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• SQL Server 2008 Web VS SQL Server 2008 Enterprise

  - by Jeremy

  I wrote an application a few months ago, and was hosting it out of our offices on a workstation with an Intel Core 2 Quad Q8200 @ 2.33GHz, 8 GB RAM, Windows Server 2008 Enterprise and SQL Server 2008 Enterprise. Both the webserver and database server were run on the same machine. We had a huge influx in traffic, and moved ClubUptime.com, and got 2 of their top teir windows VMs. The Database server runs Windows 2008 R2 Standard and SQL Server 2008 R2 Web on 8 GB ram and an Intel Xeon e5620 @ 2.40GHz. Ever since switching, the database which used to run at around 400MB in RAM now runs at around 4-7GB, and there haven't been any changes to it (other than a couple columns here and there). Our traffic has quadrupled, and our DB is 6 GB on disk, why would SQL server take up 7 GB if the DB is only 6. And why would it be storing the ENTIRE database in memory? Another thing is why growing 4 times in size did the database's memory footprint grow 12 times? Last question: Why does the CPU peg at 100% now where it didn't before? The design is simple, VERY few joins, NO subqueries. I am just at a loss, unless it is the SQL server edition, or the fact that I moved from real hardware to a VM.

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• Apache web logs "GET http/1.1" 200 error?

  - by songdogtech

  I've got some puzzling (at least to me) errors that show up in my webserver logs. What's puzzling is that they show my error page being referenced, but that error page doesn't show up as being displayed in hits on statcounter.com. Can someone tell me the difference in these two kinds of errors? Or is only one a "real" error? This is in WordPress, and I have my 404.php file in my theme redirecting to a static Wordpress page at mydomain.com/error/ These first two log entries show /error/, but a "hit" on my /error/ page doesn't show in my webstats. The page referenced - /2009/08/delete-preference-files/ - exists, and shows a "hit" at statcounter. 92.17.232.242 - - [13/Mar/2010:01:45:43 -0800] "GET /error/ HTTP/1.1" 200 4012 "http://markratledge.com/2009/08/delete-preference-files/" "Mozilla/5.0 (Windows;U; Windows NT 5.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 (.NET CLR 3.5.30729)" 732 4432 92.17.232.242 - - [13/Mar/2010:01:47:11 -0800] "GET /error/ HTTP/1.1" 200 4012 "http://markratledge.com/wp-content/themes/default/style.css" "Mozilla/5.0(Windows; U; Windows NT 5.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 (.NET CLR 3.5.30729)" 861 4432 These are two error entries that display my /error/ page, because /error/ gets a "hit" in statcounter. The page /cookies/ doesn't exist. 72.174.16.202 - - [13/Mar/2010:10:53:37 -0800] "GET /cookies HTTP/1.1" 302 21 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)" 394 642 72.174.16.202 - - [13/Mar/2010:10:53:38 -0800] "GET /error/ HTTP/1.1" 200 4012 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)" 393 4432

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• How can I set up a local nameserver and modify DNS zones on it?

  - by Joe Hopfgartner

  This is a follow up to this question. I am having an issue with a Router that doesn't support hairpinning properly. See the link above for details. Now I want to set up a local DNS server that Hosts in our LAN can use to resolve public Hostnames (usual webbrowsing... ). Additionally I want to modify certain zones. In our LAN we have some servers serving resources that are not available in our public dns zone. We always have to configure our local LMHost files accordingly. For example we have a staging installation with a new feature running on a local Webserver, and we cannot access it with the IP directly because the website runs in a named virtual host container, we have to configure LMHost file to point some domain to the local IP address. And now we have also the Hair pinning issue. So my question is: What software can I use? Will bind do the job? I just need to insert some A entries into the zone. As easy as possible. We have local Linux/Ubuntu servers.

