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• Recommend a mail server setup for multiple domains

  - by Greg

  Hi all, I've just set up a new Debian web server which I have done plenty of times before, but I want to add a mail server which I have never done before. I am aware of this question, but I would like someone to recommend packages and briefly explain how to use them for providing pop/imap access on multiple domains, a concept that has confused me for a while. I'm planning for this server to grow slowly but surely, from serving an initial 5 or 6 domains to about 20 in the first year, continuing at this rate. (yes, I've jumped on the cloud bandwaggon). At the moment, I have a DNS-A record pointing to my server's IP and nothing else. I'm assuming that I need a DNS-MX record pointing there too, but I haven't read up about it yet so today that's what I'll be doing. Hopefully reading up on the subject and the help that I get here will get my server up and running in no time. Thanks!

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• Upgrading from MySQL Server to MariaDB

  - by Korrupzion

  I've heard that MariaDB has better performance than MySQL-Server. I'm running software that makes an intensive use of MySQL, thats why I want to try upgrading to MariaDB. Please tell me your experiences doing this conversion, and instructions or tips. Also, which files I should take care of for making a backup of MySQL-Server, so if something goes wrong with MariaDB, I could rollback to MySQL without issues? I would use this but i'm not sure if it's enough to get a full backup of MySQL-Server confs and databases mysqldump --all-databases backup /etc/mysql My Environment: uname -a (Debian Lenny) Linux charizard 2.6.26-2-amd64 #1 SMP Thu Sep 16 15:56:38 UTC 2010 x86_64 GNU/Linux MySQL Server Version: Server version 5.0.51a-24+lenny4 MySQL Client: 5.0.51a Statistics: Threads: 25 Questions: 14690861 Slow queries: 9 Opens: 21428 Flush tables: 1 Open tables: 128 Queries per second avg: 162.666 Uptime: 1 day 1 hour 5 min 13 sec Thanks! PS: Rate my english :D

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• Is it possible to limit output bandwidth between eth0 and lo?

  - by mmcbro

  I'm trying to limit the bandwidth between my eth0 output (nginx proxy) to my loopback inteface (apache) by filtering on destination port. Incoming Packet -> Eth0 -> 0.0.0.0:80 Nginx -> tc qdisc class/iptable mangle 2525port -> 127.0.0.1:2525 Apache I don't know if it's even possible I'm just experimenting. My rules are the followings : tc qdisc add dev eth0 root handle 1:0 htb tc class add dev eth0 parent 1:0 classid 1:10 htb rate 2mbps ceil 2mbps prio 0 tc filter add dev eth0 parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10 iptables -A OUTPUT -t mangle -p tcp --dport 2525 -j MARK --set-mark 10 I also tried to with FORWARD chain but its still the same.

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• proxy software that supports parallel transfer

  - by est

  Hi guys, I need to setup a really fast proxy server in a remote server, here's the scenario: The server prefetches 3KB of data, mostly HTTP resources. The server send to client 3KB of data, instead of traditional HTTP or SOCKS proxy, the server open multithreaded transfer with 3 connections, send 1KB of data per thread to each connection The client receives 1KBx3, and combine them to the original 3KB data, and return as a local HTTP proxy server. The client display the original data in browser via the local HTTP proxy The latency is not important as long as the transfer rate is good. Does any software like this exist? It's better if it's open source or free ones.

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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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• Scalable WordPress Host for High-Volume Site?

  - by Jonathan Eunice

  I need recommendations for a scalable web host for a high volume WordPress web site. For my purposes, high-volume might be 100K-500K visitors/hour. Might think towards a 1M/hour burst rate as a "high water mark." I know WP isn't the highest-performing platform out there (ha!), but it's non-negotiable. I can do "the usual optimizations" (e.g. put static files in a CDN, run and follow the advice of performance analyzers like YSlow, etc). But it will still be WordPress, and there will be a dozen or so plugins involved. So, where to host the site? Most "what's the best WordPress host?" discussions seem to focus on lowest-cost. I need the opposite. What are the high-volume, scalable, or clustered WordPress hosts with which you've had great experiences?

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• How do I get a new column from a Sharepoint list into Excel?

  - by Jono

  I've been using Excel to process data from a Sharepoint list for a while now. However, I recently added a column to the Sharepoint table, and when I refresh the data in Excel, I don't get the new column. I perform a lot of calculations based on this data, so creating a new worksheet with the "new" Sharepoint list, moving the calculations and the pivots to THAT sheet is more hassle than I'd like to face. Is there a way to force Excel to display this new column that I've added? Maybe by modifying the connection string?

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• Safari on Mac OS X lasts beyond Empty Cache

  - by Mitch

  So, I broke a website with some server changes oops. I roll back the changes I made, hit cmd-R, and oh noes, it is still broken. But I relax thinking, there must be something held in safari's cache so I press the handy 'Empty Cache' button. Hit cmd-R for refresh it is still broken. I'm really worried that I've done it and broken something bigtime. But first decide to check on a hand win xp computer, and voila it works. So the question is how do you "really" clear the cache w/o restart safari, I have many browser windows open a restart every time I make a server side change will ruin me. Any suggestions? Thanks!

