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• Cacti not working for SNMP data sources

  - by lorenzo-s

  I installed packages cacti and snmpd on a Debian server. I'm able to display common graphs in Cacti (such as memory usage, load average, logged in users, etc) using the data templates listed as Unix. Now I want to replace these graphs with new ones using SNMP data sources, because I see there is also CPU usage and because it's not excluded I have to manage multiple hosts in the future. So, I installed snmpd on the machine and left the snmpd.conf as it is. In Cacti, I created three new data sources from SNMP templates for 127.0.0.1 host: ucd/net - CPU Usage - Nice ucd/net - CPU Usage - System ucd/net - CPU Usage - User Then I created a new graph from template ucd/net - CPU Usage, and select the three data sources in the Graph Item Fields section. Graph is now enabled and running, but empty. No data have been collected. Under Console - Devices my SNMP host is listed as up and running: System:Linux ip-xx-xx-xxx-xxx 3.2.0-23-virtual #36-Ubuntu SMP Tue Apr 10 22:29:03 UTC 2012 x86_64 Uptime: 929267 (0 days, 2 hours, 34 minutes) Hostname: ip-xx-xx-xxx-xxx Location: Sitting on the Dock of the Bay Contact: Me [email protected] In SNMP Options I left all as it is: SNMP Version: Version 1 SNMP Community: public SNMP Timeout: 500 ms Maximum OID's Per Get Request: 10 In Console - Utilities - Cacti Log I have multiple warning (two for each data source) every 5 minutes: 10/29/2012 01:45:01 PM - CMDPHP: Poller[0] Host[2] DS[18] WARNING: Result from SNMP not valid. Partial Result: U 10/29/2012 01:45:01 PM - CMDPHP: Poller[0] WARNING: SNMP Get Timeout for Host:'127.0.0.1', and OID:'.1.3.6.1.4.1.2021.4.15.0' 10/29/2012 01:45:01 PM - CMDPHP: Poller[0] Host[1] DS[9] WARNING: Result from SNMP not valid. Partial Result: U 10/29/2012 01:45:01 PM - CMDPHP: Poller[0] WARNING: SNMP Get Timeout for Host:'127.0.0.1', and OID:'.1.3.6.1.4.1.2021.11.52.0' 10/29/2012 01:40:01 PM - CMDPHP: Poller[0] Host[2] DS[19] WARNING: Result from SNMP not valid. Partial Result: U 10/29/2012 01:40:01 PM - CMDPHP: Poller[0] WARNING: SNMP Get Timeout for Host:'127.0.0.1', and OID:'.1.3.6.1.4.1.2021.4.6.0' [...] I have the feeling I'm missing something, but I cannot get it...

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• Using GitOAuthPlugin for Jenkins - not working as expected

  - by Blundell

  I need some clarity and maybe a fix. I'm using this plugin to authorise who views our Jenkins ci server: https://wiki.jenkins-ci.org/display/JENKINS/Github+OAuth+Plugin As I understand it anyone who is auth'd to view one of our github project's can also login to our Jenkins box. This works I thought it would also allow the person logging in to only view the Project that they have GitHub permission on. For instance. Three projects on GitHub (A,B,C). Three builds on Jenkins. User 1 has Git access to all 3 projects (A B C). User 2 has Git access to only 1 project (A). When logging into Jenkins: User 1 can see all 3 projects ( this works ) User 2 can only see project A The problem is User 2 can also see all 3 projects when they should only see 1! Have I got this correct, and if so is this a bug? I have the settings set in Jenkins configuration Github Authorization Settings. Here we have some admin users. One organization. And none out of the 4 checkboxes ticked. (User 2, is not an admin, is not part of the org). The plugin is open sourced here: https://github.com/mocleiri/github-oauth-plugin I was trying to get Jenkins to print me the Logs from the plugin but I also failed at viewing these (to see if there was an issue). I followed these instructions: https://wiki.jenkins-ci.org/display/JENKINS/Logging It's the same concept as outlined below but using GitHub rather than manually selecting users: https://wiki.jenkins-ci.org/display/JENKINS/2012/01/03/Allow+access+to+specific+projects+for+Users%28Assigning+security+for+projects+in+Jenkins%29 Have I got this right or wrong? Is it possible to auth a Jenkins user to only see one project?

