this and be able to move forward with it.

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• My HiperV Virtual Server stops with critical error.

  - by Svisstack

  Hello, I have problem with my HyperV virtual server, he minute after start was stopping with critical error. Where in the system i can find more information about this error?

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• CPU's on Hyper-V host system is just idling, even though VM's are at full throttle

  - by Bjørn

  Hello, I have a server that is running Windows 2008 64 bit Hyper-V, with 8 gigs of RAM and Intel Xeon X3440 @ 2.53 Ghz, which gives me 8 logical cores in the performance monitor on the host system. I have set up three Virtual Machines, all running Windows 2008 32 bit. Build server, running Team City Staging server SQL Server, running SQL Server 2005 These three machines are running very sluggishly, they are at 100% cpu even though the host system is barely using any cpu at all, typically below 10% total. Could anyone please give some tips as to the best setup for CPU allocating? Should I have set each server to have two cores, or should I increase this number above the total number of cores on the host? What is a good number to set on the Virtual Machine Reserve and Virtual Machine Limit? Is 8 gigs of physical RAM insufficient for 3 VM's? Thanks for reading. :)

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• Blank desktop when logging into a Virtualized Windows 2008 Terminal Server?

  - by Rachel

  We have a Virtualized Terminal Server running Windows Server 2008. When the admin user logs in, everything is fine. When anyone else logs in, their desktop and start menu is blank (they have the taskbar, start button, and quick launch links though). If I go into Windows Explorer, I can see icons in their desktop folder (although the icon image is missing and it is just displaying the generic icon), but can't run any of them. If I login with a user that is part of the Administrator group in Active directory, I get the same behavior except I can launch the programs found in the Desktop Folder of Windows Explorer. I cannot drag these items out onto the desktop though - The cursor doesn't allow me to drop them. From Task Manager I can see that explorer.exe and dwm.exe are both running. The Authenticated Users and Interactive groups are both under the Users group, along with our network's Domain Users group. Does anyone know why this is happening and how I can fix it? Also, not sure if it's related but about 1 in every 3 logins just hangs at a completely blank blue screen (no start button, taskbar, or quick launch buttons) and needs to be disconnected / reset by an admin. Edit I just noticed that the desktop itself doesn't even respond to click events. It's almost like the entire desktop is missing. At first I thought it didn't respond to right-click events because of an AD policy, but then I noticed if you open the Start Menu and click the desktop, the start menu doesn't shut like it should

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• Slow performance by PHP directory operations on virtual machine (Ubuntu libvirt)

  - by thonixx

  Some days ago I installed an Ubuntu server and two running virtual machines with libvirt. Everything works fine except one performance problem. Everytime when I call a PHP script with directory operations the operations are very slow and not performant. Here is an example: http://zother.white-tiger.ch/ And here you see an example without a directory operation and how fast it is: http://michaeltanner.ch/ It's all on the same virtual server. The virtual machine uses 6 cores (8 are available) and 7500 megabytes RAM (8 Gigabyte are available). The disk image format is qcow2. How can I improve the performance?

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• KVM Guest with NAT + Bridged networking