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• 550 Requested action not taken: mailbox unavailable

  - by Porch

  I setup a small box with Server 2003 64bit to be used as a webserver and email server for a small school. Real simple stuff for a few users. A simple website and a handful of emails. rDNS and spf records setup and pass every test I found including test at dnsstuff.com. Email sending to almost every email address (google, hotmail, aol, whatever) works. However, with one domain, I get an bounce back with the error. 550 Requested action not taken: mailbox unavailable It's another school running Exchange judging from some packet sniffing with WireShark. Every email on this domain I have tried sending to gives this error. The email address is valid as I can send to it from my personal, and gmail account without a problem. Does anyone know of some anti-spam software that gives an 550 error like the above? What else could this be? Thanks for any suggestions. Packet capture of the two servers communicating look like this. 220 <server snip> Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at Sat, 2 Oct 2010 12:48:17 -0700 EHLO <email snip> 250-<server snip> Hello [<ip snip>] 250-TURN 250-SIZE 250-ETRN 250-XXXXXXXXXX 250-DSN 250-ENHANCEDSTATUSCODES 250-8bitmime 250-BINARYMIME 250-XXXXXXXX 250-VRFY 250-X-EXPS GSSAPI NTLM LOGIN 250-X-EXPS=LOGIN 250-AUTH GSSAPI NTLM LOGIN 250-AUTH=LOGIN 250-X-LINK2STATE 250-XXXXXXX 250 OK MAIL FROM: <email snip> 250 2.1.0 <email snip>....Sender OK RCPT TO:<email snip> 250 2.1.5 <email snip> DATA 354 Start mail input; end with <CRLF>.<CRLF> <email body here> . 550 Requested action not taken: mailbox unavailable QUIT 221 Goodbye

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• How can I write automated tests for iptables?

  - by Phil Frost

  I am configuring a Linux router with iptables. I want to write acceptance tests for the configuration that assert things like: traffic from some guy on the internet is not forwarded, and TCP to port 80 on the webserver in the DMZ from hosts on the corporate LAN is forwarded. An ancient FAQ alludes to a iptables -C option which allows one to ask something like, "given a packet from X, to Y, on port Z, would it be accepted or dropped?" Although the FAQ suggests it works like this, for iptables (but maybe not ipchains as it uses in the examples) the -C option seems to not simulate a test packet running through all the rules, but rather checks for the existence for an exactly matching rule. This has little value as a test. I want to assert that the rules have the desired effect, not just that they exist. I've considered creating yet more test VMs and a virtual network, then probing with tools like nmap for effects. However, I'm avoiding this solution due to the complexity of creating all those additional virtual machines, which is really quite a heavy way to generate some test traffic. It would also be nice to have an automated testing methodology which can also work on a real server in production. How else might I solve this problem? Is there some mechanism I might use to generate or simulate arbitrary traffic, then know if it was (or would be) dropped or accepted by iptables?

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• How to route public static IP to a virtual machine on a vmware ESXi host?

  - by Kevin Southworth

  I have 5 static IPs from my ISP (Comcast) and I have a physical machine with VMware ESXi 4.0 on it that is hosting multiple virtual machines. Right now I am just using the default vmware virtual network (vswitch0) with DHCP from the Comcast IP Gateway Router and everything is working fine. Each virtual machine can access the internet, etc. One of my virtual machines is a webserver (Windows Server 2008) and I want to assign it to 1 of my 5 static IPs so it's accessible from the public internet, while leaving the other VMs on the internal LAN still using DHCP. If I just plug my laptop directly into the Comcast IP Gateway (it has 4 ports on the back) and assign my laptop a Static IP using the windows networking dialogs, then I can hit my laptop from the public internet and it works great. However, if I try to do the same steps to set a static IP config on my Windows Server 2008 VM, it does not work. The VM cannot access the internet (open Firefox and try to visit google.com), and I cannnot see the VM from the public internet either. I'm assuming I'm missing something in the ESXi config somewhere, but I'm pretty new to ESXi and I'm not sure how to configure it to work this way.

