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• How to make a vm scale when demand for resource increases

  - by Cray XT3

  i am having a server with 16 virtual core and 24G RAM,using Xen virtualization and ubuntu as dom0 Created 4 VMs (in para mode),each with different applications. CPU Load vary on each vm,somtimes first vm reaches nearly 100% CPU and others under 25% or even less. So is there a way in which vm can get cpu from other vms when they are not actually using it or utilization is under 25%.Same in the case of RAM also. I am not sure whether i am mentioning Cloud here. Initially i would like to give every vm a single VCPU,but can scale up to 8 or more by taking cpu from other vms if they are not using it. Is there any kind of tool that makes vm to scale its resources when demand increases. Is cloudstack and openstack designed for these kind of purpose or is that just a GUI to manage VMs.

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• if there are multiple kernel module can drive the same device, what is the rule to choose from them?

  - by Dyno Fu

  both pcnet32 and vmxnet can drive the device. $ lspci -k ... 02:01.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] (rev 10) Subsystem: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] Flags: bus master, medium devsel, latency 64, IRQ 19 I/O ports at 2000 [size=128] [virtual] Expansion ROM at dc400000 [disabled] [size=64K] Kernel driver in use: vmxnet Kernel modules: vmxnet, pcnet32 both kernel modules are loaded, $ lsmod | grep net pcnet32 32644 0 vmxnet 17696 0 mii 5212 1 pcnet32 as you see, kernel driver in use is vmxnet. is there any policy/algorithm in kernel how to choose from the candidates?

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• Cross-Forest Trust

  - by cdalley

  I am looking at testing a cross-domain trust we can have two domain controllers (with different forests and domain names) setup so we can move everyone onto the new domain. We do NOT run exchange on site and we do not have any links to O365 to AD currently. Onto the problem: I have setup two DCs in a Virtual Machine: They are on the same network 192.168.0.* The Windows 2003 server: Name: OLDSRVR "Clone" of our current Domain Controller IP: 192.168.0.1 Domain: internal.test.com The Windows 2012 server: Name: ADCTEST01 Brand new domain setup from scratch separate to internal.test.com Domain: internal.test2.com IP: 192.168.0.2 OLDSRVR can only see ADCTEST if it has dynamic IP set. If I set a static IP it cannot see it. If I try using the dynamic IP and try to join it gets to the end then complains "??The trust relationship between this workstation and the primary domain failed" Any ideas?

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• How to get Hyper-V to recognize that a VM isn't stopping, it's stopped.

  - by Matt Burke

  I have a Hyper-V virtual machine that has some problems. First, its settings are apparently corrupt: The WMI object contained an invalid value in property BIOSNumLock. The WMI object contained an invalid value in property AutomaticStartupAction. Second, I saw something that implied that I could toggle the NumLock checkbox on the BIOS property page to fix the first problem, but the checkbox didn't show up. So I connected to the VM and shut it down. Now (many hours later) Hyper-V claims that the VM is "Stopping". However, when I follow the interweb's directions on forcing a VM offline (i.e. find vmwp and kill it), I can't find vmwp. The VM's WMI object has a PID that doesn't exist, and none of the vmwp processes have this machine's GUID. So, how do I trick Hyper-V into seeing that the machine is offline (or letting me delete it)?

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• SQL Query fields change to uppercase on upload to server.

  - by Conor H

  Hi There, I have just finished developing an app using CodeIgniter. When I upload it to my Host (Hostgator shared) some of the SQL text is converted to uppercase and rendering the app unusable. In my database I have two tables client and transaction. When I upload the App to the server client and transaction is replaced with all caps. Obviously this is bad as MySQL queries are case sensitive. At first I was uploading with FTP and thought FTP was to blame. I then zipped up the app and uploaded the archive, unpacking it on the server shell. Still no joy. Any ideas on how to fix this? At the moment I just have to go into the server and edit my queries back to lowercase.. Cheers in advance for any ideas.. --Conor

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• Tuning OpenVZ Containers to work better with Java?

