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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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  • DRBD with MySQL

    - by tdimmig
    Question about using DRBD to provide HA for MySQL. I need to be sure that my backup MySQL instance is always going to be in a functional state when the failover occurs. What happens, for example, if the primary dies part way through committing a transaction? Are we going to end up with data copied to the secondary that mysql can't handle? Or, what if the network goes away while the two are syncing, and not all of the data makes it across. It seems like it's possible to get into a state where incomplete data on the secondary makes it impossible for mysql to start up and read the database. Am I missing something?

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  • Ubuntu 12.04 Transparent proxy gateway

    - by user146536
    i have a ubuntu server which i want to use as a transparent proxy, (i have no issue setting up squid, just the iptables. The server only has one network interface. The server sits on the same subnet as the router which is the current gateway to the internet for clients, i want to simply set the gateway on the clients pointing at the transparent proxy which in turn forwards the requests to the router and off to the internet. See me diagram, can anybody offer to help with the iptables configuration to achieve this scenario? subnet mask /22 Router(10.4.12.1) Transparent Proxy (eth0, 10.4.12.2) | | +----+----+---------+----+----+ | | | | Comp1(10.4.12.6) Comp2(10.4.12.5) Comp3(10.4.12.4) Comp4(10.4.12.3) Thanks

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  • dhcp client service won't start

    - by xyious
    I have a Laptop with 2 network interfaces and neither will get an IP address through dhcp. I found out that the dhcp client service didn't start. Upon manually starting it gives the error 2: File not found. I have checked that the files were there (both svchost and dhcpcore .dll), the local service account has read access to the system32 folder, the path in the registry is also correct and I can access the file. I have tried to netsh winsock reset and ip reset all. I have even added the local service account to the administrators group. sfc /scannow also came up clean. I have no idea what else I can try. Any suggestions are welcome. (side note it's a windows 7 32 bit, atheros wlan, deinstalled avira before any of the other troubleshooting)

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  • VPN IPsec site 2 site and static routing

    - by Giacomo
    Hello everybody experts! My question is pretty simple, but I can't figure it out because I'm pretty noob with these network stuffs. I have a vpn IPsec site2site between 2 lan with different ip classes, LAN A is class C and LAN B is class A. The vpn presents the LAN A to LAN B with the 10.178.51.64/27 segment. The problem is that when I start the vpn connection I cant Ping any 10.174.0.0/24 address(LAN B remote segment) from my LAN A; I think I need some kind of static route. Could u help me out pls? Thx Regards

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  • Can I take a HDD in Raid1 and plug it straight into a different machine?

    - by jacko
    I would assume that I can just take my HDD out of my NAS (in raid1 mirror) and plug it into another enclosure and have it work off the bat but I'd like to make sure... Any ideas? Edit: My current setup is a Netgear ReadyNAS in (hardware) raid1. I'm hoping to replace this with a home theatre type PC (possibly running Ubuntu), and would like to migrate my data without having to do a bulk transfer over my network between the 2 machines. Can anyone confirm the case for the Netgear ReadyNAS?

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  • Have two exchange servers to communicate together

    - by Data-Base
    We have Exchange Server 2007 using our domain ddd.com. We created an isolated network with a firewall/gateway and installed a DC and Exchange Server 2010 using a demo/test domain (ddd.loc). We opened all the needed ports in the firewall (10.10.2.88) to the Exchange Server 2010. In our main Domain Controller (10.10.2.3) we defined the domain ddd.loc with IP 10.10.2.88 (firewalls). We also we defined MX records to the same IP (10.10.2.88) We did that so when we send email from my email [email protected] it will go to the Exchange Server 2010. Anyways, all the pings test from to any servers are OK. But we are not able to send or receive emails. Between these Exchange Servers we can not send any email from the 2010 to any email in general (emails are pending). Also, in Exchange 2007 we are getting error #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

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  • NAT : understanding about interconnection