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• Create a mailbox in qmail, then forward all incoming message to Gmail

  - by lorenzo-s

  I needed to let PHP send mails from my webserver to my web app users. So I installed qmail on my Debian server: sudo apt-get install qmail I also updated files in /etc/qmail specifing my domain name, and then I run sudo qmailctl reload and sudo qmailctl restart: /etc/qmail/defaultdomain # Contains 'mydomain.com' /etc/qmail/defaulthost # Contains 'mydomain.com' /etc/qmail/me # Contains 'mail.mydomain.com' /etc/qmail/rcpthosts # Contains 'mydomain.com' /etc/qmail/locals # Contains 'mydomain.com' Emails are sent without any problem from my PHP script to any email address, using the standard mail PHP library. Now the problem is that if I send mail from my PHP using [email protected] as sender address, I want that customer can reply to that address! And possibly, I want all mails sent to this address should be forwarded to my personal Gmail address. At the moment qmail seems to not accept any incoming mail because of "invalid mailbox name". Here is a complete SMTP session I established with my server: me@MYPC:~$ nc mydomain.com 25 220 ip-XX-XX-XXX-XXX.xxx.xxx.xxx ESMTP HELO [email protected] 250 ip-XX-XX-XXX-XXX.xxx.xxx.xxx MAIL FROM:<[email protected]> 250 ok RCPT TO:<[email protected]> 250 ok DATA 554 sorry, invalid mailbox name(s). (#5.1.1) QUIT I'm sure I missing something related to mailbox or alias creation, in fact I did nothing to define mailbox [email protected] anywhere. But I tried to search something on the net and on the numerous qmail man pages, bot I found nothing.

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• How to change libcurl SSL backend from gnutls to openssl on Ubuntu server

  - by Jayesh

  I am getting gnutls specific errors in my Tornado webserver while processing Google OpenID SSL responses. One of the suggestions I got from Tornado mailing list is to try OpenSSL backend instead of gnutls. But it doesn't seem to be straightforward on Ubuntu server (11.10). On Ubuntu server, gnutls is provided by libcurl3-gnutls package and openssl curl support is provided by libcurl4-openssl-dev package. (I don't know why the later is named 4 and dev, but I couldn't find any other openssl+curl package in apt-cache search). I had libcurl3-gnutls installed by default, but not libcurl4-openssl-dev. So I installed the later and restarted Torando instances. But that didn't seem to work. I still got same gnutls errors. I found old discussions on curl mailing lists regarding the problems of supporting different SSL backends to libcurl, but didn't find exactly how is it done today. So far my guess is openssl is built into libcurl and gnutls is provided through separate package (that will explain why there is no libcurl3-openssl). But how do I make libcurl to pick up openssl backend and not gnutls? Is there some option in libcurl/pycurl API to do this? I tried uninstalling libcurl3-gnutls, but apt-get prompted that it will also remove python-pycurl along with it. So that won't do.

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• Thin server : `start_tcp_server': no acceptor (port is in use or requires root privileges) (RuntimeError)

  - by Rubytastic

  My thin webserver fails to start with an error message. I can hardly find any information or leads on how to fix this, anyone an idea? thx Thin web server (v1.5.0 codename Knife) Maximum connections set to 1024 Listening on 0.0.0.0:9292, CTRL+C to stop /srv/gamers/shared/bundle/ruby/1.9.1/gems/eventmachine-1.0.0/lib/eventmachine.rb:526:in start_tcp_server': no acceptor (port is in use or requires root privileges) (RuntimeError) from /srv/gamers/shared/bundle/ruby/1.9.1/gems/eventmachine-1.0.0/lib/eventmachine.rb:526:instart_server' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/backends/tcp_server.rb:16:in connect' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/backends/base.rb:55:inblock in start' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/eventmachine-1.0.0/lib/eventmachine.rb:187:in call' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/eventmachine-1.0.0/lib/eventmachine.rb:187:inrun_machine' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/eventmachine-1.0.0/lib/eventmachine.rb:187:in run' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/backends/base.rb:63:instart' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/server.rb:159:in start' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/handler/thin.rb:13:inrun' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:265:in start' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:137:instart' from /srv/gamers/shared/bundle/ruby/1.9.1/gems/rack-1.4.1/bin/rackup:4:in <top (required)>' from /srv/gamers/shared/bundle/ruby/1.9.1/bin/rackup:19:inload' from /srv/gamers/shared/bundle/ruby/1.9.1/bin/rackup:19:in `'

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• Using Varnish (only) for DDoS mitigation

