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• setting up/installing/configuring nginx LEMP stack on fresh VPS server

  - by Grant Tailor

  I need some help in settingup/installing and configuring nginx LEMP stack on a fresh new VPS I have. The specs of the CentOS 5.7 VPS are 2GB DDR3 ECC RAM(4GB burst), 1 core 1.5Ghz(3Ghz burst) and 100GB RAID 10 storage, unmetered bandwidth @ 100Mpbs all for a whopping $25/month(unbeatable, yeah I know :) Anyways I have followed this LEMP (will also need MySQL and PHP) stack guide on linode http://library.linode.com/lemp-guides/centos-5 but basically what I want is to be able to host multiple website on this webserver after everything is setup. I am used to using DirectAdmin control panel on other server and want to have things setup so I can host multiple websites - mostly wordpress and drupal themes. Lets say 10 websites on this nginx web server. So can someone please help me on what I need to do to take "full" advantage of nginx power and performance, while been able to easily manage these multiple websites (wordpress and drupal themes)?

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• How to re-do the hard disks in a WD Word Book Edition II ?

  - by jfmessier

  I recently purchased a WD World Book II, a 2 TB one. I call it the "White Box". It has those 2 1TB drives, and they were in this RAID 1 config, only giving me about 1 TB. I could not delete the raid array, and I took the drives in a Linux box. But I also deleted the entire partitions of the disks, and I cannot even et the existing RAID array on this WD White Box. The drives are fine, but I cannot get them to work on the WD White Box. My goal was to get back to a real 2 TB storage space. If I cannot get those drives back in the White Box, I can re-use them elsewhere, but this would mean a waste of the firmware and network connection. After the fact, I read that, anyway, the network performance is rather poor. Thanks :-)

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• Web application and remote storage of files

  - by Matt

  Hi have a web application that can store lots and lots of files on the server. i.e. users upload data to it. The files are stored below a particular storage path. The web host will be an IBM xseries 345. However, the disks are really expensive so we would like to put the files onto a less expensive server. Now here is the question. Should I use an NFS mount on the IBM server of a path on the storage server? Or should I write some scripts to upload the files to the storage server instead. Both the storage server and the web host are on the same network. Only the web server is visible to the world. Is NFS performance suitable for an expected low to moderately loaded server?

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• TCP Tweaking options and Results: Any suggestions?

  - by krishnakumar

  I first tried with the default windows XP TCP option(It doesn't have TCPWindowSize option and TCP1323 in its Registry setting). I dynamically set those options using TCP optimizer. Here I list out the result with and without TCP Tweaking option. I see no major improvements in TCP after increasing window size optimally too. What value should I set to increase the performance? Results: Without any window size and MTU setting from server to client (receiving) TCPWindowSize : MTU : TTL: Size:586 MB total duration : 03:47 With window size extension from server to client (receiving) Bandwidth :100 Mbps Latency: 100ms BDP :1250000 TCPWindowSize : 1250000 MTU :1500 TTL:128 Size:586MB total duration : 03:44 With window size extension from server to client (receiving) TCPWindowSize :64240 MTU :1500 TTL :112 Size: 586MB total duration : 03:49

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• How to change XFCE to LXDE?

  - by kurp

  I've just installed LinuxMint XFCE, which seems to be still a bit to heavy for my hardware. Thus, I'm thinking about LXDE installation and wonder if a new Linux installation is necessary/advised in such case. The question is: how to switch easily? The additional questions are: a) is it necessary to remove the XFCE packages or both DEs may be installed at the same time? b) is there any way to simply switch between DEs (i.e. have both DEs available and boot with DE selected each time)? c) are there any performance consequences of having more than one DE installed? it means: is clean LXDE installation faster than Linux with 2 separate desktops?

