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• How do you manage perl modules on a Debian system?

  - by nagul

  I'd like to know if you have a method for managing perl modules on your Debian system, with respect to the following: Installing new modules Listing of manually installed modules Checking dependencies, and uninstalling modules I have looked at this perlmonks article for background reading: What is the best way to install CPAN modules on Debian? I have previously installed perl modules using the CPAN module. I have also used dh-make-perl in some cases, when following instructions to build other packages that had perl dependencies. I'd like to institute a coherent policy on my machine so I can better manage how and where the modules are installed, and reduce the chance of breaking perl on my system. I would strongly like a system where I can detect and uninstall modules that are no longer being used.

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• Memory consumption of each accept() call on server running on Windows 2008 [migrated]

  - by Atul

  I've written a simple and small server application on Windows 2008 that just accepts connections and does nothing else. I am doing memory footprint assessment of socket calls, What I found that each connection (after accept()) consumes at least 2.5 KB of memory. Interestingly, the memory is not consumed by the process that has accept() call but it consumed by a OS process. I believe it might be because of data structures being created inside OS for each connection. Now, I have two key questions: Is it possible by any means to reduce this memory footprint (by changing any parameters, configuration etc) ? If yes how ? (Because 2K for each connection would be too much if we planning server to accept millions of connections) If my server is intended to accept million connections, is it good idea to use Windows 2008 ? or shall I switch to some other OS? Please advice me.

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• 2 HP Procurve 4000M switches and Comcast SMC Gateway

  - by Cole Tierney

  We've got 2 HP Procurve 4000M switches joined by a trunk. Switch 1 is connected to a Cisco 2600 router which is connected to a T1. Internet traffic for hosts on switch 2 must pass through the trunk to switch 1. We're now switching to Comcast who's given us 4 port SMC router. I would like to connect each switch to the comcast router to reduce traffic on the trunk, but I don't want to create a loop. The switches support spanning tree protocol, but I don't know how this would work with the comcast router. Would a triangle network like this work? Thanks for any tips.

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• baffling stat pauses - (reiserfs)

  - by Twirrim

  I've got a SuSE server with reiserfs formatted partitions, all on a RAID1 mirror. I'm noticing odd spikes in iowait, but generally all seems okay. iostat claims not even 3% iowait in general: avg-cpu: %user %nice %system %iowait %steal %idle 6.53 0.03 1.45 2.92 0.00 89.07 After tracking down some odd behaviour when ls'ing, it appears "stat" (ls is aliased to include color which does a stat process on each file) randomly takes 5 seconds on a file in the directory. ReiserFS does a file system sync every 5 seconds, but that's interval between not length of time taken to sync. Out of curiosity I did remount using noatime to see if that would help though as it would reduce sync's workload, but no joy. Anyone got any thoughts what might be causing this pause? Disks appear healthy, RAID controller believes the RAID is healthy, and io stats show the disks aren't working very hard at all.

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• How can I keep my keyboard clean?

  - by Billy ONeal

  I know there are lots of articles out there on getting a keyboard clean, but I'd like to prevent my keyboard from getting nasty in the first place. The biggest problem isn't anything like food particles or liquids -- my keyboards almost instantly get a coating of finger oils and dead skin cells around the edges of the keys where my fingers rest, and the result is quite nasty. I have to clean my keyboards constantly to keep the problem in check. I'm wondering if there are any good ways to reduce this kind of buildup on my keyboard.

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• XBMC DVB-T and Played Video filling screen

  - by Tubs

  I have a small PC running as an XBMC attached to a Samsung le37m87bd. The PC isn't powerful enough to output a full HD 1080 image at 1920x1080 which is the TVs native resolution (about every 1/2 a second things go extra fast, I assume skipping frames), so I want to reduce this. Annoyingly, the TV does not support any other widescreen resolutions. (720 etc) If I use a a 4:3 image, the TV stretches it to be the 16:9, however, all 16:9 content is stretched sideways as XBMC is sending out a 4:3 image with a 16:9 image inside. Is there anyway I can force XBMC to compensate for this, ie stretch vertically so that black bars are removed, but not stretched horizontally?