  - by Martin Kanters

  My VPS is suffering from a (D)DoS doing a SYN flood with spoofed IPs. I'm right now searching from ways how to be able to defend (at least a bit) against it. It's running a DirectAdmin apache2 webserver. Mainly used for serving PHP and MySQL. We are using CloudFlare, which are saying that they are able to mitigate (D)DoS at some level, now the attacker knows our real IP address, so CloudFlare isn't helping a bit. I've done some searching on the net and found out about enabling SYN cookies, to defend against it. I've checked my settings and it seems it was enabled all along. I've also read about that Varnish is able to defend against SYN flooding and Slowloris attacks, now I'm pretty interested in using that. The thing is that CloudFlare is already caching a lot from us, and I don't wish to spend too much resources on Varnish. Is it possible and smart to set up Varnish only for the better handling of requests? Are there perhaps better ways which I've missed? Thanks in advance, Martin

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• How to fake ip at localhost without LoopBack.

  - by sexer

  How can i fake an ip on my own PC? for example if there were an ip address lets say 201.91.81.71, that Host is somewhere outside of my red and is hosting a webserver. How can set a website on my own PC, and when i go to browser and try to explore 201.91.81.71 it actually explore the website at my own PC? pd: I need it with IP addresses not domain names, since I need to implement it on a non-web service. First guess was installing a LoopBack with 201.191.81.71 as ip, but since some times the subnet works and some other it doesn't isn't a stable solution. Second guess was adding a route to route table : route add 201.91.81.71 mask 255.255.255.255 192.168.1.2 192.168.1.2 is the ip address of my NIC. If i could add this route it would work but windows doesn't let me do so. route add 201.91.81.71 mask 255.255.255.255 127.0.0.1 it doesn't let me set as gateway 127.0.0.1 if 201.91.81.71 isn't set in a NIC, so thats why i set sometimes loopback and this route add is auto, but it needs a subnet mask which doesn't match the ip and cannot set 255.255.255.255, im in real throubles here. can i get some help? thx.

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• apache performance timing out

  - by Mike

  Im running a webserver where I'm hosting about 6-7 websites. Most of these websites get their content from MySQL which is hosted on the same server. Traffic average per day is about 500-600 unique visitors, about 150K hits per week. But for some reason sometimes websites send a timeout, OR sometimes websites dont load all images. I know that I should perhaps separate static content from dynamic content, but for now I think that's not a possibility. I would appreciate any suggestions on how could I improve the performance of apache, so it doesn't keep timing out. Server is running on Sempron LE 1300; 2.3GHz,512K Cache 2GB RAM 10Mbps/1Mbps Services: MySQL, ProFTPD, Apache. Private + Shared = RAM used Program ---------------------------------------------------- 1.2 MiB + 54.0 KiB = 1.2 MiB proftpd 4.1 MiB + 23.0 KiB = 4.1 MiB munin-node 20.8 MiB + 120.5 KiB = 20.9 MiB mysqld 47.3 MiB + 9.9 MiB = 57.3 MiB apache2 (22) top: Mem: 2075356k total, 1826196k used, 249160k free, Timeout 35 KeepAlive On MaxKeepAliveRequests 300 KeepAliveTimeout 5 <IfModule mpm_prefork_module> StartServers 10 MinSpareServers 20 MaxSpareServers 20 MaxClients 60 MaxRequestsPerChild 1000 </IfModule> <IfModule mpm_worker_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule>

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• APC uptime 0 because of Fast

  - by demlasjr

  I have a VPS using Parallels/Plesk (11.0.9 Update #22, last updated at Oct 31, 2012 03:33 AM CentOS 6.3 (Final) x86_64) I have apache (CGI/FastCGI) installed and nginx as reverse proxy. Everything is working just fine. I installed APC for caching, but the issue is that the uptime is 0 always. It's restarting each 15 seconds or so. I checked everywhere and can't find a solution to fix it. The server have the grace restart enabled, but every 6 hours, which shouldn't influence the APC uptime. Searching in Google I found that this could be related to Apache, running with FCGId instead of FastCGI. Plesk/Apache is using this config file: usr/local/psa/admin/conf/templates/default/service/php_over_fastcgi.php which content is: <IfModule mod_fcgid.c> <Files ~ (\.php)> SetHandler fcgid-script FCGIWrapper <?php echo $VAR->server->webserver->apache->phpCgiBin ?> .p$ Options +ExecCGI allow from all </Files> Is here the issue or elsewhere ? How can I fix this to work with FastCGI and make APC working properly. I forgot to specify that even if the uptime is below one minute, APC is doing pretty good job caching (92% are hits).

