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• APC fragmentation on EC2 Micro for Wordpress + W3TC

  - by Maarten Provo

  I'm trying to optimize APC for my Amazon EC2 Micro server running one Wordpress-site with W3TC. I've started with the settings advised by TechZilla in another topic but I keep getting high fragmentation with 50% of space being free. I've uploaded an image to http://www.maartenprovo.be/downloads/apc.jpg but I can't post it here since I need at least 10 reputation. What values can I optimize to prevent fragmentation? [apc] apc.enabled=1 apc.shm_segments=1 ;32M per WordPress install apc.shm_size=164M ;Leave at 2M or lower. WordPress does't have any file sizes close to 2M apc.max_file_size=2M ;Relative to the number of cached files apc.num_files_hint=1000 ;Relative to the size of WordPress apc.user_entries_hint=4096 ;The number of seconds a cache entry is allowed to idle in a slot before APC dumps the cache apc.ttl=7200 apc.user_ttl=7200 apc.gc_ttl=3600 ;Auto update chache files on change in WP-ADMIN or W3TC apc.stat=1 ;This MUST be 0, WP can have errors otherwise! apc.include_once_override=0 ;Only set to 1 while debugging apc.enable_cli=0 ;Allow 2 seconds after a file is created before it is cached to prevent users from seeing half-written/weird pages apc.file_update_protection=2 ;Ignore files apc.filters apc.slam_defense = 0 apc.write_lock = 1 apc.cache_by_default=1 apc.use_request_time=1 apc.mmap_file_mask=/var/tmp/apc.XXXXXX apc.stat_ctime=0 apc.canonicalize=1 apc.write_lock=1 apc.report_autofilter=0 apc.rfc1867=0 apc.rfc1867_prefix =upload_ apc.rfc1867_name=APC_UPLOAD_PROGRESS apc.rfc1867_freq=0 apc.rfc1867_ttl=3600 apc.lazy_classes=0 apc.lazy_functions=0

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• Why isn't 'Low Fragmentation Heap' LFH enabled by default on Windows Server 2003?

  - by James Wiseman

  I've been investigating an issue with a production Classic ASP website running on IIS6 which seems indicative of memory fragmentation. One of the suggestions of how to ameliorate this came from Stackoverflow: How can I find why some classic asp pages randomly take a real long time to execute?. It suggested flipping a setting in the site's global.asa file to 'turn on' Low Fragmentation Heap (LFH). The following code (with a registered version of the accompanying DLL) did the trick. Set LFHObj=CreateObject("TURNONLFH.ObjTurnOnLFH") LFHObj.TurnOnLFH() application("TurnOnLFHResult")=CStr(LFHObj.TurnOnLFHResult) (Really the code isn't that important to the question). An author of a linked post reported a seemingly magic resolution to this issue, and, reading around a little more, I discovered that this setting is enabled by default on Windows Server 2008. So, naturally, this left me a little concerned: Why is this setting not enabled by default on 2003, or If it works in 2008 why have Microsoft not issued a patch to enable it by default on 2003? I suspect the answer to the above is the same for both (if there is one). Obviously, we're testing it in a non-production environment, and doing an array of metrics and comparisons to deem if it does help us. But aside from this I'm really just trying to understand if there's any technical reason why we should do this, or if there are any gotchas that we need to be aware of.

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• Understanding RedHats recommended tuned profiles

  - by espenfjo

  We are going to roll out tuned (and numad) on ~1000 servers, the majority of them being VMware servers either on NetApp or 3Par storage. According to RedHats documentation we should choose the virtual-guestprofile. What it is doing can be seen here: tuned.conf We are changing the IO scheduler to NOOP as both VMware and the NetApp/3Par should do sufficient scheduling for us. However, after investigating a bit I am not sure why they are increasing vm.dirty_ratio and kernel.sched_min_granularity_ns. As far as I have understood increasing increasing vm.dirty_ratio to 40% will mean that for a server with 20GB ram, 8GB can be dirty at any given time unless vm.dirty_writeback_centisecsis hit first. And while flushing these 8GB all IO for the application will be blocked until the dirty pages are freed. Increasing the dirty_ratio would probably mean higher write performance at peaks as we now have a larger cache, but then again when the cache fills IO will be blocked for a considerably longer time (Several seconds). The other is why they are increasing the sched_min_granularity_ns. If I understand it correctly increasing this value will decrease the number of time slices per epoch(sched_latency_ns) meaning that running tasks will get more time to finish their work. I can understand this being a very good thing for applications with very few threads, but for eg. apache or other processes with a lot of threads would this not be counter-productive?

