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• Virtualized CPU cores vs. threads

  - by nedm

  We've got a KVM host system on Ubuntu 9.10 with a newer Quad-core Xeon CPU with hyperthreading. As detailed on Intel's product page, the processor has 4 cores but 8 threads. /proc/cpuinfo and htop both list 8 processors, though each one states 4 cores in cpuinfo. KVM/QEMU also reports 8 VCPUs available to assign to guests. My question is when I'm allocating VCPUs to VM guests, should I allocate per-core or per-thread? Since KVM/QEMU reports the server has 8 VCPUs to allocate, should I go ahead and set a guest to use 4 CPUs where I previously would have set it to use 2 (assuming 4 total VCPUs available)? I'd like to get the most possible out of the host hardware without over-allocating.

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• Apache gzip with chucked encoding

  - by hoodoos

  I'm expiriencing some problem with one of my data source services. As it says in HTTP response headers it's running on Apache-Coyote/1.1. Server gives responses with Transfer-Encoding: chunked, here sample response: HTTP/1.1 200 OK Server: Apache-Coyote/1.1 Content-Type: text/xml;charset=utf-8 Transfer-Encoding: chunked Date: Tue, 30 Mar 2010 06:13:52 GMT And problem is when I'm requesting server to send gzipped request it often sends not full response. I recieve response, see that last chunk recived, but then after ungzipping I see that response is partial. So my question is: is it common apache issue? maybe one of it's mod_deflate plugins or something? Ask questions if you need more info. Thanks.

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• What are the "must " security tools for small organizations ?

  - by Berkay

  One of my friend has started a company, it's a small-scale company that has a 40 workers.There is two guys also responsible for the security and IT related issues.He is managing the LAN, Webpage of the company, e-mail configuration, printer hardware modification, application deployment etc. In this point, to provide the security measures including access controls, authentication, web server security etc. Which tools do you use for securing, monitoring and controlling the system ? Are you paying for these tools or are they open source? This question is due to the security administrators requests to my friend.He offers to get some tools for the company and my friend hesitates to pay that much on them (what he mentioned me.)

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• Linux EC2 Instance Security Consideration

  - by Amzath

  I am going to host a web site in Amazon EC2 instance which would be a Linux instance. My web application will be developed using PHP, Apache and MySql. As I am new to Linux and Amazon EC2 environment, what are key areas in security should I consider to protect my server? This may be very very generic question as the security itself a vast area. But I need to kick start with most imporant points. That way I would be able to track down all those areas one by one.

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• Linux EC2 Instance Security Consideration

  - by Amzath

  I am going to host a web site in Amazon EC2 instance which would be a Linux instance. My web application will be developed using PHP, Apache and MySql. As I am new to Linux and Amazon EC2 environment, what are key areas in security should I consider to protect my server? This may be very very generic question as the security itself a vast area. But I need to kick start with most imporant points. That way I would be able to track down all those areas one by one.

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• Kerio group calendaring private/public functionality

  - by bsigrist

  We are considering a change of email servers and Kerio Connect is attractive. However, I am concerned about calendaring functionality. I found an old forum post that states the question well: "We want to create a single public calendar that everyone can see - using Windows XP/Outlook 2003/KOC 6.4.1. We want a way for people to put an entry in their own personal calendar and some how mark it so the entry auto add's or syncs with the public one. If an entry is private it wouldn't sync to the shared public calendar... Has anyone ever heard of a way to do this - in any way with any software?" This is a high priority feature, so if Kerio cannot do this, we may consider Exchange. Does Exchange provide functionality like that described?

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• verisign certificate into jboss server SSL

  - by rfders

  Hi all, i'm trying to enable jboss to uses ssl protocol using a previously generated certificate from verisign, i imported both certificate, server certificate and ca certificate into the keytore file, and i configured the server.xml to use that keystore and activate ssl protocol, then when i run the jboss, I got this error "certificate or key corresponds to the SSL cipher suites which are enabled" Question, reading some post on internet, i found that every example was made it generating a Certificate Request, it stricly necesary to do that if i already have the server certificate and that CSR has to be imported into the keystore as well ? at this point i'm very confused about this issue, i tried almost every solutions posted in several forums but till now i haven't any luck !! can you give me some tips in order to solve this problem. thanks in advance this are my keystore file: Keystore type: jks Keystore provider: SUN Your keystore contains 2 entries j2ee, Dec 29, 2009, trustedCertEntry, Certificate fingerprint (MD5): 69:CC:2D:2A:2D:EF:C4:DB:A2:26:35:57:06:29:7D:4C ugent, Dec 29, 2009, trustedCertEntry, Certificate fingerprint (MD5): AC:D8:0E:A2:7B:B7:2C:E7:00:DC:22:72:4A:5F:1E:92 and my server.xml configuration:

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• recover lost files from sd card(digital camera)

  - by user23950

  How do I recover lost data from sd card? I already tried using: Photorec Recuva Tune up undelete Pareto data recovery chkdsk x: /F from here: http://superuser.com/questions/128259/how-to-recover-images-from-memory-card But none of them worked. I think I've only lost the data yesterday. And I haven't used the camera. So there's a possibility that it is still there. But the question is how I can recover the images? I think its lost when I tried to connect the digicam with the computer. But the camera froze so I tried to remove the batteries then try again.

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• Installing Windows 7 on a BSOD Windows Vista (ASAP)

  - by anonymous

  On a previous question i posted, i asked for help on fixing my windows vista box because it keeps going to blue screen. No one seems to have the answer, so now i want to install Windows 7. I want to know if i can install 7 without having to reformat my hard drive and having to lose all my files. I've already confirmed the hardware is working because i installed Ubuntu 9.10 on my external hard drive and it runs on my system fine. I tested the memory using vista's memory test and Ubuntu's memory test. here's the previous post: http://superuser.com/questions/125897/i-really-need-help-resolving-a-window-vista-bsod-blue-screen-crash-on-my-deskto

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• Malicious Software

  - by Bb

  I had a program created for me recently and didn't really think about it being executable posing a threat since I pretty much trust the source but not completely. I then thought about the fact that a keylogger, or any kind of spyware or malicious software could've been possibly binded to it. This made me wonder about all the other stuff I download daily from places or people (torrents) I don't think twice about. My question is, how can someone find out if there has been some sort of keylogger binded to the software you're running or other things binded? What are some good ways to find out and stop these things?

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• What kind of server do I need to handle 10 million requests and mySQL queries a day?

  - by Calvin

  I'm a new bie of server administration and I'm looking for a powerful hosting service to host my new website. This website is basically a back-end of an mobile online game, and it will: handle up to 10 million of HTTPS request and mySQL queries a day store up to 2000 GB file on the hard disk transfer probably 5000 GB data in and out per month it runs on PHP and mySQL have 10 million records in mySQL database, for each record there are 5-10 fields, around 100 bytes each I really don't know what kind of a server I need to handle these requirements, my question is: what cpu/ram do I need for a dedicated server or vps? what hosting companies are able to offer this kind of dedicated server or VPS? what about cloud computing? I've researched Amazon EC2 but it seems complicated to me. And I've contacted Rackspace but strangely they said Cloudsites is not suitable for my requirements. I wonder if there is other cloud hosting company. any other alternative method? thanks very much!

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• Display won't come back from power saver mode

  - by tynor

  I wan't sure where exactly to post this question, but this one seemed the most relevant. I have a Dell LCD monitor running off a Dell Inspiron 531 tower with an Nvidia GeForce 8600 GT video card. Just recently, when I turn my computer on, the display immediately enters its "Power Saver" mode, and never wakes up. This problem doesn't occur with other computers, or even with this same computer when I use the integrated graphics. I have no other displays to test the card on. I have also tried replacing the power supply (my original one, which ran that video card for 4 years, was 300w, and I replaced it with 500w). Is there anything else I can try to troubleshoot this issue?

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• AMD chipset VS SLi

  - by djechelon

  Hello, I currently own a Crosshair 2 Formula which is broken and I need to replace. Recently, I bought a Phenom 2 CPU which I wouldn't like to throw away. Recent Crosshairs are based (as opposed to the Rampage series) on chipsets that are certified for AMD Crossfire. The problem is that I have 3 SLi cards I absolutely don't want to change with AMD card(s) since I use 3D Vision, and I need NVidia. If I buy a Crosshair 3 or 4 which is not SLi certified, will SLi still work? Else, could you suggest me a good gaming motherboard with AM3 socket and that works with 3-way SLi? Thank you in advance. [Edit] I'm asking this question because it seems Crosshair 2 is difficult to find among the market

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• Mac OS X bash: uninstall all apache and PHP occurences

  - by fireeyedboy

  Hi all, How do I find all installed apache and PHP occurences on a Mac OS X system in bash and uninstall them? My motivation: I've managed to install multiple apache and PHP packages (I believe it's called packages in Unix terms, correct?) at some point, and I'ld like to start out fresh again, without completely re-installing Mac OS X again. Also, I'ld like to install suPHP along with apache this time, and I believe I need to compile apache with some additional stuff for that. But that is a challenge I'll deal with later, and probably ask a question about then. :) Thank you in advance for your info.