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• What are the challenges when my enterprise desires to move the processing component of an applicatio

  - by Berkay

  Assume that i have an enterprise accounting application that consists of a front-end interface, a processing tier, and a back-end database. This is an application that contains private business data, and thus is traditionally run in a secure private network environment within the enterprise. What are the challenges that appear when my enterprise desires to move the processing component of this application to a cloud computing data center in order to achieve greater scalability or to reduce IT costs ? Pls note: do i have to make significant changes to my own infrastructure to enable external access to formerly private resources? do i have to modify the application code to handle new network topology ? thanks, if you give your answers in a simple manner, really appreciated.

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• Linking RSA with Logstash etc

  - by Anuj

  i was wondering whether we can use logstash or any other opn source or free Log management too to collect,index the data and then feed this index into RSA envision or any other enterprise SIEM tool. Will this be beneficial in any way? Also are the indexes of various Log Management and SIEM tools -- splunk,RSA envision,HP Arcsight Logger and Logstash etc compatiable with each other. My organization is planning to buy RSA envision appliance and is there any way to restrict or select only certian type of log files eg: security logs or apache logs .. so that onlt those are monitored and this will reduce the EPS(events per second).

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• Performance affects of compressing Program Files on Windows / NTFS

  - by SRobertJames

  What are the performance affects of compressing Program Files on Windows NTFS? On a fast, multicore machine, the overhead of decompression is minimal. Machines are generally disk bound, and if you can reduce the disk load by compression, you often speed things up. (Microsoft says that the built in compression of Windows Search indexes actually improves speed for this reason.) On the other hand, Windows' virtual memory is complicated. Perhaps if files are compressed, they can't be paged out simply. And there may be other issues. In short: On a fast, multicore machine with a relatively slow disk, what performance affects will compressing Program Files have?

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• Get IP network range after reverse DNS?

  - by Max

  For analytics purposes, I'm looking at large sets of IP addresses in server log files. I'm trying to perform reverse-DNS lookups to understand where traffic is coming from - e.g. what percentage of IPs resolve to corporations, schools, government, international etc. Despite a bunch of optimizations, individually reverse-DNS'ing every IP address still appears to be fairly expensive though. So - is there any way to obtain an entire range of IPs from a reverse-DNS? If yes, this could greatly reduce the number of actual reverse-DNS lookups. Example (numbers slightly obfuscated): Log file contains a request from an IP 128.151.162.17 Reverse DNS resolves to 11.142.152.128.in-addr.arpa 21599 IN PTR alamo.ceas.rochester.edu (So this is a visitor from Rochester University, rochester.edu) Now, would it be safe to assume that all at least all IPs from 128.151.162.* will also resolve to rochester.edu? What about 128.151.*.*? Is there a way to get the exact IP range?

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• Saving music wisely: Why save 'Queen - Bohemian Rhapsody.mp3' millions of times?

  - by hsmit

  As far as I'm concerned, Queen's song 'bohemian rhapsody' is one of the most popular songs all time. But for the purpose of this message you may replace this with another track. At the same time I think 60% of the digital-music listeners have this track. Sometimes we have multiple copies: different versions of the track, different devices, unwanted duplicates in download folders, itunes folders etc.. Wouldn't it be much smarter to store these songs only once? You can imagine various solutions for this. How would you accomplish this? Some criteria that may help you find an answer: It must reduce disk space It must remember which music belongs to you (DRM) It must use network traffic efficiently

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• Install VLC 2.0.7 in CentOS 6.4?