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• Boot iMac into Centos from external hard drive

  - by user1704978

  I have Centos 6.3 installed on an external Western Digital drive with Firewire and USB interfaces. I want to be able to boot an iMac (2008, 3.06GHz Core 2 Duo) from this disk. The iMac has Mac OS X 10.5.8 and also a Window XP installation. I have tried holding 'T' on bootup for target disk mode but the external disk is ignored (presumably as it's not a Mac OSX image). I created an rEFit boot DVD which when booted in CD mode (holding 'C' on startup) displays three options, Mac OS (on internal drive), Linux and Windows. Selecting the Linux option unfortunately boots the Mac into XP. Three options are only displayed when the external disk is plugged into the Firewire port. If the external disk is plugged into a USB port the Linux option is not displayed and I can only boot into Mac OS X or Windows. This external disk will happily boot a Lenovo T410 laptop into Centos. My questions are: 1) Is it actually possible to boot into Centos on an iMac with an external hard drive. If so how do I achieve this? 2) Why is rEFit apparently booting from the wrong partition?

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• Do I need liquid cooling?

  - by Mrrvomun

  I'm building a computer mainly for gaming and developing games. It's going to be a three screen system with two GeForce GTX 460's and a quad-core i7. The newegg wattage calculator says I need around 900W. The case I intend to get is this one. Full specs if you need 'em are at the end of this post. I have no intentions to overclock the system at the moment, but this may change in the future. I've done a lot of research on the subject, and the answers I've found indicate that it takes a heck of a lot of power to require liquid cooling, and most non-overclocked systems don't need it. But I haven't seen a question about a system with two GPU's, so I ask you the following two questions: Assuming that the system is used for gaming for very extended periods of time (say 4-6 hours at a time, nonstop) with all three screens running at full 1080p, would the fans installed in the system suffice? Or would I need more fans and/or liquid cooling? If the system is used under the same circumstances as above, and is overclocked to a reasonable level, would the fans installed in the system suffice? Or would I need more fans and/or liquid cooling? Specs: Intel Core i7 16GB DDR3 Two nVIDIA GeForce GTX 460 3TB HDD Two DVD-RW writers Thermaltake 1050W power supply Case is linked above

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• Troubleshooting wireless connection problem / site survey?

  - by johnnyb10

  I just started in the IT department of a small company (200 users) and it's clear that one of the main problems that is driving everyone crazy is the spotty nature of the wireless connectivity throughout the office, particularly in certain conference rooms. This is a huge problem because the connection often drops during important presentations to clients. I was hired to help ease the load on the existing IT admin, who has done a great job, but is overloaded with many other tasks to deal with. So I would like to try to help out with this wireless issue. I am looking for advice on the best way to solve this problem--a realistic troubleshooting methodology that does not require me to spend any money. So far, I've experimented with Ekahau Heat Mapper, which is free and helps create a site survey. But I'm not exactly sure what I'm looking for or if there are other programs/tools/methods I should try as well. Any advice would be greatly appreciated. [Some background: The wireless setup consists of an HP ProCurve Mobility MSM (710?) controller that controls 10 access points throughout the building. There are three virtual wireless networks configured on the controller: one seems to be a default that cannot be changed, one is for internal employees and authenticates via Active Directory, and the third is a guest network for visitors. When I use HeatMapper, these show up as three different SSIDs, with different MAC addresses, all on the same channel. At first I thought maybe this would cause interference, but this seems to be the way the controller works;apparently, it automatically configures the channels to avoid interference from the other APs on the network.]

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• NetBackup prefers "Scratch" tapes over dedicated tapes

  - by wfaulk

  I have a NetBackup 6.0MP7 installation running on Windows Server 2003. It functions as the only Master Server and Media Server. I swap a full set of tapes in and out every week, but leave a set of tapes with their Volume Pool set to "Scratch" in all the time. The weekly tape sets then get rotated back in after a period of time. Largely, this works fine. I seldom actually need the scratch tapes, but every once in a while, a backup will run over what I have dedicated to the task. However, one week's set of tapes consistently gets declined in favor of the scratch pool. The backup policies are the same for every week, they all have "Policy Volume Pool" set to "NetBackup", and all of the tapes for every week (beside the scratch tapes) have had their pools assigned as "NetBackup", definitely including the week that always gets ignored. That said, it doesn't ignore all of the NetBackup pool tapes for that week. It does usually write to two or three of them, but it writes to like 20 of the scratch tapes. (I haven't thought to look to see if it's always the same two or three tapes.) And this problem never seems to occur for any other week. It doesn't load the tapes and then reject them; it never seems to try to use them at all. They are not flagged as frozen. They are all active and unassigned when I swap them in. The tapes are in a Quantum PX510 tape library. The NetBackup server is attached to the library/robot via fibrechannel going through an HP-branded Brocade switch. I'm not an expert on NetBackup at all. I don't really even know where to look. Any advice on logs to look at or logging to enable or really anything at all would be appreciated. I'll keep an eye on the question and update it if anyone needs any more info to help.

