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• how to pass domain name to backend with pound

  - by FurtiveFelon

  I am using pound as a way to decode SSL for the backend, but the bulk of the work is done on varnish (including virtualhost stuff). As a result, I need pound to just forward all other traffic to varnish verbatim, but it doesn't seem to do that. I am using the default configuration: ListenHTTP Address 1.2.3.4 Port 8080 ## allow PUT and DELETE also (by default only GET, POST and HEAD)?: xHTTP 0 Service BackEnd Address 127.0.0.1 Port 80 End End End So whenever I hit example.com:8080, it will always redirect to the default backend for varnish, which i assume was because the domain (host) header isn't send along. Anyone know what could be wrong? Thanks a lot! Jason

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• Has anyone seen an HTTP 500 error when HTTPS traffic going through Pound Proxy forwards to an HTTP page?

  - by scientastic

  We have Varnish as our load balancer and reverse proxy cache for normal HTTP traffic. For HTTPS traffic, we use Pound proxy to unwrap the SSL and forward to Varnish, which then forwards to the back-end servers. This is used for our "checkout" process to encrypt credit card info in transition. However, on the last stage of checkout, users are always getting an HTTP 500 (Internal Server) error. It doesn't seem to be due to our back-end app server, by all tests I've tried. Does anyone know anything about how that transition works-- the transition back from HTTPS to HTTP and the interaction between Pound and Varnish-- and why it might cause 500 errors?

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• What is the best method for implementing mouse wheel activity in Delphi VCL forms?

  - by Brian Frost

  As a long time user of Delphi 7, I've rolled my own mouse wheel handling in a few controls but lately I've noticed that some recent applications only need the mouse cursor to be placed over a control (e.g a list box or tree view) for the mouse wheel activity to cause that control to scroll. This feels nice (as opposed to having to click focus a control before it responds to the wheel. Now I've moved to Delphi 2010 I'm wondering what is the 'correct' behavior? And what can I use in Delphi that avoids me having to bodge this with my own solutions now? Thanks.

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• How to localize Developer Express VCL components at Design Time in Delphi 2006?

  - by douglaslise

  I can only translate my application to my language using TcxLocalizer at runtime, but I need this working also in design-time. Does anyone has some suggestion? Thanks in advance

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• How localize Developer Express VCL components at Design Time in Delphi 2006?

  - by douglaslise

  I can only translate my application to my language using TcxLocalizer at runtime, but I need this working also in design-time. Does anyone has some suggestion? Thanks in advance

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• What is the best method for implementing mouse wheel activity in Delph1 VCL forms?

  - by Brian Frost

  As a long time user of Delphi 7, I've rolled my own mouse wheel handling in a few controls but lately I've noticed that some recent applications only need the mouse cursor to be placed over a control (e.g a list box or tree view) for the mouse wheel activity to cause that control to scroll. This feels nice (as opposed to having to click focus a control before it responds to the wheel. Now I've moved to Delphi 2010 I'm wondering what is the 'correct' behaviour? And what can I use in Delphi that avoids me having to bodge this with my own solutions now? Thanks.

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• Varnish gets in a restart loop and causes the system to lock up; how can I fix?

  - by chrism2671

  Here is an extract from the syslog. Mar 2 14:01:10 ip-10-226-34-17 varnishd[20204]: Child (20205) not responding to ping, killing it. Mar 2 14:01:16 ip-10-226-34-17 varnishd[20204]: Child (20205) not responding to ping, killing it. Mar 2 14:01:16 ip-10-226-34-17 varnishd[20204]: Child (20205) died signal=3 Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child cleanup complete Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: child (13224) Started Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child (13224) said Closed fds: 4 5 6 10 11 13 14 Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child (13224) said Child starts Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child (13224) said managed to mmap 536870912 bytes of 536870912 Mar 2 14:01:21 ip-10-226-34-17 varnishd[20204]: Child (13224) said Ready Mar 2 14:01:35 ip-10-226-34-17 varnishd[20204]: Child (13224) not responding to ping, killing it. Mar 2 14:02:10 ip-10-226-34-17 last message repeated 7 times Mar 2 14:03:15 ip-10-226-34-17 last message repeated 13 times Mar 2 14:03:20 ip-10-226-34-17 varnishd[20204]: Child (13224) not responding to ping, killing it. Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: Child (13224) not responding to ping, killing it. Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: Child (13224) not responding to ping, killing it. Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: Child (13224) died signal=3 Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: Child cleanup complete Mar 2 14:05:53 ip-10-226-34-17 varnishd[20204]: child (13288) Started I'm not expecting a solution here but any help just to decode what each line is doing would be very instructive. Many thanks!

