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• CLI-Based monitoring tool for KVM

  - by Pinnacle

  I am developing a scheduler for running VMs on KVM. The scheduling has over-commitment of resources like memory and CPU. For this, I need a CLI-based monitoring tool that keeps me giving information about the resource usage of each VM, because it might be the case that due to over-provisioning of resources, VMs on a particular host are running very slowly depending on the benchmarks/programs each VM is running, and then I need to migrate a VM to another host and so on. I looked into libvirt-based tools like collects, MUNIN, Nagios-vert, etc.( http://libvirt.org/apps.html#monitoring ) I also looked into Ubuntu utility perf-kvm ( http://manpages.ubuntu.com/manpages/maverick/man1/perf-kvm.1.html ) I want to ask which CLI-based would be recommended by the community so that I can make a automated scheduler that takes care of the above situation.

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• Linux servers seeing bad download performance behind Sonicwall firewall

  - by Joshua Penix

  I'm working with a pair of co-located CentOS Linux servers sitting behind a Sonicwall PRO 2040 Enhanced firewall running in transparent bridge mode. These servers are having a strange problem downloading files more than a few megabytes in size. For example, if I try to wget or FTP a copy of the Linux kernel from kernel.org, the first ~1-2MB will download at 600+K/s, and then throughput will drop off a cliff to 1K/s. I've reviewed all the firewall configuration settings for anything suspicious, but found nothing. More interestingly, I performed the same download with a Windows server sitting behind the same firewall, and it sailed right through at 600+K/s the whole way. Has anyone seen this? Where should I start looking to troubleshoot this problem?

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• Attach certificate to remote desktop connection - not gateway services

  - by Jordan S

  I have a Windows server that I want to attach a 3rd party signed certificate for remote desktop connections. This is not a remote desktop services server, i.e. it is just remote desktop administration. There is lots of info on the internet about attaching a certificate to remote desktop services, but I want to attach mine to just plain remote desktop connection for administration purposes. If anyone know how to do this, please holler! I have imported the certificate into the Remote Desktop store in the certificates mmc snap in, and have tried running the wmic command in this question (Configure custom SSL certificate for RDP on Windows Server 2012 in Remote Administration mode?) but this fails. THANKS!

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• How to make a vm scale when demand for resource increases

  - by Cray XT3

  i am having a server with 16 virtual core and 24G RAM,using Xen virtualization and ubuntu as dom0 Created 4 VMs (in para mode),each with different applications. CPU Load vary on each vm,somtimes first vm reaches nearly 100% CPU and others under 25% or even less. So is there a way in which vm can get cpu from other vms when they are not actually using it or utilization is under 25%.Same in the case of RAM also. I am not sure whether i am mentioning Cloud here. Initially i would like to give every vm a single VCPU,but can scale up to 8 or more by taking cpu from other vms if they are not using it. Is there any kind of tool that makes vm to scale its resources when demand increases. Is cloudstack and openstack designed for these kind of purpose or is that just a GUI to manage VMs.

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• bind: blackhole for invalid recursive queries?

  - by Udo G

  I have a name server that's publicly accessible since it is the authoritative name server for a couple of domains. Currently the server is flooded with faked type ANY requests for isc.org, ripe.net and similar (that's a known distributed DoS attack). The server runs BIND and has allow-recursion set to my LAN so that these requests are rejected. In such cases the server responds just with authority and additional sections referring the root servers. Can I configure BIND so that it completely ignores these requests, without sending a response at all?

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• What would you use to keep track of all the random information about your LAN/Enviroment?

  - by agnul

  Say you work in your average anarchy... no appointed IT guy, no Office-Manager whatsoever, just developers working in free-for-all mode and a couple of non technical people around for admin (non IT) stuff. What would you use to keep track of Hardware / Software inventory Backups of OS images, Drivers, and all that LAN configuration information Passwords for all the systems Currently I'm thinking of having some sort of wiki + web server on our only ''server-class'' machine, but then I fear I'd be the only one who would go through the hassle of adding information in the wiki... So, have you been through that? What would you suggest?