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• Centos Server/MySQL server problem

  - by Jake

  Hello all, I currently run a website we get about 15,000-20,000 hits a day. We currently run a very active forum, that is hosted using Vbulletin software. We have 4.5 Million Posts, 80,000 Threads, with about 11,000 members of which just under a third is active all the time. Now I am running a Intel Xeon Quad Core (2.13Ghz) with 4GB of RAM, Centos 5.5 and running DirectAdmin on the box to manage it. I also run the current stable version of Apache, MySQL, and php. This is the only site that is hosted on this machine. Now during random times of day sometimes when it gets busy the server load can get to like 20, but this can also happen when we only have like 200 users active too. I dont understand what is causing these problems. Sometimes I get pages that can generate in .2 seconds other times it takes like 5-8 seconds. I have customized the my.cnf file and that has not helped out anything, I didnt know where else to turn so if anyone has any suggestions please let me know. Thank You In advance.

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• URL Redirect Configuration in Virtualhost for a Single Page Web Application

  - by fenderplayer

  I have a web application under development that I am running locally. The home page of the application is fetched with the following url: http://local.dev/myapp/index.shtml When the app runs, javascript on the webpage maintains the url and the app state internally. Some of the other urls read as: http://local.dev/myapp/results?param1=val1&param2=val2 http://local.dev/myapp/someResource Note that there are no pages named results.html or someResource.html on my web server. They are just made up URLs to simulate RESTfulness in the single page app. All the app code - javascript, css etc - is present in the index.shtml file So, essentially, the question is how can I redirect all requests to the first URL above? Here's how the vhost configuration looks like: <VirtualHost 0.0.0.0:80> ServerAdmin [email protected] DocumentRoot "/Users/Me/mySites" ServerName local.dev RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(myapp|myapp2)\/results\?.+$ $1/index.shtml [R=301,L] <Directory "/Users/Me/mySites/"> Options +Includes Indexes MultiViews FollowSymlinks AllowOverride All Order allow,deny Allow from all </Directory> ErrorLog "/private/var/log/apache2/error.log" CustomLog "/private/var/log/apache2/access.log" common </VirtualHost> But this doesn't seem to work. Requesting the other URLs directly results in 404 error.

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• Free software for backing up an attached network drive

  - by Richard

  My wireless router comes with a USB connector which allows me to plug an external hard drive in and it'll act as a Network Attached Storage. The problem is that I want to backup this hard-drive to the external drive of another computer so that if the NAS drive fails, I don't lose everything. However, Windows 7 Backup refuses to include the NAS as a location to backup. I can't fool it by mapping it to a drive letter either. Google presents lots of pages on how to backup files to a NAS, but not the other way around. Can anyone advise me on free software which can do incremental backups of a NAS drive to an external drive attached the computer it is running on? I'm aware of this question but the top answers have one or more of the following issues: They aren't free. The free version cannot backup a NAS. They cannot do incremental backups. They're just a script and therefore have limited other functionality (eg. disk space management, scheduling, compression, etc.etc.)

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• Local SSL connections are causing redirect loop (after Ubuntu update)

  - by codeinthehole

  Following a recent Ubuntu update, my local websites are no longer serving their pages over SSL. For example, my .htaccess file attempts to ensure /sign-in is always served over HTTPS: RewriteEngine On RewriteCond %{HTTPS} off RewriteCond %{REQUEST_URI} /sign-in RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [L,QSA,R=301] However when I make a request to /sign-in on the domain site2-local , I get the error "The page isn't redirecting properly" with the following in /var/log/apache2/error.log [Tue Jun 08 12:20:57 2010] [info] [client 127.0.1.1] Connection to child 0 established (server site1-local:443) [Tue Jun 08 12:20:57 2010] [info] Seeding PRNG with 656 bytes of entropy [Tue Jun 08 12:20:57 2010] [info] Initial (No.1) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.2) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.3) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.4) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.5) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.6) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.7) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.8) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.9) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.10) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:21:12 2010] [info] [client 127.0.1.1] (70007)The timeout specified has expired: SSL input filter read failed. [Tue Jun 08 12:21:12 2010] [info] [client 127.0.1.1] Connection closed to child 0 with standard shutdown (server site2-local:443) There is a connection to site1-local (another site on my machine which shares the certificate), which I don't understand. Anyone know what is causing this issue?