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• XKB - remap arrow keys and preserve shift behaviour to select text

  - by dgirardi

  I realize arrow key remapping is an old problem, however I cannot seem to find a good solution that lets me select text with SHIFT + remapped keys as I would do with the vanilla arrow keys. For instance, if I remap Caps Lock to ISO_Level3_Shift and set xkb_symbols to read either key <AC08> { [ k, K , Down, Down] }; or key <AC08> { type="THREE_LEVEL", [ k, K , Down ] }; Pressing Shift+CapsLock+K will behave exactly as CapsLock+K (while Shift+Down behaves differently from Down alone). I had somewhat more success using higher level macro utilities and generating keyboard events (i.e. generate both the shift and the arrow keypresses); hoever that approach has a whole set of different problems - often the UI response to a simulated keypress is different from the "real" keypress, and there are performance problems as well - I can type faster than the thing can handle. Tl;dr; how can you shift-select using remapped arrow keys under X?

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• RAID0 array of USB 2 disks, both connected to a single hub. Any benefit?

  - by Josh

  I have two unused USB 2 drives. I wanted to stripe them in a RAID0 configuration for fast disk access for virtual machines. (I find running a VMware virtual machine off a USB2 drive to be painfully slow. Especially Windows Vista) If I have both USB drives attached to the same USB2 hub, will that negate any benefit I gain by creating a RAID0 array? That is to say, is the speed of USB2 the limiting factor or is the speed of the drives? Would I get better performance by attaching one or both drives directly to my computer?

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• Deep freeze alternative for Ubuntu

  - by Nrew

  I made some research and found out that Deep freeze is not available for ubuntu. Is there a software like deep freeze for Ubuntu 10.04. To prevent writing data on the disk. I need this so that I could try all sorts of stuff on Ubuntu without worrying if I could damage the Windows installation that is installed along side with it. Virtual box is good. But the performance is not. Because I only have 2gb of ram.

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• Packet loss with all adapters on one PC only on the LAN

  - by Enigmativity

  I have a Windows 7 64-bit machine that is losing up to 20% of IP packets on both adapters - wireless & LAN. Browser traffic appears to be affected the most, but it is happening to all protocols. All other computers on the network are functioning fine. If I ping from my faulty machine to any machine on the LAN (wired or wirelessly), including the router/gateway and internet sites, I get up to 20% packet loss. If I do the following commands: ipconfig /release ipconfig /renew then I sometimes get my network performance back for a matter of a few seconds to less than a couple of minutes. Rebooting also works for a short period of time. This problem has been occurring for a couple of months and is getting worse. The computer used to work just fine. I updated the wireless adapter firmware the other day with no effect. Does anyone know what is happening?

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• Best practice Raid groups for EqualLogic PS6510X

  - by 20th Century Boy

  We are thinking about purchasing 4 x EqualLogic PS6510X SANs (the Sumo boxes). Each has 48 x 600GB 10k SAS drives. They will be stacked to form a logical pool of storage (all in the same location). I understand that when you create a RAID group its done on a "per box" basis. So one box could be Raid 50, another Raid 10 etc. My question is, should I make one box a "performance" box ie Raid 10, and the other boxes "standard" ie Raid50? How do people configure their EQL arrays in the real world?

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• Tips and tricks to make NX server more stable

  - by gareth_bowles

  My shop has been using the FreeNX server on Fedora 11 for a while now and mostly getting good results, especially with performance, but we have some annoying problems with client connections. There are two main issues: Client sessions sometimes freeze after a long time (seems to be at least 2 hours of having the session active) We often have to make multiple attempts to start a new client session, especially if a previous session was suspended rather than terminated. In qwuite a few cases, we've had to restart the NX server to get around this. Our NX server configuration is the default except that we've enabled logging level 7 to /var/log/nxserver.log, and set the font server to "unix:/7100" so that it uses xfs. Does anyone have any ideas for making things more stable ?

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• back-end SQL server 2005 databases for website

  - by Datapimp23

  Hi, We're migrating an existing IIS website + MS SQL 2005 database (on the same server) to a new test set-up. The existing set-up is too slow. I want one ISS server and 2 X MS SQL server 2005. One live DB server for the website queries (inserts, updates) and another for backups, reports or stored procedures. So the live DB should be more aimed at performance. The other doesn't even need to be synced instantly. What is the best way in SQL server 2005 to set this up. Can somebody point me in the right direction and give me some pointers. Thanks

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• virtual machines

  - by André Alçada Padez

  well, i hope this doesn't get categorized as a boating question, but it really is related to programming. I have windows XP, and i am going to have to have a VM running: Windows 7 Visual Studio 2008 Sql Server 2008 IIS 7 (8 in a little while) Wamp Photoshop CS5 etc... so i was wondering what should i use to be easier to install and configure, and best performance: Virtual Box or Microsoft's Virtual Machine? Thank you Well i tried Virtual Box, it's always crashing for some reason. I think i'm going to try Virtual PC, just to stick to an all Microsoft Solution.