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• ldirectord refusing connection when nginx redirects from http to https

  - by Adam

  I am running ldirector as a load balancer to an nginx front end server. If I setup a redirect from http to https and connect directly to the nginx server, all is well. Connecting via ldirector causes my connection to be refused. I can connect normally via http or https through ldirector when I don't have the redirect in place. To add to my confusion, if my application issues a redirect from http to https, it works. I am testing this via curl on the command line. (curl: (7) couldn't connect to host vs a response) I am using the standard ldirectord config (http://www.ultramonkey.org/3/topologies/config/lb/non-fwmark/linux-director/ldirectord.cf) the http and https parts. My nginx config for the redirect is simply: location / { rewrite ^(.*) https://$host$1 permanent; }

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• PC boots on then off & 30 sec. later on again, it wiil shut off on itself mostly in idle or just unexpecticly

  - by Jody

  This problem started w/ my sons desktop, it would just shut off after a bit of work or stay on for a long time & to get it to unfreeze is to cold boot it, i put a new HDD in & I still have the same issue, RAM is good power supply fan is moving quite as well as all the rest of the fans it has stayed fairly dust free, i'm at a loss ,I have defaulted all the factory settings changed battery & ungraded to a new OS. I still have the same problem. the power light stays on after it has shut down & when upon starting it goes straight to safe mode option page, I start in last good config. reboots again takes 30 sec. to boot & will work again for a while, the only other thing I haven't tried was a graphic card replace, i'm onboard video now & have been.

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• Kill xserver from command line (init 3/5 does not work)

  - by John Smith

  Hi, I'm running Linux Mint 10, although I've had this same issue with other variants of Linux. I've been told/found while researching that if the X server hangs or otherwise errors, one can drop to a root prompt, usually at another tty, and execute init 3 (to drop to single user mode) and then init 5 to return to the default, graphical session. Needless to say, I've tried this before in multiple configurations on multiple machines to no avail. The only feedback I receive form executing those two commands is a listing of VMWare services (from a kernel module) that are stopped and then restarted. Note: If I run startx (either before or after init 3), then I am told that the xserver is still running and that I should remove /tmp/.X0-lock. Having tried that, it removes that error message, but claims that the xserver cannot be attached as another instance is running. How do I kill the xserver completely? Can I killall some process name?

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• How to disable a McAfee service?

  - by AngryHacker

  I am trying to disable a McAfee Real-Time Protection service, but if I go into Services/Properties, then try to set it to Manual or Disable - it says that unable to open service McShield for writing on Local Computer. Error 5. Access is denied. I've tried logging in as an Admin, to no avail. I've tried resetting permissions in the registry to the key where the McAfee service is described...nothing helped. Logging in with Safe Mode did not help either. How can I disable this service? Is there a way to disable a service before even getting into Windows? P.S. Uninstalling McAfee is not an option.

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• How to open Firefox's "organize bookmarks" from Vimperator?

  - by Igor Popov

  Before using Vimperator, I used Xmarks for organizing and synchronizing bookmarks between computers. Now I installed Vimperator and I can only bookmark a page from command mode with :bmark. How can I open Organize Bookmarks with Vimperator? Besides disabling Vimperator and choosing it from the menu what else can I do? Before, I had CTRL + SHIFT + b to open the organizer. Now, in Vimperator, this shortcut doesn't work anymore, even after temporarily disabling Vimperator with CTRL + z. EDIT After setting the main menu visible (with :set go+=m thanks to Hamish Downer), I saw the shortcut for opening the organize bookmarks dialog (CTRL + SHIFT + o). I recently switched to Ubuntu Linux and in this version of Firefox some keyboard shortcuts are different then in Windows (including the shortcut for opening organize bookmarks). Sorry for my ignorance.

