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• How do you manage updates without a staging environment: CentOS 6.3

  - by Gregg Leventhal

  I am managing about 20 servers, many of them virtual. They are almost all different purpose, and none are clustered. I have a distributed LAMP stack, a few application servers, some build servers, a few KVM hosts. They are CentOS 6.3 mostly with a few Ubuntu (unfortunately). I don't have the resources to setup a staging environment where I can have duplicates of my machines and test updates before rolling them out. I am taking file backups. What I want to know is how you are approaching backing up your Linux systems. I assume you don't just do yum update, but then how are you choosing the packages worthy of updating? When (if ever) are you updating the kernel, etc.. How do you test updates without a staging environment? Snapshot and hope for the best?

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• Events 1030 and 1006 in Windows 2003

  - by jab

  I've got a computer running Windows 2003 R2 Standard Edition Service Pack 2 and periodically (every 5 minutes) the systems generates 2 errors that can be seen in the event viewer. The codes of the events are 1030, 1006 that seems to be related to group policies... I don´t know if these events are realted to the perfomance of the system but anyway i would like to fix them. I've googled around and seems to be a common problem but i haven't found a solution for these events. Do you know how can be fix it? Thanks in advance

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• Slow Web Performance on two Windows 2008 R2 Terminal Servers

  - by Frank Owen

  We have two Windows 2008 R2 servers that we use for agents to log into to access our customers systems. Saturday morning we received complaints that on both servers the web is running horribly slow. This happens on all websites and the majority of the time the web site times out trying to load. Other users located at the same site but using their desktop machine do not see any issue. We have rebooted the boxes and checked settings and cannot find the cause. The CPU/Memory/Network/Disk Space use on the server is very low. I thought it might have been a MS update causing the issue but it appears the last update was applied in January. We have rebooted both boxes and I am in process of trying a different browser. Any ideas what could be causing this?

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• Apply Group Policy to Remote Desktop Services users but not when they log on to their local system

  - by Kevin Murray

  Running Windows Server 2008 Service Pack 2 with Remote Desktop Services role. I want to hide the servers drives using a GPO, but not the users local drives when they are logged on to their local system. Using a GPO, I went to "User Configuration - Policies - Administrative Template - Windows Components - Windows Explorer" and enabled "Hide these specified drives in My Computer" and "Prevent access to drives from My Computer" and in both used "Restrict all drives". Then under "Security Filtering" for the GPO, I restricted it to the system running Remote Desktop Services and the specific users who will be using RDS. I then applied the GPO to our domain and it worked a little too well. Not only was I successful in getting the GPO to work for RDS users, but it also affected those same users at their local systems as well. I've tried everything I can think of, but can't figure out how to apply this just to the RDS but not at their local system. What am I missing?

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• qmail questions - whitelisting and relays

  - by Richard

  My new server runs qmail, which I've never used before. There is no inbound mail on the server (all the clients have mail hosted elsewhere, but some systems on the server send mail. I'm about to move a client there who has several parked domains, and looking at the smtp log, the server is already blocking many attempts to relay spam using one of the parked domain names (probably because a related domain is already hosted there). How do I ensure those mails stay blocked, while allowing legitimate addresses to send out? Server OS is CentOS and hosting software is Kloxo.

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• Which tool / technology: System management for databases and dependent services

  - by Filburt

  I'm looking for advice on how to enable our team to take down and re-start our company systems for maintainance purposes. The scenario includes several Oracle db machines several MS SQL Server machines with multiple instances windows services (IIS etc.) BizTalk EAI solution Apache and Tomcat instances lots of scheduled tasks on win2003 and win2008 machines (physical and virtual). The main focus is on capture all dependencies between said databases and services and tasks connecting to them. At the moment an enterprise class solution is not an option. We are considering developing a solution driven by PowerShell scripts but I hope for some more suggestions.

