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• Scaling a video processing application on EC2?

  - by Stpn

  I am approaching the need to scale a video-processign application that runs on EC2. So far the setup is one machine: Backbonejs frontend Rails 3.2 Postgresql Resque + S3 for storage The flow of the app is as follows: 1) Request from frontend. Upload a video. 2) Storing video 3) Quering external APIs. 4) Processing / encoding videos. 5) Post to frontend. I can separate the backend and frontend without any problems, but when it comes to distributing the backend between several servers I am a bit puzzled. I can probably come up with a temporary solution (like just duplicating apps making several instances), but since I don't really have expertise in backend system administration, there can be some fundamental mistakes.. Also I would rather have something that is scalable. I wonder if anyone can give some feedback on the following plan: A) Frontend machine. Just frontend, talks to backend via REST Api of sorts. B) Backend server (BS), main database. Gets request from 1), posts to 2) saves uploads to 3) C) S3 storage. D) Server for quering APIs. Basically just a Resque workers, that post info back to 2) E) Server for video encoding. Processes videos uploaded on 3) and uploads them back. So I will have: A)frontend \ \ B)MAIN_APP/DB ----- C)S3 Storage (Files) / \ / / \ / D)ExternalAPI_queries E)Video_Processing (redundant DB) (redundant DB) All this will supposedly talk to each other via HTTP requests. My reason for this is that Video Processing part is really the most resource-intensive and I would just run barebones application that accepts requests and starts processing them. Questions: 1) In this setup I will have the main database at B) and all other servers will communicate with it via HTTP requests (and store duplicates of databases also I guess..for safety reasons). Is it the right approach or should I have 1 database that everyone connects to (how then?) 2) Is it a good idea to separate API queries from Video Processing part? Logically they are very close (processing is determined by the result of API queries), but resource-wise Video Processing is waaay more intensive. 3) what should I use to distribute calls between backend apps based on load?

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• How do I remove a URL from Google without having to have a Google E-mail Account

  - by PP

  Really simple question. I do not want a Google account. I just want Google to stop making requests every 2 minutes for a URL it should never have known about (apparently Google harvests URLs from search requests as well as private e-mails, not just from actual web pages). But when I search Google help for removing URLs it appears I have to use their "webmaster tools" which require logging into a GMail account! How do I tell Google not to index my URL without becoming a customer? Note: I already return 404 for the URLs in question using a rewrite rule - this appears to make zero difference to the crawler which continually attempts to fetch the page every 2 minutes.

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• python: can't terminate a thread hung in socket.recvfrom() call

  - by Dihlofos

  Hello, everyone I cannot get a way to terminate a thread that is hung in a socket.recvfrom() call. For example, ctrl+c that should trigger KeyboardInterrupt exception can't be caught. Here is a script I've used for testing: from socket import * from threading import Thread from sys import exit class TestThread(Thread): def __init__(self,host="localhost",port=9999): self.sock = socket(AF_INET,SOCK_DGRAM) self.sock.bind((host,port)) super(TestThread,self).__init__() def run(self): while True: try: recv_data,addr = self.sock.recvfrom(1024) except (KeyboardInterrupt, SystemExit): sys.exit() if __name__ == "__main__": server_thread = TestThread() server_thread.start() while True: pass The main thread (the one that executes infinite loop) exits. However the thread that I explicitly create, keeps hanging in recvfrom(). Please, help me resolve this.

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• ImportError and Django driving me crazy

  - by John Peebles

  OK, I have the following directory structure (it's a django project): - project -- app and within the app folder, there is a scraper.py file which needs to reference a class defined within models.py I'm trying to do the following: import urllib2 import os import sys import time import datetime import re import BeautifulSoup sys.path.append('/home/userspace/Development/') os.environ['DJANGO_SETTINGS_MODULE'] = 'project.settings' from project.app.models import ClassName and this code just isn't working. I get an error of: Traceback (most recent call last): File "scraper.py", line 14, in from project.app.models import ClassName ImportError: No module named project.app.models This code above used to work, but broke somewhere along the line and I'm extremely confused as to why I'm having problems. On SnowLeopard using python2.5.

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• Is there a more expressive way of executing SQL query using Qt?

