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• Update git on mac

  - by Meltemi

  I can't remember how I installed git a while back....but now it's living in /usr/bin/git and needs to be updated. I don't care how (pre-compiled or build my own) but what I don't want is another version existing somewhere else. i vaguely remember curl(ing) down the source & compiling it. but not positive. anyway, what's the easiest way to keep Git up-to-date under Mac OS X? Side question: I'm not that familiar with git. once it's installed is it ENTIRELY contained within its directory? so, in my case, everything about git on my machine (excluding the actual code repositories of course) is in /usr/bin/git/ ? If so then can I just move git around with a simple mv -R /usr/bin/git /opt/git? Then update my $PATH and everything should work as before? if so then i supposed i could just install again by any method and to any directory...and then move the new one into /usr/bin replacing the old version?!? Or is this bad?

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• An easily customizable linux distribution using minimal disk space?

  - by Frank

  I'm looking for a linux distribution that can be easily used to create my own distribution that's the same system with some software installed. So basically I should be able to create an iso which, when installed, will have the linux distribution with my desired installed. More specifically, I plan on installing mysql and a bit of my own software which shouldn't be too big. However, this distribution needs to be extremely small in terms of disk space. The distribution, including mysql should not exceed 100mb. It should, of course still be able to connect to the internet and perform other standard functions. I don't need X/any sort of window manager, and would prefer not to have it since it would increase disk usage. Currently I have tried ttylinux and tiny core linux. I've found that ttylinux, while is extremely small, has almost nothing so that mysql can't even be installed. Tiny core linux, on the other hand is a bit too big. I've found openembedded and linux from scratch, but I would prefer for the install and build process to be much easier. What other distribution would you recommend for my purposes? Minimizing disk usage is the most important, followed by ease of installing and creating the custom distribution.

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• DEB: "Provides:" field ignored

  - by Creshal

  I need to replace a package with a custom one, which gets its own name (foo-origpackage). To allow it to be used as drop-in replacement, I added the Provides: origpackage line to the control file. apt-cache show foo-origpackage lists the "Provides" entry just fine. However, when I want to install a file depending on origpackage, it fails ("Package origpackage not installed"). Is there some distinction between "real" and virtual packages I'm missing? EDIT: To be precise, what I want to replace is xen-utils-common for Squeeze. My tao-xen-utils-common has the following control file: Source: tao-xen-utils-common Section: kernel Priority: optional Maintainer: Creshal <[email protected]> Build-Depends: debhelper Standards-Version: 3.8.0 Homepage: http://tao.at Package: tao-xen-utils-common Architecture: all Depends: gawk, lsb-base, udev, xenstore-utils, tao-firewall Provides: xen-utils-common Conflicts: xen-utils-common Replaces: xen-utils-common Description: Xen administrative tools - common files (modified) The userspace tools to manage a system virtualized through the Xen virtual machine monitor. Modified for use with TAO Firewall. Installing xen-utils-4.0 fails, however: foo@bar# apt-cache showpkg tao-xen-utils-common Package: tao-xen-utils-common Versions: 4.0.0-1tao1 (/var/lib/apt/lists/repo.tao.at_dists_stable_main_binary-amd64_Packages) (/var/lib/dpkg/status) Description Language: File: /var/lib/apt/lists/repo.tao.at_dists_stable_main_binary-amd64_Packages MD5: 7c2503f563fca13b33b4eb3cbcb3c129 Reverse Depends: tao-firewall,tao-xen-utils-common tao-firewall,tao-xen-utils-common Dependencies: 4.0.0-1tao1 - gawk (0 (null)) lsb-base (0 (null)) udev (0 (null)) xenstore-utils (0 (null)) tao-firewall (0 (null)) xen-utils-common (0 (null)) xen-utils-common (0 (null)) Provides: 4.0.0-1tao1 - xen-utils-common Reverse Provides: foo@bar# apt-get install xen-utils-4.0 Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: xen-utils-common Suggested packages: xen-docs-4.0 The following packages will be REMOVED: tao-xen-utils-common The following NEW packages will be installed: xen-utils-4.0 xen-utils-common Edit:foo@bar# apt-cache policy xen-utils-4.0 xen-utils-4.0: Installed: (none) Candidate: 4.0.1-4 Version table: 4.0.1-4 0 500 http://ftp.at.debian.org/debian/ stable/main amd64 Packages 4.0.1-4 0 500 http://security.debian.org/ stable/updates/main amd64 Packages