  - by Daniel

  I have a 8 GB RAM Server (Dedicated) and currently have KVM Virtual Machines running on there (successfully) however i'm considering moving to OpenVZ as KVM seems a bit overkill with a lot of overhead for what i use it for. In the past i have used OpenVZ Containers, hosted by myself and from other providers and Java doesn't seem to work well with them.. One example is that if i give a container 2 GB RAM ( No burst) (with or without vswap doesn't matter) a java instance can only be tuned to use at very most 1500 MB of that RAM (-Xmx, -Xms). Ideally, i wish to be able to create "Mini" containers with about 256MB, 512MB, 768 RAM and run some java instances in them. My question is: I'm trying to find an ideal way to tune a OpenVZ container configuration to work better with Java memory. Please, don't suggest anything related to Java settings, i'm looking for OpenVZ specific answers.. Though i welcome any suggestion if you feel it may help me. Much Appreciated, Daniel

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• Basic networking: Centos Server Router + Ubuntu Client setup.. unable to access outside world from client

  - by ale

  I am trying to set up my Centos Server with two NICs as a router. eth0 is connected to the outside world and eth1 is connected to an Ubuntu client. Here's eth0 on the server: DEVICE=eth0 BOOTPROTO=dhcp ONBOOT=yes TYPE=Ethernet eth1 on the server: DEVICE=eth1 BOOTPROTO=static IPADDR=192.168.0.10 # a free address on my network ONBOOT=yes TYPE=Ethernet My server has IPv4 packet forwarding turned on and my iptables only contains: # iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE # iptables --append FORWARD --in-interface eth1 -j ACCEPT My Ubuntu client has this in its /etc/network/interfaces auto lo iface lo inet loopback iface eth0 inet dhcp gateway 192.168.0.10 but I can't get an Internet connection from the server for my client. I can't even ping my server from the client: $ ping 192.168.0.10 Destination Host Unreachable

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• Can't access LAN computers with SSH

  - by endolith

  I got a new Windows 7 machine, and was using VNC,SSH etc to connect to my Ubuntu machine, and it worked fine previously. Now it doesn't work if I use the machine's hostname or local IP, but if I use the DynDNS name, it works. I can also access it from my Android phone using the local hostname over SSH. If I try to connect with SSH to the hostname, it says "Host does not exist". VNC says "Failed to get server address". NX says "no address associated with name", and I don't see it in Windows' "Network" folder. I've rebooted everything. I've turned off Windows firewall. It was working fine a few days ago, but now it's not. How do I figure out what's blocking it?

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• my domain.com is pointing to two different IP addresses

  - by user43726

  Initially my domain , mycompany.com points to this IP: - 123.456.789.101 (sample only) Then i got another VPS and then decided to move the mycompany.com into this new IP/Host: - 987-654-123.123 (sample only) I changed the necessary stuff like DNS, etc. from my domain management panel. But when i ping it : ping mycompany.com , sometimes it gives the first IP, sometimes the second one. Also when i visit the url from the browser, sometimes it loads, sometimes it doesn't. How can i solve this? Please help. Thanks

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• rdesktop + seamlessrdp + virtualbox slow on Windows

  - by Claudiu

  I'm trying to get VirtualBox seamless mode to work on all of my monitors at once. I was directed to this link, so I followed the instructions, using the windows port of rdesktop 1.6 found here, and using Xming as an X server. I eventually finally got it to work! However, it's really slow. While VirtualBox's regular seamless mode is as performant as if I was running apps on my host machine, with rdesktop it takes 1-2 seconds to register any user input. Dragging windows around is laggy and buggy (pieces of the desktop behind the window show through). I'm simply connecting to localhost, so network bandwidth/latency shouldn't be an issue... anyone have any idea why it's so slow and what I can do to make it more performant?

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• Cannot connect to telnet server

  - by BloodPhilia

  So, I can't use telnet to connect to any server but it works fine from a different computer. It just says it can't connect. I tried the following things: Disable firewall and AV protection. (Basically, there was no security feature left online) Telnet is set to "Trusted" in my AV protection. (Kaspersky Internet Security 2011) Using Putty to telnet, but apparently Putty's connection is also inhibited. (Says it can't connect to host) Disabling the telnet client in Control Panel and then re-enabling it. (Windows 7 Ultimate) hosts file is clean. Checked for nasties using MBAM and KIS 2011 as well as going though my HijackThis logs, nothing found. I can connect to the same machines/servers through the web browser, ping, tracert, etc. Only telnet seems to be blocked. Any other thoughts?

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• Vmware Workstation Development Server on Laptop

  - by Koobz

  I'm running an Ubuntu guest OS on my Windows 7 laptop. Currently, I have it set up for bridged networking. The guest is os is configured for a static ip of 192.168.1.115, which depending on the network I'm connected to, may not be available. When I want to view my development work I hit that up in my web browser. I'm really looking for the following scenario: 1) My guest OS ip address stays constant. 2) I can access my guest os even if I don't have an internet connection, or a lan/router. 3) I can share files with my guest/host. How does one accomplish this using VMware Workstation?

