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  • Backing up data (including mysqldumps) to S3

    - by seengee
    We have a web app on a number of servers and we want to add an additional layer of redundancy by backing up the key data to S3. The key data is the MySQL database and a folder containing dynamically created site assets - predominantly images. Some kind of rsync based solution would initially seem the best plan. A couple of years ago we played with S3cmd (in particular s3cmd sync) with some success but we didn't find it particularly reliable although this may have changed since. Its occurred to me though that a rsync solution might not work particularly well with a single db.sql file created with mysqldump and I assume this means the whole database getting transferred each time, with multiple databases of over 1GB this is going to add up to a lot of traffic (and $s) very quickly. With the image files I could simply just transfer files modified within the last day which would be far more simple. What approach should I look at?

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  • How can I add metadata to NTFS files/folders?

    - by Pwdr
    I want to tag different file types (i.e. .pdf, .epub, .iso, .bin, folders,..) using the same descriptive fields. For example i would like a metadata field "type" which would be "eBook" on pdf- and epub-files, "CD-Image" on iso- and bin-files. I read about Alternate Data Streams (ADS) to make this possible. Does anyone know a good program for Windows 7 to tag different files and search for them? It is important for me, that the metadata is NOT stored in a separate database. I move the files a lot and need to stay flexible (ADSs 'stick' to the files). Any ideas?

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  • How should I compress a file with multiple bytes that are the same with Huffman coding?

    - by Omega
    On my great quest for compressing/decompressing files with a Java implementation of Huffman coding (http://en.wikipedia.org/wiki/Huffman_coding) for a school assignment, I am now at the point of building a list of prefix codes. Such codes are used when decompressing a file. Basically, the code is made of zeroes and ones, that are used to follow a path in a Huffman tree (left or right) for, ultimately, finding a byte. In this Wikipedia image, to reach the character m the prefix code would be 0111 The idea is that when you compress the file, you will basically convert all the bytes of the file into prefix codes instead (they tend to be smaller than 8 bits, so there's some gain). So every time the character m appears in a file (which in binary is actually 1101101), it will be replaced by 0111 (if we used the tree above). Therefore, 1101101110110111011011101101 becomes 0111011101110111 in the compressed file. I'm okay with that. But what if the following happens: In the file to be compressed there exists only one unique byte, say 1101101. There are 1000 of such byte. Technically, the prefix code of such byte would be... none, because there is no path to follow, right? I mean, there is only one unique byte anyway, so the tree has just one node. Therefore, if the prefix code is none, I would not be able to write the prefix code in the compressed file, because, well, there is nothing to write. Which brings this problem: how would I compress/decompress such file if it is impossible to write a prefix code when compressing? (using Huffman coding, due to the school assignment's rules) This tutorial seems to explain a bit better about prefix codes: http://www.cprogramming.com/tutorial/computersciencetheory/huffman.html but doesn't seem to address this issue either.

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  • SSD Performance for PHP?

    - by Andrew Fashion
    My programmer just built an application with PHP using Doctrine ORM (will be a high traffic social networking website), and it's very heavy in PHP/Apache and CPU. The queries are wonderfully fast, and MySQL is barely using any CPU, it's just Apache. I was curious to if an SSD would help speed up PHP/Apache, because I know the bottleneck is in PHP reading multiple files, class files, and loading up a bunch of data. So common sense makes me think if PHP is reading multiple PHP files, an SSD would only help as far as read/write? I was thinking of doing a high performance SSD for the PHP application, but for user image uploads, I would just continue using a 15k SAS. Is there any performance issues regarding using an SSD in this kind of situation? And would it prove to help speed up PHP/Apache, and help the CPU problem out?

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  • Standalone server setup for compute capacity

    - by mikera
    I'm developing an application for my company that will require a lot of compute capacity (running some very big mathematical calculations), and looking for some form of server setup to do this. For various reasons, we want to run this on-site in our office rather than hosting it externally. It's been a while since I last had to set up my own servers so I thought I would tap into the collective wisdom of serverfault! My broad requirements are: Budget $30-50k, with an aim to get as much compute capacity as possible for that budget 64-bit servers suitable to run Ubuntu Linux + Java Some relatively standalone rack that can be installed in secure office space Fast/low latency network connections between the servers, but don't really care about connectivity to the outside world Storage capacity shared between the servers - they don't necessarily need their own storage providing they can be booted from a common image Downtime can be tolerated (since the calculations are run in batch mode) The software itself is fault-tolerant, so there is no need for extra resiliency in the server setup (cheap replaceable commodity parts will be fine in general) Given these requirements what kind of setup would you recommend and why?

