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• What's the situation that requires stateful firewall?

  - by Eonil

  I just know there is two kind of firewalls. Stateless and stateful. It's hard to determine what kind of firewall I have to use. Currently I have to run firewall within same machine runs services, Basically I want stateless because of its less resource consumption. However if it is not sufficient for security, it's meaningless. I'll run HTTP, SSH, NFS (only over SSH), and some custom made server on several TCP/UDP ports. Should I use stateful firewall? (edit) Maybe the question can be assumed as 'Should I use stateful rules?'.

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• Enable Ctrl (or Alt) + arrow keys to mimic 'home' and 'end' functionality

  - by YuKagi

  I am a long time Mac user and I'm now using a Ubuntu machine for development, and while I'm more or less used to a lot of the keyboard shortcuts, one thing I can't get used to is using the 'Home' and 'End' keys to move around lines of text. On a Mac you use "Command + right arrow" to go to the end of a line and "Command + left arrow" to go to the beginning. Is there a way to enable this kind of functionality in Linux? I'm not sure if this would be considered remapping, keyboard shortcuts, or what...

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• Do I need to have a company so that I can buy an SSL certificate that will display green at the address bar?

  - by André Pena

  I have a non-comercial website in which the users store some sensitive information so I feel the need to have a SSL certificate, but it seems that if I don't have a registered company I can't buy a green certificate. I have some related questions: Is it true that if I don't have a company, I can't have a green certificate? If I issue a standard (non-business) certificate that won't go green (from GoDadday, for instance), will it go red? Or will it have a less ugly display.. something more neutral that won't scary the user.

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• choosing the right RAID level for PostgresQL database

  - by Sergey

  Hi, I got an disk array appliance of 8 disks 1T each (UltraStor RS8IP4). It will be used solely by PostgresQL database and I am trying to choose the best RAID level for it. The most priority is for read performance since we operate large data sets (tables, indexes) and we do lots of searches/scans. With the old disks that we have now the most slowdowns happen on SELECTs. Fault tolerance is less important, it can be 1 or 2 disks. Space is the least important factor. Even 1T will be enough. Which RAID level would you recommend in this situation. The current options are 60, 50 and 10, but probably other options can be even better.

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• Why My Hi-Tech Chemical Compound Lost Its Full Effectiveness?

  - by Boris_yo

  I have bought this thing a month ago: It is so far best dust cleaner that i have ever used and all was well until i left it out of its package for half day. Then it became sturdy and could be torn apart, less sticky and flexible which i video'ed here. Can this item be restored back to fully functioning state as it was before? Maybe it just became dry and i should put it in a place with moisture? Since all was in Chinese, i also do not know the storage conditions that must be met.

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• Firewire 800 with Windows

  - by Amitesh

  I have two windows machine with windows server 2003 installed on them. I am running a Lab View script on 1 machine and storing the data. But since it has less memory, I want to transfer data to another machine using firewire 800. Is it possible to configure out the second machine just as an external HDD attached to it and write data directly to it? (This is possible with MACs) Dont want to use the ethernet (internet/ TCP/IP prot.) to transfer the data. Is it possible? Thanks.

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• Mirroring MySQL server with diffrent configuration

  - by HTF

  I have to migrate MySQL server to a different data centre so I would like to create another MySQL slave server in new DC and then promote it to a master later on. I previously used LVM snapshots and Percona Xtrabackup for this purpose but this time I've optimized MySQL configuration file that prevents me from using these methods. Old server (backup): innodb_log_file_size = 256M innodb_log_files_in_group = 3 New server (restore): innodb_log_file_size = 512M innodb_log_files_in_group = 2 The Xtrabackup script and LVM snapshots copy the whole directory structure so the MySQL server won't start because there is a different size for InnoDB logs. Is there any solution to avoid a downtime in this case? I can't use mysqldumps as there is around 8000 databases so I would have to take the server down for a couple of hours. I was also thinking to use the old settings with Xtrabackup and then change it once the new server is promoted to a master - less downtime but I'm not sure if this will work? Thank you Regards