  - by raaz

  I am keep failing in the installation process I have tried. I have started process as follows. yum install gcc dbus-glib-devel* lua-devel* libcddb wget http://download.videolan.org/pub/videolan/vlc/2.0.7/vlc-2.0.7.tar.xz tar -xf vlc-2.0.7.tar.xz && cd vlc-2.0.7 ./configure in the configure I am getting the error as follows configure: WARNING: No package 'libcddb' found: CDDB access disabled. checking for Linux DVB version 5... yes checking for DVBPSI... no checking gme/gme.h usability... no checking gme/gme.h presence... no checking for gme/gme.h... no checking for SID... no configure: WARNING: No package 'libsidplay2' found (required for sid). checking for OGG... no configure: WARNING: Library ogg >= 1.0 needed for ogg was not found checking for MUX_OGG... no configure: WARNING: Library ogg >= 1.0 needed for mux_ogg was not found checking for SHOUT... no configure: WARNING: Library shout >= 2.1 needed for shout was not found checking ebml/EbmlVersion.h usability... no checking ebml/EbmlVersion.h presence... no checking for ebml/EbmlVersion.h... no checking for LIBMODPLUG... no configure: WARNING: No package 'libmodplug' found No package 'libmodplug' found. checking mpc/mpcdec.h usability... no checking mpc/mpcdec.h presence... no checking for mpc/mpcdec.h... no checking mpcdec/mpcdec.h usability... no checking mpcdec/mpcdec.h presence... no checking for mpcdec/mpcdec.h... no checking for libcrystalhd/libcrystalhd_if.h... no checking mad.h usability... no checking mad.h presence... no checking for mad.h... no configure: error: Could not find libmad on your system: you may get it from http://www.underbit.com/products/mad/. Alternatively you can use --disable-mad to disable the mad plugin. [root@localhost vlc-2.0.7]# So I went to libmad http location and downloaded it and while doing make it gave me the errors.There are no errors at ./configure with libmad but make not going through. [root@localhost libmad-0.15.0b]# make (sed -e '1s|.*|/*|' -e '1b' -e '$s|.*| */|' -e '$b' \ -e 's/^.*/ *&/' ./COPYRIGHT; echo; \ echo "# ifdef __cplusplus"; \ echo 'extern "C" {'; \ echo "# endif"; echo; \ if [ ".-DFPM_INTEL" != "." ]; then \ echo ".-DFPM_INTEL" | sed -e 's|^\.-D|# define |'; echo; \ fi; \ sed -ne 's/^# *define *\(HAVE_.*_ASM\).*/# define \1/p' \ config.h; echo; \ sed -ne 's/^# *define *OPT_\(SPEED\|ACCURACY\).*/# define OPT_\1/p' \ config.h; echo; \ sed -ne 's/^# *define *\(SIZEOF_.*\)/# define \1/p' \ config.h; echo; \ for header in version.h fixed.h bit.h timer.h stream.h frame.h synth.h decoder.h; do \ echo; \ sed -n -f ./mad.h.sed ./$header; \ done; echo; \ echo "# ifdef __cplusplus"; \ echo '}'; \ echo "# endif") >mad.h make all-recursive make[1]: Entering directory `/home/raja/Downloads/libmad-0.15.0b' make[2]: Entering directory `/home/raja/Downloads/libmad-0.15.0b' if /bin/sh ./libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I. -DFPM_INTEL -DASO_ZEROCHECK -Wall -march=i486 -g -O -fforce-mem -fforce-addr -fthread-jumps -fcse-follow-jumps -fcse-skip-blocks -fexpensive-optimizations -fregmove -fschedule-insns2 -fstrength-reduce -MT version.lo -MD -MP -MF ".deps/version.Tpo" \ -c -o version.lo `test -f 'version.c' || echo './'`version.c; \ then mv -f ".deps/version.Tpo" ".deps/version.Plo"; \ else rm -f ".deps/version.Tpo"; exit 1; \ fi mkdir .libs gcc -DHAVE_CONFIG_H -I. -I. -I. -DFPM_INTEL -DASO_ZEROCHECK -Wall -march=i486 -g -O -fforce-mem -fforce-addr -fthread-jumps -fcse-follow-jumps -fcse-skip-blocks -fexpensive-optimizations -fregmove -fschedule-insns2 -fstrength-reduce -MT version.lo -MD -MP -MF .deps/version.Tpo -c version.c -fPIC -DPIC -o .libs/version.lo cc1: error: unrecognized command line option "-fforce-mem" make[2]: *** [version.lo] Error 1 make[2]: Leaving directory `/home/raja/Downloads/libmad-0.15.0b' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/raja/Downloads/libmad-0.15.0b' make: *** [all] Error 2 how can i resolve the issue and install VLC in my Centos ? I am using CentOS 6.4 . Thank you.

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• MySQL slave server not removing old relay binlogs

  - by MKzero

  I have a MySQL server with slave replication on another host. Today I stumbled across the high disk usage of the slave host and invastigated what takes up all the space. As it turns out this space is occupied by the slaves relay logs. I tried to turn the expire_logs_days variable down and restarted the MySQL daemon but the reported disk space stays the same. I could't really find anything exept that FLUSH LOGS should clear old logs. I tried that with no result. Is there any way I can reduce the disk space that the relay logs take?

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• How to manage iowait over cifs?