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• OS X AFP shares and access

  - by gbrandt

  I am running 10.5.6 Client as a mini server and am having problems with AFP shares. All clients are OS X 10.5.7 I have created three users for 'File Sharing' only on the 'server'. I have created groups and placed these users into specific groups. I have created ACL's to give each group access to certain shares. Two of those users can read and write to any share, one user cannot write to the shares, with different results: when copying a directory, only the directory is created, no files inside are copied, the OS does not give any errors when copying a single file I get three dialogs: "You may need to enter the name and password for an administrator on this computer to change the item named 'xxxx', "The item 'xxxxx' contains one or more items you do not have permission to read. Do you want to copy the items you are allowed to read?, and, The operation cannot be completed because you do not have sufficient priveleges for some of the items. With the single file, a file gets created on the server, but is empty. My ACL for the group this user belongs to is: 0: group:projectmembers allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,file_inherit,directory_inherit 1: group:informationtechnology inherited allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,file_inherit,directory_inherit 2: group:executive inherited allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,file_inherit,directory_inherit 3: group:everyone inherited deny list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,file_inherit,directory_inherit User 1 & 2 belong to informationtechnology and executive and projectmembers, they can read and write freely on the share. User 3 belongs to projectmembers and cannot read and write freely. I have read that this is a UID issue, however User 1 & 2 do not have matching UID's across clients and server and they work, so I don't think this is the case. Any ideas?

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• Are Colocation Cross Connects Worth While

  - by SvrGuy

  We currently operate three clusters of collocated machines in different data centers. Recently, I became aware that our newest data center will offer to cross connect us to a bandwidth provider free of charge. In the past, I never really investigated a cross connect for bandwidth because I figured that the rates would be similar to what we are paying the colo now and that it would reduce our resiliency (because we would only be using one or two carriers for IP, where as the colo uses, say 8 different providers). Then I saw an ad for hurricane electric internet services (http://he.net/cgi-bin/ip_transit_quote) that gave a price for IP transit at $1/Mbs, which is much better than the $30/Mb we pay for the blended bandwidth. What are people out there typically paying for bandwith via cross connect and how hard is to setup? Is my understanding that what you do is open agreemetns with two or three ISPs, cross connect to them and then configure your top of rack router on their network. Can you really get IP transit down to a couple of dollars per megabit per month just by doing the routing yourself? Or, is my understanding of cross connection fundamentally wrong?

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• Any chance to extract Windows from recovery DVDs

  - by Pekka

  I have an Acer Tablet PC that came with WIndows XP Tablet PC Edition in the form of three recovery DVDs. Sadly, a mainboard fault put the machine out of business. I have now bought a used one from a different manufacturer that comes without an operating system. The recovery DVDs seem to contain three parts of a Norton Ghost image, and nothing else. The recovery DVD won't even start on a Non-Acer system. I'm a bit miffed because I legally own a Windows XP Tablet PC Edition license that I now can't use on the original machine any more. As far as I know, it's not legal in my jurisdiction for them to bind the license to a certain machine. I want to continue using the operating system on the new machine. Is there any chance of extracting usable Windows XP installation files from that image? How are such image files usually made up? Is there any free software around that can read Norton Ghost images so I can take a peek myself?

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• Samba and Windows 7

  - by John Gaughan

  I built a new computer with the intention of it being primarily a home file server. Here is my setup: one desktop with Windows 7 64 HP one laptop with Windows 7 64 HP one desktop with Kubuntu 11.10 (server) The two desktops use static IPs, and I have hostnames mapped in the HOSTS files on all three systems. I have the same username/password combo on all three systems. I have been trying for a while now to set up Samba so the Windows 7 systems can see and use it. Even if I can get the server to show up, Windows is unable to log in. One of the first things I did was to enable LMv2 authentication, which this version of Samba (3.5.11) supports. The workgroup is set correctly. I can normally see the server, but cannot authenticate. Windows homegroup is turned off. Pinging between machines works fine, and the two Windows 7 systems work together flawlessly. What I am trying to do is set up Samba to use peer to peer networking using NTLM security and user-mode authentication. According to the documentation this is possible, but there are no examples that I could find. In all the googling I have done, I see a lot of people asking how to set this up but it either works for someone else and not for me (no idea what I'm missing), or it doesn't work. Has anyone gotten this to work? Is there a place I could download a smb.conf that is set up to work in this environment?

