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• Amazon EC2- micro-instance vs single small/medium instance

  - by shashankaholic

  I have a chat application using stack of Openfire, Tomcat6 and MySQL. Currently, i have installed all these servers on single Linux micro-instance(613 MB memory). Even in low user base 10-20 i am encountering CPU overload which is quite obvious here. As, i am new to Amazon EC2 can somebody suggest me how to scale up my architecture according to traffic use? should i use separate micro instances for every app server(openfire,mysql,tomcat6) should i use single small or medium instance for whole server stack. Some factors in context: high reliance on MYSQL high memory usage due to file transfer web-application interacting with other Amazon service like S3,SES

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• Funnelling http traffic

  - by spencer p

  I have a situation where a large batch of servers (X), on demand, need to request data from a smaller set of web servers (Y). The worst case scenario is if all servers in X decide to fetch different requests to one server in Y. That would be X amount of connections, which could be a very large burst of traffic. The best case scenario is if 1 server in X hit 1 server in Y in tandem. Life does not work like this. One idea to entertain is placing a proxy, similar to squid between X and Y. All of X servers can connect to this proxy, but would result in a few persistent (http keepalive) connections to Y. If The few were say, 3 or 4, then it would funnel. If we could then rate limit those connections and traffic decides to spike unusually high, we wouldn't hurt anyone but ourselves. Thoughts?

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• What is fastest way to backup a disk image over LAN?

  - by David Balažic

  Sometimes I boot sysrescd or a similar live linux on a PC to backup the hardrive over local network to my server. I noticed many times, that the transfer speed is not optimal (slower than HDD and network speed). Any rules of thumb what to do and what to avoid? What I typically do is something like: dd bs=16M if=/dev/sda | nc ... # on client nc ... | dd bs=16M of=/destination/disk/backup1 # on server I also "throw" in lzop (other are way too slow) and sometimes on the fly md5sum calculation (both of uncompressed and compress source). I try to add (m)buffer (or other alternatives) to improve throughput (and get a progress indicator). I noticed that even with enough free CPU, adding commands to the pipeline slows things down. Typically the destination is on a NTFS volume (accessed via ntfs-3g, with the _big_writes_ option).

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• How to use symbolic links in windows server 2008R2 across the network (mklink)

  - by server info

  I have One Server (Srv1) which holds data with file shares and the storage is full. Now I have second Server (Srv2) which has alot more space. No I would like to transfer all the data von Serv1 to Serv2 and have links to the new destination. I found mklink very useful here but unfortunately it does not work over the network. Which also points the docu out. People heavily rely on the path's so it would be helpful if somone has a pointer for me... how to handle symbolic links a cross the network with Windows Servers. I am running Windows Server 2008. Thanks for any help

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• How to change resolution in Ubuntu 10.04, where xvinfo is showing no adapters present?

  - by YumYum

  I am trying to maximize my resolution where I have Resolution: 800x600 (4:3) and Refresh rate: 61Hz I tried the following, but it did not work: $ xvinfo X-Video Extension version 2.2 screen #0 no adaptors present $ cvt 1920 1080 # 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync $ xrandr --newmode clever_name 173.00 1920 2048 2248 2576 1080 1083 1088 1120 $ xrandr -q Screen 0: minimum 640 x 480, current 800 x 600, maximum 800 x 600 default connected 800x600+0+0 0mm x 0mm 800x600 61.0* 640x480 60.0 clever_name (0x11d) 173.0MHz h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.2KHz v: height 1080 start 1083 end 1088 total 1120 clock 60.0Hz $ xrandr --addmode default clever_name $ xrandr --output default --mode clever_name xrandr: Configure crtc 0 failed

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• FTP upload stalls at same point every time on FileZilla

  - by John

  On two different FTP accounts, I am having problems uploading files. I can login and see the contents of the dir, and start an upload. Using Filezilla the transfer seems to always stall at either 0.9% or 1.2% (always those two numbers) and may simply hang, or keep restarting and then again stop at the same point. WindowsXP FTP is not great but I get similar types of problems there... it starts uploading and after a short while I get a timeout error. FTP used to work fine, and I don't know if it's these accounts in particular (both have the same service provider although purchased on opposite sides of the world) or if "FTP is broken on my PC"... can that even happen?!

