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• MRTG + RRDTool Hourly Graph

  - by SuperMicro321

  I am using MRTG + RRDtool to monitor the bandwidth on each switchport of a Cisco Catalyst 2950 via snmp. Is MRTG capable of generating an hourly graph? With RRDtool I was able to set the interval to 1 minute in hopes of getting a more detailed graph, but the shortest timeframe the graph is 'Daily' graph (5 Minute Average) and the image is too small. What I am looking to get out of this: I am looking to be able to visually monitor all of the switch ports and tell when port begins to have unusually high traffic, in real time (1 minute interval of snmp poll, graphs generated, and page refreshed).

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• Where can I find a tutorial for PCB?

  - by BCS

  I'm looking at using this PCB layout program and looking for a tutorial for it. After skimming through the manual, and a few attempts at guessing how to use it, I have to say that in combination they are a near ideal example of how Not to make a UI easy to use. The GUI seems to borrow it's key combinations from vi (despite not being a text editor) and the manual seems to say more about what things do than how to do things. The closest I can find is this section that starts with the todo note: [...] do a real-world tutorial example.

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• Architecture behind live streaming [on hold]

  - by l19

  I'm a Comp Sci undergraduate student, and I'm currently trying to understand the architecture behind streaming. I hear several terms and I'm not quite sure how they are related (e.g. streaming, broadcasting, ingesting, etc.) Is there a blog post or book that explains: How it all works in a high-level view (the workflow) The architecture (i.e. I capture content using my camera and want to display it real-time to an audience. I imagine that the content will be transferred to a server, but how does that server transmit the information to several users simultaneously?) Thanks!

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• Original sender is not correctly identified when spam is forwarded

  - by Stephan Burlot

  I have a forwarding rule with Postfix that forwards all messages to my main email address. When a spam message is sent to one of my emails, it is forwarded but the sender is shown as being the forwarding domain, not the spammer's domain. Real example: mywebsite.com is hosted on Linode. [email protected] sends an email to [email protected] the mail is forwarded to [email protected] my email hosting (anotherwebsite.com) sees it's spam and sends a message to [email protected] and Linode reports a TOS violation. I have modified my postfix settings so I now use RBL, but if a message goes through, it may happen again. How can I prevent this to happen again? Is there some settings to change on Postfix so the original sender is correctly identified? Thanks Stephan EDIT: The steps I did to prevent this to happen again are: Add RBL checking to Postfix Add postgrey to Postfix And finally fix the MX record which was incorrect. I checked with a test email on Spamcop.net and the original sender is correctly identified.

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• write-through RAM disk, or massive caching of file system?

  - by Will

  I have a program that is very heavily hitting the file system, reading and writing randomly to a set of working files. The files total several gigabytes in size, but I can spare the RAM to keep them all mostly in memory. The machines this program runs on are typically Ubuntu Linux boxes. Is there a way to configure the file system to have a very very large cache, and even to cache writes so they hit the disk later? I understand the issues with power loss or such, and am prepared to accept that. Crashing aside, in normal operation the writes should eventually reach the disk! Or is there a way to create a RAM disk that writes-through to real disk?

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• what is the differences between (libapache2-mod-php5 ) and ( libapache2-mod-php5filter)

  - by tawfekov

  i had noticed that some code doesn't play nice when i use libapache2-mod-filter while it working as expected in libapache2-mod-php5 the error was generated by doctrine + it's very simple like : $db = new self(); $db["name"] = $name; $db["desc"] = $desc; $db->save(); /// it throw the error here error message like : Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'desc) VALUES ('aaaaaaaaaaa', 'aaaaaaaaaaaa')' at line 1 so what is the real difference between the both modules for php5 ???

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• Linux Software RAID: How to fsck on hard drive?

  - by Rick-Rainer Ludwig

  We have a Linux server running with Software RAID1. We see some issues in /var/log/messages like: unreadable sector. I want to perform a complete fsck on the drive to get some more information, but a fsck /dev/md0 brings a clean due to the Software RAID layer in between. How can I check the real hard drive? Do I need to disassemble the whole RAID? How do I deal with the inconsistency in the partition due to the additional Software RAID header? Does anyone have a good idea for this?