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• Linux only recognizes 800Mhz from 2Ghz

  - by Leo

  I tried with Suse 11 (KDE), Xubuntu 11.10 and Lubuntu 11.10 and these systems only recognizes 800Mhz from my processor of 2Ghz! The utilities I used are: linuxinfo, sysinfo, "system profiler and benchmark". And all of this only shows 800Mhz My system specs are: AMD Turion 64 Mobile MK36 512 RAM nVidia Geforce Go 6150 (I also tried with nVidia restricted drivers) 120GB Hard drive The weirdest thing is that Windows XP and 7 recognize the 2Ghz of my processor, What can I do? p.s. (It is not just the value of 800Mhz, I also feel my system very slow with linux)

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• Office 2007 network share access denied

  - by Rodent43

  Hope I have not duplicated an issue already posted but I could not find anything from the search... Right here is the problem, we have recently updated all our desktops to the MS Office 2007 suite and people have issues trying to open simple files like word documents... the systems are Windows XP (SP3) Novell Network with novell client Office 2007 when they try to open a word document from a usual network share word presents a message reporting Access Denied Contact Administrator So we assumed network permissions, none of which have changed...so try the same file with Wordpad and it opens fine, be it with formating issues of course... Now copy the file to your desktop, which is not redirected, and you can open the file in word as normal... so does anyone know if office 2007 uses some new permission when opening files? does it create temps or something... any pointers would be appreciated

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• Squid - Selective reverse proxy and forward proxy

  - by Dean Smith

  I'd like to setup a squid instance to do selective reverse proxy for a configured list of URLs whilst acting as a normal forward proxy for everything else. We are building new infrastructure, parallel live as it where, and I want to have a proxy that people can use that will force selective traffic into the new platform whilst just acting as a forward proxy for anything else. This makes it very easy for people/systems to test the portions of the new platform we want without having to change too much, just use a proxy address. Is such a setup possible ?

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• Does anyone still use Iometer?

  - by Brian T Hannan

  "Iometer is an I/O subsystem measurement and characterization tool for single and clustered systems. It is used as a benchmark and troubleshooting tool and is easily configured to replicate the behaviour of many popular applications." link text Does anyone still use this tool? It seems helpful, but I'm not sure if it's for the thing I am trying to work on. I am trying create a benchmark computer performance test that can be run before and after a Windows Optimization program does its stuff (ex: PC Optimizer Pro or CCleaner). I want to be able to make a quick statement like CCleaner makes the computer run 50% faster or something along those lines. Are there any newer tools like this one?

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• 64 Bit Windows drivers for Inspiron 1720

  - by Rob Allen

  Dell doesn't seem to offer 64 bit drivers specifically for the Inspiron 1720 (laptop). I'm going to be upgrading from Vista 32-bit to Windows 7 64bit and I want to pull down the necessary stuff before hand. Are there any Dell systems that are similar enough to the Inspiron 1720 that I can use for a baseline to make sure I still have Ethernet and WiFi after the reinstall? It doesn't matter if they are for Vista 64 or Windows 7. Identified hardware: Processor: Intel mobile Core 2 Duo T7500 Chipset: Intel Mobile 965 Express Wifi: Intel Pro Wireless Drive Controller: Intel Matrix Graphics: nVidia GeForce 8600M GT Bluetooth: Dell TrueMobile 355 + EDR Ricoh card reader I think anything else, the default Windows drivers will be sufficient. Let me know if you think I missed something thing please.

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• How do I get detailed information about what happens during logon

  - by Funky Si

  Due to my IT department leaving I am now responsible for all our IT systems. I now have several problems to get my head around and fix. I run Active Directory on windows server 2003 and use group policy to apply settings etc. Recently we have had some windows 7 clients added to our network, these are having awful problems with our logon scripts and drive mappings. For the most part my XP clients are working without a problem. What I want to know is what is going on during logon, as running the logon scripts after I have logged on often works. Does anyone know of a way to get detailed log information of what is happening before and during logon. Thanks for your help and any suggestions you have for tracking down the source of these problems.

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• Security and encryption with OpenVPN

  - by Chris Tenet

  The UK government is trying to implement man-in-the-middle attack systems in order to capture header data in all packets. They are also equipping the "black boxes" they will use with technology to see encrypted data (see the Communications Data Bill). I use a VPN to increase my privacy. It uses OpenVPN, which in turn uses the OpenSSL libraries for encrypting data. Will the government be able to see all the data going through the VPN connection? Note: the VPN server is located in Sweden, if that makes a difference.

