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• Correlating %RDY in esxtop to CPU Usage in Guest

  - by Joe

  We recently upgrade a number of our VmWare hosts from 4.1 to 5.5 and noticed many of the VMs saw a step-wise jump in CPU usage as shown by the guest VM. We have not yet upgraded vmwaretools on any of the guests, but after investigating a bit more we saw many of these guests with a high %RDY value (50%) when viewed under esxtop. Unfortunately Linux (the guest) just shows "high CPU usage" without any insight into what portion of that is coming from %RDY (VmWare saying, "your guest is waiting on CPU from the host"). Are there any tools, /proc entries, etc. that can shed light on that information?

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• No resizing / Auto fit and Unity with Ubuntu 9.10 as Guest at all

  - by andyt25

  Hi! Problem 1: I have Ubuntu 9.10 installed and Workstation 7.01. All VMs (WinXP, Win7, Debian) I run do not resize any more. Problem 2: Unity Mode "Bar" works for short and disapears after seconds .. opened programs with unity mode work well, but the bar disapears History: I changed from Ubuntu 9.04 to 9.10, no VM was moved or changed. Latest VMWare Tools are installed, Auto fit Guest is activated. I am quite sure, that resizing / auto fitting and Unity Mode worked well with Ubuntu 9.04 thx for a hint, i hope didn't overlook something ..

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• CentOS 7: PHP high CPU usage

  - by HTF

  I've migrated Observium monitoring platform from CentOS 6.5 to CentOS 7 and I've noticed high CPU usage mostly caused by PHP, the CPU load increase when pooling script is running (poller-wrapper.py). Both VMs are running on the same physical host (KVM hypervisor) with exactly the same spec. I also tested this with a simple PHP benchmark script and CentOS 7 is slower - is it strictly related to PHP version (5.4.30 vs 5.4.16)? CentOS 6.5 [root@centos6:~]# php -f bench.php -------------------------------------- | PHP BENCHMARK SCRIPT | -------------------------------------- Start : 2014-08-19 22:26:34 PHP version : 5.4.30 Platform : Linux -------------------------------------- test_math : 1.610 sec. test_stringmanipulation : 1.416 sec. test_loops : 0.822 sec. test_ifelse : 0.729 sec. -------------------------------------- Total time: : 4.577 sec. CentOS 7 [root@centos7:~]# php -f bench.php -------------------------------------- | PHP BENCHMARK SCRIPT | -------------------------------------- Start : 2014-08-19 22:27:58 PHP version : 5.4.16 Platform : Linux -------------------------------------- test_math : 2.117 sec. test_stringmanipulation : 1.246 sec. test_loops : 1.174 sec. test_ifelse : 0.752 sec. -------------------------------------- Total time: : 5.289 sec. CPU usage increased right after migration:

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• Load balance between two virtual directories on a single machine running IIS6

  - by Emil Lerch

  I'm trying to simulate a production environment using a single VM. The production environment will have 3 servers behind a load balancer with sticky sessions. Production will be using IIS6. For development, I have no need to distribute load, but I want to make sure the team does not write code that relies on a single-server module. I have been hoping to set up two virtual directories and find some isapi filter to perform some rudimentary software load balancing, but I've been unable to locate anything suitable. isapi_rewrite comes close but there's no ability for a random rewrite. I don't even need sticky sessions since the application does not (in theory) rely on them. Is there something easy/free to do this, or am I stuck with multiple VMs and a NLB setup (which seems like total overkill)?

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• VMware Virtual vCenter and High Availability

  - by rufo

  To continue with this question: Should be Vmware vCenter server high available? According to the response there even if vCenter is down HA will continue to work. So, if my vCenter is a VM, using the express sql edition in the same VM, and that VM is hosted in the same cluster it manages (and the cluster is setup for HA): Am I correct to assume that if the host that hosts the vCenter goes down HA will vmotion the vCenter VM to another host and it will continue to function? BTW: my environment is small, two ESXi 5.0 hosts, with about 50 VMs, using iSCSI shared storaged for everything.

