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• How to authorize standard users to install drivers

  - by Dr I

  I'm currently looking for a way to autorize my non administrators users to perform an installation of drivers. Here is the speech: All my users are standard users, they got a VirtualBox Hypervisor if they need the administrator rights. But if they put an USB device on the local machine and try to redirect the device to the Virtual Machine, Windows ask for some Administrator rights. I've try to set up those GPO: -Allow standard users to install drivers. -Install WHQL Drivers: Allow Silently. I don't know how to do this.

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• Best practice for ONLY allowing MySQL access to a server?

  - by Calvin Froedge

  Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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• Prevalence of WMI enabled in real Windows Server networks

  - by TripleAntigen

  Hi I would like to get opinions from systems administrators, on how common it is that WMI functionality is actually enabled in corporate networks. I am writing an enterprise network application that could benefit from the features of WMI, but I noted after creating a virtual network based on Server 2008 R2, that WMI seems to be disabled by default. Do systems admins in practical corporate networks enable WMI? Or is it usually disabled for security purposes? What is it used for if it is enabled? Thanks for any advice! MORE INFO: I should have said, I really need to be able to query the workstations but I understand that by default the WMI ports on Win7 and XP firewalls (at least) are disallowed, so do you use some sort of group policy or other method to leave a hole open for WMI on the workstations? Or is just the servers that are of interest? Thanks for the responses!!

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• Best way to deploy my node.js app on a Varnish/Nginx server

  - by Saif Bechan

  I am about to deploy a brand new node.js application, and I need some help setting this up. The way my setup is right now is as follows. I have Varnish running on external_ip:80 I have Nginx behind running on internal_ip:80 Both are listening on port 80, one internal port, one external. NOTE: the node.js app runs on WebSockets Now I have the my new node.js application that will listen on port 8080. Can I have varnish set up that it is in front of both nginx and node.js. Varnish has to proxy the websocket to port 8080, but then the static files such as css, js, etc has to go trough port 80 to nignx. Nginx does not support websockets out of the box, else I would so a setup like: varnish - nignx - node.js

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• Restoring files from blueprint on command

  - by Nick

  I am setting up a server. I already have rented a machine running centOS 6 but I have run into a bit of a technical problem with configuring the server software: The server will have some files that it will try to read/write to them but what I need is a way to have a blueprint of these files and everytime the server restarts the files that it used get deleted and replaced by the blueprints. I have heared of a RAM disks or Virtual File Systems but didnt quite understand how they work or how to set them up. The server software is written in java which means bash commands can be run from it. I cannot modify what happens when the server shuts down entirely what I can do is run a command before the server runs the final shutdown save

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• What are steps to upgrade an cisco UCS B series system vmware vsphere from 4.1 to 5.0

  - by Gk.

  I have a Cisco UCS B-series system with 1.4 firmware running vsphere 4.1 (ESX) + Nexus 1000V. I want upgrade all that stuff to vsphere 5.0 without downtime. I tried to find any documentation describe all steps needed to do it, but cannot found anything clear. Here is my plan: Upgrade firmware of UCS from 1.4 to 2.0. Doc: http://www.cisco.com/en/US/docs/unified_computing/ucs/sw/upgrading/from1.4/to2.0/b_UpgradingCiscoUCSFrom1.4To2.0.html Upgrade all vcenter, hosts+VEM, virtual machines, datastores using VMWare best practice. Is it OK? Am I missing something? Thank you, giobuon.

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• vi visual mode doesn't work

  - by BobMarley

  I'm running vim (7.0.237) after sshing to a remote CentOS box, and it just won't enter visual mode. When I press 'v', it just beeps and does nothing. I'm running Ubuntu with GNOME Terminal, and the local copy of vi works fine, so I don't see how this could be a problem with the terminal. I have the same .vimrc file on the local and remote machines, and the only settings are: set nocompatible; set tabstop=4. I'm at a total loss here, any ideas?