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• Interview questions to ask employer for tech support role

  - by Kernel Panic

  Possible Wiki question. What questions should I ask a potential employer for a position as an intern in a tech support role? This is the first interview offer I have had after 18 months of unemployment. I don't have a background in tech support or sysadmining. What are some metrics a tech support person would want to know about the position. What questions would flesh out more of the job description, without making me look like the impostor I obviously am? Thank you kindly.

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• Windows: Running an AutoIt script to launch a GUI app - on a server, when no one is logged in

  - by mrled

  I want to run an AutoIt script every day at 1:00 AM on a Windows 2003 Server Standard Edition. Since this is a server, obviously there is rarely someone sitting there logged in at the console, so the procedure needs to account for this. The AutoIt script in question launches and sends keypresses to a GUI app, so the process needs to include creating some sort of session for the user running the schedule task. Is there a way to do this? I can't just use scheduled tasks run the AutoIt script when no one is logged in - if I do, it fails to launch at all. I thought that I might be able to create an RDP session and run the scheduled task as that user, inside that session, but I haven't found a way to create an RDP session without launching mstsc.exe -- which is itself a GUI app, and I have the same problem again.

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• Is it possible to rename an open Word document without closing it?

  - by RoboShop

  I just ask this question as I do not believe that after so many versions of Word, it wouldn't exist. Usually when I'm working on a document and I realize I have to rename it, I have to close the document down, go to file explorer and then rename it, and then opening it up again. It's a procedure that's so ingrained in my usage pattern that I didn't realize until now that I'm actually having to open and close multiple windows/ applications etc. simply to rename a file. Surely, it's the year 2012, I should be able to do a simple thing like that with a few clicks right? So is there a way to just rename the file name of a word /excel / office document without having to close it first?

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• IBM Bladecentre H Bootup Sequence Control

  - by Spence

  I have a bladecentre with blades, network and a SAN in a single rack. What I'd like to do is control the startup of the bladecentre so that when the rack is powered on that the blades will delay their bootup until the SAN is powered on correctly. Is this even possible? We have an AMM in the chassis if that helps. Basically we are looking into the reboot that occurs after power is restored to a UPS. I sincerely apologise for the noobness of this question, but I am a software guy trying to help :)

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• How low-power can a home server get?

  - by Halik

  I've got quite simple question actually. How green, low-power and efficient x86 home server can I build using consumer parts with rather constrained budget. After looking through some Google hits I've found out that system based on dual-core atom, some modest mITX board (gigabit lan, integrated audio and gfx etc), one RAM module and one 'green' WD HDD, powered by picoITX PSU uses about 30W at idle up to 40 at load. Can you get lower (or how much lower) then that? Maybe some VIA nano chips, or single core atom? My home server would take care of some back-upping mixed with little ftp/http traffic.

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• Security and Windows Login

  - by Mimisbrunnr

  I'm not entirely sure this is the right place for the is question but I cannot think of another so here goes. In order to login to the windows machines at my office one must press the almighty CTRL-ALT-DELETE command combo first. I, finding this very frustrating, decided to look into why and found claims from both my sys and Microsoft stating that it's a security feature and that "Because only windows could read the CTRL-ALT-DELETE it helped to ensure that an automated program cannot log in. Now I'm not a master of the windows operating system ( as I generally use *nix ) but I cannot believe that "Only windows can send that signal" bull. It just doesn't sit right. Is there a good reason for the CTRL-ALT-DELETE to login thing? is it something I'm missing? or is it another example of antiquated legacy security measures?

