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• Configure IIS site to work with host header & hosts file entry

  - by HarveySaayman

  I'm I bit of an IIS / Web noob (I'm a C# backend service / winforms dev) so please bare with me :-) I've set up a site in IIS on my local dev machine. In the bindings section of the site ive added 4 bindings, all 4 for http: Host Name Port IP Address blog.sourcecube.co.za 26581 * www.blog.sourcecube.co.za 26581 * blog.sourcecube.co.za 26581 127.0.0.1 www.blog.sourcecube.co.za 26581 127.0.0.1 in my hosts file (drivers\etc\hosts), i've added the folling entries: 127.0.0.1 blog.sourcecube.co.za 127.0.0.1 www.blog.sourcecube.co.za when i ping my domain name from the command line it does in fact resolve to the loopback address, 127.0.0.1. So what I'm expecting to happen when i navigate to blog.sourcecube.co.za in my browser is for it to resolve to 127.0.0.1, and when the request hits IIS, it should know which site to serve because of the host header? But when i navigate to blog.sourcecube.co.za, i get an "Unable to connect, Firefox can't establish a connection to the server at blog.sourcecube.co.za" error. What am I doing wrong? --- UPDATE --- Navigating to blog.sourcecube.co.za:26581 from my browser works... I'd like get it working without specifying the port number though.

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• What are the requirements for Windows Remote Assistance over Teredo?

  - by Jens

  I try to get the Windows 7 (or Vista) remote assistance feature to work, without using UPnP on the novices computer. After enabling Teredo on the expert's computer (that is in a corporate network, and therefore has teredo disabled by default), I tried to connect to the novice both using Easy Connect and the invitation file with no success. My triubleshooting included the following (so far). A connection to the novice from my home pc was successful, hinting at a misconfiguration on the experts side. Both computers have a "qualified" connection to the Teredo Server. Both computers have a valid Teredo IP, access to the Global_ PNRP cloud and can resolve names registered with PNRP on the other computer. The expert can resolve the PNRP Id automatically generated with an Easy Connect help request Both computers can ping the other's PNRP name. Both computers can ping the other's Teredo IP Address using ping -6 Now, I am a little stumped. I expected Remote Assistance to work at this point, since my corporate firewall has no Teredo filtering. What could RA cause not to work in this setting? Thanks in advance!

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• Migrating to Windows Server 2008 R2 Domain Controllers - a few Questions/Issues

  - by Chris

  Ok so here's our setup: We have 2 Windows 2003 Domain Controllers. I am trying to replace them with Windows 2008 R2. The 2003 servers are named DC01 and DC02. The 2008 R2 servers are DC1 and DC2. I prepared the Windows Server 2003 Forest Schema for a Domain Controller that runs Windows Server 2008 or Windows Server 2008 R2. Then with both of the new servers up as member servers I ran dcpromo on DC1 using the advanced option and added it successfully to my existing domain. It's roles are GC, DNS and Active Directory Domain Services. I transferred The PDC Emulator, RID Pool Manager, and Infrastructure Master roles to DC1. The Schema Master and Domain Naming master are still on DC01. The first issue that I'm encountering is when I dcpromo the DC2 and select "Replicate data over the network from and existing domain controller" I select that I want to replicate from DC1 and I get the following error: Failed to identify the requested replica partner (dc1.xxx.org) as a valid domain controller with a machine account for (DC2$). This is likely due to either the machine account not being replicated to this domain controller because of replication latency or the domain controller not advertising the Active Directory Domain Services. Please consider retrying the operation with \dc01.xxx.org as the replica partner. "The server is unwilling to process the request. Is this because the Schema Master and Domain Naming Master roles are still on the old DC01? And if so, if I transfer Schema Master and Domain Naming Master roles to DC1 what is the risk or breaking my AD? I'm a little paranoid because this process HAS to be transparent. ANY down time or interruption will result in me getting a verbal ass kicking from my I.T. Director. Both of the new servers DNS point the the old DNS servers (DC01 and DC02) not themselves by the way.