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• Recommended CPU upgrade for Dell Vostro 220 with Intel E7300 processor?

  - by Justin Grant

  I've got a Dell Vostro 220 with an E7300 processor (Intel Core 2 Duo @ 2.66Mhz, LGA775 socket) and I'm thinking about upgrading my processor so I can run Windows Server 2008 R2 with Hyper-V, which requires Hardware Virtualization support in the processor. Yes, I know this is underpowered for a server, I'm actually using it as a desktop machine but I'd like to use Hyper-V instead of Virtual Server (which I'm using now for running VMs). I'd like to keep the same motherboard and ideally the same CPU fan and RAM too. Any suggestions for a good, relatively cheap (under $200) processor upgrade?

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• Force an LXC container to use its own IP address

  - by emma sculateur

  Sorry if this question has already been asked. I could not find it, I have this setup : +---------------------------------------------------------------------------------------------+ |HOST | | | | +-------------------------------------------------+ | | | UBUNTU-VM | | | | | | | | +-------------------+ | | | | |UBUNTU-LXC | | +------------------+ | | | | 10.0.0.3/24 | 10.0.0.1/24 | |OTHER VM | | | | | eth0-----lxcbr0----------eth0-----------br0----------eth0 | | | | | | 192.168.100.2/24| 192.168.100.1/24 |192.168.100.3/24 | | | | +-------------------+ | +------------------+ | | +-------------------------------------------------+ | +---------------------------------------------------------------------------------------------+ When I ping 192.168.100.3 from my UBUNTU-LXC, the source IP address is automatically changed to 192.168.100.2 by UBUNTU-VM. It's like having a NAT, whereas I really want my UBUNTU-LXC to talk with it own IP address. Is there any way to do this ? Edit : these info may be relevant : I am using KVM +libvirt to set up my VMs Here is how I create my interface in UBUNTU-VM : <interface type='bridge'> <mac address='52:54:00:cb:aa:74'/> <source bridge='br0'/> <model type='e1000'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </interface>

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• Proxmox 31 + KVM routing + IP subnet + csf

  - by KeyJey

  We have proxmox 3.1 server in netzner with routuing network and IP subnet block. We want to implement csf firewall without interfering the traffic of the KVM VMs, what would be the easiest way? We readed that we should add this lines to /etc/csf/csfpost.sh: iptables -A FORWARD -d 144.76.223.155 -j ACCEPT iptables -A FORWARD -d 144.76.223.156 -j ACCEPT iptables -A FORWARD -d 144.76.223.157 -j ACCEPT iptables -A FORWARD -d 144.76.223.158 -j ACCEPT iptables -A FORWARD -d 144.76.223.159 -j ACCEPT iptables -A FORWARD -d 144.99.183.323 -j ACCEPT But when we enable csf the ping breaks, this is the network config (IPs are modified): auto lo iface lo inet loopback # device: eth0 auto eth0 iface eth0 inet static address 144.76.166.100 netmask 255.255.255.255 pointopoint 144.76.183.97 gateway 144.76.183.97 # for single IPs auto vmbr0 iface vmbr0 inet static address 144.76.166.100 netmask 255.255.255.255 bridge_ports none bridge_stp off bridge_fd 0 up ip route add 144.99.183.323/32 dev vmbr0 # for a subnet auto vmbr1 iface vmbr1 inet static address 144.76.166.100 netmask 255.255.255.248 bridge_ports none bridge_stp off bridge_fd 0 Thanks in advanced ! :)

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• Mounting to external NFS from a KVM VM.

  - by jbfink

  I've got a machine acting as a KVM host and another machine that NFS exports to that KVM host. I'd like for one of the internal VMs on the KVM host to be able to mount the NFS share. I can export to the KVM host IP fine and do a mount, but it doesn't work for the internal VM; I just get a failed error with "reason given by server: Permission denied". I've already tried to re-export the NFS from host to VM, but apparently doing two levels of NFS is not a Good Idea. Anyone know how I might get this working?

