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  • Standalone server setup for compute capacity

    - by mikera
    I'm developing an application for my company that will require a lot of compute capacity (running some very big mathematical calculations), and looking for some form of server setup to do this. For various reasons, we want to run this on-site in our office rather than hosting it externally. It's been a while since I last had to set up my own servers so I thought I would tap into the collective wisdom of serverfault! My broad requirements are: Budget $30-50k, with an aim to get as much compute capacity as possible for that budget 64-bit servers suitable to run Ubuntu Linux + Java Some relatively standalone rack that can be installed in secure office space Fast/low latency network connections between the servers, but don't really care about connectivity to the outside world Storage capacity shared between the servers - they don't necessarily need their own storage providing they can be booted from a common image Downtime can be tolerated (since the calculations are run in batch mode) The software itself is fault-tolerant, so there is no need for extra resiliency in the server setup (cheap replaceable commodity parts will be fine in general) Given these requirements what kind of setup would you recommend and why?

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  • Enterprise Portal Issue with the Ax Demo VPCs

    - by ssmantha
    Microsoft’s Ax Demo VPC is basically configured for a static IP address 192.168.0.1, this is due to the fact that the VPC has Domain Controlller configured in it which requires a static IP. When we put this VPC on a network with a different subnet and change the IP you can observer that the site http://sharepoint and http://sharepoint/EP cease to function and show “Page Not Found” errors in the browser. This is mainly due to the DNS configuration which is not updated. Below is the screen shot of the changes that needs to be done to make the site functioning properly. Change the following entries in the Forward Lookup Zones of DNS management: These websites default, SharePoint and projectserver are all mapped to a single port in the IIS i.e. port number 80. These websites are recognised with host headers. These host headers are configured in DNS with incorrect IP address entries in DNS when you change the IP address of the VPC. Just change these values to point to the Local Loop Adapter (127.0.0.1) and change the DNS to point to this address in the TCP/IP properties as shown below: This will resolve the issue with the website rendering. Initially you may get time out errors while browsing these website. be patient and try again this would work.

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  • USB Device With Embedded Fileserver

    - by Richard Martinez
    I'm attempting to access logs from a proprietary hardware box with no reasonable hope of modifying the software. There is a process on the device to dump log files to a flash drive on the USB port after entering a code sequence. Currently, analysis of the logs requires the following: Physical presence at the device Manual entry of the code sequence Removal of USB device Insertion of USB device into a normal Linux box I'm hoping there is some sort of device that can act as a USB mass storage device but simultaneously make it's contents available as a network file share (wired preferred). Does such a device currently exist? A combo hardware/software solution would also work.

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  • Blogger Blog Takes Ages to Load after Custom Domain Redirection

    - by abhisek
    I recently bought a custom domain for a blogger blog (technabled.com) I have for sometime now. I followed the instructions on blogger's documentation. I added A-name records and CNAME records with my DNS provider. But, now, some strange problems are cropping up. If I connect to my broadband network and then ping technabled.com, it times out. Then, if I visit the webpage, which takes almost one and half minutes to load, and then if I ping technabled.com, it shows expected result. This is not just me. I asked some of the regular readers, who reported the same issue. As a result of this, I am losing a lot of visits. What is stranger is that the subsequent visits to the blog is faster. I have checked with a few online services to test the performance. WebPageTest seems to say the same thing: http://www.webpagetest.org/result/110117_1N_7PE/ (please see the First View / Repeat View time) Also, the pagespeed score is not that bad. So I am ruling out other possibilities. I am at a loss as to what I should do to find a solution. Help is much appreciated. :)

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  • Configure iptables with a bridge and static IPs

    - by Andrew Koester
    I have my server set up with several public IP addresses, with a network configuration as follows (with example IPs): eth0 \- br0 - 1.1.1.2 |- [VM 1's eth0] | |- 1.1.1.3 | \- 1.1.1.4 \- [VM 2's eth0] \- 1.1.1.5 My question is, how do I set up iptables with different rules for the actual physical server as well as the VMs? I don't mind having the VMs doing their own iptables, but I'd like br0 to have a different set of rules. Right now I can only let everything through, which is not the desired behavior (as br0 is exposed). Thanks!

