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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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• Linux QoS: bulk data transmission during idle times

  - by syneticon-dj

  How would I do a QoS setup where a certain low-priority data stream would get up to X Mbps of bandwidth, but only if the current total bandwidth (of all streams/classes) on this interface does not exceed X? At the same time, other data streams / classes must not be limited to X. The use case is an ISP billing the traffic by calculating the bandwidth average over 5 minute intervals and billing the maximum. I would like to keep the maximum usage to a minimum (i.e. quench the bulk transfer during interface busy times) but get the data through during idle/low traffic times. Looking at the frequently used classful schedulers CBQ, HTB and HSFC I cannot see a straightforward way to accomplish this.

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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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• Can I take a HDD in Raid1 and plug it straight into a different machine?

  - by jacko

  I would assume that I can just take my HDD out of my NAS (in raid1 mirror) and plug it into another enclosure and have it work off the bat but I'd like to make sure... Any ideas? Edit: My current setup is a Netgear ReadyNAS in (hardware) raid1. I'm hoping to replace this with a home theatre type PC (possibly running Ubuntu), and would like to migrate my data without having to do a bulk transfer over my network between the 2 machines. Can anyone confirm the case for the Netgear ReadyNAS?

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• Accidentally ejected my Verbatim drive and can't get the icon back

  - by Erin

  Hi, I have time machine running on my iMac OSX v10.5.8 and also have a Verbatim 1TB attached that I use as a workspace/scratchdisk so I can manipulate large music files before I transfer them. However, when cleaning behind my computer the other day I think I dislodged the connection (or maybe one of the kids hit the eject button, i don't know) however, I've re-booted many times and it's not reconnected. It doesn't appear in my disc utility windown and I don't know how to get the icon back! I've looked in time machine but it doesn't appear there at all (cos it's not supposed to I think - it's not connected - my mate hooked it up for me and he won't return my calls!). Help. I don't know how to get it back! Sorry for being a plank.

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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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• 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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• How to connect a remote IP Phone to our VOIP Network?

  - by Mistiry

  We have an IP phone system in our office, and about 8 VoIP phones running on the system. We have a remote worker, who is literally states away. We'd like to connect his phone to our VoIP network, so that he has a business phone and an extension to which we could transfer calls. I was thinking, although I don't know for sure, that a pair of Cisco routers could be used in some way to make this work. I imagine a VPN solution, where I have one router connected to the phone network and the other router connected to the remote phone. Then have a site-to-site VPN set up so that the remote router... And that's where I'm stuck. I know the remote router will need to use the DHCP server of the phone system. I've never set up something like this, so I am seeking the help of the community here. What is the best way to get this remote VoIP phone RELIABLY connected to our internal VoIP network?

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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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• Corrupted file, hard drive test?

  - by all-R

  Hi guys, I'm currently on a macbook with a 1TB external hard drive connected trough a USB hub wich is connected on my macbook. The problem is, my disk, wich is partitioned in 2 (one HFS+ and one NTFS) keeps getting corrupted, recently it was my HFS+ partition, I could not repair it using the Apple's Disk utility, but was able to backup my files. Is it synonym that my hard drive is failing? Is it because of my USB hub? I also keep all my iTunes library on my external HD (HFS+ partition), and did a lot of transfer lately, adding files, removing etc. the last time, my partition got corrupted after a lot of deleted items. If anybody has an idea of what to check first, what could cause the problem, I would appreciate it :) Thanks!

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• Throttling apache downloads selectively

  - by Synchro

  I have a linux box running Debian Sarge (old I know) and apache 2.0.54. It serves two kinds of files - regular web pages and small images, and a lot of large podcast mp3s. The podcast downloads swamp the connection and make the rest of the site unresponsive, so I'm looking to throttle the data transfer rate (not the request rate) of just the podcasts. I've set up haproxy using this technique which does what it says it will, but solves a different problem - even only 5 simultaneous podcast downloads is enough to saturate the link. In a perfect world, haproxy would support per-connection throttling, but it doesn't. So far I've looked at mod_bw (won't compile for me, seems unsupported), mod_cband (unsupported, widely reported as problematic) and iptables using tc. The iptables approach would allow me to throttle things, but would not be at all selective, slowing down everything on the server, not just the podcasts, so would just move the bottleneck without changing overall behaviour. Ideas?

