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  • Tips for maximizing Nginx requests/sec?

    - by linkedlinked
    I'm building an analytics package, and project requirements state that I need to support 1 billion hits per day. Yep, "billion". In other words, no less than 12,000 hits per second sustained, and preferably some room to burst. I know I'll need multiple servers for this, but I'm trying to get maximum performance out of each node before "throwing more hardware at it". Right now, I have the hits-tracking portion completed, and well optimized. I pretty much just save the requests straight into Redis (for later processing with Hadoop). The application is Python/Django with a gunicorn for the gateway. My 2GB Ubuntu 10.04 Rackspace server (not a production machine) can serve about 1200 static files per second (benchmarked using Apache AB against a single static asset). To compare, if I swap out the static file link with my tracking link, I still get about 600 requests per second -- I think this means my tracker is well optimized, because it's only a factor of 2 slower than serving static assets. However, when I benchmark with millions of hits, I notice a few things -- No disk usage -- this is expected, because I've turned off all Nginx logs, and my custom code doesn't do anything but save the request details into Redis. Non-constant memory usage -- Presumably due to Redis' memory managing, my memory usage will gradually climb up and then drop back down, but it's never once been my bottleneck. System load hovers around 2-4, the system is still responsive during even my heaviest benchmarks, and I can still manually view http://mysite.com/tracking/pixel with little visible delay while my (other) server performs 600 requests per second. If I run a short test, say 50,000 hits (takes about 2m), I get a steady, reliable 600 requests per second. If I run a longer test (tried up to 3.5m so far), my r/s degrades to about 250. My questions -- a. Does it look like I'm maxing out this server yet? Is 1,200/s static files nginx performance comparable to what others have experienced? b. Are there common nginx tunings for such high-volume applications? I have worker threads set to 64, and gunicorn worker threads set to 8, but tweaking these values doesn't seem to help or harm me much. c. Are there any linux-level settings that could be limiting my incoming connections? d. What could cause my performance to degrade to 250r/s on long-running tests? Again, the memory is not maxing out during these tests, and HDD use is nil. Thanks in advance, all :)

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  • Is it possible to add asterisk serveralias to virtualhost without modifying httpd.conf manually?

    - by Favourite Chigozie Onwuemene
    Is it possible to add wildcard serveralias (example: *.somesite.com) in an apache server without modifying httpd.conf manually? I use a DNS different from my hosting server and i have added asterisk A record to my DNS to point all request like (test.somesite.com,test2.somesite.com) to my hosting servers IP, but i don't see anyway of adding asterisk serveraliases to apache httpd.conf file in my cpanel. Pls is there a solution?

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  • How to match against multiple value possiblities in Excel

    - by Henno
    I have list of person names in column A. I want to display "1" in column B for names which end with either "e" or "i" or "n". If there would be only one match to test against, I would write something like: =IF( MID(A1,FIND(" ",B1)-1,1) = "e", "1", "0") In PHP I would solve that like this: echo in_array( $names[$row_number], array('e', 'i', 'n') ) ? '1' : '0'; What formula should I use in column B in Excel?

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  • How to prevent a database from being restored?

    - by André
    Is there a way to prevent a database from being restored with a DDL trigger or something? The background is that I would like to prevent restoring a database on a test server by a colleague. So far I had a look a DDL trigger but didn't find the right event to react on the restore action.

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  • Using proxy server to redirect MySQL traffic to multiple servers using standard port?

    - by FrenchFry
    Is it possible to redirect MySQL (tcp) traffic to multiple servers based on domain name alone? Our DNS is setup to point several sub-domain aliases to one proxy machine. (running haproxy and iptables). We would like to redirect all database traffic through this proxy server and route it to the appropriate db server, WITHOUT deviating from the standard MySQL port. dev.domain1.com:3306 -- dbDevServer.domain1.com:3306 test.domain1.com:3306 -- dbTestServer.domain1.com:3306 prod.domain1.com:3306 -- dbProdServer.domain1.com:3306 Thanks!

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  • How do I override apt-get removing dependent packages?

    - by iainH
    I want to replace postfix with exim4 on my Ubuntu test server to reflect the setup I have on my production server, but apt-get and aptitude (quite understandably) insist on removing several packages that depend upon having a mail stack. However, in this case I am prepared to override apt-get's undoubted good sense as exim should fulfil all the requirements of the dependent packages, providing mail and sendmail functionality for my applications. I don't want to remove the dependent packages as there is months of effort invested and, although backed up, will be a pain to reconstruct properly.

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  • setting up a samba PDC -error with testparm

    - by Rungano
    Hi guys I have installed a samba PDC but when I test the samba configurations file I am getting errors like these, "Invalid combination of parameters for service homes. Map system can only work if create mask includes octal 010 (S_IXGRP)." My Configuration file is as follows [homes] comment = Home Directories path = /home_srv1/%u valid users = %S read only = No create mask = 0660 directory mask = 0770 browseable = No I tried to google but with no luck, Serverfault is always my best hope. Thanks for helping out.

