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• Problem posting multipart form data using Apache with mod_proxy to a mongrel instance

  - by Ryan E

  I am attempting to simulate my site's production environment as closely as I can on my local machine. This is a rails site that uses Apache w/ mod_proxy to forward requests to a mongrel cluster. On my Mac OSX Leopard machine, I have the default install of apache running and have configured a vhost to use mod_proxy to to forward requests to a local running mongrel instance on port 3000. <Proxy balancer://mongrel_cluster-development> BalancerMember http://127.0.0.1:3000 </Proxy> For the most part, this is working fine. I can browse my development site using the ServerName of the vhost I configured and can confirm that requests are being properly forwarded to the mongrel instance. However, there is a page on the site that has a multipart form that is used to upload an image to the server. When I post this form, there is a delay of about 5 minutes and the browser ultimately returns a Bad Request Your browser sent a request that this server could not understand. In the error log for my vhost: [Tue Sep 22 09:47:57 2009] [error] (70007)The timeout specified has expired: proxy: prefetch request body failed to 127.0.0.1:3000 (127.0.0.1) from ::1 () This same form works fine if I browse directly to the mongrel instance (http://127.0.0.1:3000). Anybody have any idea what the problem might be and how to fix it? If there is any important information that I neglected to include, post a comment, and I can add to this question. Note: Upon further investigation, this appears to be a problem specific to Safari. The form works fine in Firefox.

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• Have set Expiration time: Still getting "Query string present but no explicit expiration time"

  - by oligofren

  I have one local Apache instance running with mod_cache (+ disk & mem) enabled, and it seems to cache content from my appserver fine. My app server sets Expiration headers and Last-modified. Yet, when deploying on a production server with the same modules enabled, I am getting the following error in my logs: blablabla not cached. Reason: Query string present but no explicit expiration time Any clues on why Apache is not caching content? The only difference is the Apache version. Locally I am running 2.2. This is from my config CacheRoot "/var/cache/apache2/" CacheEnable disk / This is example output < HTTP/1.1 200 OK < Date: Mon, 19 Nov 2012 16:09:13 GMT < Server: Sun GlassFish Enterprise Server v2.1.1 < X-Powered-By: Servlet/2.5 < Expires: Tue Nov 20 05:00:00 CET 2012 < Last-Modified: Mon Nov 19 17:09:13 CET 2012 < Cache-Control: no-transform < Content-Type: application/x-javascript < Transfer-Encoding: chunked

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• Vagrant synced folders aren't case sensitive

  - by lvmisooners

  For our web stack, we are moving from a Windows Server to CentOS. To facilitate development, we're utilizing Vagrant to run CentOS VMs locally. We're using Vagrant's Synced Folders feature to allow devs to use their favorite IDEs on their host machine, but we're finding that one key feature is missing from this setup: file system case sensitivity. The synced folder inside the VM apparently takes on the properties of the host's file system, so if I'm developing from a Windows machine, or even OSX, the file system isn't case sensitive. This is a big issue, as our production servers will be pure CentOS, and its file system will be case sensitive. Case sensitivity is one of the main reasons we wanted to have a local VM. We want to prevent "It works on my machine!" Some workarounds we've considered or tried: Use lsyncd to sync from the vagrant share to a location within the VM that is case sensitive updating files on the host doesn't seem to generate the events in the VM that lsync listens to Make a case-sensitive partition on the host (Doesn't work for Windows) Use samba this may be an option, but we haven't vetted it yet. Is there a better way? Note that we have developers using Windows, OS X, and Ubuntu, and the solution needs to work everywhere.

