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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• Confused about the Windows 7 Preinstallation Kit

  - by David Brown

  I build custom PCs and would like to use the Windows 7 Preinstallation Kit to make installation go a little quicker and customize the Windows image. However, since each PC is built to a particular customer's specifications, the hardware will rarely be the same. So, I would like to have a single answer file that will work for everything. I'm not sure if that's possible, however. What I mostly want to do for now is add my support information as well as pre-set anything that I would normally change after each installation completes. I have a Windows 7 Professional Upgrade DVD set (both 32-bit and 64-bit), but no OEM disks. I copied the Install.wim file to my local drive and opened it in the Windows System Image Manager, but it asks me to choose a catalog file specifically for each edition of Windows 7. Will this limit the answer file to whichever edition I choose? I would think choosing Starter would give me the most basic settings, which would apply to all other editions, but I'm not entirely sure of this. I don't intend to install any extra applications or drivers. I merely want to insert an OEM disk, my OPK USB drive, and have it work for whatever edition of Windows 7 I'm installing. If a large number of similarly-configured PCs need to be built, I'll go ahead and create a custom answer file in that case, but for a single machine order, that seems like overkill. In addition, do I need a separate answer file for 32-bit and 64-bit versions of Windows 7? Or will it work for both, even though I copied the Install.wim file from the 32-bit disk? Thanks!

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• Best CPUs for speeding up compiling times of C++ w/ DistGCC

  - by Jay

  I'm putting together a distributed build farm with DistGCC to speed up our teams compile times and just looking for thoughts on which processors to use in the hosts. Are we going to get a noticeable decrease in time using 8 cores vs. 4-hyperthreaded cores? Big difference in time between i7 and Xeon? etc, etc. Just need advice from people who've put together kick-a build clusters. We've got a majority of the normal things to speed up builds in place (pre-compiled headers, ccache, local gigabit connections between them, tons of ram, etc) so please just give advice on the best processor to use. And money is a factor, but anythings doable if the performance increase is noticeable. Thanks. Jay EDIT: Although any advice IS welcome, please refrain from "Do this first" posts as we're not planning on skimping on things like SSD, maxed out RAM, etc. My personal system is a iMac Quad-core i5 with 8GB of RAM. When I build our project locally, my processor floats around 99-100% a majority of the time, which makes me assume it is a bottleneck, even if you made everything else faster. My ram on the other hand doesn't even get close to maxing out. It's also worth noting that I did research this, however every discussion I could find was primarily for gaming machines, which is obviously a different beast in usage. These machines won't even have monitors or anything but integrated graphics since they have one purpose: Build freakin fast. (hopefully)

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• Issue resolving names on Hyper-V guest with Routing and Remote Access

  - by John Sheehan

  I've got a Win2k8 standard server running Hyper-V with a Server 2003 web guest instance running. The host is publicly available on the internet. I've created an Internal Private network in the Hyper-V Virtual Network manager. I've set the host IP for that virtual adapter to 192.168.0.1. I've set the IP on the guest to 192.168.0.2. They can ping each other and share files. I can't browse the web on the guest though. NSLOOKUPs are working. I've tried setting the DNS server setting on the guest to 192.168.0.1 and something external like Google's 8.8.8.8 server to no avail. Windows firewall is disabled on the internal virtual network. I've tried it with both DNS installed on the host and without it. I'm not sure which RRAS/NAT settings are relevant to pass on so ask if you need me to clarify anything. How do I get outbound internet working on the guest VM?

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• Windows 7 Multi-NIC woes

  - by Eric

  I have Comcast business Internet here. It gives me 5 static IPs. Most of the machines in my house connect to a router like every other household. It has a 192.168.117.x subnet, DHCP Server, etc. and all is well. However, I have a second machine on MY desk that has a life Internet IP. Up until yesterday, this machine was running XP Pro. The primary NIC was manually set to 192.168.117.241 with no gateway, and the secondary NIC was manually set to 173.x.x.171 with a gateway of 173.x.x.174. This worked just fine for years. Yesterday I replaced that XP machine with a brand new Windows 7 x64 box. Again, I configured it the same way. The onboard NIC was given a static 192.168.117.x address with no gateway, and the secondary NIC was given a live Internet IP address with the proper router, etc. 2 Problems. First is that the internal network (192.168.117.x) is listed as a public network because there's no gateway, so that means no homegroup, no file sharing, none of that. And I can't change it from what I'm reading... The second is that the machine reports the "router" ip address as it's address, and not the address that it's supposed to. I'm ready to tear my hair out over this. Any ideas?