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• <authentication mode=“Windows”/>

  - by kareemsaad

  I had this error when I browse new web site that site sub from sub http://sharp.elarabygroup.com/ha/deault.aspx ha is new my web site Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS. Source Error: Line 61: ASP.NET to identify an incoming user. Line 62: -- Line 63: Line 64: section enables configuration Line 65: of what to do if/when an unhandled error occurs I note other web site as sub from sub hadn't web.config is that realted with web.config and all subs and domain has one web.config

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• How much power supply do I need for my server, and could a shortage be causing my odd crashing?

  - by dolan

  I have 5 servers, all with similar hardware (i7, four 2tb 7200rpm drives, two 4tb 5400rpm drives, 430 watt power supply), and lately the machines have been freezing up. This has gotten worse in the last day or so, and I can't pinpoint any explanation. One recent change was adding the two 4tb hard drives. The crashes happen most often while running a large Hadoop job, so I was originally thinking the load was causing some issues, but last night one server just froze without any heavy load on the box (or so I think), other than HDFS (Hadoop's distributed file system) was probably rebalancing itself since two of the five nodes were offline. If I plugin a monitor and keyboard to one of these frozen machines, I can't get any response or feedback on the screen. Any ideas on possible points of failure and/or different logs I can look at to investigate? Thanks Edit: The systems are running Ubuntu 10.04 Edit 2: More on hardware: intel core i7-930 bloomfield 2.8ghz processor (quad core) 12gb (6 x 2gb) kingston ddr3 1333 ram antec earthwatts green 430 power supply msi x58m lga 1366 motherboard

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• Chromium OS Lime installation confusion

  - by Abhinav Kulshreshtha

  I Used to download Chromium Vanilla build Virtual-box image from hexxeh. recently i wanted to try Lime build which only gives a .img file. I used the mentioned Windows Image Writer (link given on the lime website.) and a 8GB Transcend Website. When i tried to boot from pen-drive, the screen only flashed and nothing happened. Now when i tried to access my pendrive, it shows only 0.99 gb capacity. What happened wrong. How can i recover my pendrive. I tried to create vdi using VBoxManage.exe convertdd chromiumos.img chromiumos.vdi command given in This link. But it is not running on VBox either.

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• configuring nginx as reverse proxy

  - by user55714

  This isn't directly passenger related..but I am hoping some of you might have tried this for sure so why not ask. I am using passenger with nginx to serve my rails app on a virtual slice host. I am considering putting a reverse proxy for serving static content as well as handling etagged actions. 1 - Can I use my existing nginx installation and just change it to a reverse proxy? Do I even need a web server? What would a typical architecture look like in this case? nginx rev-proxy - nginx web server - passenger? or nginx rev-proxy - passenger? 2 - Is nginx the best choice in this case? 3 - Can my reverse proxy reside on the same slice? Thanks

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• Node.js apps and wordpress on the same vps

  - by Msencenb

  So currently my linode (ubuntu 11.10) serves up three node.js apps for me using connect's vhost middleware listening on port 80. Here is an example of how vhost sets up a domain: var portfolio = require('./bootstrap-portfolio/lib/app.js'); var server = express(); server.use(express.vhost('sencedev.com',portfolio)); server.use(express.vhost('www.sencedev.com',portfolio)); server.listen(80); However I would now like to add a wordpress installation to my vps as well. In the past for me this has meant a traditional apache installation; however I'm a bit unsure of how node.js + a different webserver (apache or nginx) should interact. Any thoughts on how I should approach hosting wordpress + node.js on the same box?

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• How full is too full for mechanical hard drives?

  - by Sunny Molini

  I have heard many claim that it doesn't matter how full a drive is until it starts cutting into temp and virtual memory space. This doesn't make sense to me, given the nature of how the data is transacted on a hard drive. The inside of the platter presents less data per revolution than the outside of the drive does, by significant factors. The inside 40% of the radius of full size hard drive is used for the spindle, so only the outside 60% is used for data storage, but that still means that the inside track of a hard drive presents data 60% slower than the outside track. By my calculation, a Hard drive that is only 10% full should perform about 2.25 times faster than a hard drive that is 90% full, assuming that the flow is constrained by other factors. Am I wildly off base here? For all the drives I know, even the top speeds of the first 1% of the drive would be well within the bandwidth provided by a SATA 2 connection.

