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• Restricting memory area for linux kernel

  - by user1066789

  I am running ltib linux on P1022RDK (P1022 Core) platform. I have 512 MB = 0x20000000 memory. I want my linux kernel to use second half of the board memory (i.e from 256 MB to 512 MB) and want first half of memory to be reserved for some other purpose. For this I am building linux kernel using ltib. For that purpose I am setting following kernel configuration. Please suggest if I am doing it the right way. CONFIG_LOWMEM_SIZE = 0x10000000 # 256 MB CONFIG_PHYSICAL_START = 0x10000000 # Starting from 256MB (second half of memory) On the Uboot I am loading the kernel as following way setenv loadaddr 0x11000000 # Kernel base = 0x10000000 + 0x01000000 (offset) setenv fdtaddr 0x10c00000 # Kernel base = 0x10000000 + 0x00c00000 (offset) bootm $loadaddr - $fdtaddr My kernel Load address is 0x10000000 & kernel entry point is 0x10000000 Doing above configuration / steps my kernel stuck at following on Uboot ## Booting kernel from Legacy Image at 11000000 ... Image Name: Linux-2.6.32.13 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3352851 Bytes = 3.2 MB Load Address: 10000000 Entry Point: 10000000 Verifying Checksum ... OK ## Flattened Device Tree blob at 10c00000 Booting using the fdt blob at 0x10c00000 Uncompressing Kernel Image ... OK ================ >> It should uncompress FDT here & continue ============== Any thoughts ?

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• Restricting memory area for linux kernel

  - by user1066789

  I am running ltib linux on P1022RDK (P1022 Core) platform. I have 512 MB = 0x20000000 memory. I want my linux kernel to use second half of the board memory (i.e from 256 MB to 512 MB) and want first half of memory to be reserved for some other purpose. For this I am building linux kernel using ltib. For that purpose I am setting following kernel configuration. Please suggest if I am doing it the right way. CONFIG_LOWMEM_SIZE = 0x10000000 # 256 MB CONFIG_PHYSICAL_START = 0x10000000 # Starting from 256MB (second half of memory) On the Uboot I am loading the kernel as following way setenv loadaddr 0x11000000 # Kernel base = 0x10000000 + 0x01000000 (offset) setenv fdtaddr 0x10c00000 # Kernel base = 0x10000000 + 0x00c00000 (offset) bootm $loadaddr - $fdtaddr My kernel Load address is 0x10000000 & kernel entry point is 0x10000000 Doing above configuration / steps my kernel stuck at following on Uboot ## Booting kernel from Legacy Image at 11000000 ... Image Name: Linux-2.6.32.13 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3352851 Bytes = 3.2 MB Load Address: 10000000 Entry Point: 10000000 Verifying Checksum ... OK ## Flattened Device Tree blob at 10c00000 Booting using the fdt blob at 0x10c00000 Uncompressing Kernel Image ... OK ================ It should uncompress FDT here & continue ============== Any thoughts ?

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• Geographically distributed file system with preferred locality

  - by dpb

  Hi All -- I'm building a application that needs to distribute a standard file server across a few sites over a WAN. Basically, each site needs to write a lot of misc files of varying size (some in the 100s MB range, but most small), and the application is written such that collisions aren't a problem. I'd like to have a system set up that meets the following qualifications: Each site can store files in a shared "namespace". That is, all the files would show up in the same filesystem. Each site would not send data over the WAN unless necessary. I.e., there would be local storage on each side of the WAN that would be "merged" into the same logical filesystem. Linux & Free ($$$) is a must. Basically, something like a central NFS share would meet most of the requirements, however it would not allow the locally written data to stay local. All data from remote sides of the WAN would be copied locally all the time. I have looked into Lustre, and have run some successful tests with it, however, it appears to distribute files fairly uniformly across the distributed storage. I have dug through the documentation and have not found anything that automatically will "prefer" local storage over remote storage. Even something that went with the lowest latency storage would be fine. It would work most of the time, which would meet this application's requirements. Any ideas?