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• RAID 5 Install on Ubuntu Server 12.04 [closed]

  - by tarabyte

  Environment: Ubuntu Server 12.04, installing from bootable flash drive Error: No root file system is defined. Please correct this from the partitioning menu. I'm trying to set up a personal file server with software RAID 5. I just got three hard drives for this, but haven't found any solid documentation. I'm unsure what the basic way to partition my hard drives is. Can someone upload a screenshot of their "partition disks" screen so that I can compare with mine (attached)? Should I set the bootable flag? Do I need a /home partition? A /boot partition? Should I "Use [my partition] as: Ext4 journaling file system"? Or make that field "physical volume for RAID"? I am an engineer, but I have only a cursory knowledge of all-things-linux. If you know of any good learning resources I'd be happy to hear about those too (that way I don't have to blindly follow deprecated tutorials online). well, image would be here but i don't have a high enough reputation yet (please vote up :)) Thank you, References I've looked into: https://help.ubuntu.com/community/Installation/SoftwareRAID https://help.ubuntu.com/12.04/serverguide/advanced-installation.html http://forevergeeks.com/setup-ubuntu-server-with-raid-5/

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• MOSS2007 tries to use ActiveDirectory when I have configured an alternative membership provider

  - by glenatron

  I've got a MOSS site that I am trying to configure using Forms authentication and absolutely any kind of membership provider whatsoever. Thus far ActiveDirectory has proved obstructively difficult so I've just whipped up a simple stub membership provider and put it in the GAC. It's a very basic and simple provider but it works fine with an ASP.Net site, I just can't make it work with Sharepoint. On Sharepoint I get the following error when I look for StubProvider:Bob ( or anything else for that matter) from the "Policy For Web Application" people picker: Error in searching user 'StubProvider:bob' : System.ComponentModel.Win32Exception: Unable to contact the global catalog server at Microsoft.SharePoint.Utilities.SPActiveDirectoryDomain.GetDirectorySearcher() at Microsoft.SharePoint.WebControls.PeopleEditor.SearchFromGC(SPActiveDirectoryDomain domain, String strFilter, String[] rgstrProp, Int32 nTimeout, Int32 nSizeLimit, SPUserCollection spUsers, ArrayList& rgResults) at Microsoft.SharePoint.Utilities.SPUserUtility.SearchAgainstAD(String input, SPActiveDirectoryDomain domainController, SPPrincipalType scopes, SPUserCollection usersContainer, Int32 maxCount, String customQuery, TimeSpan searchTimeout, Boolean& reachMaxCount) at Microsoft.SharePoint.Utilities.SPActiveDirectoryPrincipalResolver.SearchPrincipals(String input, SPPrincipalType scopes, SPPrincipalSource sources, SPUserCollection usersContainer, Int32 maxCount, Boolean& reachMaxCount) at Microsoft.SharePoint.Utilities.SPUtility.SearchPrincipalFromResolvers(List`1 resolvers, String input, SPPrincipalType scopes, SPPrincipalSource sources, SPUserCollection usersContainer, Int32 maxCount, Boolean& reachMaxCount, Dictionary`2 usersDict). The Provider is named as Authentication Provider for the Site Collection in question. As far as I can tell this is because Sharepoint is still trying to access ActiveDirectory rather than talking to the provider I'm asking it to use. My Sharepoint Central Administration section includes this: <membership> <providers> <add name="StubProvider" type="StubMembershipProvider.Provider, StubMembershipProvider, Version=1.0.0.0, Culture=neutral, PublicKeyToken=5bd7e2498c3e1a03" /> </providers> </membership> And also: <PeoplePickerWildcards> <clear /> <add key="StubProvider" value="%" /> </PeoplePickerWildcards> Is there a clear reason why this would not be accessible from the PeoplePicker or why it is still trying to use ActiveDirectory? I've made sure I reset IIS and even restarted the server to see if either of those helped but they made no difference.

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• Why my hard disk can't boot from the BIOS?

