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• can't run binaries or shell scripts

  - by hyperboreean

  I am running Debian testing and I am not able to run any binary or shell script. I keep getting "No such file or directory". The umask is the default one and I haven't fooled around with the paths. Also, I am aware of this question, but it doesn't work out for me - I compiled my code on this machine and trying to run it on the same machine. Also, all of my shell scripts have the correct shebang. Any advices?

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• Is a memory upgrade a viable option to fix performance issues? [closed]

  - by ratchet freak

  I'm currently seeing my PC getting bogged down by Firefox 11.0 alone with only one hundred tabs open. Resulting in a memory use of over 530M , VM size of over 800M and an insane amount of page faults (easily reaching 100 million over the course of the day). The PF delta during normal operation easily reaches 7k with peaks to 15k sometimes reaching over 20k. This leads to a (real) deterioration to response time when switching, opening and closing tabs, opening menus, typing, ... My question is: Am I right in assuming that plugging in more RAM (either adding 2x1GB or replacing the existing RAM with 2x2GB or 4x1GB) will solve this problem? My specs: Windows XP Home Edition SP3 (32 bit) Intel Core Duo 2,4 GHz 2x512MB RAM 800MHz DDR2 (dual channel) 4MB unified cache 320GB HDD Intel G33 (X3100) onboard graphics (no graphics card but PCI express x16 slot is available)

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• Can Windows Home Server be used on an active directory domain?

  - by Parvenu74

  The situation: an Active Directory network with a few dozen machines. Most of the machines have the same vanilla image applied to them so if there was a hard drive failure getting the machine back up to the standard network image would be quick and easy. However, there are a handful of (eight) machines which have rather unique setups (accounting, developers, the "artist" with CS4 and such). For these machines we would like to use Windows Home Server since the backups are automatic and recovery from a machine failure is quite painless. The question though is whether or not WHS can be used on an A/D network. If not, what "set it and forget it" backup/imaging product is recommended for this scenario?

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• Freelance for moderately complex admin support

  - by ongraphs

  Mailing lists and question/answers works great for problems that are independently encountered by several people. But sometimes we (as in experienced amateurs) run into problems that aren't so common, nobody has blogged about it and experts advice not readily available. For IT-admin related stuff can someone please recommend how can amateurs pay experts and get hands on advice. The kinds of problems I am talking about are like setting up nxserver or openvpn on freeBSD box. The install/config is not so simple, the documentation not easy for non-it professionals. Therefore getting step by step advice would be quite helpful. Thanks sandeep

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• Server Requirement and Cost for an android Application [duplicate]

  - by CagkanToptas

  This question already has an answer here: How do you do load testing and capacity planning for web sites? 3 answers Can you help me with my capacity planning? 2 answers I am working on a project which is an android application. For my project proposal, I need to calculate what is my server requirements to overcome the traffic I explained below? and if possible, I want to learn what is approximate cost of such server? I am giving the maximum expected values for calculation : -Database will be in mysql (Average service time of DB is 100-110ms in my computer[i5,4GB Ram]) -A request will transfer 150Kb data for each request on average. -Total user count : 1m -Active user count : 50k -Estimated request/sec for 1 active user : 0.06 -Total expected request/second to the server = ~5000 I am expecting this traffic between 20:00-1:00 everyday and then this values will decrease to 1/10 rest of the day. Is there any solution to this? [e.g increasing server capacity in a specific time period everyday to reduce cost]

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• Does CHECK TABLE add read/write locks?