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• Analyze a BSOD (irql_less_than_or_equal)

  - by Bruno Reis

  Hello. About 2 months ago I bought a new system and built it at home: Mother board: XFX X58i Processor: Core i7 920, using the stock cooler Memory: 3x2GB Corsair DDR3 1600 Video card: NVIDIA GTS 250 (1GB) Hard disk: 2x WD 500GB, 7200rpm I have 2 screens plugged into the video card, and the system is connected to a 550W PSU. Nothing is overclocked. After building the system, I stressed it a lot with Prime95 and rthdribl to check its stability. All my tests were perfect. So I reinstalled Win 7 x64 Professional and started using it normally. The first week (2010-03-15) I got the infamous irql_less_than_or_equal BSOD. Ten days after (2010-03-24) I got another one. Then on 2010-04-09, 2010-05-04. Since 2 days ago it became worse: I got one bluescreen per day! (2010-05-12, 2010-05-13, 2010-05-14). I installed BlueScreenView to try to obtain some information, but I'm not able to extract any useful information apart from the bug check string (irql_less_than_or_equal), and that it was caused by ntoskrnl.exe (the first three at ntoskrnl.exe+71f00, the last 4 at ntoskrnl.exe+70600 -- which I suspect could be the same thing, as Microsoft could have patched this file in the mean time, so the address of the function causing it changed). Then I stressed my memory sticks with memtest, they worked perfectly. After booting, I've stressed my GPU with FurMark and RTHDRIBL, everything was fine. Then I stressed the CPU with 4 instances of Prime95 while monitoring the temperature -- that never exceeded 85oC with the case closed --, everything fine. Finally I've stressed the whole system with HeavyLoad for a looooong time, everything worked just fine. So, I have stressed most of the components of the system, but couldn't get any useful information from it. Do you have any hint on what else can I do to find the culprit? Thanks Bruno

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• Creating a tar file with checksums included

  - by wazoox

  Here's my problem : I need to archive to tar files a lot ( up to 60 TB) of big files (usually 30 to 40 GB each). I would like to make checksums ( md5, sha1, whatever) of these files before archiving; however not reading every file twice (once for checksumming, twice for tar'ing) is more or less a necessity to achieve a very high archiving performance (LTO-4 wants 120 MB/s sustained, and the backup window is limited). So I'd need some way to read a file, feeding a checksumming tool on one side, and building a tar to tape on the other side, something along : tar cf - files | tee tarfile.tar | md5sum - Except that I don't want the checksum of the whole archive (this sample shell code does just this) but a checksum for each individual file in the archive. I've studied GNU tar, Pax, Star options. I've looked at the source from Archive::Tar. I see no obvious way to achieve this. It looks like I'll have to hand-build something in C or similar to achieve what I need. Perl/Python/etc simply won't cut it performance-wise, and the various tar programs miss the necessary "plugin architecture". Does anyone know of any existing solution to this before I start code-churning ?

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• How to use multiple variables in time calculator c#

  - by Peter O'Dwyer

  I am building a video time calculator and need to use the number of frames instead of milliseconds. e.g 25FPS HH:MM:SS:FR 00:00:10:24 <-- Last frame of 10 seconds 00:00:11:00 <-- First frame of 11 seconds My problem is that if the start frames are lower than my end frames it can't calculate the time. 00:00:10:05 <-- Start 01:00:10:10 <-- End 00:59:59:05 <-- Answer which I can't get!! HERE'S MY CODE string Startdate = Dur_txtStart.Text; string Enddate = Dur_txtEnd.Text; string Startdate1 = Startdate.Substring(0, 8); int Startframe1 = Convert.ToInt32(Startdate.Substring(9, 2)); string Startdate2 = Enddate.Substring(0, 8); int Startframe2= Convert.ToInt32(Enddate.Substring(9, 2)); TimeSpan diff = DateTime.Parse(Startdate2).Subtract(DateTime.Parse(Startdate1)); int frameDiff = Startframe2 - Startframe1; int Hour = Convert.ToInt32(diff.Hours); int Min = Convert.ToInt32(diff.Minutes); int Sec = Convert.ToInt32(diff.Seconds); if (frameDiff < 0 && Sec > 0) { Sec -= 1; string frameDiffBuild = string.Format("{0}:{1}:{2}:{3}",Hour.ToString("D2"), Min.ToString("D2"), Sec.ToString("D2"), (Convert.ToInt32(Dur_txtFPS.Text + frameDiff)).ToString("D2")); Dur_txtOutTime.Text = frameDiffBuild; } else { string frameDiffBuild = string.Format("{0}:{1}:{2}:{3}",Hour.ToString("D2"), Min.ToString("D2"), Sec.ToString("D2"), frameDiff.ToString("D2")); Dur_txtOutTime.Text = frameDiffBuild; } Hope you can help guys my head is mashed!

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• How to debug a kernel created using ubuntu-vm-builder?