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• Squid SSL transparent proxy - SSL_connect:error in SSLv2/v3 read server hello A

  - by larryzhao

  I am trying to setup a SSL proxy for one of my internal servers to visit https://www.googleapis.com using Squid, to make my Rails application on that server to reach googleapis.com via the proxy. I am new to this, so my approach is to setup a SSL transparent proxy with Squid. I build Squid 3.3 on Ubuntu 12.04, generated a pair of ssl key and crt, and configure squid like this: http_port 443 transparent cert=/home/larry/ssl/server.csr key=/home/larry/ssl/server.key And leaves almost all other configurations default. The authorization of the dir that holds key/crt is drwxrwxr-x 2 proxy proxy 4096 Oct 17 15:45 ssl Back on my dev laptop, I put <proxy-server-ip> www.googleapis.com in my /etc/hosts to make the call goes to my proxy server. But when I try it in my rails application, I got: SSL_connect returned=1 errno=0 state=SSLv2/v3 read server hello A: unknown protocol And I also tried with openssl in cli: openssl s_client -state -nbio -connect www.googleapis.com:443 2>&1 | grep "^SSL" SSL_connect:before/connect initialization SSL_connect:SSLv2/v3 write client hello A SSL_connect:error in SSLv2/v3 read server hello A SSL_connect:error in SSLv2/v3 read server hello A Where did I do wrong?

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• Attempting to bootstrap and getting weird errors

  - by miah

  I'm on a new computer(mac 10.9.2) and I am attempting to bootstrap my companies project, but setuptools is failing. I can run python bootstrap.py, which creates the ./bin/buildout, but when I run the buildout, it returns the following error: Traceback (most recent call last): File "./bin/buildout", line 17, in <module> import zc.buildout.buildout File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/buildout.py", line 40, in <module> import zc.buildout.download File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/download.py", line 20, in <module> from zc.buildout.easy_install import realpath File "/Users/miah/Documents/realmassive/joson/eggs/zc.buildout-1.7.1-py2.7. egg/zc/buildout/easy_install.py", line 29, in <module> import setuptools.archive_util File "build/bdist.macosx-10.9-intel/egg/setuptools/archive_util.py", line 15, in <module> ImportError: cannot import name ContextualZipFile I've attempted installing it via https://pypi.python.org/pypi/setuptools#unix-including-mac-os-x-curl and homebrew.

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• Computer locking up, looking for bootable hardware diagnostic tool.

  - by Carl Menke

  Well today I helped my friend build a computer. All went pretty well until we got to installing Win7. Thing is, we thought, it was crashing constantly. I adjusted pretty much every setting in the BIOS and removed as much hardware as possible to try and prevent a crash. No dice. So far I've tried running an Ubuntu live cd without the harddrive installed. Nope, crashed on boot. And then I just tried Microsoft's ram utility disk and it eventually locked up on that (the ram passed though). So it seems to me like it's either the CPU (AMD PhenomII x3) or the motherboard that could be bad, but I don't know how to test them individually for problems. I thought it could be a overheating issue, but the BIOS reports that the CPU temp is fine idling around 34C. Any advice or diagnostic disk that could help me out? TL;DR: Computer locks up frequently during use (cannot even boot/install an operating system), memory is fine, probably CPU or Mobo, BIOS says CPU temps are fine. What should I try?

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• How can I run Gnome or KDE locally in Cygwin?