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• Improve performance on Lync desktop sharing

  - by Trikks

  I'm using Lync 2010 server to handle some clients communication and screen sharing. The biggest issue is the performance with screen sharing, it is of rather high quality but the frame rate is very poor. I have been reading and searching a lot on the subject and 95% of all topics is about bandwidth, we have a 200/200 MBit Internet connection solely for this application. Also my test machines runs on an internal gigabit lan. The speeds between all boxes is hysterically fast. Next step was to ensure that there where some profiles for different bandwidths, so i registered some New-CsNetworkBandwidthPolicyProfile -Identity 50Mb_Link -Description "BW profile for 50Mb links" -AudioBWLimit 20000 -AudioBWSessionLimit 200 -VideoBWLimit 14000 -VideoBWSessionLimit 700 New-CsNetworkBandwidthPolicyProfile -Identity 100Mb_Link -Description "BW profile for 100Mb links" -AudioBWLimit 30000 -AudioBWSessionLimit 300 -VideoBWLimit 25000 -VideoBWSessionLimit 1500 Nothing fancy happend here either. Non of the test boxes have anything from Norton installed, they doesn't have any firewalls running (nor does the Lync server), all fences are down in this environment just for the testing. Is there any thing that I may have missed to improve the quality of this? Thanks

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• Rsync : execute permission required

  - by user651488

  I'm using rsync between two servers to transfer files. The problem is some files are not transferred. I get this error : rsync: readlink "/var/www/index.html" failed: Permission denied (13) So I check permissions on the server and after make tests, I notice a file is transferred only if it has these permissions : R-W ! If the file have these permissions : R--, Rsync can't download it !? Command: /usr/bin/rsync -avzr -e "/usr/bin/ssh -i /home/replication/thishost-rsync-key" [email protected]:/var/www/index.html ./ Is it a bug with Rsync ? I find any information about this problem. Thanks for your help Debian Etch 2.6.30 Rsync 2.6.9 protocol version 29

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• Inexpensive degaussers or HDD shredders?

  - by Nicholas Knight

  I do a lot of work for a small cash-strapped business that has a lot of active hard drives, most are consumer-grade SATA of about five years of age, and predictably they are dying at an increasing rate, and a lot of the time they can't even be detected, let alone complete a zero-out cycle. Right now those drives are just being stored, but that can't continue forever. We've got a couple bad LTO tapes it'd be nice to deal with, too. There are very real security and legal issues that make dropping them off with someone who claims they'll be properly destroyed a gamble. I've looked around at degaussers and HDD shredders, and the ones that don't look like they come from some guy in his basement all seem to be $3000+, which is hard to swallow right now. Is there anything out there in the $500-1500 range that you would recommend? (Speed isn't a big issue, if it takes several minutes or even hours per drive, that's completely OK, we've only got 10 or so thus far.)

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• How To Create An FTP User That Has Permission To EVERYTHING

  - by Serg

  I've spent the last two hours trying to create an FTP user so I can transfer some files over to my Wordpress blog folder. /var/www/sergiotapia.me I'm using vsftpd and Ubuntu 12.04 for my FTP server and I've read tons of documentation, none of which seem to work. I still cannot log in with the FTP user, let alone test if I even have the read/write file permissions. Can a Linux guru here, help me out with a small step by step? I'm comfortable with the terminal and nano, so that's not an issue - I'll SSH into my box. Just tell me what to do and what commands to run. Specifically, this user needs to have read and write access to the /var/ folder and anything within it. I want to have 1 user that can do whatever the heck he wants on my Ubuntu 12.04 VPS machine.

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• SSH rsa key works with external IP not internal IP

  - by Ian

  I am using rackspace cloud hosting. I have 2 servers behind a load balancer. Each server has an external IP and an internal IP. I want to setup a sync job that uses SSH to transfer files. I made an rsa key, and I can successfully SSH from server A into server B, using the external IP of server B, without being prompted for a password. If I try to do the same but use the internal IP, it prompts me for a password. I want to be able to use the key instead of the password. Why is this? Is there something special I have to do during key generation so it works for both IPs? Any help is appreciated.

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• How do I copy hyperlink only (and not text) to another cell?

  - by OfficeLackey

  I have a spreadsheet where column A displays names. There are a few hundred names and each has a different hyperlink (which links to that person's web page). I want to transfer those hyperlinks across to a different column which has different text in and no hyperlinks. Not every cell in column A has a hyperlink. There are groups of cells merged together, so A2:A7 has one link, A8:A13 the next, A9:10 the next (i.e. number of cells merged is not uniform). e.g. where A2:A7 reads "Bob" and links to www.bob.com, I want I2:I7, which reads, "Smith," and does not link to anything, to link to www.bob.com. I want to do this repeatedly, copying links from A2:A579 into I2:I579. The information is copied from a table within a web page, and that is where the hyperlinks come from.

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• How do I analyze an Apache Bench result?