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• Problems executing check_mysql plugin

  - by Brian

  I'm attempting to test out the check_mysql plugin for Nagios using the command line. It works great when I'm just checking localhost but when I try to specify a different server (using the -H argument) I keep getting the following error message: CRITICAL - Unable to connect to mysql://nagios_user@{remoteServerHostname}/ - Access denied for user 'nagios_user'@'{localServerHostName}' (using password: YES) It looks like it's trying to connect to the database using the localhost server even though I've specified a different host name. I've already set up this user on the remote database and they have correct permissions. I'm just trying to figure out why the script keeps inserting the localhost server name instead of the remote one.

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• Linux IPv6: DHCP and /127 prefixes

  - by Jeff Ferland

  I've tried multiple pieces of DHCP client and software in attempting to setup a solution for allocating a /127 prefix to virtual machines so that each maintains its own layer 2 isolation. Because there would only be one host assigned to each network, a /64 is impractical. While the prefix size could reasonably be somewhere in the /64-127 range, the crux of the problem has been the same regardless of the software used in configuring: the DHCP call to bring up the interface uses the address advertised by DHCPv6 and inserts two routes: the /127 given by the router advertising packets and a /64 as well. Any thoughts on why I'm getting the additional route added across dhcp client vendors?

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• Configure sendmail to accept connection from one other IP address

  - by Kumala

  I have a RubyOnRails application running on the same server that runs sendmail. The application sends out (no need to receive) emails via the local sendmail. Now I intend to move sendmail to a dedicated server. How do I make sendmail on that server accept connections from my application on the other server? I modified sendmail.mc from DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp, Addr=127.0.0.1')dnl to DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp')dnl I have also added to /etc/mail/access: Connect:198.211.117.41 RELAY then ran m4 sendmail.mc > sendmail.cf and restarted sendmail. Trying to connect from my app server with telnet on port 25 to the mail server gives me: telnet: Unable to connect to remote host: Connection refused Am I missing something?

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• Scripted printer configuration changes

  - by David Steven

  I've got about a dozen Windows XP machines that I need to make a couple specific printer configuration changes to. The printer is "virtual" printer for an electronic delivery service. I'd like to not have to visit each machine individually. I already have the means to execute commands remotely on the machines, I just can't seem to find away to adjust these settings via command line or script. Specifically I need to be able to make the following changes: 1) As an admin user: - Device Settings - Font Substitution Table/Courier New - Change to "Courier" 2) As a specific* user: - Printer Preferences - Paper/Quality - Advanced - Change Graphic/Print Quality to "600 x 600" - Change Document Options/Printer Features/Graphics Mode to "HP-GL/2" *This change is a per user configuration, unless there's some way to make it once. In this situation I only really need it for a specific (different) user on each machine.

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• Why is Nginx ignoring the access_log directive when post_action is specified?

  - by Chris

  Hi, in the location below nginx writes a custom download log. Everything works fine except when there is a post_action directive. I seems that nginx skips the access_log directive. Here is the config: location /download_intern/ { internal; if ($uri ~* ^/download_intern/([0-9]+)/) { set $transferID $1; set $server $arg_ip; set $url $arg_url; proxy_pass http://$server:80/$url; break; } log_format download '$remote_addr [$time_local] $upstream_cache_status "$scheme://$host$request_uri" $status [$transferID] $body_bytes_sent'; access_log /opt/nginx/logs/server.download_log download; # without this line the download log file is being written post_action /done; } location /done { internal; # log the transfer on the main server proxy_pass http://xxx.xxx.xxx.xxx:80/download_end/?tid=$transferID; }

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• Active node stops resources when pasive node is shutdown

  - by Wakaru44

  2 nodes, active/pasive. 2 resources, a virtual ip, openLdap, and the nfs mount where openldap saves the data. When both nodes are up, things worked fine. You could move resources away and put the active in stanby. But when i rebooted the passive node, ( with the resources in the active node), and the passive node loses conectivity, all the resources in the active where stopped by pacemaker. I'm reading the documentation right now, but I just need a little quick tip to figure what could be hapenning here. Im using: corosync pacemaker RHEL 6

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• Deleting pagefile.sys on shutdown

  - by Daniel E. Shub

  I have a Windows XP machine (it is a VM running in Xen) that I would like to backup. I have enabled ClearPageFileAtShutdown by following MS KB 314834. If I cleanly shutdown the XP machine and then mount the drive in another machine (which is trivial since the machine is virtual) I still have a large pagefile.sys. I was hoping that enabling ClearPageFileAtShutdown would result in a pagefile.sys with a size near zero. I have two questions. First, is it possible to have pagefile.sys be deleted, or have a drastic size reduction, at shutdown? Second, can I exclude pagefile.sys from my backup?