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• NFS "Permission Denied" getting cached on NetApp Filer

  - by Christopher Karel

  We have a bunch of Linux boxes mounting NFS shares off a NetApp filer. From time to time, I will flub some part of the export configuration. Typo on one of the allowed hosts, incorrect IP address, etc, etc. No worries, this is usually done on a test system, or with brand new exports that aren't yet in production. However, I've found that once I've been denied permission to mount something from a Linux machine, the failure gets cached for as long as a day. I will correct the problem that was blocking the mount, re-export on the NetApp, and still not be able to mount the share. I'm pretty sure this caching is done at the NetApp side. It normally ages out after a day or so, but it really sucks having to wait until tomorrow to mount a share. I've tried exportfs -f on the NetApp, as well as dns flush. (I found both suggestions via Google) However, neither one works. I would sell my soul if someone could help out with a command/pagan ritual that would clear up this cache issue. --Christopher Karel

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• ASP.Net application can no longer write to DB after having run out of disk space

  - by remi.despres-smyth

  I'm a software developer troubleshooting a sticky problem on a client's production server, and I've got a bit of a problem. They have a virtual server running Windows Server 2008, SQL Server 2008 R1 and IIS7. It was provisioned with two partitions: one that has the OS (~15 Gig), and the other has IIS' web sites (another ~15 Gig). My application that's running this server has been running perfectly well, up until about an hour ago, when it started throwing System.IO.IOException: "There is not enough space on disk". As soon as my client notified me, I cleared up some space on C:\, emptied the recycle bin, and restarted SQL Server and IIS. The web server came back up and the application was running, but it no longer saves information to the database. No error message is coming up, the application can get information out of the DB, but it can no longer save data back to it. I rebooted the server, to no effect. I spoke with a sys admin at the hosting company, and he says SQL Server appears to have come up fine and the database is not in read-only mode. I confirmed that, as I can add records to tables from SQL Server Management Studio. I looked at the event log immediately after trying to save an edited record in the app, and no new events appear in there that I can tell. I'm assuming this is related to having run out of space, as it was all working fine prior to that, but I'm at a bit of a loss as to what exactly needs a kick in the pants to get going again. Can anyone help me out? What the heck is going on here?

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• VMWare Server Windows 2008 NAT Problem

  - by David

  At my new job our workstations run Windows Server 2008. However, for the specific task for which I've been hired, I need to set up a couple Linux VMs. So I grabbed the free VMWare Server and created an Ubuntu image and a Slackware image. (The former to more closely mimic the production server, the latter because I'm more familiar with it.) For desktop security purposes I need to use NAT for the network access (I would have preferred bridged, but I'm told that would go against some policy here and my whole workstation would be sandboxed from the switch). However, I can't seem to get it working right. I can ping out from the VMs to LAN addresses as well as internet addresses. I can resolve DNS names. However, attempts to use a web browser or perform any kind of higher-level interaction like that just time out. Googling around yesterday led me to various workarounds that were similar, but didn't solve my specific situation. (For example, Norton firewall blocking the connection on the host, or even the Windows firewall.) I also saw some forum posts where people said it's a known issue with VMWare and Windows Server 2008 (and Windows 7). So far I haven't been able to find a suggestion that gets me past this roadblock. I'm really not very familiar with managing a Windows Server 2008 box, so it's possible there's just some security setting somewhere that I need to modify. Does anybody have any suggestions on where I should look? UPDATE: I'm now looking at the "Network and Sharing Center" on the host workstation and it shows "VMWare Network Adapter VMnet8" (which is what I'm using) as an "Unidentified network" with "No Internet access." Looks like I can't modify ICS under the group policy. Any suggestions on how to allow this connection to have internet access?

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• Experiences with BIRD for BGP?

  - by Shtééf

  We're currently using Quagga with Debian Linux to run a full table BGP router. The set-up has been dead simple up to now, but we've come to a point where I have to reconfigure the router quite a bit, and want to tighten things up. I've never really understood Quagga, and always found its documentation to be lacking. It appears to be mimicking Cisco, of which I only have basic understanding. BIRD has caught my eye recently. The couple of articles / presentations I found promote it as lightweight and more responsive under stress compared to Quagga. And it actually seems to have very decent documentation. So I'd like to know: Who's running BIRD right now, and in what kind of set-up? How is it stability-wise? I've read about it running in a couple of sites in production. Let's say I don't care at all for a Cisco-feel to configuration. How is configuration, maintainance, monitoring, etc. of BIRD in general? And any other notable experiences you may have with it.