  - by Ztyx

  Hi, Yesterday I ran CHECK TABLE on a table that is read very frequently. I scanned the MySQL documentation for CHECK TABLE for any mentions of "lock" (and found none) and also noticed that only SELECT privilege was required to run the command. I therefor concluded that the command did not do any read lock and was safe to run even in production. Sadly, running the command took 1 minute and 37 seconds and seemed to block all read access. My question is therefor, does CHECK TABLE do any read lock? Any other reason why I experienced a read block on the table? Thanks

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• Move /var directories to to /mnt on an EC2 instance

  - by Geoff Lanotte

  I am trying to work on a standard configuration for a set of EC2 instances running ubuntu 12.04. These servers are going to be primarily web servers for a Ruby on Rails application. When you configure a new large instance, you are given a primary of 8GB and then ephemeral storage of 400 GB that is mounted to /mnt. It seems logical to me to move some directories that have a potential for growth off to the /mnt directory, I was specifically thinking of /var/www and /var/log. My question is two-fold: Is this a good idea or are there pitfalls that I cannot see? If this is a good idea, how should I go about configuring this. I do have the ability to configure new instances and down our old instances. My concern is over long term, doing this in such a way that it prevents downtime. I am a developer with some experience in devops, but mounting drives is something I have not faced before, so explicit directions would be greatly appreciated.

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• Nginx as a reverse proxy + Apache or completely cut out Apache? (WordPress Multisite)

  - by user715564

  I am starting a WordPress multisite network with domain mapping and I am trying to think through my server set up. Right now, I only have one medium sized VPS but hopefully I will need to add more servers later so ideally the solution will also accommodate future growth. My question is, would it be better to set up Nginx as a reverse proxy with Apache or use only Nginx? It seems like setting up Nginx as a reverse proxy would be easier and offer less of a possibility of problems but, on the other hand, would using only Nginx add substantial benefits?

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• CSS file not served by IIS 7.5 after multiple clear cache refreshes in a row in browser

  - by KenB

  We are experiencing an interesting issue with IIS 7.5 static caching and a css file. When we use IE to hit the page in question everything works fine - 200 OK on css file. When we refresh the page it works fine - 304 Not Modified on css file. When I refresh again with control key it reloads fine - 200 OK on css file. Now if I do a control key + refresh multiple times in a row really fast the css fails to load and in the developer tools network it says "Loading..." for the css file and it hangs never coming back. Any ideas?

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• Setup mail server on VPS?

  - by user41010

  This is a n00b question, sorry. I have a site running on a VPS, now I want to be able to receive mails at [email protected]. How do I need to set up the server? And how should I set up the mail client on my PC to receive those mails? The server is running CentOS/RHEL. I'll really appreciate if someone shed some light on the steps that need to be taken. It will be really helpful. Thanks in advance!

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• How often does a Linux check it's /etc/localtime file

  - by DarkSheep

  I am trying to troubleshoot a problem. Some very helpful information would lead me to a solution is: Often does Linux check the /etc/localtime file? Additionally if there is a configuration file to increase the frequency (for testing) that would be helpful. Normally I would assume that it would check when a call to the ntp server has been executed, but NTP is not installed. It couldn't possibly check every time the date function is called as this would result in many problems on busy web servers. Server is Ubuntu 12.04, but I don't think that is relevant to the question.

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• Is there a BSD equivalent to "!!"?

  - by CT

  I often find myself issuing a command that I do not have the proper elevated privileges for. On Ubuntu I could use sudo !! This would issue the same command with sudo privlidges. Is there an equivalent on OpenBSD? Edit: I should have been more specific on what version of OpenBSD. I am using OpenBSD 4.8 where sudo seems to be installed by default. I have already created a user besides root and edited my sudoers file to allow for that user to use sudo. My question is, is there already a built-in shortcut for the "!!" to use previous command.

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• Wifi Signal Strengths

  - by Phorce

  I hope that I have asked this question in the right topic. Basically I use BT (In the U.K.) and I have problems with my router receiving a strong signal in certain rooms of the house, which, therefore makes the internet really slow in some cases it won't work at all. I have had experience working with Virgin Media (UK) before and just changed the channel number and this worked fine, but, do not know if I would receive the same outcome on BT. Could anyone suggest any other things that I could try alongside of the channel change in order to /hopefully/ get a stronger signal, without having to install Ethernet cable?

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• files appearing empty or only partially transferred on FTP server.

