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• How do you cache web pages with a personalized header using caching reverse proxy such as Squid, Var

  - by Continuation

  Pretty much every page of my website is dynamically generated. However they don't change that frequently (kinda similar to a forum page). So I'd like to cache them using a caching reverse proxy such as Squid, varnish or Nginx. The problem is that for my logged-in users, each of them will see a personalized header saying "Welcome John Doe. Logout" on the upper right corner of the page (just like serverfault). While users who aren't logged in will see a header that says "Login" instead. So basically even though every user will see the same page in general, they all slightly different version due to that personalized header. Is there any way so that I can cache the "main" part of the page and serve it from cache while generate the personalized header dynamically for each individual user? This must be a very common problem. How is it solved in general?

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• SNMP counter issues with cisco RV082

  - by Chance

  Does anyone else poll this router with SNMP? We are using firmware version: 2.0.0.19-tz We are having problems with the traffic counters, some of them appear to be implemented as 16 bit counter instead of 32 bit counters. The reason this is causing problems is that they roll over (at 65,000) to 0 in less than our minute polling cycle, really skewing our metrics. The counter for the Lan (interface 2) seems to be functioning properly, however interfaces 3 and 4 (WAN and DMZ / WAN2) rollover at 65000. Tue May 11 08:38:31 EDT 2010 IF-MIB::ifInOctets.1 = Counter32: 137634 IF-MIB::ifInOctets.2 = Counter32: 1865677943 IF-MIB::ifInOctets.3 = Counter32: 12450 IF-MIB::ifInOctets.4 = Counter32: 49354 Look at counter IF-MIB::ifInOctets.4 5 seconds later: Tue May 11 08:38:36 EDT 2010 IF-MIB::ifInOctets.1 = Counter32: 137634 IF-MIB::ifInOctets.2 = Counter32: 1865836207 IF-MIB::ifInOctets.3 = Counter32: 13167 IF-MIB::ifInOctets.4 = Counter32: 12900 Any suggestions? Seems like a bug to me, however I just wanted to make sure I wasn't crazy.. Thanks!

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• How can I keep a file in Windows 7's cache?

  - by netvope

  Sometimes you know better than Windows what files will be re-used later. Suppose you have 8GB of memory, and you use the same 1GB file every hour in an I/O-bound application (which takes 1 second to finish if the file is cached, and 1 minute if not.) Now you process some other 16GB of data that are not going to be re-used. Naturally the frequently used 1GB file will be pushed out of the cache. It would be beneficial if one can tell Windows to keep that 1GB file in memory. (Better yet, it would be great if I can tell Windows not to cache those 16GB of data, but I'm not optimistic that this can be done.) The poor-man's way to keep a file in the cache would be to keep reading the file. Are there any better ways? Are you aware of any programs that do this? (If this can be easily done under Linux, please let me know too.)

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• How to invalidate nginx reverse proxy cache in front of other nginx servers?

  - by Olivier Lance

  I'm running a Proxmox server on a single IP address, that will dispatch HTTP requests to containers depending on the requested host. I am using nginx on the Proxmox side to listen to HTTP requests and I am using the proxy_pass directive in my different server blocks to dispatch requests according to the server_name. My containers run on Ubuntu and are also running a nginx instance. I'm having troubles with caching on a particular website that is fully static: nginx keeps on serving me stale content after files updates, until I: Clear /var/cache/nginx/ and restart nginx or set proxy_cache off for this server and reload the config Here's the detail of my configuration: On the server (proxmox): /etc/nginx/nginx.conf: user www-data; worker_processes 8; pid /var/run/nginx.pid; events { worker_connections 768; # multi_accept on; use epoll; } http { ## # Basic Settings ## sendfile on; #tcp_nopush on; tcp_nodelay on; #keepalive_timeout 65; types_hash_max_size 2048; server_tokens off; # server_names_hash_bucket_size 64; # server_name_in_redirect off; include /etc/nginx/mime.types; default_type application/octet-stream; client_body_buffer_size 1k; client_max_body_size 8m; large_client_header_buffers 1 1K; ignore_invalid_headers on; client_body_timeout 5; client_header_timeout 5; keepalive_timeout 5 5; send_timeout 5; server_name_in_redirect off; ## # Logging Settings ## access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; ## # Gzip Settings ## gzip on; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; gzip_vary on; gzip_proxied any; gzip_comp_level 6; # gzip_buffers 16 8k; gzip_http_version 1.1; gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; limit_conn_zone $binary_remote_addr zone=gulag:1m; limit_conn gulag 50; ## # Virtual Host Configs ## include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } /etc/nginx/conf.d/proxy.conf: proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_hide_header X-Powered-By; proxy_intercept_errors on; proxy_buffering on; proxy_cache_key "$scheme://$host$request_uri"; proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=cache:10m inactive=7d max_size=700m; /etc/nginx/sites-available/my-domain.conf: server { listen 80; server_name .my-domain.com; access_log off; location / { proxy_pass http://my-domain.local:80/; proxy_cache cache; proxy_cache_valid 12h; expires 30d; proxy_cache_use_stale error timeout invalid_header updating; } } On the container (my-domain.local): nginx.conf: (everything is inside the main config file -- it's been done quickly...) user www-data; worker_processes 1; error_log logs/error.log; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; #tcp_nopush on; keepalive_timeout 65; gzip off; server { listen 80; server_name .my-domain.com; root /var/www; access_log logs/host.access.log; } } I've read many blog posts and answers before resolving to posting my own questions... most answers I can see suggest setting sendfile off; but that didn't work for me. I have tried many other things, double checked my settings and all seems fine. So I'm wondering whether I am not expecting nginx's cache to do something it's not meant to...? Basically, I thought that if one of my static files in my container was updated, the cache in my reverse proxy would be invalidated and my browser would get the new version of the file when it requests it... But I now have the sentiment I misunderstood many things. Of all things, I now wonder how nginx on the server can know about a file in the container has changed? I have seen a directive proxy_header_pass (or something alike), should I use this to let the nginx instance from the container somehow inform the one in Proxmox about updated files? Is this expectation just a dream, or can I do it with nginx on my current architecture?