  - by Silvia

  For backup purposes we have Cifs file Server running that contains encrypted containers for backing up the more sensitive data. The container is mounted with cryptsetup and loop as a local filesystem and the rsync is used for backups. Because the Cifs server is not the fastest machine ever built, running the rsync process results in an iowait on the servers running the backup which in turn drives Nagios into an email frenzy. The question is, how do reduce the iowait on the server? Configuring Nagios to not report seems more like a workaround then a solution. Stretching the backups over different time intervals is already done with little effect and spending money is also not an option because apparently, we are talking about a "non-critical system".

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• Can I optimize this mod_wsgi / apache file better?

  - by tomwolber

  Hi! I am new to Django/Python/ mod_wsgi, and I was wondering if I could optimize this file to reduce memory usage: ServerRoot "/home/<foo>/webapps/django_wsgi/apache2" LoadModule dir_module modules/mod_dir.so LoadModule env_module modules/mod_env.so LoadModule log_config_module modules/mod_log_config.so LoadModule mime_module modules/mod_mime.so LoadModule rewrite_module modules/mod_rewrite.so LoadModule setenvif_module modules/mod_setenvif.so LoadModule wsgi_module modules/mod_wsgi.so LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined CustomLog /home/<foo>/logs/user/access_django_wsgi.log combined ErrorLog /home/<foo>/logs/user/error_django_wsgi.log KeepAlive Off Listen 12345 MaxSpareThreads 3 MinSpareThreads 1 MaxClients 5 MaxRequestsPerChild 300 ServerLimit 4 HostnameLookups Off SetEnvIf X-Forwarded-SSL on HTTPS=1 ThreadsPerChild 5 WSGIDaemonProcess django_wsgi processes=5 python-path=/home/<foo>/webapps/django_wsgi:/home/<foo>/webapps/django_wsgi/lib/python2.6 threads=1 WSGIPythonPath /home/<foo>/webapps/django_wsgi:/home/<foo>/webapps/django_wsgi/lib/python2.6 WSGIScriptAlias /auctions /home/<foo>/webapps/django_wsgi/auctions.wsgi WSGIScriptAlias /achievers /home/<foo>/webapps/django_wsgi/achievers.wsgi

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly. edit To be clear, the question isn't just about "abnormal" latency, but about latency in general. Additionally, it is specifically about TCP/IP-over-Ethernet and not about other protocols (even if they have better latency characteristics.)

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• resize image without image quality reduction

  - by ali

  In web design , it's usually needed to design an image for example in Photoshop and then use multiple sizes of it. but I don't understand something here : When I resize the image (PNG or JPG) and reduce the dimensions of that in Photoshop , the image quality extremely gets reduced and the edges become messy while resizing the image in a simple software like Microsoft Paint gives a really better output! So what's the reason ? Is there a trick in Photoshop for image resizing which I've missed? Thanks for your help. UPDATE: I resize in this way : image image size , then enter new dimensions , all of checkboxes are checked , and have tried all of resample modes including Bicubic sharper

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• Very Large number of connections in TIME_WAIT state; Server is slow, ipconntrac

  - by Sparsh Gupta

  I have a nginx server with load balancing and reverse proxy. Right now its behing another nginx but very soon I plan to make it front, where it will receive TCP connections from clients directly at a rate of 500req/second I am having some big troubles with the server. I have pasted my configurations here and I am kinda sure that the problem is with ipconntrac and similar things which are alient to me http://paste.org/pastebin/view/28543 root@load_balancer:/proc/sys/net/ipv4# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c 67 CLOSING 727 ESTABLISHED 173 FIN_WAIT1 183 FIN_WAIT2 19 LAST_ACK 5 LISTEN 447 SYN_RECV 1 SYN_SENT 27970 TIME_WAIT Its a ubuntu machine with mainly nginx (load balancer and reverse proxy) installed. It surely isnt great. Can you help me understand whats going on and how can I fix it. This is my live server and I am sure its in a bad shape right now. Any document or commands to fix this, or settings I should make to make this better and reduce time wait and fin_wait1/2 better would be awesome.

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• Touchpad stops working when plugging in new laptop PSU

  - by drahcir

  I recently bought a psu for my Compaq 6710b and when I plug it in to the laptop the touchpad seems to go stop working, especially when the laptop is charging. I checkout this site and it suggests that the problem might be static electricity building up due to poor earthing.I tried replacing the cable that leads from the psu to the wall socket with the one I had of my old psu but to no avail. I even tried to see if I put the psu farther away might reduce to interference but also resulted in failure. Any ideas on how I could solve this problem?