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• puppet restart service failure

  - by Roman

  help me please with service restart # changing iptables` file { "/etc/sysconfig/iptables": ensure => "present", content => template("all_in_one/iptables.erb"), owner => root, group => root, mode => 600, } service { "iptables": ensure => running, enable => true, hasstatus => true, hasrestart => true, subscribe => File["/etc/sysconfig/iptables"] } output is: err Failed to call refresh: Could not restart Service[iptables]: Execution of '/sbin/service iptables restart' returned 1

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• Switch 302 redirect to 301 with Apache 2 ProxyPass in front of Tomcat 6

  - by Gearóid

  I'm trying to optimise my site for SEO and it seems as though their is a 302 direct in action for the http requests. I'm hosting my app on a Tomcat 6 server which lies behind an Apache 2 server. I use the ProxyPass method (http://tomcat.apache.org/tomcat-6.0-doc/proxy-howto.html) to forward all requests to port 8080 (the port my app is hosted on). I've seen a lot of advice on how to set the redirect type when using the VirtualHost method but none to do with ProxyPass. The app is a Struts app that forwards users on to index.jsp when they hit the base url. Could this also be the issue? I'm grateful for any help on this one! Cheers!

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• How to solve my black screen at boot?

  - by Juanillo

  I've got a friend with a weird problem. When he starts his computer the screen is completely black until the computer is completely started. So the screen is black until it suddenly shows the Windows desktop. He said that this is happening since a technical service repaired his computer, but that repair is not now in warranty. Recently the computer stopped working, but as the screen is black he cannot access to BIOS or start in safe mode (by pressing F8). When he inserts the Windows Vista DVD the system doesn't boot from DVD (it mustn't be configured in this way in the BIOS). Maybe there´s a problem with the hardware (maybe the graphic card)? Can anyone explain a reason why the screen is black during start-up? Any idea of what to do with the computer to restore it?

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• Mysql Master-ColdMaster

  - by enedebe

  I explain my case: I'm at Amazon AWS and I want to be fault tolerant on a entire region failure. My basic problem is to have the db in sync with 2 regions. My options: Master-Master (high lag) Hand made sync every 5 minutes Master-ColdMaster?! (copy on the fly but Master won't wait the other region commit) In my system we could afford loosing a piece of data (we're not a bank) the last inserts in the db, but we could not afford more than 10 minutes of downtime. The database is small and the level of inserts is low, and I wouldn't affect the normal usage waiting other region commit. Is the 3 solution posible? And the most important, once the primary fail how we can detect and change the rol between master-coldmaster -- coldmaster-master ? Is there any clean-mode to restore between failure? Thank's!

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• System time wrong after running ntpdate because DST ignored

  - by Ian Dunn

  When I run ntpdate, my system clock displays the time as an hour behind what it should be. I know that ntpdate does everything in UTC, so I'm guessing there's a timezone setting wrong and it's ignoring Daylight Savings Time, but I can't figure it out. Here's what I've done so far: ln -sf /usr/share/zoneinfo/EST /etc/localtime to set the timezone Set UTC=true in /etc/sysconfig/clock so that DST will be automatically applied date -s hh:mm::ss to set system clock correctly hwclock -systohc --utc to set the hardware clock correctly At this point date and hwclock both display the correct time. But if I then run ntpdate 0.us.pool.ntp.org, the date output is an hour behind what it should be. I've looked at a dozen tutorials and can't figure out what I'm doing wrong. Does anyone have any ideas?

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• iPod Touch 2g not recognised by iTunes (more information inside)

  - by Jason

  My iPod Touch isn't being recognised by iTunes. Details: iPod Touch: 2nd generation / Laptop: Windows Vista / iTunes: latest version I have tried: using different cables; restarted my laptop and iPod. reinstalled iTunes. restarting services that were made by Apple; putting my iPod into restore mode; resetting my iPod; and still no luck getting it to be recognised by iTunes. This iPod works on other computers, and different iPod's work on my laptop. When I stopped all of the Apple services on my laptop, I got a message from iTunes when I connected my iPod saying that I needed to enable the services for it to work. But when I did enable the services again, the iPod still didn't show up on iTunes. I can't think what else I can do to solve the problem. Any ideas? Thank you very much in advance!

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• Will disabling NAT on my wireless router cause a performance hit on my DSL router?

  - by user117313

  I have a Thomson TG508v2 router/modem and a brand new AirPort Extreme connected to it. At first, I set the AirPort Extreme to "share a public IP", which enables DHCP/NAT. Everything works great but I was having the Double NAT error. So I set the AirPort Extreme as bridge mode, which disables DHCP/NAT and let my crappy modem handle my internal network IPs. Will this cause any performance hit in my network? I'm worried because I'll outsource this job from AirPort Extreme (premium hardware) to the crappy modem. Before you suggest, I tried setting my modem as a bridge and configuring PPPoE on the AirPort Extreme, however it wouldn't connect to the internet, so I just dismissed leaving the modem as bridge.

