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• Immutable hard links on ext3/4?

  - by shovas

  In my research on file versioning at the fs level, snapshotting, and related ideas, I took a look at hard-links and exactly what they are and how they behave. Using rsync you can get a pretty slick poor man's snapshotting system up and running on file systems that don't natively support it. But, can you get immutable hard links on ext3/4 or any other file systems for that matter? My definition for immutable hard link is: A hard link which, when changed on one location, becomes a regular copy and no longer a hard link. I would like this because it would enable snapshotting use of the source data to link against instead of a copy of the data (in the case of the rsync snapshotting technique). I have gigabytes of data that can't be duplicated due to space restrictions but I have enough room if I can intelligently snapshot individual changed files with the rest linked to the source not a copy. Given all that, is there some other technique, feature or technology I'm really looking for?

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• HP DL380 RAID5 Mistake

  - by Eddy

  I had drives fail in both logical drives on a server. When I replaced failed 146GB drive in Raid 5 array with four (4) 146GB drives. On reboot the Smart Array controller asked if I wanted to accept data loss. Guess mistake to choose yes. Can't seem to find a way to get system to repair RAID5 but it seems to want to just create a new partition. Is there anyway I can go back and get the system to restore the data from other three drives now that I said accept data loss?

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• Way to access Palm Zlib DB files (.pdb) on Windows or Debian

  - by Italy Kafe

  Is anyone aware of a way to access the data in zlib database files for Palm? The file extension is .pdb, but that extension covers a whole range of formats, so a generic 'pdb viewer' won't necessarily be able to handle this. I'd like to be able to open pdb zlib database files. I'd be grateful for any access method: an app for Windows or Debian, or a library for Python or PHP that makes it possible to access the data in these files. If no such tool exists, does anyone know how to use zlib to decompress the data from such a Palm pdb database?

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• How to make an excel formula which totals several agecent rows based on cell values

  - by Yishai

  I have an excel sheet with three columns: date, person and percentage. I would like to put in a data validation that flags cells if the total for a given data/person combination do not equal 100%. Is that possible? In other words, in the custom formula of a data validation, I would like to make the following type of formula. =if(sum( cells with a (date = the date on this row, person = person on this row))=1) Is there a function which will return the cells in a range conditioned on certain values, or will sum the cells. Note that if it is not possible to do two cells, I have no issue adding a cell which combines both values for the purpose of effecting the lookup.

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• Are there any tools for monitoring individual Apache virtual hosts in real-time?

  - by Dave Forgac

  I'm looking for a way to monitor and record Apache traffic, separated by virtual host. I am currently using Munin to capture this and other data for the entire server however I can't seem to find a way to do this by vhost. This link describes using a module called mod_watch which is apparently no longer in development: http://www.freshnet.org/wordpress/2007/03/08/monitoring-apaches-virtualhost-with-munin/ The file that is listed as being compatible with Apache 2.x is reported to have problems with missing vhosts an reporting data correctly. Does anyone know of a reliable way to determine real-time traffic per vhost? If I can find this it should be easy enough to write a new Munin plugin. Edit: What I'd really like to see is something similar to the Apache server-status scoreboard page with the number of connections / requests separated by virtual host. This would give me the ability to check which vhost may be experiencing a spike in traffic in real time and would also provide the data needed for a Munin module (or some alternative performance monitoring / analysis system.)

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• Prebuilt ActiveMQ Server Based off ZeroMQ

  - by VxJasonxV

  Are there any distributions of fully built Message Brokers that are initially based off of ZeroMQ? I had thought that downloading/installing ZeroMQ would give me such, not just a handful of procedures for rolling me own. Currently we use ActiveMQ, but it is a miserable pain to configure, so I'd rather slim down the profile, unfortunately I learned that ZeroMQ was not a one step solution to achieving that goal. Alternatives are ok, but I'd prefer something less overly verbose in configuration than ActiveMQ's ludicrous amounts of Java configuration. Broker config + Java Logger Config + many other intricacies that I don't wish to deal with. (Read: Preferably not Java based in the first place.) I'm looking for reliable, basic functionality described by JMS brokers. Topics, Queues, Message Persistence, etc.

