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• How to recover deleted NTFS partitions?

  - by Frank

  Last night I made a terrible mistake. I was reinstalling Windows and I accidentally deleted all the partitions on all my drives. I realized my mistake before I had created any partitions, so nothing has been written to any of the disks. I'm currently at my wits' end about what I'll do if I don't manage to recover the data. I have two 1TB drives and a 2TB. One of the 1TB was the drive I was supposed to be reformatting so nothing to be recovered there. I am currently in a Linux livecd. In this article http://support.microsoft.com/kb/245725 Microsoft advises to recreate the exact same partition but choose not to format it, and then recover the backup boot sector from the end of the ntfs volume. But none of the drives I want to recover are bootable drives. So does that mean I do not need to rewrite the boot sector? As in if I simply recreate a partition of the same size it will see all my data? Or would I be better off using the TestDisk utility? http://www.cgsecurity.org/wiki/TestDisk Please help, I'm desperate!!

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• Get Squid to pass X-Requested-With header

  - by tftd

  I have configured a squid 3.1 proxy server. Everything works great except for the X-Requested-With header. I can't manage to figure out how to pass that header to the site I'm attempting to open via the proxy. This is my current configuration: request_header_access Allow allow all request_header_access Authorization allow all request_header_access WWW-Authenticate allow all request_header_access Proxy-Authorization allow all request_header_access Proxy-Authenticate allow all request_header_access Cache-Control allow all request_header_access Content-Encoding allow all request_header_access Content-Length allow all request_header_access Content-Type allow all request_header_access Date allow all request_header_access Expires allow all request_header_access Host allow all request_header_access If-Modified-Since allow all request_header_access Last-Modified allow all request_header_access Location allow all request_header_access Pragma allow all request_header_access Accept allow all request_header_access Accept-Charset allow all request_header_access Accept-Encoding allow all request_header_access Accept-Language allow all request_header_access Content-Language allow all request_header_access Cookie allow all request_header_access Mime-Version allow all request_header_access Retry-After allow all request_header_access Title allow all request_header_access Connection allow all request_header_access User-Agent allow all request_header_access All deny all #remove all other headers # delete "x-forwarder-for.." headers forwarded_for delete request_header_access Via deny all request_header_access X-Forwarded-For deny all I tried to add this line request_header_access X-Requested-With allow all to the configuration but apparently X-Requested-With is an unknown header name... Apparently I'm missing something?

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• managing a high traffic media sharing website

  - by Jordan Westerman

  i'm in the process of developing a website that i predict will generate a lot of traffic. the site will be similar to many other sites offering free media streaming: mp3's. we are going to start with a pretty minimal amount of media to share, but the basic idea is that artists will set up a profile page with music they have made available for consumers to visit the page and listen to the music. we are starting with just a handful of artists, but i think that this project will generate more and more artist pages. eventually i'd like to set it up so consumers can create personalized playlists. how can i best prepare server space and bandwidth capabilities? i have a small team of web designers and programmers working on the site, as i am pretty illiterate when it comes to site management. as the ring leader of this organization, i am more or less looking for financial requirements and monthly burn rate estimates. i don't have a ton of capitol to start with, putting together a business plan, but i am seeking investments. i have a game plan to grow fast enough to be successful, and slow enough to manage the financial growth requirements. any questions i may have failed to ask myself? is it realistic to start this project on a shared server, and upgrade? any financial advice you think i can use? i really appreciate any advice given, as this is my first business venture. thank you all in advance. Jordan Westerman D.B.A. Badfish Productions, LLC

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• How to prevent nginx from locking files on mounted samba partition in Centos 6

