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• Has ec2 made self-hosting possible for 'amateur' sysadmins possible?

  - by Blankman

  I'm a developer, and it seems ec2 has made it possible for a amateur sysadmin like me to setup and maintain a fairly large set of servers. Now I don't mean to undermine real sys admins, as I know the value of them but what I am trying to get at is that someone like me can setup and maintain a cluster of servers (front end web servers, with some db servers) using tools like ec2 and capistrano with the help of google. Now this isn't something I would do as a long term thing, but as a startup, one-man operation, I think I can pull this off until business takes off and I can hire this important role out. With ec2, I get my firewall, so I basically open up port 80 on my public facing server, which will run haproxy and route requests to my cluster of servers. Ofcourse I am simplifying the setup, but just want a feel for what you guys think about my perception. My application is a web application, that will be runing Ruby on rails (passenger) and talking to mysql or postgresql.

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• Best practice for ONLY allowing MySQL access to a server?

  - by Calvin Froedge

  Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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• A software to lock regions of a screen to prevent any windows from overlapping

  - by cybervaldez

  I've just installed nexus dock (a similar application like rocketdock), after playing with the preferences i've come across a very curious option (under position & behavior) that says: Prevent maximized windows from overlapping the dock. With it enabled, any application I maximize(and i do mean any) won't overlap the dock, it's really great. So i'm thinking perhaps there's a software that does this kind of feature which is really ideal for keeping my workspace really organized. I really hate repositioning and resizing my windows everytime. Of course there's always the manual way of doing these but it's just too much of a bother when someone from the family uses the computer. Do you know any software that does this? even a software that can just save/remember window positions would also be nice too.

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• Downloading content greater than 2000 bytes from local network hangs in browser on Windows XP

  - by artplastika

  We have web application that runs under Tomcat in a local network. Our customers experience strange problem using this web application. Let's say Tomcat server runs on host1 and we open webapp URL in browser on host2. Any browser on host 2 starts opening page and downloading of content "hangs" for hours. We've made bunch of experiments and found that any content larger than 2000 bytes makes browser request hang. Tried in Internet Explorer 8, Opera 12, Firefox. At the same time if user opens website from internet, it works. Opening webapp from the same host1 where Tomcat is running works normally. Local network is organized with D-Link DGS-3120-48TC switch. Additional info. During experiments we've noticed XP Tweaker installed on hosts. Network settings from that tool: MTU is manually set to 1500 RWIN = 14600 Support of TCP frames larger than 64 KB is on Time to Live = 32 SACK is on

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• One vs. many domain user accounts in a server farm

  - by mjustin

  We are in a migration process of a group of related computers (Intranet servers, SQL, application servers of one application) to a new domain. In the past we used one domain user account for every computer (web1, web2, appserver1, appserver2, sql1, sqlbackup ...) to access central Windows resources like network shares. Every computer also has a local user account with the same name. I am not sure if this is necessary, or if it would be easier to configure and maintain to use one domain user account. Are there key advantages / disadvantages of having one single user account vs. dedicated accounts per computer for this group of background servers? If I am not wrong, one advantage besides easier administration of the user account could be that moving installed applications and services around between the computers does not require a check of the access rights anymore. (Except where IP addresses or ports are used)

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• Restrict Applications access to Device

  - by Dboy1612

  I have a PC that has the ability to handle running multiple game clients at once (specifically Tera Online). What I'd like to do is assign and/or restrict each clients access to a device (Gamepad) so that the actions from each device only effects the client I specify. After doing some research with Python's PyGame, I can see that a Gamepad essentially works like a Keyboard does by sending global key events to the entire system, and then the application reading those events. Question is, how can I make it not global? ONly have one application read one controller? Any help is appreciated!

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• How to connect 2 virtual hosts running on the same machine?