  - by user265592

  Aim: Trying to perform a code walkthrough of what functions are getting called for sending and receiving packets over the network. I am building a kernel and using gdb for debugging/ tracing purposes. I have build a vm using the following command : time sudo ubuntu-vm-builder qemu precise --arch 'amd64' --mem '1024' --rootsize '4096' --swapsize '1024' --kernel-flavour 'generic' --hostname 'ubuntu' --components 'main' --name 'Bob' --user 'ubuntu' --pass 'ubuntu' --bridge 'br0' --libvirt 'qemu:///system' And I can run the VM successfully in qemu using the following command: qemu-system-x86_64 -smp 1 -drive file=tmpGgEOzK.qcow2 "$@" -net nic -net user -serial stdio -redir tcp:2222::22 Now, I want to debug the kernel using gdb. For this I need an executable with debug symbols(vmlinux), which apparently I don't have, as the vm-builder never asked for any such options and simply created a .qcow2 file. Question 1: Am I taking the correct approach to solve the problem and is there an easier way to do it? Question 2: Is there a way to debug this kernel using GDB? P.S: I don't have hardware support for KVM. Please correct me if I am wrong. Thanks.

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• Cannot install mercurial properly - PYTHONPATH error

  - by evident

  Hi, I have a server running on Ubuntu 10.04 on which I wanted to install Mercurial via % sudo apt-get install mercurial It seems to have installed successfully and doesn't show me any error messages. But when I try it I get: % hg abort: couldn't find mercurial libraries in [/usr/bin /usr/lib/python2.6 /usr/lib/python2.6/plat-linux2 /usr/lib/python2.6/lib-tk /usr/lib/python2.6/lib-old /usr/lib/python2.6/lib-dynload /usr/lib/python2.6/dist-packages /usr/lib/pymodules/python2.6 /usr/local/lib/python2.6/dist-packages] (check your install and PYTHONPATH) I've googled for a while now and found some sites with the same problem but I still have no idea on how to fix it since it nowhere really says what I need to look for or what I need to add to my PYTHONPATH... By the way, right now my PYTHONPATH seems to be empty: % echo $PYTHONPATH % This is what I get if I look into my /usr/lib/ directory for mercurial: % find /usr/lib/py* -name 'mercurial*' /usr/lib/pymodules/python2.6/mercurial /usr/lib/pymodules/python2.6/mercurial-1.4.3.egg-info /usr/lib/pyshared/python2.6/mercurial Can anybody please help me with that? What (and how) should I set my PYTHONPATH to? I already tried reinstalling, installing with "easy_install mercurial" or with "aptitude reinstall mercurial" but nothing helped. I always get this same error. Would be great if anyone could help... thanks! ADDITION: Building from scratch didn't work out well... when I am logged in as root I can use hg, but when I access with my normal user I get: % hg Traceback (most recent call last): File "/usr/local/bin/hg", line 4, in <module> import pkg_resources File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 2659, in <module> parse_requirements(__requires__), Environment() File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 546, in resolve raise DistributionNotFound(req) pkg_resources.DistributionNotFound: mercurial==1.7.2

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• Campus VLAN Segmentation - By OS?

  - by Moduspwnens

  We've been thinking through re-arranging our network and VLAN configuration. Here's the situation. We already have our servers, VoIP phones, and printers on their own VLANs, but our problem lies with end user devices. There are just too many to lump on the same VLAN without being hammered with broadcasts! Our current segmentation strategy has them split into VLANs like this: Student iPads Staff iPads Student Macbooks Staff Macbooks Gaming devices Staff (Other) Student (Other) *Note that our network has many more iPads and MacBooks than most. Since the primary reason we're splitting them is just to put them in smaller groups, this has been working for us (for the most part). However, this required our staff to maintain access control lists (MAC addresses) of all devices belonging in these groups. It also has the unfortunate side effect of illogically grouping broadcast traffic. For example, using this setup, students on opposite ends of campus using iPads will share broadcasts, but two devices belonging to the same user (in the same room) will likely be on completely separate VLANs. I feel like there must be a better way of doing this. I've done a lot of research and I'm having trouble finding instances of this kind of segmentation being recommended. The feedback on the most relevant SO question seems to point toward VLAN segmentation by building/physical location. I feel like that makes sense because logically, at least among miscellaneous end users, broadcasts will typically be intended for nearby devices. Are there other campuses/large-scale networks out there segmenting VLANs based on end-system OS? Is this a typical configuration? Would VLAN segmentation based on physical location (or some other criteria) be more effective? EDIT: I've been told that we will soon be able to dynamically determine device OS without maintaining access lists, although I'm not sure how much that affects the answers to the questions.