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• OpenVZ: Choosing right MySQL-Server depending on host

  - by Scheintod

  What I have: Two servers running Wheezy/OpenVZ with One MySQL container on each host master/master replicated (mysql1/mysql2) Replicated DNS on each host (dns1/dns2) different web-containers on each host but regulary backuped to the other. What I want: Each container should use the "local" MySQL-Server (the one which runs on the same hardware-node). I'd like to be able to move the web-containers between the to hosts. Each container should choose the MySQL-Server (semi) automatically. This scheme should continue working if one host is down. What I tried: Currently I'm keeping track on which container should run on which host by DNS entries which are queries by scripts e.g. for questions like: "Which container should be backuped on/to which host." For choosing the right MySQL server I have one extra entry like "mysql.container_abc" which resolves to either mysql1/mysql2. So in the applications in the container I can use "mysql.container_abc" for e.g. mysql_connect and if I want to move the container around I just need to change the dns. Now I notices one problem with this approach: Every mysql_connect generates one DNS query because the dns is not cached and this slows the request down unnecessarily. What I would like better: Some way of passing the information on which host we are running to the container and using it directly instead of using DNS. E.g. some way of setting a custom /etc/hosts entry in the container. Or any other great idea. Doesn't have to include DNS but shouldn't require to much special "magic" inside the container.

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• How does Tunlr work?

  - by gravyface

  For those of you not in the US, Tunlr uses DNS witchcraft to allow you to access US-only (and UK-only stuff like BBC radio online) services and Websites like Hulu.com, etc. without using traditional methods like a VPN or Web proxy. From their FAQ: Tunlr does not provide a virtual private network (VPN). Tunlr is a DNS (domain name system) unblocking service. We’re using sophisticated technologies (a.k.a. the Tunlr Secret Sauce ©) to re-adress certain data envelopes, tricking the receiver into thinking the envelope originated from within the U.S. For these data envelopes, Tunlr is transparently creating a network tunnel from your location to our U.S.-based servers. Any data that’s not directly related to the video or music content providers which Tunlr supports is not only left untouched, it’s also not even routed through Tunlr. In order to use Tunlr, you will have to change the DNS address. See Get started for more information. I can't really wrap my head around how this works; I have always assumed that these services performed a geolocation lookup via your client IP. Just really curious as to how this works. EDIT 2 I believe they're only proxying the initial geo check and then modifying the data stream request to include your real IP address so that the streaming is direct, not proxied.

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• Re-installing Windows on an old laptop

  - by Khaled

  I have an old laptop and I want to re-install Windows XP on it. The problem is that this laptop does not have an optical drive. I checked the boot sequence in the BIOS. It does not show an option to boot from USB. It have only two options: Boot from HD. Boot using Realtek agent (network boot). I tried to copy the Windows CD to second drive D:\ and run the installed from there. However, I could not format the C:\ drive. Windows complaints about setup files will be removed or something like that. I tried to boot the laptop using PXE, but I could not. It seems that the DHCP request did not get answered. I thought I could use a USB CD-ROM drive (I don't have one to try), but it might not work as there is no option to boot from USB. Do you think it will work? Do I have other options to try? Any recommendations?

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• nginx with ssl: I get a 403 and log "directory index of '...dir...' is forbidden" log message. works fine with unencrypted connection

  - by user72464

  As mentioned in the title, I had nginx working fine with my rails app, until I tried to add the ssl server. The unencrypted connection still works but the ssl always returns me a 403 page with the following line in the error log: directory index of "/home/user/rails/" is forbidden, client: [my ip], server: _, request: "GET / HTTP/1.1", host: "[server ip]" Below my nginx.conf server block: server { listen 80; listen 443 ssl; ssl_certificate /etc/ssl/server.crt; ssl_certificate_key /etc/ssl/server.key; client_max_body_size 4G; keepalive_timeout 5; root /home/user/rails; try_files $uri/index.html $uri.html $uri @app; location @app { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://0.0.0.0:8080; } error_page 500 502 503 504 /500.html; location = /500.html { root /home/user/rails; } } the /home/user/rails directory and it's parent have all read to all rights. and they belong to the user nginx. the certificate and key file have the following rights: -rw-r--r-- 1 nginx root 830 Nov 8 09:09 server.crt -rw--w---- 1 nginx root 887 Nov 8 09:09 server.key any clue?

