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• Malware vs Viruses

  - by Kyle Brandt

  Is there a legitimate technical difference between malware and viruses? I have looked at the Wikipedia entries but I am not really seeing the difference. Currently, I kind of feel like this is just Symantec's way of getting more money for products (features). But maybe someone involved more deeply in this area can explain this.

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• Squid vs mod_proxy (apache)

  - by Fahim Akhter

  Hi, New to servers, been hovering on http://highscalability.com/ for some days. Most of the architectures there show that people are using squid for proxy. Apache also provided mod_proxy which to a noob eye seems pretty much the same. Is there a perticular reason to opt for squid instead of mod_proxy? Thanks

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• Centos repository packages vs latest developer release

  - by fran

  I have started to run a personal server using CentOS and I have noticed that many packages that are available to install from repository are old compared with the latest release from the developer. I know that installing packages from repository is very easy and I guess that the supplied versions are stable and prepared to work without any trouble, but I still find odd having so much software that lags behind the current version. It's my first time with linux and I don't know what is the "normal" thing, should I stick to whatever version the repository supplies, or try to get the latest from the developer? To be more precisely, the repository supplies the apache httpd web server with version 2.2, I wanted to update to 2.4, so I started removing apache and its dependencies packages that come with centos to use the latest ones, but when I was about to remove pcre v6 to replace it with v8, i found out that 132 installed packages depend on it and probably it is not a good idea to remove it, so that made me think twice about getting the latest software instead of using the packages supplied by the official repositories. Should I leave things as they are instead of going on an upgrade rampage? Thanks

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• Dns - wildcard vs. cname subdomains

  - by Matthew

  Alright I have to admit I'm confused with how DNS works. I've always just added things until they worked, and now it's time to learn how they work. So one confusing thing to me is that there's sort of two places I can have records. I have an account with rackspace cloud servers. And then there's the place I registered the domain. But both allow me to edit DNS records. Should I do everything at both places or is one better than the other or am I missing the point? Subdomains confuse me too. I'd like to be able to just have a wildcard subdomain (I've done this in the past.) I just don't like the idea of adding a cname record or A record every time I need a new subdomain. Then I read this and it says: The exact rules for when a wild card will match are specified in RFC 1034, but the rules are neither intuitive nor clearly specified. This has resulted in incompatible implementations and unexpected results when they are used.

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• Nagios remote monitoring: NRPE Vs. SSH

  - by sam

  We use Nagios to monitor quite a few (~130) servers. We monitor CPU, Disk, RAM and a few other things on each server. I've always used SSH to run the remote commands, purely because it requires little to no additional config on the remote server, just install nagios-plugins, create the nagios user and add the SSH key, all of which I've automated into a shell script. I've never actually considered the performance implications of using SSH over NRPE. I'm not too bothered about the load hit on the Nagios server (It's probably over-speced for what it does, it's never been over 10% CPU), but we run each remote check every 30 seconds and each server has 5 different checks performed. I assume SSH requires more resources for each check but is there a huge difference? (I.E. enough of a difference to warrant the switch to NRPE). If it's any help, we monitor a mix of physical servers (Normally with 8, 12 or 16 physical cores) and Amazon EC2 medium/large instances.

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• How to network a Mac running System 7.6 with Mac OS X 10.6 or Windows Vista over Ethernet?

  - by Brian Teeter

  The title pretty much says it all. I have a Powerbook 540c that is connected to my network via Ethernet. It has no Internet tools on it at all, and its running System 7.6. I am trying to figure out a way to get it to mount a drive on either my Windows Vista workstation or my Snow Leopard Macbook. Once I do that I can get an old browser on there and get what I need off the Internet. Thus far I have not been able to get it connected. Microsoft dropped Appletalk support in XP and despite enabling Appletalk on my Macbook, the powerbook cannot see it in the Chooser. Any ideas?

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• IT merger - self-sufficient site with domain controller VS thin clients outpost with access to termi