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• Does a bad Internet connection increase bandwidth usage?

  - by Synetech

  My (Rogers) cable connection has been pretty bad recently (channels 3 and 10 are particularly fuzzy—it’s analog, not digital cable). Not surprisingly, this has caused my cable modem to drop out and have to reestablish a connection a couple of times since it started. The poor connection of course means higher corruption (not necessarily dropped per se) which causes the TCP/IP stack to have to retransmit packets more often. Reduction of bandwidth throughput aside, I got to wondering if it increases the actual bandwidth usage. That is, if there is a high error rate on the line causing packets to have to be retransmitted: Does this increase a bandwidth monitoring program’s numbers? Does the ISP count the retransmitted packets toward the monthly cap? Based on what I remember from my university networking courses and common sense, I have a feeling that the answer to both questions is yes, but I cannot reliably measure the first, and have no authoritative answer for the second. I’m wondering if maybe the retransmitted packets are acknowledged as being duplicates and thus not counted somewhere along the line.

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• apache requests failing

  - by Josh

  I'm trying to figure out why sometimes the client fails to load objects/requests from a dynamic page served from Apache/MySql/Debian machine. Let's say 13 objects are to be loaded for a total of 185.3 KB load, with no external objects (no DNS lookups) and no other traffic at the same time, randomly some of those object do not load. However, if I perform a refresh, sometimes all of them load or some might fail again. I only have 1Mbps/up and my DNS is been hosted externally (everydns). What could be the reason of this issue? Any comments will be appreciated.

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• Session persistence between multiple Rails / Unicorn servers with Redis as session_store on AWS

  - by d_ethier

  I've got 2 nginx EC2 instances pointing to 2 Unicorn EC2 instances in a round robin load balanced configuration. The two nginx instances are being the Elastic Load Balancer. Both Unicorn instances have a Redis session_store configured which is in a master/slave configuration with an Elastic IP attached to the master. I've tried configuring the session stickiness on the load balancer, but sessions are lost on each page refresh. I'm using the redis-store gem for the session_store configuration and redis support. Anyone have any ideas as to why this is not working?

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• I'm using a compatible active DisplayPort to DVI adapter with EyeFinity, why does my monitor still flicker?

  - by Christopher Galpin

  I specifically chose an active DisplayPort <- DVI adapter for use with EyeFinity right out of my graphic card vendor's list of confirmed compatible adapters. Yet the screen fails horribly, it blinks on and off constantly, sometimes the graphics go screwy and the appropriate resolutions won't be available. Sometimes the resolution will be available but I'll discover it's only with interlaced refresh rates and bounces up and down. I have to switch the resolution back and forth, again and again, to get it to work correctly, and then it fails again and the process must be repeated the moment the monitor is turned off or I reboot. It's maddening. What is wrong? Is my GFX card supplying insufficient voltage? (Firmware tweaks allegedly help some people, but my card's isn't modifiable.) Could the adapter be defective? Is it not "active" enough for my card and I need an expensive powered adapter? Is this endemic to DisplayPort in general?

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• Block IPs if they access a resource

  - by Victor Oliva

  I own a server that it's costantly being attacked by scripts (that try to access to phpMyAdmin's setup file's and stuff like this). I've heard that many people get this kinds of attacks, but I'm starting to worry since they are getting more common (last month I got 2 attacks, and on november 7th there are 3 attempts already (1st, 4th and 6th of nov). I'm not really concerned about it, since I don't have any database. All the info i have on that server is absolutely public, but I'm worried about that attacking-rate increase. So I thought I could -temporarily- block the IPs that come from those attackers, or something that could make my server ignore requests that ask for phpMyAdmin, pma, xamp, etc. Is there something like that? my server is Linux+Apache+Php

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• Kindle for PC - page loading problems

  - by Andrew Heath

  When viewing books in Kindle for PC, often going to the next page will change the line count at the bottom of the screen but not refresh the page view. Then, if you hit next again, you end up on the next next page (+2 rather than +1). This happens to me going backwards as well. Using arrow keys, or mouse clicks, or page down/up all creates this error. There doesn't seem to be any pattern to the occurrence other than "frequently". It happens on my Win7 64 bit and Win XP machines. I've only one Kindle book at the moment, PHP Object-Oriented Solutions by David Powers, so I suppose it could be a problem specific to that book. Does anyone else have this issue? It is extremely irritating to be constantly flipping back and forth just to get the page view to show the proper page.