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• Configuration management in support of scientific computing

  - by Sharpie

  For the past few years I have been involved with developing and maintaining a system for forecasting near-shore waves. Our team has just received a significant grant for further development and as a result we are taking the opportunity to refactor many components of the old system. We will also be receiving a new server to run the model and so I am taking this opportunity to consider how we set up the system. Basically, the steps that need to happen are: Some standard packages and libraries such as compilers and databases need to be downloaded and installed. Some custom scientific models need to be downloaded and compiled from source as they are not commonly provided as packages. New users need to be created to manage the databases and run the models. A suite of scripts that manage model-database interaction needs to be checked out from source code control and installed. Crontabs need to be set up to run the scripts at regular intervals in order to generate forecasts. I have been pondering applying tools such as Puppet, Capistrano or Fabric to automate the above steps. It seems perfectly possible to implement most of the above functionality except there are a couple usage cases that I am wondering about: During my preliminary research, I have found few examples and little discussion on how to use these systems to abstract and automate the process of building custom components from source. We may have to deploy on machines that are isolated from the Internet- i.e. all configuration and set up files will have to come in on a USB key that can be inserted into a terminal that can connect to the server that will run the models. I see this as an opportunity to learn a new tool that will help me automate my workflow, but I am unsure which tool I should start with. If any member of the community could suggest a tool that would support the above workflow and the issues specific to scientific computing, I would be very grateful. Our production server will be running Linux, but support for OS X would be a bonus as it would allow the development team to setup test installations outside of VirtualBox.

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• Configuration management in support of scientific computing

  - by Sharpie

  For the past few years I have been involved with developing and maintaining a system for forecasting near-shore waves. Our team has just received a significant grant for further development and as a result we are taking the opportunity to refactor many components of the old system. We will also be receiving a new server to run the model and so I am taking this opportunity to consider how we set up the system. Basically, the steps that need to happen are: Some standard packages and libraries such as compilers and databases need to be downloaded and installed. Some custom scientific models need to be downloaded and compiled from source as they are not commonly provided as packages. New users need to be created to manage the databases and run the models. A suite of scripts that manage model-database interaction needs to be checked out from source code control and installed. Crontabs need to be set up to run the scripts at regular intervals in order to generate forecasts. I have been pondering applying tools such as Puppet, Capistrano or Fabric to automate the above steps. It seems perfectly possible to implement most of the above functionality except there are a couple usage cases that I am wondering about: During my preliminary research, I have found few examples and little discussion on how to use these systems to abstract and automate the process of building custom components from source. We may have to deploy on machines that are isolated from the Internet- i.e. all configuration and set up files will have to come in on a USB key that can be inserted into a terminal that can connect to the server that will run the models. I see this as an opportunity to learn a new tool that will help me automate my workflow, but I am unsure which tool I should start with. If any member of the community could suggest a tool that would support the above workflow and the issues specific to scientific computing, I would be very grateful. Our production server will be running Linux, but support for OS X would be a bonus as it would allow the development team to setup test installations outside of VirtualBox.

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• Issue configuring Oracle database for SSL

