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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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• Extract number with regex

  - by Joey

  I have this string: > HTTP/1.1 200 OK Date: Tue, 12 Nov 2013 15:26:17 GMT Server: > Apache/2.2.3 (CentOS) Last-Modified: Fri, 08 Nov 2013 21:34:50 GMT > ETag: "452//path/to/file" > Accept-Ranges: bytes Content-Length: 26010 Connection: close > Content-Type: text/plain; charset=UTF-8 And would like to extract 452 which is before // and after ETag, what regex to use? I am stuck. Thanks a lot

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• How to configure bind9 to route to host's IP

  - by Greg

  I'm running apache and bind9 on the same server. I would like to set a master zone to route back to this very machine's IP address without explicitly specifying it. Is this possible? If I use 127.0.0.1 for the A record, then when another computer on the network does an nslookup for mydomain.local, bind of course just returns the loopback ip (127.0.0.1) -- not the IP of the server. Is there to way to tell it to just return the network IP address for the server itself, as defined in /etc/network/interfaces?

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• Webserver security, intrusion detection, and file intregrity

  - by enfield

  I would like to add some type of tracking / alerting on some linux webservers running PHP and Apache. In doing searches I have come across a lot of info from 2006-2009. Would like to revisit things and see what others are doing now. The main purpose here is to track when any files are changed and if so alert me somehow. The same goes for IDS and hopefully something that can reside on same server? Since some of these are small scale projects I would prefer opensource/free solutions that are really effective. Although I would still like to hear of other alternatives if someone has the experience and the cost can be justified.

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• Trying to test Domain Collapsing / Consoldiation validity for SEO purposes

  - by Roy Rico

  At work, we're trying to determine the effectiveness of domain collapsing for SEO purposes. Our current structure is to have multiple web apps served from different servers, such as PUBLIC URLS - directly accessed by users www1.somecompany.com/webapp1 www2.somecompany.com/webapp2 www3.somecompany.com/webapp3 I'm proposing to put an Apache proxy in front of these applications that will mask the different domains and route the requests to proper server PUBLIC URL--------routed/forwarded to-----PRIVATE URL www.somecompany.com/webapp1 <-----> www1.somecompany.com/webapp1 www.somecompany.com/webapp2 <-----> www2.somecompany.com/webapp2 www.somecompany.com/webapp3 <-----> www3.somecompany.com/webapp3 In terms of SEO/page rank value, does this help?

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• How to configure nginx to serve static contents from RAM?

  - by Vijayendra Tripathi

  I want to set up nginx as my web server. I want to have image files cached in the memory (RAM) rather then disk. I am serving a small page and want few images always served from RAM. I dont wish to use varnish (or any other such tools) for this as I believe nginx has a capability to cache contents into RAM. I am not sure as how may I configure nginx for this? I did try few combinations but they didn't work. nginx uses disk all the time to get images. For example, when I tried apache benchmark to test with following command - ab -c 500 -n 1000 http://localhost/banner.jpg I get following error - socket: Too many open files (24) I guess this means nginx is trying to open to many files simultaneously from the disk and OS is not allowing this operation. Can anyone please suggest me a correct configuration? Thanks for considering this message.

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• Invalid operation dist-ugprade

  - by drdarwin

  i'm running Apache 2 on Debian at my VPS. Naturally i have problem with restricted GD-library of my php package and i need to fix it (i need imagerotate() function). Before installing php-gd pugin it's necessary to update php 5.2 to php 5.3 my /etc/apt/sources.list is: #deb http://ftp.ru.debian.org/debian/ lenny main contrib non-free #deb http://security.debian.org lenny/updates main contrib non-free #deb http://ftp.ru.debian.org/debian lenny main #deb-src http://volatile.debian.org/debian-volatile lenny/volatile main contrib deb http://packages.dotdeb.org stable all deb-src http://packages.dotdeb.org stable all The problem comes after apt-get dist-ugprade executing: /$ apt-get update Hit http://packages.dotdeb.org stable Release.gpg Hit http://packages.dotdeb.org stable Release Ign http://packages.dotdeb.org stable/all Packages/DiffIndex Ign http://packages.dotdeb.org stable/all Sources/DiffIndex Hit http://packages.dotdeb.org stable/all Packages Hit http://packages.dotdeb.org stable/all Sources Reading package lists... /$ apt-get dist-ugprade E: Invalid operation dist-ugprade What can cause this problem? How much should i wait while Reading package lists...? Is there any simple guideline for further php-gd installation?