  - by John Peter Thompson Garcés

  Apparently it is possible to do this using cygwin ports, as can be seen in screenshots. I followed this how-to to get apt-cygports set up, and I used it to install gnome-session. This how-to supposedly gives the commands needed to run Gnome or KDE, but whenever I try to run Gnome, a blank X-window pops up and then quickly disappears. Here is the terminal output: $ startx /usr/bin/dbus-launch gnome-session xauth: file /home/jpthomps/.serverauth.4168 does not exist Welcome to the XWin X Server Vendor: The Cygwin/X Project Release: 1.10.3.0 OS: Windows 7 Service Pack 1 [Windows NT 6.1 build 7601] (WoW64) Package: version 1.10.3-12 built 2011-08-22 XWin was started with the following command line: /usr/bin/X :0 -auth /home/jpthomps/.serverauth.4168 (II) xorg.conf is not supported (II) See http://x.cygwin.com/docs/faq/cygwin-x-faq.html for more information LoadPreferences: /home/jpthomps/.XWinrc not found LoadPreferences: Loading /etc/X11/system.XWinrc LoadPreferences: Done parsing the configuration file... winDetectSupportedEngines - DirectDraw installed, allowing ShadowDD winDetectSupportedEngines - Windows NT, allowing PrimaryDD winDetectSupportedEngines - DirectDraw4 installed, allowing ShadowDDNL winDetectSupportedEngines - Returning, supported engines 0000001f winSetEngine - Using Shadow DirectDraw NonLocking winScreenInit - Using Windows display depth of 32 bits per pixel winFinishScreenInitFB - Masks: 00ff0000 0000ff00 000000ff Screen 0 added at virtual desktop coordinate (0,0). MIT-SHM extension disabled due to lack of kernel support XFree86-Bigfont extension local-client optimization disabled due to lack of shared memory support in the kernel (II) AIGLX: Loaded and initialized /usr/lib/dri/swrast_dri.so (II) GLX: Initialized DRISWRAST GL provider for screen 0 winPointerWarpCursor - Discarding first warp: 637 478 (--) 5 mouse buttons found (--) Setting autorepeat to delay=500, rate=31 (--) Windows keyboard layout: "00000409" (00000409) "US", type 4 (--) Found matching XKB configuration "English (USA)" (--) Model = "pc105" Layout = "us" Variant = "none" Options = "none" Rules = "base" Model = "pc105" Layout = "us" Variant = "none" Options = "none" winBlockHandler - pthread_mutex_unlock() winProcEstablishConnection - winInitClipboard returned. winClipboardProc - DISPLAY=:0.0 winClipboardProc - XOpenDisplay () returned and successfully opened the display. xinit: XFree86_VT property unexpectedly has 0 items instead of 1 xinit: connection to X server lost waiting for X server to shut down winClipboardProc - winClipboardFlushWindowsMessageQueue trapped WM_QUIT message, exiting main loop. winClipboardProc - XDestroyWindow succeeded. winClipboardProc - Clipboard disabled - Exit from server winDeinitMultiWindowWM - Noting shutdown in progress

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• DD-WRT (WRT54G) and (THOMSON TG782) how to put them togather?

  - by FeRtoll

  Ok so let me explain, i bought WRT54G and successfully installed DD-WRT v24-sp1 (07/26/08) mini-special - build 9994. That's all ok no problems with it all normal functioning. And just to add (i don't need wireless, wireless is turned off always) What i want: ISP's router (TG782) from it's INTERNET port(out) cable "which was before in my pc" is connected to WRT54G's INTERNET port and then from WRT54G LAN port 1 to my pc. The problem: How do i connect and setup all? I have tried many times on many different ways but cant get it to work IF THE CABLE FROM TG782 IS CONNECTED TO WRT54G ON INTERNET PORT. If i connect the TG782 to Lan port 1 on WRT54G and my pc to lan port 2 then all works fine after i setup gateway and all. But i want to connect TG782 to Internet port of WRT54G because i need "Access Restrictions" and this only goes through WAN right? please correct me if i am wrong. What i have tried: This is how i have tried to setup all. The TG782 router ip is 192.168.1.1 And WRT54G ip is 192.168.1.30 so in WRT54G control panel i have setup like this: ----WAN Connection Type---- Connection Type: Automatic Configuration - DHCP STP: Disabled ----Router IP---- Local IP Address: 192.168.1.30 Subnet Mask: 255.255.255.0 Gateway: 192.168.1.1 (the TG782) ----Network Address Server Settings (DHCP)---- DHCP Type: DHCP Server Start IP Address: 192.168.1.100 Maximum DHCP Users: 6 And this wont work i probably miss something more, if anyone can help i would be thankfull. Also i have to note that i have tried to set my network adapter on pc to use the gateway of WRT54G and ip 192.168.1.102 In short: i cant get it to work normal only as a switch! Thanks for any help! -------EDIT:------- Here is an image which maybe can help: http://img27.imageshack.us/img27/4227/allin1w.jpg

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• How should I manage VPS email?