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• How to issue machine certificates to Android devices trying to connect to L2TP VPN (L2TP/IPsec with Certificate)?

  - by John Hendrix

  I are trying to find a way to connect Android devices to our VPN box running Windows Sever 2008. We manage to configure a couple Android devices to connect via PPTP. However, I would like to be able to connect using L2TP/IPSec with certificates instead. I've managed to export and apply the Enterprise CA's certificate on the Android phone, but are totally lost on how to issue a machine certificate to the Android phone. Is it even possible? If so, what are steps I should take to issue the machine certificate and enable the Android phone to connect via L2TP/IPsec with certificates? Thank you for your help!

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• Rolling desktop recorder?

  - by lance

  I want a piece of software that will constantly record what I'm doing on my desktop, discarding footage that's over [30] seconds old. Its recording would be a rolling one. The idea is that I can somehow hit a button and see "what just happened". I don't want to have to babysit it. That is, I don't want a piece of software designed for screencasting (which I'm not trying to do). My bias against that is based on my (maybe incorrect?) assumption that I'd regularly have to start/stop the recording throughout the day. The idea is that this piece of software would consume fewer resources (than a screencast recorder) on my box, as it's only keeping a very limited amount of footage in memory (and low quality would even be acceptable), because it's discarding frames fairly quickly after they're captured. Where can I find a piece of software with features like this?

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• Need advice on how to set up live video streaming to web/mobile devices

  - by jasondewitt

  I have a bunch of live udp video streams that currently are viewed by set top boxes in my network. I would like to pick this video up (I can do this with vlc now) and stream it out to other non-STB endpoints (webpage or a phone/tablet of some sort). Right now I am able to pick up the udp stream with vlc and convert it to an http stream on port 8080 of my vlc box. Then I can use the vlc client to pick up and watch that video stream. This is where I'm not sure where to go with it. I really doubt I would want everyone who is watching the video to make a connection back to my vlc server that is doing the encoding, so how do I distribute this live video to the people who want to see it?

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• Does changing web hosts (changing a domain's nameservers) affect the private nameservers / glue records created under that domain?

  - by Kris

  We currently have a virtual dedicated server with GoDaddy and have 4 domains under it. I ended up creating private nameservers under, say mydomain_a.com, and have ns1.mydomain_a.com and ns2.mydomain_a.com as the nameservers for the other 3 domains. Now, we're thinking of switching web hosts (not domain registrar just the host) which means I have to change mydomain_a.com's nameservers to the new host. Will that affect or mess with the other 3 domains still pointing to ns1.mydomain_a.com and ns2.mydomain_a.com? Will that affect the private nameservers / glue records in anyway? Currently: domain: mydomain_a.com nameservers (GoDaddy): ns1.mydomain_a.com ns2.mydomain_a.com domain: mydomain_b.com nameservers (GoDaddy): ns1.mydomain_a.com ns2.mydomain_a.com After the Change: domain: mydomain_a.com nameservers (Other Host): ns1.some_other_host_ns.com ns2.some_other_host_ns.com This is my Question, Would this be affected? domain: mydomain_b.com nameservers (GoDaddy): ns1.mydomain_a.com ns2.mydomain_a.com

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• Create a VHD from a physical XP machine

  - by runxc1

  I am looking at upgrading from Windows XP to Windows7. I have a lot of development programs that would take 2-3 days to set-up configure etc. etc. when I get my new machine. What I want to do is create a VHD of my physical XP machine install Windows 7 and then operate out of my Virtual PC while I take the time to configure Windows 7. Is this possible to do? If so how do you do it?

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• What is the value/cost of enabling "spread spectrum clocking" on my hard drives?

  - by Stu Thompson

  I'm building up a biggish NAS box (10x WD RE4 2TB SATA RAID10) and ran into some problems. During the course of my research, debugging, investigations, etc, I discovered a jumper on the physical drives labeled "spread spectrum clocking". After some googling about this on teh internets, it seems to be a feature that some suggest (without reference or explanation) enabling in 'a storage configuration' that makes the drive less sussesptable to EMI. But why? I've got three core questions: Why is this feature not enabled by default? What are the actual benefits? Are there any costs?