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• Postfix mail forwarder

  - by Andrew

  Hello, I just bought a dedicated server and I'm trying to install a webserver on it. The server is Ubuntu 10.04. I installed ftp, nginx, php, mysql, bind and now I have to install mail server. For the mail server I'm using Postfix, because it's recomended on ubuntu. I installed Postfix with apt-get install postfix but mail() function from php wasn't working. After a little debug I found the way to solve this : I created an empty file /etc/postfix/main.cf and it worked good. I do have a mx record like this mail 5M IN A xxx.xxx.xxx.xxx example.com. 5M IN MX 1 mail.example.com. After that I wanted to forward all e-mails to my GMail address. So I googled for it and I found in the official docs Virtual Domain Host Forwarding I added these lines in main.cf virtual_alias_domains = example.com virtual_alias_maps = hash:/etc/postfix/virtual I created map file and I placed this line in it @example.com [email protected] I run in terminal postmap /etc/postfix/virtual postfix reload The result: I can send e-mail from php with mail() function, but when I send an email to [email protected] that e-mail isn't forwarded to my Gmail. How to solve this? -Andrew I also tried this but not working http://rackerhacker.com/2006/12/26/postfix-virtual-mailboxes-forwarding-externally/ It works now! But I don't know what the problem was. I just installed "Mail Server" from Tasksel and after that it worked fine. Can anyone tell me what Tasksel installed or that it changed ?

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• filter / directing URLs coming onto a network

  - by Jon

  Hi all, I an not sure if this is possible or not but what i would like to do is as follows: I have one IP address (dynamic using zoneedit.com to keep it upto date). I have one webserver running my main site which is an Ubuntu machine running Apache. I also have a windows 2008 server running another site. Just to confuse things I also run part of my Apache site on the windows server, currently using proxypassreverse to get the information from it. So it looks something like this: IP 1.2.3.4 maps to mydomain.com as well as myotherdomain.com All requests that come into port 80 are forwarded to the Apache box and I use Virtualhost settings to proxy the windows sites where needed. so mydomain.com is an Apache site mydomain.com/mywindowssection is the Apache server using proxypassreverse to get part of the site from the Windows server myotherdomain.com uses Apache and proxypassreverse to get the whole site. What I would like to be able to do is forward all http requests that come into my network to one machine that figures out who should be serving that content. so: mydomain.com would go to the Apache machine myotherdomain.com would go the windows machine. I am just in the process of setting up an Astaro gateway (never done this before so taking a while to configure) as my firewall, dns, dhcp etc, don't know if this can handle it. I have the capacity to run a VM on the network if a seperate box would be needed for this process as well. Thanks for any and all feedback. Jon

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• Why is my connection slow?

  - by Jay R.

  I have a Dell Precision T5400 with a Broadcom 1Gb onboard NIC. For some strange reason, when I access machines on our local network, the best I can get is around 125KB/s download speed. My laptop that has a 10/100Mb NIC onboard usually gets around 300KB/s or better from the same network resource. Both machines are plugged into the same 1Gb switch which connects to our local network wall jack at 100Mb half duplex. There is also a printer plugged into the same switch at 100Mb full. The resource I'm using for the test is a 30MB zip file copied from a jetty webserver that is running as part of a cruisecontrol installation. The cruisecontrol installation is running WindowsXP with full real-time antivirus and Altiris patch management and inventory running. That stuff on its own is eating some of the download speed. I've seen the laptop reach into the multiple MB/s download speed before, but the desktop never seems to get past 125KB/s to 130KB/s. In WindowsXP, before I upgraded the driver in the desktop, it was that slow. In Fedora, it is still slow even though it appears to be using the same driver version as the upgraded Windows driver. The upgraded Windows driver is faster, but still not nearly as fast as the laptop. What gives? Any insight to improve the situation would be appreciated. Could it be that the BroadCom board just isn't that good, or the driver in linux is just not as good as the Windows one?