  - by imagodei

  SITUATION: A larger company acquires a smaller one. IT infrastructure has to be merged. There are no immediate plans to change the current size or role of the smaller company - the offices and production remain. It has a Win 2003 SBS domain server, Win 2000 file server, linux server for SVN and internal Wikipedia, 2 or 3 production machines, LTO backup solution. The servers are approx. 5 years old. Cisco network equippment (switches, wireless, ASA). Mail solution is a hosted Exchange. There are approx. 35 desktops and laptops in the company. IT infrastructure unification: There are 2 IT merging proposals. 1.) Replacing old servers, installing Win Server 2008 domain controller, and setting up either subdomain or domain trust to a larger company. File server and other servers remain local and synchronization should be set up to a centralized location in larger company. Similary with the backup - it remains local and if needed it should be replicated to a centralized location. Licensing is managed by smaller company. 2.) All servers are moved to a centralized location in larger company. As many desktop machines as possible are replaced by thin clients. The actual machines are virtualized and hosted by Terminal server at the same central location. Citrix solutions will be used. Only router and site-2-site VPN connection remain at the smaller company. Backup internet line to insure near 100% availability is needed. Licensing is mainly managed by larger company. Only specialized software for PCs that will not be virtualized is managed by smaller company. I'd like to ask you to discuss both solutions a bit. In your opinion, which is better from the operational point of view? Which is more reliable, cheaper in the long run? Easier to manage from the system administrator's point of view? Easier on the budget and easier to maintain from IT department's point of view? Does anybody have any experience with the second option and how does it perform in production environment? Pros and cons of both? Your input will be of great significance to me. Thank you very much!

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• Outdoor WiFi Mesh Topology vs. Repeaters

  - by IronJaxor

  Here's the current configuration in our organization (which I believe is incorrect): We have a number of Cisco 1500 series AP's (22 in total), that are mounted outdoors to provide seamless WiFi coverage over a large area. Each AP however has its own physical ethernet connection back to the WLC (All the AP's are marked as Root AP's). They are all broadcasting the same SSID. We have tried to stagger the channel selection but because there are only three non-overlapping channels to choose from, and in some areas the density of AP's is quite high, there is multiple places of channel interference. With this configuration we experience 100-150 disconnects from clients every day. (Our clients are mobile so they move throughout the coverage area constantly). My idea is to switch the AP's to the same channel thereby forming a wireless mesh, use the built in functionality of the 1500 series to use 802.11a as the backhaul, designate one or two AP's as root AP's and wire them back to the WLC. Thereby forming a WiFi mesh, which if I'm not mistaken is the point of the 1500 series in the first place! I am however completely new at WiFi networks and wondering if I am simply mistaken in what I believe my proposed changes will enable, or if there is a better way to tackle the WiFi topology.

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• Can't import pygame to Netbeans on Mac

  - by Hollgam

  I am running python 2.6.5 and pygame 1.9.1 It seems to me I've tried everything but it keeps showing 'module not found' errors... Please help!

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• Centos OS resource footprint vs Ubuntu package refresh

  - by webworm

  I am trying to determine which distro to sink my teeth into. I am new to the Linux world and would like to choose a distro to focus on. I have read that CentOS uses less resources than Ubuntu, which is an issue for me since I am renting a VPS and resource cost is an issue. I have also read that Ubuntu has more up-to-date packages which is a concern for me as I want to use PHP and some packages that have a fair amount of dependencies. I am not using Linux as a desktop OS, rather just as a server for Apache, PHP, PERL, and Java development. What would be the best choice for a server OS? CentOS or Ubuntu? Are the resource requirements that different? Are the packages that different between the two? Thanks.

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• Mobile Intel 965 vs 4 Series chipset speed differences

  - by graham.reeds

  A client of ours is having a problem panning on a mapping application that we write on their panasonic toughbooks (CF-19's). One of their toughbooks the panning is fairly smooth while on the other it is really slow. Doesn't help that they have all the settings turned up, but I would of thought any reasonably new graphics card (even shared memory) would have more than adequate graphic speed. I am pretty sure that the graphic adapter is to blame, but I can't find anything out about either chipset (level of acceleration, non-problems, etc). All I get is the intel data sheets. The faster panning one is on the Mobile Intel 4 Series Express Chipset while the slower is on the Mobile Intel 965 Express Chipset. Is this expected? Does it sound like a driver problem? They both have the same amount of ram and same cpu.

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• audio error in vmware running mac os x

  - by PenguinSource

  simple synchronous loading of an audio file (.mp3) in a cocos2d app makes my vmware disconnect the sound. the error is display bottom right, saying 'error in creating sound stream; sound is disconnected' i read that it might be cause of my vmware's version (mine is 8) but I'm looking for a fix, not to downgrade to another version. before i get that error, the sound on the system works just fine (youtube, etc) the exact code im calling is.. [CDSoundEngine setMixerSampleRate: CD_SAMPLE_RATE_MID]; [[CDAudioManager sharedManager] setResignBehavior: kAMRBStopPlay autoHandle:Yes]; soundEngine = [SimpleAudioEngine sharedEngine]; [soundEngine preloadBackgroundMusic:@"somemp3.mp3"]; [soundEngine playBackgroundMusic:@"somemp3.mp3"]; maybe the bit rate is too high .. ? thanks

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• How to benchmark kernel (-Os vs -O2)

  - by NightwishFan

  It seems logical to me that on a 64-bit kernel compiling it to optimize for size might help overall. (My distro of choice uses -O2) It has the benefits of more registers and memory and perhaps less cache contention than normal optimized code. I have a kernel compiled like this and it seems excellent. However my question is how can I prove this? I like using Phoronix for "real world" sort of benchmarks so I would prefer to test cases like that. What should I pick to test? Does anyone else have any alternatives? Thank you very much in advance.