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  • Win7 Modifying incoming HTTP packet from specific url automatically

    - by xeross
    Hey, Is there an application that can listen in on my PCs http traffic (Preferably process specific), and modify packets that were requested from a certain url ? So let's say everytime I request http://example.tld/test.html it would replace any occurence of let's say "i" with "I", it's a simple example but still it's an example Thanks for your time, Xeross

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  • Auto-mounting a windows share on Linux AD login

    - by Jamie
    I've managed to configure my test Ubuntu 10.04 Beta 2 Server VM to accept logins (via ssh) from users who have domain accounts in active directory via Kerberos, nsswitch.conf and PAM configurations. The final thing I'd like to happen is locating their home directory on a Windows server share. Each domain account ($USER) has a windows share ala: \\winsrvr\users\$USER. Can someone push me in the direction I need to go?

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  • 10 Million records = wiped MySQL DB?

    - by Josh K
    So I was trying to load some test data and it appears to have killed my entire database. This is one case where it's great to have backups! They were all plain insert queries, probably about a 900 MB file. What could have gone wrong?

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  • Is it possible to print on a networked Windows Print server from an AIX server, without using remote printer queues?

    - by Stringent Software
    I have an application on an AIX server (v5.3) that needs to print via a Windows Print Server over the LAN. The simplest way to do this is to use SMIT to setup a remote print queue - which I've done on the test environment - but the IT department have refused to set up a remote print queue on the Production server. I don't have root access to the Production server. Is there any other method for connecting the app to the print server that doesn't involve print queues on the AIX box?

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  • Windows 2003 Server, can't connect to an SSL Site from IE.

    - by JL
    I am trying to connect to connect to www.czebox.cz using internet explorer on Windows 2003 server. If you have a server to test from please do, and you'll notice that it does not connect instead returns - Internet Explorer cannot display the webpage. From Firefox it works fine on the server. From Windows 7 it works fine in Internet Explorer. How can I get it to work in Windows 2003 Server using IE?

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  • How do I install Skype on computer so that anyone who logs in does NOT have to go through the initial config?

    - by Matt
    I installed Skype when logged on to the (local) admin account. Now, when I log off that, and log on as myname on the domain, I have to click through the intial setup steps (after you've already run the installer) of Skype. So, I have to click next to get through the mic setup/test, and it asks me if I want to take a pic. How do I get it so that any person who logs in can just open Skype and go straight to the login screen? Windows 7 64 bit, 2008R2

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  • Limiting nproc in an upstart job

    - by Kevin Schmid
    What exactly does the stanza limit nproc 20 20 in an Upstart job do? I've read the documentation here (http://upstart.ubuntu.com/wiki/Stanzas#limit), and it seems like it would limit nproc for any process related to the job. However, I don't see this effect when I've added this to my job's conf file - in this specific case, I've confirmed that my test job's single process was able to fork more than 20 child processes. Any advice? Thanks.

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  • Is it possible to change the Raid5 chunk size of an existing device?

    - by AlexCombas
    I have an existing raid5 device which I created using mdadm on Linux. When I created the device I set the chunk size to 64 but I would like to test the performance of various sizes but I don't want to have to rebuild my entire system to do so. If it is not possible to do it live then is it possible to do this by booting with a rescue disk? Any advice on the steps how to do this, either live or with a rescue disk, will be greatly appreciated.

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  • Is it possible to use Linux as a Fibre Channel Raid Disk Box?

    - by SvenW
    You probably all know the relatively simple RAID boxes exporting a bunch of SATA disks as one big drive via FC, SAS or iSCSI, like the HP StorageWorks MSA2000, Infortrends EonStore series or many different other models from different manufacturers. Is it possible to create such a device with Linux, a few disks and an FC controller, using the controller in the reverse direction than usual? This would come handy to test some ideas and concepts in an emerging SAN environment.

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  • What kind of sorting does the Windows 7 login screen use for usernames?

    - by Paul D. Waite
    I’ve set up ten Windows 7 user accounts, so that I can test different versions of Google Chrome*. I’ve named the accounts “Chrome 01”, “Chrome 02”, and so on. Ideally, I’d like the accounts sorted on the login screen by Chrome version, which is why I added the leading zero to the version number (assuming it was an alphabetic sort). However, when I created the “Chrome 10” account, it ended up sorted between “Chrome 01” and “Chrome 02”. What is going on? *(Chrome installs are user-account-specific)

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  • Zipping only files using powershell

    - by SteB
    I'm trying to zip all the files in a single directory to a different folder as part of a simple backup routine. The code runs ok but doesn't produce a zip file: $srcdir = "H:\Backup" $filename = "test.zip" $destpath = "K:\" $zip_file = (new-object -com shell.application).namespace($destpath + "\"+ $filename) $destination = (new-object -com shell.application).namespace($destpath) $files = Get-ChildItem -Path $srcdir foreach ($file in $files) { $file.FullName; if ($file.Attributes -cne "Directory") { $destination.CopyHere($file, 0x14); } } Any ideas where I'm going wrong?

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  • DNS not being "replicating" everywhere

    - by cromestant
    We have a DNS server, and created a new CNAME: lets say login.server.domain now, if I do NSLOOkup from within our network I get back the config (this is a public address) but if I test from outside I get a not found error.. ** server can't find login.server.domain NXDOMAIN What could be happening? why is this only replicating within our network? FYI config has over 48 hours so not a time issue. thanks in advance

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