  - by Santhosha Kaldambe

  Hello, I want to setup Oracle for SSL communication. I am not using SSL authentication for database user. As first requirement, generated self signed certificate using OpenSSL and added certificate to wallet. The wallet location is specified in server configuration. Created listener and it is starting however it does not provide any service. The default listener (non SSL) is working fine. When I execute LSNRCTL.EXE status SSLLISTENER it gives below output. STATUS of the LISTENER Alias SSLLISTENER Version TNSLSNR for 32-bit Windows: Version 11.1.0.6.0 - Production Start Date 14-NOV-2009 01:47:08 Uptime 16 days 22 hr. 14 min. 3 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File C:\app\Administrator\product\11.1.0\db_1\network\admin\listener.ora Listener Log File c:\app\administrator\diag\tnslsnr\\ssllistener\alert\log.xml Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=)(PORT =2484))) The listener supports no services The command completed successfully Here is exact content of various files after configuration. 1) File Name: tnsnames.ora ORCL = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT 1521)) ) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) ) 2) File Name: sqlnet.ora SSL_VERSION = 0 NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT) sqlnet.authentication_services= (NONE) tcp.validnode_checking = no tcp.invited_nodes=(PS0803.oraebs.com,PS2948,PS5098) SSL_CLIENT_AUTHENTICATION = FALSE WALLET_LOCATION = (SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = C:\app\Administrator\admin\orcl\Server_Wallet) ) ) 3) File Name: listener.ora SSL_CLIENT_AUTHENTICATION = FALSE WALLET_LOCATION = (SOURCE = (METHOD = FILE) (METHOD_DATA = (DIRECTORY = C:\app\Administrator\admin\orcl\Server_Wallet) ) ) LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521)) ) (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT 1521)) ) ) SSLLISTENER = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCPS)(HOST = )(PORT = 2484)) ) Thanks Santhosh

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• Nginx dynamic upstream configuration / routing

  - by Dan Sosedoff

  I was experimenting with dynamic upstream configuration for nginx and cant find any good solution to implement upstream configuration from third-party source like redis or mysql. The idea behind it is to have a single file configuration in primary server and proxy requests to various app servers based on environment conditions. Think of dynamic deployments where you have X servers that are running Y workers on different ports. For instance, i create a new app and deploy. App manager selects a server and then rolls out a worker (Ruby/PHP/Python) and then reports the ip:port to the central database with status "up". At this time when i go to the given url nginx should proxy all requests to the specified ip:port upstream. The whole thing is pretty similar to what heroku does, except this proof-of-concept is not supposed to be production ready, mostly for internal needs. The easiest solution i found was using resolver with ruby-based DNS server. It works, nginx gets the IP address correctly, but the only problem is that you cant define port number for that IP. Second solution (which i havent tried yet) is to roll something else as a proxy server, maybe written in Erlang. In this case we need to use something to serve static content. Any ideas how to implement this in more flexible and stable way? P.S. Some research options: http://openresty.org/#DynamicRoutingBasedOnRedis https://github.com/nodejitsu/node-http-proxy

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• SSL on nginx + unicorn got "Error 102 (net::ERR_CONNECTION_REFUSED)"

  - by panggi

  I tried to deploy my app on EC2 (opened port: 22, 80, 443) App: Rails 3.2.2 Server: nginx 1.2.1 unicorn gem (latest) ubuntu 12.04 Deployer: Capistrano I tried to follow the instruction in Railscasts : http://railscasts.com/episodes/335-deploying-to-a-vps (Sorry, it's a Pro Episode) Anything fine with normal port 80 http but i got Error 102 after trying to use SSL, here is the nginx.conf content: upstream unicorn { server unix:/tmp/unicorn.frontend.sock fail_timeout=0; } server { server_name beta.sukeru.com; listen 443 default; root /home/deployer/apps/appname/current/public; ssl on; ssl_certificate server.crt; ssl_certificate_key server.key; ssl_session_timeout 5m; ssl_protocols SSLv2 SSLv3 TLSv1; ssl_ciphers HIGH:!aNULL:!MD5; ssl_prefer_server_ciphers on; location / { proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto https; proxy_redirect off; proxy_pass http://unicorn; } error_page 500 502 503 504 /500.html; } In production.rb i set: config.force_ssl = true Can anyone give a solution for this? :)

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• VMWare Converter - Remote Linux Install P2V

  - by Zed Said

  I am trying to get what I thought was an easy process working. Here is my situation. I have a remote linux server (running Debian) that I would like to turn into a VM so that I can do testing on it rather than the production server. I downloaded VMWare Converter. I went to the "convert machine" wizard, chose Powered-on machine, entered my remote machine details. Clicking next shows that it correctly connects to my remote linux box. Now, on the next screen, for Destination type, it enters "WMWare Infrastructure virtual machine", and I can't change this. This is where I am stuck. Why do I need another sever to convert with? Is this where my VM gets sent to? And why can't I just convert the VM and save it on the computer that I am running the converter program on? If I do have to use a vmware infrastructure destination, I am confused at what ESX is, why and how I use it. Any help with this process would be more than appreciated!