  - by Mario

  I installed a new sata DVD burner. When I turned on the machine (windows 7) it didn't boot. It can boot from a lubuntu CD. There is an option on lubuntu to boot form the first hard disk. If I select it, the machine boots normally to windows 7. So from the CD I can boot but not from the BIOS. I checked all the options more than once: boot from HD, not boot from removable, boot from USB, boot from optical. The order of the boot sequence is HD then DVD. I tried booting only with the HD; I disconnected both DVDs. I even tried recovery of the MBR: bootsect, bootrec, fixmbr, buildbcd, nt60, etc. So, the question is, does this have a reason, what's the difference between booting from the BIOS (as I think) to from the DVD?. The BIOS is intel, it has BIOS codes on the right bottom corner, it stays at 5A for a while. 5A is "Resetting PATA/SATA bus and all devices".

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• PHP/MySQL Performance Testing with Just PHP

  - by Mike Gifford

  I'm trying to diagnose a server where the website is loading very slowly, but unfortunately my client has only provided me with FTP access. I've got FTP access so I can upload PHP scripts, but can't set up any other server side tools. I have access to phpMyAdmin, but not direct access to the MySQL server. It is also unfortunately a Windows server (and we've been a Linux shop for over a decade now). So, if I wan to evaluate MySQL & disk speed performance through PHP on a generic server, what is the best way to do this? There are already tools like: https://github.com/raphaelm/php-benchmark or https://github.com/InfinitySoft/php-benchmark But I'm surprised there isn't something that someone has already set up & configured to just run through and do some basic testing of a server's responsiveness. Every time we evaluate a new server environment it's handy to be able to compare it to an existing one quickly to see if there are any anomalies. I guess I'd just hoped that someone else had written up a script to do this already. I know I have, but that was before Github when there was a handy place to post scraps of code like this. Originally posted in http://stackoverflow.com/questions/12321498/php-mysql-performance-testing-with-just-php but it was recommended that I re-post it here.

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• PostgreSQL lots of large Arrays and Writes

  - by strife911

  Hi, I am running a python program that spawns 8 threads and as each thread launch its own postmaster process via psycopg2. This is to maximize the use of my CPU-cores (8). Each thread call a series of SQL Functions. Most of these functions go through many thousands of rows each associated to a large FLOAT8[] Array (250-300) values by using unnest() and multiplying each FLOAT8 by an another FLOAT8 associated to each row. This Array approach minimized the size of the Indexes and the Tables. The Function ends with an Insert into another Table of a row of the same form (pk INT4, array FLOAT8[]). Some SQL Functions called by python will Update a row of these kind of Tables (with large Arrays). Now I currently have configured PostgreSQL to use most of the memory for cache (effective_cache_size of 57 GB I think) and only a small amount of it for shared memory (1GB I think). First, I was wondering what the difference between Cache and Shared memory was in regards to PostgreSQL (and my application). What I have noticed is that only about 20-40% of my total CPU processing power is used during the most Read intensive parts of the application (Select unnest(array) etc). So secondly, I was wondering what I could do to improve this so that 100% of the CPU is used. Based on my observations, it does not seem to have anything to do with python or its GIL. Thanks

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• Allow access from outside network with dmz and iptables

  - by Ivan

  I'm having a problem with my home network. So my setup is like this: In my Router (using Ubuntu desktop v11.04), I installed squid proxy as my transparent proxy. So I would like to use dyndns to my home network so I could be access my server from the internet, and also I installed CCTV camera and I would like to enable watching it from internet. The problem is I cannot access it from outside the net. I already set DMZ in my modem to my router ip. My first guess is because i'm using iptables to redirect all inside network to use squid. And not allow from outside traffic to my inside network. Here is my iptables script: #!/bin/sh # squid server IP SQUID_SERVER="192.168.5.1" # Interface connected to Internet INTERNET="eth0" # Interface connected to LAN LAN_IN="eth1" # Squid port SQUID_PORT="3128" # Clean old firewall iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X # Load IPTABLES modules for NAT and IP conntrack support modprobe ip_conntrack modprobe ip_conntrack_ftp # For win xp ftp client #modprobe ip_nat_ftp echo 1 > /proc/sys/net/ipv4/ip_forward # Setting default filter policy iptables -P INPUT DROP iptables -P OUTPUT ACCEPT # Unlimited access to loop back iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT # Allow UDP, DNS and Passive FTP iptables -A INPUT -i $INTERNET -m state --state ESTABLISHED,RELATED -j ACCEPT # set this system as a router for Rest of LAN iptables --table nat --append POSTROUTING --out-interface $INTERNET -j MASQUERADE iptables --append FORWARD --in-interface $LAN_IN -j ACCEPT # unlimited access to LAN iptables -A INPUT -i $LAN_IN -j ACCEPT iptables -A OUTPUT -o $LAN_IN -j ACCEPT # DNAT port 80 request comming from LAN systems to squid 3128 ($SQUID_PORT) aka transparent proxy iptables -t nat -A PREROUTING -i $LAN_IN -p tcp --dport 80 -j DNAT --to $SQUID_SERVER:$SQUID_PORT # if it is same system iptables -t nat -A PREROUTING -i $INTERNET -p tcp --dport 80 -j REDIRECT --to-port $SQUID_PORT # DROP everything and Log it iptables -A INPUT -j LOG iptables -A INPUT -j DROP If you know where did I miss, please advice me. Thanks for all your help and I really appreciate it.