    - by PITCHY
    English version below J'ai 2 routeurs A et B relié en série avec les ip respectives ( 10.0.0.1/30 10.0.0.2/30) sur le routeur A j'ai activé la fonction NAT avec un pool (200.0.0.1 - 200.0.0.15/28). Lorsque je sors je prends donc un ip du pool par exemple 200.0.0.10. Comment ça fonctionne sachant que ma nouvelle ip (200.0.0.10) ne se trouve pas sur le meme réseau que mon interface de destination (10.0.0.2)? English: I have 2 routers A and B, interconnected with a serial connection, with the ip's 10.0.0.1/30 for A and 10.0.0.2/30 for B. On router A NAT was activated with the pool 200.0.0.1 - 200.0.0.15/28. When connection to this router, I get an ip from the pool, for example 200.0.0.10. Knowing my new ip is 200.0.0.10, which is not on the same network as my destination interface (10.0.0.2), how can this work?

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  • Prevent folder deletes at top level only on Server 2008

    - by DomoDomo
    I'm trying to prevent folders moves, really folder delete in NTFS parlance, for series of folders within a network share. So let's say I have: FolderA, FolderB, FolderC. Each folder has various files and subfolders. I want the Domain Users group to have modify access to all files and folders beneath FolderA, FolderB, and FolderC. However I don't want them to be able to delete these three top level folders. The issue we are having right now is people keep accidentally dragging one top level folder into another. I've tried used advanced NTFS permissions to deny domain users delete access to these top level folders, and set the permissions to apply to "This folder only", however it seems to only affect sub-folders, and not the top level. Platform is Server 2008 Standard. Thanks in advance.

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  • Diving into a computer science career [closed]

    - by Willis
    Well first I would like to say thank you for taking the time to read my question. I'll give you some background. I graduated two years ago from a local UC in my state with a degree in cognitive psychology and worked in a neuroscience lab. During this time I was exposed to some light Matlab programming and other programming tidbits, but before this I had some basic understanding of programming. My father worked IT for a company when I was younger so I picked up his books and took learned things along the way growing up. Naturally I'm an inquisitive person, constantly learning, love challenges, and have had exposure to some languages. Yet at this point I was fully pursue it as a career and always had this in the back of my head. Where do I start? I'm 25 and feel like I still have time to make a switch. I've immersed myself in the terminal/command prompt to start, but which language do I focus on? I've read the A+ book and planning to take on the exam, then the networking exam, but I want to deal with more programming, development, and troubleshooting. I understand to get involved in open source, but where? I took the next step and got a small IT assistant job, but doesn't really deal with programming, development, just troubling shooting and small network issues. Thank you!

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  • Windows 7 default VPN - Single Click to Connect

    - by Goyuix
    The default way to connect to a VPN (standard includedd MS client) seems to be to click on the network icon in the system tray to expand it, then pick the VPN connection, and click the connect button. This brings up a dialog where you can enter your username and password. I have told the VPN connection to remember my credentials. Is there some way I can skip that dialog and just have it connect? I have tried using rasdial.exe, and I can connect as long as I pass the username and password as arguments. It doesn't seem to want to use the stored credentials for some reason, maybe I need to store them with an elevated account.

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  • Mcafee Auto-update from UNC path problem

    - by Vicky
    I have a network with 50 computers with no internet access. So instead of updating in each of them using dat file individually I tried to create a shared folder in server, and created a UNC in site repository. I downloaded the file DAT Package For Use with Mcafee AutoUpdate Architect & ePO 3.0 from http://www.mcafee.com/apps/downloads/security-updates/security-updates.aspx. When I try to update it is giving an error Error occurred while downloading file SiteStat.xml. So how fix it?

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  • Airpot Express configuration

    - by Christina
    We are trying to set up remote access to a computer that houses a server fro a particular program we are running. The program says we need to configure the office router. In the firewall settings it says to open ports 5345-5351 (TCP only). Port Forwarding: You will also need to forward the same range of ports (5345-5351) to the computer running the Server. This typically requires that the computer running the Server be assigned a static IP on the local network. Having trouble figuring out which IP address we actually need to be using on the client side of this program in order to access the server computer. Can someone walk through this process?? We are working on Mac OSX 10.5. Thank you in advance!

