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• Normalize Accept-Encoding via HAProxy for optimized Squid hit rate

  - by Matt Beckman

  Our website infrastructure uses HAProxy for load balancing, a Squid cluster for caching, and application data is on an IIS cluster. We load balance HAProxy by URI to optimize the Squid hit-rate, but we know that Squid is holding different copies of each page based on the Accept-Encoding header passed to it by the browser, and so IE (gzip, deflate) will have a different copy of a cached page than Firefox (gzip,deflate) or Chrome (gzip,deflate,sdch). We want to normalize the Accept-Encoding headers and I think the best place to do so would be in HAProxy. I'd appreciate it if someone could offer some ideas on how to accomplish this without breaking support for clients without gzip or deflate support.

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• Disable disk caches in AWS EBS for PostgreSQL?

  - by Alexandr Kurilin

  It's my understanding that, without correctly disabling OS-level and drive-level caching, there is a chance that in case of system failure the Write-Ahead Log might not be saved correctly and in fact might get corrupted, possibly preventing data recovery. I've already made sure that wal_sync_method=fdatasync however I was unable to make any configuration changes with hdparm since I get the following: $ sudo htparm -I /dev/xvdf /dev/xvdf: HDIO_DRIVE_CMD(identify) failed: Invalid argument Looks like that option is not available in the kind of setup you get in EC2. Am I missing anything here? Are there any other obvious caches I have to disable to ensure the WAL's safety?

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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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• How to cache streaming video and silverlight with squid windows reverse proxy

  - by V. Romanov

  We have an intranet web server running a silverlight application (ACTUS media monitor if anyone cares to know). The server is used to record video and stream it to clients through a CDN solution. We want to put a reverse proxy in between the server and CDN provider in order to remove the office network bottleneck that's currently strangling us. I've set up SQUID for windows on a separate machine outside the network using squid BasicAccelerator configuration setting. It seems to work as far as the reverse proxy is concerned, requests are forwarded and the application is working but it doesn't seem to cache anything (no space is used on the drive where squid is installed). I found to explicit setting to turn caching on in squid, so i assume it's on by default. Perhaps I need some other trick to make the video and/or silverlight cacheable? Any help will be appreciated. Any info you need to help me will be provided at once. Thanks in advance!

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• Shared block device file system (cluster file system without networking)

  - by fungs

  Is there any file system that can be mounted multiple times and supports concurrent file access for Linux? Basically I want something like a cluster file system but without the need to have a running network for a distributed lock manager. That can be very handy in connection with virtual machines that can share data with the host or another VM without the need to create a network link. This I want to avoid to keep the network architecture secure (virtual machine in DMZ) but share large files. No need to scale it up, just two machines that mount the same block device. Shouldn't it be possible to have file locking information right on the disk?

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• network user isolation

  - by seaquest

  My question is for a network with a Linux iptables router gateway. How can it be possible to prevent inter-network traffic of those users. Think this case as a public network, IPs are distributed through linux gw and users are authenticated thru the gateway. We want to protect public users from public users. Network is not wireless and I can not use Wireless AP user isolation. Actually I have a simple method. Subnet the network into /30 mask. Give minimum IP of each subnet to the gateay and ditribute those /30 IPs from the subnet. But this is pretty costly for such an aim. I want to ask for other methods Thanks.

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• Good firefox extension to download .flv flash video?

  - by Tamás Szelei

  I'm looking for a decent flash video downloader for Firefox. There are tons of them. I'd like to use it for a custom site with some random flash video player, not Youtube. How can it be accomplished? Edit: None of these methods you guys suggested worked so far; I looked up various places where the temporary file might end up - it just doesn't. It is indeed a flash player, but it seems like it's not caching - is that possible?

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• "RPC Server is unavailable" on Windows 7 Client with Samba3 making logon impossible

  - by HalloDu

  I am running an Samba 3.4.* Server with LDAP Backend on Ubuntu 10.04 LTS as a PDC for purely Windows 7 Clients (about 50). It worked quite fine for a long time, but now sometimes on some machines (really strange to replicate) I cannot login, because he tells me that there are no logon servers. When I look in the machines eventlog after logging in locally, the only error it shows is: "RPC Server is unavailable". The system was ported quite a while back from another machine running the same software versions to this new one. Are there maybe trust or caching issues between the workstations and the domain controller? The number of machines affecting is steadily increasing and so do you know any reason as to why this problem occurs? Any information on workstation and domain trust would also be welcome (After googleing I did not find anything really enlightening).

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• How can I improve performance over SMB/CIFS for an application that has poor write speeds?

  - by Jeremy

  I have a third party application that reads several large files and generates a third large file. Its performance is quite good when the generated file is stored on "local storage", i.e. either a direct attached or iSCSI-based disk. The source files that are read can be stored remotely on our NAS and accessed via SMB with little effect on performance. However, if we attempt to write the target file to any kind of SMB/CIFS share (Samba or Windows Server) the performance drops almost ten-fold. This is unacceptably slow in our case. Writing files to network shares is not otherwise slow. I can copy large files to SMB shares and get great performance - near what I would expect is possible given the disks and network in question. I have a theory that this application's problem with SMB shares has something to do with a lack of write caching over the share and perhaps lots of network roundtrips. Is this possible and is there anything that can be done about it?