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• Cooling for a small server room

  - by John Zwinck

  I have a server room about 12 feet square with an unfinished ceiling (exposed ducts and wiring). It houses a few servers (about ten, 1U and 2U) and some networking gear (four 1U switches, three routers, three modems, two cable boxes). With the door closed, it runs around 80 degrees Fahrenheit with half the servers turned on. When I turned on all the servers it reached 86 before I chickened out and propped the door open. The room is adjacent to air-conditioned office space, but does not itself have dedicated air conditioning. The ventilation for this room seems to be limited to one duct coming in at ceiling level, with a powered fan to draw air in, and one duct at ceiling level to allow air to flow out (it seems like it may just go into the drop ceiling cavity in the adjacent room). The adjacent office space stays fairly cool, but I'd prefer not to leave the door propped open all the time. There is both 110v and 208v service in the room, and plenty of power available. But there are no windows, and no floor drains (in a pinch we might be able to run a condensation hose through a small hole we'd drill in the wall to a nearby sink area, but only if absolutely necessary). I've considered portable A/C units, but I'm not sure on sizing and a lot less sure how we would run the exhaust hose(s). I suppose we could point one at the existing room exhaust duct (air return), but substantially modifying the duct is probably a no-no. I've also considered installing a fan box in the door of the room, but I'm concerned that this will only drop the temperature a little. Even right now, with all the equipment on, the room is at 83 degrees with the door open. And the main building A/C turns off daily at 6 PM to conserve energy, so the adjacent room temperature rises at night. How would you cool this room? Let's say the goal is to bring the temperature with everything running from a steady state of around 90 degrees down to 75 (equivalently, to offset the heat produced by ten 1U servers).

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• Help setting up a secondary authoritative DNS server.

  - by GLB03

  We have three Authoritative DNS servers and three recursive/caching DNS servers on my campus. Authoritative servers DNS1- Windows 2003 DNS2- Old Red Hat ----- Replacing w/ newer version DNS3- Windows 2008 (I installed) Caching and Recursive resolvers servers Server1- Windows 2003 Server2- CentOS 5.2 (I installed) Server3- CentOS 5.3 (I installed) I am replacing DNS2 with a newer Red Hat version, but have no documentation on how it was implemented. I have setup caching and windows authoritative servers, but not a linux secondary authoritative server. I have a perl script from the original server that pulls data from our DNS1 server. We use DJBDNS and TinyDNS on our linux servers. Our Network Engineer says the DNS2 server I am replacing is an authoritative server that doesn't need to be caching, but the only instructions I see is for an Authoritative server that does caching as well. Can someone point me in the right directions. I thought I was on the right track with using these instructions but when I query my new dns server I get "No response from server", I have temporarily disabled iptables to eliminate it from being an issue. ps -aux | grep dns avahi 3493 0.0 0.2 2600 1272 ? Ss Apr24 0:05 avahi-daemon: running [newdns2.local] root 5254 0.0 0.1 3920 680 pts/0 R+ 09:56 0:00 grep dns root 6451 0.0 0.0 1528 308 ? S Apr29 0:00 supervise tinydns dnslog 6454 0.0 0.0 1540 308 ? S Apr29 0:00 multilog t ./main tinydns 9269 0.0 0.0 1652 308 ? S Apr29 0:00 /usr/local/bin/tinydns

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• How do I run a stable Windows XP kvm guest on Ubuntu 10.04?

  - by Jean-Paul Calderone

  I have three Windows XP guests running on a recently upgraded 64-bit Ubuntu 10.04 system. Occasionally (on the order of once every few days), one of the guests will become non-responsive and the kvm process on the host which is running that guest will start consuming 100% CPU. It will continue to do so until it is killed. When restarted, it will be fine for a while, and then the issue repeats. The kvm command line used to run all three guests is this: /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 1024 -smp 1 -name bigdog21vmxp1 \ -uuid ea47ff84-125b-16f7-9a4d-a6d0d8bab46a \ -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/bigdog21vmxp1.monitor,server,nowait \ -monitor chardev:monitor \ -localtime \ -boot c \ -drive file=/var/lib/libvirt/images/windowsxp-1.qcow2,if=ide,index=0,boot=on,format=qcow2 \ -net nic,macaddr=54:52:00:02:06:0e,vlan=0,name=nic.0 \ -net tap,fd=58,vlan=0,name=tap.0 \ -chardev pty,id=serial0 \ -serial chardev:serial0 \ -parallel none \ -usb \ -usbdevice tablet \ -vnc 127.0.0.1:1 \ -k en-us \ -vga cirrus \ -soundhw es1370 Why do the systems misbehave this way sometimes? And what configuration can I change in order to fix it? Or, if the problem is due to a bug in kvm, what is the process for isolating a kvm failure so that the developers have a chance of fixing it?

