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• Whats the easiest route to trying out mono 2.6?

  - by E J

  We have several web applications built on Microsoft technologies (asp.net+mvc framework, built using VS2008, MS SQL Server). I have recently be playing with Ubuntu (9.10), installed using Wubi, and wanted to see if I can get our apps running on a foss software stack. I have got the hang of the very basics of Postgresql and I have read that there is some support for Linq to SQL in mono (as of 2.6) as well as asp.net/MVC. However I am unsure how to go about getting Mono 2.6 up and running. Here is what I have discovered so far: Ubuntu is not meant for the 'cutting edge' it is designed to be stable hence, it sometimes takes a release cycle or two for new software to make it to the repositories Mono is already installed by default, but it is likely to stay at version 2.4 for at least the 10.4 release You can install paralell environments of Mono, if you know what your doing. I have had a go at setting up parallel environments, but haven't had any luck yet. (And TBH I am not certain that that will do what I think it's gonna do). (tl;dr start here) Is there a distribution of Linux similar enough to Ubuntu, that I wouldn't have to start the learning curve all over again, but that will let me install Mono 2.6, Postgresql, (and possibly mono-develop 2.4)? Or should I persist with Ubuntu?

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• What would cause Memcached to Hang for 2+ seconds?

  - by Brad Dwyer

  I'm going nuts trying to scale memcached. From their site: Memcached operations are almost all O(1). Connecting to it and issuing a get or stat command should never lag. If connecting lags, you may be hitting the max connections limit. See ServerMaint for details on stats to monitor. If issuing commands lags, you can have a number of tuning problems. Most common are hardware problems, not enough RAM (swapping), network problems (bandwidth, dropped packets, half-duplex connections). On rare occasion OS bugs or memcached bugs can contribute. Well.. it is most certainly not performing like an O(1) operation for me. Under low to normal load on our site memcached response times for get and set ops are about 0.001 seconds. Not bad. But if we triple the load we get outliers that take 100x (or in rare cases 1000x!) that long. I even had one instance where it took 2.2442 seconds for memcached to store a value. Obviously this is killing our site. Here's the output of Memcached-getStats during one of the slow periods: [pid] => 18079 [uptime] => 8903 [threads] => 4 [time] => 1332795759 [pointer_size] => 32 [rusage_user_seconds] => 26 [rusage_user_microseconds] => 503872 [rusage_system_seconds] => 125 [rusage_system_microseconds] => 477008 [curr_items] => 42099 [total_items] => 422500 [limit_maxbytes] => 943718400 [curr_connections] => 84 [total_connections] => 4946 [connection_structures] => 178 [bytes] => 7259957 [cmd_get] => 1679091 [cmd_set] => 351809 [get_hits] => 1662048 [get_misses] => 17043 [evictions] => 0 [bytes_read] => 109388476 [bytes_written] => 3187646458 [version] => 1.4.13 So things that I have ruled out so far are: Hitting the max connections limit (curr_connections of 84 is well below the default of max of 1024) Swapping - the machine has 900M out of 1024M of memory dedicated to memcached on a dedicated machine. It only appears to be using about 7MB of data as per the bytes stat. How would I diagnose the other hardware problems? prstat doesn't really show a whole lot going on in terms of CPU or memory usage. Not sure how to figure out the network problems but as this is a dedicated server on the same private network as the web box I don't think it's a connectivity issue (ping is less than a millisecond between the boxes). Is there something else I'm missing here? It's driving me nuts. Edit: Also forgot to mention that I've tried both persistent and non-persistent connections with minimal-to-no impact.

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• What NAS setup for syncing over the internet?