  - by ShaChris23

  I currently have this code: // Construct query QString const statement = QString("drop database if exists %1") .arg(databaseName_); QSqlQuery query(db); query.exec(statement); Is there a better way to code than the above? Specifically, I dont like how I use QString for SQL statement. It'd be nice if Qt has some class so that I could do something like: // Construct query QSomeClass statement = "drop database if exists %1"; statement.setArg(1, databaseName_); // Replace all %1 in the original string. QSqlQuery query(db); query.exec(statement);

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• Problems with sp_addlinkedserver in MSSQL 2000

  - by manneorama

  Hi! I'm having a bit of a problem with moving specific data from one server running MSSQL 2000 (A) and another running MSSQL 2008 (B). I'm writing a script according to customer specifications which is to be executed on A, populating tables in B with data. However, I can't seem to get the server link to work. -- Bunch of declarations here EXEC sp_addlinkedserver @server = @ServerName, @srvproduct = @ServerProduct, @provider = @ProviderString, @datasrc = @RemoteHost -- Data migration stuff here EXEC sp_dropserver @ServerName Now if I run the script in its entirety I get an error saying: Msg 7202, Level 11, State 2, Line 55 Could not find server 'remoteServer' in sysservers. Execute sp_addlinkedserver to add the server to sysservers. However, if I higlight only the sp_addlinkedserver-part and execute that, there is no error and I can highlight the rest of the script and run it. What am I missing here? Please help! PS. If backup-restore was an option, I would have done that already.

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• nginx + Jetty - thousands of connections stuck in LAST_ACK

  - by virulence

  I have a FreeBSD machine with jails -- two in particular, one that runs nginx and another that runs a Java program that accepts requests via Jetty (embedded mode) Jetty receives upwards of 500 requests/sec constantly and there has been an issue lately where I will constantly have over 60,000 connections in the LAST_ACK state between nginx and jetty. Distribution of all connections (includes some other services, particularly php-fpm) root@host:/root # netstat -an > conns.txt root@host:/root # cat conns.txt | awk '{print $6}' | sort | uniq -c | sort -n 18 LISTEN 112 CLOSING 485 ESTABLISHED 650 FIN_WAIT_2 1425 FIN_WAIT_1 3301 TIME_WAIT 64215 LAST_ACK Distribution of nginx - jetty connections root@host:/root # cat conns.txt | grep '10.10.1.57' | awk '{print $6}' | sort | uniq -c | sort -n 1 3 CLOSE_WAIT 3 LISTEN 18 FIN_WAIT_2 125 ESTABLISHED 64193 LAST_ACK I'd prefer every request to fully close the connection. Clients requests are about 10 minutes apart from each other so connections must be closed. Some of the connections, tcp4 0 0 10.10.1.50.46809 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46805 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46797 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46794 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46790 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46789 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46771 10.10.1.57.9050 LAST_ACK etc.. On Jetty's end I've set maxIdleTime to 2000 -- before this all connections were in ESTABLISHED but they are now LAST_ACK On Jetty's end I've set Connection: close (i.e response.setHeader(HttpHeaders.CONNECTION, HttpHeaderValues.CLOSE);) Jetty never reports a lot of open connections -- always very few. PF/IPFW is not currently being used nginx - reset_timedout_connection is on I cannot figure out how to get nginx or jetty to forcibly close the connection, is this simply something that needs to be fixed in Jetty so that it fully closes the socket after the request finishes? Thanks a lot in advance EDIT: forgot my nginx config for the proxy setup- proxy_pass http://10.10.1.57:9050; proxy_set_header HTTP_X_GEOIP $http_x_geoip; proxy_set_header GEOIP_COUNTRY_CODE $geoip_country_code; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header Connection ""; proxy_http_version 1.1; EDIT2: Forcing Jetty to close the connection via request.getConnection().getEndPoint().close() does nothing -- it's obvious the connection IS being closed (as it's in LAST_ACK) but why isn't it getting past this? Is Nginx keeping the connection open to the backend for some reason?

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• Blocking IP address with port forwarding

  - by Jeff Storey

  I have a website setup behind a router, so the router has the external facing address and it will forward requests to the webserver inside the network. If there are X number of invalid login attempts, that IP address will be blocked from logging in. The problem is that because the site is being accessed through port forwarding, all requests show up as though they are coming from the router address, and thus the router address becomes the blocked IP. I'm not sure if this is a limitation of the router (linksys wrt160n) or if this a more general issue. Is there a way to handle this?

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• Setting Up nginx Site Down That Responds Differently to Ajax?