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• quick check of open port

  - by shantanuo

  The following is working as expected. (do not want to use nmap) I need to use nc (or any other built-in centOS) command in shell script to check the port 6379 of a remote server. I want the script to exit quickly if no response received in less than 1 second. But it seems that nc will wait for too long before quitting with exit code of 1 How do I "quickly" check if the port is listening? # time nc -z 1.2.3.4 1234 real 0m21.001s user 0m0.000s sys 0m0.000s # echo $? 1 # time nc -z 1.2.3.4 6379 Connection to 1.2.3.4 6379 port [tcp/*] succeeded! real 0m0.272s user 0m0.000s sys 0m0.008s # echo $? 0

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• Which file system to choose from when formatting 1.5TB hard drive (hdd)

  - by MaxiWheat

  I plan to buy a 1.5TB hard drive soon. I would like to know which file system to choose from when I'm gonna format it. With FAT32, there is a limitation concerning the maximum file size (4GB) that bugs me since I might save large files such as DVD images which are over 4GB. On the other hand, NTFS allows me to save larger files, but seems less compatible with other OS than Windows and is also proprietary to Microsoft. Are there other alternatives ? Can you give me your advices ?

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• Error 1069 the service did not start due to a logon failure

  - by Si

  Our CruiseControl.NET service on Win2003 Server (VMWare Virtual) was recently changed from a service account to a user account to allow for a new part of our build process to work. The new user has "Log on as a service" rights, verified by checking Local Security Settings - Local Policies - User Rights Assignment, and the user password is set to never expire. The problem I'm facing is every time the service is restarted, I get the 1069 error as described in this questions subject. I have to go into the properties of the service (log on tab) and re-enter the password, even though it hasn't changed, and the user already has the appropriate rights. Once I enter the password apply the changes, a prompt appears telling me that the user has been granted log on as a service rights. The service will then start will no problems. Not a show stopper, but a pain none-the-less. Why isn't the password persisting with the service?

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• How can I optimize ubuntu desktop to run my webserver

  - by Parry

  Hi, I am using ubuntu desktop edition to run My drupal website on Intranet. I know for running web servers best thing to install is ubuntu server editions, but due to some problem i am using Desktop edition. I installed XAMPP on my machine an my website is up and running. I want to know how can i optimize my machine?? Since I will not use very less features of desktop editions are there any things which I can remove or stop which will free memory and cpu consumption, are there any packages which i should install to increase the performance of my ubuntu??

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• Compressed disk image on Linux

  - by Aaron Digulla

  I just got my new computer with a much bigger harddisk. I think I copied all important files over but just to be sure, I'd like to keep a disk image of my old disk. To save space, I'd like to compress it but I didn't find an option to mount a compressed image. My goals: Result must be easy to access No need to decompress the whole thing before I can access anything Files should be quick to locate - no TAR/CPIO archive Necessary space should be less than just copying the files over So ideally, I'm looking for a read-only, compressed file system which I can create in a file and which grows automatically.

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• How can I copy the output from a remote command into the local clipboard?

  - by cwd

  I use iTerm2 as my terminal client in Mac OS X. On the local system I can use pbcopy and pbpaste to transfer data between the system clipboard and the terminal, but of course this doesn't work when you're ssh'ed to another machine. Is there some way which I can take the result of a command and copy it to the clipboard automatically? Perhaps an applescript to grab the text on the iTerm windows, then get the next to last line? For instance, if I wanted to copy the current working directory: I run pwd, then use the mouse to select the text, and then press command + c. Is there any better / faster / automatic way of doing this? I'm not looking for a bulletproof solution that would work for every command (eg: might not work when there is a huge scrollback) - I'm just looking for something to make this task that I do quite often a little less tedious. Update I'm looking into using screen to do this, but I'm still not sure if it is possible.

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• Solid Edge ST6 - 2D Modeling: dimensions

  - by juFo

  I'm currently making some 2D drawings in Solid Edge ST6. I have several circles which I need to change so that they have an equal diameter and equal space between both circles, etc... Currently my drawing looks a bit messy with all the dimensions that I use: I use the Smart Dimension tool and the Distance Between tool but I have no clue to make my drawing more readable by adding less dimensions. Is there a way to copy/paste dimensions or let a circle follow the dimensions of one other circle? I hope you understand the question. Thanks in advance (I could not find anything about Solid Edge, so I hope superuser is the correct place to ask.)