  - by Jamse

  I have family living a few hours away and have a lot of files that I would like to share - especially lots of folders of digital photos, but also documents etc. - partially so they can see them, partially so I can have access when I visit them and partially for backup / redundancy purposes. My current hard drives on my main machine are getting pretty full anyway, and I have a MythTV box where my music is currently stored, so I was thinking of getting a NAS anyway. And at the other end my family have a few computers, so they would probably benefit from a NAS too. My general idea (though I'm willing to shift on this if there are any bright ideas about other ways of achieving my objectives) is to get a matching pair of NASs and have them sync over the internet. (To cut down on bandwidth use I would get them in sync locally to start with.) Having read around as best I can it seems that syncing over the internet is generally only a feature on quite high end units. However, I have seen that QNAP seem to feature this on their TS-110 and TS-210 units, which might work (they call it "remote replication"). They seem pretty reasonably priced for what they are, but of course with buying 2 of them and then adding the drives (say 1TB or 2TB each) I'd be looking at about £400 total. So, I'm looking for recommendations really. I don't want to spend more than the QNAPs would cost me, but any other ideas would be most appreciated. I am comfortable with technology and tinkering around, but I don't have as much time for that as I would like, so I guess I would favour solutions that require less tinkering rather than more (even though that's less fun!). Any thoughts would be welcome, as would any comments from people who have used the QNAP boxes for this. Thanks in advance. Some specifications: Two-way syncing. Changes made at either end should be synced to the other. There shouldn't be one unit that is effectively a read-only mirror of the other. Not real time. The syncing doesn't need to be real time - if it updated, say, daily overnight that would be fine. Set and forget. I would prefer minimal user interaction once set up - it would be great if syncs were scheduled and automatic. OS independence. I am running Windows XP plus an Ubuntu-based MythTV box. At the other end there are Windows 7 and Windows XP machines, plus a networked TV set top box which I think can play files off the network. Machine independence. I would favour a system that is self-contained, i.e. not reliant on any particular PC being switched on. If the system had enough else going for it I could perhaps work around it at this end, where I only have one PC that's used as such, but it would be harder at the other where there are at least two PCs that might be accessing the files. Notifications. I guess things like getting an email notification if the syncing fell over for any reason would be useful, though it's not a deal breaker.

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• Best console based text editor not only for programmers [closed]

  - by robo

  I need console based text editor for writing both source codes and human readable texts such as emails. I need it to be user friendly. It mean for me: You can use it the same way as the notepad or gedit. You can use mouse there. If you need your mother of girlfriend or somebody to edit your text they will know what to do, they will not realize it is a console and will have only a feeling it is something like a notepad. copy, paste, undo works as usual with usual key combinations (Ctrl-C, Ctrl-V, Ctrl-Z). shift and arrows works as usual. They select the text. And when I return to the computer I want to use the text editor for programming. I expect: Syntax highliting auto indenting replacing spaces with tabs keyboard shortcuts for compiling possibility to configure it to use a debugger autocompletions for c#, java, c++ and other languages other things I expect from IDE's. I was working and configuring vim for a few years. But It never fulfilled all of my expectations (but it almost did). I thing I could get vim configured perfectly if I had few more weeks time for configurating it. Unfortunately I cannot afford to be configuring vim forever. Is there other alternative? Hopefully some editor I once set up and it will works forever? What do you use? I often hear people are using emacs. Is it worth learning?

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• How to host an ssh server?

  - by balki

  Hi, I have a broadband internet connection. I have an wireless modem (Airtel India). I don't have a static ip address. I want to host a ssh/web/ftp server to be visible to the outside world just for testing and learning purpose so I can ask my friend to connect to my current ip address and test. My modem has an admin interface which allows to port forward and open ports. I set up ssh server as shown and checked if port 22 is open using this website , Port Scan And port 22 is open. I have an openssh server running and it works if i do, ssh [email protected] which is my local ip address but doesn't work if i do ssh [email protected] where 122.xx.xx.xx is my external ip address of my modem which i checked from whatismyipaddress.com. Since it looks like the port is open, I wonder if there is some setting I need to change in my server config to expose my server. How should I go about solving this?

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• FreeNAS pool configuration - RAID1 + other drives

  - by trnelson

  Simple questions, really. I found this answer with a similar setup, but not sure it answers my question. If it does, I'm curious why since the answer seems a bit unsure: ZFS Hard Drive Configuration in FreeNAS I'm building a server which will be used primarily for backup, plus some media streaming, possibly with Plex. I seem to understand most everything I need, but I'm still a bit confused on how pools work, and how to configure them for my scenario. I will have 2x 2TB WD Red drives, which I plan on using in a mirrored set up (RAID1). This would be for backup, and I'd also like to do offsite backup to my CrashPlan account from this array. I also have a few other drives: 1.5TB, 320GB, 250GB. I'm not sure exactly what to do with them yet, but looking for options. FreeNAS OS will be running from a 16GB USB Flash drive. Would it be wise to use the 1.5TB as a backup-backup, essentially as a mirror or perhaps for snapshots of the 2TB RAID1? I'm still learning about snapshots. Should the 2TB mirrored drives be in their own pool? Should the other drives be set up in their own pools as well, or should they be JBOD in a single pool? They may or may not get much use since the 2TB array is plenty for me. Does a dataset basically mimic the idea of a partition or a network share? In other words, I would map \SERVER\Share to X: on my laptop? Let's say I wanted to use the 250GB drive as an encrypted drive to store all of my cat pictures. Would it have to be in its own pool? If I use jails apps, should they go in the backup RAID1, or in another place? Thank you!