  - by Gabrielle

  I have 2 virtual hosts running on my Windows XP laptop. One is Ubuntu running inside vmware player. The other is MS virtual PC (so I can test with IE6 ). The Ubuntu virtual host is running my web application with apache. I can point my browser on my laptop at the Ubuntu IP and view my web app. I read this post http://stackoverflow.com/questions/197792/how-to-connect-to-host-machine-from-within-virtual-pc-image and was able to get my Virtual PC to ping my physical machine using the loopback adapter. But I'm stuck on getting my Virtual PC to see my web application running in the Ubuntu vmware player host. I appreciate any suggestions.

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• Is there Firefox addon to identify performance problems in web applications ?

  - by Wahid Bitar

  I want a Firefox add-on to know where time is being spent in my Web Application.

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• I need some MySQL lookup table advice

  - by Gary Beam

  I have a MySQL database with about 200 tables. 50 of these are small 2-field 'id-data' lookup tables. Several of these DB's are hosted on a shared server. I have been informed that I need to reduce the total number of tables in the shared hosting environment because of performance issues relating to too many tables. My question is: Could/Should the 50 2-Field lookup tables be combined into a single 3-field table with 'id-field_name-data' Fields? Even if this can be done, I will have a lot of work to do on the PHP user application. My other choice is moving the DB's to a dedicated server at much higher hosting cost. I don't believe my 200 table DB's are actually causing any performance issues on this shared hosting server, at least not from the user application standpoint. There are never more than 10 of these tables joined in any single query; although I have seen some very-slow queries generated by phpmyadmin on these DB's.

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• LDAP + NFS + automount home directories permissions issue

  - by noobishguy

  When an LDAP user logs into the system they have incorrect permissions to their home directory. LDAP and NFS services exist on the same server. The directory shows the correct ownership / permissions: drwx------. 4 ldaptest ldaptest 4096 Jun 9 2014 ldaptest however the UID / GID do not match those on the server client: bash-4.1$ id uid=10001(ldaptest) gid=10001(ldaptest) groups=10001(ldaptest) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 server: [root@ldap1 log]# id ldaptest uid=502(ldaptest) gid=502(ldaptest) groups=502(ldaptest) How do I resolve this?

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• High CPU usage - symptoms moving from server to server after bouncing

  - by grt3kl

  First off, I apologize if I didn't include enough information to properly troubleshoot this issue. This sort of thing isn't my specialty, so it is a learning process. If there's something I need to provide, please let me know and I'll be happy to do what I can. The images associated with my question are at the bottom of this post. We are dealing with a clustered environment of four WebLogic 9.2 Java application servers. The cluster utilizes a round-robin load algorithm. Other details include: Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04) BEA JRockit(R) (build R27.4.0-90_CR352234-91983-1.5.0_12-20071115-1605-linux-x86_64, compiled mode) Basically, I started looking at the servers' performance because our customers are seeing lots of lag at various times of the day. Our servers should easily handle the loads they are given, so it's not clear what's going on. Using HP Performance Manager, I generated some graphs that indicate that the CPU usage is completely out of whack. It seems that, at any given point, one or more of the servers has a CPU utilization of over 50%. I know this isn't particularly high, but I would say it is a red flag based on the CPU utilization of the other servers in the WebLogic cluster. Interesting things to note: The high CPU utilization was occurring only on server02 for several weeks. The server crashed (extremely rare; we are not sure if it's related to this) and upon starting it back up, the CPU utilization was normal on all 4 servers. We restarted all 4 managed servers and the application server (on server01) yesterday, on 2/28. As you can see, server03 and server04 picked up the behavior that was seen on server02 before. The CPU utilization is a Java process owned by the application user (appown). The number of transactions is consistent across all servers. It doesn't seem like any one server is actually handling more than another. If anyone has any ideas or can at least point me in the right direction, that would be great. Again, please let me know if there is any additional information I should post. Thanks!

