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• Forgot to unmount/eject external hard drive, lost moved files. Mac OS X

  - by balupton

  So I was using my Mac with my external hard drive connected via USB. I moved about 10 GB of data to it (via drag and drop while holding down the Command key to move the files rather than to copy them). They moved to the drive all right, but as I was having some issues and the Finder crashed after the transfer, I was unable to eject the volume and later everything froze so I had to do a hard restart (hold the power button). When I remounted the volume (plugged the external hard drive back in) it no longer had any of the files which I moved onto it. As it was a lot of data, how can I recover these files?

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• what's the difference between /etc/init.d/sshd start and /usr/sbin/sshd?

  - by jasono

  I'm having issues with passwordless ssh. I've checked, double checked and checked again that I have everything set up correctly. Both machines are RHEL6 and when the destination machine first boots up passwordless ssh does not work. If I stop ssh (service sshd stop or /ect/init.d/sshd stop) and then start it directly (/usr/sbin/sshd) passwordless ssh works fine. If I start ssh via the service (service sshd start or /etc/init.d/sshd start) passwordless ssh does not work. Just for testing I've tried commenting out the entire start() function in /etc/init.d/sshd and replace it with /usr/sbin/sshd - that still fails to allow passwordless ssh. I believe that this means that something in the /etc/init.d/sshd file is causing the screw up but I don't know enough about linux to narrow the issue down.

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• Server downtime - are these APC warnings the cause?

  - by DisgruntledGoat

  Yesterday I had a problem with my dedicated server (Ubuntu 10.04, LAMP). It wasn't down per se, but running incredibly slowly as if we had a massive overload of visitors (though I don't think we did). It's running smoothly again now. I've been checking through log files etc to see if I can find any issues, the only strange thing is a bunch of these errors, occurring at about the same time as the downtime: [apc-warning] Unable to allocate memory for pool. in [file] on line 49. And a bit later on: [apc-warning] GC cache entry '[file1]' (dev=2056 ino=8988092) was on gc-list for 3601 seconds in [file2] on line 746. Could these errors indicate the cause of the server slowdown, or are they simply a result of the server being slow in the first place? What would be the solution?

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• How do you handle the task of changing the schema of a production MySQL database?

  - by Continuation

  One of the biggest complaints I have heard about MySQL is that it locks up a table if you try to change its schema like adding a column or adding an index. By "locking up the table" does it mean I can neither read nor write to the table? Sometimes for hours? That seems a pretty severe limitations. I was going to use MySQL for my new project but this gives me pause. Is there a workaround for this? How do you handle the task of changing the schema of your production MySQL database? By the way someone told me Postgresql doesn't have this problem. Is that true - I can both read and write to a Postgresql table while changing its schema? Is there any performance penalty incurred? Would love to hear your experiences.

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• Both screens always stay on after adding second monitor

  - by J.Merrill

  I had a single 1920x1080 monitor on a Windows 7 desktop PC and, per "power management" (not screen saver), the screen would go blank after 10 minutes. I added another monitor (2560x1600 if that matters) and since then, neither screen has ever blanked. I've tried turning on the "blank" screen saver, but that didn't help either -- I can go away for hours and when I come back, both screens are on. I've seen others with similar issues apparently caused by e.g. wireless mice that seem to move infinitesimally, but I've got the same wired mouse I had before. I can't understand why neither the screen saver nor power management is doing what it should to blank the screens, when "power management" used to do it when there was only one monitor. Maybe it doesn't matter so much with current LCD display technology (no "burn in") but doesn't a monitor use more power when "power management" hasn't turned off the display? Thanks for any suggestions.

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• Storage replication/mirror over WAN

  - by galitz

  Hello, We are looking at storage replication between two data centers (600km apart) to support an active-passive cluster design for disaster recovery. The OS layer will be mostly Windows Server 2003/2008 with some OpenSuSE Linux used for performance monitoring on VMWare or possibly XenServer. The primary application service to replicate is Nvision. Datacenter 1 will have two storage systems for local active-passive or perhaps active-active replication with Datacenter 2 used as a last resport disaster recovery site. We have a handle on most aspects, but I am looking for specific recommendations on storage platforms that can handle remote replication cleanly. Thanks.