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• How to switch users without entering password

  - by torbengb

  I'm a newbie running Ubuntu 9.10. I have two users (wife and me), and each user's screensaver is set to lock so that on wakeup, we get to choose which user's desktop to go to. However, Ubuntu requires a password, so this is pretty tedious. I'd like to switch users without entering any password. I know about this trick that works for the boot login, but it doesn't deal with multiple users. Is it possible to set empty passwords for users in Ubuntu, or skip the password in other ways? (I'm expecting real Linux users to suggest that passwordless users must not get any rights and there be an admin user with a strong password. Yes, you're right. But that's not what this question is about. Thanks.)

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• 5v PCI to PCI-X or PCIe adapter?

  - by SiegeX

  We unfortunately have a very expensive ($10K) full-length 5 volt PCI card that we would like to use in the same system as another expensive PCI-X card. As luck would have it, it seems that PCI-X is not backwards compatible with 5v PCI cards. It would be a real shame to have to order a whole new server just to accommodate these two cards together. Does there exist any internal converter/adapter that will allow one to place a full-length 5v PCI card into either a PCI-X or PCIe slot? I've found an external expansion box that suits our needs but it's 1) External and 2) $1100. The only internal adapters I've been able to find go from Low-profile PCI - PCIe; nothing that seems to support full-height, full-length PCI cards.

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• How can I compact the VHD file with Ubuntu?

  - by AmShegar

  I use windows server 2008r2 with role Hyper-V. The guest system is Ubuntu 12.04 LTC. It is situated on the dynamic virtual hard disk. I want to compact this VHD (The real size is 50 GB, 360 GB on the disk). But I can not do this, because the Ubuntu file system is not NTFS. What do I need (gparted, sdelete, ...) for solving this problem? The main problem is that the filesystem is not NTFS, but ext4.

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• Nginx proxy cache (proxy_pass $request_uri;)

  - by imastar

  I need to create proxy web using nginx. If I access http://myweb.com/http://www.target.com/ the proxy_pass should be http://www.target.com/ Here is my configuration: location / { proxy_pass $request_uri; proxy_cache_methods GET; proxy_set_header Referer "$request_uri"; proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_ignore_headers Cache-Control; proxy_hide_header Pragma; proxy_hide_header Set-Cookie; proxy_set_header Cache-Control Public; proxy_cache cache; proxy_cache_valid 200 10h; proxy_cache_valid 301 302 1h; proxy_cache_valid any 1h; } Here is the log error 2013/02/05 12:58:51 [error] 2118#0: *8 invalid URL prefix in "/http://www.target.com/", client: 108.59.8.83, server: myweb.com, request: "HEAD /http://www.target.com/ HTTP/1.1", host: "myweb.com"

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• unique .htaccess question about mod_rewrite and RewriteCond

  - by Stephen

  I have a few rewrite rules like these RewriteRule ^dir/(.*)-something.html otherdir/file1.php?var1=val&var2=$1 [L,NC] RewriteRule ^dir/ otherdir/file2.php?var1=val [L,NC] dir/ is not a real directory. Everything above works as expected. However, the user is able to type anything like mysite.com/dir/asdfasdfasdfsdf And they are still redirected to file2.php. If the user types in just garbage I'd like to serve a 404 instead. I'm guessing I need a RewiteCond that will test for blank space after the slash and only then serve file2.php, but I'm unsure how to write it.

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• Where did this incorrect cached DNS lookup come from?

  - by Stephen Jennings

  Somehow, I've been having a chronic issue where my computer will get an invalid DNS lookup in its cache for either of the two Exchange servers I use from Mail.app. My workplace runs one of the Exchange servers and I run the other (they are totally unrelated, hosted by different companies, etc.). The problem manifests as a certificate domain error. When it happens, I can run nslookup mail.mydomain.com and I see the incorrect IP address (usually owned by either Apple or Akamai), but if I run nslookup mail.mydomain.com 8.8.8.8, I get the correct address. My real quest is to find out why this keeps happening, and to do that, I'd like to know which server is supplying me this bad DNS entry. Is there a way to check my DNS cache to see where this bad lookup came from?