  - by Bruce Kirkpatrick

  I'm using nginx 1.3.8 inside a centos 6.3 virtualbox 4.2.4 virtual machine. The system is running the latest software available via yum update. The host OS is windows 7. The site files nginx is serving are on mounted samba partition, which is a folder on the host Windows system. I.e., inside linux, nginx paths are referring to /home/vhosts and this is mounted from D:\vhosts\ on windows. The samba partition is mounted as root with 777 privileges. /etc/fstab looks like this, but with real ip, username, password: //hostip/vhosts /home/vhosts cifs username=username,password=SECRETPASSWORD,uid=root,gid=root,file_mode=0777,dir_mode=0777,rw,_netdev 0 0 I.e. linux/nginx reads from the windows share, and not the opposite. in /etc/samba/smb.conf, I have tried to disable all samba locking features, but it seems to have no effect even after rebooting the virtual machine. locking=no share modes=no oplocks = no level2 oplocks = no kernel oplocks =no I'm receiving "Access is denied" errors in Windows or linux when attempting to overwrite the javascript file in windows that has been accessed at least once with nginx. If I run "service nginx reload", the lock is removed and I'm able to save the file. That's why I think it is nginx causing the lock. The same problem occurs with directories. However, that may be a different issue not related to the use of samba. I'm using samba so that I can manage the source code outside of the virtual machine. Also note that after I run "service nginx reload", the file I'm editing is actually automatically deleted from the windows host. SOLVED: I just reviewed my nginx.conf file. It appears the "open_file_cache" feature is what is causing the lock and deleted files. When I set this option to open_file_cache off;, My problem is resolved. I will repost as the answer when it allows me to do so.

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• btrfs: can i create a btrfs file system with data as jbod and metadata mirrored

  - by Yogi

  I am trying to build a home server that will be my NAS/Media server as well a the XBMC front end. I am planning on using Ubuntu with btrfs for the NAS part of it. The current setup consists of 1TB hdd for the OS etc and two 2TB hdd's for data. I plan to have the 2TB hdd's used as JBOD btrfs system in which i can add hdd's as needed later, basically growing the filesystem online. They way I had setup the file system for testing was while installing the OS just have one of the HDD's connected and have btrfs on it mounted as /data. Later on add another hdd to this file system. When the second disk was added btrfs made as RAID 0, with metadata being RAID 1. However, this presents a problem: even if one of the disk fails I loose all my data (mostly media). Also most of the time the server will be running without doing any disk access, i.e. the HDD's can be spun down, when a access request comes in this with the current RAID 0 setup both disks will spin up. in case I manage a JBOD only the disk that has the file needs to be spun up. This should hopefully reduce the MTBF for each disk. So, is there a way in which I can have btrfs setup such that metadata is mirrored but data stays in a JBOD formation? Another question I have is this, I understand that a full drive failure in JBOD will lose data on the drive, but having metadeta mirrored across all drives, will this help the filesytem correct errors that migh creep in (ex bit rot?) and is btrfs capable of doing this.

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• How to balance the root domain using NS records?

  - by Patrick McCurley

  I have two load balancers that balance incoming traffic across multiple data centers. These work fine. I can test them out by doing an 'nslookup mydomain.com xIP' I have now taken out DNS services with DYN.com to allow me to manage the DNS Zone file so that typing mydomain.com will ask my load balancers what the IP address is to resolve. Step 1 : the NS record for www. I set up A records (glue) for ns1 & ns2, then the corresponding NS record to delegate the DNS lookup to the balancers instead of DYN.com's nameservers. ns1.mydomain.com A [ip address of load balancer 1] ns2.mydomain.com A [ip address of load balancer 1] www.mydomain.com NS ns1.mydomain.com www.mydomain.com NS ns2.mydomain.com All is well - when I type www.mydomain.com, the requests get delegated to my load balancers who provide the IP address of the endpoint and the connect is made successfully. Step 2 : the NS record for root. This is where I run into problems. I need customers to be able to type 'mydomain.com' (without the www) and ALSO get delegated to the load balancers for the IP address. However - of the research I have done, and through the DYN control panel, it seems to be not allowed to provide an NS record for the root - as this overrides the default NS servers. How can i delegate both the root, and the www. to my load balancers?

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• Pentium 4 Willamette vs. Faster Celeron Northwood [closed]

  - by Synetech inc.

  Which is the preferable of the following two processors? Intel® Pentium® 4 Processor 1.70 GHz, 256K Cache, 400 MHz FSB Willamette Intel® Celeron® Processor 2.40 GHz, 128K Cache, 400 MHz FSB Northwood Details: A few months ago my motherboard died, so I bought a used computer that had a 2.4GHz Celeron. My old system had a 1.7GHz Pentium 4, so now I’m trying to decide which CPU to use. Obviously a P4 is preferable over a Celeron, but the Celeron is (significantly?) faster than the P4. I’m wondering if the faster Celeron might be better for certain tasks (ie, stronger but dumber is better at some things than smarter but weaker). I tried Googling for some reviews and comparisons for graphs to get a clear depiction of which is better overall, but found nothing that helped. (I did manage to find one page that indicates (apparently by poll, not benchmark) that the Celeron is better.) So which CPU should I use? Does anyone know of some graphs that I can use to compare the two? The system is a general-purpose machine for word-processing, Internet, and casual games (not Crysis, but not Solitaire either). It will be running Windows XP. The board is a 478 with 400MHz FSB.