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• user profile cannot be loaded in Windows 7

  - by alex

  so I wake up this morning and my mother drops the Dell laptop. She starts it up and no desktop icons appear. I take a look (mind you I'm not totally awake yet), go to start menu, click a button (I forgot which one) and a window box pops up saying something a bout the hardrive (I think it might have said cannot be located) she's crying right now and waiting until 10 to take it to bestbuy. she wont let me touch the dell either. could this be because of the drop or from torrents (which never was a problem)? please help.

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• Determine process using a port, without sudo

  - by pat

  I'd like to find out which process (in particular, the process id) is using a given port. The one catch is, I don't want to use sudo, nor am I logged in as root. The processes I want this to work for are run by the same user that I want to find the process id - so I would have thought this was simple. Both lsof and netstat won't tell me the process id unless I run them using sudo - they will tell me that the port is being used though. As some extra context - I have various apps all connecting via SSH to a server I manage, and creating reverse port forwards. Once those are set up, my server does some processing using the forwarded port, and then the connection can be killed. If I can map specific ports (each app has their own) to processes, this is a simple script. Any suggestions? This is on an Ubuntu box, by the way - but I'm guessing any solution will be standard across most Linux distros.

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• VPN ipsec tunnel from router to single windows server computer (gateway-to-host)

  - by Chris Miller

  Firstly, is this possible? The situation: 2 different ISP's. One has several servers and a firewall running. The other is limited to only one virtual server with one network card running windows server 2008r2. I need to set up a site-to-site style VPN using IPsec between the firewall of one ISP and the windows host on the other (gateway-to-host). This host has to run a SQL-Server that I can access from the other ISP's servers through the VPN tunnel. It seems looking at the RFC for IPsec that this should be possible using the features of Windows 2008, but I can't get it to work so far... It seems that I can't access any services running on the same computer or IP address used as the tunnel endpoint? Thanks Chris

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• What is the best way to back up dedicated web server? (Amanda versus Rsync)

  - by Scott

  Hello everyone, I am trying to establish valid back ups for my web server. It is a linux box on CentOS. I have asked around and "rsync" was suggested by some of the server fault community. However, my coworker at work says that this is really only moving over the physical files and isn't really a usable "snapshot." He suggested using "amanda" and that this did full server snapshots that are more what I am accustomed to. I know at my company we have virtual machines that we take snapshots of and we can restore everything back to just as they were with little effort and little downtime. Is this possible with rsync? Or would I need to create a new server and then migrate the files back and do various configurations? I think I prefer being able to just reset everything to a point in time. Forgive my ignorance, Back ups are something that I have never really had to worry about before.

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• Encrypt temporary password using public ssh key

  - by David M. Syzdek

  I manage a virtual office and our staff uses both SSH keys and passwords for authentication. If one of our staff forgets his password, is there a way to encrypt a temporary password using his public RSA ssh key so I can send it to him via e-mail? I've seen other questions related to this one, however the "answers" generally recommend against using the public/private SSH keys to perform general encryption/decryption and do not actually state if this is possible. I would like to know if it is indeed possible and what are the steps to encrypt and then decrypt the password.

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• Will my RAID0 stay intact when I move it to a new computer?

  - by Jeremy H

  My primary drive is a 250GB WD SATA drive. So, I added 2x 500GB 7,200 RPM WD SATA drives into my Windows Vista box and created a 1TB RAID0. I then formatted the the primary drive and installed Windows 7. To my pleasant surprise when I booted into Windows 7 my RAID0 was still intact and I kept trotting along the same as I did before. Now I am replacing my motherboard, processor, and RAM and plan on formatting the primary 250GB drive again and using it to boot for a new clean install of Windows 7. My question is: if I move these two SATA drives which are setup for RAID0 into the new system, install Windows 7 again, will the RAID0 remain? Edit: Software RAID. I created it within Windows. The RAID0 does NOT contain the system boot partition.

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