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• SAN performance issues storing SQL Server tempdb on a SAN that's being backed up

  - by user42724

  I'm afraid I don't know much about SAN's so please forgive my lack of detail or technical terms. As a developer I've just completed and put on an existing production system a new application but it would appear to have tipped the scales regarding the performance of the backups being taken from the SAN. As I understand it there's a mirror of the SAN being taken usually constantly at the block-level. However, there seem to be so many new writes to the disk that the SAN mirroring/backup process can no longer keep up. I believe I've narrowed this down to SQL Servers tempdb which exists on a drive that contributes the largest portion of the problem! In fact I think tempdb has be contributing the largest portion of the issues all along regardless of my application! My question therefore is whether the tempdb should ever be mirrored or backed on the SAN and whether anyone else has gone through this sort of pain already? I'm wondering whether it's a best practise to make sure that tempdb is never mirrored on a SAN simply because any writes to it don't need to be saved. This also raises a slightly connected question - is it better to rely on SQL Servers built-in database backups tools (DB in full-recovery mode with full/differential and transaction log backups) or, as is the case with our application, SQL server is in simple recovery mode and never backed up since the SAN is mirrored and backed up? Many thanks

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• Running SSL locally on a hosts redirected domain name with Ubuntu and Apache

  - by Matthew Brown

  I recently made some changes to my Ubuntu computer so that a domain name resolved to my local copy of Apache. I edited /etc/hosts and added 127.0.0.1 thisbit.example.com Then set up a VirtualHost for the responses I wishes to create. That all works fine and my testing is now shooting on ahead without harm or risk tot he production server. Now for my next trick I need to test the authentication and so need to do this with HTTPS Basically https://auth.example.com needs to work on my PC without the SSL causing an issue which I imagine would be the case as I am clearly not the true https://auth.example.com but for the basis of this exercise I need to pretend that I am. Now it might be that the Apps I'm testing don't worry about checking the certificate. (Many are in Java which I'm no expert with). What gotchas am I likely to encounter and what is the best way of not letting my own hacks spoil my testing? I'm guessing the place to start is to enable SSL with Apcahe... I've never done that before as it has never come up before.

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• Why do weekly tasks created via PowerShell using a different user fail with error 0x41306

  - by Danny Tuppeny

  We have some scripts that create scheduled jobs using PowerShell as part of our application. When testing them recently, I noticed that some of them always failed immediately, and no output is ever produced (they don't even appear in the Get-Job list). After many days of tweaking, we've managed to isolate it to any jobs that are set to run weekly. Below is a script that creates two jobs that do exactly the same thing. When we run this on our domain, and provide credentials of a domain user, then force both jobs to run in the Task Scheduler GUI (right-click - Run), the daily one runs fine (0x0 result) and the weekly one fails (0x41306). Note: If I don't provide the -Credential param, both jobs work fine. The jobs only fail if the task is both weekly, and running as this domain user. I can't find information on why this is happening, nor think of any reason it would behave differently for weekly jobs. The "History£ tab in the Task Scheduler has almost no useful information, just "Task stopping due to user request" and "Task terminated", both of which have no useful info: Task Scheduler terminated "{eabba479-f8fc-4f0e-bf5e-053dfbfe9f62}" instance of the "\Microsoft\Windows\PowerShell\ScheduledJobs\Test1" task. Task Scheduler stopped instance "{eabba479-f8fc-4f0e-bf5e-053dfbfe9f62}" of task "\Microsoft\Windows\PowerShell\ScheduledJobs\Test1" as request by user "MyDomain\SomeUser" . What's up with this? Why do weekly tasks run differently, and how can I diganose this issue? This is PowerShell v3 on Windows Server 2008 R2. I've been unable to reproduce this locally, but I don't have a user set up in the same way as the one in our production domain (I'm working on this, but I wanted to post this ASAP in the hope someone knows what's happening!). Import-Module PSScheduledJob $Action = { "Executing job!" } $cred = Get-Credential "MyDomain\SomeUser" # Remove previous versions (to allow re-running this script) Get-ScheduledJob Test1 | Unregister-ScheduledJob Get-ScheduledJob Test2 | Unregister-ScheduledJob # Create two identical jobs, with different triggers Register-ScheduledJob "Test1" -ScriptBlock $Action -Credential $cred -Trigger (New-JobTrigger -Weekly -At 1:25am -DaysOfWeek Sunday) Register-ScheduledJob "Test2" -ScriptBlock $Action -Credential $cred -Trigger (New-JobTrigger -Daily -At 1:25am)