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• remove apache tar binary package in centos

  - by user119720

  I need help in removing binary package that had been installed in my linux machine. The scenario that I am having are such as like this: I've already install latest apache that I get from its website(httpd.apache.org) through Unix binary package(tar.gz) After successfully install program,the apache server web perfectly without any issues. But then I having a thought,if there are another latest release version of apache in the future,then I need to make sure that i can upgrading current apache or reinstalling the new version apache. So my question is, how do I ensure that I have remove the old remove apache and all its dependencies so that it will not having conflict(probably) when installing the new apache. Right now the only thing that i can think of is to remove all the apache folder manually : rm -rf /apache2 Hope someone can shed some light about this.Thanks.

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• routing weirdness - traceroute 'vanishes' en route

  - by The Journeyman geek

  I'm attempting to set up one of my boxes as a server (again), but i'm having some odd connection issues- the box itself connects fine to the internet, but trying to connect to my external ip address seems to result in the trace getting 'lost' partway. http://pastebin.com/HCQAGbvn - this is a traceroute from another system that's connected to another ISP - starhub is my own one, while i have another system that i have access to on singtel. I'm wondering if my ISP is messing around with routing, or is something very odd going on. As you note, the traceroute dosen't reach me, but if it helps, i use a dd-wrt router. edit: Facepalmishly, turning the firewall on my router on and off fixed it. I don't get why it dropped off at different ip addresses each time, or why the router set it self to block.. everything, or why it affected the ipv6 tunnel as well.

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• How do we increase the maximum allowed HTTP GET query length in Jetty?

  - by Mike

  We are using Jetty to run an Apache Solr index. We've had some queries that have grown way beyond the previously expected maximum length, and are now having issues wehre most queries are not returning any data because the URL gets truncated. These requests are not being made through a browser, they're being made programmatically using the Apache_Solr_Service PHP library. The application is expecting queries to come in as HTTP GET requests, so simply switching to a POST will not solve this problem. How can we increase the maximum allowed HTTP GET query length in Jetty? Thanks!

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• Windows 2008 x64 displays SP1 when SP2 is installed

  - by Graham Powell

  After setting up a Windows 2008 x64 server (not R2), I installed a number of Microsoft updates. After installing these updates, the computer reports that it has SP1 installed, not SP2. I believe the culprit is KB917607, which allows Windows 2008 to display .hlp files. Now I have to upgrade Internet Explorer on this server, and it won't install without SP2. I am very leery about reinstalling SP2, as I have installed a large number of post-SP2 updates, and I've had issues after reinstalling SP2 in similar circumstances. How can I fix Windows so it reports the correct service pack?

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• Let CGI-PHP load a non-default shared library.

  - by ralle

  In Apache2 I configured PHP as CGI in a virtual host: SetEnv PHPRC "/usr/local/php5.3" ScriptAlias /php5.3 "/usr/local/php5.3/bin" Action application/php5.3 /php5.3/php-cgi AddType application/php5.3 .php Everything works fine. Now I have some issues with the standard version of the GD because it restricts me in settings several hinting and anti-aliasing stuff for fonts. Therefore I want to modify the GD source and create a new shared library. Since I don't want a modifed library in my system I want only PHP to use that library. My question now: How can I change the Apache configuration in a way that PHP uses a certain new version of the library? Something like this does not work: ScriptAlias /php5.3 "LD_LIBRARY_PATH=/path/to/my/lib:$LD_LIBRARY_PATH /usr/local/php5.3/bin"

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• 64 bit Windows 7 + 32 bit windows XP dual boot?

  - by Mick

  I have purchased an i7 based PC pre-installed with 64 bit windows 7 (home premium). Unfortunately some third party 32 bit software that I need to use is not working properly (see stackoverflow.com for details). I am now torn between the plan of installing windows XP 32 bit or making it dual boot. Which option do you think will give me the least problems? And if the answer is dual boot, then can you point me to a good guide for how to do it, preferably a guide specifically for my two OS's created in this order (i.e. 7x64 first). EDIT: the performance of my 32bit programs is critical so am concerned about any kind of 32bit XP "emulation".

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• Has anyboy been able to install Pantograph for Blender on Windows?