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• thought on real time web analytics

  - by Linus

  we have a few web servers and am planning to create a dashboard to show the real time stats ip address,geo-location and other custom data based on database lookups. Splunk sort of fits perfectly but wondering if there are any open source alternative . i have looked at logstash and graylog2, but to my knowledge they are more of a log analysis tools. Piwik is sort of interesting except that i cannot put any javascript on the webpages. All i have access to is apache web log. Any recommendations please..

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• Improving server security [closed]

  - by Vicenç Gascó

  I've been developing webapps for a while ... and I always had a sysadmin which made the environment perfect to run my apps with no worries. But now I am starting a project on myself, and I need to set up a server, knowing near to nothing about it. All I need to do is just have a Linux, with a webserver (I usually used Apache), PHP and MySQL. I'll also need SSH, SSL to run https:// and FTP to transfer files. I know how to install almost everything (need advice about SSL) with Ubuntu Server, but I am concerned about the security topic ... say: firewall, open/closed ports, php security, etc ... Where can I found a good guide covering this topics? Everything else in the server... I don't need it, and I wanna know how to remove it, to avoid resources consumption. Final note: I'll be running the webapp at amazon-ec2 or rackspace cloud servers. Thanks in advance!!

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• *nix OS that is easy to update to latest software

  - by rjstelling

  I need to configure a server (*nix) that runs our (bespoke) CMS and Applications. In the past I have defaulted to using Cent OS 5, but I find this outdated difficult to upgrade the software to the versions we require. For example, we need PHP 5.3, but CentOS 5 has 5.2. Updating is fine but breaks something else (normally MySQL support in PHP). Eventually it will get to a situation where I can't upgrade because of missing dependancies and incompatible versions. Error: Missing Dependency: httpd = 2.2.3-43.el5.centos.3 is needed by package httpd-devel-2.2.3-43.el5.centos.3.i386 (updates) Is there a better alternative OS for hassle free updates, I need: Apache 2.2.17 (the development version for apxs) MySQL 5.5.8 PHP 5.3.5

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• Automatic Site Creation

  - by Eddy Freeman

  I have created a platform that i want users to sign up and a new site is created for them instantly. Users will register and afterwards they will receive a username and password for their personal site. The system will work like ecommerce platforms such as www.shopify.com, www.bigcommerce.com, etc.. where users sign up and a new web-shop is created for them instantly. I have been searching for a while how i can create a script to automate this task but couldn't find any tutorials. Am using LAMP (Linux, Apache, MySql and PHP). Am asking if someone can guide me how to write such script or maybe point me to a tutorial or a book or probably similar scripts to automate this task. Sorry if this place is wrong for this question. thanks for your help.

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• How do I identify which rewrite rule is being trigger on IIS 7.5?

  - by Jordan Reiter

  I have a set of rewrite rules (offhand, I would say around 40-50) for a given server. It's basically to handle and reroute mangled URLs so that bad links still go to where they're supposed to go. I've come across an URL that is redirecting and I can't figure out which rewrite rule it is applying. My background is Apache and in that case I'd simply enable a rewrite log and look at the logged output to figure out what was happening. Is there an equivalent way to do this in IIS? bonus round Any way for me to view & edit the rewrite rules in a text file rather than the GUI interface?

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• How to calculate time spent for Linux system administration?