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• Technology mash: is this possible?

  - by Jon Story

  I'm in the process of setting up my own DNS+hosting on a couple of VPS and my home machines, mostly for academic/learning purposes, but also for convenient accessing of my files, hosting my personal websites, private git repositories etc. I've got a main web server with DNS, and a slave DNS server. I've also got a couple of machines at home doing file hosting, video streaming and all that fun stuff. I'm intending to use my VPS's to provide myself with a dynamic DNS system so that I can point mydomain.com at my DNS servers, with home.mydomain.com going into my home network via a raspberry pi. HOWEVER.... I've not got access to the network infrastructure at home (rented accommodation with managed internet), so I can't forward the ports on the router to my own machines. As such, I'm wondering if it's possible to route all the traffic via an SSH/HTTP tunnel through one of the VPS? My plan is to have the raspberry pi provide a VPN into my home network. The raspberry pi uses SSH to connect to the VPS, and the VPS forwards any traffic to home.mydomain.com via the tunnel to the raspberry pi. Is this even possible, and how do I go about it? I don't mind getting my hands dirty with coding and low level tools, I'm just not sure where to start or what the best way to go about it is.

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• Syntax error on line 494 of httpd.conf: Cannot load .../php5apache2_2.dll into server

  - by pikachu

  I have been learning PHP. I had installed Apache-server (not in a combination-suite like USBWebserver). Now I'm trying to put my sites on a portable stick, using USBWebserver. I already used that program before to carry MySQL databases with me (and Apache worked as well, cause I used the included PHPMyAdmin for managing the databases.), but now it doesn't work anymore. When I start the program, I keep having the text saying Apache is offline. I've tried to open Apache using the command line (don't know what that would do, but, it's just a try). I got an error message saying Syntax error on line 494 of C:/.../httpd.conf: Cannot load C:/.../php5apache2_2.dll into server: (The following is translated from Dutch) An initialization routine of the dynamic link library (dll-file) has failed. Line 494 says this: LoadModule php5_module "C:/Users/School/Downloads/USBWebserver v8_en/php/php5apache2_2.dll" My first Apache installation (its service) is not running. The ports are different. And I also uninstalled the service (using the httpd.exe -k uninstall command); What can be the problem? Thanks for help.

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• Unable to connect to server after a certain amount of time

  - by Troy

  I am a business FIOS subscriber with 5 static IPs. I have the following network setup: Verizon provided ONT Dlink switch Dell server running Ubuntu 12.04 with iptables enabled and a static IP address. The makes/models of hardware are: FIOS ONT Alcatel-Lucent I-211M-H ONT D-Link D-Link Web Smart Switch DES-1228P Server Dell Optiplex 755 (Ubuntu 12.04 Server) I have iptables running on the server with http, https and ssh ports open. I can connect to a website on the server from an external computer, but after a certain amount of time (mins to hours), I can no longer connect. All I have to do to re-enable connectivity is connect to the server via SSH from a computer INSIDE the network. I don't have to actually login, I just have to establish a connection. I can then access the website externally again. I did some googling and it seems some of verizon's equipment had an ARP bug where the ARP entries would expire after a certain time period, but those issues all seem to be from back in 2009 - 2010. I know the switch has an 'auto learning Mac address' feature, but I'm not sure if that could be the problem or not. Does anyone have any ideas or advice on how I can troubleshoot this? Thanks!

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• Turn computer into DAS (Direct Attached Storage)

  - by Damon

  Can we build a direct attached storage by taking a computer/server, adding an HBA, and installing some appropriate software? We would use Debian as a host OS for both the DAS and the server. If so, what software do we use? And do we simply need a HBA for the DAS and the Server? Or do we need more hardware? The goal is to use an older server that does not have enough room for drives but does have ECC memory, server processors, redundant power supplies, dual nics, etc. Then find any boxes, server or not, the key being having enough room for 8-12 drives, fans, etc. and turning them into a DAS; build two of these DAS's and have them connected to the server. Eventually we want to have two servers using DRBD and associated services like heartbeat and pace maker to create an HA setup for our server(s) but that will take a long time to configure since I have no experience with anything related to DRBD (yet) and have a learning curve I have to get past, not to mention the additional cost of more hardware (two servers vs one).