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• Updated XAMPP with MySQL, all my tables are missing

  - by user371699

  I just updated XAMPP to a newer version, which included updating MySQL from 5.5 to 5.6. Using phpMyAdmin, however, all of my tables within my databases still appear on the left navigation panel, but the main window shows that all my databases are empty (except for information_schema, and a couple other default tables.) Clicking on a table in the navigation panel gives me a "table doesn't exist" message. It does looks like information_schema.tables doesn't have my tables, either. Can anyone assist me with this? I did make a complete backup of all my databases before the upgrade, but I first want to see if I can fix this the "normal" way. Furthermore, I'm not sure if the MySQL upgrade involved making changes to the information/performance databases, so I don't know if I can restore the old ones. Thank you. EDIT: Continuing my searching, I realized that only the INNODB databases are missing. I've tried running the following with no avail: /opt/lampp/bin $ sudo ./mysql_install_db --basedir=/opt/lampp and /opt/lampp/bin $ sudo ./mysql_install_db --basedir=/opt/lampp --datadir=/opt/lampp/var/mysql The my.cnf file in /opt/lampp/etc contains the following InnoDB settings: innodb_data_home_dir = /opt/lampp/var/mysql/ innodb_data_file_path = ibdata1:10M:autoextend innodb_log_group_home_dir = /opt/lampp/var/mysql/ # You can set .._buffer_pool_size up to 50 - 80 % # of RAM but beware of setting memory usage too high innodb_buffer_pool_size = 16M # Deprecated in 5.6 #innodb_additional_mem_pool_size = 2M # Set .._log_file_size to 25 % of buffer pool size innodb_log_file_size = 5M innodb_log_buffer_size = 8M innodb_flush_log_at_trx_commit = 1 innodb_lock_wait_timeout = 50 What could possibly be wrong? Why is the information_schema not updating correctly? It looks like /opt/lampp/var/mysql has all my tables in it within the database directories, but they're still not showing up in information_schema.

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• Limit bandwith on network of computers

  - by Joseph34123

  We have network in office of approximately 10 computers sometimes when someone downloads something for work (e.g. syncing email with an attachment or Dropbox), everyone slows down. I could limit each computer in office but the problem is that we have an open WiFi network, and I cannot access the computers that use it. We have one main DSL router "Netopia 3347" and another router connected to it on wire for public wifi is "Linksys WRT110". I cannot change the setup we have and don't want to. There's 2 approaches here: Set office computers download limit in each computer and then I need to find out how I can set a download limit for the wifi network such as in the router settings. It's a Linksys router and I did not see the option for this, so maybe I need new router for WiFi? Don't bother with each computer and put some "specific hardware" or another computer before router so all traffic goes trough it and I can then assign priority maximum speed for each IP address. Question is what hardware do I need?

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• Microsoft Web Farm Framework 502 error

  - by hermiod

  My apologies if this is a really stupid question, but I have installed and set up the new Microsoft Web Farm Framework in a UAT environment with a controller machine, a primary, and a secondary server. I have installed one of our in-house applications on to the primary server and it has been successfully provisioned across to the secondary. I have tried accessing the server via the url http:\mis-uat-002\testfarm\reviewer where mis-uat-002 is the name of the farm controller, testfarm is the name of the farm, and reviewer is the name of the application. When using this url I get a "502 - Web server received an invalid response while acting as a gateway or proxy server." error. If I access the application directly via http:\mis-uat-003\reviewer (mis-uat-003 is the primary farm server, reviewer is the application) then it works no problem. Is there some additional set up that needs to be done in order for the farm controller to do its job? It should be noted that this is a UAT environment so is not on a domain of any sort. However, if this was successful and the WFF came out with V1.0 fairly soon, we would be looking to run this on a Windows 2008 domain.

