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Articles indexed Saturday November 3 2012

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• Slave/secondary DNS nameserver

  - by user114671

  I'm learning about DNS and have a very basic, generic question about DNS but I can't find an answer anywhere. I have DNS for a few domains set up as follows: - master records with DNS company A - slave records with DNS company B Company A's nameservers are: ns1.companyA.com. ns2.companyA.com. ns3.companyA.com. ns4.companyA.com. ns5.companyA.com. and company B has three slaves: ns6.companyB.com. ns7.companyB.com. ns8.companyB.com. Everything works fine transferring the records between the nameservers and keeping them in sync. But my question is: The registrar of my domain example.com allows me to choose 4 nameservers only. Do I just pick the first 4 for company A, or do I need to include 1 or more of company B's slave nameservers too?

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• ActiveMQ Configuration with KahaDB

  - by xeraa

  We are using ActiveMQ 5.6.0 with KahaDB. It has produced quite some log files, which is to be expected with our infrastructure, looking like this: $ ll -h /opt/activemq/data/kahadb/ total 969M drwxr-xr-x 2 root root 4.0K Nov 3 12:47 ./ drwxr-xr-x 3 activemq activemq 4.0K Sep 24 12:12 ../ -rw-r--r-- 1 root root 39M Oct 16 07:57 db-202.log -rw-r--r-- 1 root root 38M Oct 16 07:57 db-203.log -rw-r--r-- 1 root root 33M Oct 17 08:12 db-238.log ... No more messages were processed, when we ran into the 1GB temp usage limit. Or that's what we are assuming, is that correct? The configuration looks like this: <systemUsage> <systemUsage> <memoryUsage> <memoryUsage limit="512mb"/> </memoryUsage> <storeUsage> <storeUsage limit="3 gb"/> </storeUsage> <tempUsage> <tempUsage limit="1 gb"/> </tempUsage> </systemUsage> </systemUsage> After cleaning up the log files and being way below the limits, still no messages were consumed by AMQ. Only when we manually purged a route, messages were starting to be delivered again. So we need to ensure, that the KahaDB log size always stays below the temp usage, right? And that delivery was not picked up after fixing that is a bug or are there any other steps to be taken?

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• LAN Webserver not accessible through PPTP VPN

  - by Joe

  I have this LAN Network with 10 clients and one server. The server has 4 virtual machines and a BIND DNS Server. When the router assigns an IP through the DHCP , it also gives the ip of the DNS Server, to resolve internal domains. Everything apparently works fine, the clients being able to access the server's vm's resources, but I also have to create the possibility of remote access. I installed the PPTP VPN on the server, and the vpn clients would get the same ip address range as the router's dhcp is assigning. Apparently everything is fine here also, except the fact that when we connect through the vpn , we cannot access the webserver on port 80 ( the webserver being one of the server's VM ). The iptables on the webserver has been turned off for testing purposes and the router's firewall is directing all the external traffic to the server. Can somebody suggest a solution to this? Extra details : VPN Server : PPTP Server Centos 6.3 x64 VPN Client : Windows 7 default PPTP VPN Connection The client is successfully connected to the server, everything works ( FTP/MYSQL/SSH/DNS ) , except the fact that when I try to access the webserver IP on the browser, it won't work.Pinging it works perfectly.

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• Debian Wheezy (testing) df reported volume size