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• 'Bug in Mailman version 2.1.12'

  - by davorg

  I'm working on setting up a server running Plesk 10.4.4 Update #13 on Centos 6.2. I've configured Mailman and now I want to set up some mailing lists. I've created a list in the Plesk control panel, but when I try to administer the new list (by visiting http://lists.[domain].com/mailman/admin/[listname] I see the following error: Bug in Mailman version 2.1.12 We're sorry, we hit a bug! Please inform the webmaster for this site of this problem. Printing of traceback and other system information has been explicitly inhibited, but the webmaster can find this information in the Mailman error logs. I see exactly the same error if I try to go to the list info page at http://lists.[domain].com/mailman/listinfo/[listname]. I would follow the instructions and look in the error logs, but I can't find them. I would expect to find a file at /var/log/mailman/error, but there's nothing there. My test list seems to work correctly. It sends all the expected email. It's just the web pages for the list that seem to be broken. Has anyone else seen this? Any suggestions for tracking down and fixing the problem? p.s. I think I've chosen the correct Stack Exchange site, but it this question would be better asked elsewhere, please let me know. Update: I got to the bottom of this, so I'm documenting the answer in case anyone else has the same problem. The fact that I couldn't find the error log was the clue. The problem was that the Mailman process didn't have permissions to create an error log. And it seems that if Mailman can't create an error log then it will respond to any web request with this error page. Creating an error log file (in /var/log/mailman/error) and giving it the correct permissions fixed the problem.

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• Windows: disable remote access of local drive, even by domain admin

  - by Matt

  We have a network of Windows 7 PCs that are managed as part of a domain. What we want is for the domain admin to be unable to view the PC's local drive (C:) unless he is physically at the PC. In other words, no remote desktop and no ability to use UNC. In other words, the domain admin should not be allowed to put \\user_pc\c$ in Windows Explorer and see all the files on that computer, unless he is physically present at the PC itself. Edit: to clarify some of the questions/comments that have come up. Yes, I am an admin---but a complete Windows novice. And yes, for the sake of this and my similar questions, it is fair to assume that I am working for someone who is paranoid. I understand the arguments about this being a "social problem versus a technical problem", and "you should be able to trust your admins", etc. But this is the situation in which I find myself. I'm basically new to Windows system administration, but am tasked with creating an environment that is secure by the company owner's definition---and this definition is clearly very different from what most people expect. In short, I understand that this is an unusual request. But I'm hoping there is enough expertise in the ServerFault community to point me in the right direction.

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• Courier-imap login problem after upgrading / enabling verbose logging

  - by halka

  I've updated my mail server last night, from Debian etch to lenny. So far I've encountered a problem with my postfix installation, mainly that I managed to broke the IMAP access somehow. When trying to connect to the IMAP server with Thunderbird, all I get in mail.log is: Feb 12 11:57:16 mail imapd-ssl: Connection, ip=[::ffff:10.100.200.65] Feb 12 11:57:16 mail imapd-ssl: LOGIN: ip=[::ffff:10.100.200.65], command=AUTHENTICATE Feb 12 11:57:16 mail authdaemond: received auth request, service=imap, authtype=login Feb 12 11:57:16 mail authdaemond: authmysql: trying this module Feb 12 11:57:16 mail authdaemond: SQL query: SELECT username, password, "", '105', '105', '/var/virtual', maildir, "", name, "" FROM mailbox WHERE username = '[email protected]' AND (active=1) Feb 12 11:57:16 mail authdaemond: password matches successfully Feb 12 11:57:16 mail authdaemond: authmysql: sysusername=<null>, sysuserid=105, sysgroupid=105, homedir=/var/virtual, [email protected], fullname=<null>, maildir=xoxo.sk/[email protected]/, quota=<null>, options=<null> Feb 12 11:57:16 mail authdaemond: Authenticated: sysusername=<null>, sysuserid=105, sysgroupid=105, homedir=/var/virtual, [email protected], fullname=<null>, maildir=xoxo.sk/[email protected]/, quota=<null>, options=<null> ...and then Thunderbird proceeds to complain that it cant' login / lost connection. Thunderbird is definitely not configured to connect through SSL/TLS. POP3 (also provided by Courier) is working fine. I've been mainly looking for a way to make the courier-imap logging more verbose, like can be seen for example here. Edit: Sorry about the mess, I've found that I've been funneling the log through grep imap, which naturally didn't display entries for authdaemond. The verbose logging configuration entry is found in /etc/courier/imapd under DEBUG_LOGIN=1 (set to 1 to enable verbose logging, set to 2 to enable dumping plaintext passwords to logfile. Careful.)