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• ntpd on Fedora Core 6 with high negative time reset values

  - by Mark White

  The basic problem is we have a FC6 server instance running on a virtual machine, and the system time seems to have been slowly varying until it is now causing a problem. The server runs 24/7 and has been up for 155 days. It has been changed to show GMT, and reports the time as (example) 00:15:15 GMT whereas the actual time is 00:00:00 GMT. This is an offset of 915 seconds. selinux has been changed to 'setenforce 0' for testing and I am running as root. I stop the ntpd service and change the time in System|Administration|Date & Time. The time still shows the same with 'date' in bash. There are no error logs. I change the date with 'date --set' in bash. The response confirms the changed date. I run 'date' and the incorrect date is shown. There are no error logs. I start the ntpd service and /var/log/messages shows success with 'time reset -915.720139s'. The date remains unchanged. ntpq -p shows three three time servers all have offsets of around -915 seconds. I stop ntpd service and try 'ntpd -gqx' and get the same result as above - success, but a large negative time reset. I've tried varying combinations of the above, and a few more settings in System|Administration|Date & Time - no change. I just need to reset the system time to GMT. No offset. But I can't wait for ntpd to slew the time over the next few weeks. Any advice is welcome, cheers! Surely this shouldn't be this difficult... Mark...

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• replica set with multiple primary nodes

  - by miguel

  I am trying to configure a replica set with three nodes: node A, B and C. I execute the rs.add()'s from node A and after that rs.status() shows that the three nodes are PRIMARY. Moreover node B and C have 0 pingMs. If I execute rs.status() from node B or C the only node listed is the self (As PRIMARY). I tried adding an arbiter but it didn't work (it behaved as the nodes B and C). I think this can be a networking problem but I can't figure it out. Edit: This is the output for netstat -anp|grep 27017: tcp 0 0 0.0.0.0:27017 0.0.0.0:* LISTEN - tcp 0 0 10.0.1.211:55772 10.0.1.213:27017 TIME_WAIT - tcp 0 0 127.0.0.1:50509 127.0.0.1:27017 ESTABLISHED - tcp 0 0 127.0.0.1:27017 127.0.0.1:50509 ESTABLISHED - tcp 0 0 10.0.1.211:55774 10.0.1.213:27017 TIME_WAIT - tcp 0 0 10.0.1.211:55776 10.0.1.213:27017 ESTABLISHED - tcp 0 0 10.0.1.211:39180 10.0.1.212:27017 ESTABLISHED - tcp 0 0 10.0.1.211:39178 10.0.1.212:27017 TIME_WAIT - tcp 0 0 10.0.1.211:39176 10.0.1.212:27017 TIME_WAIT - unix 2 [ ACC ] STREAM LISTENING 3291267 - /tmp/mongodb-27017.sock the private ips for the node B and C are 10.0.1.212 and 10.0.1.213 respectively (they appear to have an established connection in the 27017 port according to the netstat output).

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• SSH traffic over openvpn connection freezes when I cat a file

  - by user42055

  I have an openvpn (version 2.1_rc15 at both ends) connection setup between two gentoo boxes using shared keys. it works fine for the most part. I use mysql, http, ftp, scp over the vpn with no problems. But when I ssh from the client to the server over the vpn, weird things happen. I can login, i can execute some commands. But if i try to run an ncurses application like top, or i try to cat a file, the connection will stall and I'll have to sever the ssh session. I can, for example, execute "echo blah; echo .; echo blah" and it will output the three lines of text over the ssh session fine. But if i execute "cat /etc/motd" the session will freeze the moment I press enter. I compiled openvpn 2.1.1 on my mac and copied over my config directory from my gentoo client. The mac connected and ssh sessions worked fine without freezing. I then compiled it on my older gentoo box (2.6.26 kernel) which I am retiring due to a dying hard drive, and ssh over it also works perfectly. Why does it fail on my brand new gentoo box ? I've tried compiling three different kernels in case it was that, but other than that there should be no difference between my older and my newer gentoo boxes that I can think of. Any suggestions on what's wrong ?