  - by TheRoadrunner

  I am a bit confused about the /dev/sda* references since I installed Wheezy instead of Squeeze on a testing box. fdisk -l returns: Disk /dev/sda: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000e9623 Device Boot Start End Blocks Id System /dev/sda1 * 2048 480278527 240138240 83 Linux /dev/sda2 480280574 488396799 4058113 5 Extended /dev/sda5 480280576 488396799 4058112 82 Linux swap / Solaris This seems correct. But df -h /dev/sda (and /dev/sda1 and /dev/sda2 and /dev/sda5) returns: Filesystem Size Used Avail Use% Mounted on udev 10M 0 10M 0% /dev The same happens with every entry under /dev/disk/by-id and /dev/disk/by-path. Only one of two entries under /dev/disk/by-uuid returns the correct volume size: df -h /dev/disk/by-uuid/cacdbad6-7e6b-4e80-84ba-e3c77ef48796 Filesystem Size Used Avail Use% Mounted on /dev/disk/by-uuid/cacdbad6-7e6b-4e80-84ba-e3c77ef48796 229G 22G 196G 11% / Contents of /etc/fstab: # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/sda1 during installation UUID=cacdbad6-7e6b-4e80-84ba-e3c77ef48796 / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=45840d13-ee36-4e77-8e73-16cbdff25eb1 none swap sw 0 0 /dev/sr0 /media/cdrom0 udf,iso9660 user,noauto 0 0 /dev/fd0 /media/floppy0 auto rw,user,noauto 0 0 It seems all other references than the uuid points to the swap partition. Is this because Wheezy is in testing, and should it be reported as an error?

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• IPTables Reroute SSH based on Connection string?

  - by senrabdet

  We are using a cloud server (Debian Squeeze) where public ports on a public IP route traffic to internal servers. We are looking for a way to use IPTables and ssh where based on some part of the ssh connection string (or something along these lines) iptables will reroute the ssh connection to the "right" internal server. This would allow us to use one common public port, and then re-route ssh connections to individual servers. So, for example we hope to do something like the following: user issues ssh connection (public key encryption) such as ssh -X -v -p xxx [email protected] but maybe adds something into the string for iptables to use iptables uses some part of that string or some means to re-route the connection to an internal server using something like iptables -t nat -A PREROUTING ! -s xxx.xxx.xxx.0/24 -m tcp -p tcp --dport $EXTPORT -j DNAT --to-destination $HOST:$INTPORT ....where $HOST is the internal ip of a server, $EXTPORT is the common public facing port and $INTPORT is the internal server port. It appears that the "string" aspect of iptables does not do what we want. We can currently route based on the IP table syntax we're using, but rely on having a separate public port for each server and are hoping to use one common public port and then re-route to specific internal servers based on some part of the ssh connection string or some other means. Any suggestions? Thanks!

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• squid configuration change to accept http request on LAN

  - by Ratan Kumar

  installed squid + dansguardian to block adult content on my linux (ubuntu 12.10) . everything worked fine. it has blocked as expected . now the problem is i am also running an apache server for my LAN . ( kind of website ) but when accessing it via 192.168.0.1 , it says squid has blocked the connection , this is the exact error The following error was encountered while trying to retrieve the URL: http: //192.168.0.16/ Connection to 192.168.0.16 failed. The system returned: (113) No route to host The remote host or network may be down. Please try the request again. Your cache administrator is webmaster. before configuring the squid it was working fine . what changes in the squid.conf i have to make . i tried acl Safe_ports 80 allow_all Safe_ports ( i want to know how i can configure it again to listen HTTP request from LAN )

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• SSH Connection Error : ssh_exchange_identification: read: Connection reset by peer

  - by Senthil G

  When I tried to connect to the server via SSH, I'm getting the following error, [root@oneeighty ~]# ssh -vvv -p 443 [email protected] OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to xxx.xxx.xxx [IP] port 443. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: identity file /root/.ssh/identity type -1 debug1: identity file /root/.ssh/id_rsa type -1 debug1: identity file /root/.ssh/id_dsa type -1 debug1: loaded 3 keys ssh_exchange_identification: read: Connection reset by peer I have checked the SSH configuration on server and client and there are no issues. Restarted the SSH Service on Server and then restarted the server/client. But the issues is not resolved. Please help to fix the issue. Thanks in Advance, -Senthil

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• connecting hostname to server

  - by Michael Ropy

  I have an ubuntu server installed on my server with virtualmin webmin. everything is good the server itself....I can connect to localhost and the virtualmin manager (http://localhost:10000). the problem is, I can't connect to it from a client computer. For example when I enter the IP address of the server, its shows me 403 forbidden error (sometimes its shows the homepage right)...but the virtualmin manager could not open... if my website is example.com with this ip: xxx.xxx.xxx.xxx, i can't connect to example.com:10000 or xxx.xxx.xxx.xxx:10000 what should I do?