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• How can I make subversion reset the stored passwords/users and remember my authentication credential

  - by NicDumZ

  Hello folks! Background: I used to have everything working just fine on my fresh install: $ svn co https://domain:443/ test1 Error validating server certificate for 'https://domain:443': - The certificate is not issued by a trusted authority. Use the fingerprint to validate the certificate manually! Certificate information: - Hostname: **REMOVED** - Valid: **REMOVED** - Issuer: **REMOVED** - Fingerprint: **checked with issuer and REMOVED** (R)eject, accept (t)emporarily or accept (p)ermanently? p Authentication realm: <https://domain:443> Subversion repository Password for 'nicdumz-machine-hostname': Authentication realm: <https://domain:443> Subversion repository Username: nicdumz Password for 'nicdumz': # proceeds to checkout correctly $ svn co https://domain:443/ test2 # checkouts nicely, without asking for my password. At some point I needed to commit stuff using a different account. So I did that $ svn ci --username other.user Authentication realm: <https://domain:443> Subversion repository Password for 'other.user': # works fine But since then, everytime I want to commit as 'nicdumz' (default user, all repos have been checked-out with that user), it prompts me for my password: $ svn ci Authentication realm: <https://domain:443> Subversion repository Password for 'nicdumz': Hey come on, why :) The same happens if I want a fresh checkout, since read-access is also protected. So I tried fixing the issue by myself. I read around that ~/.subversion/auth was storing credentials, so I removed it from the way: $ cd ~/.subversion $ mv auth oldauth $ mkdir auth It seemed to work at first, because svn had forgotten about certificate validation: $ svn co https://domain:443/ test3 Error validating server certificate for 'https://domain:443': - The certificate is not issued by a trusted authority. Use the fingerprint to validate the certificate manually! Certificate information: - Hostname: **REMOVED** - Valid: **REMOVED** - Issuer: **REMOVED** - Fingerprint: **checked with issuer and REMOVED** (R)eject, accept (t)emporarily or accept (p)ermanently? p Authentication realm: <https://domain:443> Subversion repository Password for 'nicdumz-machine-hostname': Authentication realm: <https://domain:443> Subversion repository Username: nicdumz Password for 'nicdumz': # proceeds to checkout correctly $ svn up Authentication realm: <https://domain:443> Subversion repository Password for 'nicdumz': What? how is this happening? If you have suggestions to investigate more about the behaviour, I am very interested. If I'm correct, there is no way to do a verbose svn up or anything of the like, so I'm not sure should I go for investigation. Oh, and for what it's worth: $ svn --version svn, version 1.6.6 (r40053) compiled Oct 26 2009, 06:19:08 Copyright (C) 2000-2009 CollabNet. Subversion is open source software, see http://subversion.tigris.org/ This product includes software developed by CollabNet (http://www.Collab.Net/). The following repository access (RA) modules are available: * ra_neon : Module for accessing a repository via WebDAV protocol using Neon. - handles 'http' scheme - handles 'https' scheme * ra_svn : Module for accessing a repository using the svn network protocol. - with Cyrus SASL authentication - handles 'svn' scheme * ra_local : Module for accessing a repository on local disk. - handles 'file' scheme * ra_serf : Module for accessing a repository via WebDAV protocol using serf. - handles 'http' scheme - handles 'https' scheme

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• Can spliting an access database cause printer and reporting issues?