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• How small (spec wise) can a virtual machine be and still boot up and run some sort of OS?

  - by IllvilJa

  One of the advantages with virtual machines is that you can be very flexible with their sizes. If the host system permits it, you can have a very large virtual machine with a lot of virtual RAM and disk. Also, you can decide to go the other way around, to give the virtual machine a very modest amount of RAM and disk and then choose and configure the OS appropriately. The question is, how small virtual machines have people managed to setup (and get to both boot up and to run)? Virtual machines doing something usuful is preferable, even if I know "useful" in this context is awfully subjective, but laboratory-cases with a configuration stripped beyond common sense could be intresting as well, just to see what people manage to boot and run. Quite open ended question and quite academic, but think of it: an extremely small VM (which still does something useful) takes very little memory and disk and can be quite quickly saved to and restored from disk. If it's also gentle on CPU resources, one might consider having a huge number of such VMs up and running on a host. (Imagine a VM running just an old Commodore 64 or Commodore Amiga in it. Ok, way wrong CPU architecture for modern Virtualization software running on a x86-based PC but still an interesting thought. You could have quite a few such small VMs running on a modern PC.)

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• Purge print driver cache on windows 7 with powershell script

  - by Doltknuckle

  [Background] We have been having trouble with our network clients suddenly being unable to print. They get an odd error with a hex code. We determined that something in the driver was messed up and we could resolve the issue by clearing the driver cache and reinstalling the driver. This happens to random computers every so often. We're assuming this is a bug with the latest Dell 2330dn driver since that is the only model that has this problem. [Problem] What we are looking to do is write a Powershell script that would clear the driver cache and redownload the driver. I see a ton of scripts out there to manage queues, servers, and ports, but nothing for local driver cache management. [Current Workaround] Since we have to do this manually, I'll write out the steps so you know what we want this script to replicate. Disable print spooler Restart machine Delete contents of: C:\windows\system32\spool\drivers\w32x86 Enable print spooler and start service. Delete the network printer object and re-add network printer off of server. [Request] I'm good enough with powershell to translate the above workaround into a pair of scripts. I'd like to find a more elegant solution then my current workaround. Any suggestions?

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• Configuring port forwarding for SSH - no response outside LAN [migrated]

  - by WinnieNicklaus

  I recently moved, and at the same time purchased a new router (Linksys E1200). Prior to the move, I had my old router set up to forward a port for SSH to servers on my LAN, and I was using DynDNS to manage the external IP address. Everything worked great. I moved and set up the new router (unfortunately, the old one is busted so I can't try things out with it), updated the DynDNS address, and attempted to restore my port forwarding settings. No joy. SSH connections time out, and pings go unanswered. But here's the weird part (i.e., key to the whole thing?): I can ping and SSH just fine from within this LAN. I'm not talking about the local 192.168.1.* addresses. I can actually SSH from a computer on my LAN to the DynDNS external address. It's only when the client is outside the LAN that connections are dropped. This surely suggests a particular point of failure, but I don't know enough to figure out what it is. I can't figure out why it would make a difference where the connections originate, unless there's a filter for "trusted" IP addresses, which is perhaps just restricted to my own. No settings have been touched on the servers, and I can't find any settings suggesting this on the router admin interface. I disabled the router's SPI firewall and "Filter anonymous traffic" setting to no avail. Has anyone heard of this behavior, and what can I do to get past it?