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• installing plugins in vim

  - by Ying

  I had a real difficulty installing vim plugins on mac. I know for a plugin to be installed it has to be seen by runtimepath. According to vim docs, this is Macintosh: "$VIM:vimfiles, $VIMRUNTIME, $VIM:vimfiles:after" First off, what does $VIM:vimfiles mean?? It is certainly not $VIM/vimfiles, as (~/.vim/vimfiles) does not work. So my options are 1) put my plugin in /usr/share/vim/vim73 (my $VIMRUNTIME, which i know to be BAD) 2) find a way to make vim look at my home directory when including plugins. I have putting my plugin in: ~/.vim/plugin.vim ~/.vim/vimfiles/plugin.vim ~/.vim/plugin/plugin.vim All to no avail. Can somebody help me out here? Thanks!

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• [Ubuntu] How can i log-in to Ubuntu using USB-serial console (rs232) ?

  - by marc

  Welcome, How can enable remote terminal login into Ubuntu 9.10 using usb-serial terminal ? I got created device ttyUSB0 and i want allow to log-in using hyper-terminal. I found some resources but they are related to real! hardware rs232 ports, i can't find any information about USB converter. Right now i have established connection between that usb-serial port and my laptop (i can send text writing to port cp sometext.txt /dev/ttyUSB0 and read using hyperterminal). Any idea ? Regards

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• qtcreator keyboard problem: azerty/qwerty

  - by Allen

  I picked up the qt SDK and I've been trying it out. I'm working in English but I have a French AZERTY keyboard. When I run Qt Designer all is fine. When I run Qt Creator or Qt Designer from within Qt Creator things work as though I had a QWERTY keyboard, so I have to hit the "q" key to get an "a", etc. Qt Creator is version 1.3.1 and it is using Qt 4.6.2. My PC is running XP. What is going on and what is to be done? Any ideas? Editing a program in this setup is, of course, impossible! Luckily I discovered I can use an external editor, so I can use xemacs, which would be my first choice anyway, but this keyboard problem is a real nuisance! Thanks.

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• Getting live traffic/visitor analytics when using a reverse proxy

  - by jotto

  I'm in process of implementing Varnish as a reverse proxy for a Ruby on Rails app and I'm using Google Analytics (JS/client side script to record visitor data) but it's several hours delayed so its useless for knowing what's going on now. I need at a glance live data that includes referring traffic and what current req/sec is. Right now I am using a simple Rack middleware application to do the live stats (gist.github.com/235745) but if the majority of traffic hits Varnish, Rack will never be hit so this won't work. The closest solution I've found so far is http://www.reinvigorate.net/ but it's in beta (there are also no implementation details on their front page). Does Varnish have traffic logs that I can custom format to match my Apache logs so I can combine them, or will I have to roll my own JS implementation like GA that shows the data in real time?

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• Determining currently-serving files in IIS 7

  - by Nat Papovich

  serverfault showed me this topic, and I think I want to do the same thing, but in IIS, not Apache. I have a "dashboard" application I'm building and I want it to show what files are currently being served by IIS. They'll mostly all be large files. I believe that the ILogScripting COM Interface would have been one good place to start, but it's not available in IIS 7, and it relies on the underlying IIS logs for its data. And therein, I believe, lies my problem. How do I make IIS put in, essentially, two log entries, one as the request begins, and one when the connection is closed? Also, it looks like IIS doesn't "commit" log entries as they're occuring, in "real-time". There's some kind of delay/batch-job. That will cause a problem for me too. Or do I need to do something in isapi instead?

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• Slow old notebook Hardy => Karmic

  - by Mailo

  Hi, i have one very slow notebook from year about 2000. On the computer is running icewm with firefox (in this times chromium for testing). My question is if it's good step to upgrade the system to Karmic Koala? I can't install another OS on that. It doesn't have CD-ROM, it can't boot from flash, or network. The new wanted state is little bit faster system for browsing web and copying photos to local NAS. I don't mention hardware configuration, becouse it's real speed is really deep below the paper parameters.