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• Fail-over caching reverse proxy

  - by sybreon

  Is there a way to configure varnish or any other caching reverse proxy, to serve pages from its cache when the back-end fails? At the moment, if the back-end goes down a 503 Service Unavailable error would be returned to the browser. I would prefer it if visitors got to see a cached version than an error page while the back-end is being fixed. My setup: [varnish (public ip)] <=== [router] <=== [web server (private ip)] PS: I have only one back-end web server.

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• WebDav rename fails on an Apache mod_dav install behind NginX

  - by The Daemons Advocate

  I'm trying to solve a problem with renaming files over WebDav. Our stack consists of a single machine, serving content through Nginx, Varnish and Apache. When you try to rename a file, the operation fails with the stack that we're currently using. To connect to WebDav, a client program must: Connect over https://host:443 to NginX NginX unwraps and forwards the request to a Varnish server on http://localhost:81 Varnish forwards the request to Apache on http://localhost:82, which offers a session via mod_dav Here's an example of a failed rename: $ cadaver https://webdav.domain/ Authentication required for Webdav on server `webdav.domain': Username: user Password: dav:/> cd sandbox dav:/sandbox/> mkdir test Creating `test': succeeded. dav:/sandbox/> ls Listing collection `/sandbox/': succeeded. Coll: test 0 Mar 12 16:00 dav:/sandbox/> move test newtest Moving `/sandbox/test' to `/sandbox/newtest': redirect to http://webdav.domain/sandbox/test/ dav:/sandbox/> ls Listing collection `/sandbox/': succeeded. Coll: test 0 Mar 12 16:00 For more feedback, the WebDrive windows client logged an error 502 (Bad Gateway) and 303 (?) on the rename operation. The extended logs gave this information: Destination URI refers to different scheme or port (https://hostname:443) (want: http://hostname:82). Some other Restrictions: Investigations into NginX's Webdav modules show that it doesn't really fit our needs, and forwarding webdav traffic to Apache isn't an option because we don't want to enable Apache SSL. Are there any ways to trick mod_dav to forward to another host? I'm open to ideas :).

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• centos6.3 varnish3.03 get the wrong backend

  - by Sola.Shawn

  I install varnish3.03 with yum! I got a problem with it my varnish config bellow:** # #backend weibo { .host = "192.168.1.178"; .port = "8080"; .connect_timeout=20s; .first_byte_timeout=20s; .between_bytes_timeout=20s; } #backend smth { .host = "192.168.1.115"; .port = "8080"; .connect_timeout=20s; .first_byte_timeout=20s; .between_bytes_timeout=20s; } #sub vcl_recv { if (req.restarts == 0) { if (req.http.x-forwarded-for) { set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip; } else { set req.http.X-Forwarded-For = client.ip; } } if (req.request != "GET" && req.request != "HEAD" && req.request != "PUT" && req.request != "POST" && req.request != "TRACE" && req.request != "OPTIONS" && req.request != "DELETE") { # /* Non-RFC2616 or CONNECT which is weird. */ return(pipe); } if (req.request != "GET" && req.request != "HEAD") { # /* We only deal with GET and HEAD by default */ return(pass); } if (req.http.Authorization || req.http.Cookie) { /* Not cacheable by default */ return(pass); } if (req.http.host ~ "^(hk.)?weibo.com"){ set req.http.host = "hk.weibo.com"; set req.backend = weibo; } elseif (req.http.host ~ "^(www.)?newsmth.net"){ set req.http.host = "www.newsmth.net"; set req.backend = smth; } else { error 404 "Unknown virtual host"; } return(lookup); } ##sub vcl_pipe { return(pipe); } #sub vcl_pass { return(pass); } #sub vcl_hash { hash_data(req.url); if(req.http.host) { hash_data(req.http.host); } else { hash_data(server.ip); } return(hash); } #sub vcl_hit { if(req.http.Cache-Control~"no-cache"||req.http.Cache-Control~"max-age=0"||req.http.Pragma~"no-cache"){ set obj.ttl=0s; return (restart); } return(deliver); } #sub vcl_miss { return(fetch); } #sub vcl_fetch { if (beresp.ttl <= 120s || beresp.http.Set-Cookie || beresp.http.Vary == "*") { /* * Mark as "Hit-For-Pass" for the next 2 minutes */ set beresp.ttl = 10s; return (hit_for_pass); } return(deliver); } #sub vcl_deliver { return(deliver); } #sub vcl_init { return(ok); } #sub vcl_fini { return(ok); } and my Win7's hosts file add bellow: 192.168.1.178 www.newsmth.net 192.168.1.178 hk.weibo.com start varnish varnishd -f /etc/varnish/dd.vcl -s malloc,100M -a 0.0.0.0:8000 -T 0.0.0.0:3500<br> but when I access the "hk.weibo.com:8000" it fine, and got: Hello,I am hk.weibo.com! but when access http://www.newsmth.net:8000/, got: Hello,I am hk.weibo.com! <br> My question is why it isn't "Hello,I am www.newsmth.net!"? varnish fetched the content from the wrong backend. Does anyone know how to fix this?