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• PHP 5 will not work in Centos 6 for me

  - by LaserBeak

  Just created a new install of Centos 6.0 64-bit on a virtual machine and running on Vmware workstation 8, windows host. yum install php service httpd restart And when trying to run a html file from the var\www\html dir which just has <?php phpinfo(); ?> in it or pointing browser to localhost. Nothing comes up. Also opened up httpd.conf and added: AddType application/x-httpd-php .php AddType application/x-httpd-php-source .phps Tried reinstalling, installing php-common, then php etc. to no avail. Otherwise going for the typical LAMP. installed: php.x86_64 5.3.2-6.el6_0.1 @updates php-cli.x86_64 5.3.2-6.el6_0.1 @updates php-common.x86_64 5.3.2-6.el6_0.1 @updates Yet to update to Centos 6.1 PHP5 is probably comes installed by default with Centos and I maybe stuffed it up by running yum install php?

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• List and kill running processes on Mac OS in Ctrl/Alt/Delete-like way?

  - by AP257

  So, what do you do on a Mac when a process (as opposed to an application) is hogging CPU, swamping your machine, and you need to kill it? I know you can use top or open Applications > Utilities > Activity Monitor and kill it from there. But what happens when the process is already using so much CPU that doing either of those tasks is impossible? On Windows, you can just do Ctrl/Alt/Delete and the process list will reliably open. So no matter how much your computer is thrashing, you always have access to the list of processes. On Mac OS, there's Cmd/Alt/Escape, which reliably shows running applications. Fine when it's an application causing the problem. But: what do you do if it's a process?

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• Setting up apache rewrite rule to only forward if in a directory

  - by wooowoopo

  Hi, I currently have a site setup with the following in httpd.conf: <VirtualHost x.x.x.x:80> ServerName testsite ExpiresActive On ExpiresByType image/gif A2592000 ExpiresByType image/png A2592000 ExpiresByType image/jpg A2592000 ExpiresByType image/jpeg A2592000 ExpiresByType text/css A2592000 ExpiresByType application/x-javascript A1 ExpiresByType text/javascript A1 AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css application/x-javascript text/javascript DocumentRoot /usr/local/www/apache22/data/thesite/trunk RewriteEngine On RewriteRule !\.(htc|js|tiff|gif|css|jpg|png|swf|ico|jar|html|doc|pdf|htm|xml)$ %{DOCUMENT_ROOT}/../platform.php [L] </VirtualHost> Where x.x.x.x is my IP. At the moment it forwards anything which is not in the set (htc|js|tiff|gif|css|jpg|png|swf|ico|jar|html|doc|pdf|htm|xml) to platform.php How htp://x.x.x.x/phpmyadmin to also forward. Would it be possible to only perform this rewrite conidtion if I am in a subdirectory. Eg. http://x.x.x.x/projectone So htp://x.x.x.x/projectone/login would direct to the platform.php Thanks

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• Simple HTTP server that will send the same file for all requests?

  - by Rory McCann

  I need to debug a XML-RPC application, which sends XML replies over HTTP. I have a sample XML reply (i.e. data from the server, sent to the client that isn't working), I'd like to debug my application. Ideally I'd like a simple HTTP server that will serve one file in reply to all requests. Someone requests /? Send them this file. Someone makes a post to /server/page.php with a certain cookie? Just send them this file. I don't care about multithreading, or security. I will only need to use this for a few hours to debug. I have root on the machine. i.e. I'm hoping there's something as easy to use as this: simple_http_server -p 12445 -f my_test_file I'm aware of python's SimpleHTTPServer module, but I'm not sure how to make it work in this case.

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• Dos-based printing from NT to unix/linux.