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• Iptables massive 1:1 NAT

  - by TiFFolk

  I have to connect two LANs: LAN1: 10.10.0.0/16 and LAN2: 192.168.0.0/16. I can't do simple routing, because 192.168.0.0/16 net is prohibited in LAN1, so I am thinking of using Full cone nat (1:1) to translate 192.168.x.y/16 to 10.11.x.y/16. Each translation is done by this rules: iptables -t nat -A PREROUTING -d 10.11.0.0/16 -j DNAT --to-destination 192.168.0.0/16 iptables -t nat -A POSTROUTING -s 192.168.0.0/16 -j SNAT --to-source 10.11.0.0/16 But I will have to enter 254*254*2 rules, what will, I think, result in enormous performance degradation. So, is there a way to write such one-to-one translation with minimum number of rules?

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• iSCSI - what's faster?

  - by Unplugme71

  I have a DroboPro that is currently connected to a GS748TS switch. Also connected to the switch is a server and few workstations. Which method would be better in performance? Add a NIC to the server. Direct connect the DroboPro via iSCSI to the new NIC. Add a NIC to the server. Create a dedicated VLAN for the new NIC and Drobo. Add a NIC to the server and attach it to a separate switch. DroboPro connects to the switch. Becomes a private network, similar to a VLAN. DroboPro has a single ethernet connection. Server has a single ethernet connection (currently). Workstations each have a single ethernet connection.

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• SQL Server 2005 SP3 Express Backups Incredibly Slow

  - by Adam Robinson

  I'm attempting to troubleshoot an issue with one of our customers who's using SQL Server 2005 SP3 Express to house their application data. The automatic backups that we perform when upgrading our application are timing out after 30 minutes, and I've been sitting and watching the backup take place in SSMS for about 20 minutes now and it's only gotten to 30%. The database is only slightly over 1GB, so I'm baffled as to what could be causing this sort of horrible performance. The machine is a 1.87GHz Xeon with 3GB of RAM running Windows Server 2003 R2. While that's hardly a powerful box, this seems ridiculous. Does anyone have any idea why these backups could be taking so long and, more importantly, how I can do something about it?

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• Set WordPress permalinks directly in httpd.conf?

  - by songdogtech

  Is is possible to configure WordPress permalinks directly in Apache httpd.conf? I have a server situation (Apache 2.2.3 CentOS PHP5.1.6) where I can't use .htaccess for performance reasons, but can use httpd.conf. The admin says that mod_rewrite is enabled, but AllowOverride is not, and I can't change those settings. And I need to restrict the permalinks to just the "blog" directory. This is what would go in .htaccess but needs to go into httpd.conf: <IfModule mod_rewrite.c> RewriteEngine On RewriteBase /blog/ RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /blog/index.php [L] </IfModule> Thanks...

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• Tomcat - virtualhosting - name / ip / port - based

  - by lisak

  Hey, what are the usage scenarios for these kinds of virtual hosting ? Name Based - typical tomcat virtual hosting, one HOME instance with many contexts, each as an individual host IP based / port based - multiple instances of tomcat ( how is it with performance and memory consuption?) running on IP aliases (virtual IPs) for one network adapter, usually behind http apache server that can run name based virtual hostings. Otherwise I can't figure out how would I forward requests in iptables/firewall based on IP address, which is just one. How is IP based virtual hosting done as to Tomcat and multiple instances ? I'd like to hear some usage scenarios from your experience. How are you running your applications. Cause there are applications having it's own modified classloader and they are developed in a way to run alone withing a tomcat instance. Then there are trivial applications which can run within one instance without problems. Many thanks