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• Virtual machine on ubuntu

  - by MITHIYA MOIZ

  I have configured virtual machine on ubuntu with the help of below article, https://help.ubuntu.com/9.04/serverguide/C/libvirt.html I managed to finish all the part except the major portion getting virtual host to talk to real network, Which I guess should be done only via bridge interface. Via virtual machine manager I try to choose any interface it gives me interface not bridged When I try to bridge the interceface eth0 as below auto br0 iface br0 inet static address 192.168.0.223 network 192.168.0.0 netmask 255.255.255.0 broadcast 192.168.0.255 gateway 192.168.0.1 bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off I cannot communicate with this interface to network, host server looses all the communication to network. But when I remote bridge interface from /etc/network/interfaces And configure eth0 as below it works fine The primary network interface auto eth0 iface eth0 inet static address 192.168.0.223 netmask 255.255.255.0 network 192.168.0.0 broadcast 192.168.0.255 dns-nameservers 62.215.6.51 gateway 192.168.0.1 how can i setup bridge interface correctly and how would my /etc/netwrok/interfaces file would look a like.

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• Why should I -minus flags of eselect profile? [closed]

  - by Xsi

  Why not just disable profile and add + + + , and thats it? Rationale. Could I ask ??? second question: where is there a short YES\NO Questions & Answers service? My questions were a subject to closing and deletion at Unix&Linux (as they were not real - we know perfectly admins can't answer and think to help others), but they were long forming in my head, since I'm a very novice user to Linux. My questions were some of that size and were from my point, all-specific, they were not fault ones, but knowledge q's (not to fault), although some not banned questions of others are as short as a line (U&L).

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• Configure IIS to rewrite IP Address to Site Name

  - by Bath Man

  So i've started my first web site from home, and I'm trying to get it up and running and google crawlable and the like, but I can't seem to figure out how to have my site name returned in the address bar instead of my IP address. I've purchased a domain name for my site on Godaddy and then set it to redirect to my site. When you type in the domain name, you get redirected to http://0.0.0.0/default.aspx (not my real IP obviously), and that stays in the user's address bar. In order to fix that temporarily, I've set up masking on Go Daddy which keeps the URL in the address bar, but just shows my website in a frame. This is fine for users visiting the site, however any kind of automated robot such as GoogleBot cannot discover my content because of the frame. I've looked into ISAPI filters and server-site-rewriting, and the like... but I just can't quite figure out how to do what I need it to do. Any simple suggestions or links would be appreciated.

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• HOWTO Catch/Redirect all outgoing e-mails on Win2K and Redhat Enterprise

  - by John

  Background: I am integrating two separate web application that are developed in ASP .NET and JSP/Struts. As such, they are hosted on two different server technologies, namely Win2K3 and Redhat Enterprise Server 5.5. Problem: There is a copy of production data in my test environment with real e-mail addresses. I need to test the e-mail functionality of these applications, but I do not want them to send out actual e-mails. Is there a way to catch and redirect all outgoing e-mails? Ideally, I would like to send all outgoing e-mails to another e-mail (i.e., [email protected]) so my testers can look at them. Thanks for the help in advance!

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• How to remove IMAP account from Thunderbird's "Grouped Inbox"

  - by Pekka

  I have four IMAP accounts "merged" into one using Thunderbird 2's "Grouped inbox" view. I want to take one of the four accounts out of the grouped view. It is a maintenance mailbox that contains a lot of status mails. Those mails tend to clog my "real" inbox. I am able to edit the Inbox folder using "Properties". In the list that comes up, it is possible to de-select the maintenance mailbox and everything works fine. However, if I restart Thunderbird, it will forget what I de-selected and use all four mailboxes again. Is there any way to make Thunderbird remember the change?

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• MS-DOSdivide overflow

  - by repozitor

  when i want to install my dear application on MS-DOS os, i see error "Divide Overflow" what is the meaning of this error and how to fix it? the procedure of installing is: 1-partitioing my HDD disk 2-format C drive 3-installing MS-DOS 4-add the flowing lines to config.sys "DEVICE=C:\DOS\HIMEM.SYS DEVICE=C:\DOS\EMM386.EXE RAM DEVICE=C:\DOS\RAMDRIVE.SYS 6000 512 64 /e" 5-insert my floppy application and then restart 6-when boot process completed, all of the thing appear correctly and i now how to do the next steps note:for installing my application i need to boot from floppy app when i have ms-dos on my hdd disk i do it successfully on the Virtual machine, Q emulator but i can't do it on the real machine, Vectra HP PC, because of divide overflow

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