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• Online backup solution

  - by Petah

  I am looking for a backup solution to backup all my data (about 3-4TB). I have look at many services out there, such as: http://www.backblaze.com/ http://www.crashplan.com/ Those services look very good, and a reasonable price. But I am worried about them because of incidents like this: http://jeffreydonenfeld.com/blog/2011/12/crashplan-online-backup-lost-my-entire-backup-archive/ I am wondering if there is any online back solution that offers a service level agreement (SLA) with compensation for data loss at a reasonable price (under $30 per month). Or is there a good solution that offers a high enough level of redundancy to mitigate the risk? Required: Offsite backup to prevent data loss in terms of fire/theft. Redundancy to protect the backup from corruption. A reasonable cost (< $30 per month). A SLA in case the service provider faults on its agreements.

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• Why suddenly DOS-type hexadecimal file names?

  - by Marvin Nicholson

  One of the fairly recent folders on my XP SATA data drive suddenly shows DOS-type hexadecimal file names (i.e., eight characters with three-character extensions) I deleted them and now my Recycle bin shows them with a tilde (i.e., 194ABE~1.JPG). The images are all valid but the file names I assigned are gone. (The 2-terabyte SATA data drive has no OS, if that matters.) The last time this happened on an IDE drive, I was able to back up all the remaining files just before the drive died. Am I facing the same scenario now with my 2-terabyte SATA data drive? It is only a couple of years old. Should I quickly buy another one and back up 20 years of files to it before my current drive dies?

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• Users in the field and Time Machine

  - by Bart Silverstrim

  We have several users in the field with MacBooks. Because they're not always on the network, they save files locally to their notebooks. Normally I back things up by making quick copies to other media, but with the Macs they have the option to run Time Machine (and the way OS X is designed, they're heavily encouraged to use it.) Question; for maintaining Macs and data, how reliable and thorough is Time Machine for backup/restoration? Does it just back up the user's home directory, or can it restore the Mac if, for example, the drive fails? And are there options for "securing" the data like corporate backup software for Windows does, to encrypt the data on the time machine drive?

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• Path of md device wrong after reboot

  - by flammi88

  I have to set up a software raid (level1) on a Ubuntu server 12.04. It should serve files in the network via Samba. The server has the following disks: 250gb Sata hdd (Ubuntu is installed on that drive) 2 TB Sata hdd (first disk in raid array, data disk) 2 TB Sata hdd (second data disk) I created one partition on every data disk with the type Linux raid autodetect. In the second step I created the raid1 with the following command: mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1 After that, I added the array to the mdconf: mdadm --examine --scan >> /etc/mdadm/mdadm.conf The problem is: After a reboot the array is not available on the path /dev/md0. Instead of that it gets reassembled as /dev/md/0 but it is not very reliable. Has anybody a solution for this issue?

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• Network attached external harddrive from another computer.

  - by Paul Knopf

  I have a server that is setup in raid. It is on the same network as my main computer. I would like to have some of the memory on my server to act as a network attached drive on my main computer. Basically, I want it to be a new data drive (similar two C:\, but 2nd drives are mostly E:). That way, I can reformat my main computer without loosing any important data. And the data that is saved (on server E:\ drive) is secured via raid mirroring.

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• Fixing corrupt AVG vault? All files in USB drive are locked out.

  - by Kelsey

  I was doing a virus scan on an external USB drive and while AVG was scanning my system got locked up and required a reboot. Since that time all data on the external drive is no longer accessible. I can see all the files in the root and directorys but I cannot browse into any of them as Windows 7 gives an error stating they are corrupt. If I show hidden files there is a hidden AVG directory that I know was not there to begin with and I am assuming it is some type of vault to protect files while being scanned. Well not the entire drives contents are unaccessible because I think whatever does the managing of the scan failed during the roobt and left the headers or something in a corrupt state. Does anyone know how to 'unlock' or recover this data? Luckily I can recover this data from other sources as a last resort but I would like to fix this if possible. Any help would be appreciated. Thanks.