  - by dave mankoff

  I am trying to set up an automatic site-down page for nginx. So far I have this: location / { try_files /sitedown.html @myapp; } location @myapp { ... } That works well enough: if sitedown.html is present, it serves that, otherwise it serves the app. What I'd like to do, however, is respond differently to Ajax requests so that they don't error out the javascript. I believe, using the rewrite module, that I can do something like if ($http_x_requested_with = XMLHttpRequest) { but it's unclear to me how to use this in order to do what I want. I'd like requests that come with that header to return a simple JSON response like "sitedown" with the appropriate json encoding header. Barring that, it would be nice to return a 503 response code that the javascript could react to.

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• Passenger, Apache and avoiding page caching

  - by user38382

  I'm hosting a rack application with passenger and apache. The application is setup to cache the content of each request to the public directory after each request. This allows apache to serve the content directly as a static page for future requests. I would like to tell Apache, presumably through some rewrite rules that any requests with query parameters should not be cached, but instead passed down to the rack application. With a mongrel setup I would just redirect it to the balancer if it meets my rewrite conditions. How do you do the same with passenger?

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• Forward Hostname via my router to another PC for debugging

  - by Markive

  Hi, My web service runs on for example: http://mydomain.com/mywebservice.asmx. This works great, but I have a PDA application which I want to debug it synchronising through this web service. Currently the only way I can do this is to debug the webservice running on the actual server which is far from ideal. What I would like to do is for any device connecting on my wireless network, if it requests mywebservice.asmx for this to forward the request to my development PC and for IIS to then handle the request and allow me to debug in Visual Studio. So device on the network that requests the hostname: mywebservice.asmx will his this PC.. I am at a loss to set this up on my router (Zoom ADSL X6), this is massively out of my scope but any help would be much appreciated

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• How to efficiently dump a huge MySQL innodb database?

  - by Jagbir

  I got an Ubuntu 10.04 production MySQL database server where total size of database is 260 GB while size of root partition is itself 300 GB where DB is stored, essentially means around 96% of / is full and there's no space left for storing dump/backup etc. No other disk is attached to server as of now. My task is to migrate this database to other server sitting in different datacenter. Question is how to do that efficiently with minimum downtime? I'm thinking in line of: Request to attach an extra drive to server and take a dump in that drive. Transfer dump to new server, restore it and make new server slave of existing one to keep data in sync When migration is needed, break replication, update slave config to accept read/write requests and make old server read-only so it won't entertain any write requests and tell app developers to update there config with new IP address for db. What's your suggestions to improve this or any alternate better approach for this task?

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• Apache - mod_pagespeed freezes my website

  - by Jonathan Rioux

  I have installed the mod_pagepseed module for Apache. I am using Debian so I downloaded the .deb file, and installed it successfully. I then configured some filters, and it worked like a charm for some minutes. Then after something like 10 minutes, my website no longer responded to the requests. When I was requesting for my website, it said "Waiting for www.blablabla.com" and I never got the page back from the server. I checked the processes running on my Debian box with top -d 0.5, and nothing eats up the CPU. To make my website responding to requests again, I must do a /etc/init.d/apache2 restart. And then it works again with mod_modspeed applying it's filters for a couple of minutes, and no more response again. How can I diagnose this issue? Is there some other configurations in the mod_pagespeed.conf file that I must set?

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• httpd service keep restarting. after 15-20 mins

  - by niraj

  I have recently purchased Dedicated Server which has 16bg ram and 1TB Harddisk. It has Cpanel and for firewall CSF Installd. I am mainly going to install it for File hosting service. Now the day i moved my httpd service keep restarting every 15-20 mins. It becomes unresponsive after that so have to manually restart it. My httpd settings are Start Servers = 5 Minimum Spare Servers = 5 Maximum Spare Servers = 10 Server Limit = 20000 Max Clients = 10000 Max Requests Per Child = 10000 Keep-Alive = On Keep-Alive Timeout = 5 Max Keep-Alive Requests = Unlimited Timeout 300 TOP is top - 14:53:41 up 1 day, 23:39, 2 users, load average: 0.10, 0.14, 0.09 Tasks: 1563 total, 1 running, 1562 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 0.6%sy, 0.0%ni, 98.1%id, 0.2%wa, 0.0%hi, 0.5%si, 0.0%st Mem: 16303780k total, 16142048k used, 161732k free, 135264k buffers Swap: 8224760k total, 868k used, 8223892k free, 14136616k cached Please help me in this its keep happning.

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• How to build an outbound load balancer with linux?