  - by james

  firstly, apologies if this question has been asked and answered before, but I have had a look through related queries and found nothing identical to this. I have had a website for a few years, and have never had any problem uploading any files. But today, when i went to transfer a new html file onto the server...i did so, the file arrived. so i browsed to the file in my browser to check the page as i always do, and the browser wouldn't acknowledge it. after repeated attempts to transfer it, it finally seemed to go over, but only 1/4 of the file size..4KB out of 16KB...so only the top of the page would be viewable in my browser...ive tried transferring on a number of ftp clients and no love... my expertise on this is limited and i cant really think of the next step, the server isnt full, so...im just stumped. any ideas? any and all feedback is great appreciated.

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• Is looking for Wi-Fi access points purely passive?

  - by Aric TenEyck

  Say I carry a Wi-Fi enabled phone or laptop through an area where there are WAPs. Assuming that I don't actively try to connect to them or otherwise interact with them, is it possible for the owner of that WAP to know that I was there? I'm asking this in the context of my earlier question: Looking for MACs on the network I was talking with a friend about my newfound ability to detect phones (and other devices with MAC addresses) on the network, and he pointed out that it might be useful to detect unknown phones on the network; I could use that data to track down anyone who was in my house and brought a Wi-Fi phone with them. So, if I set up a logging fake WAP with no security or encryption, can I glean any useful information about the devices that come into the house? Assuming that the thief doesn't actively try to connect...

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• Fill rows down quickly (column or matrix of zeros)

  - by Mark Miller

  I have an extremely basic question, but I have never found the answer by searching the internet. I simply want to create a large column of zeros with Excel. Sometimes I want to create a huge matrix of zeros (maybe 600 rows by 500 columns) and then replace a few zeros with 1's to create a model design matrix. I have always started by creating a column of, for example, 10 zeros, copying and pasting those zeroes, then copying and pasting the resulting column of 20 zeros, etc., until I had the desired number of rows. Then I would copy and paste that column of zeros one at a time over and over until I had the desired number of columns. This procedure is tedious and time-consuming and I know there must be an easier way. Do you know of any other methods?

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• cp -u is illegal on mac. What are the alternatives?

  - by Barnabas Szabolcs

  I have a MacbookPro Lion, and I have tried to archive my files that is tried to copy and overwrite if the source is newer than the destination. I tried the following command cp -u source destination but it says, -u is illegal. I also did not find --update or -u in the man cp. Can you please help, what can I do in this situation? [I have the question moved over here from SO, so feel free to answer it once more. I hope this is the right way of dealing with this]

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• PC reboots instead of shutting down, no software problem. What could be the cause?

  - by DaVinci

  Hi, first of all: I'm not sure if superuser is the right site for my question and google didn't help. I have a pc here that prefers rebooting to shuting down. Everytime I try to shut the pc down it reboots, however it is possible to turn the pc off by pressing the power button. The problem is not windows-specific, the Ubuntu LiveCD does exactly the same that's why I said that it is no software problem. I checked wake on LAN, it is disabled and I also resetted the BIOS settings to factory default. That might not mean that it can't be a BIOS problem but I don't know what else to try here. I did not check any hardware yet but nothing exploded so far. I don't know what could have caused this behaviour as it is not my PC. The Mainboard is a ASUS P5Q-E P45.

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• In place SQL 2008 upgrade vs. Side by side?

  - by Jim

  I have a SQL 2005 Std edition server with 5 databases in production, 4 db's are used by web-based apps the 5th is a desktop application. My question is should I perform an in-place upgrade or a side-by-side by creating an sql2008 instance on the same box? The machine is a VM on vmware and I'm planning on taking a snapshot before the upgrade and having a 'blackout' window during the upgrade so that I could roll back to the snapshot if things go really bad. Any previous experience and advice is appreciated.

