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  • How does virtualization improve server utilization?

    - by Continuation
    The biggest benefit of virtualization is usually said to be improved server utilization. But why do I need virtualization for that? Say I got N physical servers that are lightly used. Why don't I just combine all the apps on those N servers into 1 physical server? This way I don't incur the performance penalty of virtualization. What does virtualization buy me in this case?

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  • Zensyslog Clear Events

    - by Stefan Mai
    I've hooked up Zenoss' Zensyslog so that messages from a distributed list of client machines are all conglomerated into events on the Zenoss server. This is all fantastic, and I can bump messages by simply using the logger command: logger -t webserver_is_down "The web server is down" What I'd like to be able to do is also post an event that clears for when the webserver comes up. logger -t webserver_is_up "The web server is up" I've tried to set this up with Event classes but with no dice. Is there a Syslog level that correlates with Zenoss' clear/0 level? Is there another easy way to do this? Thanks for any help you can give!

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  • Rails Hosting - Is RailsPlayground.com a Good Host?

    - by stringo0
    My team is currently looking into hosting for RoR apps, and we're considering RailsPlayground, Linode and SliceHost. We haven't found anyone recommending rails playground, and web of trust seems to caution against it - http://www.mywot.com/en/scorecard/railsplayground.com I like the fact that they give you a sourcerepo account for free to host and track git repos, etc. The Questions: Is there any reason not to go with RailsPlayground? Have you had any negative experiences with RailsPlayground? (Feel free to share positives as well) Thanks!

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  • Jumplists; Frequent and Recent parts always out of date

    - by Arman
    I really tried to figure this problem out, but my "Recent 5" and "All" Playlists of Win7's WMP12 never contain anything. Also I have the "frequent" part of all the apps' jumplists filled with rarely-used or one-time-used options, also "recent" parts are rarely up-to-date and many recent files I've used are not mentioned in the jumplist's "recent" part.

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  • Recommendation for a touch-enabled dev laptop

    - by Clay Shannon
    I don't keep up with hardware much, so would appreciate any tips on what would be a good touch-enabled laptop that I could use for both development and testing of Windows 8 ("Metro"/Store) apps. Is there even such an animal (a touch-centric laptop)? Or will I need to use a laptop for development (in which case I might be able to upgrade my RC version of Windows 8 on my existing laptop to RTM) and purchase a tablet for testing?

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  • Likeliness of obtaining same IP address after restarting a router

    - by ?affael
    My actual objective is to simulate logged IPs of web-site users who are all assumed to use dynamically assigned IPs. There will be two kinds of users: good users who only change IP when the ISP assignes a new one bad users who will restart their router to obtain a new IP So what I would like to understand is what assignment mechanics are usually at work here deciding from what pool of IPs one is chosen and whether the probability is uniformly distributed. I know there is no definite and global answer as this process can be adjusted be the ISP but maybe there is something like a technological frame and common process that allows some plausible assumptions. UPDATE: A bad user will restart the router as often as possible if necessary. So here the central question is how many IP changes on average are necessary to end up with a previously used IP.

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  • Using mod_rewrite to hide tomcat port

    - by user123181
    I have apps on Tomcat that use URLs like this: http://xxx:8080/myapp I don't want the users to see the port in the URL. Hi can do a rewrite rule like this: RewriteRule ^/myapp(.*) http://xxx:8080/myapp$1 [P,L] This way, if a user goes to the URL http://xxx/myapp he can enter the app fine, but the port will still show up on the browser. I want the URL that the user sees to be always http://xxx/myapp How can I do this using mod_rewrite?

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  • how to install a program for all users on Windows 8?

    - by Bobb
    when I install stuff under built-in Administrator - the other users cannot see the changes. for example I changed VS2012 install - added Blend and few other features - and they are invisible under another user - my 'Microsoft account' ... I surely don't want this kind of behavior. Can it be changed? EDIT: I want those apps 'legitimately installed' for all users so I can use Search and see them on my Start screen.

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  • Sandbox on a linux server for group members

    - by mgualt
    I am a member of a large group (academic department) using a central GNU/Linux server. I would like to be able to install web apps like instiki, run version control repositories, and serve content over the web. But the admins won't permit this due to security concerns. Is there a way for them to sandbox me, protecting their servers in case I am hacked? What is the standard solution for a problem like this?

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  • Microsoft Exchange mail features and AD question

    - by Daniel Fukuda
    Hello, I wanted to ask is there a feature that allows Microsoft Exchange to download emails through POP3 from another mail provider like Google Apps (Gmail for your own domain), then store it and allowing users to download (POP3/IMAP) emails to Outlook/Live Mail. So I want to Microsoft Exchange to become like middle mail provider. My another question is regarding Microsoft Server Active Directory, is Windows Server 2008 Active Directory working with Windows XP Professional and is there any new feature added to Win2k8 AD?

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  • Benefits of setting a webserver in Linux

    - by John Kent
    I wonder what main purposes and benefits can one get after he sets up a webserver running on Linux installed on a VM which is hosted by Windows and that this webserver can be used as a local host for windows ? That is, I have java application that is a webserver made on Linux, I set up the virtual machine for the windows client apps to listen to its (Linux)'s local IP address and port e.g 192.168.50.50:11111 When my webserver runs, I can use http://192.168.50.50/ as the windows's localhost address (instead of 127.0.0.1 as I usually do). Thank you

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  • Navicat Premium Essentials - Mac OS Maverick

    - by Alberto Schiariti
    Do anyone know why since Maverick update, Navicat can't connect anymore to any database which is saved into "/Users/Username" folder? It keeps saying: "Database file path is not correct". If I copy/paste the same DB in any other folder it connects perfectly. I need to open DBs in that folder because that's the folder where Xcode put the Apps ones and I can't everytime I need to modify them, copy/paste them on my desktop and then put them back again.