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• Using UDF on a USB flash drive

  - by CesarB

  After failing to copy a file bigger than 4G to my 8G USB flash drive, I formatted it as ext3. While this is working fine for me so far, it will cause problems if I want to use it to copy files to someone which does not use Linux. I am thinking of formatting it as UDF instead, which I hope would allow it to be read (and possibly even written) on the three most popular operating systems (Windows, MacOS, and Linux), without having to install any extra drivers. However, from what I found on the web already, there seem to be several small gotchas related to which parameters are used to create the filesystem, which can reduce the compability (but most of the pages I found are about optical media, not USB flash drives). I would like to know: Which utility should I use to create the filesystem? (So far I have found mkudffs and genisoimage, and mkudffs seems the best option.) Which parameters should I use with the chosen utility for maximum compability? How compatible with the most common versions of these three operating systems UDF actually is? Is using UDF actually the best idea? Is there another filesystem which would have better compatibility, with no problematic restrictions like the FAT32 4G file size limit, and without having to install special drivers in every single computer which touches it?

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• Using UDF on a USB flash drive

  - by CesarB

  After failing to copy a file bigger than 4G to my 8G USB flash drive, I formatted it as ext3. While this is working fine for me so far, it will cause problems if I want to use it to copy files to someone which does not use Linux. I am thinking of formatting it as UDF instead, which I hope would allow it to be read (and possibly even written) on the three most popular operating systems (Windows, MacOS, and Linux), without having to install any extra drivers. However, from what I found on the web already, there seem to be several small gotchas related to which parameters are used to create the filesystem, which can reduce the compability (but most of the pages I found are about optical media, not USB flash drives). I would like to know: Which utility should I use to create the filesystem? (So far I have found mkudffs and genisoimage, and mkudffs seems the best option.) Which parameters should I use with the chosen utility for maximum compability? How compatible with the most common versions of these three operating systems UDF actually is? Is using UDF actually the best idea? Is there another filesystem which would have better compatibility, with no problematic restrictions like the FAT32 4G file size limit, and without having to install special drivers in every single computer which touches it?

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• Triple-monitor set-up (2 unique, 1 cloned): Can a VGA splitter be used on one output of a dual-head

  - by stakx

  Background: I'm currently researching hardware components for some kind of information terminal we're building. This application of ours makes use of three output screens: (1) A touch screen where all user input is made; (2) A regular LCD monitor where the requested information is being displayed; and (3) A projector which displays exactly the same signal as screen (2) does. (All screens will run at the same resolution of 1024x768 btw.) Now I figured that using a dual-head video card would be sufficient, let's say a Matrox P690 low-profile PCI card. This would involve having a Y cable connected to the graphics card itself, then two DVI-to-VGA adapters at each end of the Y cable, and then having a VGA splitter on one of the VGA outputs. The following shows the setup in question: 0--1---------2-> VGA (DSUB-15) \ \ ----2-3---------> VGA (DSUB-15) \ \ -----------------> VGA (DSUB-15) 0: graphics card (LFH60 jack) 1: LFH60 to DVI-I dual monitor Y cable 2: DVI-to-VGA adapters 3: VGA splitter cable Question(s): Will this work? I'm particularly concerned about the following points: Can a low-profile PCI video card output a signal which is strong enough for three monitors (even if it's a dual-head card)? Does the combination of so many adapters and splitter cables work? (The LFH-to-DVI cable comes with the video card) Will the VGA splitter cable degrade the signal on the output screen & projector significantly? (If so, would a USB-powered splitter cable remedy this problem?) I can't possibly expect anyone to answer all those questions, but any input is appreciated.