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• Issues with partitions WIN 7

  - by pomber

  I was trying to make some space to install linux in my HP notebook. The computer had 4 partitions, I made space shrinking one and created a new one (facepalm) using the windows partitioning tool. It show me some warning message saying something about dynamic partitions, I ingored it, and went to the linux live CD. I installed linux in the new partition, after the installation completed it told me that GRUB cannot be installed I dont remember why. So now, it doesnt boot, neither windows nor linux. After google for a while I found the diskpart command, it gives me this info: DISKPART> list disk DISK ### Status -------- --------------- DISK 0 Invalid DISKPART> select disk 0 DISKPART> select partition Partition ### TYPE ------------- -------------- Partition 1 Dynamic Data Partition 2 Dynamic Data Partition 3 Dynamic Data Partition 4 Primary <- I think I put linux here Any idea whats happening? Or how to solve it? Thanks

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• Excel help vlookup

  - by user123953

  I need a little help with some excel Employee Locations Hours OT Mr.One Station 1 40 6 Mrs.Seven Station 2 30 6 Mr.Two Station 3 30 4 Mr.Three Station 4 40 4 Mrs.Eight Station 1 32 6 Mr.Four Station 2 32 7 Mrs.Nine Station 3 40 6 Mr.Five Station 4 40 7 Mr.Six Station 1 25 2 Mrs.Ten Station 2 40 3 Mr.Eleven Station 3 60 1 I have spreadsheet with to worksheets one is the data sheet (shown above) on the other sheet is a summary, that has the Locations column as data validation list. I wanna use the data validation list to pull all the people and info from a specific location. I tried using a vlookup put I only know how to use to pull one person at a time not a group of specific to a location.

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• Is it possible to manually specify an alternative Procfile on Heroku?

  - by BillyBBone

  I have a repository which can be deployed in two modes: one is a front-end web application, while the other is a data manipulating process which runs non-stop, 24x7. The application runs on Django and connects to a Postgres database. For architectural reasons that I won't go into, I'd like to deploy the app in front-end mode inside as one Heroku application, and deploy the same app (i.e. the same git repo) in the data agent mode, as another Heroku application. Both applications will share the same Postgres connection string, and thus the data agent will feed the front-end app. Is it possible to maintain two separate Procfiles in one repo? This would cause the 3 appropriate dynos to start in front-end mode, and would spin up another process entirely in the other mode.

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• Parse HTTP requests through Wireshark?

  - by diogobaeder

  Hi, guys, Is there any way to parse HTTP request data in wireshark? For example, can I expose the request parameters upon an HTTP GET request (being sent by my machine), so that I don't need to read the (sometimes) truncated URL and find them by myself? I was using Tamper Data and Firebug, on my Firefox, to analyse these requests, but they're not as reliable as a stand-alone tool for monitoring my network interface, but wireshark keeps data too raw concerning HTTP flow. If you guys know any other stand-alone tool that does this (must be Linux-compatible), please tell me. Thanks!

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• How to get top command output to show rake arguments?

  - by wbharding

  In the past, all of our servers have automatically shown command arguments passed to rake when we view them in top. For example: But on this particular server, we get this instead (picture is top running, showing the rake command, but not showing any of the arguments that had been passed to rake): Both servers are running Ubuntu (though the server without rake commands is a newer flavor of ubuntu). Both run rake through ruby enterprise edition (as powered by rvm). Can't seem to find any documentation on how top chooses what to show in the "command" column, other than the obvious "more data/less data" toggle (all screenshots are shown with the extra data enabled. Anyone encountered anything similar to this?

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• restoring myisam mysql db on a different machine

  - by RainDoctor

  I have copied the web db directory(/var/lib/mysql/data/web/), when mysql is not running. I transferred this directory to another machine, where mysql is running. web db's stuff is myisam based. I am thinking about how to restore this on a different server. The strategy I have on my mind is the following. copy the data directory of web db to the new server. on new server, 'create database web', which creates a directory in /var/lib/mysql/data copy all files from the step to the new directory created in 2. bounce mysql My question: how to deal with information_schema for this new db?