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  • How much power supply do I need for my server, and could a shortage be causing my odd crashing?

    - by dolan
    I have 5 servers, all with similar hardware (i7, four 2tb 7200rpm drives, two 4tb 5400rpm drives, 430 watt power supply), and lately the machines have been freezing up. This has gotten worse in the last day or so, and I can't pinpoint any explanation. One recent change was adding the two 4tb hard drives. The crashes happen most often while running a large Hadoop job, so I was originally thinking the load was causing some issues, but last night one server just froze without any heavy load on the box (or so I think), other than HDFS (Hadoop's distributed file system) was probably rebalancing itself since two of the five nodes were offline. If I plugin a monitor and keyboard to one of these frozen machines, I can't get any response or feedback on the screen. Any ideas on possible points of failure and/or different logs I can look at to investigate? Thanks Edit: The systems are running Ubuntu 10.04 Edit 2: More on hardware: intel core i7-930 bloomfield 2.8ghz processor (quad core) 12gb (6 x 2gb) kingston ddr3 1333 ram antec earthwatts green 430 power supply msi x58m lga 1366 motherboard

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  • Testing performance from around the world - how do I get a linux shell easily in multiple countries?

    - by Matthew O'Riordan
    We are building a socket based service where latency is paramount, and as such we have servers distributed into 7 data centres around the world. However, whilst we know we're bringing the servers closer to the clients, it's very difficult to know how effective this is, and importantly, what difference this makes compared to our competitors. As such, we want to run simple scripts that test latency and throughput for both our service and our competitors, which is easy enough using Amazon, however Amazon only have 7 data centres. We would like to know for example how we perform in locations all over the world such as South Africa, Australia, China, Peru etc. Does anyone know of any service where we could piggy back off their global infrastructure and run some scripts to test this performance? The obvious contenders are people like Monitis, but I don't think they would allow us to run custom scripts, only standard protocol monitors. Thanks for your help. Matt

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  • Can Robocopy be made to skip open files?

    - by domspurling
    We are using Robocopy to redistribute files which arrive via FTP in a drop folder. Ideally we want Robocopy to leave files alone if they are still being FTPd. Having tried various switches, Robocopy still copies the open files. It doesn't delete them, so the FTP continues unaffected. However, we end up with truncated files being distributed to their destination. Can Robocopy be made to skip open files? Perhaps there is something more suitable than Robocopy for this task?

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  • create a bootable usb to automatic repair windows xp system32 files

    - by Edo Post
    Is it possible to create a script/live distro that replaces some system32 files? To explain it a bit more in details: There is a company that has multiple computers (think in 100/1000's) and they all are missing the same system32 files since the company's software removed it. The systems are distributed all over the world and are managed by "normal" people who don't have any knowledge about computers. I want to create a usb stick that i can mail to all those people which contains a script that executes when you boot the usb. this script should replace the missing system32 files without any user input is this possible, and if so how could i manage this?

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  • Video codec that can be read on clean installs of either Windows, OS X and Ubuntu

    - by fmercille
    I have to make a video that will need to be watched on different operating systems. Is there a "universal" video codec that can be played on Windows, OS X and Linux without requiring additional plugins or player other than those that comes on a default clean install of each of those systems? Compression is not an issue, I'm merely looking for compatibility (e.g. for audio, I would use WAV as a universal codec). Note : I must assume that the video will be distributed in countries where software patents are enforced, and therefore can't rely on the user to install non-free codecs on Linux. Thanks.

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  • Managing hosts and iptables in scalable architecture

    - by hakunin
    Let's say I have a load balancer in front of 3 app servers. Let's say I also have these services available at certain IPs: Postgres server Redis server ElasticSearch server Memcached server 1 Memcached server 2 Memcached server 3 So that's 6 nodes at 6 different IP addresses. Naturally, every one of my 3 app servers needs to talk to these 6 servers above. Then, to make it a bit funkier, I also have 3 worker servers. And each worker also talks to the above 6 servers, but thankfully workers and apps never need to talk to each other. Now's the kicker. Everything is on Digital Ocean VPS. What that means is: you have no private network, no private IPs. You only have separate, random IP address on each machine. You can't mask them or anything. So in order to build a secure environment I would have to configure some iptables. For example: Open app servers be accessed by load balancer server Open redis, ES, PG, and each memcached servers to be accessed by each app's IP and each worker's IP This means that every time I add an app or worker I have to also reconfigure iptables in those above 6 servers to welcome the new app or worker. Is there a way to simplify this type of setup? I was thinking — what if there was a gateway machine between apps/workers and the above 6 machines. This way all the interaction would always happen via the gateway server, and when I add a new app or worker I wouldn't need to teach the 6 servers to let it in. If I went this route, then I'd hope a small 512mb server could handle that perhaps, and there wouldn't be almost any overhead. Or would there? Please help with best way to handle this situation. I would appreciate an answer as concrete as possible. I don't think this is too specific, because this general architecture is very common, and Digital Ocean is becoming increasingly popular. A concrete solution here would be much appreciated by many.

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