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• VirtualBox VM running web server not accessible via external IP

  - by mwigdahl

  I have a Windows 7 machine running VirtualBox with an Ubuntu guest. The guest has a Bitnami LAMP stack installed. I have the guest configured for Bridged networking, and I can access the guest web server just fine from other machines on my LAN using the guest's IP. I'm trying to configure port forwarding so that I can access the web server from outside my LAN. (The router is a 2WIRE model as I'm on ATT's UVerse). I've set up port forwarding for ports 80 and 443 to the guest's IP in a similar manner to how I had them set up for my previous, physical web server, which worked just fine. However, I cannot seem to access the new, virtual web server using my external IP on the forwarded port. I suspected Windows Firewall issues on the host, but disabling it didn't solve the issue. Anyone have advice on what I should try next? EDIT: I've now attempted disabling the firewall on the guest with sudo ufw disable -- that doesn't seem to help either. However, after checking the router's port forwarding in more detail I may see the problem. My VM is named "linux" and in the router's configuration pages it shows up inconsistently. Sometimes it reports with a valid LAN IP and other times it doesn't show up with any IP. Even when it shows the correct IP the router indicates that it is disconnected. Could this be an indication that the 2WIRE router doesn't play well with VirtualBox's bridged networking mode?

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• Recommendation for robust, customizable, open source, Java servlet-based forum software?

  - by Erik Hermansen

  There is a lot of forum software out there, but it seems to me that a lot of the popular choices are PHP-based. And for my project, I'd like something based on Java servlets so my team can make customizations to it. Another important feature is that I can completely change the pages to hide unwanted elements without too much work. So I'm looking either for a template system or easily editable scripts (i.e. JSPs) that have a clean view separation. Just having skin changes or CSS customization is not enough. I understand that if I have open source, I can change anything I want, but my point is that it should be easy and not requiring mastery of a complex code base. Finally, I want something that has been around for at least a year and deployed on some high-traffic sites. Clustering support (one database, multiple web servers) is highly desirable. Up-time is crucial since I have an SLA to support. What do you think?

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• Disadvantages of enabling 'Low Fragmentation Heap' LFH on Windows Server 2003?

  - by James Wiseman

  I've been investigating an issue with a production Classic ASP website running on IIS6 which seems indicative of memory fragmentation. One of the suggestions of how to ameliorate this came from Stackoverflow: How can I find why some classic asp pages randomly take a real long time to execute?. It suggested flipping a setting in the site's global.asa file to 'turn on' Low Fragmentation Heap (LFH). The following code (with a registered version of the accompanying DLL) did the trick. Set LFHObj=CreateObject("TURNONLFH.ObjTurnOnLFH") LFHObj.TurnOnLFH() application("TurnOnLFHResult")=CStr(LFHObj.TurnOnLFHResult) (Really the code isn't that important to the question). An author of a linked post reported a seemingly magic resolution to this issue, and, reading around a little more, I discovered that this setting is enabled by default on Windows Server 2008. So, naturally, this left me a little concerned: Why is this setting not enabled by default on 2003, or If it works in 2008 why have Microsoft not issued a patch to enable it by default on 2003? I suspect the answer to the above is the same for both (if there is one). Obviously, we're testing it in a non-production environment, and doing an array of metrics and comparisons to deem if it does help us. But aside from this I'm really just trying to understand if there's any technical reason why we should do this, or if there are any gotchas that we need to be aware of.

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• Disable CTRL+mouse wheel zooming in Chrome?