  - by Alan Hoffmeister

  I need some help with analyzing a log from Apache Bench: Benchmarking texteli.com (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Completed 600 requests Completed 700 requests Completed 800 requests Completed 900 requests Completed 1000 requests Finished 1000 requests Server Software: Server Hostname: texteli.com Server Port: 80 Document Path: /4f84b59c557eb79321000dfa Document Length: 13400 bytes Concurrency Level: 200 Time taken for tests: 37.030 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 13524000 bytes HTML transferred: 13400000 bytes Requests per second: 27.01 [#/sec] (mean) Time per request: 7406.024 [ms] (mean) Time per request: 37.030 [ms] (mean, across all concurrent requests) Transfer rate: 356.66 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 27 37 19.5 34 319 Processing: 80 6273 1673.7 6907 8987 Waiting: 47 3436 2085.2 3345 8856 Total: 115 6310 1675.8 6940 9022 Percentage of the requests served within a certain time (ms) 50% 6940 66% 6968 75% 6988 80% 7007 90% 7025 95% 7078 98% 8410 99% 8876 100% 9022 (longest request) What this results can tell me? Isn't 27 rps too slow?

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• What's the easiest way to allow Exchange 2003 remote (no MSO client) users check their Mailbox size?

  - by Myrddin Emrys

  We are migrating from Exchange 2003 with no quota settings to Exchange 2010 with limited mailbox sizes. We are trying to get users to clean their mailboxes prior to the move to reduce the transfer load, as well as to comply with new quotas on the 2010 system. But many users access their mail through webmail only. I cannot see a way for users to access their mail store size in this manner. Has anyone else run into this problem? Is there a good way to easily let users check their own mailbox size? The only thing I've come up with as a workaround is a report that IT generates and mail-merge it out to users daily with their current mailbox size. This is cumbersome and time consuming compared to a way for them to check their own mailbox size however.

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• Upgrading from 32 to 64 Bit Windows 7, without losing program installations/games

  - by Fogest

  I recently built a new computer and put the wrong installation of Windows on (32 bit), meaning I cannot use all of my RAM. I would like to upgrade to the 64 bit version, though I already have downloaded many programs and games which would total to around 30 GB give or take. I don't have the kind of data usage with my ISP to re-download this much data again, until next month (total GB will be higher as time goes on). I know there is Windows Easy Transfer, but it is not so much my data itself I'm worried about, it is more having to re-download and install a bunch of games and applications. Is it possible to perform an upgrade from 32 bit to 64 bit without this loss?

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• Text on Cisco ASA console is garbled/missing letters

  - by Some Linux Nerd

  I've actually looked up a number of solutions for this problem and none of them work. There's this Cisco ASA 5505 that I'd like to use, that outputs mildly garbled text with missing characters. I did some googling and found that the most likely problem is a bad baud rate, so I tried all the baud rates, 7N1, 8N2... basically every possibility minicom had. Then I figured (since I can type ok, just not read) that if I factory reset it that it would fix whatever is set wrong with the terminal. That didn't work either. This usb-db9 adapter and console cable work fine on the catalyst switch in our office. My serial settings are 9600 8N1 with no flow control. Anyone know how to fix this? I have an example of the text on pastebin: http://pastebin.com/MAJF0mVU - it's just lots of "Dfaut cnfiuraionfil cotais 1enty." instead of "Default configuration blah blah"

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• Emails intended as HTML are received as plain text

  - by Jeremy

  I'm regularly receiving emails from a well-known public website that read as plain text without carriage breaks or effective hyperlinks. My email client is Thunderbird. Thunderbird helpsite doesn't display an answer. And I'm reluctant to complain to the website if the problem is at my end. Message source for headers includes this: Content-Type: multipart/alternative; boundary=--boundary_9338_03b8c925-816e-4b55-95c4-b2593da7e5f6 The content in message source that follows the header is preceded by this: ----boundary_9338_03b8c925-816e-4b55-95c4-b2593da7e5f6 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: base64 The content itself in message source reads typically like this: PCFkb2N0eXBlIGh0bWwgcHVibGljICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9u YWwvL0VOIj4NCg0KDQo8aHRtbD4NCjxoZWFkPg0KPG1ldGEgaHR0cC1lcXVpdj0iQ29udGVu, etc.,etc. And, as I've said, the message in the viewing pane is unadulterated plain text. Can you tell me - where is it all going wrong? Thanks.

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• Amazon EC2- many micro-instances vs single small/medium instance

  - by shashankaholic

  I have a chat application using stack of Openfire, Tomcat6 and MySQL. Currently, i have installed all these servers on single Linux micro-instance(613 MB memory). Even in low user base 10-20 i am encountering CPU overload which is quite obvious here. As, i am new to Amazon EC2 can somebody suggest me how to scale up my architecture according to traffic use? should i use separate micro instances for every app server(openfire,mysql,tomcat6) should i use single small or medium instance for whole server stack. Some factors in context: high reliance on MYSQL high memory usage due to file transfer web-application interacting with other Amazon service like S3,SES

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• Dark Windows 7 Screen

  - by user147521

  My Gateway laptop -Windows 7- screen became too dark a few days ago after I finished installing Windows automatic update. I can see nothing unless I use a flashlight. Windows login screen is the only bright screen for few seconds. What should I do to resolve this issue? I checked power-saving/ Power Options settings and rebooting in Safe Mode. I tried to lower the refresh rate but it did not allow me. The laptop adapter type is ATI Radeon Xpress series. I uninstalled and reinstalled the driver. And the driver is up to-date. Any help would be appreciated.