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• How make rewrite rules relative to .htaccess file.

  - by Kendall Hopkins

  Current I have an .htaccess file like this. RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f [OR] RewriteCond %{REQUEST_URI} ^/(always|rewrite|these|dirs)/ [NC] RewriteRule ^(.*)$ router.php [L,QSA] It works create when the site files are in the document_root of the webserver (ie. domain.com/abc.php - /abc.php). But in our current setup (which isn't changeable), this isn't ensured. We can sometimes have arbitrary folder in between the document root and folder of the .htaccess file (ie. domain.com/something/abc.php - /something/abc.php). The only problem with is that is the second RewriteCond no longer works. Is there anyway to dynamically check if the accessed path by a path relative to .htaccess file. For Example: If I have a site where domain.com/rewrite/ is the directory of the .htaccess file. NOT FORCED TO REWRITE -> domain.com/rewrite/index.php FORCED TO REWRITE -> domain.com/rewrite/rewrite/index.php If I have a site where domain.com/ is the directory of the .htaccess file. NOT FORCED TO REWRITE -> domain.com/index.php FORCED TO REWRITE -> domain.com/rewrite/index.php

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• Remote Socket Read In Multi-Threaded Application Returns Zero Bytes or EINTR (104)

  - by user39891

  Hi. Am a c-coder for a while now - neither a newbie nor an expert. Now, I have a certain daemoned application in C on a PPC Linux. I use PHP's socket_connect as a client to connect to this service locally. The server uses epoll for multiplexing connections via a Unix socket. A user submitted string is parsed for certain characters/words using strstr() and if found, spawns 4 joinable threads to different websites simultaneously. I use socket, connect, write and read, to interact with the said webservers via TCP on their port 80 in each thread. All connections and writes seems successful. Reads to the webserver sockets fail however, with either (A) all 3 threads seem to hang, and only one thread returns -1 and errno is set to 104. The responding thread takes like 10 minutes - an eternity long:-(. *I read somewhere that the 104 (is EINTR?), which in the network context suggests that ...'the connection was reset by peer'; or (B) 0 bytes from 3 threads, and only 1 of the 4 threads actually returns some data. Isn't the socket read/write thread-safe? I use thread-safe (and reentrant) libc functions such as strtok_r, gethostbyname_r, etc. *I doubt that the said webhosts are actually resetting the connection, because when I run a single-threaded standalone (everything else equal) all things works perfectly right, but of course in series not parallel. There's a second problem too (oops), I can't write back to the client who connect to my epoll-ed Unix socket. My daemon application will hang and hog CPU 100% for ever. Yet nothing is written to the clients end. Am sure the client (a very typical PHP socket application) hasn't closed the connection whenever this is happening - no error(s) detected either. Any ideas? I cannot figure-out whatever is wrong even with Valgrind, GDB or much logging. Kindly help where you can.

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• Simulating audio playback on headless linux server

  - by afro

  Hi people, We have a headless linux server (Debian 5) we use for runnin integration tests of our web-page code. Among these tests are ones implemented using Selenium, which practically simulates a user browsing our pages and clicking on things. One of these tests is failing now, because it involves starting a flash-based audio player and checking to see whether the progress bar gets displayed properly. The reason this test fails is that there is no way to play the audio, and no sound card on the machine, which has simple webserver hardware. So, my question would be: Is there a simple way of giving a program the impression that its audio output is being processed, and playback is taking place? I don't have to record the playback, or redirect it or anything like that, just a dummy soundcard, like the dummy X-server we aer using, which actually does not need to display stuff. I have tried using JACK, but it's too complicated, and the documentation does not even answer this very simple question. I also installed alsa on the server; it 'pretends' to run, but when a program tries to play audio, just spews error and debug information having to do with the non-existence of a soundcard. It would be really awesome if one of you has a simple answer to this question. Cheers, Ulas

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• both ssl and non-ssl on single port