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• Putting servers inside a refrigerator? [closed]

  - by Muhammad Jamal Shaikh

  It could be a silly question, but I decided to go for it. I shall be buying 3 servers in the next few weeks to set up a small webfarm at my home. I am told by different people who work in server rooms, that I should keep my servers in an air conditioned room. Which is really expensive, because the temperature here in south asia is between 10 to 50 degrees C. Here comes the funny part: I have an extra fridge in my home, why shouldn't I put the servers inside that fridge? Benefits: I don't have to buy the air conditioner. I don't have to buy the rack mount for the servers. The electricity consumed by the fridge is much much less than AC. Give me your suggestions!

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• eTrayz: Replace base system with a bootstrapped Debian

  - by knoopx

  I bought an eTrayz NAS time ago. The device is more or less good but it ships with a closed-source custom linux and a bunch of broken web-apps. I wanted to replace the whole system with a raw Debian installation. I successfully bootstrapped a Lenny Debian into a chroot and I'm able to use use it. However I would like it to be the default system and to boot automatically at login. The device itself ships with a bundled 2.6.24.4 kernel. I think the kernel is on a dedicated flash memory so I would prefere not to re-flash it. What do you think is the best way to accomplish it?

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• Why do we still have to use drive letters to identify file systems?

  - by Charles E. Grant

  A friend has run into a problem where they installed Windows 7 from an external drive, and the internal boot drive is now assigned to H:. Theoretically this shouldn't cause problems because there are programming interfaces for getting the drive letter for the system drive. In practice though, there are quite a few programs that assume that C: is the only possible location for the system directories, and they refuse to run with the system directories on H:. That's not Microsoft's fault, but it's a pain none-the-less. The general consensus seems to be that a re-install, setting the internal boot drive to C:, is the only way to avoid fix these problems. UNIX-like systems display all file systems in a single unified directory tree and mostly seem to avoid problems like this. Is it possible to configure a Windows system without reference to drive letters, or does the importance of backwards compatibility mean that Windows will be working with drive letters from now until doomsday?

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• How to have a soft-real-time process in presense of heavily swapping IO-intensive background load?

  - by Vi

  schedtool: PID 32301: PRIO 4, POLICY R: SCHED_RR , NICE -20, AFFINITY 0xf ionice: realtime: prio 4 But the music is stumbling anyway. Background load is low prio (SCHED_IDLEPRIO, idle ionice), but uses a lot of memory (more than is physically available) and does a lot of IO and calculations. Latencytop shows about 1500ms for: Following symlink Writing buffer to disk (sync) Page fault Writing a page to disk both for the bg load and for unrelated processes. Load average is 10 and counting. Why cannot it allocate, for example, 200MHZ of one of the cores and 32M of memory and not less than once per second opportunity for IO for mplayer to make it happy while continuing calculations on the background? Or: why it cannot leave background task and swap loving each other but keeping the rest of the system as if there were no background load? How to have RT processes AND heavy bg load simultaneously (without of virtual machines)?

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• Does ZFS cache Compressed or Uncompressed data in a ZFS file-system with compression turned on?

  - by George Bailey

  ZFS supports file-system compression and it also caches frequently or recently accessed data. If a system has lots of CPU but the underlying data storage system is slow. It is possible that ZFS would perform better with compression turned on. This can be easily tested when writing files by measuring CPU and disk usage and throughput. (of course latency may exist,, but this would not be an issue for large files). But what about cache? If data will have to be decompressed every time it is read then this is probably less of a good idea. Is the cached data compressed?. Does anybody have some information on this?

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• How can I install Gentoo on Virtual Box//(Ubuntu 12.04)

  - by Curious Apprentice

  I'm googling for a while about how can I install Gentoo on Virtual Box. The hand book provides less information about installing it on virtual box rather on a real partition. I thought there will be a GUI tool to install Gentoo. [Now I think there is not :(] Whenever I'm booting into gentoo Im going into a LiveDVD environment where fdisk returning "command not found !" (Not sure this is a bug or Im using a wronng command) Now Im not a very exprienced user but do like to learn and play with Gentoo. Any help link will be appriciated. Downloaded File: livedvd-x86-amd64-32ul-2012.iso (Do I need to use Gentoo 64 as OS version in Virtual Box ?)