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  • getting the following error in installing qt creator through software center

    - by I'll sudeepdino008
    getting the following error in installing qt creator through software center. The following packages have unmet dependencies: qtcreator: Depends: libqt4-help (>= 4:4.7.1) but 4:4.8.1-0ubuntu4 is to be installed Depends: libc6 (>= 2.15) but 2.15-0ubuntu10.2 is to be installed Depends: libgcc1 (>= 1:4.1.1) but 1:4.6.3-1ubuntu5 is to be installed Depends: libqt4-declarative (>= 4:4.7.4) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-designer (>= 4:4.7.1) but 4:4.8.1-0ubuntu4 is to be installed Depends: libqt4-network (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-script (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-sql (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-svg (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqt4-xml (>= 4:4.7.1) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqtcore4 (>= 4:4.8.0) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libqtgui4 (>= 4:4.8.0) but 4:4.8.1-0ubuntu4.2 is to be installed Depends: libstdc++6 (>= 4.4.0) but 4.6.3-1ubuntu5 is to be installed

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  • How to install remote software NOT on a domain?

    - by Nicros
    I have a situation where some software (that I wrote) is going to be deployed on 60 laptops for an event. The laptops are all running windows 7, but there is no domain controller, and they will all be connected to a 192.168.x.x network using wifi. Is there any convenient way to push the software (consisting of an msi file) can be pushed out to all the laptops and installed? I looked at WMIC, but I think that requires machines be joined to a domain, as does Group Policy. The other alternative is Powershell, but I have literally 4 hours to do this and will have no time to figure out the right script. It's not the end of the world if it has to be done manually (I can find volunteers) but it would be nicer if it could be automated somehow.

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  • Remote X-windows between new RHEL5 and old Solaris 8

    - by joshxdr
    I have a very small lab network with three boxes: a modern x86-based RHEL3 box, an x86-based RHEL5 box, and a 1998-vintage SPARC Ultra5 with Solaris 8. I can use ssh -X to run a program on the RHEL5 box and view the windows on the RHEL3 box. I believe this uses xauth and magic cookies?? I have followed the X-Windows HOWTO to set up xauth on the Solaris box, but so far no dice. I would like to be able to use the X-windows server on the RHEL3 box with a client program on the Solaris box (program running on Solaris host, windows appearing at Linux host). Is there a trick to this, or have I made a mistake following the instructions for setting up xauth and magic cookie?

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  • How can I make a persistent ssh tunnel?

    - by Blacklight Shining
    I have a Mac laptop and would like to have a persistent ssh tunnel so I can always log in from outside the local network. I'm looking for something that will work when the server can't be reached initially (e.g. if I don't have an Internet connection when I boot it), and will automatically start the tunnel when possible. I've tried putting an @reboot autossh line in my crontab, but I've found that sessions started with autossh disconnect every so often, and autossh quits if the first attempt fails. My current workaround is a small script and a cronjob: # crontab /home/blackl/bin/script &! # script #!/bin/sh while true; do ssh -Ngn -R $some_port:localhost:22 $server; sleep 30; done; Is there a better way to do this, or will I just have to be happy with this for now?

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  • Linux Mint on VirtualBox has no internet connection

    - by Martin
    Physical machine: Mac Mini running OSX 10.7.5 Virtual machine: Linux Mint 15 Cinnamon 64-bit Using VirtualBox. I am trying to make the linux connect to the internet. For some reason I can access the host computer with 192.168.2.100. Its set up to show me a web-page that says "It works". This I can see from the linux. But I cannot reach anything on the internet. Either FireFox says "Unable to connect" or when I run nslookup google.com I get connection timed out; no servers could be reached. My setting on VirtualBox under the Network tab are: Bridge Adapter vnic0 promiscouos Mode:Allow All`. If it makes a difference, the host has a WiFi connection to the home router. What have I missed?

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  • What is the breakdown of jobs in game development?