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• Fedora 9 not reconizing hard drive

  - by Andrew Jones

  I am installing Fedora 9 to a PC (specifications at the bottom) and have had a lot of trouble with it recognising the hard drive. To get the Fedora installer to recognize it in the first place I had to pass "ata_generic.all_generic_ide=1 pci=nomsi" to the kernel, after which it installed OK. However, now when I boot the installed OS, I get a "could not find filesystem '/dev/root'" error. I tried passing the same arguments to the kernel at boot as I did when installing but to no avail. I have tried using the default LVM layout and defining manual ones but it made no difference. There is no option in the BIOS to enable AHCI or anything like that, in fact the BIOS is very limited in most respects. I can get into the system by using the installation CD in rescue mode (with those extra kernal parameters) but I'm not sure what to do once in there... Unfortunately using a more recent version of Fedora or even another Linux distribution altogether isn't an option becuase of outside constraints - which is annoying since I know for a fact Ubuntu works fine on this setup. I have not been using Linux that long, so treat me like an idiot - I am one. Any help would be greatly appreciated, thanks! System spec: Intel Atom Z530 CPU @ 1.6 GHz Intel US15W chipset 1 GB DDR2 160 GB SATA harddisk (Samsung HM16HI) 1000 Mbit/s Ethernet port Phoenix BIOS

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• Can't get an IBM xSeries 345 server to load Windows Server 2003 using ServerGuide utility

  - by Kyle Noland

  I have a client that has an IBM xSeries 345 eServer. Per the IBM support website, I have downloaded the ServerGuide Setup 7.4.17 installation ISO and burned a bootable CD. The CD boots fine and loads the utility. I walk through the following screens without any issue: Set the date and Time Detect the IBM ServeRAID card and install the latest firmware Clear the hard disks Set up the RAID array The next step is format the NOS partition. I select my partition size and the utility goes through the following steps: Creating NOS partition Formatting NOS partition (NTFS) Copying W32 files The copying W32 files takes about 10 minutes. I see the CD drive and disks working hard. When the copying is complete, I'm taken to a blank page just NOS Partitioning at the top. At the bottom of the screen are the familiar Back and Exit buttons. I see the place where the Next button should be, and if I click on it I can tell there is something there, but the space is empty. No button is displayed and clicking the empty spot doesn't ever take me to the next screen. I can't load the OS until I get past this part. I have already tried: Burning multiple copies and versions of the ServerGuide CD Letting the final screen just sit there over the weekend thinking it might advance after syncing the drives or something Has anybody else seen this? I'm really at a loss here.

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• Setting Up Apache as a Forward Proxy with Cahcing

  - by Karl

  I am trying to set up Apache as a forward proxy with caching, but it does not seem to be working correctly. Getting Apache working as a forward proxy was no problem, but no matter what I do it is not caching anything, to disk or memory. I already checked to make sure nothing is conflicting in the mods_enabled directory with mod_cache (ended up commenting it all out) and also I tried moving all of the caching related fields to the configuration file for mod_cache. In addition I set up logging for caching requests, but nothing is being written to those logs. Below is my Apache config, any help would be greatly appreciated!! <VIRTUALHOST *:8080> ProxyRequests On ProxyVia On #ErrorLog "/var/log/apache2/proxy-error.log" #CustomLog "/var/log/apache2/proxy-access.log" common CustomLog "/var/log/apache2/cached-requests.log" common env=cache-hit CustomLog "/var/log/apache2/uncached-requests.log" common env=cache-miss CustomLog "/var/log/apache2/revalidated-requests.log" common env=cache-revalidate CustomLog "/var/log/apache2/invalidated-requests.log" common env=cache-invalidate LogFormat "%{cache-status}e ..." # This path must be the same as the one in /etc/default/apache2 CacheRoot /var/cache/apache2/mod_disk_cache # This will also cache local documents. It usually makes more sense to # put this into the configuration for just one virtual host. CacheEnable disk / #CacheHeader on CacheDirLevels 3 CacheDirLength 5 ##<IfModule mod_mem_cache.c> # CacheEnable mem / # MCacheSize 4096 # MCacheMaxObjectCount 100 # MCacheMinObjectSize 1 # MCacheMaxObjectSize 2048 #</IfModule> <Proxy *> Order deny,allow Deny from all Allow from x.x.x.x #IP above hidden for this post <filesMatch "\.(xml|txt|html|js|css)$"> ExpiresDefault A7200 Header append Cache-Control "proxy-revalidate" </filesMatch> </Proxy> </VIRTUALHOST> Thank you once again!