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  • Suggestions for a Self-serv advertising service

    - by Mystere Man
    I am seeking a self-serv advertising service for my websites, but I have a few restrictions that seem to make what i'm looking for hard to find. Specifically, I want to place "advertise here" links on my pages and allow end-users to purchase advertising on that site, page, and location. These ads will not be part of a national network. Supports multi-tenancy - That is, I have a number of domains using the same "web application" but with customized content per domain. When a customer wants to advertise on a given domain, then the ads will only appear on that domain and on that page of the domain (even though the page name may be the same across multiple domains). Supports fixed ad prices, not just CPC. I need monthly and quarterly pricing regardless of performance. Integrates with OpenX and other ad networks, so that if there is no self-serv on a given zone, it will use national advertising or direct advertising. Shiny Ads has much of this, but i'm looking for alternatives, as their prices are a bit crazy (20%) and can only do PayPal.

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  • Working with Git on multiple machines

    - by Tesserex
    This may sound a bit strange, but I'm wondering about a good way to work in Git from multiple machines networked together in some way. It looks to me like I have two options, and I can see benefits on both sides: Use git itself for sharing, each machine has its own repo and you have to fetch between them. You can work on either machine even if the other is offline. This by itself is pretty big I think. Use one repo that is shared over the network between machines. No need to do git pulls every time you switch machines, since your code is always up to date. Never worry that you forgot to push code from your other non-hosting machine, which is now out of reach, since you were working off a fileshare on this machine. My intuition says that everyone generally goes with the first option. But the downside I see is that you might not always be able to access code from your other machines, and I certainly don't want to push all my WIP branches to github at the end of every day. I also don't want to have to leave my computers on all the time so I can fetch from them directly. Lastly a minor point is that all the git commands to keep multiple branches up to date can get tedious. Is there a third handle on this situation? Maybe some third party tools are available that help make this process easier? If you deal with this situation regularly, what do you suggest?

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  • Running a webserver behind a firewall, is it secure?

    - by i.am.intern
    Currently we have a Linux-based firewall which NAT-ing our public IP address to give internet access to our staff's PCs and a Windows Server 2003 for internal filesharing. I want to host Redmine/SVN (a bugtracker) internally behind this firewall using a Linux server. This webserver will be accessed by our clients externally so they can post bug reports. This means that I have to open port 80 & 22 at the firewall to give access to the webserver and me to SSH it from home. However, let's say I'm using password-based SSH for the webserver and somebody cracked it. Does that mean the cracker could ping and access other servers and PCs in the network?

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  • Two routers, one off-site, same ISP-assigned static IP. A recipe for conflict?

    - by boost
    This is the situation I've inherited: There are two routers, one off-site. Both are connected to the ISP. The ISP assigns both of them the same static IP (or so it seems). Presumably, the network problems we're having are related to the idea that you can't have two instances of the same IP. So we rang up the folk off-site and told them to turn off the router. Now everything's working okay here. How do I get around this? Get another static IP? Figure out how to get the router to ask for a dynamic IP (as we're not using the static IP for anything)?

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  • View scheduled recordings remotely

    - by Scott
    I have one computer which is equipped with a TV tuner card. The Recorded TV folder is shared so that other computers on the network can watch recordings. Now that I am upgrading my computers to Windows 7, they have Media Center, which makes for a nicer viewing experience than a Windows Explorer folder view. I have set up Media Center on my laptop to considering the Recorded TV folder on the tuner-equipped PC as an extended library location, so now I can view all the recordings from within Media Center on the laptop. To make this experience even better, is there a way to view the list of scheduled recordings on the tuner-equipped PC from within Media Center on my laptop?