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• Cisco ASA Site-to-Site VPN Dropping

  - by ScottAdair

  I have three sites, Toronto (1.1.1.1), Mississauga (2.2.2.2) and San Francisco (3.3.3.3). All three sites have ASA 5520. All the sites are connected together with two site-to-site VPN links between each other location. My issue is that the tunnel between Toronto and San Francisco is very unstable, dropping every 40 min to 60 mins. The tunnel between Toronto and Mississauga (which is configured in the same manner) is fine with no drops. I also noticed that my pings with drop but the ASA thinks that the tunnel is still up and running. Here is the configuration of the tunnel. Toronto (1.1.1.1) crypto map Outside_map 1 match address Outside_cryptomap crypto map Outside_map 1 set peer 3.3.3.3 crypto map Outside_map 1 set ikev1 transform-set ESP-AES-256-MD5 ESP-AES-256-SHA crypto map Outside_map 1 set ikev2 ipsec-proposal AES256 group-policy GroupPolicy_3.3.3.3 internal group-policy GroupPolicy_3.3.3.3 attributes vpn-idle-timeout none vpn-tunnel-protocol ikev1 ikev2 tunnel-group 3.3.3.3 type ipsec-l2l tunnel-group 3.3.3.3 general-attributes default-group-policy GroupPolicy_3.3.3.3 tunnel-group 3.3.3.3 ipsec-attributes ikev1 pre-shared-key ***** isakmp keepalive disable ikev2 remote-authentication pre-shared-key ***** ikev2 local-authentication pre-shared-key ***** San Francisco (3.3.3.3) crypto map Outside_map0 2 match address Outside_cryptomap_1 crypto map Outside_map0 2 set peer 1.1.1.1 crypto map Outside_map0 2 set ikev1 transform-set ESP-AES-256-MD5 ESP-AES-256-SHA crypto map Outside_map0 2 set ikev2 ipsec-proposal AES256 group-policy GroupPolicy_1.1.1.1 internal group-policy GroupPolicy_1.1.1.1 attributes vpn-idle-timeout none vpn-tunnel-protocol ikev1 ikev2 tunnel-group 1.1.1.1 type ipsec-l2l tunnel-group 1.1.1.1 general-attributes default-group-policy GroupPolicy_1.1.1.1 tunnel-group 1.1.1.1 ipsec-attributes ikev1 pre-shared-key ***** isakmp keepalive disable ikev2 remote-authentication pre-shared-key ***** ikev2 local-authentication pre-shared-key ***** I'm at a loss. Any ideas?

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• Replicated MongoDB server slower than simple shards

  - by displayName

  I tried to compare the performance of a sharded configuration against a sharded and replicated configuration. The sharded configuration consists of 8 shards each running on three different machines thereby constituting a total of 24 shards. All 8 of these shards run in the same partition on each machine. The sharded and replicated version is 8 shards again just like plain sharding, and all 8 mongods run on the same partition in each machine. But apart from this, each of these three machine now run additional 16 threads on another partition which serve as the secondary for the 8 mongods running on other machines. This is the way I prepared a sharded and replicated configuration with data chunks having replication factor of 3. Important point to note is that once the data has been loaded, it is not modified. So after primary and secondaries have synchronized then it doesn't matter which one i read from. To run the queries, I use an entirely different machine (let's call it config) which runs mongos and this machine's only purpose is to receive queries and run them on the cluster. Contrary to my expectations, plain sharding of 8 threads on each machine (total = 3 * 8 = 24) is performing better for queries than the sharded + replicated configuration. I have a script written to perform the query. So in order to time the scripts, I use time ./testScript and see the result. I tried changing the reading preference for replicated cluster by logging to mongo of config and run db.getMongo().setReadPref('secondary') and then exit the shell and run the queries like time ./testScript. The questions are: Where am i going wrong in the replication? Why is it slower than its plain sharding version? Does the db.getMongo().ReadPref('secondary') persist when i leave the shell and try to perform the query? All the four machines are running Linux and i have already increased the ulimit -n to 2048 from initial value of 1024 to allow more connections. The collections are properly distributed and all the mongods have equal number of chunks. Goes without saying that indices in both configurations are the same.

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• IIS 7.0 - responses throttled to 500ms blocks?

  - by Julia Hayward

  Scenario: ASP.NET MVC wep app sitting on my local machine (Vista Ultimate, IIS 7.0), nothing going on except one user (me) logged in and viewing an index page. The page includes 9 dynamic images drawn from the underlying DB and returned from a controller action. I have got the actual processing time for these images down to 15ms each. Turn on Firebug and watch the page load. What I see is 9 requests for images firing off together – no surprise – but four come back to me almost immediately; two more after 0.5s; another after 1s; then at 1.5s and 2s. Logging on the server side suggests the individual responses are still only taking 15ms. So it appears IIS is queueing things up into 500ms chunks. (Repeating the experiment produces different results, but each time the images return in similar blocks – you might get three in the first group, then three at 0.5s, two at 1s etc, for example – and it’s always at 500ms intervals, not anything else.) It’s also repeatable cross-browser, and it’s not repeatable with other forms of content. I haven't found any particular mention of this problem out there, so I'm sort of assuming it's not an IIS bug, so is it: i) IIS on desktop OSs deliberately does it, to make you use server OSs in production? ii) There is some magical setting that has eluded me for as long as I’ve known IIS? iii) Something peculiar to MVC or SQL Server 2008? or something else?