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• HAProxy reqrep remove URI on backend request

  - by Jim

  real quick question regarding HAProxy reqrep. I am trying to rewrite/replace the request that gets sent to the backend. I have the following example domain and URIs http://domain/web1 http://domain/web2 I want web1 to go to backend webfarm1, and web2 to go to webfarm2. Currently this does happen. However I want to strip off the web1 or web2 URI when the request is sent to the backend. Here is my haproxy.cfg frontend webVIP_80 mode http bind :80 #acl routing to backend acl web1_path path_beg /web1 acl web2_path path_beg /web2 #which backend use_backend webfarm1 if web1_path use_backend webfarm2 if web2_path default_backend webfarm1 backend webfarm1 mode http reqrep ^([^\ ]*)\ /web1/(.*) \1\ /\2 balance roundrobin option httpchk HEAD /index HTTP/1.1\r\nHost:\ example.com server webtest1 10.0.0.10:80 weight 5 check slowstart 5000ms server webtest2 10.0.0.20:80 weight 5 check slowstart 5000ms backend webfarm2 mode http reqrep ^([^\ ]*)\ /web2/(.*) \1\ /\2 balance roundrobin option httpchk HEAD /index HTTP/1.1\r\nHost:\ example.com server webtest1-farm2 10.0.0.110:80 weight 5 check slowstart 5000ms server webtest2-farm2 10.0.0.120:80 weight 5 check slowstart 5000ms If I go to http://domain/web1 or http://domain/web2 I see it in the error logs that the request on a server in each backend that the requst is for the resource /web1 or /web2 respectively. Therefore I believe there to be something wrong with my regular expression, even though I copied and pasted it from the Documentation. http://code.google.com/p/haproxy-docs/wiki/reqrep Summary: I'm trying to route traffic based on URI, however I want to strip the URI on the backend side. Go to http://domain/web1 -- backend request of / to webfarm1 Thank you! -Jim

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• How to maintain the log source host using logstash

  - by Ray Rodriguez

  I am following the steps in this blog to set up rsyslog + logstash + graylog2 and I can't figure out how to replace the @source_host attribute in logstash using the mutate - replace filter. In the exmaple the author replaces his @source_host with a string value but I'd like to use the actual value that is parsed from in this case a syslog. mutate { type => loc1 replace => ["@source_host", "loc1"] } mutate { type => loc2 replace => ["@source_host", "loc2"] } How do I actually maintain the original source host in my logs?

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• Inconsistent DHCP replies with Windows 2008R2 DHCP server

  - by verbalicious

  I've got a Windows 2008R2 standard server running DHCP services. We've noticed that certain clients are receiving inconsistent DHCP replies. We have over 175 Windows workstations in this VLAN that don't seem to have trouble getting DHCP leases. However, PXE-booting clients trying to reach our DHCP server are able to get a lease inconsistently. Additionally, we tried using the "dhcping" tool against our DHCP server and found that roughly two of every three requests time out with "no answer" -- and this holds true when we set the timeout value on dhcping to 20seconds. After a failed attempt, however, we may get a dhcp lease reply immediately with dhcping. This leads me to believe that this issue isn't confined to PXE booting clients, but something more systemic with my LAN layer2 or DHCP. And that possibly my 175 windows clients are experiencing this in some form without my knowledge. We have over 30% of our scope available so the addresses are there. I was unable to find anything in the Windows server "DHCP-Server" log. Of course, my goal is to have my DHCP server reply to every request that it receives on the LAN!

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• Can't install Nuget or other extension to VS2012 on Win8

  - by VinnyG

  When I try to install any extension for visual studio ultimate 2012 on my new installation of Winodws 8 I get this exception : System.IO.FileNotFoundException: The system cannot find the file specified. (Exception from HRESULT: 0x80070002) at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo) at Microsoft.VisualStudio.Settings.ExternalSettingsManager.GetScopePaths(String applicationPath, String suffixOrName, String vsVersion, Boolean isLogged, Boolean isForIsolatedApplication) at Microsoft.VisualStudio.Settings.ExternalSettingsManager.CreateForApplication(String applicationPath) at VSIXInstaller.App.GetExtensionManager(SupportedVSSKU sku) at VSIXInstaller.App.GetExtensionManagerForApplicableSKU(SupportedVSSKU supportedSKU, IInstallableExtension installableExtension, List`1 applicableSKUs) at VSIXInstaller.App.InitializeInstall() at System.Threading.Tasks.Task.InnerInvoke() at System.Threading.Tasks.Task.Execute() I tryed to repair VS, did not work, and also try to uninstall/install and got the same problem. Anybody as an idea?