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• Apache inflate application/ with mod_filter

  - by BGT

  I need to prevent pdf objects from being gzipped. Really, this only needs to take place if the request is from the Mozilla browser (but since I can't get something as seemingly simple as no-gzip for application/pdf, I figure it's wiser to start there). From looking at the apache documentation on mod_filter, I've got the following: <Location /> FilterDeclare gzipDeflate CONTENT_SET FilterDeclare gzipInflate CONTENT_SET FilterProvider gzipDeflate deflate req=User-Agent $Mozilla/ FilterProvider gzipInflate inflate resp=Content-Type $application/ FilterChain +gzipDeflate +gzipInflate </Location> From my testing, the gzipDeflate filter is doing its job and all the pages without the Content-Type starting with application are being gzipped. But, the gzipInflate doesn't seem to be working at all. I've inspected the response in Firebug and verified that the Content-Type being sent down is application/pdf. I'll go ahead and ask a potentially stupid question though: The response's Content-Type header in its entirety read "application/pdf; charset=Windows-1252". Does that make any sort of difference or is $application/ presumably enough to catch that? Any help is greatly appreciated. One other point, the URL that returns the pdf object does not have the .pdf extension. The pdf itself is stored in an Oracle database as a blob and appended to the page when appropriate (all the urls in the system use the same baseline). This was part of an original inquiry by a helpful member at stackoverflow who pointed me towards mod_filter and suggested I post the question here.

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• Calling Excel from PHP 5 through COM fails on Windows 7 when Apache started through Task Planner

  - by Stefan Pantke

  I currently write an application, which controls Excel through COM: The app creates a COM-based Excel instance, opens some XLS files and reads their contents. Scenario I On Windows 7, I start Apache and mySQL using xmapp-control with system administrator rights. All works as expected. The PHP-based controller script interacts with Excel as expected. Scenario II A problem appears, if I start Apache and mySQL as 'background jobs'. Here is how: I created two jobs using Windows 7 Task Planner. One runs apache_start.bat, the other runs mysql_start.bat. Both tasks run as SYSTEM with elevated privileges when Windows 7 boots. Apache and mySQL work as expected. Specifically, Apache serves HTTP request from clients and PHP is able to talk to mySQL. When I call the PHP controller, which calls and interacts with Excel using COM, I do receive an error. The error seems to come from Excel [not COM itself] and reads like this: Excel can't read the XLS-file Excel failed to save the file due to an ill-name worksheet Interestingly, during the first run of the PHP-based controller script, it takes a few seconds to render the error message. Each subsequent run immediately renders the error message. Windows system logs didn't show a single problem report entry. Note, that the PHP program and the Apache instance didn't change - except the way Apache was started. At least the PHP controller script is perfectly able to read the file-system, since it provides the pathes to the XLS-file through scandir() of a certain directory. Concurrency issues can't be the cause of the problem. A single instance of the specific PHP controller interacts with Excel. Question Could someone provide details, why this happens?

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• Apache2 Re-Routing from Domain Name to Internal IP Address

  - by Richard Grey

  The problem that I am having, is that when someone goes to my domain name example.co.uk, for some reason, apache seems to be re-routing the request to the internal IP address of the server, i.e. 192.168.0.52 My Apache2 default sites enabled file is as follows: ServerAdmin [email protected] ServerName trusteeguard.co.uk ServerAlias www.trusteeguard.co.uk DocumentRoot /var/www <Directory /> Options FollowSymLinks AllowOverride All </Directory> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride All Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/trusteeguard-error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/trusteeguard-access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride All Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> This is an Ubuntu box if that is any help ;)

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• Which AMI to to use for Java/Tomcat/MySQL in Amazon EC2?