  - by SHW

  I need help for the below mentioned scenario: A Dot-matrix printer is physically connected to the Linux machine ( e.g. Ubuntu-10.04 , it can be any unix/linux flavour) From this linux machine, when I take a RDP to the Windows NT-4.0 TS, I run the DOS-based application. Now I want to print few pages from this DOS-based application to the Ubuntu's printer, When I am in RDP-Session. When I followed the samba-printing documentation, I am able to print from GUI-based apps like Notepad, MS WORD and so forth; but not able to print from the command prompt of Windows. Any idea how to do this ? [ WINDOWS MACHINE IS STRICTLY NT-4.0 2000 TS ]

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• I need to somehow change my ip address

  - by tric

  hello. i`m in a lan using iptables/masquerade. what i want to do, is to login in a web application.i write my user and passwd and click login and everything is fine, but if i try to modify something in that aplication it tells me that i have a wrong ip address.i knwo for sure that this app only allows ip 10.3.x.x .how can i trick that application to think that i have an ip from class 10.3.x.x and not my wan ip? 10x sorry for my bad english!

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• Created .htaccess file in /var/www to redirect to folder /var/www/foo

  - by Serg

  Context: How can I configure a NameCheap domain to point to an Apache subfolder? Following Devin's answer here I've created a .htaccess file in /var/www and wrote in the following: RewriteEngine On RewriteCond !sergiotapia.me RewriteRule (.*) sergiotapia.me/$1 [QSA] My folder structure is such: /var/www/ /var/www/sergiotapia.me When visiting the URL sergiotapia.me I see the contents of /var/www when I would like to be directly redirected to /var/www/sergiotapia.me Any ideas?

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• How to protect Ruby on Rails code on external server?

  - by Phil Byobu

  I have to deploy a Ruby on Rails Applications on a client's server and I do not want them to be able to view or modify the source code. How would you protect the code technically? I thought about building a linux-based virtual machine with an encrypted filesystem where the application code resides. The client has no root access, or direct access to the system at all. All services start automatically and the application is ready to use. What would you suggest?

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• Installing and configuring Zend Framework 2 server-wide [Ubuntu] and test driving ZendSkeletonApplication

  - by kinologik

  I'm trying to have ZF2 installed for all my subdomains at once (Ubuntu 12.04). ZF2 just launched its first stable version, so I wanted to install it on my development server and finally get my hands dirty with it. I downloaded ZF2 and unzipped the files in /var/ZF2/ (which now contains Zend/[all components]). I then edited /etc/php5/apache2/php.ini and added the path to the ZF2 files: include_path = ".:/var/ZF2" I then downloaded the ZendSkeletonApplication and unzipped it in /var/www/skeleton. I know it is suggested to composer.phar to install ZF2 application, but: I don't want to make a local installation of ZF2... I want to make a server-wide installation be able to use my Zend components on all my domains/subdomains on my development server. Before using any automatic installation process, I'd really like to understand that process by doing it manually at first. Obviously, something goes wrong when I fire ZendSkeletonApplication, and I get the following when hit the following URL: http://www.myDevServer.com/skeleton/public/ Fatal error: Uncaught exception 'RuntimeException' with message 'Unable to load ZF2. Run `php composer.phar install` or define a ZF2_PATH environment variable.' in /var/www/skeleton/init_autoloader.php:48 Stack trace: #0 /var/www/skeleton/public/index.php(9): include() #1 {main} thrown in /var/www/skeleton/init_autoloader.php on line 48 I have skimmed through the docs, tutorials and the like, but there are no straight forward answer to this kind of configuration. In the official doc, in the (very short) installation chapter, I see a reference to adding an include path in PHP. But no example... http://zf2.readthedocs.org/en/latest/ref/installation.html Once you have a copy of Zend Framework available, your application needs to be able to access the framework classes found in the library folder. Though there are several ways to achieve this, your PHP include_path needs to contain the path to Zend Framework’s library. But then, when I get to the "Getting Started" chapter, it's all composer.phar and nothing else... http://zf2.readthedocs.org/en/latest/user-guide/skeleton-application.html I'm no sysAdmin, just a Zend enthusiast. I'm pretty sure this PEBKAC problem might be obvious for those who already got in ZF2 previous betas. Thanks for helping my out. EDIT: Problem was resolved, thanks to Daniel M. Just setting up ZF2_PATH in httpd.conf was all that was needed. SetEnv ZF2_PATH /var/ZF2 I also removed the include_path reference in php.ini and everything works just fine. So I have no idea why Zend suggested to include it there in their official docs.