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• Caching without file extensions

  - by Sigurs

  I'm trying to use Varnish to show the non-logged in users a cached version of my website. I'm able to perfectly detect if the user is logged in or out, but I can't cache pages without extensions. There is no file extension because nginx is rewriting the URL to a php script(so caching .php does not work). For example I'd like varnish to cache: example.com example.com/forum/ example.com/contact/ I have tried if (req.request == "GET" && req.url ~ "^/") { return(lookup); } if (req.request == "GET" && req.url ~ "") { return(lookup); } if (req.request == "GET" && req.url ~ "/") { return(lookup); } but nothing seems to work... any help?

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• HTTP Caching Server that supports POST

  - by Jeroen

  I am hosting a REST service which is sending appropriate cache-control headers. I use Varnish as a caching server in front of my webserver. However, a limitation of varnish is that it doesn't support caching HTTP POST and HTTP PUT. Is there any alternate caching server that will be able to cache these requests? I understand that caching POST is a bit tricky because you cannot just cache based on the url as a key like for GET; it needs to actually inspect the request body. In case of multipart/form-data requests, there should probably be a limit on the size of the request body for it to be cached (so that big file uploads, etc won't be cached). Nevertheless I really want to be able to cache short HTTP POST, or at least the application/x-www-form-urlencoded ones.

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• Auto restart server if virtual memory is too low

  - by Sukhjinder Singh

  There are quite number of software running on my server: httpd, varnish, mysql, memcache, java.. Each of them is using a part of the virtual memory and varnish was configured to be allocated 3GB of memory to run. Due to high traffic load which is 100K, our server ran out of memory and oom-killer is invoked. We've to reboot the server. We have 8GB of Virtual Memory and due to some reason we cannot extend to larger memory. My question is - Is there any automated script, which will monitor how much virtual memory left and based upon certain criteria, lets say if 500MB left than restart the server automatically? I do know this is not the proper solution but we have to do it, otherwise we don't know when server will get OOM and by the time we know and restart the server, we lost our visiting users.

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• Stop VCL Child Controls from Inheriting Parent Popup Menu

  - by Anagoge

  I have a Delphi 2007 VCL TPanel with a TPopupMenu assigned to it. There are some TEdit controls on the panel. The edits inherit the popup menu of the parent panel. I want to not allow this popup inheriting, so the edits will show the default Windows TEdit popup menu with Copy, Cut, Paste, etc., but have not found a way to do it yet. There doesn't appear to be a "ParentPopupMenu" type property to set which controls inherit it from the parent component.

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• Force request to miss cache but still store the response

  - by Tom Marthenal

  I have a slow web app that I've placed Varnish in front of. All of the pages are static (they don't vary for a different user), but they need to be updated every 5 minutes so they contain recent data. I have a simple script (wget --mirror) that crawls the entire website every 15 minutes. Each crawl takes about 5 minutes. The point of the crawl is to update every page in the Varnish cache so that a user never has to wait for the page to generate (since all pages have been generated recently thanks to the spider). The timeline looks like this: 00:00:00: Cache flushed 00:00:00: Spider starts crawling to update cache with new pages 00:05:00: Spider finishes crawling, all pages are updated until 1:15 A request that comes in between 0:00:00 and 0:05:00 might hit a page that hasn't been updated yet, and will be forced to wait a few seconds for a response. This isn't acceptable. What I'd like to do is, perhaps using some VCL magic, always foward requests from the spider to the backend, but still store the response in the cache. This way, a user will never have to wait for a page to generate since there is no 5-minute window in which parts of the cache are empty (except perhaps at server startup). How can I do this?

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• http benchmarking?

  - by Sam Williams

  im running varnish-nginx(php-fpm) and im using ab but it keeps messing up. [root@localhost src]# ab -k -n 100000 -c 750 http://192.168.135.12/index.php This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0 Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Copyright 2006 The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.135.12 (be patient) apr_socket_recv: Connection reset by peer (104) is there anything else i can use? or am i doing it wrong?

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• Nginx refuses to bind to 8080

  - by Stofke

  I have setup Varnish to run on port 80 which seems to work fine. COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME varnishd 8005 nobody 7u IPv4 14055 0t0 TCP *:http (LISTEN) varnishd 8005 nobody 8u IPv6 14056 0t0 TCP *:http (LISTEN) Under available sites in /etc/nginx I have the file default with: server { listen 8080; .... nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) Why is it still looking for port 80?