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• SMTP server problem

  - by ram

  Hi, Our requirement is to send weekly newsletters to our website customers. For which we wanted to have local hosted SMTP server in our office. We are not using SMTP server provided by website hosting provider, as we wanted to reduce the network traffic and avoid IP blocking due to bulk mails. We are sending newsletters on weekly basis from our local SMTP server. But due to some reasons, some emails are going to spam and some are not reaching to customers and sometimes there are bounce messages to follow bulk email guidelines (mainly from Gmail). Can you please suggest me, how to achieve my problem. I also wanted to know what type of technology generally Linkedin or banks uses to send notifications emails to all its customers. When they send bulk emails, they will always reach inbox with out any problem. I want the same solution to implement for my website. Please suggest me. Thank you very much in advance.

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• Best solution for High Availability and SSRS on SQL Server 2008 R2?

  - by Chandra

  I have 2 Physical Servers with SQL Server 2008 R2. – SQL Server 1(Active) & SQL Server 2 (Passive) Web Application is developed using .Net 4.0 Framework. I want to know the best solution to have high availability and also have SSRS for reporting. Planned solution: Mirroring for Failover, and Transaction Replication for SSRS as the mirrored database can only be used for failover scenarios. SSRS will be on the Passive server, to reduce the load on the Active server. Let me know if the solution is correct. Also suggest alternate approaches.

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• Using WebSphere CloudBurst with PowerVM to AIX virtualization over a cloud

  - by ADD Geek

  hi there we are studying the virtualization option to reduce our datacenter cost, and this research was assigned to me. we looked into alternatives and we almost reached a conclusion that PowerVM is the only option to virtualize pSeries servers. we found no signs of cloud support explicitly mentioned in any document, however there was the mention of CloudBurst. from the videos we watched and the documents we read, it seems that CloudBurst is more oriented towards Application Servers (WebSphere Software). but our environment is not relying only on WebSphere. we have some banking applications, Oracle Databases and MQ/Broaker. the question is: 1- can we virtualize the existing applications (all running AIX) on a cloud running on top of some of the existing servers? (given that we do the sizing properly) 2- is PowerVM to run on top of CloudBurst? 3- if the above solution is applicable, is this some sort of HA solution (since the VM will run on top of multiple physical boxes, while the same physical box will run multiple live images) thanks for your help

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• PostgreSQL 9: Does Vacuuming a table on the primary replicate on the mirror?

  - by Scott Herbert

  Running PostgreSQL 9.0.1, with streaming replication keeping one read-only mirror instance up to date. Auto-vaccuum is on on the primary, except for a few tables which are not vacuumed by the auto-vacuum daemon, in an effort to reduce business-hour IO. These tables are "materialised views". Each night at midnight, we run a vacuum across the database in order to clean up those tables that are excluded from the auto-vacuum. I'm wondering if that process replicates across to the mirror, or if I need to set up vacuum on the mirror as well?

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• How do I delay email delivery using Entourage 2008 with Exchange, e.g. using the X.400 Deferred-Delivery header?

  - by Matt McClure

  I'd like to delay the delivery of email that I send so that I can time delivery when the recipient is unlikely to be reading email and I can reduce the likelihood of getting into a chat-like conversation. I'm using Entourage 2008 and Exchange hosted by Rackspace. I tried naively adding a Deferred-Delivery header after reading http://www.faqs.org/rfcs/rfc2156.html and www.itu.int/rec/T-REC-F.400-199906-I/en , but my mail was delivered immediately. Ideally the delay would occur on the MTA instead of my MUA so that delivery would still occur even if my laptop were disconnected from the network at the delivery time I specify. My best workaround at the moment is to habitually use Entourage's Send Later button when composing mail and then click Send/Receive at the end of the day. This is less than ideal because recipients are often reading mail at the end of my day, and I often get immediate replies. Matt

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• SQL Server Replication Agent priority

  - by Wikser

  Every hour a server replicates SQL server data with some external web server. During this time, which takes about 2-5minutes, the database seriously slows down. Colleagues, which work with the front end applications of that on another terminal server, even regularly start complaining. The databases are also synchroniously mirrored (via SQLServer mirroring, no replication) to a third server. Note that 99% of the data is replicated outgoing, so the server should rarely need to update its data. As the (merge and transactional) replication tasks are not time-critical, I would like to reduce their priority or somehow slow them down, so they don't affect the database performance that much. How would you implement that?

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