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• DSL-504T as dumb ADSL modem

  - by petebob796

  I am trying to setup an existing DSL-504T ADSL router to work as a dumb modem for a DIR-825 wifi router. I am assuming I should try and move as much of the control to the DIR-825 as possible. It's a PPPoA connection so I don't think I can use bridge mode. Does anyone have any guidance on this? Should I have 2 subnets? Should I set the DIR-825 as the DMZ on the DSL-504T? Do I need to keep NAT and firewall enabled on DSL-504T? Basically I have it working but want to know if I have set it up correctly as I really want the QoS to work on the DIR-825.

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• How to identify cause of system lock on debian squeeze?

  - by David Sanders

  I have a desktop system at work with debian squeeze installed. Every couple days or so, when I come in in the morning, the system appears to be asleep and won't wake up. I suspect it goes into power save mode and then doesn't receive the wake up signal when I click the mouse or touch the keyboard. Does anyone know where I should look in order to start tracking this down? Like log files, etc? I doubt it, but maybe the fact that I'm using a mac aluminum usb keyboard and a wireless usb mouse (that has an off switch) has something to do with it? Maybe, when I turn my mouse off at the end of the day, the system loses track of the device somehow? I dunno :P. Thanks in advance.

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• How to get back-to-work with a Windows 7 PC that has no admin account?

  - by Nam Gi VU

  Hi everyone, I have a PC which doesn't have the Administrator account active and the only user account left is a Guest user. I want to get back the admin account but I don't know how to do that with a guest user. I have tried searching the internet and try to use the Recovery Mode but adding/activating the admin account from DOS not working for me at all. Please help if you meet & solve it before! Thank you, Nam. ps. You can see my diigo try on solving this problem.

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• Moving a Drupal between linux servers, best practice to avoid file-ownership problems

  - by zero

  I want to port over a Drupal commons 6x24 from a local LAMP-stack to a production webserver. Both systems run OpenSuse Linux. How do I do this, what are the most important steps. How should I handle file-ownership. It's important for me to have to have full control of the file ownership. If I use the wwwrun account, I frequently run into problems, due to a very strict webserver-admin. See for example the long history of looking for fixes and solutions see this thread and even more interesting see this very long and impressive thread here. All troubles I run into have to do with file-owernship and permissions. This is my current setup; Note: This was just a quick hacked installation - quick and dirty. Well my interest is after the general options i have in the port of a drupal from linux to linux linux-vi17:/srv/www/htdocs/com624 # ls -l insgesamt 224 -rwxrwxrwx 1 root www 45285 19. Jan 00:54 CHANGELOG.txt -rwxrwxrwx 1 root www 925 19. Jan 00:54 COPYRIGHT.txt -rwxrwxrwx 1 root www 206 19. Jan 00:54 cron.php drwxrwxrwx 2 root www 4096 19. Jan 00:54 includes -rwxrwxrwx 1 root www 923 19. Jan 00:54 index.php -rwxrwxrwx 1 root www 1244 19. Jan 00:54 INSTALL.mysql.txt -rwxrwxrwx 1 root www 1011 19. Jan 00:54 INSTALL.pgsql.txt -rwxrwxrwx 1 root www 47073 19. Jan 00:54 install.php -rwxrwxrwx 1 root www 15572 19. Jan 00:54 INSTALL.txt -rwxrwxrwx 1 root www 14940 19. Jan 00:54 LICENSE.txt -rwxrwxrwx 1 root www 1858 19. Jan 00:54 MAINTAINERS.txt drwxrwxrwx 3 root www 4096 19. Jan 00:54 misc drwxrwxrwx 35 root www 4096 19. Jan 00:54 modules drwxrwxrwx 4 root www 4096 19. Jan 00:54 profiles -rwxrwxrwx 1 root www 1470 19. Jan 00:54 robots.txt drwxrwxrwx 2 root www 4096 19. Jan 00:54 scripts drwxrwxrwx 4 root www 4096 19. Jan 00:54 sites drwxrwxrwx 7 root www 4096 19. Jan 00:54 themes -rwxrwxrwx 1 root www 26250 19. Jan 00:54 update.php -rwxrwxrwx 1 root www 4864 19. Jan 00:54 UPGRADE.txt -rwxrwxrwx 1 root www 294 19. Jan 00:54 xmlrpc.php linux-vi17:/srv/www/htdocs/com624 # thx to BetaRides answer here a quick overview on the drush functionality with rsync http://drush.ws/ core-rsync Rsync the Drupal tree to/from another server using ssh. Examples: drush rsync @dev @stage Rsync Drupal root from dev to stage (one of which must be local). drush rsync ./ @stage:%files/img Rsync all files in the current directory to the 'img' directory in the file storage folder on stage. Arguments: source May be rsync path or site alias. See rsync documentation and example.aliases.drushrc.php. destination May be rsync path or site alias. See rsync documentation and example.aliases.drushrc.php. Options: --mode The unary flags to pass to rsync; --mode=rultz implies rsync -rultz. Default is -az. --RSYNC-FLAG Most rsync flags passed to drush sync will be passed on to rsync. See rsync documentation. --exclude-conf Excludes settings.php from being rsynced. Default. --include-conf Allow settings.php to be rsynced --exclude-files Exclude the files directory. --exclude-sites Exclude all directories in "sites/" except for "sites/all". --exclude-other-sites Exclude all directories in "sites/" except for "sites/all" and the site directory for the site being synced. Note: if the site directory is different between the source and destination, use --exclude-sites followed by "drush rsync @from:%site @to:%site" --exclude-paths List of paths to exclude, seperated by : (Unix-based systems) or ; (Windows). --include-paths List of paths to include, seperated by : (Unix-based systems) or ; (Windows). Topics: docs-aliases Site aliases overview with examples Aliases: rsync