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• DC on Hyper V Host

  - by Saif Khan

  I've read a few similar questions but wasn't clear. I have a small office (13) users and recently purchased a new single server (this is all I have to work with for now). Server specs Memory - 16GB Drives - 6 SCSI (2TB) PROCESSOR - DUAL QUAD I plan on making the Hyper-V host the DC and then 2 VMs, one for a file server and the other an application server. Question - since I am restricted to this single server, would it be a big issue making the Hyper-V host the domain controller? Your input greatly appreciated.

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• How to Configure a vm on the same machine to do remote desktop [closed]

  - by Varun K

  I want to achieve following: (Note I'd like to get this done first of all with Win7 as both host and vm OS) Install Windows 7/xp/Windows 8 VM on Windows 7/Windows 8 host machine Configure it so that I can connect to it via remote desktop. This is because I use a screen reader software and audio output directly from VMs is not highly responsive. My software has a feature that it can connect to its copy on the remote machine (during rdp session) and then start receiving the text description which it translates into audio on the client (host in this case) machine. I want to know: Which VM software can let me do this – VMWare/Ms Virtual PC or VirtualBox If it is possible with every VM software, could you give an example of how to do this with anyone of these 3? Specifically, I know how to install Windows on VM (on both VMWare/Virtual PC), but don't really know how to configure a network such that I can remote into that VM from host OS. Hope it clarifies what I'm trying to achieve.

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• differencing disk opinions

  - by troth

  I've read about the performance issues with dfferencing disks but I still think there is a solid place for them and thats the os boot partition. If I'm going to have 20 vms on a csv based volume I don't won't to waste the 20+ gigs per guest just for the os boot. If I get a good base disk with all of the most used applications installed and have the pagefile located somewhere else I don't think the delta's would be that great thus it should not create a performance issue. Also in a SAN based csv volumes does it make any sense in having the pagefile go to a seperate csv volume? Any opinions on this? thanks

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• Kickstart installation: Unable to read package metadata.

  - by yacov

  I'm trying to install a CentOS OS with kickstart using HTTP as the installation source. The kickstart server and the installed server are both running on VMs on the same machine. after the anaconda system installer starts it fails with the following message: I tried installing two different versions of Centos(5.5 and 5.2), and they both pass a CDROM media test the manual installation provides. The only errors on the kickstart server side are some errors in the httpd log I consider irrelevant: [Sat Mar 12 23:25:19 2011] [error] [client 192.168.1.112] File does not exist: /tftpboot/linux-install/platforms/CentOS5.5/images/product.img [Sat Mar 12 23:25:19 2011] [error] [client 192.168.1.112] File does not exist: /tftpboot/linux-install/platforms/CentOS5.5/disc1 I tried searching the internet for days and haven't found any solution... Does anyone have any idea?

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• What are the limitations of virtual machines?

  - by j-g-faustus

  I'm considering setting up a virtual machine running Windows, with Ubuntu 10.10 as the host OS, for those cases where I have a Windows-only program. I understand that using a VM will lose some performance, but are there other limitations to what the OS in a virtual machine can do compared to "running on bare metal"? For example: Can a VM play games, like Dragon Age Origins or Civilization V? (Possibly with poorer framerates and/or lower resolution, but does it play at all?) Can a VM rip DVD/Blue-ray using AnyDVD or similar Windows program? Can a VM handle new hardware that requires dedicated drivers, but the drivers are only available for the OS running inside the VM? (Ex. graphics card, digital camera, card reader for smart card authentication.) Is it possible to say anything about "general limitations" of VMs, or is this wholly dependent on the specific VM?