    - by Destry Ullrich
    There's a project I'm trying to start for Indie Game Development; specifically, it's going to be a social networking website that lets developers meet through (It's a secret). One of the key components is showing what skills members have. Question: I need to know what MAJOR game development roles are not represented in the following list, keeping in mind that many specialist roles are being condensed into more broad, generalist roles: Art Animator (Characters, creatures, props, etc.) Concept Artist (2D scenes, environments, props, silhouettes, etc.) Technical Artist (UI artists, typefaces, graphic designers, etc.) 3D Artist (Modeling, rigging, texture, lighting, etc.) Audio Composer (Scores, music, etc.) Sound Engineer (SFX, mood setting, audio implementation, etc.) Voice (Dialog, acting, etc.) Design Creative Director (Initial direction, team management, communications, etc.) Gameplay Designer (Systems, mechanics, control mapping, etc.) World Designer (Level design, aesthetics, game progression, events, etc.) Writer (Story, mythos, dialog, flavor text, etc.) Programming Engine Programming (Engine creation, scripting, physics, etc.) Graphics Engineer (Sprites, lighting, GUI, etc.) Network Engineer (LAN, multiplayer, server support, etc.) Technical Director (I don't know what a technical director would even do.) Post Script: I have an art background, so i'm not familiar with what the others behind game creation actually do. What's missing from this list, and if you feel some things should be changed around how so?

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  • Oracle Partner Days and Oracle Days are coming to an EMEA city near you!

    - by Javier Puerta
    Oracle Partner Days A new round of Oracle Partner Days is coming to a large number of European cities. These events are exclusive for Oracle partners and will deliver to you real Business return on your OPN membership.You will hear the business opportunities coming from the adoption of the entire Oracle stack, the latest products value propositions and related sales strategy and be able to connect directly with Oracle executives and find new business opportunities with other partners in your region.The EMEA Oracle Partner Days are Local/Regional live events targeting the key contacts in sales and consultancy delivering Oracle strategy, engaging around the several perspectives of the Oracle portfolio, executive keynotes and deep dive Business content-related breakout sessions. The first city will be Frankfurt, on Oct. 29. Check the full list to find an Oracle Partner Day in a city near you. Oracle Days Oracle Days will be hosted after Oracle OpenWorld across EMEA, along October and November. By attending an Oracle Day, customers and partners can: Learn about how to leverage the power of the Oracle stack, by hearing customer case studies about successful business transformation, and by following cross-stack solution tracks within the agenda Discuss key issues for business and IT executives in cloud, big data, social, and mobile solutions, and network with peers who are facing the same challenges Meet Oracle experts and watch live demos of new products Get the latest news from Oracle OpenWorld. See full calendar and cities here

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  • How can I learn more about ADF?

    - by jhpierce -Oracle
    Look to the Oracle Technology Network for a wealth of information, tutorials, best practices and coding examples. The place to start is the Oracle Application Development Framework (ADF) web page. The Oracle ADF page has basic information and downloads for ADF, but the real wealth is in the links to other pages. One of the pages is the Oracle ADF Code Corner,  which is a blog-style column that provides hints, tips and coding examples for ADF developers. The content on this page ranges from easy to complex and often contains advanced programming concepts. The content is inspired by questions asked on the Oracle JDeveloper customer forum on OTN. The ADF Code Corner has many articles that will inspire your imagination and possibly solve your coding problem.How about the Oracle ADF Architecture Square link? The Oracle ADF Architecture Square focuses on architectural issues and developer guidelines for writing ADF software solutions. The goal is to give ADF developers an understanding of the necessary decisions for building a successful ADF application, to offer potential architectural blueprints to choose from when putting the ADF application together, and to provide potential ADF best practices to take back to your development team. The Oracle ADF Mobile link gives information on developing mobile applications for iOS and Android based applications. There are links to ADF Mobile Overview, ADF Mobile demos and ADF Mobile courses.The Sample ADF Applications link lists sample applications and other resources where you can find code samples for ADF. These are complete ADF applications that can be downloaded into JDeveloper and give you insight into coding an application.There are many more links found under the "Learn More" tab that can equip the developer with the knowledge they need to develop their applications. There are links to overview papers, technical resources, related topics and available training. The information you need IS just a click away.