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• Forwarding 80 to 443 on Nagios woes

  - by Ethabelle

  I perhaps just need some extra insight because I don't see where I'm going wrong. I used an SSL Cert to secure our nagios server. We want to specifically require all traffic over nagios (like 2 users, lol) to use SSL. So I thought, oh, mod_rewrite + Rewrite Rule in .htaccess, right? So I went into the DocumentRoot and did a vi .htaccess (one didn't already exist) and then I put in the following rule; RewriteEngine On RewriteCond %{SERVER_PORT} 80 RewriteRule ^(.*)$ https://our.server.org/$1 [R,L] This does absolutely nothing. Does nada. Whhhyy.. Note: AllowOverride all in httpd.conf is on. Also, I verified that the module is not uncommented out ... but note, I couldn't find the mod_rewrite module installed so I copied it over from another server and placed it in modules/mod_rewrite.so . It was weird because it was enabled in the httpd.conf file, but then didn't exist in modules ... I'm a baddie :(

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• SQL Management Studio is painfully slow on 32-bit Windows 7

  - by Sergei

  I've been having issues running anything in SQL Management Studio on Win 7. Basically, doing anything through the Management Studio interfaces completely freezes it up for a few minutes. Running a query is nearly impossible because it takes nearly 2 minutes just for the IDE to parse it and another minute to run it when the query itself completes instantaneously outside of the IDE. I'm not even going to go into the query designer. Anything with heavy user interaction such as editing a row in the result set where i have to click a cell freezes up the front-end. I tried reinstalling to no avail. Also tried running in compatibility mode without any difference whatsoever. Anybody had a similar experience? I'm running SQL Management Studio 2008 version 10.0.2531.0 on 32-bit Windows 7. Connecting to a remote SQL Server instance (2008 R2). Thanks.

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• How can I attach RAWs to already imported JPEGs in Aperture

  - by Sascha Vogt

  I shoot photos in RAW+JPEG mode since I got my DSLR. In the beginning I only used the JPEGs but lately I'm using RAW more and more. Unfortunately I imported only JPEGs in my first projects in Aperture. I already tagged, starred and cropped a lot of images and don't want to loose these information. But I would now like to "add" the RAWs to the old masters, so I can do more editing on these images. I didn't find any way to create a RAW+JPEG original in Aperture other than importing as such right in the beginning. Can anyone help? Greetings -Sascha-

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