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• Is it a bad idea to make roaming profile share available offline?

  - by Bryan

  This is regarding a Windows 2008 R2 domain. The Documents, Desktop, Application Data folders are all redirected to users' home directory (mapped as Z:). The users home directory is configured to be offline for mobile users. User profiles are configured as roaming, and located on a separate share (not mapped as a network drive), just accessed via an UNC path. Would it be a good or idea to make the roaming profile share available offline for mobile users using the caching option "All files and programs that users open from the share will be automatically available offline"?

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• How does MySQL 5.5 and InnoDB on Linux use RAM?

  - by Loren

  Does MySQL 5.5 InnoDB keep indexes in memory and tables on disk? Does it ever do it's own in-memory caching of part or whole tables? Or does it completely rely on the OS page cache (I'm guessing that it does since Facebook's SSD cache that was built for MySQL was done at the OS-level: https://github.com/facebook/flashcache/)? Does Linux by default use all of the available RAM for the page cache? So if RAM size exceeds table size + memory used by processes, then when MySQL server starts and reads the whole table for the first time it will be from disk, and from that point on the whole table is in RAM? So using Alchemy Database (SQL on top of Redis, everything always in RAM: http://code.google.com/p/alchemydatabase/) shouldn't be much faster than MySQL, given the same size RAM and database?

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• MacBook Pro Trackpad freeze / holds click on its own

  - by lajuette

  My MacBook Pro's Trackpad shows an annoying behavior in the last few days. I think the only relevant thing that changed is the firmware for the Trackpad. An update has been distributed via Software Update a few days ago. Sometimes when i click somewhere the Trackpad won't recognize the mouseup, i.e. hold the click on its own. Clicking again seems to stop the holding and issue a new mousedown, but then again, no mouseup I.e. when i click on a file on the desktop the file will be dragged. But i can't stop dragging! Clicking in a browser or text document will select the text/images. Did anyone notice similar behavior? Any ideas or fixes?

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• Weird Windows 2003 MSDTC and SQL 2005 issue

  - by seagull surfer

  scenario: Windows 2003 sp2 x64 enterprise edition. SQL 2005 sp2 cu9 x64 Enterprise edition After restarting the resource groups on two node active-active cluster, 3 SQL 2005 instances start up fine. The 4th one starts up but starts throwing the following error. "Enlist operation failed: 0x8004d00e(XACT E NOTRANSACTION). SQL Server could not register with Microsoft Distributed Transaction Coordinator (MS DTC) as a resource manager for this transaction. The transaction may have been stopped by the client or the resource manager." MSDTC is fine since the other 3 function normally. The only way to "fix" it is to take the 4th instance offline and bring it online again. Is there any way to fix this enlistment without restarting?

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

  - by Daddy Warbox

  Requirements: Can be set as always on top of 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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• How does azure memory usage work?

  - by Jed Grant

  I have a windows azure website. In the dashboard it shows me that I have used 1.51 GB of the 2GB available per hour. I keep increasing the number of instances available in the shared node so the site doesn't shut down. After each hour finishes, the memory usage still shows 1.51 GB used. I assume this would start at ZERO and then be used as time goes on, but that doesn't appear to be the case. How does server memory work? What are some reasons my application using this much memory? (I use no output caching and generally have just built off of the basic MVC templates provided in visual studio.) What other considerations should I be making to get the amount of memory needed to decrease?

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• bind: blackhole for invalid recursive queries?

  - by Udo G

  I have a name server that's publicly accessible since it is the authoritative name server for a couple of domains. Currently the server is flooded with faked type ANY requests for isc.org, ripe.net and similar (that's a known distributed DoS attack). The server runs BIND and has allow-recursion set to my LAN so that these requests are rejected. In such cases the server responds just with authority and additional sections referring the root servers. Can I configure BIND so that it completely ignores these requests, without sending a response at all?

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• 504 Gateway Time-out after php fatal error

  - by tiagojsag

  I'm using nginx and php-fpm to develop a symfony2 based website, under ubuntu 12.10 (yes, I know I'm using a beta OS). Everything was working out fine until, due to an error on my code, I called an unexisting function, and got the following: Fatal error: Call to a member function (....) This isn't a problem (it's a bug in my code, easily fixable), but after this, no other page loads. My browser just keeps trying to load the page from the webserver, until nginx timeouts (after +- 30s, which should be some default timeout) and returns: 504 Gateway Time-out Restarting php-fpm solves the issue. Nginx logs show a timeout message, and nothing appears on php-fpm logs, even if I set them to debug level. I tried switching from fpm to fastcgi, and the same thing happens. I've looked around, but all similar error are related to big requests/file handling, which isn't the case. All the pages on my website load in a few seconds, even under development conditions (no caching, etc).