  - by Daniel

  I currently have a few KVM Guests on a dedicated server with bridged networking (this works) and i can successfully ping the outside ips i assign via ifconfig (in the guest). However, due to the fact i only have 5 public ipv4 ip addresses, i would like to port forward services like so: hostip:port - kvm_guest:port UPDATE I found out KVM comes with a "default" NAT interface, so added the virtual NIC to the Guest virsh configuration then configured it in the Guest, it has the ip address: 192.168.122.112 I can successfully ping 192.168.122.112 and access all ports on 192.168.122.112 from the KVM Host, so i tried to port forward like so: iptables -t nat -I PREROUTING -p tcp --dport 5222 -j DNAT --to-destination 192.168.122.112:2521 iptables -I FORWARD -m state -d 192.168.122.0/24 --state NEW,RELATED,ESTABLISHED -j ACCEPT telnet KVM_HOST_IP 5222 just hangs on "trying" telnet 192.168.122.112 2521 works [root@node1 ~]# tcpdump port 5222 tcpdump: WARNING: eth0: no IPv4 address assigned tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 23:43:47.216181 IP 1.152.245.247.51183 > null.xmpp-client: Flags [S], seq 1183303931, win 65535, options [mss 1400,nop,wscale 3,nop,nop,TS val 445777813 ecr 0,sackOK,eol], length 0 23:43:48.315747 IP 1.152.245.247.51183 > null.xmpp-client: Flags [S], seq 1183303931, win 65535, options [mss 1400,nop,wscale 3,nop,nop,TS val 445778912 ecr 0,sackOK,eol], length 0 23:43:49.415606 IP 1.152.245.247.51183 > null.xmpp-client: Flags [S], seq 1183303931, win 65535, options [mss 1400,nop,wscale 3,nop,nop,TS val 445780010 ecr 0,sackOK,eol], length 0 7 packets received by filter 0 packets dropped by kernel [root@node1 ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state NEW,RELATED,ESTABLISHED Chain OUTPUT (policy ACCEPT) target prot opt source destination All help is appreciated. Thanks.

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• slow network in centos5 VM with centos5 host running KVM

  - by dan

  I setup KVM following the guide here: http://www.cyberciti.biz/faq/centos-rhel-linux-kvm-virtulization-tutorial/ I setup a bridged network and it worked fine except that the transfer speed is 200KB/s instead of the gigabit speed that I get on the host machine by itself. I tried editing the guest network settings to set "model=virtio" http://wiki.libvirt.org/page/Virtio but this just moves ifconfig-eth0 to ifconfig-eth0.bak in the VM and networking doesn't work at all. I tried moving ifconfig-eth0 back and starting up eth0, which works, but now the transfer speed is ~ 60KB/s I have no idea what else to try. Any suggestions would be greatly appreciated.

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• How to avoid downtime when resizing virtual machines

  - by Ivan Buttinoni

  Many IaaS provider offer dynamic upgrade/downgrade of RAM and cores. Usually a Linux VM has to be rebooted to apply these changes. Sometimes, things like VMware tools or other guest services are well integrated so the upgrades to resources are immediately available, but the downgrades still need reboot. How can I solve this issue, so that when downgrading resources I do not have to reboot my guests?

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• KVM/Libvirt bridged/routed networking not working on newer guest kernels