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  • Cherokee high virtual memory usage even after disabling I/O Cache

    - by nidheeshdas
    I've Ubuntu 10.04LTS 64-bit running on a openvz container and Cherokee 1.0.8 compiled from source. The virtual memory usage of cherokee-worker is around 430 MB even after disabling I/O cache from Advanced - I/O Cache - NOT enabled. Is this issue particular to openvz? Because many people reported to have successfully reduced virt memory usage by disabling io cache. htop output: http://imgur.com/z5JEL.jpg (newbies not allowed to post image.) thanks in advance. nidheeshdas

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  • Just installed 13.10 and everything is fine except I cannot connect to the internet. Any thoughts?

    - by razorccatu
    I just installed Ubuntu 13.10 on my HP G62 laptop and the install went smoothly. I did the install off of a USB drive after trying ubuntu. While I was testing it, I connected to my Wireless with out issue and surfed a little. After the install, no wireless. I can still connect to my wireless network (at least it tells me I'm connected at full strength) but No servers can be found. I attempted to ping Google to no avail and I attempted to ping my router to no avail. I tried to then hard wire the machine and once again it told me that I was connected but I was not. When I ran dmesg, I got the following message: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolvabe. Please install nss-hostname! Is the hostname the issue? if so, how do I resolve it with out internet connection? If it's not the issue, how do I move forward? Thanks for any help. EDIT. I forgot to attach the image of my ifconfig if that might help.

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  • Facing a character towards the mouse

    - by ratata
    I'm trying to port a simple 2d top down shooter game from C++(Allegro) to Java and i'm having problems with rotating my character. Here's the code i used in c++ if (keys[A]) RotateRight(player, degree); if (keys[D]) RotateLeft(player, degree); void RotateLeft(Player& player, float& degree) { degree += player.rotatingSpeed; if ( degree >= 360 ) degree = 0; } void RotateRight(Player& player, float& degree) { degree -= player.rotatingSpeed; if ( degree <= 0) degree = 360; } And this is what i have in render section: al_draw_rotated_bitmap(player.image, player.frameWidth / 2, player.frameHeight / 2, player.x, player.y, degree * 3.14159 / 180, 0); Instead of using A-D keys i want to use mouse this time. I've been searching since last night and came up to few sample codes however noone of them worked. For example this just made my character to circle around the map: int centerX = width / 2; int centerY = height / 2; double angle = Math.atan2(centerY - mouseY, centerX - mouseX) - Math.PI / 2; ((Graphics2D)g).rotate(angle, centerX, centerY); g.fillRect(...); // draw your rectangle Any help is much appreciated.

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  • Why can't I create a Windows backup on my secondary disk?

    - by Brian Sullivan
    I've installed Windows 7 Ultimate on an SSD that I've added to the XPS desktop that I bought from Dell. I would like to use the built-in backup functionality to create incremental backups and store them on the large drive that came with the machine. I formatted the large drive and turned it into a Basic disk. However, when I try to set the backup location to the large internal disk (E:\) in the "Set up backup" wizard, a get a message saying, "A system image cannot be saved on a drive that your computer boots from or that Windows is installed on." Windows is not installed on that disk. I even deleted the OEM partition that was on the disk, and removed it completely from the boot order in the BIOS. Any clue why Windows is griping at me about this?

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  • DVD RW: Are they still relevant for backups?

    - by Harry
    Hello, With the availability of compact USB memory sticks with much, MUCH higher storage capacities is there still any use-case for taking periodic, incremental backups on DVD/RWs? The DVD/RW has an additional annoyance that you cannot drag and drop files to it as easily as you can on a USB memory stick. So, if I have a 4.7GB DVD/RW, I must re-burn the whole image every time I backup new stuff... with possibly rearranged file/folder structure. Secondly, why in this day and age you cannot install a file-system (like ext3 or FAT32) on a DVD/RW... and likewise on CD/RW's as you can on a USB memory stick? Many thanks, /HS

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  • DVD RW: Are they still relevant for backups?