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• installing Conkeror on Ubuntu 12.04

  - by Menelaos Perdikeas

  I am reading the instructions on conkeror site (and elsewhere) on how to install conkeror on Ubuntu (I am using Ubuntu 12_04 LTS) and it seems that the correct sequence is: sudo apt-add-repository ppa:xtaran/conkeror sudo apt-get update sudo apt-get install conkeror conkeror-spawn-process-helper The first step (apt-add-repository) seems to execute without a problem, giving the following output: You are about to add the following PPA to your system: Conkeror Debian packages for Ubuntu releases without xulrunner (i.e. for 11.04 Natty and later) More info: https://launchpad.net/~xtaran/+archive/conkeror Press [ENTER] to continue or ctrl-c to cancel adding it Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret- keyring /tmp/tmp.Re7pWaDEQF --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80/ --recv CB29CBE050EB1F371BAB6FE83BE0F86A6D689050 gpg: requesting key 6D689050 from hkp server keyserver.ubuntu.com gpg: key 6D689050: "Launchpad PPA for Axel Beckert" not changed gpg: Total number processed: 1 gpg: unchanged: 1 However, the apt-get update seems unable to fetch packages from the newly added PPA, with its output ending in: Hit http://security.ubuntu.com precise-security/restricted Translation-en Hit http://security.ubuntu.com precise-security/universe Translation-en Err http://ppa.launchpad.net precise/main Sources 404 Not Found Ign http://extras.ubuntu.com precise/main Translation-en_US Err http://ppa.launchpad.net precise/main i386 Packages 404 Not Found Ign http://extras.ubuntu.com precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en W: Failed to fetch http://ppa.launchpad.net/xtaran/conkeror/ubuntu/dists/precise /main/source/Sources 404 Not Found W: Failed to fetch http://ppa.launchpad.net/xtaran/conkeror/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. Accordingly, apt-get-install conkeror fails with: mperdikeas@mperdikeas:~$ sudo apt-get install conkeror Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package conkeror Any ideas what might be wrong ?

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• Dependencies problems installing openjdk on Ubuntu

  - by Rodnower

  I try to install openjdk-7-jre: sudo apt-get install openjdk-7-jre But I have dependencies problems: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: openjdk-7-jre : Depends: openjdk-7-jre-headless (= 7u7-2.3.2a-0ubuntu0.12.04.1) but it is not going to be installed Depends: libgif4 (>= 4.1.4) but it is not installable Depends: libatk-wrapper-java-jni (>= 0.30.4-0ubuntu2) but it is not installable Recommends: libgnome2-0 but it is not installable Recommends: libgnomevfs2-0 but it is not going to be installed Recommends: ttf-dejavu-extra but it is not installable E: Unable to correct problems, you have held broken packages. This is version of Ubuntu: Ubuntu 12.04.1 LTS I completely don't know how resolve dependencies... Some one can help me? Thank you for ahead.

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• Distributed File Systems.

  - by GruffTech

  So, I've been reading several articles around ServerFault as well as google. (For Example, this link) My Requirements are very similar to the link above, however i'd like to also have dynamic or at least resizeable file volumes, so if necessary i can add 4-5 servers to the pool, and then expand the volume. Any Distributed File systems that support that, to save me some time? Thanks! LustreFS will be my next test cluster to build. GlusterFS I've build a 3-machine test GlusterFS cluster, However i quickly became aware of several of its limitations that it doesn't seem to make clearly public. One, i can't seem to resize a volume. Once a volume is created, its done. Which seems retarded, why have a fully scalable file system if i can't scale a volume? So maybe i'm doing something wrong. I'm not sure. AmazonS3 while gives the cheapest startup adds too much cost when broken down to per client per month, so its out. Building my own system when prorated over several years with no bandwidth costs makes it significantly cheaper. MogileFS isn't an option as we'd like this server to be a SAN-Replacement, for storing tons of media from a multitude of systems, which for us means it needs to be POSIX compliant so it can be remotely mounted via NFS or CIFS.