  - by SharkWipf

  I have a dedicated server running Debian 6, with Libvirt (0.9.11.3) and Qemu-KVM (qemu-kvm-1.0+dfsg-11, Debian). I am having a problem getting bridged/routed networking to work in KVM guests with newer kernels (2.6.38). NATted networking works fine though. Older kernels work perfectly fine as well. The host kernel is at version 3.2.0-2-amd64, the problem was also there on an older host kernel. The contents of the host's /etc/network/interfaces (ip removed): # Loopback device: auto lo iface lo inet loopback # bridge auto br0 iface br0 inet static address 176.9.xx.xx broadcast 176.9.xx.xx netmask 255.255.255.224 gateway 176.9.xx.xx pointopoint 176.9.xx.xx bridge_ports eth0 bridge_stp off bridge_maxwait 0 bridge_fd 0 up route add -host 176.9.xx.xx dev br0 # VM IP post-up mii-tool -F 100baseTx-FD br0 # default route to access subnet up route add -net 176.9.xx.xx netmask 255.255.255.224 gw 176.9.xx.xx br0 The output of ifconfig -a on the host: br0 Link encap:Ethernet HWaddr 54:04:a6:8a:66:13 inet addr:176.9.xx.xx Bcast:176.9.xx.xx Mask:255.255.255.224 inet6 addr: fe80::5604:a6ff:fe8a:6613/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:20216729 errors:0 dropped:0 overruns:0 frame:0 TX packets:19962220 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:14144528601 (13.1 GiB) TX bytes:7990702656 (7.4 GiB) eth0 Link encap:Ethernet HWaddr 54:04:a6:8a:66:13 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:26991788 errors:0 dropped:12066 overruns:0 frame:0 TX packets:19737261 errors:270082 dropped:0 overruns:0 carrier:270082 collisions:1686317 txqueuelen:1000 RX bytes:15459970915 (14.3 GiB) TX bytes:6661808415 (6.2 GiB) Interrupt:17 Memory:fe500000-fe520000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:6240133 errors:0 dropped:0 overruns:0 frame:0 TX packets:6240133 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6081956230 (5.6 GiB) TX bytes:6081956230 (5.6 GiB) virbr0 Link encap:Ethernet HWaddr 52:54:00:79:e4:5a inet addr:192.168.100.1 Bcast:192.168.100.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:225016 errors:0 dropped:0 overruns:0 frame:0 TX packets:412958 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:16284276 (15.5 MiB) TX bytes:687827984 (655.9 MiB) virbr0-nic Link encap:Ethernet HWaddr 52:54:00:79:e4:5a BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) vnet0 Link encap:Ethernet HWaddr fe:54:00:93:4e:68 inet6 addr: fe80::fc54:ff:fe93:4e68/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:607670 errors:0 dropped:0 overruns:0 frame:0 TX packets:5932089 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:83574773 (79.7 MiB) TX bytes:1092482370 (1.0 GiB) vnet1 Link encap:Ethernet HWaddr fe:54:00:ed:6a:43 inet6 addr: fe80::fc54:ff:feed:6a43/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:922132 errors:0 dropped:0 overruns:0 frame:0 TX packets:6342375 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:251091242 (239.4 MiB) TX bytes:1629079567 (1.5 GiB) vnet2 Link encap:Ethernet HWaddr fe:54:00:0d:cb:3d inet6 addr: fe80::fc54:ff:fe0d:cb3d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:9461 errors:0 dropped:0 overruns:0 frame:0 TX packets:665189 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:4990275 (4.7 MiB) TX bytes:49229647 (46.9 MiB) vnet3 Link encap:Ethernet HWaddr fe:54:cd:83:eb:aa inet6 addr: fe80::fc54:cdff:fe83:ebaa/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1649 errors:0 dropped:0 overruns:0 frame:0 TX packets:12177 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:77233 (75.4 KiB) TX bytes:2127934 (2.0 MiB) The guest's /etc/network/interfaces, in this case running Ubuntu 12.04 (ip removed): # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 176.9.xx.xx netmask 255.255.255.248 gateway 176.9.xx.xx # Host IP pointopoint 176.9.xx.xx # Host IP dns-nameservers 8.8.8.8 8.8.4.4 The output of ifconfig -a on the guest: eth0 Link encap:Ethernet HWaddr 52:54:cd:83:eb:aa inet addr:176.9.xx.xx Bcast:0.0.0.0 Mask:255.255.255.255 inet6 addr: fe80::5054:cdff:fe83:ebaa/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14190 errors:0 dropped:0 overruns:0 frame:0 TX packets:1768 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2614642 (2.6 MB) TX bytes:82700 (82.7 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:954 errors:0 dropped:0 overruns:0 frame:0 TX packets:954 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:176679 (176.6 KB) TX bytes:176679 (176.6 KB) Output of ping -c4 on the guest: PING google.nl (173.194.35.151) 56(84) bytes of data. 64 bytes from muc03s01-in-f23.1e100.net (173.194.35.151): icmp_req=1 ttl=55 time=14.7 ms From static.174.82.xx.xx.clients.your-server.de (176.9.xx.xx): icmp_seq=2 Redirect Host(New nexthop: static.161.82.9.176.clients.your-server.de (176.9.82.161)) 64 bytes from muc03s01-in-f23.1e100.net (173.194.35.151): icmp_req=2 ttl=55 time=15.1 ms From static.198.170.9.176.clients.your-server.de (176.9.170.198) icmp_seq=3 Destination Host Unreachable From static.198.170.9.176.clients.your-server.de (176.9.170.198) icmp_seq=4 Destination Host Unreachable --- google.nl ping statistics --- 4 packets transmitted, 2 received, +2 errors, 50% packet loss, time 3002ms rtt min/avg/max/mdev = 14.797/14.983/15.170/0.223 ms, pipe 2 The static.174.82.xx.xx.clients.your-server.de (176.9.xx.xx) is the host's IP. I have encountered this problem with every guest OS I've tried, that being Fedora, Ubuntu (server/desktop) and Debian with an upgraded kernel. I've also tried compiling the guest kernel myself, to no avail. I have no problem with recompiling a kernel, though the host cannot afford any downtime. Any ideas on this problem are very welcome. EDIT: I can ping the host from inside the guest.