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• capture nimbuzz traffic

  - by lurscher

  I need to capture all the traffic, specially during login, between nimbuzz pc client and nimbuzz server. The reason is that i need to debug outgoing packets at login that mark the user visibility status in order to reproduce them in a in-house XMPP client application I've tried doing this with wireshark, but i seem to be pretty helpless with this tool. Also, the packets i've been able to see are all before the SASL negotiation happens, after that, i cannot see the xml packets being exchanged any help for how to achieve this task is greatly appreciated (preferably on Windows, since there is no nimbuzz client for linux, in any case i can install one in a VM and monitor the traffic between the VM instance in the linux host)

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• apache redirect to https for basic auth

  - by shreddd

  I have a tricky variation on an old problem. I have an apache based site that should generally be accessed via http/port 80. However for certain areas protected areas that require authentication (designated by .htaccess), I want to be able to redirect the user the https/port 443. The key here is that I want this to always happen - i.e. I don't want to have to rewrite each htaccess file with a redirect. I only want to enforce this for basic authentication and the protected areas are scattered all over the site. Is it possible to somehow redirect all basic authentication requests to the SSL host?

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• XAMPP Closes the Connection and won't let me download anything

  - by Miro Markarian

  I want my XAMPP Apache server to host a zip file (The file is around 250mb) but the server closes the connection and won't let me download the file! However webistes are loading correctly and It seems that the problem is with the extension Does xampp/apache have any file extension limit that they won't let me download .zip and .exe files? Also tested with a smaller .exe file , the problem is still present. It just doesn't let me download any file from the server.!!! Here is the file link to check: Test All I get in the error log is this: Fri Sep 07 23:21:31.742625 2012] [authz_core:debug] [pid 3664:tid 396] mod_authz_core.c(808): [client x.x.x.x:23409] AH01628: authorization result: granted (no directives), referer: http://ammiprox.tk/greeneyes2910/

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• [SOLVED] vmware problems - networking - no packet response

  - by jack

  XP is my host. Ubuntu is my Guest in VMware. When I do the following commands, I should get SMTP respones but now get no response. I use wireshark to analayze it. Also in wireshark shows nothing. root@vmware:~# netcat 192.168.1.2 25 220 762462a8c4d Microsoft ESMTP MAIL Service, Version: 6.0.2600.5949 ready at Fri, 12 May 2010 18:04:20 +0800 EHLO SAYHELLO VRFY TEST@LOCALHOST test \ sdfsafsd How can I fix it? UPDATE: I came to know that this is no VMWare problem. This is Netcat problem. For this, you might have to type Ctrl+M {ENTER} {ENTER}

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• Zabbix - Some of the monitored items dont get refreshd. how to find the reason?

  - by Niro

  I'm experiencing a strange issue with Zabbix monitoring a MySQL server. Most of the data from the server such as MySQL queries per second and MySQL uptime , Buffers memory etc. update nicely while some data like CPU iowait time (avg1) , Host local time ,MySQL number of threads and other items which were monitored in the past has last check time of about a week ago. I can't find any logic in this, for example Mysql number of threads and Mysql queries per second are obtained in a similar way so it does not make sense one of them is monitored and one is not. Please help- how can I fix this?

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• Locking down a server for shared internet hosting.

  - by Wil

  Basically I control several servers and I only host either static websites or scripts which I have designed, so I trust them up to a point. However, I have a few customers who want to start using scripts such as Wordpress or many others - and they want full control over their account. I have started to do the basics - like on php.ini, I have locked it down and restricted commands such as proc, however, there is obviously a lot more I can do. right now, using NTFS permissions, I am trying to lock down the server by running Application Pools and individual sites in their own user, however I feel like I am hitting brick walls... (My old question on Server Fault). At the moment, the only route I can think of is either to implement an off the shelf control panel - which will be expensive and quite frankly, over the top, or look at the Microsoft guide - which is really for an entire infrastructure, not for someone who just wants to lock down a few servers. Does anyone have any guides that can put me on the correct path?

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