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• apt-get : Size mismatch

  - by Cédric Girard

  I created a private deb repository to spread a software and it's updates to 600 Ubuntu netbooks. Each time the network is connected, my script try to do a apt-get update. But sometimes (quite often in fact), I have this : Failed to fetch https://myserver/ubuntu/dists/maverick/main/binary-i386/voosicomat.deb Size mismatch The server is an 2.2 Apache, HTTPS only. There is no error on it's logs. Here is the script : apt-get update apt-get dist-upgrade --force-yes --yes Here is the complete output of apt-get Ign https://myserver maverick Release.gpg Ign https://myserver/ubuntu/ maverick/main Translation-en Ign https://myserver maverick Release Ign https://myserver maverick/main i386 Packages/DiffIndex Ign https://myserver maverick/main i386 Packages Ign https://myserver maverick/main i386 Packages Hit https://myserver maverick/main i386 Packages Reading package lists... Reading package lists... Building dependency tree... Reading state information... The following packages will be upgraded: majdb utilitaires voosicomat 3 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 6207kB/6273kB of archives. After this operation, 0B of additional disk space will be used. WARNING: The following packages cannot be authenticated! utilitaires voosicomat majdb Get:1 https://myserver/ubuntu/ maverick/main voosicomat all 2.0.1 [4755kB] Get:2 https://myserver/ubuntu/ maverick/main majdb all 1.0.17 [1452kB] Failed to fetch https://myserver/ubuntu/dists/maverick/main/binary-i386/voosicomat.deb Size mismatch Fetched 7091kB in 21s (324kB/s) E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? Regards Cédric

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• HAProxy is caching the forwarding?

  - by shadow_of__soul

  i'm trying to set up a server structure for an application i'm building in Node.js with socket.io. My setup is: HAProxy frontend forward to -> apache2 as default backend (or nginx, is apache in this local test) -> node.js app if the url has socket.io in the request AND a domain name i have something like: global log 127.0.0.1 local0 log 127.0.0.1 local1 notice maxconn 4096 user haproxy group haproxy daemon defaults log global mode http maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 frontend all 0.0.0.0:80 timeout client 5000 default_backend www_backend acl is_soio url_dom(host) -i socket.io #if the request contains socket.io acl is_chat hdr_dom(host) -i chaturl #if the request comes from chaturl.com use_backend chat_backend if is_chat is_soio backend www_backend balance roundrobin option forwardfor # This sets X-Forwarded-For timeout server 5000 timeout connect 4000 server server1 localhost:6060 weight 1 maxconn 1024 check #forwards to apache2 backend chat_backend balance roundrobin option forwardfor # This sets X-Forwarded-For timeout queue 50000 timeout server 50000 timeout connect 50000 server server1 localhost:5558 weight 1 maxconn 1024 check #forward to node.js app The problem comes when i made a request to something like www.chaturl.com/index.html it load perfectly but fails to loads the socket.io files (www.chaturl.com/socket.io/socket.io.js) why it redirect to apache (and should redirect to the node.js app that serve the files). The weird thing is that if i access directly to the socket.io file, after refreshing a few times, it loads, so i suppose is "caching" the forwarding for the client when it makes the first request and reach the apache server. Any suggestion of how this can be solved? or what i can try or look about this?

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• Azure's Ubuntu 12.0.4 fails to install PHP5

  - by Alex Kennberg

  Similar to this article from Azure themselves: http://www.windowsazure.com/en-us/manage/linux/common-tasks/install-lamp-stack/ I am trying to install PHP5 on Ubuntu 12.0.4 virtual machine. However, it fails installing the ssl-cert. $ sudo apt-get install php5 Reading package lists... Done Building dependency tree Reading state information... Done php5 is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 49 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? y Setting up ssl-cert (1.0.28) ... Could not create certificate. Openssl output was: Generating a 2048 bit RSA private key ............................+++ ...................................................................................................................+++ writing new private key to '/etc/ssl/private/ssl-cert-snakeoil.key' ----- problems making Certificate Request 140320238503584:error:0D07A097:asn1 encoding routines:ASN1_mbstring_ncopy:string too long:a_mbstr.c:154:maxsize=64 dpkg: error processing ssl-cert (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: ssl-cert E: Sub-process /usr/bin/dpkg returned an error code (1) Any tips appreciated.

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• Network Misconfiguration when adding first host to new vSphere cluster

  - by dunxd

  I am building a new vSphere cluster from scratch. I have installed ESXi on the first host, and built a vCenter server on a VM residing on that host (storage is on the local hard drive, although we have iSCSI targets which I can reach from the host). The cluster is configured for HA. When I try and add the host to the cluster, I get an error at the point where HA is configured - Cannot complete the . I have stripped the network configuration of the host down to the most basic - a single NIC attached to a single vSwitch - this is running the VMKernel Port on VLAN 8 - that is our Management VLAN. The vCenter server will have a network address on this VLAN, so I also set the initial Virtual Machine Port Group to this VLAN, and connected the vCenter server NIC to this port group. I understand I can't connect the vCenter server to the VMkernel port group, but shouldn't I be able to connect the vCenter server to a Port Group in the same VLAN? If not, do I need to create a VLAN specifically for VMKernel Port Group? I plan to set up another port group for vMotion with a dedicated and isolated VLAN (i.e. VLAN isn't routed) so this wouldn't allow vCenter to communicate. Does anyone have any suggestions, or other ideas for what might be causing the problem. I've read through the documentation, but it isn't giving me any pointers, and the error message isn't helping me beyond telling me something is wrong with my network config.