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• Neophyte question about using Subtotal and CountIf in Excel

  - by Andrew

  Hi, I'm using Excel and having some problems with Countif and I don't understand how it works differently from SubTotal. I used the GUI to subtotal stuff and all the subtotals are right. Then I attempted to use the Countif to see how many requirements passed. That worked for the first subtotal only. It's easy to see why. When I look at the box for the subtotal, it says: =SUBTOTAL(3,C286:C292) When I look at my formula for passed requirements, I have: =IF(ISTEXT(A285),COUNTIF(C286:C338,"=Passed"),"") Notice that the last column is wrong. How did the Subtotal manage to keep this correct? I typed in the formula for passed requirements and dragged it down the page. Everything behaved as expected (even the bit about ISTEXT dutifully figured out which row was which), but it got the last row wrong. Any ideas? SRS Maintenance Count 7 44 SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Maintenance Passed SRS Reports Count 12 43 SRS Reports Passed SRS Reports Passed SRS Reports Passed SRS Reports Passed SRS Reports Failed SRS Reports Passed SRS Reports Passed SRS Reports Failed SRS Reports Passed SRS Reports Passed SRS Reports Failed

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• Debian Linux bridging router intermittently dropping packets [migrated]

  - by nomen

  My old Asus router died a few weeks ago, so I thought I'd set up my Debian box to deal with routing my home network. I have a few complications, but I adapted my configuration from a previously working configuration, and I don't see why I am having intermittent problems. But I am having them! Every so often, my SSH connections to the router (and to the Xen virtual machines hosted by the router) just drop. I am unable to use the router's dns server. I can't ping the router. Etc. (I can provide more details, but I'm not sure what will be helpful) /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback # Gigabit ethernet, internal network auto eth0 allow-hotplug eth0 iface eth0 inet manual # USB ethernet, internet auto eth1 allow-hotplug eth1 iface eth1 inet dhcp # Xen Bridge auto xlan0 iface xlan0 inet static bridge_ports eth0 address 10.47.94.1 netmask 255.255.255.0 As I understand it, this is sufficient to create the network interfaces, and even do some switching between Xen hosts and my eth0 interface. I installed and configured Shorewall to manage routing: /etc/shorewall/zones fw firewall net ipv4 lan ipv4 /etc/shorewall/interfaces net eth1 detect dhcp,tcpflags,nosmurfs,routefilter,logmartians lan xlan0 detect dhcp,tcpflags,nosmurfs,routefilter,logmartians,routeback,bridge /etc/shorewall/policy net all DROP info fw net ACCEPT info all all REJECT info /etc/shorewall/rules DNS(ACCEPT) fw net DNS(ACCEPT) lan fw ... and so on, these all work, when the router is accepting traffic at all. /etc/shorewall/masq eth1 10.47.94.0/24 Can anybody help?

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• Configuring port forwarding for SSH - no response outside LAN

  - by WinnieNicklaus

  I recently moved, and at the same time purchased a new router (Linksys E1200). Prior to the move, I had my old router set up to forward a port for SSH to servers on my LAN, and I was using DynDNS to manage the external IP address. Everything worked great. I moved and set up the new router (unfortunately, the old one is busted so I can't try things out with it), updated the DynDNS address, and attempted to restore my port forwarding settings. No joy. SSH connections time out, and pings go unanswered. But here's the weird part (i.e., key to the whole thing?): I can ping and SSH just fine from within this LAN. I'm not talking about the local 192.168.1.* addresses. I can actually SSH from a computer on my LAN to the DynDNS external address. It's only when the client is outside the LAN that connections are dropped. This surely suggests a particular point of failure, but I don't know enough to figure out what it is. I can't figure out why it would make a difference where the connections originate, unless there's a filter for "trusted" IP addresses, which is perhaps just restricted to my own. No settings have been touched on the servers, and I can't find any settings suggesting this on the router admin interface. I disabled the router's SPI firewall and "Filter anonymous traffic" setting to no avail. Has anyone heard of this behavior, and what can I do to get past it?

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• Virtual host config issues in osx 10.7 server app

  - by Benno

  I have two mac mini lion servers setup to run as production and staging machines. My sysadmin decided on these machines over the previous CentOS we had because it had an "interface" to be able to manage it, rather than just the terminal. To be honest, I prefer the terminal. My problem is, the mac osx 10.7 server.app seems to be having issues with the creation of virtual hosts in the 'Web' section. It seems VERY touchy. For example, I cannot create a http virtual host first. I have to create a https host first with a unique dns name 9e..g vuly6), then create the http host with a different dns name to the first (e.g. www), or it appears to override it the first one, even though one is ssl and one is non-ssl. Further, it seems to override perfectly good configurations at random. For example, the default sites directory is usually /Users/default/Sites/Customsites or something, but sometimes when I load the server.app it changes to /var/empty. Also, if I change or add extra virtual hosts after the first one or two, it starts to mess up and the first two virtual hosts start having issues. Has anyone had any experience with setting up virtual hosts via this app? Am I able to manually create these virtual hosts, without using the app, and without the app overriding my settings when I restart apache?