  - by Jaakko

  I would love figuring out how much time I actually have spent in shell performing administrative duties. For billing of course, this information is not sufficient, but it would be helpful to figure out how much time I have actually spent in shell. My question is: How anyone got tips on how to calculate time spent in shell (in hours + minutes), let's say per user account? Could anyone recommend a software that could be used to analyze this time? Optionally I would like to know about ways how to categorise time spent (e.g. 1 hour for Apache, 2 hours for Samba, etc.) Also, your takes on how you monitor your admin time, are also much appreciated! To narrow down the problem, I am specifically interested in ways of tracking time spent in shell for Linux system administration

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• puppet service not stopping service

  - by Gregg Leventhal

  notice ("This should be echoed") service { "iptables": ensure => "stopped", } This does not stop iptables, I am not sure why. service iptables stop works fine. Puppet 2.6.17 on CentOS 6.3. UPDATE: /etc/puppet/manifests/nodes.pp node 'linux-dev' { include mycompany::install::apache::init include mycompany::config::services::init } /etc/puppet/modules/mycompany/manifests/config/services/init.pp class mycompany::config::services::init { if ($::id == "root") { service { 'iptables': #name => '/sbin/iptables', #enable => false, #hasstatus => true, ensure => stopped } notice ("IPTABLES is now being stopped...") file { '/tmp/puppet_still_works': ensure => 'present', owner => root } else { err("Error: this manifest must be run as the root user!") } }

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• How does the build quality of laptops compare?

  - by pgwillia

  I'm looking to replace my 5 year old laptop. I want my next laptop to endure at least this long. I typically have Thunderbird, Firefox, Eclipse Java IDE, Skype, a ssh session, and Apache Tomcat running. I'm currently running Karmic Ubuntu, but am agnostic about operating system and would move to Win 7 or OS X. I frequently travel with this computer. I also value battery longevity and power conservation (if possible). Above all I'm looking to minimize cost. I think the hardware that best meets my needs is an Intel i7 processor, 8 GB RAM, 100GB @7200 rpm or SSD hardrive, and about 15 inch monitor. These specs are met by most brands. Does anyone know specific pros/cons and build quality for Macbook Pro, Lenovo Thinkpad (W510 or T510), Sony's VPC-F1190, and ASUS G Series G73JH-X1 NoteBook? Are all i7 processors created equal? Do you have other suggestion that meet my needs?

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• (Open Source) Cloud-Filesystem to run a Database on Top?

  - by jens

  Hello, what are current "technologies and implementations" to get a filesystem with unlimited capacity by using single servers with their harddisk to form a "grid/cloud filesystem"? I need to have unlimited space (by adding further servers) but it must be a filesysem that is capable of running a database on top. I know of Apache Hadoop but that seems not be be Ideal for running a DB on top of it (or am I wrong??) And iSCSI seems to be "remote/networked" but I do not know how and if this is clusterable? thank you very much!! jens

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• (Open Source) Cloud-Filesystem to run a Database on Top?

  - by jens

  Hello, what are current "technologies and implementations" to get a filesystem with unlimited capacity by using single servers with their harddisk to form a "grid/cloud filesystem"? I need to have unlimited space (by adding further servers) but it must be a filesysem that is capable of running a database on top. I know of Apache Hadoop but that seems not be be Ideal for running a DB on top of it (or am I wrong??) And iSCSI seems to be "remote/networked" but I do not know how and if this is clusterable? thank you very much!! jens

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• Running a defect php file cause error 500

  - by John Brunner

  When I address a PHP file, I always get an error 500. I've looked up the logs of my Apache server, and this displays that some includes etc. in the PHP file address files which don't exist on the server. They don't exist because I'm just testing my PHP file. But could it be achieved that the server runs the php file in every case, even when something is wrong? Every 30 seconds an entry is made in the error_log file which says [Sat Jun 09 17:55:07 2012] [error] [client 10.224.55.160] File does not exist: /var/www/html/index.html ... but there IS an index.html?!

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• Limit HTTP VERBS on Apache2

  - by user72295

  I am trying to limit the use of certain HTTP verbs on my site. I entered the following into my VirtualHost config file within the Directory element: <Limit GET POST HEAD> Allow from all </Limit> <Limit PUT DELETE OPTIONS> Deny from all </Limit> This seemed to work but with unexpected results: I ran the following telnet/HTTP commands before and after this change, open server 80 OPTIONS server/abs_path HTTP/1.1 User-Agent: Telnet/1.0 Host: server before the change I received a successful response with the Allowed headers. After the change, however, I was expecting to receive a 405 'Method not allowed' response but rather I received a 403 'Access Forbidden' response. What do I need to change in apache to return the 405 HTTP response? Many thanks

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• Purpose of LAN Domain?