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• Is encryption really needed for having network security? [closed]

  - by Cawas

  I welcome better key-wording here, both on tags and title. I'm trying to conceive a free, open and secure network environment that would work anywhere, from big enterprises to small home networks of just 1 machine. I think since wireless Access Points are the most, if not only, true weak point of a Local Area Network (let's not consider every other security aspect of having internet) there would be basically two points to consider here: Having an open AP for anyone to use the internet through Leaving the whole LAN also open for guests to be able to easily read (only) files on it, and even a place to drop files on Considering these two aspects, once everything is done properly... What's the most secure option between having that, or having just an encrypted password-protected wifi? Of course "both" would seem "more secure". But it shouldn't actually be anything substantial. I've always had the feeling using any kind of the so called "wireless security" methods is actually a bad design. I'm talking mostly about encrypting and pass-phrasing (which are actually two different concepts), since I won't even consider hiding SSID and mac filtering. I understand it's a natural way of thinking. With cable networking nobody can access the network unless they have access to the physical cable, so you're "secure" in the physical way. In a way, encrypting is for wireless what building walls is for the cables. And giving pass-phrases would be adding a door with a key. So, what do you think?

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• Microsoft Application Request Routing with Windows Authentication

  - by theplatz

  I'm running into a problem trying to get Windows Authentication working in an environment that uses Microsoft Application Request Routing and was hoping someone might be able to help. The problem I'm running into is that only some requests are authenticated, while others fail with 401 errors. I have followed the Special Case of Running IIS 7.0 in a Web Farm instructions found at http://blogs.msdn.com/b/webtopics/archive/2009/01/19/service-principal-name-spn-checklist-for-kerberos-authentication-with-iis-7-0.aspx to no avail. My current server setup looks like the following: ARR Two servers set up with IIS shared configuration using IIS 7.5 on Windows 2008 R2 Anonymous authentication turned on for the Default Web Site Web Farm Two servers running IIS 7.5 on Windows 2008 R2 Three web sites set up using port binding to differentiate between virtual hosts. Ports being used are 8000, 8001, and 8002 Application pools for Windows Authentication all use a common domain account SPN added to domain account for http/<virthalhost-name>:<port-number> and http/<virtualhost-name>.<fully-qualified-domain>:<port-number> The IIS logs show the following when authentication is working/failing. If I understand correctly, all requests should show DOMAIN\User_Name: 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/stylesheets/techweb.landing.css - 8002 DOMAIN\User_Name ARR-HOST-1-IP-ADDRESS 200 0 0 62 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-background-right.gif - 8002 - ARR-HOST-1-IP-ADDRESS 401 2 5 0 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-background-left.gif - 8002 DOMAIN\User_Name ARR-HOST-IP-ADDRESS 200 0 0 31 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-icon.png - 8002 - ARR-HOST-1-IP-ADDRESS 401 2 5 0 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-icon.png - 8002 - ARR-HOST-1-IP-ADDRESS 401 1 2148074248 0 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/application-icon.png - 8002 - ARR-HOST-1-IP-ADDRESS 401 1 2148074248 0 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-background-right.gif - 8002 - ARR-HOST-1-IP-ADDRESS 401 1 3221225581 15 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/building.gif - 8002 DOMAIN\User_Name ARR-HOST-2-IP-ADDRESS 200 0 0 218 Does anyone know what might cause this problem and how I can resolve it?

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• How to get automatic upgrades to work on Ubuntu Server?