  - by matnagel

  We have a small house in the countryside and there is no fixed broadband, so we had a mobile flatrate first, and for 2 people with 2 computers it was too slow, so now we have 2 flatrates for 2 client machines. So I pay 2 flatrates and have double bandwith theoretically. There is a local network in the house that connects everything. But when I am alone I wonder how I can use both connections at the same time. I want to build a solution where I can browse the web and page requests are spread between the 2 connections. I imagine there are expensive routers who can split the traffic between 2 lines. But is there a good way to do it with linux? The solution I am looking for will split the requests already for one page (multiple images, css files, javascrfipt files) between the two lines.

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• Worker processes not starting in IIS 7.5. What should I check?

  - by locster

  I have a Windows 7 machine (Windows version 6.1.7601 SP1 Build 7601) with IIS installed. At some point the installation appears to have become 'corrupted' in some way, as any requests are now met with the message: Service Unavailable HTTP Error 503. The service is unavailable. In IIS manager IIS is started and the app pool I am using reports itself as 'Started', yet there is no w3wp.exe process listed in the process list in task manager (I am a local admin and have clicked the 'Show processes from all users' button. I have enabled logging for the web site (at default location of %SystemDrive%\inetpub\logs\LogFiles), but this folder is empty. I am assuming that this log output is written by w3wp.exe as it handles requests (no w3wp.exe, no log file?). Presumably there is another layer of request handling that is responsible for starting the worker processes, does thsi layer have log files I can check, and/or can I uninstall/re-install that layer? Thanks.

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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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• Nginx proxy to Apache - resolve HTTP ORIGIN

  - by Fratyr

  I have a server setup with nginx serving static content and proxy all PHP/dynamic requests to apache on 127.0.0.1 I'm building an API for my databases, and I need to allow clients by their origin (domain name), rather than just IP. Based on CORS rules. So when I send an HTTP header header("Access-Control-Allow-Origin: www.client-requesting.myapi.com"); from my API server, I have to tell it which origin I allow, otherwise client side requests won't work to my API due to same-origin policy. The question is how can I know which domain name (if any) called my API? What should be the nginx and apache configuration to pass the origin parameter? I tried to google, and all I found is some possible solution with mod_rpaf, but I wanted to be sure. Thanks!

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• Is there a recommended command for "hg bisect --command"?

  - by blokeley

  I have an emergent bug that I've got to track down tomorrow. I know a previous hg revision which was good so I'm thinking about using hg bisect. However, I'm on Windows and don't want to get into DOS scripting. Ideally, I'd be able to write a Python unit test and have hg bisect use that. This is my first attempt. bisector.py #!/usr/bin/env python import sys import unittest class TestCase(unittest.TestCase): def test(self): #raise Exception('Exception for testing.') #self.fail("Failure for testing.") pass def main(): suite = unittest.defaultTestLoader.loadTestsFromTestCase(TestCase) result = unittest.TestResult() suite.run(result) if result.errors: # Skip the revision return 125 if result.wasSuccessful(): return 0 else: return 1 if '__main__' == __name__: sys.exit(main()) Perhaps I could then run: hg bisect --reset hg bisect --bad hg bisect --good -r 1 hg bisect --command=bisector.py Is there a better way of doing it? Thanks for any advice.

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• Condition Variable in Shared Memory - is this code POSIX-conformant?