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• PHP 5.3 on IIS gives 404 error in CGI mode

  - by reinier

  Slowly losing my mind here. I had PHP 5.2 working fine (ISAPI) under IIS, but for some extension I needed 5.3. So no worries, I installed this but it turns out ISAPI is not supplied anymore. I followed the install tutorials for fastcgi and ended up with a 500 internal server error for every PHP page served. So my current situation is: I have fastcgi removed. In my websites I have added PHP (head, get, post) and routed them to c:\php\php-cgi.exe. Result: every PHP page I try (even the ones with just text) gives 404 not found error. Any HTML file I put in the same folder, serves without a hitch. Who can help me please... How hard can something like this be right? For me apparently very hard. Extra information: ran the installer as suggested below. Set it to use fastcgi. my fcgiext.ini file looks like this now: [types] php=c:\php\php-cgi.exe [c:\php\php-cgi.exe] exepath=c:\php\php-cgi.exe from the command-line a 3 line PHP file with just phpinfo(); works fine from the server the same PHP file with just phpinfo(); results in the internal server 500 error. from the server a PHP file with just text works fine when changing the document types in IIS management console and point the PHP extension directly to c:\php\php-cgi.exe results in 404 for every PHP file the php.ini is the php.ini.production file which came in the distribution. No edits were made. Setting the IIS PHP handler directly to PHP (not via fastcgi) c:\php\php-cgi.exe results in the following: display a PHP page with only text....works fine display a page with only phpinfo(); results in 404 not found

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• Which apache/mysql/php package is best for windows?

  - by crosenblum

  I have tried appservnetwork, was the best so far, but I haven't seen them do an update in ages, EasyPHP is just slow to load always. Wamp and Xamp, all put in their description that is not for production. I do not plan to host publicly this site or site's I am working on. But I do want a fast loading apache/mysql/php server for development purposes. I used to really like WLMP, which is Lighttpd for Windows, but that project seems unupdated or abandoned. I refuse to use IIS, but i have no desire to get into any wars over it. I run windows xp sp3 at my home pc. I will need to have a web server setup for professional work, as well as some fun websites I am working on. I just want it fast enough, so i can run it via localhost, and not take forever to load in the browser. Thank you... I plan mostly do php programming and perhaps coldfusion via this.

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• PHP unable to load dynamic library... but it is loaded. WTF?

  - by Josh

  I have a CentOS 5.4 server with Apache 2.2.3, mod_fastcgi and PHP 5.2.11. Everything is working great, server is a production server and I've had no complaints. When I was looking in PHP's error log to diagnose a problem with a specific page, I saw the following periodically repeated over and over: [03-May-2010 19:54:12] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/apc.so' - /usr/lib/php/modules/apc.so: undefined symbol: php_rfc1867_callback in Unknown on line 0 [03-May-2010 19:54:12] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/pdo_mysql.so' - /usr/lib/php/modules/pdo_mysql.so: undefined symbol: php_pdo_get_dbh_ce in Unknown on line 0 [03-May-2010 19:54:12] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/apc.so' - /usr/lib/php/modules/apc.so: undefined symbol: php_rfc1867_callback in Unknown on line 0 [03-May-2010 19:54:12] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/pdo_mysql.so' - /usr/lib/php/modules/pdo_mysql.so: undefined symbol: php_pdo_get_dbh_ce in Unknown on line 0 I am very confused because APC is loaded, I can see it in the output of phpinfo(). And by the look of these error messages nothing should be working at all. Yet sites seem to be running fine. How can I track down the source of this error?