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• rsync osx to linux

  - by Nick

  I did a backup to a remote nfs folder with rsync, from a MAC to a Remote Debian. The final backup is 58GB less than the original. Rsync says that everything was OK, and nothing to update. Macintosh:/Volumes/Data1 root# du -sh Produccion/ 319G Produccion/ root@Disketera:/mnt/soho_storage/samba/shares# du -sh Produccion/ 260G Produccion/ can I trust in rsync? I'm using rsync -av --stats /Volumes/Data1/Produccion/ /mnt/red/ (/mnt/red is my samba mountpoint) Some differents folders root@Disketera:/mnt/soho_storage/samba/shares/Produccion/tiposok# du -sh * 0 IndoSanBol 0 IndoSans-Bold 0 IndoSans-Italic 0 IndoSans-Light 0 IndoSans-Regular 40K PalatinoLTStd-Black.otf 40K PalatinoLTStd-BlackItalic.otf 40K PalatinoLTStd-Bold.otf 44K PalatinoLTStd-BoldItalic.otf 44K PalatinoLTStd-Italic.otf 40K PalatinoLTStd-Light.otf 40K PalatinoLTStd-LightItalic.otf 40K PalatinoLTStd-Medium.otf 40K PalatinoLTStd-MediumItalic.otf 56K PalatinoLTStd-Roman.otf 12K TCL IndoSans_mac Macintosh:/Volumes/Data1/Produccion/tiposok root# du -sh * 36K IndoSanBol 40K IndoSans-Bold 36K IndoSans-Italic 36K IndoSans-Light 36K IndoSans-Regular 40K PalatinoLTStd-Black.otf 40K PalatinoLTStd-BlackItalic.otf 40K PalatinoLTStd-Bold.otf 44K PalatinoLTStd-BoldItalic.otf 44K PalatinoLTStd-Italic.otf 40K PalatinoLTStd-Light.otf 40K PalatinoLTStd-LightItalic.otf 40K PalatinoLTStd-Medium.otf 40K PalatinoLTStd-MediumItalic.otf 56K PalatinoLTStd-Roman.otf 160K TCL IndoSans_mac

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• Alternatives to Crashplan for VPS?

  - by Chloe

  I use SFTP Net Drive to mount a remote VPS so I can back it up. However, it's taken over 3+ days to scan! I ran 'ls -lR' from my desktop over the mounted network drive and it only took about 5m to list all the files! There are only about 5000 files and 2 GB. I know Crashplan can run headless on the VPS itself, but that sounds like a pain to set up, and it takes so much memory on the server. The VPS doesn't have a lot of memory to spare - it's less than my desktop. Is there another program that can communicate with a Crashplan backup protocol and has a command line interface? backup /home

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• Why does my netbook have more USB controllers than ports?

  - by yodaj007

  My netbook has three USB ports, but when I look in the device manager: Five are listed. Does this matter in the least (or, why are five listed)? The reason I bring this up: See, if I know that two of the devices in the device manager don't actually have physical ports, I can disable then and up that percentage on the other three, correct? I'm constantly being told that my devices can perform faster if I connect them to a USB 2.0 port, but this netbook is less than a year old. Thanks.

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• Blackberry Won't Sync: Says Processing

  - by Noah

  I have a blackberry storm 2 and I have it set up to sync, just like I've done with all the other ones in the company. They pull the address book/contacts from outlook, and aren't synced to an exchange server. I have everything setup and then when I hit synchronize it flashes "processing" the phone shows it trying to sync and then it is done in less than a second. It did warn me that the computer was not supplying enough power to charge the device and it said that I should make sure the drivers are correct. Also, I was warned that the device might not function properly down in the bottom right hand corner. Any ideas? I've uninstalled and reinstalled the blackberry software off the disc.

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• Good documentation tool that is not Latex?

  - by flpgdt

  I am far from being a expert in Latex but I'm ok to document my projects with it. Though I would seldom find people in the corporate word eager to learn latex and going along with the documentation. 99% of the cases they would just ask me the Word version of it. For technical documentation I find less resistance, but still, whenever I start a project with someone not familiar with latex, the starting up is troublesome. That said, latex is a bit of an oversize tool for my needs really. My documents hardly go further from tables, lists, few images and type styles (although I'd love to still be able to produce hyperlinked PDFs). What are other tools there, simpler and with a easier learning curve than Latex, but still PDF worthy and with minimally decent capabilities? It also has to run on windows :( Oh. yeah, MSWord is not an option ;)

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