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• need help writing puppet module for sssd.conf using Hiera

  - by mr.zog

  I need to build a module to manage /etc/sssd/sssd.conf on our Red Hat VMs. The sssd modules published on the forge don't seem to do what I want, nor do I feel like forking any of them. I want to keep all the configuration data in Hiera's common.yaml file. Below is my sssd.conf file. [sssd] config_file_version = 2 services = nss, pam domains = default [nss] filter_groups = root filter_users = root reconnection_retries = 3 entry_cache_timeout = 300 entry_cache_nowait_percentage = 75 [pam] [domain/default] auth_provider = ldap ldap_id_use_start_tls = True chpass_provider = ldap cache_credentials = True ldap_search_base = dc=ederp,dc=com id_provider = ldap ldap_uri = ldaps://lvldap1.lvs01.ederp.com/ ldaps://lvldap2.lvs01.ederp.com/ ldap_tls_cacertdir = /etc/openldap/cacerts What is the best, most economical way to build the sssd.conf file? Should I have multiple .pp files such as domain.pp, pam.pp etc. or should all the lines of configuration land in init.pp?

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• When using TCP load balancing with HAProxy, does all outbound traffic flow through the LB?

  - by user122875

  I am setting up an app to be hosted using VMs(probably amazon, but that is not set in stone) which will require both HTTP load balancing and load balancing a large number(50k or so if possible) of persistant TCP connections. The amount of data is not all that high, but updates are frequent. Right now I am evaluating load balancers and am a bit confused about the architecture of HAProxy. If I use HAProxy to balance the TCP connections, will all the resulting traffic have to flow through the load balancer? If so, would another solution(such as LVS or even nginx_tcp_proxy_module) be a better fit?

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• Ubuntu 11.04 and OpenLDAP - where is the config?

  - by Tom SKelley

  I've been asked to setup a multimaster LDAP environment on Ubuntu 11.04 - instead of a single master server. I cloned the master server and recreated it into two VMs. I am trying to follow the instructions on the OpenLDAP documentation here: http://www.openldap.org/doc/admin24/replication.html and it talks about modifying the cn=config tree within LDAP. The subdirectory tree appears to be there at: /etc/ldap/slapd.d/ and a slapcat -b cn=config drops out a load of config information. When I try to connect using a browser and the admin bind credentials: ldapsearch -D '<adminDN>' -w <password> -b 'cn=config' I get: # extended LDIF # # LDAPv3 # base <> (default) with scope subtree # filter: (objectclass=*) # requesting: ALL # # search result search: 2 result: 32 No such object I don't see the config context when I connect via an LDAP browser either. I'm sure I'm missing something, but I can't see what it is!

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• Using the same VPC image on multiple workstations

  - by justSteve

  I haven't used an VMs before so brand new to the party. I'm running Win7 off an honest to goodness MSDN license so OS licensing is not an issue. I'd like to think that I could create a VPC image on a USB/eSATA hard drive and move that drive from one Win7-based workstation/laptop to another and I'd have the same services/desktop/computing environment at all of them. I'm a developer working against the IIS7/SQL08 stack with VS10 so i'm working with apps and services as deeply embedded with the OS as you can get. Should I expect to be able to pull this off? thx

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• Minimum space required for Server 2008 R1 install?

  - by Chris J

  I'm trying to plan disk space for a virtual environment, and wanting to keep virtual disks as small as possible - mostly as apart from the base OS, the software going onto the VM is less than a few MB, so want to avoid physical disk space going to waste; plus it'll give me an idea of how many VMs I could physically fit in {x}GB of physical drive. For Server 2003, I've had installs on 2GB and 5GB sized virtual disks. However for Server 2008, Microsoft recommends a minimum of 10GB (I assume this is both for x32 and x64). For the record, I will be installing the x32 version. Now I know I could just go ahead and try a small install, but wanted to solicit any practical knowledge as well :-) What's the smallest install of Server 2008 possible? (excluding server core installations).