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• Speedup vmware esx guest hdd access

  - by Uwe

  Hello, we run several windows servers and windows clients on our vmware esx. One of the Windows 2003 Servers is a build-server with major HDD-reads/writes. as it is our build server. This machine was a hardware before and was virtualized to the ESX. Is there any way to increase the HDD-Performance? Perhaps there are special windows (guest) drivers? The files are stored on a Raid6 base. Performance graph of vmware infrastructure client shows reads up to 650 KBps and writes up to 4000 KBps. Thank you. Regards, Uwe

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• libvirt qemu/kvm migration problem

  - by Panda

  I am using kvm and libvirt on my Dell server. Now i am trying to migrate one virtual machine from a physical server to another. However, I failed everytime. In virsh on physicalServer1, I typed: virsh # migrate virtualmachine1 qemu+ssh://username@physicalServer2/system error: operation failed: migration to 'tcp:physicalServer2:49163' failed: migration failed Then I searched FAQ part on libvirt.org. It says: error: operation failed: migration to '...' failed: migration failed This is an error often encountered when trying to migrate with QEMU/KVM. This typically happens with plain migration, when the source VM cannot connect to the destination host. You will want to make sure your hosts are properly configured for migration (see the migration section of this FAQ) I managed to ssh physicalServer2 from a shell on virtualmachine1 so the above red part did not explain my failure. I also open ports on physicalServer2, iptables -L shows following information: Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps ACCEPT tcp -- anywhere anywhere state NEW tcp dpts:49152:49215 Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT) target prot opt source destination The /var/log/libvirt/qemu/virtualmachine1.log on physicalServer2: 2011-05-06 13:37:30.708: starting up LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.14 -enable-kvm -m 2048 -smp 1,sockets=1,cores=1,threads=1 -name openjudge-test -uuid a8c704bc-a4f9-90db-3e57-40e60b00aac1 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/virtualmachine1.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -boot c -drive file=/media/nfs/virtualmachine1.img,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=20,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=00:16:36:8a:22 :a0,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 127.0.0.1:2 -vga cirrus -incoming tcp:0.0.0.0:49163 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 char device redirected to /dev/pts/0 2011-05-06 13:37:30.915: shutting down The /var/log/libvirt/qemu/virtualmachine1.log on physicalServer1 is empty. Both physical servers are using Ubuntu 11.04. The libvirt and kvm used are installed by apt-get. The libvirt version is 0.8.8.

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• VMWare-Mount not recognizing virtual disks

  - by user36175

  I have two disks as .vmdk files, and four as .vdi files. I can boot virtual machines on them with Sun xMV VirtualBox, and they work just fine. However, I want to mount them on my local computer so I can read some files off of them without starting a virtual machine. I downloaded the vmware-mount utility, but I get this error, even when mounting .vmdk files, which should be VMWare images... Unable to mount the virtual disk. The disk may be in use by a virtual machine, may not have enough volumes or mounted under another drive letter. If not, verify that the file is a valid virtual disk file. Thinking it's a problem with the utility, I downloaded the SDK and made my own simple program in C to try to mount a disk. It just initializes the API, connects to it, then attempts to open the disk. I get this error, once again claiming it is not a virtual disk: **LOG: DISKLIB-DSCPTR: descriptor above max size: I64u **LOG: DISKLIB-LINK : "f:\programming\VMs\windowstrash.vdi" : failed to open (The file specified is not a virtual disk). **LOG: DISKLIB-CHAIN : "f:\programming\VMs\windowstrash.vdi" : failed to open (The file specified is not a virtual disk). **LOG: DISKLIB-LIB : Failed to open 'f:\programming\VMs\windowstrash.vdi' with flags 0x1e (The file specified is not a virtual disk). ** FAILURE ** : The file specified is not a virtual disk The files are clearly virtual disks, though, since I can actually mount and use them with a virtual machine. I tried detaching them from any VMs and trying again, but I got the same results. Any ideas? Maybe the "descriptor above max size" is a hint? Some more info: the .vmdk disks were created on other computers. I just copied them to mine and created new VMs around them, but they work fine. All the .vdi files were created on my machine. Not sure if that affects anything. Update: WinMount can mount the file.. so the problem seems to be with vmware-mount.