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• What does the float number indicate when using varnishtop?

  - by Abs

  I have Varnish running and I wanted to see what http response codes commonly occur. I used: varnishtop -i TxStatus However, I am struggling to work out what the numbers on the right mean? Is it number of requests? list length 7 1322.16 TxStatus 200 60.43 TxStatus 302 8.67 TxStatus 304 3.14 TxStatus 500 2.96 TxStatus 404 0.80 TxStatus 301 0.56 TxStatus 403

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• What kind of scaling method is it, when you add new software to a single server to handle more users? [on hold]

  - by Phil

  I have read about scaling (in terms of terminology and methods). This got me confused about the following: On a single computer, running a web server (say apache), if the system administrator adds a front, caching, reverse-proxy such as Varnish, which in that scenario increase the amount of requests this server is able to handle. My question: Setting up such cache increases the capacity of the server to handle work, hence scales it, but without increasing neither the amount of nodes or the node's capacity. What is the name for this type of scaling?

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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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• faster ( squid + apache httpd + apache tomcat )

  - by letronje

  We have a production setup where we have Squid in the front(caching images, js, css, etc) Apache httpd in the middle(prefork + mod_rewrite + mod_jk/AJP + mod_deflate + mod_php(few php pages)) Apache tomcat 5.5 at the end serving all the dynamic stuff. What would be the best way to reduce the overhead of having 3 servers in the request path ? Wondering if replacing httpd with a faster web server like nginx/lighttpd will help. httpd right now does the job of url rewriting(for clean urls) and talking to tomcat(via mod_jk) and compressing output(mod_deflate) and serving some low traffic php pages. What would be ideal replacement for httpd given that we need these features? Is there a way to replace (squid + apache) with a single entity that does caching well (like squid) for static stuff, rewrites url, compresses response and forwards dynamic stuff directly to tomcat ? heard abt varnish cache, wondering if it can help.

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• First request too slow even if I have a load balancer in the back

  - by adrian7

  I have an Apache 2 on Centos + bind with a wordpress website on it (e.g example.com). I have also set up, on another server in a different contry a load balancer (varnish:80 + nginx 127.0.0.1:8080) for it - which task is to server all static content under /wp-content/. Using Simple DNS editor I added an A entry to cdn.example.com pointing to the server's IP. So no extra work from a 2nd dns server. Then using htaccess I redirect all requests to jpg|gif|css|js files to cdn.example.com. That works and all files are saved on the "cdn" server and served right away. My problem is that for the first time I enter on example.com (e.g after restarting the computer or closing the browser) the load time is 1 up to 3 seconds, while any subsequent page loads take only 300 to 600 miliseconds. I know it might be a DNS issue, but I have done a cache check on several websites and cdn.example.com indicates the right IP. Do you have any ideas where I should dig to solve this first-time slowness?

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• Hardware specs for web cache

  - by Raj

  I am looking for recommendations for hardware specs for a server that needs to be a web cache for a user population of about 2,000 concurrent connections. The clients are viewing segmented HTTP video in bitrates ranging from 150kbps to 2mbps. Most video is "live" meaning segments of 2-10 secs each, of which 100 or so are maintained at a time. There are also some pre-recorded fixed length videos. How would I go about doing the provisioning calculation for such a server: What kind of HDD (SSD?), how many NICs how much RAM etc? I am thinking of using Varnish on Linux, all the RAM I can get my hands on, 2 CPUs with 6-8 cores each.

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• options for physical architecture of rails site regarding caching server or cdn

  - by timpone

  I have a rails app that is set on a single server currently. On production, I force_ssl for everything. I am interested in using a caching server for images (I'm fine with css and js being served from origin for time being). Would nginx or varnish (which I have no experience with) be a better solution (for October 2012)? I'd imagine that it would be easy to switch these around while still on this single server architecture. Or would something like cloudfront (which I also have no experience with) make sense for hosting image files? I know this is a vague question but appreciate any current feedback. thx in advance

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• connections on port 80 suddenly refused / server not responding

  - by user1394013

  my dedicated server stopped responding to requests on port 80 today out of sudden, i havent touched anything in more than a month. its ubuntu 10, varnish + nginx + php-fpm, only 1 website. load is at 0. i messaged my ISP if they changed something but no reply yet. i tried to access the site via http://web-sniffer.net/ and it times out on port 80, but if i connect directly to nginx on port 8080 it loads just fine. for normal users, it doesnt load on neither of these in normal browser. any tips what to check or what could be causing this?

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