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• Need help with jQuery/AJAX call in Safari/Mac

  - by protohominid

  I've got something that works perfectly in FF and MSIE but it's not working properly in Safari. It's a form with selects that get updated via AJAX/jQuery from a MySQL DB. In Safari, when you select the first item, it correctly loads the options for the next select menu; however, when you choose one of those (which loads new options in a subsequent select menu), the whole form resets and is broken from that point on. Does anyone know of a Safari bug that would cause this? Here's the JS: $(document).ready(function(){ $("#searchForm select").change(updateSearchForm); }); function updateSearchForm() { $.ajax({ url: '/elements/search_form.php?ajax=true', data: $('#searchForm').serialize(), error:function(xhr,err){ alert("readyState: "+xhr.readyState+"\nstatus: "+xhr.status); alert("responseText: "+xhr.responseText); }, success: function(data) { $("#searchForm").html(data); $("#searchForm select").change(updateSearchForm); } }); } I can post the relevant PHP/HTML for the form, but it's lengthy. I'm relatively new to JS so I'm not sure where to start debugging this... TIA

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• mac, java 1.5: javax.mail not recognized as a jar file

  - by Helpme

  hello fellow java developers, Having a little issue with creating a java application on a macintosh computer (snow leopard). I've set up my application in eclipse, added all of the appropriate jar files, but for some reason the code is not recognizing some of my variables as valid types. I've imported the libraries via import javax.mail.*; import javax.mail.internet.*; These libraries are not recognized by the application. BUT I've put them on the build path! Any advice on how to fix this?

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• Ubuntu 64-bit vs 32-bit

  - by tukushan

  Is it worth installing the Ubuntu 9.10 64-bit version over the 32-bit x86 version? I will get the ability to address more than 4 GB of memory, but other than that, how does the 64-bit version fare in terms of performance and stability?

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• Outputing UTF-8 string on Mac OS's Terminal

  - by SuperBloup

  I got a programm in haskell outputting utf-8 using the package utf8-string and using only the output functions of this package. I set the encoding of each file I write to this way : hSetEncoding myFile utf8 {- myFile may be stdout -} but when I try to output : alpha = [fromEnum 0x03B1] {- a -} instead of the nice alpha letter I got on Linux (or in a file on windows), I got the following : α The weird thing is even if I try to write the output on a file, I can't read it back with mvim as an utf-8 file. Is there any way to get the correct behaviour

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• Separate domains vs. one domain with alias-domains

  - by Quasdunk

  I have tried to ask this question a few days ago but I'm afraid it was not clear enough, so here's another try. I have set up a LAMP-server using ISPConfig 3 for the administration. PHP is running over Fast-CGI. I have several domains, like my_site.com, my_site.net and my_site.org, but they all point to the same application/website. Each domain has its own web-root-folder and is running under its own user. The application itself is in a common directory which is owned by another user, like so: # path to my_application (owned by web1) /var/www/clients/client1/web1/web/my_application/ # sym-link to my_application from my_site.com-web-root (owned by web5) /var/www/my_site.com/web -> /var/www/clients/client1/web1/web/ # sym-link to my_application from my_site.net (owned by web4) /var/www/my_site.net/web -> /var/www/clients/client1/web1/web/ With a setup like this I have encountered a few problems concerning the permissions when performing filesystem-operations with PHP. For instance, if the application is called via my_site.com, the user web5 is trying to write something to the application-folder. But the application-folder is owned by the user web1, so web5 is not allowed to write there. As far as I unterstand, this is how Fast-CGI works. After some research and asking a few people, the solution seems to be to break it all down to one domain (e.g. my_site.com) and define the other domains (my_site.org, my_site.net) as alias for this one domain. That way, there would be only one user who has all necessary permissions. However, this would mean that we'd have to buy a multidomain SSL-certificate - but we already have an SSL-certificate for each domain. We were able to use them with our previous provider (managed hosting), and there we also had only one web-directory and multiple domains. So if this was possible, I wonder: Is putting all the domains together into one v-host with one main- and several alias-domains the right approach in this case? Or may I have misunderstood something?