  - by Zulakis

  I would like to make my apache2 webserver serve both http and https on the same port. With the different method i tried it was either not working on http or on https.. How can I do this? Update: If I enable SSL and then visit the with http I get page like this: <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>400 Bad Request</title> </head><body> <h1>Bad Request</h1> <p>Your browser sent a request that this server could not understand.<br /> Reason: You're speaking plain HTTP to an SSL-enabled server port.<br /> Instead use the HTTPS scheme to access this URL, please.<br /> <blockquote>Hint: <a href="https://server/"><b>https://server/</b></a></blockquote></p> <hr> <address>Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny16 with Suhosin-Patch mod_ssl/2.2.9 OpenSSL/0.9.8g Server at server Port 443</address> </body></html> Because of this, it seems very much possible to have both http and https on the same port. A first step would be to change this default-page so it would present a 301-Moved header. Update2: According to this, it is possible. Now, the question is just how to configure apache to do it.

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• Walkthrough/guide building aplication server for multi tenant web app [on hold]

  - by Khalid Adisendjaja

  The web app will detect a subdomain such as tenant1.app.com, tenant2.app.com, etc to identify tenant environment, each tenant environment will have a different database credential (port,db name,etc) but still connecting to the same database server. Each tenant should use app.com for their main domain, using their own domain is prohibitted. Each tenant will have their own rest api endpoint such as tenant1.app.com/api/v1/xxxx, tenant2.app.com/api/v1/xxxx, tenant3.app.com/api/v1/xxxx I've come to a simple solution by setting a wildcard subdomain (*.app.com) on webserver Apache/Nginx vhost configuration file. I have googled so many concept for building a multi-tenant app server but still don't understand how to really done it, what is the right way to do it and what is actually required to do this task. So I've come to this questions, Do I need a proxy server, dns masking, etc.. How to monitor each tenants activity What about server performance, load balancing, and scalability How to setup ssl certificate for each tenant what about application cache for each tenant Is it reliable to use the setup for production etc ... I have a very litte experience on server infrastructure, so I'm looking for a DIY walkthrough, step by step guide, or sophisticate solution ready to implemented for production

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• Display maintenance site to requesters based on their IP address

  - by user64294

  Hi all. I would like to set a special configuration in our apache web server. I would like to display sites to the users according to their IP addresses. We plan to upgrade our web sites. During the upgrade we'll put a maintenance site: so all the users which will connect to our web sites will get this site. There are 200 websites affected by the upgrade, so I don't want to change apache settings for each one. In order to test the upgrade i need to set apache to let only my IP address to access to asked site. If my IP address is a.b.c.d and if i ask for test.com i want to see it. but all other users, having a different IP address, should get the maintenane site even if they look for test.com. Our webserver is hosted out of the office (ovh.com france). The testers are the developers at our office and me. We can take some sites and enable them for test in which we implement IP restrictions in each website: the idea is on these websites, if the visitor's IP address is different from our office IP address we redirect this visitor to our maintenance website else we display the website. Is there a way to do this? Thank you.

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• IPtables: DNAT not working

  - by GetFree

  In a CentOS server I have, I want to forward port 8080 to a third-party webserver. So I added this rule: iptables -t nat -A PREROUTING -p tcp --dport 8080 -j DNAT --to-destination thirdparty_server_ip:80 But it doesn't seem to work. In an effort to debug the process, I added these two LOG rules: iptables -t mangle -A PREROUTING -p tcp --src my_laptop_ip --dport ! 22 -j LOG --log-level warning --log-prefix "[_REQUEST_COMING_FROM_CLIENT_] " iptables -t nat -A POSTROUTING -p tcp --dst thirdparty_server_ip -j LOG --log-level warning --log-prefix "[_REQUEST_BEING_FORWARDED_] " (the --dport ! 22 part is there just to filter out the SSH traffic so that my log file doesn't get flooded) According to this page the mangle/PREROUTING chain is the first one to process incomming packets and the nat/POSTROUTING chain is the last one to process outgoing packets. And since the nat/PREROUTING chain comes in the middle of the other two, the three rules should do this: the rule in mangle/PREROUTING logs the incomming packets the rule in nat/PREROUTING modifies the packets (it changes the dest IP and port) the rule in nat/POSTROUTING logs the modified packets about to be forwarded Although the first rule does log incomming packets comming from my laptop, the third rule doesn't log the packets which are supposed to be modified by the second rule. It does log, however, packets that are produced in the server, hence I know the two LOG rules are working properly. Why are the packets not being forwarded, or at least why are they not being logged by the third rule? PS: there are no more rules than those three. All other chains in all tables are empty and with policy ACCEPT.