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  • What hardware factors may be considered bottlenecks on a Hyper-V virtual server during load testing?

    - by sean
    Our organization is load testing our application using virtual servers via Hyper-V to see what the user load can be using fair equipment on a single box setup. The developer group questioned the validity of the tests given the normal use of the box by the other virtual machines. IT admins answered that it is an acceptable platform to load test on because it has its own CPUs, memory and disks allocated. Is their answer mostly correct? What hardware factors may be considered bottle necks given the other virtual machines when testing our application? For example, would bus speed be a concern or network IO? The application consists of a windows service written using the 4.0 .NET Framework and SQL Server 2008 R2.

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  • Multiple SMTP servers in Thunderbird3

    - by ldigas
    Situation: 2 mail accounts - each with its own pop3 and smtp servers, accesed normally. Except, when using Vodafone mobile network (you know, those usb or pcmcia cards ...) in which case mails are send using Vodafone's SMTP server. I configured both accounts in thunderbird for their default servers, and then added under multiple identities, another called Name of User (mobile) for each account. And it works. Except, I don't like the fact that when I send mail using mobile smtp server it sends them under Name of User (mobile) <-- the mobile part being important. I could of course, delete that part, but then when sending mail, I'd have no way of differenting between the two. They'd both look as Name of User email@address_of_user.com. So, what would be the easiest way to solve this ? It is not a major problem, but it is annoying.

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  • ssmtp for windows

    - by reox
    I have the following problem with a software that should do mail notification for a biometric entry system: the software does currently only support SMTP over port 25 without TLS/SSL. Which is bad because port 25 is blocked in our network due spam reason and our mailserver only support TLS / SSL logins. so i need a solution to connect to a localhost smtp server which just relays to my ssl host on port 587. i know there is ssmtp for linux, but i need it for windows, because the server app for this biometric stuff only runs on windows... edit: i know there is the IIS SMTP Server, but maybe something different?

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  • Conflicts with MS Office temporary files when using Offline Folders on Vista

    - by Tambet
    We are using Offline Folders feature of Windows Vista to make files on network shares available when out of office. Mostly it is working, but every time I do a sync I get a lot of such errors: D500E7B8.tmp - A file was deleted on this computer and changed on the server while this computer was offline. There are hundreds of them. I always select all of them and choose resolution "Delete from both locations". But what is causing this and how can I avoid it? I suspect the reason is that we are using Debian and Samba (3.4.7) on our file server. I've been looking for some Samba options that would cure this, but with no success. I learned that probably the cause is, that both Word and Excel are using specific pattern to change files - they never change the original file, but instead always write a new temporary file and rename it to original file, when you click Save. This is documented here: http://support.microsoft.com/kb/211632/?FR=1.

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  • Does there exist video chat software which works over a LAN between different types of devices?

    - by Graphics Noob
    What I'm trying to do is set up a local area network, without internet access, which allows the users to video chat with each other. The connected devices will include Linux and Android devices, so software which will run with just those two types of systems will work, although running through a browser would be optimal. The most promising lead I've found so far is camfrog, which has a video-chat app for android and a video chat server for linux. The problem is that the documentation for the server is non-existant, and I don't know if the android app can directly connect to the video chat server over a LAN or if it can only connect to camfrog's video chat server over the internet.

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  • How do you explain ethernet cable problems to non networking people?

    - by Bryan McLemore
    We've recently been doing a large network migration in our datacenter. We've had a few cables in this start to deliver really bad pings (in excess of 500ms on a LAN) before they could be replaced. The cables we were replacing weren't made the best. They where all hand made and the runs were so short on some of them that the bend radius was definitely too tight. Some of them ran in bundles right in front of the heat exhaust of the power supplies. The cables were running ok until we started pulling the ones surrounding them out. Then a few started having the problem I mentioned above degrading performance and causing reliability issues. I'm trying to figure out the best way to explain this to non networking people. Is there any documentation that people could recommend or other methods?