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• Node.js, Nginx and Varnish with WebSockets

  - by Joe S

  I'm in the process of architecting the backend of a new Node.js web app that i'd like to be pretty scalable, but not overkill. In all of my previous Node.js deployments, I have used Nginx to serve static assets such as JS/CSS and reverse proxy to Node (As i've heard Nginx does a much better job of this / express is not really production ready). However, Nginx does not support WebSockets. I am making extensive use of Socket.IO for the first time and discovered many articles detailing this limitation. Most of them suggest using Varnish to direct the WebSockets traffic directly to node, bypassing Nginx. This is my current setup: Varnish : Port 80 - Routing HTTP requests to Nginx and WebSockets directly to node Nginx : Port 8080 - Serving Static Assets like CSS/JS Node.js Express: Port 3000 - Serving the App, over HTTP + WebSockets However, there is now the added complexity that Varnish doesn't support HTTPS, which requires Stunnel or some other solution, it's also not load balanced yet (Perhaps i will use HAProxy or something). The complexity is stacking up! I would like to keep things simpler than this if possible. Is it still necessary to reverse proxy Node.js using Nginx when Varnish is also present? As even if express is slow at serving static files, they should theoretically be cached by Varnish. Or are there better ways to implement this?

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• How to setup a virtual host in Ubuntu?

  - by Rade

  I have an app that's accessible via 1.2.3.4/myapp. The app is installed in /var/www/myapp. I've set up a subdomain(apps.mydomain.com) that points to 1.2.3.4. I want the server to point to var/www/myapp if I type apps.mydomain.com/myapp, how do I do that? I have experience creating virtual hosts(lots of them) locally but I'm lost because it's now in production and it's a little different. Here's my virtual host config: <VirtualHost *:80> ServerAdmin webmaster@localhost ServerName apps.mydomain.com/myapp DocumentRoot /var/www/myapp/public <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 ${APACHE_LOG_DIR}/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog ${APACHE_LOG_DIR}/access.log combined </VirtualHost> Any idea why I still see the files instead of pointing me to the document root? Just in case someone might ask, the app is based on Laravel 4 framework. It's really bad right now because anyone can access the files from the browser.

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• How can I set up a 404 error page when people access http://ftp.mydomain.com?

  - by Tim B.

  I am a freelance videographer/developer, and part of my job involves transferring large files over FTP to production houses/television stations. While the majority of people in my industry understand the difference between FTP and HTTP, I've experienced several interactions in the past couple months of people who still open Internet Explorer and try to access http://ftp.mydomain.com, receive an error page served by HostGator, and tell me that they cannot access my FTP server. Instead of spending time delivering instructions via e-mail, I'd much prefer to serve up a custom error page in this instance that instructs them how to download and use an FTP client. I tried setting up a sub-domain in Cpanel hoping I could simply drop in an .htaccess file with the error page, but I got this error: ftp.mydomain.com domainadmin-domainexistsglobal I also tried creating a custom error page in PHP which reads the site URL and serves up the custom content only when http://ftp.mydomain.com is accessed. Unfortunately, the error page works for every subdomain except that one. I'm not entirely sure this is even technically possible, which is why I bring it to the good people of StackOverflow to help. Thanks!