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• Ultrabook graphics card for gaming

  - by Francisc

  I want to get a Windows 8 "ultrabook" that I can also use for gaming. Most seem to have Intel HD Graphics 4000 (integrated) or NVIDIA GeForce GT 620M (dedicated). From experience, are they any good? Things I enjoy playing are Call of Duty, Fifa and Skyrim for example. I'm looking for a device that will work on the next generation of those games as well, so it shouldn't just barely work on the current versions that exist now. So, would those two cards suffice? Any advice is much appreciated. Thank you.

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• How to open the Quota Entries list for a given drive from a shortcut or command line?

  - by Indrek

  Is it possible to open the Quota Entries list for a given drive from a shortcut or the command line in Windows? And if so, how? I'm not talking about managing quota entries from the command line (fsutil quota), I'm looking for a way to get directly to the Quota Entries GUI rather than going through My Computer → right-click on a drive → Properties → Quota tab → Show Quota Settings → Quota Entries... I managed to find out (using Process Explorer) that the backend process is dllhost.exe, and the DLL in question should be dskquoui.dll, so it should be possible to run it directly with rundll32.exe, but I'm not sure of the exact syntax. Any ideas?

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• Cannot Copy Pictures w/ text or w/o from web pages anymore word in office starter 2010

  - by Mindy Billings

  This is something new. I had been able to copy text and pictures from websites into a microsoft word office starter 2010. I have gone into advanced settings to no avail. I have verified that under paste special html is selected. I have reviewed the help sections and questions and they all tell me to select html under paste special but again it isn't working either. Also I used to have 3 formatting options under paste and am now only having two options. I did have a problem with my computer last night and I am wondering if something re-set itself..will you help?

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• Run command automatically as root after login

  - by J V

  I'm using evrouter to simulate keypresses from my mouses extra buttons. It works great but I need to run the command with sudo to make it work so I can't just use my DE to handle autostart. I considered init.d but from what I've heard this only works for different stages of boot, and I need this to run as root after login. $ cat .evrouterrc "Logitech G500" "/dev/input/event4" any key/277 "XKey/0" "Logitech G500" "/dev/input/event4" any key/280 "XKey/9" "Logitech G500" "/dev/input/event4" any key/281 "XKey/8" $ sudo evrouter /dev/input/event4

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• How to cleanup tmp folder safely on Linux

  - by Syncopated

  I use RAM for my tmpfs /tmp, 2GB, to be exact. Normally, this is enough but sometimes, processes create files in there and fail to cleanup after themselves. This can happen if they crash. I need to delete these orphaned tmp files or else future process will run out of space on /tmp. How can I safely garbage collect /tmp? Some people do it by checking last modification timestamp, but this approach is unsafe because there can be long-running processes that still need those files. A safer approach is to combine the last modification timestamp condition with the condition that no process has a file handle for the file. Is there a program/script/etc that embodies this approach or some other approach that is also safe? Incidentally, does Linux/Unix allow a mode of file opening with creation wherein the created file is deleted when the creating process terminates, even if it's from a crash?

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• Loading and unloading ISO files in Windows 8

  - by Mohd. Ismail

  I saw on one site that the new Windows 8 could load ISO images without the help of other programs. Is Windows 8 creating a new drive for every ISO? Or does it have one fake drive to load all ISOS in? How can I know if a file is really an ISO inside? Some PCs use UltraISO to open ISOs. If I just enter the ISO name in DOS, it is loading in UltraISO. How can I load the ISO only in Windows 8 on all PCs, whether they have UltraISO or not? How can I unload ISOs?

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• Why won't Windows use the other CPU cores?