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• How to make sure clients update their browser cache when my website is updated?

  - by user64204

  I am using the HTTP 1.1 Cache-Control header to implement client-side caching. Since I update my website only once a month I would like the CSS and JS files to be cached for 30 days with Cache-Control: max-age=2592000. The problem is that the 30-day period defined by Cache-Control doesn't coincide with the website update cycle, it starts from the moment the users visit the site and ends 30 days later, which means an update could occur in the meantime and users would be running with outdated content for a while, which could break the rendering of the website if for instance the HTML and CSS no longer match. How can I perform client-side caching of content for periods of several days but somehow get users to refresh their CSS/JS files after the website has been updated? One solution I could think of is that if website updates can be schedule, the max-age returned by the server could be decreased every day accordingly so that no matter when people visit the website, the end of caching period would coincide with the update of the website, but changing the server configuration every day goes against one of my sysadmin principles (once it's running, don't touch it).

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• Apache Cache with multiple CacheRoots

  - by Tobias Greitzke

  I configured Apache with a CacheRoot directory for each of my domains / virtual hosts: <VirtualHost> ServerName domain1.tld ... CacheRoot /var/www/vhosts/domain1.tld/httpdocs/cache ... </VirtualHost> <VirtualHost> ServerName domain2.tld ... CacheRoot /var/www/vhosts/domain2.tld/httpdocs/cache ... </VirtualHost> I have this up and running for quite a while and so fare it's working pretty well except that I have to empty out the cache manually every so often because htcacheclean does't know of the different directories. Now I would like to setup htcacheclean to watch over the cache directories but as fare as I understand the manual, I can only set it to one cache directory. I would like to do something like this but that doesn't work: <VirtualHost> ServerName domain1.tld ... CacheRoot /var/www/vhosts/domain1.tld/httpdocs/cache htcacheclean -n -t -p/var/www/vhosts/domain1.tld/httpdocs/cache -l1024M ... </VirtualHost> Is it even right to have multiple cache directorys or should I work with just one cache directory for all of the domains?

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• 2 ways to do the same in relation to output cache?

  - by Timmy O' Tool

  On the origin server I have the following caches: http.sys, IIS output cache, asp net output cache, etc Do these two options do the same? (disable ONLY the asp net output cache) <caching> <outputCache enableOutputCache="false"> </outputCache> </caching> and response.Cache.SetNoServerCaching();

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• Counter that will remember it's value

  - by owca

  I have a task to operate on complex number. Each number consists of double r = real part, double i = imaginary part and String name. Name must be set within constructor, so I've created int counter, then I'm sending it's value to setNextName function and get name letter back. Unfortunately incrementing this 'counter' value works only within costructor and then it is once again set to 0. How to deal with that?Some constant value? And second problem is that I also need to provide setNextNames(char c) function that will change the counter current value. The code : public class Imaginary { private double re; private double im; private String real; private String imaginary; private String name; private int counter=0; public Imaginary(double r, double u){ re = r; im = u; name = this.setNextName(counter); counter++; } public static String setNextName(int c){ String nameTab[] = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N", "O","P","Q","R","S","T","U","W","V","X","Y","Z"}; String setName = nameTab[c]; System.out.println("c: "+c); return setName; } public static String setNextName(char c){ // //don't know how to deal with this part // }