  - by Justin

  I originally posted this on stackoverflow.com and it was suggested serverfault.com might be a better place to ask this question. So here goes: I'm trying to determine which Amazon Machine Image (AMI) to use as my Virtual Server in Amazon's EC2. For now, I'll need to choose an AMI that complies with the AWS Free Usage Tier. I want to deploy a Java app that I've been developing using Eclipse on Windows XP, Tomcat 7 and MySQL 5.5. I'm aware that I can choose the Basic 32-bit Amazon Linux AMI. Then I'd manually install Tomcat and MySQL (does MySQL get installed on the image or separately on an Elastic Block Store (EBS)?). Here's the rub, I'm a bit of a Linux noob. I can start Tomcat and tail the logs and such on Linux but I'm not familiar with the install process for Tomcat and MySQL on Linux and commands like sudo and chmod. I'm happy to get more hands on with Linux but I'm short on time right now. Are there AMI's that already have Tomcat and MySQL bundled? The Request Instance Wizard shows 805 Community AMI's that are Free Tier Eligible. 51 of the Free Tier Eligible AMI's have "Tomcat" in their name. I'm willing to consider using Elastic Beanstalk but my research thus far hasn't found any discussion of using MySQL with Beanstalk. The discussions all seem to use Amazon's SimpleDB. Any advice is greatly appreciated.

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• Is TortoiseSVN really this buggy?

  - by John Isaacks

  I have been using tortoise svn for a couple weeks now. I get errors very often. Almost everything I do creates an error. this is with repositories on the internet, locally on my machine or a machine on the network. So I started to keep track. Some examples are below. 12/31/2010 Can't move 'C:\Users\jisaacks\Desktop\my branch test.svn\tmp\entries' to 'C:\Users\jisaacks\Desktop\my branch test.svn\entries': The file or directory is corrupted and unreadable. 01/04/2011 Commit failed (details follow): Server sent unexpected return value (405 Method Not Allowed) in response to MKCOL request for '/svn/kranichs-svn/!svn/wrk/b316f15e-0869-4644-9c53-87aa0103506b/branches' 01/06/2011 Can't move 'C:\Users\jisaacks\Desktop\DVD Catalog\vendors.svn\tmp\entries' to 'C:\Users\jisaacks\Desktop\DVD Catalog\vendors.svn\entries': The file or directory is corrupted and unreadable. 01/06/2011 Can't move 'C:\Users\jisaacks\Desktop\DVD Catalog\cake\tests\test_app\views\layouts.svn\tmp\entries' to 'C:\Users\jisaacks\Desktop\DVD Catalog\cake\tests\test_app\views\layouts.svn\entries': The file or directory is corrupted and unreadable. 01/06/2011 Commit failed (details follow): attempt to write a readonly database attempt to write a readonly database That last one about the read only database happens every time I commit. Say if I am working on the head revision (7) in a working copy. I make a change and commit it. It gives me this error. But if I look at the log it tells me that there is now a revision 8 (the commit I just made) but I am still on revision 7. So I need to run update to be on the current revision that I just commited. I hope I explained that clearly. Anyways with all these errors I wonder.. Is TSVN just this unstable, does everyone have these issues. Or is it just me? If just me, what could I be doing wrong?

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• CDN Rerouting on 404 (file not yet in synch with original storage)

  - by Alan Ristic

  Here is the problem. I've setup my app(on EC2) to store uploaded images directly on Amazon S3. I'd like to be able to serve static files(cdn) from my 'home' server so I wrote script that does sync from S3. But there is a window of (at least) one minute in synch. Now I see two solutions on the problem of pics not been available on 'home' server here: 1.I write script on EC2 (where the app resides) to fetch from DB pics that have status of "not-yet-synch", which is default state when user uploads picture. The script then does a ping to picture and if it gets OK response, updates DB from "not-yet-synch" to "synch". 2.Prefered solution would be to let apache (in this case) redirect request for an image if it sees 404 (e.g. doesent find image requested) to S3. This way I wouldn't need script from solution 1. So what approach do you suggest I take in solving this redundancy problem? Or what is practice in production environments? To further clarify; I'd like so serve images first from 'home' server, if that fails serve them from S3. Tnx, Alan

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• Insufficient channel capacity of 1GBit

  - by Roman S

  There is a Caching Server (Varnish): it receives data from Amazon S3 on request, saves it for some time and gives it to the client. We have encountered the problem of insufficient channel capacity of 1GBit. Peak load within 4 hours completely chokes the channel. Server performance is sufficient for now. Approximately 4.5TB of data are transmitted per day. More than 100TB are accumulated per month. The first thought that comes to mind is simply to add one more 1GBit port and sleep peacefully until 2GBit are not enough (it may happen quite quickly) or one server is not able to handle it. And then we just need to add new Caching Servers. But now we need a Load Balancer, which will send requests on one and the same URL, always on one and the same server (to avoid multiple copies of the same cached objects). Here are the questions: Does a Balancer need a band equal to sum of all bands of Caching Servers? What shall we do in case there are no ports in a Balancer? Should we add more Balancers or solve the problem by means of Round robin DNS? What are the standard approaches to such problems? Can anyone advise hosting-companies, which can solve this problem? We are interested in American and European markets.