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• Postfix smarthost with diffent relayhosts and sender dependant authentication

  - by mattinsalto

  I've setup postfix as smarthost with different relayhosts and sender dependant authentication. Everything works ok, but I have a performance question. Is it better to send all the email corresponding to a domain through only one account? I mean, now I'm sending each message authenticating to the relay host with the sender credentials. Example: If I have 5 email accounts and I send 10 simultaneous messages from each account, How many times is postfix login to the relay host if I have sender dependant authentication? 5 times? once for each sender 50 times? once for each message If I send all the messages corresponding to one realy host through one account, how many times does postfix login to the relay host? only once? Thanks in advance.

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• Is there a Google Authenticator desktop client?

  - by cwd

  I am using Google Authenticator for 2-step authentication. I like how I can use a code and verify my account using my phone: I realize that the app was designed to run on a device other than a computer to increase security for the computer (in case that it is lost or stolen), but I would like to know if there is a way I can run Google Authenticator on my Macbook. Now, per the Google Authenticator Page it will not run on a desktop: What devices does Google Authenticator work on? Android version 2.1 or later BlackBerry OS 4.5 - 6.0 iPhone iOS 3.1.3 or later However there are several emulators for developers and so I wonder if it is possible to run one of these emulators and then run Google Authenticator with that. I do realize this is not a best practice - but I'm less worried about my laptop getting stolen and more worried about someone just hacking the account. So my question is this: Is it possible to run it on the desktop, even though it is not meant to be / not recommended?

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• Zentyal Server : Setting up secure VPN Client

  - by JustShrey

  I have officially exhausted pretty much all my google-fu trying to set this up so I'm asking my question here. For the record, I am a mid level rookie who has played around with servers in his spare time but have never worked with Zentyal Server. Now, I have been able to set up the server as a gateway, with one Network card being external and the other facing the internal Network. The Internal network computers are able to access the internet without any issues. What I need to do is to setup a open-vpn client on the central server so that all Internet data goes though the secure VPN session. As far as I can see, I can't set up the vpn session through the web admin page. Could somebody point me in the right direction? How would I go about doing this? Regards Shreyas

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• Fully secured gateway web sites

  - by SeaShore

  Hello, Are there any web sites that serve as gateways for fully encrypted communication? I mean sites with which I can open a secured session, and then to exchange through them with other sites in a secure way both URLs and content? Thanks in advance. UPDATE Sorry for not being clear. I was wondering if there was a way to access any site over the Internet (http or https) without letting any Intranet-proxy read the requested URL or the received content. My question is whether such a site exists, e.g.: I am connected to that site via https, I send it a URL in a secured way, the site gets the content from the target site (possibly in a non-secured way) and returns to me the requested content in a secured way.

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• Hardware changes to require XP Activation ? (for a Virtual Machine)

  - by NVRAM

  I have WXP-64 running on a VM and, for testing and performance reasons, I would like to occasionally change the allocations for it. Changes might include: Number of CPU cores, Amount of RAM Add/remove network adapters. But I'm concerned that XP will demand re-activation and that I might eventually have licensing issues if I do this. So, can anyone tell me: What kind of changes trigger re-activation in XP? Is there limits or caveat with regard to re-activation? I've perused this question and the article it references, but wanted more recent and verified info. (FWIW, I'm not trying to cheat: the OS copy was purchased explicitly for the VM.)

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• How to point subdomain to a nameserver?

  - by vonconrad

  I've got an old crusty WHM/cPanel server which I'm trying to get rid of. I've got a new setup on shared hosting which is much cheaper in the long run. The problem is that there are a bunch of websites on the server whose domains I don't have access to. They're currently pointing to name servers of my domain (ns.mydomain.com), but the new provider has their own name servers (ns.provider.com) which I have to use instead. My initial idea was to set up a CNAME to point my name server to my provider's: ns.mydomain.com CNAME ns.provider.com, but I read in this question that this would be a bad idea. The accepted answer suggests using an A record instead, and I want to make sure how this would work. Assuming ns.provider.com has an IP address of 123.123.123.123, is it just a matter of doing ns.mydomain.com A 123.123.123.123? Is there any way the provider could block those requests as the name server domain technically doesn't belong to them?

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