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• How to stop/kill a virtual machine that hangs in "Stopping" state?

  - by SvetP

  Hi, I have a virtual machine that constantly hangs in the “Stopping” state. I’ve red several posts suggesting killing the vmwp.exe process of the machine but I’ve never been able to kill this process neither from the Windows Task Manager nor from an administrative command prompt by using prockill /PID xxxx /F where xxxx was the process ID. The only result that I have is that my machine enters in “Stopping-Critical” state. Even worse, from that point (having a virtual machine hung at stopping) I am unable to manage (stop or start) any other virtual machine on the same host. The only “solution” in that case for me is to stop the Virtual Machine Management Service (vmms.exe) and to restart the physical host. Without first stopping the vmms.exe service my physical host also hangs during the restart. Moreover, there is no any error logged in the Event Viewer. I’ve found some other posts complaining about them problem. On all of them the only suggestion was to kill the vmwp.exe process, which obviously doesn’t work for them too. Can somebody help us with this, pls? Thanks

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• Howto: SaaS / PHP Application / Tenants / Security

  - by Ben Fransen

  Hi all, Being completely new in the webhostingcorner I have a few questions on how to implement/setup a webserver for a SaaS application. I'm about to rent my own server for a new product (CMS) I'm launching in two months. Developing the system wasn't that much of wild ride to me, but a correct way to implement it, is. So lets say this is my situation: I want to host 10 websites for 8 clients. There are 6 single sites, and two clients have two websites they can manage with my software. The CMS must be placed on the server too, all clients are connecting to 1 system The database must be placed Depending on the contract a client makes, the client gets some storage. How to measure the used storage over the DB, FileSystem and email Clients may not, in any case be able to somehow get outside their directory, but from the CMS directory the CMS must be able to create files and dirs in a clients directory (for templates, imagegalleries, widgets, etc, etc). I was thinking about something like a dirstructure like this: ./CMS/ [all CMS files] ./Websites/*/ [all websites] My hostingprovider will install updates to the os (CentOS, latest) and the admin panel (Direct Admin). Is there anybody with experience on this topic? Or do you have some thoughts about it? please join the conversation since I'm completely new to this. Ben

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• Replacing local home server with VPS: Suggestions?

  - by CamronBute

  So right now, I'm running an old box with a 2TB HDD in it. I use this as a file server for the home network, as well as a box for downloading large files which are synced via Dropbox. Lots of other tinkering things, too. Basically, I'm sick of paying extra for the power and having to worry about drive failures and whatnot. I'd rather get a remote server, let someone else manage it and provide access from the Internet. So, I've been looking for a Windows VPS that would give me access to install things and tinker, and I'm having a problem finding a host that offers more than 100GB of hard drive space. If they do offer a package with 100GB of storage, everything else is waaayyyy more than what I actually need. The idea is to create a permanent VPN connection from the cloud server to my home network to provide a transparent solution so I'm not having to go to lengths to transfer files or whatnot. I think a VPS solution will allow me to do this. I would like 1TB of storage space, minimum 100Mbps Internet connection, minimum 250GB bandwidth, admin access. Anyone have anything? Or am I being unreasonable? If I am, why?

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• Inter-VLAN Malicious Code Scanning

  - by Jackthedog

  I am trying to find an inbuilt solution on a Cisco Catayst 3750X Switch to scan all traffic routed from one VLAN to another for malicious code. The situation is that we currently have a development environment which is currently being redesigned to upgrade the network infrastructure to use the 3750X switches to manage server and workstation connectivity as well as inter-VLAN routing. We also have another system that is responsible for taking the builds created on the development environment and imaging various HDDs. Because these are two separate systems, we have a requirement in the workplace to anti-virus scan any data transferred between these systems. This is done by copying the data from the originating system to external USB HDD, scanning in a standalone workstation and then copying the data on to the receiving system. As you can imagine this is extremely tedious and impractical most of the time... (I don't make the rules). Anyway, with this redesign going on, we would like to join the imaging system to the network infrastructure of the development system, keeping separation by the use of VLANs and restricting traffic by using ACLs. As we still have the requirement to scan all traffic I would like to configure some sort of malicious code scanning when ever traffic is routed between these VLANs. I am aware I could install a separate in-line IPS/IDS device, however both systems will be using multiple ports on the switch (obviously), and we won't be able to put a device on each port. I would would prefer not to add additional hardware if the 3750x switch is capable of doing the job. Is anyone aware of any Cisco solution that I could use here, that ideally can be incorporated into the 3750x switch? Thanks in advance.