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• Windows 2008 R2: can't extend C drive, mystery partitions

  - by wfaulk

  I have a Windows 2008 R2 server running under VMware ESX 4.0.0. I have reallocated disk space to it in order to extend the C drive, but Disk Management has "Extend Volume" greyed out. DISKPART shows more partitions than Disk Management shows, including one after the volume I'm trying to extend, which would explain why Disk Management isn't allowing the extension. Disk Management shows: System Reserved / 100MB NTFS / Healthy (System) (C:) / 39.39 GB NTFS / Healthy (Boot, Page File, Crash Dump) 10.00 GB / Unallocated DISKPART shows: Partition 1 Dynamic Data 992 KB 31 KB Partition 2 Dynamic Data 100 MB 1024 KB Partition 3 Dynamic Data 39 GB 101 MB Partition 4 Dynamic Data 1024 KB 39 GB My question at this point is: what the heck are partitions 1 and 4, where did they come from, why doesn't Disk Management show them, and, most importantly, can I delete partition 4 in order to extend partition 3?

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• IBM Bladecentre H Bootup

  - by Spence

  I have a bladecentre with blades, network and a SAN in a single rack. What I'd like to do is control the startup of the bladecentre so that when the rack is powered on that the blades will delay their bootup until the SAN is powered on correctly. Is this even possible? We have an AMM in the chassis if that helps. Basically we are looking into the reboot that occurs after power is restored to a UPS. I sincerely apologise for the noobness of this question, but I am a software guy trying to help :)

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• What could cause my LAN Pings be greater than 100ms?

  - by James Holland

  I have 2 servers (Both: Windows Server 2008, Dual Xeon 2.8Ghz, 32GB RAM, 8 x 15k SAS Drives). One of them is a DC / Web server / Exchange Server, the other is a SQL Server (2008). I have a 48 port Netgear GS748T Gigabit switch. When I ping from server to server, I get ping times <1ms, great, but when I ping from a PC, I get varying pings from the occasional <1ms to 500ms!! If I log into either server and look at Task Manager, CPU usage peaks at 20%, memory usage is 100%, but I am led to believe this is normal as Exchange will just use as much as you have, and release it when requested. Network usage peaks at 1%. I really don't understand how the ping can vary that much. I know I am giving very little info, but this is all I know, I apologise, but can anyone help? In response to question, I have pinged by both IP address and hostname, no difference in ping times.

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• Where do I learn about IP blocks and subnets? Or is there just a calculator that does it all for me?

  - by cwd

  Amazon's elastic compute tool (among others) requires the ip block format for their command: ec2-authorize websrv -P tcp -p 80 -s 205.192.0.0/16 I may be doing this wrong, but as far as I can tell I need to use the block format even for a single IP address. 1) So, how would I do that for this IP? 71.75.232.132 Several years ago I took a CCNA class, and I remember going over IPs and subnets, masks, broadcast addresses, class a/b/c networks, etc. However a lot seems to have changed since then - for example I don't think you can tell what "class" a network is in just by looking at it anymore - sometimes they could be multiple classes. 2) Anyhow, my second question is where do I go to get a refresher on all these things? 3) Or should I just be using ipcalc or an online calculator to do it all for me - and if so, which one?

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• LM Sensors always returning same (invalid) value for one temp sensor

  - by pkaeding

  I am trying to monitor the temp sensors on a server, and plot them using Cacti. I have lm-sensors installed and working correctly. For example, here is the output from sensors: % sensors acpitz-virtual-0 Adapter: Virtual device temp1: +26.8 C (crit = +100.0 C) temp2: +32.0 C (crit = +60.0 C) coretemp-isa-0000 Adapter: ISA adapter Core 0: +36.0 C (high = +105.0 C, crit = +105.0 C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +42.0 C (high = +105.0 C, crit = +105.0 C) However, when I try to get this data via SNMP, I get only one sensor's temperature correctly, and another one always returns 100.000 C: % snmpwalk -Os -c public -v 1 10.8.0.18 -m ALL lmTempSensors lmTempSensorsIndex.1 = INTEGER: 0 lmTempSensorsIndex.2 = INTEGER: 1 lmTempSensorsDevice.1 = STRING: temp1 lmTempSensorsDevice.2 = STRING: temp1 lmTempSensorsValue.1 = Gauge32: 26800 lmTempSensorsValue.2 = Gauge32: 100000 So, my question is two-fold: Why is the second sensor that is returned by SNMP giving a value of 100 C (when it should be 32 C) Why are my CPU core sensors not being returned by SNMP?

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