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• What happens when you add a Graphics card to a i7 with build in graphics (e.g. HD 4000)

  - by Matt

  I'm thinking of upgrading my computer from an AMD Phenom II X4 955BE with a AMD Radeon HD 6800 Graphics card (not integrated) to using a Intel Core i7 3770. As I have no knowledge of integrated graphics, my question is, what happens to the computing power when not using the HD4000 integrated graphics of the CPU (does it mean the CPU will run faster then it would if I relied on it?) Also what is better the CPUs inbuilt HD4000 or my Radeon Graphics card? I am mostly interested in terms of content creation: Using Adobe After Effects, 3D Rendering etc. Not too bothered about gaming performance. I will be using the spare parts of this build and older systems to make a second computer for network renders so what will be the advantages of keeping the Radeon with the current system for that?

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• windows 7 frequently crashes when running 64 bit debian on virtualbox

  - by erin c

  I've been having some hard times with Virtualbox. I use it to run 64-bit Debian guest on a Windows 7 host to be able to code for linux systems. It generally crashes when I build my code in eclipse cdt, or if I am doing some intensive operations. Should I lower the memory and core usage? Is this some sort of virtualbox problem? I upgraded to virtualbox v4.1.8 and the problem still occurs. My virtual machine instance uses 1736MB out of 4GB of ram, and I use 2 out of 8 processor cores. But still, the whole thing crashes 1 or 2 times every single day.

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• How to troubleshoot ping request time out

  - by user28317

  I have a Windows 7 and an XP machine connected to a NETGEAR wireless router. Both machines can log into the network and surf the web. Both are connecting wirelessly. I can ping the router from each machine and get a reply. I can ping each machine from the router and get a reply. But i cannot ping each machine from the other; getting a request time out. Subnet IP Addresses are 192.168.1.* Router =1; Win7 = 10; XP = 11; Firewall is currently off in both systems. Since i can ping from router im picking that not the problem anyway. If i try to ping from xp to win7 i get Request Timed Out. If i try to ping from Win7 to Xp i get destination host unreachable. What should i do now? Thanks

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• 1tera flop cluster?

  - by Adobe

  I want to buy a $40000 1 tera flop cluster to keep it in a room. What are the standard configurations? Cluster is supposed to do molecular dynamics simulations on biological systems. I'm proposed a 4 pc with 8 cores each by the selling company I'm deadling with. It looks like I also need infiniband. Does some one has an experience -- what phisical memory should I buy etc? I know things change very quickly... Still there might be a point or two to state. Edit: OS is supposed to be linux, application is gromacs.

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• Change Linux console screen blanking behavior

  - by quack quixote

  How do I change the screen blanking behavior on Linux virtual terminals? For example, if I switch to a VT from X, login, and leave the system alone for 5 minutes or so, the screen will blank like a screensaver. It comes back with any keypress, like a screensaver. Mostly I just want to change the timeout, but I'm also interested in other settings. If it helps, one of my systems is running Ubuntu 10.04 with the stock graphics drivers. fbset shows the console using the radeondrmfb framebuffer device.

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• Google Chrome gets really slow on 10+ open tabs

  - by Anton

  For some time already I face a problem with Google Chrome. I really love this browser, but on Windows 7 on a pretty decent machine (i5, 4GB RAM) it gets REALLY slow when I open for instance 10 techcrunch.com pages. Once I do that it becomes virtually difficult to scroll through pages and the general responsiveness of the browser gets down. And if I open 20+ or 30+ tabs there is a good chance all of them will crash. Does anyone got an idea? This happens to me on several PCs with Windows 7 64bit. At 10 tabs there is 600-700MB memory used by Chrome. Two systems have the issue are both laptops with integrated graphics. One by Intel, the other an nVidia GeForce 310M.

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• iptables: built-in INPUT chain in nat table?