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• New router messed up server 2003 setup...

  - by Aceth

  Hey, We were sent a new 2wire router today configured it as best we can to match the old bt voyager. We've also got X static IP's. We've manage to get our webserver on one of the new IP's public facing. then we use a hardware firewall which is in a DMZ again with a different static IP. This firewall then is our gateway for our internal LAN. with a few servers etc. The problem we're having is only our PDC (primary Domain controller which has exchange 2003 on) can't ping externally even an external IP. We've connected laptops to the 2wire router and obtain a private ip 192.168.1.X and it works fine can ping etc. our other servers with an internal ip behind the firewall can ping out fine. We've connected to the firewalls logging console and the pings from the server are allowed through so its fine there. The server in question is a Windows server 2003 R2 Enterprise SP2 + Exchange 2003 Server doesn't have firewall turned on. it has static private IP .. gateway is pointing to the right one External Static IP is routing fine inwards We've ran out of ideas .. help??

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• Excel file growing huge (>150 MB)

  - by Josh

  There is one particular Excel file that is used by a number of employees at my company. It is edited from both Excel 2003 and 2007, with the "Sharing" feature turned on to allow multiple writers at once. The file has a decent amount of data on several sheets with some basic formatting, and used to be about 6MB, which seems reasonable for its content. But after a few weeks of editing, the file grew to 10, then 20 MB, and eventually skyrocketed to more than 150 MB, even though it still has about the same amount of data as before. It now takes 5-10 minutes to open it, and that much time again to save it. The first time this happened, I copied the content of each sheet into a new, blank workbook, and saved the new workbook; this brought it back down to about 6MB. Now, it has blown up again. The workbook uses the "Data Validation" feature to limit the values in certain columns to the contents of a few named ranges. Copying all the data into a new workbook means re-setting up all the data validation, which is a pain and not something that we want to do every month. As a troubleshooting step, I tried saving the file in "XML Spreadsheet 2003" format, hoping to get some insight into what was being stored. Sure enough, the file was almost a gig, and almost all of the 10 million lines look like this: <NamedCell ss:Name="Z_21D5114F_E50C_46AC_AA4F_C3FF540C717F_.wvu.FilterData"/> <NamedCell ss:Name="Z_1EE2BA5E_3011_4F9A_8ACD_E58835250FC4_.wvu.FilterData"/> <NamedCell ss:Name="Z_1E3BDCEA_6A72_4ECC_BF4F_7B03CC66181E_.wvu.FilterData"/> I've seen a few VBScripts online to manage and enumerate named cells that are hidden in Excel's built-in interface, though I wonder how they'd handle my 10 million named cells. What I really need, though, is an understanding of why this keeps happening. What actions in excel could be causing this?

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• QNAP NAS 509 (LINUX) - how to unmout busy volume and find physical disk?

  - by Horst Walter

  On my NAS QNAP TS 509 I do have a technical issue. I need to run e2fsck. This works fine for me on md0 (see below), but how can I unmount the busy devices md9 and sda4 in order to do the same. Whenever I try, I fail because the device is busy. [This part is solved, see below] In order to further track down the issue, I'd need to sort out the physical disk to device relationship. How can I find out this, e.g. md0 is a stripped volume on 2 disk (but I need to find out on what physical disk). Remark: As you can easily derive from my questions, I am not a Linux expert, but manage to get along. /dev/ram0 124.0M 94.1M 29.8M 76% / tmpfs 32.0M 80.0k 31.9M 0% /tmp /dev/sda4 310.0M 103.9M 206.1M 34% /mnt/ext /dev/md9 509.5M 39.2M 470.2M 8% /mnt/HDA_ROOT /dev/md0 1.8T 1.4T 444.7G 76% /share/MD0_DATA tmpfs 32.0M 0 32.0M 0% /.eaccelerator.tmp -- Added -- QNAP seems to be based on Busybox. I do not find something like init / telinit / runlevel. At busybox docs it says that I need to run the below. But in /var/service sv is not available. I want to go to single user mode to unmount the devices. # cd /var/service # sv d * # sv u getty* -- Added, thanks A4L -- This QNAP Box runs a special flavor of Linux, so not all SOPs do apply. In my particular case I found a services.sh script, stopping all services. After that the drive could be unmounted. The information passed by A4L is valid and worth reading it, maybe I'll profit from it next time. Links: http://unix.stackexchange.com/questions/19918/umount-device-is-busy and http://unix.stackexchange.com/questions/15024/umount-device-is-busy-why So the unmount issue is solved, still looking for the best option to find the physical to volume mapping.