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• Virtualizing OpenSolaris with physical disks

  - by Fionna Davids

  I currently have a OpenSolaris installation with a ~1Tb RaidZ volume made up of 3 500Gb hard drives. This is on commodity hardware (ASUS NVIDIA based board on Intel Core 2). I'm wondering whether anyone knows if XenServer or Oracle VM can be used to install 2009.06 and get given physical access to the three SATA drives so that I can continue to use the zpool and be able to use the Xen bits for other areas. I'm thinking of installing the JeOS version of OpenSolaris, have it manage just my ZFS volume and some other stuff for work(4GB), then have a Windows(2GB) and Linux(1GB) VM (theres 8Gb RAM on that box) virtualised for testing things. Currently I am using VirtualBox installed on OpenSolaris for the Windows and Linux testing but wondered if the above was a better alternative. Essentially, 3 Disks - OpenSolaris Guest VM, it loads the zpool and offers it to the other VMs via CIFS.

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• Shared FC LVM VG with LVs for each KVM VM. Clvm required?

  - by Cocoabean

  I have 2 virtual machine hosts running Ubuntu 12.04 and KVM managed with libvirt. They are both connected to the same VG which is a LUN on my SAN over FC. I provision LVs on this shared VG for each VM. I don't think I need HA or failover, but I do want live migration between the hosts. Do I need clvm in this case? As long as I don't try to start the same VM on each host should this work? Clvm requires lots of overhead with clustering tools that I don't think I need. I can deal with manually restarting VMs on other hosts in the event of a hardware failure.

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• How to make a DHCP server on virtual machine serves other virtual machines(on different physical machines)?

  - by Tony

  I'm building a virtual cluster with VirtualBox and Opensuse. I have 10 physical machines and need several vms on each. The virtual machines are supposed to be in a "private" network, but still have internet access. I was asked to set up a virtual head node working as DHCP server. I installed DHCP server on the virtual head node and it seems works. On VirtualBox I set 2 network adapters to the head node, one bridged adapter and one internal network. One vm on the same physical machine has been set nic as internal network adapter. The vm can get IP address (so DHCP works) but can't access internet. What should I do? Specifically, what network adapter should I choose for head-node and work-nodes in VirtualBox? What in the virtual machines should I do?

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• KeepLevelReg settings to eliminate sync prompts - errors occurred while Windows was synchronizing your data

  - by Detritus Maximus

  We have 2 XP pro VMs (Citrix) that both have problems with logout prompts appearing during logout. Users are closing the rdc before these appear: The Microsoft solution involves the creation of the KeepProgressLevel registry entry along with a value of 1 for "pause on errors." I have implemented this across the domain for this problem, yet these 2 VM's continue to have the prompts. Today, I experimented by changing the KeepProgressLevel option to 0. This is not one of the options given by MS, yet I stopped getting the prompts. Can anyone tell me what I've done by setting the value to 0? Have I basically turned off the feature as if the KeepProgressLevel entry is gone? If so, why no more prompts? I did notice during logoff that there is a red x and error message, yet no prompt.

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• Installing Domain Controller on Hyper-V Host

  - by MichaelGG

  Given a resource limited setup consisting of 2 host machines (HyperV-01 and HyperV-02), is it OK to put the domain controllers in parent partition, instead of their own VM? The main reason is that if the DCs go into a child partition, starting from cold on both machines could lead to a bit of an issue, as there'd be no DCs around until well after both parents have booted. I'm guessing this might cause undesirable effects. Am I correct to be worried about joining the host systems to a domain that's only on VMs? The biggest drawback I've heard so far is that if AD gets heavily used, its resources could cut into HyperV's. I'm not concerned about that for this deployment. Any other suggestions? (Besides finding a 3rd machine and running AD on it.)

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• Hyper-v error starting vm after reboot

  - by mamu

  Hi rebooted hyper-v host running server 2008 r2. After reboot one of my vm is throwing following error. 'The version does not support this version of file format' Out of my all vms this was only set to save state when shutdown. I tried deleting state and start still same error. Tried inspect disk as well edit disk both throw same error when try to open this. What could it be? any way to resolve it?

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