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• script calling script as other user

  - by viktor tron

  Using CentOs, I want to run a script as user 'training' as a system service. I use daemontools to monitor the process, which needs a launcher script that is run as root: : #!/bin/bash exec >> /var/log/training_service.log 2>&1 setuidgid training training_command This last line is not good enough since for training_command, we need environment for training user to be set. : su - training -c 'training_command' gives 'standard in must be tty' as su making sure tty is present to potentially accept password. I know I could make this disappear by modifying /etc/sudoers a la Bash & 'su' script giving an error "standard in must be a tty" but i am reluctant and unsure of consequences. : runuser - training -c 'training_command' gives runuser: cannot set groups: Connection refused. I found no sense or resolution to this message. I am stuck. Is this something so hard to achieve? I appreciate all insight and guidance to best practice.

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• managing a high traffic media sharing website

  - by Jordan Westerman

  i'm in the process of developing a website that i predict will generate a lot of traffic. the site will be similar to many other sites offering free media streaming: mp3's. we are going to start with a pretty minimal amount of media to share, but the basic idea is that artists will set up a profile page with music they have made available for consumers to visit the page and listen to the music. we are starting with just a handful of artists, but i think that this project will generate more and more artist pages. eventually i'd like to set it up so consumers can create personalized playlists. how can i best prepare server space and bandwidth capabilities? i have a small team of web designers and programmers working on the site, as i am pretty illiterate when it comes to site management. as the ring leader of this organization, i am more or less looking for financial requirements and monthly burn rate estimates. i don't have a ton of capitol to start with, putting together a business plan, but i am seeking investments. i have a game plan to grow fast enough to be successful, and slow enough to manage the financial growth requirements. any questions i may have failed to ask myself? is it realistic to start this project on a shared server, and upgrade? any financial advice you think i can use? i really appreciate any advice given, as this is my first business venture. thank you all in advance. Jordan Westerman D.B.A. Badfish Productions, LLC

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• Ubuntu 12.04 froze during update, won't boot

  - by Cichol

  I've recently installed Ubuntu 12.04 on my laptop, and every time i tried to update it, it would freeze for a few seconds, and tell me that the updates could not be downloaded. After many, many tries I managed to get them downloaded, but then in the middle of installing them, it froze. Completely. No mouse movement, no blinking lights, no nothing. After a few hours of letting it sit there, I finally hit the power button to do a hard reset, and now when I select Ubuntu on the boot screen (Dual-boot with Windows 7), I get a blank purple screen, and then nothing. Another freeze. I've tried getting into the console, but no command I input has any visible effect. I have a ton of music stored on the partition it's in, so I'd really rather not have to reinstall. My specs, to the best of my knowledge: Clevo Corp model B7130 (Sager custom) CPU: Intel Core i5 @ 2.53gHz (4 CPUs) Graphics Card: Nvidia GeForce 425m 4096 MB RAM Drivers: Whatever comes with the download of 12.04. As a side-note, I installed Ubuntu via the Windows Installer program (wubi). Does that make a difference?

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• Configuring port forwarding for SSH - no response outside LAN [migrated]

  - by WinnieNicklaus

  I recently moved, and at the same time purchased a new router (Linksys E1200). Prior to the move, I had my old router set up to forward a port for SSH to servers on my LAN, and I was using DynDNS to manage the external IP address. Everything worked great. I moved and set up the new router (unfortunately, the old one is busted so I can't try things out with it), updated the DynDNS address, and attempted to restore my port forwarding settings. No joy. SSH connections time out, and pings go unanswered. But here's the weird part (i.e., key to the whole thing?): I can ping and SSH just fine from within this LAN. I'm not talking about the local 192.168.1.* addresses. I can actually SSH from a computer on my LAN to the DynDNS external address. It's only when the client is outside the LAN that connections are dropped. This surely suggests a particular point of failure, but I don't know enough to figure out what it is. I can't figure out why it would make a difference where the connections originate, unless there's a filter for "trusted" IP addresses, which is perhaps just restricted to my own. No settings have been touched on the servers, and I can't find any settings suggesting this on the router admin interface. I disabled the router's SPI firewall and "Filter anonymous traffic" setting to no avail. Has anyone heard of this behavior, and what can I do to get past it?