  - by J. Pablo Fernández

  I followed the documentation for enabling automatic upgrades in Ubuntu servers, but it's not really updating anything at all. My /etc/apt/apt.conf.d/50unattended-upgrades looks almost like the default. // Automatically upgrade packages from these (origin, archive) pairs Unattended-Upgrade::Allowed-Origins { "Ubuntu karmic-security"; "Ubuntu karmic-updates"; }; // List of packages to not update Unattended-Upgrade::Package-Blacklist { // "vim"; // "libc6"; // "libc6-dev"; // "libc6-i686"; }; // Send email to this address for problems or packages upgrades // If empty or unset then no email is sent, make sure that you // have a working mail setup on your system. The package 'mailx' // must be installed or anything that provides /usr/bin/mail. Unattended-Upgrade::Mail "[email protected]"; // Automatically reboot *WITHOUT CONFIRMATION* if a // the file /var/run/reboot-required is found after the upgrade //Unattended-Upgrade::Automatic-Reboot "false"; The directory /var/log/unattended-upgrades/ is empty. Running /etc/init.d/unattended-upgrades start is not very nice: root@mozart:~# /etc/init.d/unattended-upgrades start Checking for running unattended-upgrades: root@mozart:~# Something seems to be broken, but I'm not sure why. I have pending updates and they are not being applied: root@mozart:~# aptitude safe-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Reading extended state information Initializing package states... Done The following packages will be upgraded: linux-libc-dev 1 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 0B/743kB of archives. After unpacking 4096B will be used. Do you want to continue? [Y/n/?] In all the servers I have, unattended upgrades seems to have been disabled: root@mozart:~# apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade root@mozart:~# Any ideas what am I missing?

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• How to move Mdadm RAID drive (EBS based) to different AWS Instance

  - by Stanley

  We have a media-rich web application that is hosted on AWS. We have several Web Servers and we have an NFS server. On the NFS server (Linux server) we have several EBS volumes that are mounted and we've used mdadm to implement the different mounted volumes as a single RAID volume. The Web Servers simply access the NFS storage through a mount point. Amazon has now let us know that they will be performing power maintenance on this server in a couple of days time. Since all our media is on here it would render our site unusable for the hours while Amazon is working on it. We want to try and prevent this downtime. I was thinking that we can prevent server downtime by perhaps setting up a new server temporarily and attaching the EBS drives (raid volume) to that server and have our web servers point there during maintenance. This is a very high risk operation since this involves several terabytes of our production data. What would be the safe way to move over our logical raid drive (md0) to a new amazon instance? I was hoping that I could start with building the new server, mounting the ebs volumes and assembling the RAID partition using mdadm --assemble --scan before unmounting from the existing instance so that I can first test that everything works and thus having it mounted on two instances at the same time, but I don't believe that is possible with the way that filesystems work. How do I move a Linux software RAID to a new machine? suggests a way to move drives, but isn't really a cloud-based question. Perhaps there are simpler ways to prevent system downtime with our solution being hosted on the cloud? I have considered taking an EBS snapshot, but that tries to replicate all the many terabytes of mounted storage, so this is not a practical solution. Any ideas?

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• Can I get ethernet out of my Verizon FIOS set-top box?

  - by Tom Hughes

  Setup: my home network is long & skinny, and the FIOS-connected router is all the way at one of the apartment. At the other end, far away (and a floor higher) is my HD TV, which gets a cable-TV signal from a Verizon set-top box that is coax-connected back to the FIOS on-premises equipment. Wi-Fi won't work, the apartment is too stretched out, with old, thick walls and floors. Goal: I think there are three ways to get ethernet back to where the HD TV is: 1) run a cable! this isn't crazy but isn't cheap either (my building won't let me do it, it involves hiring an electrician because the cable would run partly through the public hallway ceiling) 2) split the coax near the TV and put in... a MoCA device? 3) somehow tease the set-top box, which has an RJ-11 (ethernet) port on the back, to give me network access. Question: any other choices? and, is one choice better than the others? #3 is by far the most desirable because it would involve the least wiring -- but I can't find any resources to help make it happen. #2 is a bit scary, I don't want to degrade service to the TV or anywhere else for that matter.

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• Where to get glib-config for Kubuntu?

  - by Carl Smotricz

  I'm trying to compile Midnight Commander on a KUbuntu 9.10 (Karmic) box with no root access. I've set up a directory under $HOME, downloaded the mc source package and various stuff required for building, such as autotools. I've unpacked the CONTENTS of all those packages into this working directory such that I have the usual ./usr, ./lib, ./etc hierarchy. I manage to get configure through a lot of tests, but I can't seem to fool it into finding glib. checking for glib-2.0... checking for glib-config... no checking for glib12-config... no checking for glib-config... no checking for GLIB - version >= 1.2.6... no *** The glib-config script installed by GLIB could not be found *** If GLIB was installed in PREFIX, make sure PREFIX/bin is in *** your path, or set the GLIB_CONFIG environment variable to the *** full path to glib-config. configure: error: Test for glib failed. GNU Midnight Commander requires glib 1.2.6 or above. My system has glib installed: /lib/libglib-2.0.so.0 /lib/libglib-2.0.so.0.2200.3 ... and I've also downloaded and unpacked the glib package into my working directory: libglib2.0-0_2.22.2-0ubuntu1_i386.deb libglib2.0-dev_2.22.2-0ubuntu1_i386.deb ... but still the elusive glib-config is nowhere to be found. It's not in any debian package for Karmic, either. So I'd appreciate any help getting over this hurdle. Please note, again, that I don't have root, so I can't just merrily apt-get stuff.