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• Excel formula - sometimes array formula, sometimes not

  - by Jonas

  I want to write some data to an Excel file, and I want the first page to show a summary of the data that are spread all over the sheets. The individual data items on a sheet can be included or excluded, and I want the summary to be calculated only on the included values. Thus, I thought I'd use a formula like this to show, for example, an average (for which empty fields shouldn't be counted, either): =AVERAGE(IF('dataSheet1'!$B:$B=1,IF('dataSheet1'!$I:$I<>"",'dataSheet1'!$I:$I,""),"")) If I have this formula in dataSheet1, everything works fine. If I have this formula in the summary sheet, I need to enter it as an array formula, and I have to specify the exact ranges to make it work. Is there a way (aside from adding the average in dataSheet, and then referencing the result in summary) to make the formula work without having it turn into an array formula?

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• ls returns nothing only in certain directories

  - by Jakobud

  I have a raid drive mounted here: /data/ And certain directories like this one: /data/somedir/somesubdir/ when I run ls w/ or w/o any flags, terminal doesn't return anything. It does not return an empty directory listing. It simply goes to the next line and sits there blank with no prompt coming up. I cannot CTRL-C out of it. I have to close this terminal instance and start over. At first I thought it was something to do with the ls command, but its pointing to /bin/ls and I can ls other directories just fine. Also, running this find /data/somedir/somesubdir immediately finds all the files just as expected.

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• Netcat server output with multiple greps

  - by Sridhar-Sarnobat

  I'm trying to send some data from my web browser to a txt file on another computer. This works fine: echo 'Done' | nc -l -k -p 8080 | grep "GET" >> request_data.txt Now I want to do some further processing before writing the http request data to my txt file (involving regex maniuplation). But if I try to do something like this nothing is written to the file: echo 'Done' | nc -l -k -p 8080 | grep "GET" | grep "HTTP" >> request_data.txt (for simplicity of explanation I've used another grep instead of say awk) Why does the 2nd grep not get any data from the output of the first grep? I'm guessing piping with netcat works differently to what I've assumed to get this far. How do I perform a 2nd grep before writing to my txt file? My debugging so far suggests: It is nothing to do with stderr vs stdout Parentheses don't help

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• for what reason live USB linux images are not 100% persistent?

  - by gcb

  I understand that during CD-R times non-persistence had a purpose, but what's the purpose now that pretty much everyone uses USB flash drivers? not to mention USB3 sticks are pretty much 4x faster than my HD raid. I'm writing this while taking a break going over the linux from scratch guide... And i'm still baffled that this is not the norm already with all live images. So, Is there any reason (besides historical) that i'm missing and that will bite me after I finish this ext3-rw image?

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• Duplicate incoming TCP traffic on Debian Squeeze

  - by Erwan Queffélec

  I have to test a homebrew server that accepts a lot of incoming TCP traffic on a single port. The protocol is homebrew as well. For testing purposes, I'd like to send this traffic both : - to the production server (say, listening on port 12345) - to the test server (say, listening on port 23456) My clients apps are "dumb" : they never read data back, and the server never replies anyway, my server only accepts connections, and do statistical computations and store/forward/service both raw and computed data. Actually, client apps and hardware are so simple there is no way I can tell clients to send their stream on both servers... And using "fake" clients is not good enough. What could be the simplest solution ? I can of course write an intermediary app that just copy incoming data and send it back to the testing server, pretending to be the client. I have a single server running Squeeze and have total control over it. Thanks in advance for your replies.

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• dvd burning software for ubuntu

  - by user23950

  I've tried brasero which is the default software for burning data in ubuntu. But it seems to be malfunctioning. I thought it can only burn image files. And it cannot distinguish what file you are burning. I'm burning .avi files to be burned as a data. But I can only see the option burn as an image file. Do you know of any other software for ubuntu that can burn files as a data?

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• Ubuntu User WWW/FTP

  - by SnIpY

  I have a user named 'user' which I use to login to the ftp of my website. However, this presents me with a problem. If I want to allow my user to access to ftp, I have to typ the following: chown -R user:ftpusers /var/www/ By doing this, my website is no longer available when surfing to it. To make it available again, I have to typ the following command: chown -R www-data:www-data /var/www/ the user 'user' is in both the ftpusers and www-data group. How can I fix this so I wouldn't have to typ this anymore? I'm using apache2 and vsftpd on ubuntu

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