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• FoxPro 2.6 DOS on Windows 7 64-bit

  - by Rolando

  I support a company that has a very old, mission critical, FoxPro for DOS 2.6 (FPD) application. For variuos reasons the company didn't adapt/migrate their app, which, ironically, has been running even better under Windows XP (and 32-bit Win7) because the OS allowed new features like more reliable networking, distributed printing, email integration. Unfortunately for this company, most new machines now come with a 64-bit version of Windows 7, which is incompatible with their FPD app. I know this time the writing is on the wall: the only long-term solution is to migrate their app. But I wonder if anyone can suggest a temporary alternative path, which doesn't involve either: downgrade 64-bit Windows to 32-bit, or run the app on a virtualized 32-bit XP

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• Routing application traffic through specific interface

  - by UnicornsAndRainbows

  Hello All! First question here, so please go easy: I have a debian linux 5.0 server with two public interfaces. I would like to route outbound traffic from one instance of an application via one interface and the second instance through the second interface. There are some challenges: both instances of the application use the same protocol both instances of the application can access the entire internet (can't route based on dest network) I can't change the code of the application I don't think a typical approach to load balancing all traffic is going to work well, because there are relatively few destination servers being accessed in the outbound traffic, and all traffic would really need to be distributed pretty evenly across these relatively few servers. I could probably run two virtualized servers on the box and bind each of them to a different external ip, but I'm looking for a simpler solution, maybe using iproute or iptables? Any ideas for me? Thanks in advance - and I'm happy to answer any questions.

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• is my xml cached by IIS7?

  - by user22817

  Hi guys, I have a flashplayer on my website. Behind it, there is an xml file which keeps the configuration of the products shown on that flashplayer. I do not understand why, if i modify something in the xml config file, the flash player is not updated at that moment, but after hours... Do you know why? I have not defined any rule for output caching in IIS7 so there is probably something default? Of course, i've tried Ctrl+f5 but does not work. Thanks.

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• Saving each layer of a Photoshop image to separate files

  - by BadKnees

  I have a PSD file with all icons in separate layers as vectors. I would like to save them in different sizes to use in iPhone, iPhone4 and iPad. I tried Files Scripts Export Layers to Files That took about 15 minutes to save each layer while the computer was overheating from the work. Tried with two different computers, one with CS4 and the other with CS5. Same result. And that doesn't allow me to set sizes. Seem like most icon packs, like pictos, glyphish and iconsweets are distributed in this way, in one PSD file. Is some easy way to get them out of the PSD and into PNG files?

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• What would be the ideal SAS package to integrate with a Enterprise scale web application developed using Java

  - by Rajesh

  SAS-Java Connectivity and Integration for a enterprise class web application - I am trying to narrow down the available approaches to connect to SAS frm Java. I am asusming the following , please correct my assumption if you think is not correct SAS ACCESS (ODBC, JDBC) /SAS Share Net- Query SAS Datasets using a JDBC Model SAS/Intr Net (For Connectivity with Java and build small scale applications) SAS Integration Technology (For Connectivity with Java and build Distributed Java Applications) Now the scenario is i need to build a enterprise class web application using Java/J2EE and ensure this application talks to SAS for Querying SAS Datasets Execute SAS Programs and generate Reports I am looking for a cost effective and robust solution which will work in a Multi user environment.

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• Tunneling over HTTP

  - by Morgan

  Hello, I have a network at work that is locked behind a firewall and Internet connection is available only by using a proxy server. At work, I can connect to databases that are distributed across the network. However, at home, I cannot connect to the proxy server or the databases. How can this be done? I can access my workstation via LogMeIn, so I can install anything on it. I thought of installing some kind of tunneling mechanism in my workstation. Then, at home, I could connect to this mechanism, which would in turn do the required connections. So essentially, what I'd like to do can be represented by the following diagram: Home = Workstation = Database. For example, whenever I connect to, say, 10.140.0.1:1234 at home, this would be redirected to 10.140.0.1:1234 of my Workstation, because 10.140.0.1:1234 is only available through the corporate network. NOTE: I'm using Windows XP.

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• Shared storage for web cluster

  - by user52475

  Hi all! Have a big question about shared/clustered/distributed file system for storage. It will shared storage for shared web hosting (web files + maildir) and OpenVZ containers storage . Have any one working example of such system? The options are: Lustre GFS1/GFS2 - GFS2 - as I understand is EXPERIMENTAL... NFS This 3 systems which I consider for shared storage. Now I have storage with HW RAID 10 - 1TB. NFS - As I know there will be problem with locking? GFS/Lustre - problems when there will be a lot of small files , what is typical for hosting environment and problems with maildir.

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• Eclipse: Help with EGit

  - by someguy

  I want to be able to use a version control system. Although Eclipse comes with CVS, I think it's better that I use a distributed version control system, such as GIT. I was pretty much sold after reading this article. Anyway, I installed EGit and followed this guide on how to set it up. However, I ran in to a few problems: Adding .project and .classpath inside .gitignore did not seem to work. When I try to open a committed file, it throws an error, saying: "IO error reading Git blob [...]" What am I doing wrong? If more information is needed, please specify and I will give.

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