  - by Leonard Thieu

  What is the purpose of creating a domain name for your LAN? I'm using DD-WRT on my router and assigned local.moofz.com as the LAN domain. I setup Apache HTTP servers on two of the computers on my LAN to test it out. I could reach them on oneil.local.moofz.com and vala.local.moofz.com, but I found out that I could also reach them via their hostnames oneil and vala. If I can reach them through their host names, then what would be the purpose of having a domain name for my LAN?

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• Making TT-RSS cache images

  - by Piku

  Due to Google Reader's untimely demise, I've installed tiny-tiny RSS on my Linux machine under Apache 2. It's mostly a good enough replacement and I can at least go back to reading RSS feeds in my web browser at work. Can I configure or hack TT-RSS to cache all the images it finds in its feeds? There is an option when adding a feed, but it doesn't seem to actually do anything. If I view (for example) today's XKCD comic in TT-RSS it still loads the image from the XKCD website. What I want is the image to be cached in TT-RSS and served from there instead.

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• Blocking a country (mass iP Ranges), best practice for the actual block

  - by kwiksand

  Hi all, This question has obviously been asked many times in many different forms, but I can't find an actual answer to the specific plan I've got. We run a popular European Commercial deals site, and are getting a large amount of incoming registrations/traffic from countries who cannot even take part in the deals we offer (and many of the retailers aren't even known outside Western Europe). I've identified the problem area to block a lot of this traffic, but (as expected) there are thousands of ip ranges required. My question now (finally!). On a test server, I created a script to block each range within iptables, but the amount of time it took to add the rules was large, and then iptables was unresponsive after this (especially when attempting a iptables -L). What is the most efficient way of blocking large numbers of ip ranges: iptables? Or a plugin where I can preload them efficiantly? hosts.deny? .htaccess (nasty as I'd be running it in apache on every load balanced web server)? Cheers

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• Connection timed out exception, why?

  - by Dheeraj Kumar Aggarwal

  I am developing an application which uses embedded tomcat server 7, and deploys a web application on embedded server. My application accesses the embedded webapp through Rest APIs, but my clients are getting Connection Timed Out exceptions and port is also not blocked. I never gets this exception when I install this application on my local machine. Some points: IP address is used in the host name part (They are able to access this IP address on other port) Port is not blocked We are using Apache HttpClient library to access the URL Timeout interval seems not to be an issue. What are the possible reasons for this exception Connection Timed Out? or How can I simulate this problem on my local machine? Any pointers would be helpful.

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• apc.stat causes 500 internal server error

  - by Legit

  When I turn off apc.stat it causes a 500 internal server error. I checked the apache error_log and it's something about: [Tue Jun 26 10:02:59 2012] [error] [client 127.0.0.1] PHP Warning: require(): Filename cannot be empty in /var/www/site1/public/index.php on line 17 [Tue Jun 26 10:02:59 2012] [error] [client 127.0.0.1] PHP Fatal error: require(): Failed opening required '' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/site1/public/index.php on line 17 I checked that line and here's what it contains: require('./wp-blog-header.php'); I don't see anything wrong with it. Here's my current APC config: APC version: 3.1.10 PHP Version: 5.4.4 How do I resolve this error when i disable apc.stat?

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• How can I configure TomCat Java options in a config file?

  - by Kip

  I'm trying to configure Java options passed into TomCat for a 3rd party application that I'm deploying. The instructions that the app provides are: Open the Tomcat configuration tool from the Windows menu at Start All Programs Apache Tomcat Tomcat Configuration. Click Configure and select the Java tab. At the bottom of the Java Options field, enter the following: -Dexample.license.directory="C:\Program Files\example" Stop and restart the application server. However, I need to do this programmatically, so I'd like to know what config file these options can be set in. Using the GUI is impractical for deploying the app to other developers' environments. (I'm using Tomcat 6.0 if that is relevant...)

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