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• Use of backreferences in fail2ban filters possible?

  - by Izzy

  From time to time, I see collections of suspect "File not found" errors in my Apache logs, basically using the pattern File does not exist: /var/www/file, referer: http://my.server.com/file In human terms: The file was not found, though it referenced here itself. A clear hacking attempt, as that's hardly possible (and the REQUEST_URIs often enough suggest the same). In my eyes a clear case for fail2ban – if I could get backreferences to work here: failregex = ^%(_apache_error_client)s File does not exist: /var/www(.+), referer: http://.+\1$ (Justin Case: above examples assume the DIRECTORY_ROOT of that webserver being /var/www) I googled for hours, searched the fail2ban wiki up and down – but nowhere I could find a statement concerning backreferences in its filters. Are they not supported, or did I do it the wrong way? Any hints how to make it work (except from "dirty hacks" like first sending the request to another fake url using mod-rewrite, and then catching on that (if anyone is interested, I can elaborate on that approach in an answer), or doing something similar using mod-security)? as an entire log line was requested: [Fri Nov 08 14:57:28 2013] [error] [client 50.67.234.213] File does not exist: /var/www/text/files.htm++++++++++++++++++++++++++Result:+using+proxy+27.34.142.47:9090;+no+post+sending+forms+are+found;, referer: http://www.myserver.com/text/files.htm++++++++++++++++++++++++++Result:+using+proxy+27.34.142.47:9090;+no+post+sending+forms+are+found; (sorry, logs were just switched, so this long candidate was the only one left currently; minor adjustments were made for privacy reasons)

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• IPv6 working fine, IPv4 throws OpenSSL error

  - by jippie

  I am building a webserver ( http://blog.linformatronics.nl/ ), which functions just fine on both IPv4 and IPv6 and when using a non-SSL connection. However when I connect to it through https, IPv6 works as expected, but an IPv4 connection throws a client side error. Server side logs are empty for the IPv4/https connection. Summarized in a table: | http | https -----+-------+------------------------------------------------------- IPv4 | works | OpenSSL error, failed. No server side logging. -----+-------+------------------------------------------------------- IPv6 | works | self signed certificate warning, but works as expected Apparently the SSL tunnel isn't even set up, which accounts for the Apache logs being empty. But why does it work fine for IPv6 and fail for IPv4? My question is why is this OpenSSL error being thrown and how can I solve it? Below is some extra information about the setup. IPv6 https Command used to reproduce IPv6/https behaviour: $ wget --no-check-certificate -O /dev/null -6 https://blog.linformatronics.nl --2012-11-03 15:46:48-- https://blog.linformatronics.nl/ Resolving blog.linformatronics.nl (blog.linformatronics.nl)... 2001:980:1b7f:1:a00:27ff:fea6:a2e7 Connecting to blog.linformatronics.nl (blog.linformatronics.nl)|2001:980:1b7f:1:a00:27ff:fea6:a2e7|:443... connected. WARNING: cannot verify blog.linformatronics.nl's certificate, issued by `/CN=localhost': Self-signed certificate encountered. WARNING: certificate common name `localhost' doesn't match requested host name `blog.linformatronics.nl'. HTTP request sent, awaiting response... 200 OK Length: 4556 (4.4K) [text/html] Saving to: `/dev/null' 100%[=======================================================================>] 4,556 --.-K/s in 0s 2012-11-03 15:46:49 (62.5 MB/s) - `/dev/null' saved [4556/4556] IPv4 https Command used to reproduce IPv6/https behaviour: $ wget --no-check-certificate -O /dev/null -4 https://blog.linformatronics.nl --2012-11-03 15:47:28-- https://blog.linformatronics.nl/ Resolving blog.linformatronics.nl (blog.linformatronics.nl)... 82.95.251.247 Connecting to blog.linformatronics.nl (blog.linformatronics.nl)|82.95.251.247|:443... connected. OpenSSL: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol Unable to establish SSL connection. Notes I am on Ubuntu Server 12.04.1 LTS

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