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• Passenger 'premature end of script headers' error

  - by fatnic

  Hi. I really need help debugging an error I'm getting with Passenger on Apache. I've just made a fresh install of Ubuntu 10.4 and have Apache, Ruby and Passenger installed. I'm trying to run a simple rack app but keep getting this error in my Apache error.log [Tue Sep 28 05:54:41 2010] [error] [client 86.171.2.82] Premature end of script headers: The error then continues with The backend application (process 25574) did not send a valid HTTP response; instead, it sent nothing at all. It is possible that it has crashed; please check whether there are crashing bugs in this application. *** Exception NoMethodError in PhusionPassenger::Rack::ApplicationSpawner (undefined method `call' for nil:NilClass) (process 25574): I've tried older versions of passenger also but get the same error. Ubuntu 10.4 Apache 2.2.14 Ruby 1.9.2-p0 Passenger 2.2.15

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• Stop a Windows XP taskbar item from blinking forever

  - by EMP

  In Windows XP when an application that doesn't currently have the focus wants to attract the user's attention its Taskbar item blinks. Often it blinks 3 times and then stops, which is fine. However, sometimes it just keeps blinking forever. An example of that is Firefox with a new JavaScript confirmation dialog. This is really annoying if I don't want to switch to that application just now - I basically cannot focus on anything else because of this stupid blinking thing distracting me! How do I force all apps to blink only 3 times (or X times) and then stop?

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• Strange behavior from Firefox and Paypal Plugin

  - by Fake Name

  Ok, so I use the paypal plugin with firefox, which is really nice because you can generate single use credit-cards on the fly. However, recently it's been acting strange. Normally, when you use the plugin, a drop-down window open in firefox. However, at some point (I'm not sure exactly when it happened, because I thought it wasn't working for a while) the drop-down window started appearing in thunderbird. As in, I click on the plugin button in firefox, and the plugin window immediately opens in Thunderbird. If Thunderbird is closed, the plugin does not open at all. I can use it normally this way (everything works except the receipt-saving function). but the whole affair seems a little odd to me. Is there any reason that could cause things to be redirected from one mozilla-application-window to another mozilla-application-window? Everything is up to date: Firefox 3.6.3 Thunderbird 3.0.5 Paypal Plugin 2.2.26.0

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• Is it possible to detect that a database connection is to a copy rather than to the original database?

  - by user149238

  I have an application that needs to know if it is connected to the original database that it was installed with or if the connection is to a copy of that database. Is there any known method to know if the database has been cloned and the application is no longer connected to the original? I am specifically interested in MS SQL Server and Oracle. I was kicking ideas around for a stored procedure but that most likely doesn't have access to the hardware to confirm unique hardware information that would somewhat guarantee that the database is the one that it was originally connected to during installation. I'm trying to prevent/detect cloning of a database so that there is only 1 "true location of truth". Thanks!

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• SSD Performance for PHP?

  - by Andrew Fashion

  My programmer just built an application with PHP using Doctrine ORM (will be a high traffic social networking website), and it's very heavy in PHP/Apache and CPU. The queries are wonderfully fast, and MySQL is barely using any CPU, it's just Apache. I was curious to if an SSD would help speed up PHP/Apache, because I know the bottleneck is in PHP reading multiple files, class files, and loading up a bunch of data. So common sense makes me think if PHP is reading multiple PHP files, an SSD would only help as far as read/write? I was thinking of doing a high performance SSD for the PHP application, but for user image uploads, I would just continue using a 15k SAS. Is there any performance issues regarding using an SSD in this kind of situation? And would it prove to help speed up PHP/Apache, and help the CPU problem out?

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