  - by leeand00

  We have a setup in which our users log into an access database using MS Access 2003 over an RDP connection. The user's login to their own machines first using a roaming profile. They then click an rdp connection file on the desktop and login to the remote server, via RDP, where they use MS Access as the shell; they don't have any access to any of explorer.exe features such as the start menu. The database they are logging into is more of an application, and provides functionality for entering data, querying data, and running reports via form based menus. It all worked pretty well until we split the database as it was nearing 2GBs in size. We moved out the payroll data into a separate partition, a database with the same name in a different folder, both of them on the server. Only two tables were moved into this new database partition, and they were re-linked as external tables in the new partition. Now while everything appears to be working fine data-wise after the split, there's a new issue when our users login via RDP and attempt to run reports: often the report will not display and instead the user sees an error about the click event of the form. At first I didn't even know it was printer-related, as we didn't really change anything related to the printers as far as I knew. Confused about the error, I talked to the guy who previously worked here and who was in charge of splitting the database, and he told me to tell the users to set their default printers (on their local machines, not on the server) to the "printer" Microsoft XPS Document Writer which isn't a physical printer at all. This allowed the user's to display their reports, but if they want to print out reports, they are required to go to the File menu and select Print, clicking the print icon on the toolbar takes them to a Save As... dialog as would be expected when using the Microsoft XPS Document Writer as your default printer. It's easy to tell if the user is having a problem because a quick mouseover of the printer icon will yield a tooltip of (none) when they cannot access their reports, and a tooltip of Microsoft XPS Document Writer when they can view the reports. If the user's printer is set to anything other than Microsoft XPS Document Writer as the default on their local machine, then (none) is always displayed when they rdp to the database. The RDP settings are setup to transfer the local printer to the server. Telling the users to do this to print has been more of a band-aid on the whole situation until we find a better solution and an explanation as to why splitting a database would prevent users from printing or even viewing access database reports. Which is why I'm here asking this question. Also of note all the printers on the network now show up on the server so that when the users do click File->Print to print their reports on a physical printer, they have to look through a huge list of printers to find theirs in the dropdown. So the little band-aid fix we have is not ideal. Previously, only the printers on the user's local machine displayed here, and not all the printers on the network. My co-worker seems to think this has something to do with permissions, I personally think it has to do with roaming profiles, and Group Policies which is what I've been reading up on. I really don't know how to fix this or how it is related to splitting the database.

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• Run a rails server on Amazon EC2 [on hold]

  - by Jashwant

  Context: I've tried rubber gem, but that does not fulfill my requirements ( I needed to deploy on existing instance, so don't recommend me rubber) So, I followed this excellent tutorial http://stackoverflow.com/questions/15535140/installing-ruby-2-0-and-rails-4-0-0beta-on-aws-ec2 Now, I have ruby 2.0 and rails 4.0.0 running on AWS EC2. I successfully ran the server with RDS (mysql) as db and default webrick as server ( Using command rails server ) But, I've read that webrick is a development server and shouldn't be used at production. What I tried: I googled and came up with some alternatives. Capistrano Nginx / apache with passenger Passenger with Capistrano Unicorn Puma My Question: What exactly is capistrano / passenger ? Are they middleware to ease my deployment process ? I don't see any difficulty in doing rails server command. If they are just middleware, nginx with passenger and capistrano does not make any sense ? Why would I add a learning curve ( to learn nginx, passenger and capistrano configs) just to run my server ? I can just use nginx to deploy my app. Can't I ? What combination should I use on Amazon EC2 (or may be at any some other production server).

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• How to locate phpmyadmin on ubuntu

  - by Chris

  Okay, I'm usually a windows user and I write quite happily there, unfortunately (or fortunately) I have installed linux on a dual boot and having installed some software I have a question... Where is it? I installed Apache, PHP, MySQL and separately phpmyadmin, Apache is up and running, I've seen my phpinfo page and MySQL is there. MySQL is telling me that there's a database for phpmyadmin, but...erm.. I can't seem to locate it. On a windows machine the directory would be in the www directory and I'd just navigate there... localhost/phpmyadmin/ but on Ubuntu I can't find it in the equivalent. I've been to /var/www/ and there's my index.html (from apache) and my phptest.php file but no phpmyadmin. There is a phpmyadmin in /lib but that only has 2 files in it. So having rambled lots, my question is, what do I have to do to be able to navigate to the phpmyadmin index page? I realise this could fall under the description of a server related question and should be posted elsewhere but as it's software on a home system some help would be appreciated. Do I need to move some files from somewhere? Help! I really don't want to have to go back to developing on Windows as I'll be deploying to a lamp system, my learning curve will be steep.

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• How to create an GUI that communicate with the USB Devices using win32 programming [migrated]

  - by VINAYAK

  I am doing my Project using win 32 programming.I am just learning about win32 programming and able to create an UI.I want to communicate with an USB Device with that UI.SO,How can i go for that?Is there any predefined functions will be there are we need to create the function for communicating with the OS and get the devices List and got the details about them. My purpose is to , 1.Creating an UI that tells about the Basic information about the device(We want to send a control request to the device to get the descriptors). 2.For that first of all i want to communicate with the OS for device attachment.That will lead to get the information about the device and Enumeration takes place and then only i request the device information through descriptors by using standard Requests. 3.And also i want to create the driver for my device.That will also need to achieve for communicating with OS(Windows). So,can anyone help me about this?How can i achieve this or approach this? Note: I am at the entry level now so anyone give response will be in a detailed format like step by step process would be appreciable.