    - by Harry
    Hello, With the availability of compact USB memory sticks with much, MUCH higher storage capacities is there still any use-case for taking periodic, incremental backups on DVD/RWs? The DVD/RW has an additional annoyance that you cannot drag and drop files to it as easily as you can on a USB memory stick. So, if I have a 4.7GB DVD/RW, I must re-burn the whole image every time I backup new stuff... with possibly rearranged file/folder structure. Secondly, why in this day and age you cannot install a file-system (like ext3 or FAT32) on a DVD/RW... and likewise on CD/RW's as you can on a USB memory stick? Many thanks, /HS

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  • Storing bundled AMI:s at Amazon EC2

    - by Industrial
    Hi everybody, I am totally new on configuring servers and working with EC2, so please bare with me. I managed after a lot of hair pulling to get a server with Ubuntu up and running with memcached and some other goodies that would make a great package for me. I thought that however, when storing it as an AMI with this tool I would be able to have memcached available next time I launched an instance based upon that image. What can I do to make sure that my configuration is saved properly to an instance? Question number two: - Can I someway make a command that is automatically run on server creation, like initiating memcache with "memcache -d -m 1700 -u root" or even a batch of them?

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  • Batch convert of Word docs with images to HTML

    - by dylpickle
    OK, here is my situation: I made a knowledge base for a company, they have about 500 word documents with screenshots in them explaining procedures and such. I can easily paste the text into the cms wysiwyg editor on the knowledge base but the images need to be uploaded one at a time, then sized and placed in the article. Question: Is there any suggestions for an automatic method to to convert the documents to html with the appropriate image tags and links to the images in them, and export/package the images for ftp upload? I can already convert them to HTML automatically using a batch file and a program, but converting the images to the correct tags with href link, then exporting them for ftp is where i need some help. Might not even be possible, but if anyone has tried to do something like this I would like to here how you approached this.

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  • How to move an existing Win7 setup to a RAID-1 array?

    - by Matthew Scharley
    Currently I have a the following setup: Drive A/B: Identical HDD's Drive C: 2TB external drive with plenty of space currently. Hardware RAID controller Currently I have Drive A which is my boot drive (Win7), and Drive C which is a data drive, and Drive B which I only recently received and is blank. What is the best way of moving off of Drive A, setting up the hardware RAID and then migrating my data back onto the RAID array? I'm proficient with Linux, but I'm not sure if I can get away with simply using dd here. There is currently enough free space on Drive C to take 5-6 copies of a disk image of Drive A, so space isn't an issue.

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  • How to manage large number of desktop VMs?

    - by symcbean
    I'm looking at the feasibility of providing remote access to multiple virtual machines. The VMs themselves will provide user desktops. To make best use of the available resources, I'd like the VMs to hibernate when the user disconnects. Which implies being able to start them up when a user connects. Ideally each user would 'own' a VM image - but if not then I'd require that the session was terminated. Obviously this would require the remote access protocol to be tied into the VM management. Is there anything out there to provide such functionality? (extra credit for open protocols! ;)

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  • Creating foreign words' learning site with memory technique (Web 2.0)? Will it work?

    - by Michal P.
    I would like to earn a little money for realizing a good, simple project. My idea is to build a website for learning of chosen by me language (for users knowing English) using mnemonics. Users would be encourage to enter English words with translation to another language and describing the way, how to remember a foreign language word (an association link). Example: if I choose learning Spanish for people who knows English well, it would look like that: every user would be encourage to enter a way to remember a chosen by him/her Spanish word. So he/she would enter to the dictionary (my site database) ,e.g., English word: beach - playa (Spanish word). Then he/she would describe the method to remember Spanish word, e.g., "Image that U r on the beach and U play volleyball" - we have the word play and recall playa (mnemonics). I would like to give possibility of pic hotlinks, encourage for fun or little shocking memory links which is -- in the art of memory -- good. I would choose a language to take a niche of Google Search. The big question is if I don't lose my time on it?? (Maybe I need to find prototype way to check that idea?)

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  • Can not join comp to the domain... greyed out

    - by Logman
    I have an old WinXP Pro SP3 computer I need to join to the domain, simple right? not really. When I go to control panel - system - computer name and click on CHANGE ("rename this computer") everything is greyed out. I can not set it from workgroup to a domain. I am logged on locally as an admin. (Builtin account and one I created) I have checked local policy (gpedit.msc) on the comp, but it feels like a needle in the haystack. I could probably reload an image faster than trying to fix this...but I am curious so I post here to see if anyone knows of it/fix. I tried reseting the policy to defaults, but no luck: secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose EDIT:

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  • Issue with increasing the root partition from the swap