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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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• Excel chart won't update, based on calculated cells

  - by samJL

  I have an Excel document (2007) with a chart (Clustered Column) that gets its Data Series from cells containing calculated values The calculated values never change directly, but only as a result of other cells in the sheet changing When I change other cells in the sheet, the Data Series cells are recalculated, and show new values - but the Chart based on this Data Series refuses to update automatically I can get the Chart to update by saving/closing, or toggling one of the settings (such as reversing x/y axis and then putting it back), or by re-selecting the Data Series Every solution I have found online doesn't work - I have Calculation set to automatic - Ctrl+Alt+F9 updates everything fine, EXCEPT the chart - I have recreated the chart several times, and on different computers - I have tried VBA scripts like: Application.Calculate Application.CalculateFull Application.CalculateFullRebuild ActiveWorkbook.RefreshAll DoEvents None of these update or refresh the chart I do notice that if I type over my Data Series, actual numbers instead of calculations, it will update the chart - it's as if Excel doesn't want to recognize changes in the calculations Has anyone experienced this before or know what I might do to fix the problem? Thank you

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• Re-downloading accidentally deleted podcasts in iTunes

  - by Matt

  I deleted some previously deleted podcast episodes in iTunes 9 and I'd like to re-download them. (I don't want to manually re-download them because then they won't show up in the podcast's list in the iTunes Podcast section.) I've read http://blog.krisgielen.be/archives/54 as well as Way to get old podcasts in iTunes where the suggestion is to delete the iTunes entries for the podcasts I'd like to recover, then hold shift while re-opening that podcast's little triangle icon. Here's the problem though: holding shift and re-opening the triangle tells iTunes to refresh the RSS feed, and it's possible that the RSS feed no longer contains the item you want. What I'm really looking for is a means of getting the "Get" button (that normally appears on un-downloaded podcasts) to reappear on the episodes I've previously downloaded but deleted.

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• CentOS - Yum doesn't update anymore?

  - by Xanathos

  I've been trying to use yum now, but for some reason, not even the search work anymore. I even tried putting packages I already downloaded in the search criteria and is the same. [root@AMDFX03 Downloads]# yum search glibc Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile epel/metalink | 22 kB 00:00 * base: centos.secrel.com.br * epel: archive.linux.duke.edu * extras: centos.secrel.com.br * rpmforge: apt.sw.be * updates: centos.secrel.com.br adobe-linux-x86_64/primary | 1.2 kB 00:00 http://linuxdownload.adobe.com/linux/x86_64/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum Trying other mirror. Error: failure: repodata/primary.xml.gz from adobe-linux-x86_64: [Errno 256] No more mirrors to try. This error always appear no matter what I do. Please, can you tell me how to fix this, or at least how to reset yum's configuration?

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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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• 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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• Yum through http proxy

  - by eodchop

  Hello, I have several Fedora 13 servers that have to connect through an http proxy for yum updates. All port 80 traffic has to be routed through this proxy. I have setup the proxy server in the network settings GUI. I can browse the internet just fine. I have also setup my proxy information in /etc/yum.conf as follows: proxy=http:proxy.largecorp.corp/accelerated_pac_base.pac proxy_user=user proxy_password=password I then added the export HTTP_PROXY="http:proxy.largecorp.corp/accelerated_pac_base.pac" to /etc/bashrc and sourced the file. When i run yum update: Loaded plugins:presto, refresh-packagekit Error: Cannot retrieve repository metadata (repomd.xml) fro repository: fedora. Please verify its path and try again. All of the repo urls are the defaults, as this is a fresh install.

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• I need a way to read feeds that meets the following requirements

  - by Daddy Warbox

  Requirements: Can be overlaid over other windows. Can be moved and resized freely. Adjustable refresh times and/or a reload button. Text-only is fine. I will need to open hyper links, though. Simple and cheap free. Offline caching. If you know of a program that does all of this, can you tell me what settings I need to adjust to get it to do this? Thanks in advance.

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• Avoid cache overflow in Atempo LiveBackup

  - by Vebjorn Ljosa

  When attempting the initial backup of a new client, Atempo LiveBackup seems to require a very large cache. For instance, a 20 GB cache is not enough to back up a computer that has 100 GB of data. It appears that LiveBackup is adding new files to the cache at a faster rate than it can send them to the server. When the cache fills up, the backup fails. Aside from removing most data from the computer and then add them back gradually after the initial backup, is there a good workaround? Is it possible to make LiveBackup slow down its scan so as to not fill the cache? Or is it possible to place the cache on an external drive?

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• Why is one specific file not showing up in my document library?

  - by Jay Bazuzi

  In my "Documents" library on Windows 7, one file is not showing up in Windows Explorer. When I look in C:\Users\%USERNAME%\Documents\blah\blah all 24 files appear. But when I look in Libraries > Documents > blah > blah only 23 show up. I made a copy of the file and the copy appears. Refresh doesn't help. The "Arrange by" setting defaults to "Name". When I change it to "Folder" the extra file appears, but changing it back to "Name" the file disappears again. How can I make the file appear in all views? Why would it disappear? EDIT: I deleted the Windows Search Index and things seem to be working again. I say it's a bug in the Search Service.

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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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