  - by Peter Nore

  I'm a normal-sighted person and I would like to view pages at 100% all the time. I use keyboard shortcuts that involve CTRL a lot, so about twenty times a day I accidentally hit CTRL at the same time that I'm scrolling, which results in the page being reflowed and repainted. This in is annoying because it can take up to 30 seconds to fix the issue, depending on how complex the site layout is. On sites with dynamic layout such as Google Docs the problem is more serious; accidentally hitting CTRL+mouse wheel corrupts the display and forces me to refresh the page entirely, sometimes causing me to loose information in the process. I would like to either decouple CTRL+mouse wheel from zoom, or disable zoom functionality altogether. This is possible on Firefox by using about:config; is there a similar way to edit detailed settings in Chrome? Would I have access to the detailed settings if I used Chromium instead of Chrome? I'll probably jump ship back to Firefox if I can't solve this problem. There is a superuser question that asks basically the same thing I'm asking, but for Firefox and Internet Explorer exclusively. Other people on the Chrome forum have had related issues, but none have the same problem. "I would really like it if I could deactivate the auto zoom in/out." had "something with laptops and Windows 7", not the feature built into Chrome. Other people have had PDF specific issues, which doesn't concern me. I've also tried searching for extensions that allow you to disable the scroll; I had hoped that "Zoom Lock" would have the ability to lock the zoom at 100% and prevent CTRL+scroll wheel from distorting the display, but it doesn't work for my use case. Google Chrome version 9.0.597.84 (Official Build 72991) Operating System: Ubuntu 10.10

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• .NET 2.0 Application now running slow on IIS 7.5

  - by Valien

  I recently moved (and still in testing) an application from a Windows 2003 Server (Physical box) running IIS 6.x to a Windows 2008 R2 Standard (VM) IIS 7.5 server. The application is a .NET framework 2.0 application and is running under a 2.0 App Pool. This site works great except for one thing: Takes forever to get a request back. I've been tracking it with Chrome Inspect Element and it queries the site and can take up to 45 seconds to answer. Now when it does the page(s) render instantly but it's that initial request that's killing it. I see no error logs or issues with the application or Windows Event Viewer or even IIS logs so not sure where to start looking next. Some new changes was that previously the app resided behind a Pix firewall and now is behind a larger network environment in a DMZ zone (and I believe NetScaler is also being used to manage the network). I do not have rights/abilities to look at the network itself but can contact the Data center folks to look deeper into this but I wanted to make sure it's not my application that might be causing the slowdown or IIS. In summary: .NET 2.0 application works great in IIS 6.x Application moved to an IIS 7.5 server and now slow on rendering but when it does render responds back with pages instantly. Edit for solution Found out that it was the SOAP calls that were slowing the site down. In the new datacenter my application cannot request SOAP calls and so they time out after 40-45 seconds or so. Now trying to find out if I can install a proxy server to redirect this...

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• 500 Internal Server Error when setting up Apache on localhost

  - by Martin Hoe

  I downloaded and installed XAMPP, and to keep my projects nicely separated I want to create a VirtualHost for each one based on its future domain name. For example, in my first project (we'll say it's project.com) I've put this in my Apache configuration: NameVirtualHost 127.0.0.1 <VirtualHost 127.0.0.1:80> DocumentRoot C:/xampp/htdocs/ ServerName localhost ServerAdmin admin@localhost </VirtualHost> <VirtualHost 127.0.0.1:80> DocumentRoot C:/xampp/htdocs/sub/ ServerName sub.project.com ServerAdmin [email protected] </VirtualHost> <VirtualHost 127.0.0.1:80> DocumentRoot C:/xampp/htdocs/project/ ServerName project.com ServerAdmin [email protected] </VirtualHost> And this in my hosts file: # development 127.0.0.1 localhost 127.0.0.1 project.org 127.0.0.1 sub.project.org When I go to project.com in my browser, the project loads up successfully. Same if I go to sub.project.com. But, if I navigate to: http://project.com/register (one of my site pages) I get this error: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. The error log shows this: [Sun May 20 02:05:54 2012] [error] [client 127.0.0.1] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace., referer: http://project.com/ Sun May 20 02:05:54 2012] [error] [client 127.0.0.1] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace., referer: http://project.com/ Any idea what config items I got wrong or how to get this working? It happens on any page that's not in in the root directory of project.com. Thanks.

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• Tridion 2011 SP1 Core Service - expose to live server within PROD env

  - by Neil

  We have a requirement to allow our users to submit information about their "projects" - a small piece of text and single image they upload. Ultimately we'll have a listing page of user contributed projects that others can comment on and rate. We've decided to user Tridion's UGC for rating & comments site-wide for this first phase which has got me thinking - UGC is tied to Tridion published pages & components, if we want UGC on our user-submitted projects, they'll have to be created within Tridion as components themselves, not be sat in some custom db table? Is this where the Core Service could come in? My understanding is that the CD Web Service is for retrieval, not for interacting with the Content Manager. Is it OK (!) architecturally to expose the Core Service only to our live application servers so our backend .NET code can create "project components" that can be then be published by editors allowing them to be commented on? Everything sounds pretty neat and tidy apart from the "exposing Core Service to live servers" bit. Without this though I'd have to write a custom way to "transfer" it back over to the Content Manager - maybe like Audience Manager Sync works? Anyone done this before?