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• Help setting up an secondary authoritative DNS server.

  - by GLB03

  We have three Authoritative DNS servers and three recursive/caching DNS servers on my campus. Authoritative servers DNS1- Windows 2003 DNS2- Old Red Hat ----- Replacing w/ newer version DNS3- Windows 2008 (I installed) Caching and Recursive resolvers servers Server1- Windows 2003 Server2- CentOS 5.2 (I installed) Server3- CentOS 5.3 (I installed) I am replacing DNS2 with a newer Red Hat version, but have no documentation on how it was implemented. I have setup caching and windows authoritative servers, but not a linux secondary authoritative server. I have a perl script from the original server that pulls data from our DNS1 server. We use DJBDNS and TinyDNS on our linux servers. Our Network Engineer says the DNS2 server I am replacing is an authoritative server that doesn't need to be caching, but the only instructions I see is for an Authoritative server that does caching as well. Can someone point me in the right directions. I thought I was on the right track with using these instructions but when I query my new dns server I get "No response from server", I have temporarily disabled iptables to eliminate it from being an issue. ps -aux | grep dns avahi 3493 0.0 0.2 2600 1272 ? Ss Apr24 0:05 avahi-daemon: running [newdns2.local] root 5254 0.0 0.1 3920 680 pts/0 R+ 09:56 0:00 grep dns root 6451 0.0 0.0 1528 308 ? S Apr29 0:00 supervise tinydns dnslog 6454 0.0 0.0 1540 308 ? S Apr29 0:00 multilog t ./main tinydns 9269 0.0 0.0 1652 308 ? S Apr29 0:00 /usr/local/bin/tinydns

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• Windows 7 Printing Issue

  - by Adrian Godong

  I am using Windows 7 RTM x64. From Control Panel Devices and Printers, I have three printers listed; Fax, XPS Writer, and a Lexmark. I can print a test page through the printer properties with no problem. I can print a text file from Notepad with no problem. I can't print from Safari. When I press Ctrl+P, it displays the Print dialog, press OK and nothing happened. I can't print from Adobe Reader. When I press Ctrl+P, it complains that it there is no printer installed. I can't print from Office applications. When I press Ctrl+P, it crashes immediately. Running Office Diagnostics does not help. I can't print from IE8. When I press Ctrl+P, it displays the Print dialog, complains that I have to select a printer from the list, selected any of the three printers, the Print button is disabled. Any help? Update (01/11/2009): The default printer is the Lexmark. I'm testing on this one as well. I was about to reinstall Office (as this is the first application that has the problem), but then I tried other, some behave similarly but not identical (maybe caused by different printing implementation). On those applications that is able to display printer selection dialog, I tried the Lexmark and XPS. Neither printed anything (paper for Lexmark, file for XPS). Update (01/12/2009): It seems that my Windows installation is botched. A colleague have similar hardware/software combination (it's the same workstation model and Windows 7 x64) and his can print perfectly fine. I tried adding the printer from his share, no joy. I can test print from the printer property, I can print from Notepad, but not from any other application.

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• Can I use multiple URLs in the URL field of KeePass?

  - by Sammy

  I am using KeePass version 2.19. What I would like to do is have more than just one URL address associated with a given user name and password. The entry for a given website might look something like this... Title google User Name email Password pass URL https://accounts.google.com/ServiceLogin?hl=en&continue=https://www.google.com/ https://accounts.google.com/ServiceLogin?hl=sv&continue=https://www.google.com/ https://accounts.google.com/ServiceLogin?hl=de&continue=https://www.google.com/ As you can see the ?hl=en changes into ?hl=sv and then to ?hl=de for the three different languages in which I wish to view the Google log-in page. But this of course could be something completely different, like different web services from the same provider like YouTube and Gmail by Google. Very much like SE where you have several websites but only use one user name and password. I imagine something along the lines of having multiple entries for one and the same website, where KeePass would actually prompt you to choose which one you want to use. So you have several user names and passwords that use the same URL. But is it possible to have several URLs using the same user name and password, so that KeePass asks me "to which of the following three URLs do you want to auto-log into with this password"?

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