  - by GrahamS

  We've been trying to use a mutex and condition variable to synchronise access to named shared memory on a LynuxWorks LynxOS-SE system (POSIX-conformant). One shared memory block is called "/sync" and contains the mutex and condition variable, the other is "/data" and contains the actual data we are syncing access to. We're seeing failures from pthread_cond_signal() if both processes don't perform the mmap() calls in exactly the same order, or if one process mmaps in some other piece of shared memory before it mmaps the sync memory. This example code is about as short as I can make it: #include <sys/types.h> #include <sys/stat.h> #include <sys/mman.h> #include <sys/file.h> #include <stdlib.h> #include <pthread.h> #include <errno.h> #include <iostream> #include <string> using namespace std; static const string shm_name_sync("/sync"); static const string shm_name_data("/data"); struct shared_memory_sync { pthread_mutex_t mutex; pthread_cond_t condition; }; struct shared_memory_data { int a; int b; }; //Create 2 shared memory objects // - sync contains 2 shared synchronisation objects (mutex and condition) // - data not important void create() { // Create and map 'sync' shared memory int fd_sync = shm_open(shm_name_sync.c_str(), O_CREAT|O_RDWR, S_IRUSR|S_IWUSR); ftruncate(fd_sync, sizeof(shared_memory_sync)); void* addr_sync = mmap(0, sizeof(shared_memory_sync), PROT_READ|PROT_WRITE, MAP_SHARED, fd_sync, 0); shared_memory_sync* p_sync = static_cast<shared_memory_sync*> (addr_sync); // init the cond and mutex pthread_condattr_t cond_attr; pthread_condattr_init(&cond_attr); pthread_condattr_setpshared(&cond_attr, PTHREAD_PROCESS_SHARED); pthread_cond_init(&(p_sync->condition), &cond_attr); pthread_condattr_destroy(&cond_attr); pthread_mutexattr_t m_attr; pthread_mutexattr_init(&m_attr); pthread_mutexattr_setpshared(&m_attr, PTHREAD_PROCESS_SHARED); pthread_mutex_init(&(p_sync->mutex), &m_attr); pthread_mutexattr_destroy(&m_attr); // Create the 'data' shared memory int fd_data = shm_open(shm_name_data.c_str(), O_CREAT|O_RDWR, S_IRUSR|S_IWUSR); ftruncate(fd_data, sizeof(shared_memory_data)); void* addr_data = mmap(0, sizeof(shared_memory_data), PROT_READ|PROT_WRITE, MAP_SHARED, fd_data, 0); shared_memory_data* p_data = static_cast<shared_memory_data*> (addr_data); // Run the second process while it sleeps here. sleep(10); int res = pthread_cond_signal(&(p_sync->condition)); assert(res==0); // <--- !!!THIS ASSERT WILL FAIL ON LYNXOS!!! munmap(addr_sync, sizeof(shared_memory_sync)); shm_unlink(shm_name_sync.c_str()); munmap(addr_data, sizeof(shared_memory_data)); shm_unlink(shm_name_data.c_str()); } //Open the same 2 shared memory objects but in reverse order // - data // - sync void open() { sleep(2); int fd_data = shm_open(shm_name_data.c_str(), O_RDWR, S_IRUSR|S_IWUSR); void* addr_data = mmap(0, sizeof(shared_memory_data), PROT_READ|PROT_WRITE, MAP_SHARED, fd_data, 0); shared_memory_data* p_data = static_cast<shared_memory_data*> (addr_data); int fd_sync = shm_open(shm_name_sync.c_str(), O_RDWR, S_IRUSR|S_IWUSR); void* addr_sync = mmap(0, sizeof(shared_memory_sync), PROT_READ|PROT_WRITE, MAP_SHARED, fd_sync, 0); shared_memory_sync* p_sync = static_cast<shared_memory_sync*> (addr_sync); // Wait on the condvar pthread_mutex_lock(&(p_sync->mutex)); pthread_cond_wait(&(p_sync->condition), &(p_sync->mutex)); pthread_mutex_unlock(&(p_sync->mutex)); munmap(addr_sync, sizeof(shared_memory_sync)); munmap(addr_data, sizeof(shared_memory_data)); } int main(int argc, char** argv) { if(argc>1) { open(); } else { create(); } return (0); } Run this program with no args, then another copy with args, and the first one will fail at the assert checking the pthread_cond_signal(). But change the open() function to mmap() the "/sync" memory first and it will all work fine. This seems like a major bug in LynxOS but LynuxWorks claim that using mutex and condition variable in this way is not covered by the POSIX standard, so they are not interested. Can anyone determine if this code does violate POSIX? Or does anyone have any convincing documentation that it is POSIX compliant?

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• Getting "stack level too deep" error when deploying with Capistrano, Rails 3.1 ruby 1.9.2

  - by Victor S

  Here is the log for the cap deploy script output around where the error occurs. Anny suggestions why this might be happening? Thanks! [yup.la] executing command [yup.la] sh -c 'cd /srv/www/portrait/releases/20120406051647 && bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile' ** [out :: yup.la] rake aborted! ** [out :: yup.la] ** [out :: yup.la] stack level too deep ** [out :: yup.la] (in /srv/www/portrait/releases/20120406051647/app/assets/stylesheets/mobile.css.scss) ** [out :: yup.la] ** [out :: yup.la] Tasks: TOP => assets:precompile:primary ** [out :: yup.la] (See full trace by running task with --trace) ** [out :: yup.la] command finished in 30868ms *** [deploy:update_code] rolling back * executing "rm -rf /srv/www/portrait/releases/20120406051647; true" servers: ["yup.la"] [yup.la] executing command [yup.la] sh -c 'rm -rf /srv/www/portrait/releases/20120406051647; true' command finished in 288ms failed: "sh -c 'cd /srv/www/portrait/releases/20120406051647 && bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile'" on yup.la /Users/victorstan/Sites/portrait ?