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• What are the advantages and disadvantages of the various virtual machine image formats?

  - by Matt

  Xen and Virtualbox etc both support a range of different virtual machine image formats. These are: vmdk, vdi, qcow & qcow2, hdd & vhd. Without any bias toward a particular product, I'm wanting to know what are the advantages and disadvantages of the various formats both from a features perspective, robustness and speed? One piece of info I discovered in a forum post was this: "The major difference is that VDI uses relatively large blocks (1MB) when growing an image, and thus has less overhead for block pointers etc. but isn't ultimately space efficient in the sense that if a single byte is non-zero in such a 1MB block the entire space is used. VMDK in contrast uses 64K blocks, and thus has more management overhead and generally a bit less disk space consumption What offsets this is that VDI is more efficient when it comes to snapshots." You might be thinking, I want to know this because I want to know which format to choose? Not exactly, I'm developing some software which utilises these formats and want to support one or more of them. Simplicity, large disks and ease of development are my main drivers.

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• links for 2010-05-05

  - by Bob Rhubart

  MASON Multiagent Simulation Toolkit on the NetBeans Platform Geertjan shares his recent work with George Mason University's Java-based multiagent simulation library core. (tags: java oracle netbeans) Slides: Oracle Virtualization: Making Software Easier to Deploy, Manage, and Support Slides from a presentation by Dean Samuels and Nirmal Grewal. (tags: oracle otn architect virtualization) @mayureshnirhali: Virtualizing Your Applications - Oracle Tech Days - Hyderbad 2010 Mayuresh Nirhali shares a video of his session describing support for various Virtualization technologies on the Oracle Solaris platform. (tags: oracle otn solaris virtualization)

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• Windows Server Configuration with Exchange, SQL Express and IIS

  - by Reafidy

  In our small office we are currently running a standalone tower server with WS 2008 R2, SQL Express and IIS. This server is going to be decommissioned and scrapped as its old and very noisy. We are going to purchase a new server with WS 2012 Standard and a heap of ram. It will still be a standalone server so it will be a domain controller, have SQL Express and IIS installed. We intend to install the hyper-v role and host a second virtual server to distribute the load. We are a small company and have only 15 staff members so its not a huge load on the server. Can a single server handle this type of installation, we don't want to purchase two servers. If so how should it be configured with regard to which software packages should be virtualized(if any). Redundancy is not a huge issue for us.

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• Bridging VirtualBox over OpenVPN TAP adapter on Windows

  - by Sean Edwards

  I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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• Intel VT-x disappeared after upgrading to Windows 8

  - by StepTNT

  I've upgraded to Windows 8 some weeks ago (MSDNAA!) and today, while I was trying to run a VM, I've noticed that VT-x is disabled. Now, Hyper-V works without problems, as I've tried emulating Win7 and WP8; but VirtualBox says that VT-x is disabled and it can't run my VM. Just to double check, I've run Securable by GRC and the Intel utility and both says that I've got VT-x off. Here comes the problem: VT-x is ON in my BIOS, and it worked flawlessly before upgrading to Windows 8! Any kind of suggestion? EDIT: My CPU supports VT-x: http://ark.intel.com/products/52219

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