  - by revloc02

  In Windows Task Manager the Performance tab shows the first CPU maxed out, the other 7 just idling along with the occasional spike. What gives? More info: I've got 8GB and only 4.5GB are being used. The Processes tab has no indication of any process hogging processing power. In fact System Idle Process is 98-99. When I program stuff and have like 8 to 12 applications going (several directly unrelated to programming of course) my computer slows to a crawl. Sysyem Info: Intel Core i7-2600K Processor (quad-core with hyper-threading), 8GB RAM, Intel BOXDZ68BC LGA 1155 Motherboard, 500GB HDD

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• Is it possible to install a discrete mobility card on a laptop without a graphics card already?

  - by JXPheonix

  To be specific: Can I: Install a discrete graphics card on a laptop that does not come with a discrete graphics card? Teach windows 8 to use the discrete card over the integrated graphics? To me this is the only downside of my laptop and I would not mind getting any graphics card as long as it is better than the integrated laptop card (an Intel 3000) The laptop if you need more information is an Asus U46E-BAL6.

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• How to compile gcc-4.0 on Mountain Lion

  - by Frizlab

  So far I've successfully launched the configure, but when I type make, I get the following error, after some time (there's a lot which compile successfully): ld: unknown/unsupported architecture name for: -arch i686 /usr/bin/libtool: internal link edit command failed make[2]: *** [libgcc_s.dylib] Error 1 make[1]: *** [libgcc.a] Error 2 make: *** [all-gcc] Error 2 Is there a way to tell gcc not to compile itself for the i686 architecture? Here's my uname -a if it can help: Darwin Frizlabs-Computer.local 12.2.0 Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64 PS: I know gcc-4.0 is ancient, but I do need it.

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• How to disable the Windows 8 lock screen, without disabling the password?

  - by zeel

  Windows 8 now has a slide-away lock screen like so many other OSes designed for a touch interface. However on a non-touch PC/laptop this is just an extra annoying step in logging in. There is an option to disable it, but this also turns off the password requirement. Is there a way to disable the lock screen, and have Windows wake up directly to the password entry screen? Often when pressing a key to hide it there will be a noticeable delay before password entry is accepted, and no indicator, so one can easily lose the first character or so that they attempt to type, thus failing the login attempt.

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• Rsync and Windows 7

  - by Nate

  Can someone give me any tips on setting up some sort of Rsync server/client on Windows 7 to run rsync between both my web hosting server, and a backup server that I have running Ubuntu? I've tried setting it up with this tutorial: http://www.youtube.com/watch?v=CvwdkZLNtnA Using copssh, and cwrsync. Ran into all sorts of troubles, including not being able to get cwrsync to run (it installs properly, but never starts up), and copssh not generating the keys at all. The guy was running Windows Server 2003, though, so I'm guessing the problems could just be because I'm running Windows 7. I've been trying to set it up with my Windows machine being the rsync server, and then Ubuntu and my webhosting VPS as the clients, but I realize it may be easier (and make more sense) to just setup the rsync server on Ubuntu, and then an rsync client on Windows 7? Can anyone point me in the right direction? I'm thinking of using this guide: http://www.gaztronics.net/rsync.php It seems a bit outdated, though.

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• delete duplicate files with windows batch file?

  - by Chris Sobolewski

  I have a program that automatically copies files to a directory, and if it creates a duplicate it will name it like so: file with duplicate.xxx file with duplicate - 1.xxx file with duplicate - 2.xxx I need a way to delete all the duplicates with a windows batch file. Something along the lines of: FOR %f IN (C:\files\*.*) DO del "%f - 1" However, that will not work because that would resolve to file with duplicate - 1.xxx - 1

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• The Best Free Alternatives to the Windows Task Manager

  - by Lori Kaufman

  The Windows Task Manager is a built-in tool that allows you to check which services are running in the background, how much resources are being used by which software programs, and the all-to-common task of killing programs that are not responding. Even though the Windows Task Manager has several useful tools, there are many free alternatives available that provide additional or expanded features, allowing you to more closely monitor and tweak your system. How To Play DVDs on Windows 8 6 Start Menu Replacements for Windows 8 What Is the Purpose of the “Do Not Cover This Hole” Hole on Hard Drives?

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