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• Web hosting for multiple web sites providing system isolation

  - by Justin

  We have a small number of projects where we expect the client will not be maintaining the installed versions of applications we install to power the site (such as Drupal). Given that an important part of security is keeping things updated, we don't want to host these projects on our Plesk-powered dedicated servers that currently host lots of our other client's websites. Our goal is to find a host where we can deploy isolated instances (be these slices, virtual servers, grid servers, etc) for each individual (or groups of 2-3) web sites as we need them. These instances would be completely separate, so that if one web site were hacked it would not impact any other site. Typical hosting requirements: Linux Apache PHP 5 MySQL Supports Drupal Ability to setup a cron task (but we don't need SSH access) Daily backups Virtualized/cloud hosting (we want to avoid shared) Pricing per site is around $25/month OS is patched automatically Some options we have considered but won't work: MediaTemple: Two major data center-wide security incidents and recent downtime foster doubt about this host's technical ability. Slicehost: This would require us to manage the entire server, which we don't want to do. Rackspace Cloud Sites (formerly Mosso): No backup options. Do you have any recommended hosting options for given these requirements?

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• Using native resolution on external display results in stretched, out of bounds image

  - by Roni Yaniv

  I have an HP min 311 netbook with Windows XP, which I've connected to a Samsung SyncMaster 2043BW display via the supplied analog cable. The external display's native res is 1680x1050, which the netbook's ION GPU supports. I've configured the external display as the single display (no cloning or any such fancy stuff). However, once I set the native res, the image just stretches out. It looks squashed, and it goes outside the monitor's edges. In contrast, lower resolutions manage to stay within the monitor's display edges, though obviously they are skewed in some way (vertically or horizontally). BTW, the only res which seems to be displayed relatively clearly (it's the least blurry) is 1280x720. I tried looking all over the web for an explanation/advice but could not find any. I already played with the settings on the external display itself several times. So either it's not that, or I missed something. Has someone run into this issue? I need help.

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• Ubuntu 10.04 server delay responding to AJAX requests

  - by DanielAttard

  I manage a Ubuntu 10.04 server with a couple of domains hosted on it. As I continue to learn more about all these wonderful new (for me), one issue that I have begun to notice is the delay it sometimes takes for the server to respond to certain requests. As an example, when I view the timeline of events using firebug I can see that most of the time when I make a POST, the server responds in under 100ms. Sometimes, however, there is a substantial delay before the RESPONSE from the server. I can't seem to tell when the delay will happen and when it won't, however, when it happens the delay is always for about 4.5 seconds. The delay seems to happen about 30-40% of the time. Here is the section of apache2.conf dealing with logs: # # The following directives define some format nicknames for use with # a CustomLog directive (see below). # If you are behind a reverse proxy, you might want to change %h into %{X-Forwarded-For}i # LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent I have no idea where to look to try and debug this problem or investigate further. Any suggestions?

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• How to eliminate the downtime when a dynamic IP address changes?

  - by xenon

  We currently have a number of client computers linked up to a database server (MS SQL 2008) for replication. The database server recognises the computers based on their Windows hostname. We are using dynamic IP addresses at this time because we tend to change the computers’ hardware quite frequently, and so the MAC address may be different. Unless static IP has a good way for us to manage frequent changing of MAC addresses, we are keeping it to dynamic IP. The problem with dynamic IP addresses, however, is that when a client fetches an new IP from the DHCP, ie, there is a change in the IP address, there is going to have a downtime for the hostname to reflect the new IP address, the client’s DNS cache of the hostname to reload, and also the server’s DNS cache to reload to see the new IP from the hostname. All of these have different timings and the delay can be really bad at times. Restarting the computer doesn't work all the time too. The clients are on Windows 7. How can I eliminate the amount of downtime required when there is a change in IP in the case of dynamic IP addresses?

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