    - by user211761
    I have an issue with increase the size of my root partition. I have ElementaryOS Luna, and while installing it asked me how much space I want to use. I choosed 15 GB for it, because I want to use this as an alternative system. The issue is that after the installation was complete, I found out that my root partition is only 7 GB big, and SWAP is 8 GB which is useless cuz I have 8 GB of RAM. Now I want to shrink the swap and increase the size of my root partition, so I booted the LiveCD and used GParted. I shrinked the swap without any problems, but now I cant add that free space to any partition. I also turned Swap off. I would add a picture, but I need at least 10 reputation to post images ( Stupid ) Its also worth mentioning that in Gparted its showing my partition in a different way. I would post an image BUT I CANT, so I need to write it down. Its something like this [Pointing arrow down] /dev/sda4 Extended /dev/sda5 ntfs /dev/sda6 ext4 (Which is my main partition) /dev/sda7 linux-swap unallocated Picture:

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  • Install Windows XP using USB

    - by AmanBe
    How to install windows xp from usb ? I have the iso image. My cdrom is not working. I read up something on internet about this issue but all the articles are just way too complex and big + they are all different so don't know which one to try. I want to know if someone has tried something like this and to tell me what's the best and easiest way, like some tool that will automatically write the iso file onto the flash drive and make it bootable or smth. Thank you in advance.

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  • Bootmgr is missing for windows xp

    - by user1167074
    I know that there are so many posts on this subject but none of them worked for me. I have Ubuntu on my machine and I would like to install windows xp. As my cd/dvd reader does not work, I made a bootable usb from iso image using UNETBOOTIN, but when I try to boot in through USB it says "BOOTMGR is Missing". I have searched a lot but could not find any solution to it. Please note that my hard disk uses ext4 format and my bootable drive uses NTFS. I have set the Boot Sequence as USB Drive in BIOS. Please let me know if you need any additional information to fix this. Thanks

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  • ideal memory configuration 4 bank, ddr3, AM3+ FX - 1 vs 2 vs 4 dimms?

    - by TardisGuy
    Ok, so ive been looking around, trying to learn and understand the way that ram works. Ive gotten one answer that said "The addressing is best for 2 sticks, and when you use 4; it slows down" Another answer said something like: Theres bank/channel interleave that makes the memory read like one stick Also I read something about the memory density also being a factor. I dug further and found out that theres a higher speed limit on my board for 2 sticks vs 4, so now im trying to put an image in my head of how and why, and... pfft. Can anyone explain, or recommend a resource that would answer these questions?

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  • How does Amazon ec2-user get its sudo rights

    - by Johan
    I am looking for where the default Amazon AMI linux image sets up the privileges for the default ec2-user account. After logging in with this account I can use sudo successfully. Checking via the sudoers file, which I open by running visudo (with no other options) I see a few default settings and permissions for root ALL ALL So ... Where is the permissions for ec2-user assigned? I have not yet tried to add a new permission but ultimately I want to resign ec2-user for systems management tasks and use a non-full root user for administering the applications (stop and start mysql, httpd, edit apache's vhost files, and upload / edit web content under the web root)

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  • Process vsserv.exe attempts connection to unknown host (clients.your-server.de)

    - by pushpraj
    from past few day I notice a new connection is being made from my system, I discovered it within the outpost firewall, it is blocked by default with the reason Block Transit Packets in the image above you can see that the process vsserv.exe is attempting a connection to static.88-198-155-41.clients.your-server.de I tried to search on google but could not find any relevant info, however this link http://www.webmasterworld.com/search_engine_spiders/3963600.htm says that your-server.de hosts bad bots. I am bit concerned if something is not correct. Could you help me understand the same?

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  • mount qcow2 snapshots

    - by phhe
    I'm running some Xen-servers and started migrating to KVM. Currently my guests are either running on raw-images or LVMs. I found libvirt providing some very nice snapshot features (virsh snapshot-create, ...) so I decided to use qcow2 instead of raw/lvm. And here is my question: libvirt creates the same sort of snapshots on the qcow2 image as if I use qemu-img - is it possible to mount them ? I read something about qemu-nbd and the possibility of mounting qcow but I could not find a word about snapshots.

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  • Building modules with linux kernel for custom flavor

    - by Chandan Apsangi
    I followed the instructions given in the link: http://blog.avirtualhome.com/how-to-compile-a-new-ubuntu-11-04-natty-kernel/ for building a custom kernel and booting it. Everything works fine, except that when building it, I used the option skipmodule=true (as given in this link), so I guess the modules are not built for this kernel. I'm saying this because after I installed the image (using dpkg -i), when I run 'ls -l' in the /lib/modules/2.6.38-11-i5 folder, all the files/folders except the 'kernel' folder have got updated (Btw, I had built it last time and it had worked fine,this is an update on the same kernel source). So is there some option/command that I missed that exports the modules as well? Thanks for your help.

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