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• Using NFS for scalable PHP/MySQL web application

  - by Jeroen Moons

  Here's the situation: I have a PHP/MySQL web application that accepts user uploads (pdf files). From these pdf files' pages a preview image is made on the fly and presented to the web app's users. Some pdfs might be on the large side, most will be under 50 MB but some extreme cases could be as large as a few hundred MB. A little waiting for the preview image for large pdf files is acceptable but no more than a minute let's say. Everything is running on one server for now, but soon the app will hit the server's limit on both storage and processing power. My idea to solve the problem: To deal with this situation I had the idea of having one or more pdf processing servers as needed, and one or more file storage servers. These two types of servers are mounted to the server on which the actual app runs using NFS. The app could then use GearMan to delegate pdf processing tasks to these processing servers. The processing server can mount the storage server and read the file stored there, process it and write its output to that server. The servers I'm talking about will be amazon ec2 instances. The web app returns a link to the resulting pdf preview image on the storage server that was used which can then be used on the front end to show the image to the user. My question: I have zero experience with apps that use multiple servers, is this idea viable or is there a better way to do it? Is an NFS setup fast and reliable enough for this situation?

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• What is the sysadmin's dream network printer? 6-8k pg/mo. Xerox, OkiData, Lexmark and HP are all fail

  - by Jacob

  How do I find out what printer brand and/or type doesn't suck? This information is hard to find and manufacturer's websites won't reveal any issues with certain printers. After 10 years of dealing with network shared printers, I can't say that I have been impressed with any of the printer brands I've seen. Brother's little laser MFPs have been close to ideal for low volume, but that is it, period. OkiData, Lexmark, HP, Xerox solid ink printers, they all sucked in one way or another. Currently I'm looking to replace a Xerox ColorQube 8570 because it fails to print on a regular basis. Sometimes it doesn't even boot VxWorks fully - it just hangs at 2% or whatever. I've used Xerox 8860MFPs and they sucked just as bad. I won't talk about ink jets here, that's most likely not what I'm looking for. We currently spend about $4k on paper and ink per year for this printer at up to 6-8k pages per month, letter, mostly black and white, low color usage. I want the printer to feed paper correctly, not crash and burn when a PDF isn't according to its taste (my favorite Xerox problem here) and with decent drivers for Windows and OS X. Print quality is not of the utmost importance but paper does get sent to customers.

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• Loading a big database dump into PostgreSQL using cat

  - by RussH

  I have a pair of very large (~17 GB) database dumps that I want to load into postgresql 9.3. After installing the database packages, learning more or less how to use them, and fiddling around a little on various StackExchange pages (particularly this question), it looks like a proper command for me to use is something like: cat mydb.pgdump | psql mydb because of the format the dump is in. My machine has 16 GB of RAM, and I'm not familiar with the cat command but I do know that my RAM is 99% exhausted and the database is taking a while to load. My machine isn't non-responsive to the point of hanging; I can run other commands in other terminal windows and have them execute at a reasonable clip, but I am wondering if cat is the best way to pipe in the file or if something else is more efficient? My concern is that maybe cat could be using up all the RAM so the database doesn't have much to work with, throttling its performance. But I'm new to thinking about RAM issues like this and don't know if I'm worrying about nothing. Now that I think about it, this seems to be more of a question about cat and its memory usage than anything else. If there is a more appropriate forum for this question please let me know. Thanks!