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  • Encryption over gigabit carrier ethernet

    - by Roy
    I would like to encrypt traffic between two data centres. Communication between the sites is provided as a standard provider bridge (s-vlan/802.1ad), so that our local vlan tags (c-vlan/802.1q) are preserved on the trunk. The communication traverse several layer 2 hops in the provider network. Border switches on both sides are Catalyst 3750-X with the MACSec service module, but I assume MACSec is out of the question, as I don't see any way to ensure L2 equality between the switches over a trunk, although it may be possible over a provider bridge. MPLS (using EoMPLS) would certainly allow this option, but is not available in this case. Either way, equipment can always be replaced to accommodate technology and topology choices. How do I go about finding viable technology options that can provide layer 2 point-to-point encryption over ethernet carrier networks?

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  • Disable Thunderbird "failed to connect" notifications

    - by The Electric Muffin
    My network manager doesn't start until I log in, so for the first ten seconds or so after I login I have no Internet connection. The problem is that I have Thunderbird set to automatically start on login, so it helpfully tells me it "failed to connect" every time I log in. Also, my Internet connection isn't too reliable, so I sometimes get those messages even when I'm supposedly connected. Is there any way to disable these notifications, while still allowing the ones about new mail? Computer info: Thunderbird 15.0 $ uname -a Linux [HOSTNAME REDACTED] 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Probably irrelevant: NetworkManager Version 0.9.0.1 (nm09 20120407) KDE Platform Version 4.8.4 (4.8.4)

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  • OpenBSD Routing Problem

    - by Ozkan SENOVA
    I am running OpenBSD on a network appliance hardware. It has 5 NICs. I want to give different IP's in same subnet to 3 nics. Eg: em0: 192.168.1.5 em1: 192.168.1.90 em2: 192.168.1.56 I make the necessary configuration with ifconfig, all interfaces works as expected when all the ethernet ports are plugged in to switch. But there is something wrong in routing. If I connect to 192.16.1.5 via any service(http, smtp etc.), traffic goes over link#3. If I unpug the cable from em2 I can't reach any IP's binded on device. Is there any way to route traffic over different links in this IP configuration?

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  • virtualbox port forwarding - firewall config

    - by Roose
    i have a ubuntu host system with virtualbox running a windows server. In Virtualbox i have configured the network with a NAT interface and port forwarding for the RDP deamon running inside the vm. That works really well - i can connect to the windows rdp service over the internet. TCP *:3389 - *:3389 Now i like to restrict the access to the rdp service to only 3 public ip addresses and have no idea how to do that via iptables / shorewall. Something like: ACCEPT net:91.x.x.x fw tcp 3389 (shorewall rule) isn't working. Would be glad for any hint.

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  • Debian crashed, file system is read-only and cannot backup - How Do I find/mount a USB drive?

    - by Spiros
    We have a Debian server (vm's) here at work and the server crashed after a power failure. I can only boot the system in maintenance mode, and the whole file system is set to read only. I can run fsck though maintenance mode, however I would like to get a backup of some files before I do. Problem: I cannot access the net since there is no network connectivity in maintenance mode, and for some reason I try to add a USB flash drive to the computer but I can't find it through the console. Question: how to you find/mount a usb drive on Debian? I have tried several resources from the internet but nothing worked. Is there any other way I could get a backup of my files? I cannot start networking since the filesystem is set to read only. Any help would be appreciated.

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  • linux intrusion detection software

    - by Sam Hammamy
    I have an Ubuntu VPS that I use for practice and deploying prototypes as I am a python developer. I recently started teaching my self sys admin tasks, like installing OpenLDAP. I happened to turn off the ufw firewall for just a minute, and when I ran an netstat command, I saw a foreign ip connected to ssh that I traced to china. I'd like to know a few things: 1) Is there any good network intrusion detection software, such that if any IP that's outside a specific range connects to the VPN, I can be notified? -- I am thinking about scripting this, but I'm pretty sure there's something useful out there and I believe in the wisdom of crowds. 2) How did this person gain access to my server? Is it because my firewall was down? Or is it because they browsed my LDAP directory and from there figured out a way to connect (there was a clear text password in the tree but it wasn't one used by the server's sshd)?

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