  - by ughmandaem

  I have a Gentoo Linux system running linux 2.6.38-rc8. I also have a machine running Ubuntu with linux 2.6.35-27. I also have a virtual machine running Debian Unstable with linux 2.6.37-2. On the Gentoo and Debian systems I have an INPUT chain built into my nat table in addition to PREROUTING, OUTPUT, and POSTROUTING. On Ubuntu, I only have PREROUTING, OUTPUT, and POSTROUTING. I am able to use this INPUT chain to use SNAT to modify the source of a packet that is destined to the local machine (imagine simulating an incoming spoofed IP to a local application or just to test a virtual host configuration). This is possible with 2 firewall rules on Gentoo and Debian but seemingly not so on Ubuntu. I looked around for documentation on changes to the SNAT target and the INPUT chain of the nat table and I couldn't find anything. Does anyone know if this is a configuration issue or is it something that was just added in more recent versions of linux?

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• rkhunter warns of inode change by no file modification date changes

  - by Nicholas Tolley Cottrell

  I have several systems running Centos 6 with rkhunter installed. I have a daily cron running rkhunter and reporting back via email. I very often get reports like: ---------------------- Start Rootkit Hunter Scan ---------------------- Warning: The file properties have changed: File: /sbin/fsck Current inode: 6029384 Stored inode: 6029326 Warning: The file properties have changed: File: /sbin/ip Current inode: 6029506 Stored inode: 6029343 Warning: The file properties have changed: File: /sbin/nologin Current inode: 6029443 Stored inode: 6029531 Warning: The file properties have changed: File: /bin/dmesg Current inode: 13369362 Stored inode: 13369366 From what I understand, rkhunter will usually report a changed hash and/or modification date on the scanned files to, so this leads me to think that there is no real change. My question: is there some other activity on the machine that could make the inode change (running ext4) or is this really yum making regular (~ once a week) changes to these files as part of normal security updates?

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• How do I remove/uninstall a corporate VPN?

  - by Metro Smurf

  I have a corporate VPN installed on one of my Windows XP systems that I'd like to completely uninstall. There are no programs listed in the add/remove programs dialog matching the corporate VPN name or similar. I can find the VPN being launched from here: C:\Documents and Settings\All Users\Application Data\Microsoft\Network\Connections\Cm\<Company Name> I can see the VPN connection under network connections: Name Type Device Name Connection Manager ------------------- Connection to <Company Name> Connection Manger WAM Miniport (PPTP) Do I just need to delete the connection from Network Connections? And delete the directory? Or?

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• Change Linux console screen blanking behavior

  - by quack quixote

  How do I change the screen blanking behavior on Linux virtual terminals? For example, if I switch to a VT from X, login, and leave the system alone for 5 minutes or so, the screen will blank like a screensaver. It comes back with any keypress, like a screensaver. Mostly I just want to change the timeout, but I'm also interested in other settings. If it helps, one of my systems is running Ubuntu 10.04 with the stock graphics drivers. fbset shows the console using the radeondrmfb framebuffer device.

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• Why not install Msvcr71.dll into system32?

  - by hillu

  While looking for an authoritative source for the missing Msvcr71.dll that is needed by a few old applications, I stumbled across the MSDN article Redistribution of the shared C runtime component in Visual C++. The advice given to developers is to drop the DLL into the application's directory instead of system32 since DLLs in this directory are considered before the system paths. What can/will go wrong if I (as an administrator, not a developer) decide to take the lazy path and install Msvcr71.dll (and Msvcp71.dll while I'm at it) into the system32 directory (of 32 bit Windows XP or Windows 7 systems) instead of putting a copy in each application's directory? Is there another good solution to provide the applications with the needed DLLs that doesn't involve copying stuff to the application directories?

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• Where to obtain openssl-devel for SunOS 5.10

  - by user35949

  So I am having an issue that I have seen other people have on many different systems. I have to build Subversion on a SunOS 5.10 box and have run into issues. I have the openssl source code installed and in the subversion-1.6.9 folder, I run the following: ./configure --with-ssl --with-libs=/opt/exp/lib/openssl/lib and receive the error: checking for library containing RSA_new... not found configure: error: could not find library containing RSA_new configure failed for neon I have also tried running the command without the "lib" on the end of the --with-libs path. I read online that I need the openssl-devel packages, but I have been unable to find them for SunOS 5.10, and they do not show up already installed on my system when running pkginfo. I have looked online including http://www.sunfreeware.com/ which I was told was a good SunOS software source. Any help you can provide would be welcomed. Thanks, Sean

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