  - by S.gfx

  I am specially interested on if somebody is actually doing/maintaining an installer for Windows, as there are quite several issues when installing all dependencies, etc. (for example, there might be someone already doing a Installbuilder installer for it and am just not aware of the matter) If not, at least if someone got it working and has some key tip to share. I am never able to fully get it all up and running. I'd love to have a not super complex way to install each new build of this great vector rendering module for Blender. Edit- Pantograph url: http://severnclaystudio.wordpress.com/bluebeard/a-users-guide-to-pantograph/

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• WGet from one site on a server to another site on the same server

  - by JoshReedSchramm

  Hey all, I've recently been asked to administer a couple ubuntu boxes running web servers. I'm a dev by trade so if this question is fairly noob please forgive. We have about a dozen sites running on this box. 2 of our sites need to talk back and forth over a restful api. Unfortunately we are having issues with the sited connection to each other via wget. When we try and run wget manually from the command line from the server pointing to a site also on that server it hangs and eventually times out. If we do the same thing from outside the server to the same site on the server it works. Is there something that could be preventing sites on the same server from communicating with each other? The same thing happens pinging the site from the server.

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• consulting a network admin for rails and php applications

  - by Karo Devos

  Hi I'm a web developer who writes most of the time rails applications. Next month I'm going to switch from my current VPS to linode. I'm wondering how much it would cost to properly set (or teach me how to do it) everything to get my app up and running. My requirements are probably: nginx/apache, REE/ruby, passenger, full blown php environment, system wide RVM, search engine such a sphinx, being able to perform cronjobs. I have some knowledge of unix and I was able to install everything I needed on my development system. However I had quite a few issues setting up everything on my production server.

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• How to achieve redundancy across data centers?

  - by BrandonBT

  I have a LAMP server with a lot of hardware redundancy built in. I am not worried about the server becoming unavailable. What I am worried about, however, are potential network issues in the data center the server is in. What I would like to have is another server in another data center for redundancy. Load balancing is less of a concern. With that said, I am relatively clueless on two points: How to have two servers in two geographically separate data centers that have exactly the same data, in terms of both files and MySQL databases. How to ensure that all traffic coming into one data center are automatically transferred to the other database in the case of a network or server failure at the first data center. Any guidance on how to accomplish the above two problems would be greatly appreciated.

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• Writing Macros to find a specific cell and paste the value from a control cell into it

  - by G-Edinburgh

  I am having some issues writing a Macro to do the following. I have a very long list of rooms with two columns one containing the room number i.e. B-CL102 and the other containing a varying integer.I am looking to create a new column that will contain another different integer for each of the rooms. Is there any way to write a Macro so that I can use two control cells at the top of the sheet, type the room number into one and the integer matching that room into another, then run the Macro and it will automatically populate the correct cell. Then I can change the two values in the control cells and run the Macro again and so on. Thanks for your help, I have a very minimal amount of experience with Macros essentially just the basics. Thanks G

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• Terminal command to change permissions to my 'Sites' folder and apply change to enclosed items?

  - by Ryan

  Using Snow Leopard, I'm having issues with permissions in my Sites folder. While I can navigate to localhost/~username and read any files or folders there, the same permissions have not been applied to enclosed items, and I get a 403 error trying to access them in the browser. If I select one of these enclosed folders and get info using Finder, I see the user 'Everyone' is set to 'No Access' but I can't change that (this behavior seems buggy, actually). And if I select my 'Sites' folder, the tool to 'Apply to enclosed items' is grayed out... Is there a Terminal command I can use to grant 'Read Only' access to my Sites folder, and all it contains, for the user 'Everyone'?

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• Direct Access on Server 2012

  - by francisswest

  Scenario: Windows Server 2012 with the Remote Access role installed. IP set to static, registered DNS. 3 domain controllers, all running Server 2003 (I suspect this may be the issue) Done so far: DNS registered, firewall turned off after IPsec was applied. Able to ping all 3 DC's with no issues Problem: Going through the DA wizard generates this error. I am logged in as a domain admin, verified that I can ping the DC, verified IPsec allows me to contact it. Since this version hasnt been readily deployed yet, there isnt much help available online from what I can find. Any assistance ayone could provide would be greatly appreciated. I am still new to the server world as far as things are considered. I would fit, user wise, between Superuser.com and serverfault.com (junior admin) Thanks to anyone who may be able to assist!