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  • Ubuntu from console/command-line/shell

    - by Xolve
    Earlies linux distros though required lot of manual work they were quite good to use from commandline. If the X-server didn't start or you just want a shell to work they all supported. Network was configured by init; sound was up and ready; new devices inserted would be configured and their configureation was placed in fstab. Also there were small scripts I found on many distros which on X used windows while on console they switched to ncurses. But now this all needs GUI with a desktop manager (KDE, GNOME) for the new paradigms :'-( require GUI (NetworkManger, hal etc.). So if on just command line you have to be root, looks like they believe only geeky admins need that, and need to edit config files or type big commands. Any way so that this is easy in Ubnubtu through shell again.

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  • Yahoo toolbar and local sites (e.g. Intranet)

    - by Klaptrap
    We have local sites running on IIS in regular MS Windows network. User base has IE, FireFox and Chrome. Local sites are isolated by host headers and DNS record created for the common IP accordingly. This is a regular set-up. Users without Yahoo Toolbar type http://intranet and the sites resolves. Users with Yahoo toolbar type http://intranet and the toolbar goes off to search for this site in public domain. This is irrespective to whether the address is typed into the browser address bar or the toolbar. All versions of toolbar and IE are affected. I cannot see a setting on the toolbar to switch this "irritating" behaviour off and simply un-installing the toolbar is not an option. Any ideas?

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  • Binding services to localhost and using SSH tunnels - can requests be forged?

    - by Martin
    Given a typical webserver, with Apache2, common PHP scripts and a DNS server, would it be sufficient from a security perspective to bind administration interfaces like phpmyadmin to localhost and access it via SSH tunnels? Or could somebody, who knew eg. that phpmyadmin (or any other commonly availible script) is listening at a certain port on localhost easily forge requests that would be executed if no other authentication was present? In other words: could somebody from somewhere in the internet easily forge a request, so that the webserver would accept it, thinking it originated from 127.0.0.1 if the server is listening on 127.0.0.1 only? If there were a risk, could it be somehow dealt with on a lower level than the application, eg. by using iptables? The idea being, that if someone found a weakness in a php script or apache, the network would still block this request because it did not arrive via a SSH-tunnel?

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  • what to do when ctrl-c can't kill a process?

    - by Dustin Boswell
    Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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  • Reasons for Wi-Fi to be slower on Ubuntu compared to Windows?

    - by den-javamaniac
    I'm using 64-bit Ubuntu 12.04 and Windows 7 64 bit – dual boot on the same computer. Connecting to the same wireless network. And it turns out that on Windows I get a more stable and stronger signal than on Ubuntu. To my knowledge there's a router which serves as a gateway and then there's a cable connected to the router which goes further to ISP, so the results for both OS should be the same. I've tested the issue on both OSs at various times and it gave me the same result. The question is why? Why Ubuntu networking is worse than that of Windows?

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  • Is it possible to hide the SSID of the Windows 7 soft AP

    - by Goro
    I know it is possible to create a sofware AP in windows 7 using command prompt: netsh wlan set hostednetwork ... But is it possible to set such a network not to broadcast its SSID? I realize that this does not gain any security - or may even make the system more secure, but I am not asking about security here. I want to know if it is possible, through the netsh command interface, to hide the SSID. If my client wants to hide the SSID, then I will make them aware of security implications, but in the end it is their decision.

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  • Filemaker Server Not Installing and Windows Problems

    - by Shelly
    When I tried installing Filemaker Server 8.0 on Windows 2003 Server Standard Edition R2, an error message pop up that states: MMC has detected an error in a snap-in. It is recommended that you shut down and restart MMC. After this message pops up, Filemaker Server freezes. I'm also having problems with openssl and running executable files, but am not sure if the 2 are related. Error message for openssl states: Openssl.exe encountered a problem and needed to close. In one of the computers connected to the network running this same Server 2003 R2, when I tried double-clicking on Dr. Web antivirus to do a scan, nothing happens. I have done this many times before reinstalling the server, and it never gave trouble before this. Any help given is appreciated.

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