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• jQuery - Increase the value of a counter when a button is clicked

  - by Taimur

  Hi, I'm making a system where a user clicks a button and their score increases. There is a counter which I would like to increase the value of using jQuery (so that the page does not need to refresh) when the button is clicked. How would I go about this? <script type="text/javascript" src="http://code.jquery.com/jquery-1.4.3.min.js"></script> <script type="text/javascript"> $("#update").click(function() { $("#counter")++; } </script> #update is the button, #counter is the counter. In php, ++ increases something's value. What's the jQuery equivalent? Also, when the button is clicked, it needs to send a request which updates the score value in a mysql database as well, without the page refreshing. Does anyone know how I would do that? Thanks a lot UPDATE: I've tried a few of the methods below, but nothing seems to work! Do I need to change anything else for it to work? I've created a test page for it: <html> <body> <script type="text/javascript" src="http://code.jquery.com/jquery-1.4.3.min.js"></script> <script type="text/javascript"> var count = 0; $("#update").click(function() { count++; $("#counter").html("My current count is: "+count); } </script> <button id="update" type="button">Button</button> <div id="counter">1</div> </body> </htlm>

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• Linux - How to control Winbind Authentication cache timeout

  - by cybervedaa

  I have configured my linux machines (running CentOS 5.2) to authenticate against a Windows server running Active Directory. I have even enabled winbind offline logon. Everything works as expected, however I'm also looking to impose a TTL for the winbind authentication cache. So far all I found was the below snippet from the samba documentation winbind cache time (G) This parameter specifies the number of seconds the winbindd(8) daemon will cache user and group information before querying a Windows NT server again. **This does not apply to authentication requests**, these are always evaluated in real time unless the winbind offline logon option has been enabled. Default: winbind cache time = 300 Clearly the winbind cache time parameter does not control the cache TTL for authentication requests. Is there any other way I can implement a cache timeout for winbind authentication requests? Thank you

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• How to download media content on demand and reuse from browser cache in silverlight

  - by Andrew

  Hi. I have a problem with simple silverlight app, this app has a couple of buttons, each button sets mediaelement source to a short mp3 file and plays it, my problem is that when i press the same button second time it re-downloads mp3 file again but i think it shouldn't, instead it should use a copy of browser cached mp3 file that was downloaded when a button was pressed for the first time. I'm using sl4 and links in mediaelement are just simple uri's, i need to make it working in this way that when some mp3 was downloaded it will be cached on the client browser and further click on button will use a cached version of file instead of downloading it again and wasting my bandwidth. Any ideas ?

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• Best way to cache resized images using PHP and MySQL

  - by Chris Hawes

  What would be the best practice way to handle the caching of images using PHP. The filename is currently stored in a MySQL database which is renamed to a GUID on upload, along with the original filename and alt tag. When the image is put into the HTML pages it is done so using a url such as '/images/get/200x200/{guid}.jpg which is rewritten to a php script. This allows my designers to specify (roughly - the source image maybe smaller) the file size. The php script then creates a hash of the size (200x200 in the url) and the GUID filename and if the file has been generated before (file with the name of the hash exists in TMP directory) sends the file from the application TMP directory. If the hashed filename does not exist, then it is created, written to disk and served up in the same manner, Is this efficient as it could be? (It also supports watermarking the images and the watermarking settings are stored in the hash as well, but thats out of scope for this.)

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• Gravatar server cache

  - by Santa

  Does anyone know how and when Gravatar refreshes their icon caches? I changed my gravatar image for an email about a week ago. For the most part, my profiles that use it have had their avatar icons of various sizes refreshed, except one. In particular, the following URIs, while using the exact same email hash, fetch two completely different images: http://www.gravatar.com/avatar/73166d43fc3b2dc5f56669ce27984ad0?d=identicon&s=35 http://www.gravatar.com/avatar/73166d43fc3b2dc5f56669ce27984ad0?s=35&d=identicon

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• How do I use the subversion revision of a css file to prevent browser cache

  - by Clayton

  StackOverflow implements it like this: <link rel="stylesheet" href="http://sstatic.net/so/all.css?v=4542"> Every time the referenced files change, the href attribute of the link tag is updated in the HTML code, thus supporting caching and updated referenced files. My question - how do you retrieve the subversion version of that css file to include in the link? Subversion keywords only tell you the revision of the file you are currently in. I'm working with PHP/CodeIgniter + jQuery.