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• Is it bad to redirect http to https?

  - by jasondavis

  I just installed an SSL Certificate on my server. I use a web hosting panel called ZPanel that is an open source project. It then set up a redirect for all traffic on my domain on Port 80 to redirect it to Port 443. In other words, all my http://example.com traffic is now redirected to the appropriate https://example.com version of the page. The redirect is done in my Apache Virtual Hosts file with something like this... RewriteEngine on ReWriteCond %{SERVER_PORT} !^443$ RewriteRule ^/(.*) https://%{HTTP_HOST}/$1 [NC,R,L] My question is, are there any drawbacks to using SSL? Since this is not a 301 Redirect, will I lose link juice/ranking in search engines by switching to https? I appreciate the help. I have always wanted to set up SSL on a server, just for the practice of doing it, and I finally decided to do it tonight. It seems to be working well so far, but I am not sure if it's a good idea to use this on every page. My site is not eCommerce and doesn't handle sensitive data; it's mainly for looks and the thrill of installing it for learning. UPDATED ISSUE Strangely Bing creates this screenshot from my site now that it is using HTTPS everywhere...

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• Should I use nginx exclusively, or have it as a proxy to Tomcat (performance related)?

  - by Kevin

  I've planned to create a website that'll be pretty heavy on dynamic content, and want to know what would be the wisest choice for part of my webstack. Right now I'm trying to decide whether I should develop upon nginx, using PHP to deliver the dynamic content, or use nginx as a proxy to Tomcat and use servlets to deliver the dynamic content. I have a good amount of experience with Java, JSP, and servlets, so that's a plus right off the bat. Also, since it is a compiled language, it will execute faster than PHP (it is implied here that Java is around 37x faster than PHP) , and will create the web pages faster. I have no experience with PHP, however i'm under the impression that it is easy to pick up. It's slower than Java, but since the client will only be communicating with nginx, I'm thinking that serving the dynamically created web pages to the client will be faster this way. Considering these things, i'd like to know: Are my assumptions correct? Where does the bottleneck occur: creating pages or serving them back to the client? Will proxying Tomcat with nginx give me any of nginx performance benefits if I'm going to be using Tomcat to generate the dynamic content (keeping in mind my site is going to be heavy in this aspect)? I don't mind learning PHP if, in the end, its going to give me the best performance. I just want to know what would be the best choice from that standpoint.

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• Does SNI represent a privacy concern for my website visitors?

  - by pagliuca

  Firstly, I'm sorry for my bad English. I'm still learning it. Here it goes: When I host a single website per IP address, I can use "pure" SSL (without SNI), and the key exchange occurs before the user even tells me the hostname and path that he wants to retrieve. After the key exchange, all data can be securely exchanged. That said, if anybody happens to be sniffing the network, no confidential information is leaked* (see footnote). On the other hand, if I host multiple websites per IP address, I will probably use SNI, and therefore my website visitor needs to tell me the target hostname before I can provide him with the right certificate. In this case, someone sniffing his network can track all the website domains he is accessing. Are there any errors in my assumptions? If not, doesn't this represent a privacy concern, assuming the user is also using encrypted DNS? Footnote: I also realize that a sniffer could do a reverse lookup on the IP address and find out which websites were visited, but the hostname travelling in plaintext through the network cables seems to make keyword based domain blocking easier for censorship authorities.

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• A very peculiar problem with an old pc and a newer laptop...

  - by user553492

  I got my old pc ( 248mb ram , 80 GB ) repaired and the tech people put XP in it .My newer laptop has UBUNTU 10.04 .now I only have one cable and one usb cord .So I connected my modem (with only one CAT5 port and 4 usb ports ) to laptop with CAT5 cable .Th internet is working fine . I also wanted to use net on older pc so I installed the usb drivers for win and it worked. But I got fed up of win xp and made a separate partition for FreeBSD which I planned to install .During the install I screwd up sumthing and now freebsd starts with a boot option with a ? mark in place of win xp .If I click on that it gives me a "NTLDR missing " msg. I tried connecting CAT5 cable between old and new pc and tried connecting my laptop with USB cable but nothing happend and then I realozed the modem doesnt have a WORKING usb driver for LINUX :( .FCUK ! .Freebsd doesnt` even detect the LAN cable if I use it for old pc . So basically I have a old pc that has FREEBSD which I can olny start and stare at the blank terminal console but works perfectly otherwise .FREEBSD was supposed to detect the LAN cable ??.And I have a laptop that has LINUX which only works if I connect it with a CAT5 cable .wtf . So what can I do with my old pc ??? any local server (if possible :( ) or some such thing ? or can u suggest any use .Im 18 and im into learning programming , coding .So I can practice it .Thankx !