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• Odd log entries when starting up PotgreSQL

  - by Shadow

  When restarting pgSQL, I get the following log entries: 2010-02-10 16:08:05 EST LOG: received smart shutdown request 2010-02-10 16:08:05 EST LOG: autovacuum launcher shutting down 2010-02-10 16:08:05 EST LOG: shutting down 2010-02-10 16:08:05 EST LOG: database system is shut down 2010-02-10 16:08:07 EST LOG: database system was shut down at 2010-02-10 16:08:05 EST 2010-02-10 16:08:07 EST LOG: autovacuum launcher started 2010-02-10 16:08:07 EST LOG: database system is ready to accept connections 2010-02-10 16:08:07 EST LOG: connection received: host=[local] 2010-02-10 16:08:07 EST LOG: incomplete startup packet 2010-02-10 16:08:07 EST LOG: connection received: host=[local] 2010-02-10 16:08:07 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:08 EST LOG: connection received: host=[local] 2010-02-10 16:08:08 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:08 EST LOG: connection received: host=[local] 2010-02-10 16:08:08 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:09 EST LOG: connection received: host=[local] 2010-02-10 16:08:09 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:09 EST LOG: connection received: host=[local] 2010-02-10 16:08:09 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:10 EST LOG: connection received: host=[local] 2010-02-10 16:08:10 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:10 EST LOG: connection received: host=[local] 2010-02-10 16:08:10 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:11 EST LOG: connection received: host=[local] 2010-02-10 16:08:11 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:11 EST LOG: connection received: host=[local] 2010-02-10 16:08:11 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:12 EST LOG: connection received: host=[local] 2010-02-10 16:08:12 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:12 EST LOG: connection received: host=[local] 2010-02-10 16:08:12 EST FATAL: password authentication failed for user "postgres" 2010-02-10 16:08:12 EST LOG: connection received: host=[local] 2010-02-10 16:08:12 EST LOG: incomplete startup packet My question regarding a potential consequence of this is posted here: http://stackoverflow.com/questions/2238954/mdb2-says-connection-failed-db-logs-say-otherwise , but I didn't realize this was happening when I asked that question, and I figured this [part of the] problem is for SF. Edit: I can connect to the database and manipulate things normally with the psql CLI and the postgres user.

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• What performance degradation to expect with Nginx over raw Gunicorn+Gevent?

  - by bouke

  I'm trying to get a very high performing webserver setup for handling long-polling, websockets etc. I have a VM running (Rackspace) with 1GB RAM / 4 cores. I've setup a very simple gunicorn 'hello world' application with (async) gevent workers. In front of gunicorn, I put Nginx with a simple proxy to Gunicorn. Using ab, Gunicorn spits out 7700 requests/sec, where Nginx only does a 5000 request/sec. Is such a performance degradation expected? Hello world: #!/usr/bin/env python def application(environ, start_response): start_response("200 OK", [("Content-type", "text/plain")]) return [ "Hello World!" ] Gunicorn: gunicorn -w8 -k gevent --keep-alive 60 application:application Nginx (stripped): user www-data; worker_processes 4; pid /var/run/nginx.pid; events { worker_connections 768; } http { sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; upstream app_server { server 127.0.0.1:8000 fail_timeout=0; } server { listen 8080 default; keepalive_timeout 5; root /home/app/app/static; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://app_server; } } } Benchmark: (results: nginx TCP, nginx UNIX, gunicorn) ab -c 32 -n 12000 -k http://localhost:[8000|8080]/ Running gunicorn over a unix socket gives somewhat higher throughput (5500 r/s), but it still does't match raw gunicorn's performance.

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• What does "incoming" and "outgoing" traffic mean?