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• Is this a cache problem? (JQUERY/OPERA)

  - by Scarface

  Hey guys quick question. I have this code that brings in data from a php script and it works fine in fire fox and mostly opera except one problem. In opera if I keep refreshing the page, once in a while the information will not appear at all. Is this possible to fix? Thanks in advance for any assistance. $.getJSON(files+"comments.php?action=view&load=initial&topic_id="+topic_id+"&t=" + (new Date()), function(json) { if(json.length) { for(i=0; i < json.length; i++) { $('#comment-list').prepend(prepare(json[i])); $('#list-' + count).fadeIn(1500); } } });

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• phpThumb cache problems

  - by Cabeludo

  I'm using phpThumb - the PHP thumbnail generator. 'phpThumb.config.php': $PHPTHUMB_CONFIG['cache_maxage'] = 10; $PHPTHUMB_CONFIG['cache_maxsize'] = 1000; $PHPTHUMB_CONFIG['cache_maxfiles'] = 10; but it does nothing... I've got 108 MB in 922 files... and it keeps growing. Thanks for any suggestions.

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• Disabling price cache in UberCart?

  - by RD

  How do you disable the caching of selling price in UberCart?

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• Cache Auth Tokens (or Caching HTTP headers in General) - Best Practices

  - by viatropos

  I'm using the Ruby GData Library to access Google Docs and I recently got the GData::Client::CaptchaError because I was re-logging in with every request. Reading this post, it recommends not logging in with every request, but caching the authentication token. How do I go about doing that correctly? Google says it expires every 24 hours, and it doesn't seem like I should store it in the session, so what should I do? I'm using Ruby on Rails with all this. Thanks so much

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• "conveyor belt" cache architecture

  - by Andrew Matthews

  I'm producing an application with a few peculiar internal communication characteristics that make the usual suspects for data storage and transport (Qs and RDBMSs) ill-fitted. I'm wondering whether there is a product out there that matches the following characteristics: all data put into it is peristent all reads are delivered out of memory data is universally available data lives where it is most needed data is versioned (nice to have) updates are transactional (I'd like ACID characteristics) data is potentially replicated, but always in sync works on windows is based on or has bindings for .NET is really fast is really robust is redundant is scalable I'm looking at things like Microsoft codename "Velocity", but I am not sure whether it fits all of the above characteristics. Likewise, Memcached is not a perfect fit either. The current version of this app opts for an RDBMS with a signaling system for inter-system sync, but latency is too high and versioning of the DB is a pain. I need all the robustness, but with none of the trade-offs.

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• How to get the SMTP response in CACHE

  - by praveenjayapal

  Hi friends, I want to retrive the SMTP response after sending the mail. I need to fetch the response for the send mail (whether its send properly or not) The response must be like this Return-path: itgigs@4wtech.com Envelope-to: [email protected] Delivery-date: Fri, 12 Dec 2008 23:54:57 -0500 Received: from pool-98-109-89-94.nwrknj.fios.verizon.net ([98.109.89.94] helo=Andy-PC) by server.4wtech.com with esmtp (Exim 4.69) (envelope-from itgigs@4wtech.com) id 1LBMWn-0005BH-7u for [email protected]; Fri, 12 Dec 2008 23:54:57 -0500 Date: Sat, 13 Dec 2008 04:55:09 UT From: [email protected] Subject: Web Deverloper Internship (SoHo) (955259288 ) To: [email protected] MIME-Version: 1.0 Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable How can i retrieve the SMTP response? Please help me

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• Needed help with deleting rails cache

  - by WarDoGG

  I have been given a project of editing a website which is coded in RoR. However, the changes which i make in the view file is not visible immediately after a hard refresh but after 15-20 mins, the changes reflect. I am guessing this has something to do with the RoR caching system. Can someone please help me out ? The changes i made are purely HTML based like changing HTML attributes, filenames etc...

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• Why this cache doesn't work using final as modifier

  - by Pentium10

  I have this code to get the Cursor once for this instance, and the Log shows it is called many times although I marked as final. What I am missing? private Cursor getAllContactsCached() { final Cursor c=this.getList(); return c; } getAllContactsCached method should retrieve list once, and the 2nd time it should reuse the final object for return

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• Who "invented" i,j,k as integer counter variable names? [closed]

  - by mjy

  Possible Duplicate: Why are we using i as a counter in loops I've used these myself for more than 15 years but cannot really remember how/where I picked up that habit. As it is really widespread, I'm curious to know who originally suggested / recommended using these names for integer loop counters (was it the K&R book?).

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• .Net Application Cache in Cloud Environment

  - by Viracocha

  I'm using the Enterprise Application Block and my application is hosted in a Cloud Environment. I was wondering what else I need to do with my implementation to make it as efficient as possible.

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• .Net Appllication Cache in Cloud Environment

  - by Viracocha

  I'm using the Enterprise Application Block and my application is hosted in a Cloud Environment. I was wondering what else I need to do with my implementation to make it as efficient as possible. Thanks!

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