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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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• central log-server with auditdisp

  - by johan

  I want to setup a central log-server. The log-server is running with debian 6.0.6 and the audit daemon is installed in version 1.7.13-1. The Clients are running with Red Hat 5.5 and they connect to the log-server via audispd. The connection works fine and i get all messages from each node. My questions is: is it possible that the auditd daemon from the log server write the messages from each node in a separate file? I try to transfer the messages via the syslog daemon, that works but i can not use tools like ausearch to analyze these log-files.

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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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• 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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• 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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• 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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• 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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• Rsync over ssh with root access on both sides

  - by Tim Abell

  Hi, I have one older ubuntu server, and one newer debian server and I am migrating data from the old one to the new one. I want to use rsync to transfer data across to make final migration easier and quicker than the equivalent tar/scp/untar process. As an example, I want to sync the home folders one at a time to the new server. This requires root access at both ends as not all files at the source side are world readable and the destination has to be written with correct permissions into /home. I can't figure out how to give rsync root access on both sides. I've seen a few related questions, but none quite match what I'm trying to do. I have sudo set up and working on both servers.

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• iTunes want to remove my existing apps on iPad

  - by Pablo

  Here is the situation. I connected my iPad to some new PC, Synced, then ticking Sync Apps from Devices-Apps will give me warning that all existing apps on my iPad will be replaced with those from Library-Apps. But in Library I have just couple old apps, which long time ago I used. So how I can sync the library in iTunes with my existing apps from iPad? EDIT: I have tried to click on Transfer Purchases, but not all of the items went to the library, just few of them.

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• teamviewer display is slow to refresh

  - by brunoais

  I'm using teamviewer from time to time to connect my portable computer with my desktop computer when I need to check on something (personal use). One of the main things I've been noticing is that it is quite slow transfering the screen updates that keep happening. This happens more frequently when I'm moving full windows or when I open a window or when watching a small movie clip. I've tested the lowest maximum p2p speed I ever got in the last week between both and it is the desktop's upload speed of 6MB/s with the ping of 40ms (usually ~15 ms). With this I was expecting to have very sharp image and fast transfer speeds which is not what is happening. Just to clarify, both computer's individual core's CPU is not reaching its peak (25%) while teamviewer is active, so the encryption and decryption is not the cause. Why my connection between both computers so slow?

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• How can I format a USB drive as FAT from a MacBook Pro?

  - by Edward Tanguay

  I plugged in a 250GB USB hard drive into my MacBook Pro and want to format it in FAT so I can transfer files back and forth between a windows machine. (My windows7 machine only formats in exFAT which my Snow Leopard 2.6.4 doesn't support until I do the update). So I want to format it on the mac. but when I right click on the drive, it gives me the options to eject, copy, but not to format. I can go into Disk Utilities, click on Partition, but the only option is the "Mac Journaled format". How can I Format my USB drive as FAT from my MacBook Pro?

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• Transferring videos from Sony Video Camera to PC via USB connection

  - by Mehper C. Palavuzlar

  I have a Sony video camera (DCR-TRV340e) and loads of video tapes that I like to transfer to my PC. The camera has USB connection and I've loaded its driver with no problems. Which video software do you recommend me to use? I want to have my videos in XviD format with maximum 1 GB for a 1 hour film. How much time does it take to do that for a 1 hour film? Should I use USB connection or another type of connection? Detailed information about connection and software settings would be highly appreciated.

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• Micro Btx Motherboard Replacement.

  - by Judy

  I got the Vundo virus that took out the mobo and hard drive on my Gateway GT5220. Is there a replacement that will work? I'm willing to keep XP. I want to fix it the cheapest way possible. The mobo is a NVIDIA GeForce 6150 AM2 microBTX with primary IDE and 4 SATA connections. I want to use a new SATA as my primary, but would like to be able to connect my old IDE drives to transfer my pictures from them to the new drive. I would appreciate any help. Thanks!

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• Why is my ftp connection timing out?

  - by NEPatriot

  This is the log info: Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/" is your current location Command: TYPE I Response: 200 TYPE is now 8-bit binary Command: PASV Response: 227 Entering Passive Mode (173,201,145,1,199,43) Command: MLSD Error: Connection timed out Error: Failed to retrieve directory listing The strange thing is that I've set the transfer mode to active... I've called my hosting company support and they're able to connect to this server using my ftp credentials. I've also tried to connect on another machine on my network and have the same issue. Could it be the firewall? My ISP?

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