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• Mysql transactions issue

  - by Stann

  In straight mysql script I'd do transactions like this: START TRANSACTION; SELECT @A:=SUM(salary) FROM table1 WHERE type=1; UPDATE table2 SET summary=@A WHERE type=1; COMMIT; i'm a little confused about how transactions work in PDO. It looks like there are beginTransaction() and commit() methods - so I'm not sure are these just convenience wrappers around staright SQL? or are they doing some more job behind the doors? In other words - are these examples below essentially the same? example 1: $dbh->exec( 'START TRANSACTION' ); //...do some db work here... $dbh->exec( "COMMIT" ); example 2: $dbh->beginTransaction(); //...do some db work here... $dbh->commit();

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• Echo 404 directly from nginx to improve performance

  - by user64204

  I am in charge of production servers serving static content for a website. Those servers are constantly being crawled by bots looking for potential exploits (which isn't that much of a problem security-wise because no application can be reached behind the web server) but generates thousands of 404 per day, sometimes per hour. I am looking into ways of blocking those requests but it's tricky (you want to make sure you don't block legitimate traffic and these bots are becoming more and more clever at looking like they're legit) and is going to take me a while to find an acceptable solution. In the meantime I would like to reduce the performance impact of serving those 404 pages. Indeed we're using nginx which by default is configured to serve it's 404 page from the disk (This can be changed using the error_page directive but in the end the 404 will either have to be served from disk or from another external source (e.g. upstream application which would be worst)) which isn't ideal. I ran a test with ab on my local machine with a basic configuration: in one case I echo a message directly from nginx so the disk isn't touched at all, in the other case I hit a missing page and nginx serves its 404 from disk. server { # [...] the default nginx stuff location / { } location /this_page_exists { echo "this page was found"; } } Here are the test results (my laptop has Intel(R) Core(TM) i7-2670QM + SSD in case you're wondering why they are so high): $ ab -n 500000 -c 1000 http://localhost/this_page_exists Requests per second: 25609.16 [#/sec] (mean) $ ab -n 500000 -c 1000 http://localhost/this_page_doesnt_exists Requests per second: 22905.72 [#/sec] (mean) As you can see, returning a value with echo is 11% ((25609-22905)÷22905×100) faster than serving the 404 page from disk. Accordingly I would like to echo a simple 404 Page not Found string from nginx. I tried many things so far but they all failed, essentially the idea was this: location / { try_files $uri @not_found; } location @not_found { echo "404 - Page not found"; } The problem is that as soon as the echo directive is used, the http response code is set to 200. I tried changing that by doing error_page 200 = 400 but that breaks the configuration. How can I serve a 404 page directly from nginx? (without hacking the source which may be might next step)

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• HTACCESS Rewrite problem

  - by TiuTalk

  I have this folder structure: /var/www/mysite/abc/ /var/www/mysite/def/ /var/www/mysite/fgh/ /var/www/mysite/ijk/ /var/www/mysite/portal/ /var/www/mysite/wyz/ Today's my server is redirecting all requests of www.mydomain.com to www.mydomain.com/portal and that's ok... But I want to modify this behavior and keep www.mydomain.com acessing the /var/www/mysite/portal/ folder on background while www.mydomain.com/abc/ still acessing the /var/www/mysite/abc/ folder as before. That's what i've tried without sucess on my htaccess: IndexIgnore * Options +FollowSymlinks <IfModule mod_rewrite.c> RewriteEngine On #This doesn't work!!! #RewriteCond %{REQUEST_URI} !^abc #Neither this :\ #RewriteCond %{REQUEST_URI} !^/abc RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^$ /portal/index.php [L] RewriteRule . /portal/index.php [L] </IfModule> All requests keep goin to www.mydomain.com/portal/ when I use this .htaccess (with or without the commented lines)

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• How to set which IP to use for a HTTP request?

  - by GetFree

  This is probably a silly question. I'm doing some http requests using wget from the command line, and I want those connections to be made through one specific IP of the 4 IPs my server has. Those http requests go to one specific range of IPs so I only want those to be routed differently. The 4 interfaces in my server are eth0, eth0:0, eth0:1, eth0:2. I tried with the following command: route add -net 192.164.10.0/24 dev eth0:0 But when I see the routing table it says: Destination Gateway Genmask Flags MSS Window irtt Iface 192.164.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 The interface is set to eth0 not eth0:0 as my command says. What am I doing wrong?

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