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• Visual Studio 2010 won't compile/create new projects

  - by tuner

  My Visual Studio 2010 Professional with SP1 installed won't compile anymore. The shown error is: TRACKER : error TRK0005: Failed to locate: "CL.exe". The system cannot find the file specified. Strangely it is also not possible anymore to create new projects - the wizard appears but just restarts when I press create. As I found out the paths for Visual Studio are now built from settings in the registry. Namely HKEY_CURRENT_USER\Software\Microsoft\VisualStudio. Comparing a colleagues installation with mine revealed no different settings. So this is how the Property Pages/Configuration Properties/VC++ Directories look like: Executable Directories: $(ExecutablePath) Include Directories: $(IncludePath) Reference Directories: $(ReferencePath) Library Directories: $(LibraryPath) Source Directories: $(SourcePath) Exclude Directories: $(ExcludePath) From the Visual Studio 2010 Command Prompt, cl.exe is found. I can only guess that this behavior was caused by a reinstallation of Studio a couple of months ago (to a different folder). As we use an external build-script for our main project there is a good chance that it is broken since then. Any hints?

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• Does Antivirus2009 or Antivirus360 automatically install on your computer and if so how?

  - by sergey

  I run Firefox on Vista, and unfortunately I got tricked (through a deceptive google result) into going to a page containing one of those fake "Your Computer Has all of this Spyware on it!" pages. I tried manually closing the tab, but it had a "Are you sure you want to navigate away" JavaScript alerts (HATE THOSE). So I clicked "OK," and the tab closed. Then I closed firefox altogether and rebooted. Now, before I could close the tab, it did prompt me to download a file, but of course I choose not to, and checking my downloads folder, nothing new is there. Also, even if I ?did? download it, ?I? would still have to choose to run it by double clicking on it for it to install itself, right? Also, I ran Malware Bites and Windows Defender and both said everything was fine. From this I would normally believe I am safe, but I have read everywhere that this thing "automatically installs" itself and that it is a bitch to get rid of. Is it really possible for this thing to dig in if you are running firefox and didn't choose to download it or run it after downloading?

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• Preventing DDOS/SYN attacks (as far as possible)

  - by Godius

  Recently my CENTOS machine has been under many attacks. I run MRTG and the TCP connections graph shoots up like crazy when an attack is going on. It results in the machine becoming inaccessible. My MRTG graph: mrtg graph This is my current /etc/sysctl.conf config # Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 1 # Controls whether core dumps will append the PID to the core filename # Useful for debugging multi-threaded applications kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Controls the maximum size of a message, in bytes kernel.msgmnb = 65536 # Controls the default maxmimum size of a mesage queue kernel.msgmax = 65536 # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 net.ipv4.conf.all.rp_filter = 1 net.ipv4.tcp_syncookies = 1 net.ipv4.icmp_echo_ignore_broadcasts = 1 net.ipv4.conf.all.accept_redirects = 0 net.ipv6.conf.all.accept_redirects = 0 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.all.rp_filter = 1 net.ipv4.tcp_max_syn_backlog = 1280 Futher more in my Iptables file (/etc/sysconfig/iptables ) I only have this setup # Generated by iptables-save v1.3.5 on Mon Feb 14 07:07:31 2011 *filter :INPUT ACCEPT [1139630:287215872] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1222418:555508541] Together with the settings above, there are about 800 IP's blocked via the iptables file by lines like: -A INPUT -s 82.77.119.47 -j DROP These have all been added by my hoster, when Ive emailed them in the past about attacks. Im no expert, but im not sure if this is ideal. My question is, what are some good things to add to the iptables file and possibly other files which would make it harder for the attackers to attack my machine without closing out any non-attacking users. Thanks in advance!

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• My Ruby on Rails application only works if the address contains the port

  - by True Soft

  I have a Ruby on Rails application that works ok on my notebook ( http://localhost:3000/ ) I uploaded it on my hosting server, created with CPanel X an application, the URL is http://example.com:12007/ created a rewrite from http://example.com/ to http://example.com:12007/, and started it. If I write in my browser http://example.com:12007/ or http://www.example.com:12007/ all the pages work as expected. But if I write http://example.com/ or http://www.example.com/ the first page is displayed, but without any css or images (just like it wouldn't find them). I can see all the text (even the text from my MySQL database), but with no format. And if I click on any link, I get a error page like this: Not Found The requested URL /some_controller was not found on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. What should I do to make my website work without writing the port in the address bar? The content of my /public_html/.htaccess file is RewriteEngine on RewriteCond %{HTTP_HOST} ^example.com$ [OR] RewriteCond %{HTTP_HOST} ^www.example.com$ RewriteRule ^/?$ "http\:\/\/127\.0\.0\.1\:12007%{REQUEST_URI}" [P,QSA,L] which I guess was generated by CPanel Rewrites.