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• hyper-v cluster behavior when losing network connectivity

  - by ChristopheD

  Setup: (rather new) Hyper-V R2 cluster with 2 nodes (in failover configuration). Fysical host OS: Windows Server 2008. About eight VM's (mixed: Windows Server 2008 and Linux) Yesterday we had a power outage of about 15 minutes. Our blades are on UPS so the fysical host machines (Windows Server 2008) never went down. Our main switches are not on UPS (yet) and we saw the behaviour similar to the following (as distilled from the event logs). The nodes in the cluster lost means of communication (because the external switches went down). The cluster wants to bring down one (the first) of the nodes (to start failover?). The previous step impacts clustered storage where the virtual machine VHD's are located. All VM's got brutally terminated and were found in a failed state in the failover manager in the host OS'es. The Linux VM's were kernel panicking and looked like they had their disk ripped out. This whole setup is rather new to us, so we are still learning about this. The question: We are putting switches on UPS soon but were wondering if the above is expected behavior (seems rather fragile) or if there are obvious improvements configuration-wise to handle such scenario's ? I can upload an evtx file concerning what exactly was going on in case that's necessary.

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• Ways to parse NCSA combined based log files

  - by Kyle

  I've done a bit of site: searching with Google on Server Fault, Super User and Stack Overflow. I also checked non site specific results and and didn't really see a question like this, so here goes... I did spot this question, related to grep and awk which has some great knowledge but I don't feel the text qualification challenge was addressed. This question also broadens the scope to any platform and any program. I've got squid or apache logs based on the NCSA combined format. When I say based, meaning the first n col's in the file are per NCSA combined standards, there might be more col's with custom stuff. Here is an example line from a squid combined log: 1.1.1.1 - - [11/Dec/2010:03:41:46 -0500] "GET http://yourdomain.com:8080/en/some-page.html HTTP/1.1" 200 2142 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.1; C) AppleWebKit/532.4 (KHTML, like Gecko)" TCP_MEM_HIT:NONE I'd like to be able to parse n logs and output specific columns, for sorting, counting, finding unique values etc The main challenge and what makes it a little tricky and also why I feel this question hasn't yet been asked or answered, is the text qualification conundrum. When I spotted asql from the grep/awk question, I was very excited but then realised that it didn't support combined out of the box, something I'll look at extending I guess. Looking forward to answers, and learning new stuff! Answers doesn't have to be limited to platform or program/language. For the context of this question, the platforms I use the most are Linux or OSX. Cheers

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• Unable to make the session state request to the session state server.

  - by Angry_IT_Guru

  For about 4-5 months now, I seem to be having this sporadic issue--mainly during our busiest time of the day between 10:30-11:45AM, where all my Windows 2003 web servers in a Microsoft NLB cluster start throwing session state server errors. A sample error is below. System.Web.HttpException: Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection. If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name. at System.Web.SessionState.OutOfProcSessionStateStore.MakeRequest(StateProtocolVerb verb, String id, StateProtocolExclusive exclusiveAccess, Int32 extraFlags, Int32 timeout, Int32 lockCookie, Byte[] buf, Int32 cb, Int32 networkTimeout, SessionNDMakeRequestResults& results) at System.Web.SessionState.OutOfProcSessionStateStore.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem) at System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) Now I'm using ASP.NET State service on a centralized back-end Windows 2003 server that all servers communicate to. I was originally using SQL Server state for a couple years as well prior to having this issue. The problem with SQL wqas that when the issue occurred, it created a blocking situation which essentially impacted all users across all servers. The product company recommended that I use the standard ASP.NET State service as that was what they technically supported. Why this would make a difference is beyond me -- but I had no choice but to try it! I have attempted to create multiple application pools, adding additional servers, chaning TCP/IP timeout from 20 to 30 seconds, and even calling Microsoft ASP.NET product support, with very little success. I even recommended that they review whether they are using read-only session state instead of read/write per page request -- as I understand that this basically causes every page to make round-trips to state server even if state isn't being used on the page. Unfortunately, the application is developed by our product company and they insist that it is something with my environment because other clients do not have these sort of issues. However, I've talked to other clients and they tell me when they've seen issues like they, they've basically had to create another web farm. This issue almost seems like I've simply reached some architectural limit within the application... Microsoft's position on the issue is that the session state needs to be reduced and the returncode being reported back from the state server indicates buffers are full. To better understand the scope of issues (rather than wait for customers to call and complain), I installed ELMAH and configured it to send me e-mails when unhandled exceptions occur. I basically get 500-1000 e-mails during the time period of high activity! If any one has any other ideas I could try or better ways to troubleshoot, I'd appreciate it.