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• How to HIDE "client denied by server configuration:" error in log

  - by Keith

  I want to block access to my web server by default as a precaution but I keep getting the following errors showing up in my error log. [Wed Jun 27 23:30:54 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/Edu.jar [Wed Jun 27 23:32:40 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/REST.jar [Wed Jun 27 23:35:39 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/Set.jar [Thu Jun 28 01:01:17 2012] [error] [client 58.218.199.227] client denied by server configuration: /home/www/default/proxyheader.php [Thu Jun 28 02:34:57 2012] [error] [client 58.218.199.227] client denied by server configuration: /home/www/default/proxy.php [Thu Jun 28 05:41:33 2012] [error] [client 58.218.199.227] client denied by server configuration: /home/www/default/proxyheader.php [Thu Jun 28 06:55:10 2012] [error] [client 180.76.6.20] client denied by server configuration: /home/www/default/ [Thu Jun 28 07:31:26 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/Edu.jar [Thu Jun 28 07:32:25 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/REST.jar [Thu Jun 28 07:36:10 2012] [error] [client 86.77.20.107] client denied by server configuration: /home/www/default/Set.jar I don't really want these errors to show up but whatever I do, I can't get rid of them. Does anyone know how I can achieve this? Here is a copy of my configuration. <VirtualHost *:80> DocumentRoot /home/www/default <Directory /> AllowOverride None Order Deny,Allow Deny from all </Directory> #ErrorLog /var/log/apache2/error.log #LogLevel warn CustomLog /var/log/apache2/access.log combined </VirtualHost>

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• Setting up Windows SBS 2008 network on Xen

  - by samyboy

  I'm trying to install a Windows SBS 2008 server in a Xen environment. The OS is booting fine. Unfortunately I can't figure out how to set up the network settings. Dom0 is a Debian Lenny hosting around 10 virtual servers. Here are the settings I'm using in the hosted Windows SBS: IP address: 10.20.0.8 Network mask: 255.255.0.0 Gateway: 10.20.0.1 Note that during the installation stage, Windows set the net mask at 255.255.255.0 without letting me choose. Gross. Windows SBS tells me I have a "limited connection". I can't ping the gateway nor any other IP except localhost and it's own IP (10.20.0.8). Here is the Xen config file: kernel = '/usr/lib/xen-3.2-1/boot/hvmloader' builder = 'hvm' memory = '4096' device_model='/usr/lib/xen-3.2-1/bin/qemu-dm' acpi=1 apic=1 pae=1 vcpus=1 name = 'winexchange' # Disks disk = [ 'phy:/dev/wnghosts/exchange-disk,ioemu:hda,w', 'file:/mnt/freespace/ISO/DVD1_Installation.iso,ioemu:hdc:cdrom,r' ] # Networking vif = [ 'mac=00:16:3E:0A:D0:1B, type=ioemu, bridge=xenbr0'] # video stdvga=0 serial='pty' ne2000=0 # Behaviour boot='c' sdl=0 # VNC vfb = [ 'type=vnc' ] vnc=1 vncdisplay=1 vncunused=1 usbdevice='tablet' This config is working with others Windows XP domU's. I tried to change the ne2000 values with 0 and 1 with no effect. I am far from having good Windows administration skills so I guess I definitely need some help on this case. Thanks.

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• Why is wget so much faster than Firefox at some downloads?

  - by Earlz

  Recently, I needed to do an update of Xilinx WebPack, mind you, this is one hefty piece of software. It weighs in at 6gigs, which definitely isn't "quick" on any internet I've ever had available to me. So, when I went to download it(using Firefox of course), I was very... unsettled by the fact that the download was only going at 110kByte/s. My internet connection is capable of about 2200kByte/s download, so what gives!? My workaround in the past for this issue has been to take the link to my Linode linux server and download it there with wget, where the download will zip along at 14MByte/s, and then either copying it to my website directory and downloading it that way through HTTP, or using sftp. Both ways work about as well and will sufficiently max out my connection. However, I recently figured out the missing variable. I tried doing the download locally with wget and was able to max out my connection! TL;DR; Now, my question. Why is wget so much faster than firefox at downloading this file? I hardly ever have such a difference in download speeds except for with this one file.

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