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• Help accessing Beagle over serial with Minicom/GTKTerm

  - by mrgordon

  I am trying to access a brand new Beagle Board from Ubuntu or Mac over serial using the setup seen here: http://specialcomp.com/beagleboard/RevC1.htm I got Minicom and GTKTerm installed on the Ubuntu box. I set up the correct baud rate, turned off flow control, and have tried ttyUSB0 and ttyS0. Once minicom is configured properly, I should just see the init text from the board appear if I have minicom open in terminal while I plug in the board, correct? dmesg shows ttyUSB0 on the computer has been connected to ttyS0 on the beagle.

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• 550 operation not permitted using FTP

  - by monkey_boys

  I'm using FTP to manage some files on a site I run but keep seeing this (truncated) error log: Command: DELE calendarpermission.php Response: 550 calendarpermission.php: Operation not permitted [...] Command: DELE button_down.gif Response: 550 button_down.gif: Operation not permitted Command: CWD /domains/example.com/public_html/admincp Response: 250 CWD command successful Command: PWD Response: 257 "/domains/example.com/public_html/admincp" is the current directory Command: RMD control_examples Response: 550 control_examples: Operation not permitted Command: CWD /domains/example.com/public_html Response: 250 CWD command successful Command: PWD Response: 257 "/domains/example.com/public_html" is the current directory Command: RMD admincp Response: 550 admincp: Operation not permitted Status: Retrieving directory listing... Command: PASV Response: 227 Entering Passive Mode (122,155,5,50,138,244). Command: MLSD Response: 150 Opening ASCII mode data connection for MLSD Response: 226 Transfer complete Status: Directory listing successful Status: Set permissions of '/domains/example.com/public_html/admincp' to '777' Command: SITE CHMOD 777 admincp Response: 550 CHMOD 777 admincp: Operation not permitted What do I do to solve this?

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• ASA Slow IPSec Performance

  - by Brent

  I have a IPSec link between two sites over ASA 5520s running 8.4(3) and I am getting extremly poor performance when traffic passes over the VPN. CPU on the device is 13%, Memory at 408 MB, and active VPN sessions 2 so the load on the device is particularly low. Screenshot of wireshark file transfer between the two hosts over the VPN: The large amount of Header checksum failures is alarming, but I am not sure what to check now. I perf is showing around 4-5 Mbit/sec with differing TCP window sizes. Show Run on the ASA http://pastebin.com/uKM4Jh76 Show cry accelerator stats http://pastebin.com/xQahnqK3

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• Poor quality when trying to stream a 720p video to XBox 360 using Media Center Extender

  - by MBraedley

  I have my XBox 360 set up as a Media Center Extender for my Windows 7 desktop. SD quality avi videos stream fine to my XBox, either though the video library or through Media Center Extender, but when I try a 720p mkv file, the frame rate plummets and the A/V sync is completely lost. I don't want to transcode or switch container formats (mkv isn't supported by the 360), but still want to stream. Both my desktop and 360 are plugged into the same gigabit switch, which is plugged into my ISP supplied modem/router. The video plays fine on my machine in a number of programs. Considering that I should have more than enough bandwidth to accommodate this video, why won't it play back properly?

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• Is there a way to tell if a file is done copying?

  - by Mike Cooper

  The scenario is this: Machine A has files I want to copy to Machine C. Machine A can't access C directly, but can access Machine B that can access Machine C. I am using scp to copy from Machine A to B, and then from B to C. Machine B has limited storage space, so as files come in, I need to copy them to C and delete them from B. The second copy is much faster, so this is no problem with bandwidth. I could do this by hand, but I am lazy. What I would like is to run a script on B or C that will copy each file to C as each one finishes. The scp job is running from A. So what I need is a way to ask (preferably from a bash script) if file X.avi is "done" copying. Each of these files is a different size, and I can't really predict size or time of completion. Edit: by the way, the file transfer times are something about 1 hour from A to B and about 10 minutes from B to C, if time scale matters at all.

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• ctrl-v key on AIX

  - by antenore

  Hi all, I'm new to AIX and I miss some tricks that work well on other *nix flavors. I need a CTRL sequence in a ksh scripts, like ^[ (CTRL-[) and to do that I'm habit to use the ctrl-v[ , but here it doesn't work. At the moment I'm obliged to use a windows box with putty so I cannot even edit the scripts on my Linux box and transfer the scripts on the AIX server. Do you know why and how I can fix the issue? Thanks in advance Kind regards Antenore.

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