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• Samba file shares - ownership of folder accessible for 1 group verified by MS active direcctory

  - by jackweirdy

  I have a machine set up to share a folder /srv/sambashare, here's an exerpt of the config file: [share] path = /srv/sambashare writable = yes The permissions of that folder are set at 700 and it is owned by nobody:nogroup at the moment. The problem I face is probably a simple one but I'm fairly new to Samba so I'm not sure what to do. The contents of the share should be accessible to a particular user who will authenticate with domain credentials, checked against Active Directory by kerberos. I haven't got kerberos configured yet as I wanted to test the share as soon as samba was configured, albeit basically, to ensure that it works. I've noticed that I can only access & write to the share when the folder is either owned by the user logging in or made world writable. The key issues are that this folder can't be world writable as it contains sensitive stuff, but at the same time can't be owned by a user or group since they come from the AD server. Anyone know what I should do?

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• XDMCP is slow any ideas? (looking for alternative remote desktops)

  - by peteri

  I've been used to using RDP on Windows to remote to machines, and I've got an asus eee 701 which I want to use to do some *nix programming on. While the eee is a lovely little machine the screen and keyboard are a little small to use for lots of programming. I've tried using Xming (the free version) to remote login into the eee from my desktop using XDMCP (or even using a ssh session as a straight X11 server and no desktop on the eee) the whole thing seems seriously slow over wifi the initial desktop takes at least 5 seconds to paint (might even be 10 seconds I haven't actually timed it). So my real question is what do other folks use for remote control with a GUI for their *nix boxes? I am finding it hard to believe the performance is so bad over a wifi network (It makes the Mac IIs I used to use a college in 1988 seem fast) or is this just a problem with Xming and using say the Cygwin X11 server would be better.

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• Finding Locked Out Users

  - by Bart Silverstrim

  Active Directory up to 2008 network (our servers are a mix of 2008, 2003...) I'm looking for a quick way to query AD to find out what users are locked out, preferably from a batch or script file, to monitor for possible issues with either user accounts being attacked by an automated attack or just anomalies in the network. I've Googled and my Google-fu has failed; I found a query off Microsoft's own knowledgebase that cites a string to use on Server 2003 with the management snap-in's saved queries (http://support.microsoft.com/kb/555131) but when I entered it, the query returned 400 users that a spot-check showed did NOT have a checkmark in the "Account is locked out" box under "account." In fact, I don't see anything wrong with their accounts. Is there a simple utility (wisesoft bulkadusers apparently uses this method behind the scenes, since it's results were also wrong) that will give a count of users and possibly their user object names? Script? Something?

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• Do I need more RAM for programming if I switch to a 64 Bit OS?

  - by Buttercup

  Hi, Given that today (for performance reasons?) variables are usually aligned to the "bit-width" (I wanted to use "word-width" here, but on x86 a "word" is still 16 bits right?) of the processor, would switching from a 32 bit OS to its 64 bit version double the RAM usage? Would this then in turn mean that to do the same work a 32 bit OS can do with 4 GB RAM (well, the 3.x GB actually...) with a 64 bit OS I would need 8 GB of RAM for programming? Please note that I'm only talking about everyday x86 computers here.

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• Problems bringing up a second virtual network interface

  - by tubaguy50035

  I'm having issues adding a second IP address to one interface. Below is my /etc/networking/interfaces # The loopback network interface auto lo iface lo inet loopback #eth0 is our main IP address auto eth0 iface eth0 inet static address 198.58.103.* netmask 255.255.255.0 gateway 198.58.103.1 #eth0:0 is our private address auto eth0:0 iface eth0:0 inet static address 192.168.129.134 netmask 255.255.128.0 #eth0:1 is for www.site.com auto eth0:1 iface eth0:1 inet static address 198.58.104.* netmask 255.255.255.0 gateway 198.58.104.1 When I run /etc/init.d/networking restart, I get a fail error about bringing up eth0:1: RTNETLINK answers: File exists Failed to bring up eth0:1. Any reason this would be? I didn't have any problems with I first set up eth0 and eth0:0.

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• Soft links between samba profile and profile.V2

  - by Alex Rose

  I am currently using a samba server to host windows sessions. For the moment, every machine runs windows XP, but in an upcoming hardware upgrade, I will have new Windows 7 machines installed. The problem is that the user directory changed from XP to 7 (for instance 'My Documents' became 'Documents'). To solve that, samba created a folder called profile.V2, which contains files and folders for Windows 7. Now I would like to link the two profiles folders ('profile' from windows XP, 'profile.V2' from windows 7) so that a user can logon from a XP or 7 machine and still have access to the same files. I tried to create softlinks between folder pairs ('Documents' -­­ 'My documents') and it seems to work. My question is : is it likely to create issues in the future?

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