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• Jenkins shell command isn't executing

  - by Dmitro

  In Jenkins project I add command for executiong rm /var/www/ru.liveyurist.ru/tmp/* But when I build project I get error: Started by user anonymous Building in workspace /var/www/ru.myproject.ru Updating https://subversion.assembla.com/svn/myproject/trunk At revision 1168 no change for https://subversion.assembla.com/svn/liveexpert/trunk since the previous build [ru.myproject.ru] $ /bin/sh -xe /tmp/hudson7189633355149866134.sh FATAL: command execution failed java.io.IOException: Cannot run program "/bin/sh" (in directory "/var/www/ru.myproject.ru"): java.io.IOException: error=12, Cannot allocate memory at java.lang.ProcessBuilder.start(ProcessBuilder.java:475) at hudson.Proc$LocalProc.<init>(Proc.java:244) at hudson.Proc$LocalProc.<init>(Proc.java:216) at hudson.Launcher$LocalLauncher.launch(Launcher.java:709) at hudson.Launcher$ProcStarter.start(Launcher.java:338) at hudson.Launcher$ProcStarter.join(Launcher.java:345) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:82) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:58) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19) at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:703) at hudson.model.Build$RunnerImpl.build(Build.java:178) at hudson.model.Build$RunnerImpl.doRun(Build.java:139) at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:473) at hudson.model.Run.run(Run.java:1410) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:238) Caused by: java.io.IOException: java.io.IOException: error=12, Cannot allocate memory at java.lang.UNIXProcess.<init>(UNIXProcess.java:164) at java.lang.ProcessImpl.start(ProcessImpl.java:81) at java.lang.ProcessBuilder.start(ProcessBuilder.java:468) ... 16 more Build step 'Execute shell' marked build as failure Finished: FAILURE I started Jenkins from root user. Please advise what can be reason of this error?

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• Cannot install git-core using macports

  - by robUK

  Hello, Snow Leopard 10.6.4 mac ports 1.9.1 I have just installed macports and I want to install git-core. However, I get the following errors: ---> Computing dependencies for git-core ---> Dependencies to be installed: python26 db46 gdbm readline sqlite3 rsync popt ---> Building db46 Error: Target org.macports.build returned: shell command failed Log for db46 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_databases_db46/main.log Error: The following dependencies failed to build: python26 db46 gdbm readline sqlite3 rsync popt Error: Status 1 encountered during processing. To report a bug, see <http://guide.macports.org/#project.tickets> I have tried doing a port selfupdate and a port clean all and then trying to install again. But still get the same problem. I have also tried install the dependent db46 on its own. Here is the log message: :error:build Target org.macports.build returned: shell command failed :debug:build Backtrace: shell command failed while executing "command_exec build" (procedure "portbuild::build_main" line 8) invoked from within "$procedure $targetname" :info:build Warning: the following items did not execute (for db46): org.macports.activate org.macports.build org.macports.destroot org.macports.install This is my first time using mac ports. Many thanks for any suggestions.

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• Problem with setting up raid5 on Freenas, Please help.

  - by Benjy23

  Hey Guys, I've been running Freenas for awhile now. Hardware is 1.8celeron Ram 1GB Sata Card is Via - not sure the model.... its 2 ports and I have 6 x 1.5TB HDs All ran ok while running on 1.5TB, no raid. I'm now trying to create a raid5 with my 6 hds. Software raid... is it normal for it to take roughly up to 2 weeks just to build the raid? Sorry, I'm very new to implementing raid and googling doesn't tell much other than it takes a long time. Also the Raid building process seems to fail many times... going to degraded. I suspect its cos 4 of my HDs are connected to my motherboard and the other 2 are connected to my sata card...what's your take? I'm considering 2 options now... either get a 8 port sata card and attach all the HDs to it. Or get a raid controller 8 portcard which is probably gonna be more pricey... also how do you access hardware raid through Freenas? I like how Freenas emails you should your harddrive fails so can this be done as well with hardware raid? Thanks in advance guys.

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