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• 'Bug in Mailman version 2.1.12'

  - by davorg

  I'm working on setting up a server running Plesk 10.4.4 Update #13 on Centos 6.2. I've configured Mailman and now I want to set up some mailing lists. I've created a list in the Plesk control panel, but when I try to administer the new list (by visiting http://lists.[domain].com/mailman/admin/[listname] I see the following error: Bug in Mailman version 2.1.12 We're sorry, we hit a bug! Please inform the webmaster for this site of this problem. Printing of traceback and other system information has been explicitly inhibited, but the webmaster can find this information in the Mailman error logs. I see exactly the same error if I try to go to the list info page at http://lists.[domain].com/mailman/listinfo/[listname]. I would follow the instructions and look in the error logs, but I can't find them. I would expect to find a file at /var/log/mailman/error, but there's nothing there. My test list seems to work correctly. It sends all the expected email. It's just the web pages for the list that seem to be broken. Has anyone else seen this? Any suggestions for tracking down and fixing the problem? p.s. I think I've chosen the correct Stack Exchange site, but it this question would be better asked elsewhere, please let me know. Update: I got to the bottom of this, so I'm documenting the answer in case anyone else has the same problem. The fact that I couldn't find the error log was the clue. The problem was that the Mailman process didn't have permissions to create an error log. And it seems that if Mailman can't create an error log then it will respond to any web request with this error page. Creating an error log file (in /var/log/mailman/error) and giving it the correct permissions fixed the problem.

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• Deploying ASP.NET MVC to Windows Server 2003

  - by pete the pagan-gerbil

  Hi, I have a problem with an MVC 2 website on Windows Server 2003 running IIS 6. It is externally hosted, but we have a 2003 server internally for testing. The internal server runs the website fine, the external server gives a 403 ("website declined to show this page") error when navigating to the root of the site, and a 404 if I try to navigate directly to a page resource. I have tried the wildcard ISAPI mapping and extension mapping, and a couple of other common checks (I forget exactly which now, most of them were already set correctly), but so far no joy. All the settings can be replicated on our internal server and the pages return properly. IIS logs just show exactly what the browser shows - 404 errors and 403s. I've read about a different level of trust required for an MVC application compared to a WebForms application - how can I check permissions and trust levels on the external and internal servers (assuming I am able to check that) and if that would cause these errors, what are the minimum levels that MVC require? Failing that, what else might be causing this error for me to try out?

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• Site hanging in iis7 - how do I troubleshoot?

  - by Chris Foot

  I am currently having a problem with a windows 2008 server running IIS 7. The server runs several sites but only seems to have the issue with one particular site. Every so often, the whole server slows to a crawl with nearly all requests timing out! Invariably, when we log in to take a look there is always an IIS process using up around 90% cpu. Looking into the worker processes in IIS there are usually one or two requests that have been running for a long time. They are always in the ExecuteRequestHandler state with ManagedPipeline as the module name and the current ones i'm looking at have been running for 7686248 (what units is this in, it doesn't say?). It is also not always the same page, in fact we have seen at least 3 different pages listed under url when this has happened. It seems that the only way to bring the server back to life is to kill the 90% process! The site is running under .Net 4.0 and the code on it is very similar to other sites on the server which do not have the problem! How do I start troubleshooting this?

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• Problem Uninstalling Microsoft Internet Explorer

  - by Roger F. Gay

  On Windows Vista Home Premium (x64) I am trying to uninstall Microsoft Internet Explorer. The procedures explained all over the web involve going through the control panel to Programs and Features. If MSIE is listed there, then uninstall in the usual way. If it is not listed there, click Turn Windows features on and off and deactivate it there. But Internet Explorer is not listed in either place. Background: I initiated some process in MSIE a couple of months ago that caused all web pages to no longer save login information or remain logged in when requested. As you can tell from the way I described that, I don't remember what it was and have no way to simply reverse it. I had a few problems with .NET Framework as well. So, I've uninstalled all browsers except MSIE and uninstalled .NET Framework. I've reinstalled .NET Framework and all other browsers. I have not been able to uninstall MSIE. Have Tried: I tried installing over the existing installation, but auto-update must be keeping it nicely up to date. The attempt simply produced an information window telling me that my current version is more up-to-date than the new version I tried to install.

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