  - by mgibsonbr

  I've seen many resources explaining how to set up a server's firewall to allow incoming and outgoing traffic on HTTP standard ports (80 and 443), but I can't figure out why I would need either of them. Do I need to unblock both for a "regular" web site to work? For file uploads to work? Are there situations where it would be advisable to unblock one and leave the other blocked? Sorry if that's a basic question, but I couldn't find it explained anywhere (also I'm not a native english speaker). I know in a "regular" web site the client is always the one who initiates a request, so I'm assuming a web server must accept incoming traffic on those ports, and my common sense tells me the server is allowed to send a response without unblocking anything else (otherwise it wouldn't make sense to have two types of rules). Is that correct? But what is an outgoing web (service) traffic, and what would be its use? AFAIK if the server wanted to initiate a connection with another machine, the specific port that matters is the one in the other end (i.e. the destination port would be 80), on its end any free port could be used (the source port would be random). I can open HTTP requests from my server (using wget for instance) without unblocking anything. So I'm assuming my concepts of "incoming" and "outgoing" are wrong somehow.

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• nginx- Rewrite URL with Trailing Slash

  - by Bryan

  I have a specialized set of rewrite rules to accommodate a mutli site cms setup. I am trying to have nginx force a trailing slash on the request URL. I would like it to redirect requests for domain.com/some-random-article to domain.com/some-random-article/ I know there are semantic considerations with this, but I would like to do it for SEO purposes. Here is my current server config. server { listen 80; server_name domain.com mirror.domain.com; root /rails_apps/master/public; passenger_enabled on; # Redirect from www to non-www if ($host = 'domain.com' ) { rewrite ^/(.*)$ http://www.domain.com/$1 permanent; } location /assets/ { expires 1y; rewrite ^/assets/(.*)$ /assets/$http_host/$1 break; } # / -> index.html if (-f $document_root/cache/$host$uri/index.html) { rewrite (.*) /cache/$host$1/index.html break; } # /about -> /about.html if (-f $document_root/cache/$host$uri.html) { rewrite (.*) /cache/$host$1.html break; } # other files if (-f $document_root/cache/$host$uri) { rewrite (.*) /cache/$host$1 break; } } How would I modify this to add the trailing slash? I would assume there has to be a check for the slash so that you don't end up with domain.com/some-random-article//

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• HP Proliant DL380 G4 - Can this server still perform in 2011?

  - by BSchriver

  Can the HP Proliant DL380 G4 series server still perform at high a quality in the 2011 IT world? This may sound like a weird question but we are a very small company whose primary business is NOT IT related. So my IT dollars have to stretch a long way. I am in need of a good web and database server. The load and demand for a while will be fairly low so I am not looking nor do I have the money to buy a brand new HP Dl380 G7 series box for $6K. While searching around today I found a company in ATL that buys servers off business leases and then stripes them down to parts. They clean, check and test each part and then custom "rebuild" the server based on whatever specs you request. The interesting thing is they also provide a 3-year warranty on all their servers they sell. I am contemplating buying two of the following: HP Proliant DL380 G4 Dual (2) Intel Xeon 3.6 GHz 800Mhz 1MB Cache processors 8GB PC3200R ECC Memory 6 x 73GB U320 15K rpm SCSI drives Smart Array 6i Card Dual Power Supplies Plus the usual cdrom, dual nic, etc... All this for $750 each or $1500 for two pretty nicely equipped servers. The price then jumps up on the next model up which is the G5 series. It goes from $750 to like $2000 for a comparable server. I just do not have $4000 to buy two servers right now. So back to my original question, if I load Windows 2008 R2 Server and IIS 7 on one of the machines and Windows 2008 R2 server and MS SQL 2008 R2 Server on another machine, what kind of performance might I expect to see from these machines? The facts is this series is now 3 versions behind the G7's and this series of server was built when Windows 200 Server was the dominant OS and Windows 2003 Server was just coming out. If you are running Windows 2008 R2 Server on a G4 with similar or less specs I would love to hear what your performance is like.

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• Outlook locking network connection/session?