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• VS 2010 Crashes on a clean machine

  - by Jonathan Allen

  I just built a clean PC with WIndows 7 x64. And yet Visual Studio 2010 still crashes at random just on startup or when creating new projects. Is this affecting anyone else and do you know of any patches or work-arounds?

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• crontab won't work on mac 10.6.7

  - by ohana

  i create a simple cron job by editing /etc/crontab as following: */2 * * * * * php /Users/min/Documents/testcron.php and the testcron.php is simple as: <?php $fd = fopen("/Users/min/Documents/testcron.txt", 'a'); fwrite($fd, "test--cron--\n"); fclose($fd); ?> then simply save the crontab file and hope magic happen, but nothing happened. i even run the command manually and it worked. php /Users/min/Documents/testcron.php anyone have any idea? Thanks

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• Servers - Buying New vs Buying Second-hand

  - by Django Reinhardt

  We're currently in the process of adding additional servers to our website. We have a pretty simple topology planned: A Firewall/Router Server infront of a Web Application Server and Database Server. Here's a simple (and technically incorrect) diagram that I used in a previous question to illustrate what I mean: We're now wondering about the specs of our two new machines (the Web App and Firewall servers) and whether we can get away with buying a couple of old servers. (Note: Both machines will be running Windows Server 2008 R2.) We're not too concerned about our Firewall/Router server as we're pretty sure it won't be taxed too heavily, but we are interested in our Web App server. I realise that answering this type of question is really difficult without a ton of specifics on users, bandwidth, concurrent sessions, etc, etc., so I just want to focus on the general wisdom on buying old versus new. I had originally specced a new Dell PowerEdge R300 (1U Rack) for our company. In short, because we're going to be caching as much data as possible, I focussed on Processor Speed and Memory: Quad-Core Intel Xeon X3323 2.5Ghz (2x3M Cache) 1333Mhz FSB 16GB DDR2 667Mhz But when I was looking for a cheap second-hand machine for our Firewall/Router, I came across several machines that made our engineer ask a very reasonable question: If we stuck a boat load of RAM in this thing, wouldn't it do for the Web App Server and save us a ton of money in the process? For example, what about a second-hand machine with the following specs: 2x Dual-Core AMD Opteron 2218 2.6Ghz (2MB Cache) 1000Mhz HT 16GB DDR2 667Mhz Would it really be comparable with the more expensive (new) server above? Our engineer postulated that the reason companies upgrade their servers to newer processors is often because they want to reduce their power costs, and that a 2.6Ghz processor was still a 2.6Ghz processor, no matter when it was made. Benchmarks on various sites don't really support this theory, but I was wondering what server admin thought. Thanks for any advice.

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• LDAP authentication: Windows Server2k3 vs. 2k8

  - by wolfgangsz

  We have around 70% linux users, all of which are configured to authenticate against Active Directory through LDAP. In order for this to work, we used the "Windows Services for Unix" under Windows Server 2003, and it all works fine. We are now at a point where the server running this contraption is getting a bit tired and will be replaced with a newer machine, running Windows Server 2008 (where the relevant services such as user name mapping and password changes, etc., are integrated with the OS). And here's the rub: If a new user is configured through the Win2k3 server, then it all works fine. If the same thing is done through the Win2k8 server, then : The ADS plugin on the 2k3 server does not recognize it and behaves as if the UNIX attributes were never set. The user cannot authenticate against ADS using LDAP. Has anybody encountered this problem? If so, how did you overcome this? If you need any additional information to provide further help, just ask and I shall provide it.

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• How to add information to about screen of my cocoa app in Mac Os X

  - by Unicorn

  Hi All, I am pretty new in developing cocoa applications. I have developed a small UI application using cocoa. I wanted to add some information on about screen, currently it shows the app name and version which is 1.00. Can any one help me how i can add some information in about screen, is it possible to add information programmatically instead of hard coding it ? Any help will be appreciated.

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• Benefits of In-house server management vs outsourcing [closed]

  - by Eric Di Bari

  I've just created a small web-based company. We're planning on using a cloud hosting solution, but don't have the current resources to properly setup and manage the server. As a new company, are there more benefits to bringing someone on-board as part of the organization to manage the server, versus going with a third-party management company? Such as a greater degree of 'ownership' and involvement?

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• Mac OS - Download an save an image file on HDD with Cocoa

  - by Julien

  I'm building a program, and I'm quite confident using Objective-C, but I don't know how to programmatically download a file from the web and copy it on the hard drive. I started with : NSString url = @"http://spiritofpolo.com/images/logo.png"; NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]]; But then I don't know what to do with the data... that sucks, no ;) Can somebody help?

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