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• MongoDB on FreeBSD

  - by Hartator

  We are currently using MongoDB 2.0.0 on MacOS but our servers are running FreeBSD. The most recent port of MongoDB is the 1.8.3 version. I have tried to compile the 2.0.0 by hand but I came across errors that I didn't manage to fix. I came across on the Internet a few old resources which are saying that MongoDB does not run well on FreeBSD mainly for performance issue (memory mapped files). Is that true ? Does it mean we have to switch our server to another OS ? Thanks for your opinions! Sources : http://groups.google.com/group/mongodb-user/browse_thread/thread/8131b7e5a5c710d9 http://ivoras.net/blog/tree/2009-11-05.a-short-time-with-mongodb.html

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• SQL Server Files Local or NAS or SAN?

  - by Jedi Master Spooky

  I have to install a new Server with SQL Server 2008, What do you recommend, One server with Raid 10 or the Files in a NAS? What about iSCSI should I use it? What about SAN? The server has 4Gb of RAM and that database file is about 2GB. To make my self clear today the server has no RAID, I have to implement some kind of strategy so if something happend I can have my files safe, so What should I choose Local Files, NAS, SAN? What option has the most performance, what is the more secure?

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• MySQL on Windows - how do I set the wait_timeout for connections using named pipes?

  - by gustafc

  I use a MySQL database running on a Windows box, and for performance reasons I'm connecting to it using named pipes. The (Java) application using the database (through Hibernate) can let the connection lie idle for quite a long time, which causes the connection to fail with the following message: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 33 558 297 milliseconds ago. The last packet sent successfully to the server was 33 558 297 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. autoReconnect unfortunately has no effect (and neither does autoReconnectForPools), but the wait_timeout docs state that wait_timeout only applies "to TCP/IP and Unix socket file connections, not to connections made via named pipes, or shared memory". How can I change the wait_timeout for named pipes?

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• My HP-Vista based laptop has become very slow recently

  - by goldenmean

  My HP laptop which has Vista Home premium. When I try to start Firefox, internet explorer, it becomes very slow. No other app. When i checked the Performance in Task Manager. It shows the Physical memory , Free as 0 bytes, almost always. This has been recently. Earlier it didn't used to be zero. Laptop has 2GB of RAM. I have nothing running in my tray except - Sound control, Laptop power plan indicator,Network status indicator. There are no other processes whose memory usage adds up to so high to make Free memory as 0. Then what could be hogging the memory and make the laptop very slow. Any pointers would help as it is crawling at the moment.

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• Which VMs are easier to install/configure and more performant?

  - by André Alçada Padez

  well, i hope this doesn't get categorized as a boating question, but it really is related to programming. I have windows XP, and i am going to have to have a VM running: Windows 7 Visual Studio 2008 Sql Server 2008 IIS 7 (8 in a little while) Wamp Photoshop CS5 etc... so i was wondering what should i use to be easier to install and configure, and best performance: Virtual Box or Microsoft's Virtual Machine? Thank you Well i tried Virtual Box, it's always crashing for some reason. I think i'm going to try Virtual PC, just to stick to an all Microsoft Solution.

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• Elastic Load Balancer & SSL termination

  - by Aaron Scruggs

  I am setting up a Rails app on AWS that: 1) all traffic must ssl encrypted 2) will highly fluctuate in traffic on a weekly basis 3) will by maintained by someone that is a stronger coder than sysadmin, but will be responsible for both I am thinking that SSL termination on an elastic load balancer backed by small ec2 instances running nginx and unicorn A small subset of the requests will take longer than 10s, because of this I am also debating using 'thin' instead of 'unicorn'. My question is this: Is this sane? I am stepping into a quagmire of cost, maintainability, security or performance problems?

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• Prevent Ultrabay HDD from ejecting on sleep

  - by Bryce Evans

  I have a lenovo T430s thinkpad with a small SSD primary drive and 500gb ultrabay drive. When I put the computer to sleep and then return, I get the message titled "problem ejecting < drive name " "Windows can't stop your 'Generic volume' device because a program is still using it." This pop up is very annoying every time every time I use the computer. I don't want to disable write caching [D:Hardware[drive]policiesquick removal] because I want best performance and never remove the drive. Any ways to avoid this pop up?

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