  - by HaydnWVN

  Scenario: We have an 'automatic orders' machine sat in the corner running XP with Outlook 2003. Its job is to check for new emails on a specific account, when it encounters one it checks the e-mail body for specific wording to determine which customer it is from (using a macro), then it checks the attachment for specific order codes before parsing the attachment to create a .csv file (which is then e-mailed onto one of the sales team) before importing the .csv into our bespoke ERP/Sales Order system to create an order. Problem: Periodically the machine will have symptoms of a lost network connection (unable to connect to any network source). Sometimes after several days, sometimes over a week. Volume of emails/orders processed does not seem to be linked. Additional info: The machines .pst is stored on a mapped network location. The .csv created is stored on a mapped network location. This is a workgroup, not a domain. All network drives are Samba shares from an Ubuntu fileserver. Our bespoke system runs from a database (MySQL) Ubuntu server. Our troubleshooting so far: I have switched machines (previous was Win2000) with the same symptoms. Restarting the machine FIXES the problem. Closing Outlook and then end tasking an Outlook.exe background process FIXES the problem. If you close Outlook, without end taking the background process, outlook will not reopen (saying it cannot find the pst file & it will not open any network location). Does Outlook have some kind of 'max session' linking it to network activity that is not closing after a mail request? Could Auto-archive be causing this? Is there a tool to check/display what each outlook.exe process is doing? Have not found many ways to troubleshoot this yet, as it is so infrequent...

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• What's the piece of hardware listening on Facebook's or Wikipedia's IP address?

  - by Igor Ostrovsky

  I am trying to understand how massive sites like Facebook or Wikipedia work, for my intellectual curiosity. I read about various techniques for building scalable sites, but I am still puzzled about one particular detail. The part that confuses me is that ultimately, the DNS will map the entire domain to a single IP address, or a handful of IP addresses in the case of round-robin DNS. For example, wikipedia.org has only one type-A DNS record. So, people from all over the world visiting Wikipedia have to send a request to the one IP address specified in DNS. What is the piece of hardware that listens on the IP address for a massive site, and how can it possibly handle all the load coming from the requests for users all over the world? Edit 1: Thanks for all the responses! Anycast seems like a feasible answer... Does anyone know of a way to check whether a particular IP address is anycast-routed, so that I could verify that this really is the trick used in practice by large sites? Edit 2: After more reading on the topic, it appears that anycast is not typically used for dynamic web content. Anycast is usually used for UDP (e.g., DNS lookups), or sometimes for static content. One interesting thing to note is that Facebook uses profile.ak.fbcdn.net to host static content like style sheets and javascript libraries. Each time I ping this name, I get a response from a different IP address. However, I can't tell whether this is anycast in action, or a completely different technique. Back to my original question: as far as I can tell, even a large site will have a single expensive piece of load-balancing hardware listening on its handful of public IP addresses.

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• SSH Interactive mode not working

  - by Ekin Koc

  I have a Debian based linux server running for a year or so, without any problems. A couple of days ago, ssh interactive mode stopped working for no reason. I mean, I can open an ssh connection just fine, the server greets me with shell but I just can't type anything. However, if I send commands like this: ssh [email protected] cat /var/log/messages, I get the response. I dug through several logs and found one message, which feels remotely relevant to the problem; sh kernel: [10222733.062511] ------------[ cut here ]------------ sh kernel: [10222733.062522] WARNING: at /build/buildd-linux-2.6_2.6.32-39-amd64-7yVIH2/linux-2.6-2.6.32/debian/build/source_amd64_none/drivers/char/tty_ldisc.c:738 tty_ldisc_reinit+0x46/0x7b() sh kernel: [10222733.062526] Hardware name: PowerEdge R210 II sh kernel: [10222733.062528] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables sha1_generic arc4 ecb ppp_mppe ppp_async crc_ccitt ppp_generic slhc loop snd_pcm snd_timer snd soundcore snd_page_alloc i2c_i801 i2c_core pcspkr evdev joydev dcdbas container button processor ext3 jbd mbcache sg sd_mod sr_mod crc_t10dif cdrom usb_storage usbhid hid mpt2sas ahci ehci_hcd libata scsi_transport_sas usbcore bnx2 nls_base scsi_mod fan thermal thermal_sys [last unloaded: scsi_wait_scan] sh kernel: [10222733.062568] Pid: 8662, comm: sshd Not tainted 2.6.32-5-amd64 #1 sh kernel: [10222733.062569] Call Trace: sh kernel: [10222733.062572] [<ffffffff811ff056>] ? tty_ldisc_reinit+0x46/0x7b sh kernel: [10222733.062574] [<ffffffff811ff056>] ? tty_ldisc_reinit+0x46/0x7b Is there any way to get back the sshd working in interactive mode? I tried restarting sshd but that is no help. And somehow, I can not reboot the server. Tried sending shutdown -r now and reboot but it refuses to go down. Should I go ahead and request a physical reboot?

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