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• proxy pass domain FROM default apache port 80 TO nginx on another port

  - by user10580

  Im still learning server things so hope the title is descriptive enough. Basically i have sub.domain.com that i want to run on nginx at port 8090. I want to leave apache alone and have it catch all default traffic at port 80. so i am trying something with a virtual name host to proxy pass to sub.domain.com:8090, nothing working yet and go no idea what the right syntax could be. any ideas? most of what i found was to pass TO apache FROM nginx, but i want to the do the opposite. LoadModule proxy_module modules/mod_proxy.so LoadModule proxy_http_module modules/mod_proxy_http.so <VirtualHost sub.domain.com:80> ProxyPreserveHost On ProxyRequests Off ServerName sub.domain.com DocumentRoot /home/app/public ServerAlias sub.domain.com proxyPass / http://appname:8090/ (also tried localhost and sub.domain.com) ProxyPassReverse / http://appname:8090/ </VirtualHost> when i do this i get [warn] module proxy_module is already loaded, skippin [warn] module proxy_http_module is already loaded, skipping [error] (EAI 2)Name or service not known: Could not resolve host name sub.domain.com -- ignoring! and yes, the app is working (i have it running on port 80 with another subdomain) and it works at sub.domain.com:8090

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• What can be done to improve time synchronization on networks with sporadic internet access?

  - by anregen

  I'm looking for advice setting up time servers for a very non-typical network. I support many closed networks that have occasional access to the internet. A network would get access most days for a few hours, but would frequently go 1-3 weeks blacked-out. The computers/servers on this network are mostly *nix-based, but not all the same flavor. The entire network is mobile, so when it connects, it will have very different hops/latency to internet time servers. The servers on the closed network are powered-off frequently (at least daily). Right now, my gut tells me to use NTP (because I hate re-learning all the stuff that someone else already got working pretty well). But I have several issues, and am looking for someone with experience in this type of strange situation. I currently have no solution in place, I'm simply letting the internal clocks drift. This results in errors of ~600s in a majority of networks. I have seen mismatch worse than 10,000s. Is there something "better" than NTP in this situation? I know NTP likes to have very frequent, consistent access to servers that give nearly identical answers. I won't have that. How many internal NTP servers should I configure, so that during periods of internet blackout, I have internal time that is consistent within the closed network? There is no human access. No matter how large the mismatch, the server(s) must attempt to correct itself. Discrete steps are very bad. No matter how large the mismatch, the correction must be "slewed", not "stepped". I understand that this could take many hours to correct.

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• Can I regenerate the rsa key for SSH access to a Cisco router? Or should I completely erase the SSH config?

  - by Josh

  I have a production 2691 that I administer via telnet. I'd like to change that to SSH. Looking at the config, it looks like there have been keys generated in the past. I think the history here is SSH was set up, they had issues connecting, and fell back to telnet. There are a number of crypto entries, including the following: crypto pki trustpoint Gateway-2691.xxx.com enrollment selfsigned subject-name cn=IOS-Gateway-2691.xxx.com revocation-check none rsakeypair Gateway-2691.xxx.com I've also got this going... Gateway-2691#sh ip ssh SSH Disabled - version 1.99 %Please create RSA keys (of atleast 768 bits size) to enable SSH v2. Authentication timeout: 120 secs; Authentication retries: 3 Gateway-2691# My question is simply, can I run crypto key generate rsa again to set it up again? Is there a way to negate or no all of the previous ssh config so that I can start fresh there? I may be asking the wrong questions, as I'm learning here. As for the SSH how-to, I'm sure I can find information in many places. I'm just basically wondering if I need to start fresh, or if I can pick up where the last attempt at SSH config left off.

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