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• Performance of Virtual machines on very low end machines

  - by TheLQ

  I am managing a few cheap servers as my user base isn't large enough to get much more powerful servers. I also don't have the money lying around to invest in a server to prepare for the larger user base. So I'm stuck with the old hardware I have. I am toying with the idea of virtualizing all the current OS's with most likely VMware vSphere Hypervisor (AKA ESXi) Xen (ESXi has too strict of an HCL, and my hardware is too old). Big reasons for doing so: Ability to upgrade and scale hardware rapidly - This is most likely what I'll be doing as I distribute services, get a bigger server, centralize (electricity bills are horrible), distribute, get a bigger server, etc... Manually doing this by reinstalling the entire OS would be a big pain Safety from me - I've made many rookie mistakes, like doing lots of risky work on a vital production server. With a VM I can just backup the state, work on my machine, test, and revert if necessary. No worries, and no OS reinstallation Safety from other factors - As I scale servers might go down, and a backup VM can instantly be started. Various other reasons. However the limiting factor here is hardware. And I mean very depressing hardware. The current server's run off of a Pentium 3 and 4, and have 512 MB and 768 MB RAM respectively (RAM can be upgraded soon however). Is the Virtualization layer small enough to run itself and a Linux OS effectively? Will performance be acceptable (50% CPU overhead for every operation isn't acceptable)? Does it leave enough RAM for the Linux OS? Is this even feasible?

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• SQL Server 2008 Remote Access

  - by Timothy Strimple

  I'm having problems connecting to my SQL Server 2008 database from my computer. I have enabled remote connections as described in this answer (http://serverfault.com/questions/7798/how-to-enable-remote-connections-for-sql-server-2008). And I have added the ports listed on the microsoft support page to our Cisco Asa firewall and I'm still unable to connect. The error I'm getting from the SQL Management Studio is: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.) (Microsoft SQL Server, Error: 10060) Once again, I have double and triple checked that remote connections are enabled under the database properties and that TCP is enabled on the configuration page. I've added tcp ports 135, 1433, 1434, 2382, 2383, and 4022 as well as udp 1434 to the firewall. I've also checked to make sure that 1433 is the static port that is set in the tcp section of the database server configuration. The ports should be configured correctly in the firewall since http/https and rdp are all working and the sql server ports are setup the same way. What am I missing here? Any help you could offer would be greatly appreciated. Edit: I can connect to the server via TCP on the internal network. The servers are colocated in a datacenter and I can connect from my production box to my development box and vice versa. To me that indicates a firewall issue, but I've no idea what else to open. I've even tried allowing all tcp ports to that server without success.

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• Migrating to Amazon AWS etc: What key statistics/questions should be analyzed and asked?

  - by cerd

  I searched SOverflow pretty extensively for something similar to this set of questions. BACKGROUND: We are a growing 'big(ish)' data chemical data company that are outgrowing our lab and our dedicated production workhorses. Make no mistake, we need to do some serious query optimization. Our data (It comes from a certain govt. agency so the schema and lack of indexing is atrocious). So yes, I know, AWS or EC2 is not a silver bullet in the face of spending time to maybe rework your queries/code entirely 'out of the box'. With that said I would appreciate any input on the following questions: We produce on CentOS and lab on Ubuntu LTS which I prefer especially with their growing cloud / AWS integration. If we are mysql centric, and our biggest problem is these big cartesian products that produce slow queries, should we roll out what we know after more optimization with respect to Ubuntu/mySQL with the added Amazon horsepower? Or is there some merit to the NoSQL and other technologies they offer? What are the key metrics I need to gather from apache and mysql other than like: Disk I/O operations, Data up/down avgs and trends and special high usage periods/scenarios? I've reviewed AWS/EC2 fine print, but want 2nd opinions. What other services aside from the basic web/database have proven valuable to you? I know nothing of Hadoop or many other technologies they offer, echoing my prev. question, do you sometimes find it worth it (Initially having it be a gamble aside from basic homework) to dive/break into a whole new environment and try to/or end up finding a way of more efficiently producing your data/site product? Anything I should watch out for in projecting costs, or any other general advice when working with AWS folks from anyone else where your company is very niche and very very technical (Scientifically - or anybody for that matter)? Thanks very much for your input - I think this thread could be valuable to others as well.

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