  - by Xeoncross

  I have been slowly learning how to run a linux VPS for a while now. Since I build websites I'm confident with running and securing a web server like nginx... or at least there haven't been any casualties yet. However, email scares me. Almost all websites require email to communicate with users. Most of the time email is only needed on my sites during registration as a means of verification. I hardly ever need to accept incoming mail back. Nevertheless, my lack off understanding of how email servers can be abused is worrying me. Not only do you need to secure email servers - you also have to prove to the world that your emails are legit and constantly fight against being blacklisted. Insuring my emails 'good name' is not something I want to devote my life too. What should someone like me do to send emails from my VPS? Should I look for a company to send email through that can worry about this for me? Should I just use google apps until my sites are large enough to worry about? Or is all this just ignorant fear and running your own email server (that actually works) really is easy?

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• CouchDB Errors: "undefined symbol: js_fgets" on Ubuntu 10.04

  - by MattEzell

  Hello, ServerFault Community. I have been wrestling with this problem for weeks without resolution and was hoping that someone here might be able to help. As indicated above, this is in Ubuntu 10.04 (x86) using CouchDB 0.11.0. I have build and installed CouchDB 0.11.0 from source. Everything with the dependencies and with the CouchDB install itself 'goes off without a hitch' - no errors or complaints in the configure, make or install... CouchDB seems to be running 'fine'. I can access Futon without issue and utilize all CouchDB functionality found in Futon... Unfortunately, when I attempt to use any shows/views for an installed Couch App, I get the above js_fgets error before terminal (and the Couch log) fills up with TONS of JSON. Nothing ever renders in the browser, though Firebugs reports. I have used the official instructions (paying special attention to the 10.04 instructions) and have followed pretty much every Google thread that I can find on similar issues. I have chase SpiderMonkey (and Rhino) as well as Erlang as the culprit, but despite reinstalls and tests with these components, I still cannot get past this CouchDB issue on my system... Ideas? Pointers? Suggestions? Has anyone successfully installed and used CouchDB 0.11.0 on an Ubuntu 10.04 system to RUN APPLICATIONS? I have come across multiple individuals who immediately respond 'yes, I have it installed - it works great' only to have them realize in the end (as I did) that just because Futon thinks things are working, doesn't mean CouchDB is properly handling ALL requests. Thank you for your time and assistance!

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• HAProxy "503 Service Unavailable" for webserver running on a KVM virtual machine

  - by Menda

  I'm setting up a server with KVM (IP 192.168.0.100) and I have created inside of it one virtual machine using network bridging at 192.168.0.194. This virtual machine has an nginx instance running, which I can access from the server or from any computer computer in the internal network just typing in the browser http://192.168.0.194. However, I try configure HAProxy in the same server that hosts KVM and looking the status page of HAProxy it always shows the virtual machine as "DOWN". If I try from the server http://localhost, it should be the same than if I go to http://192.168.0.194. My goal is to build a reverse proxy, but I tried this little example and won't work. What am I doing bad? This is my config file in the server: # /etc/haproxy/haproxy.cfg global maxconn 4096 user haproxy group haproxy daemon defaults log global mode http option httplog option dontlognull retries 3 option redispatch maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 listen ServerStatus *:8081 mode http stats enable stats auth haproxy:haproxy listen Server *:80 mode http balance roundrobin cookie JSESSIONID prefix option httpclose option forwardfor option httpchk HEAD /check.txt HTTP/1.0 server mv1 192.168.0.194:80 cookie A check Thanks.

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• How to get multipath working for Ubuntu Server 12.04

  - by mlampi

  I'm working on a project which aims to make use of Ubuntu servers running on enterprise class hardware. In our case that means IBM HS23E blade servers, QLogic 4GB fibre channel extension cards and quite old IBM DS4500 disk array with two controllers. At the moment we have fibre channel as only boot option and Ubuntu Server 12.04 installed just fine and is able to boot without multipath. I'm not a linux professional myself but in our team we have people who will understand the technical stuff. Don't let my post confuse :) The current situation is that we have only one fibre channel connection to a single disk array controller. Real life case would be of course quite different. At minimum we should have two fibre channel ports connected to two different switches and two different controllers. However, we have no idea how to set up multipath tool. Is the DM-MPIO the right software? At minimum we should be able to boot when multiple connections are available and achieve fault tolerance when any of them should be down. Since the disk array is not the latest hardware, I managed to find RDAC driver sources only for 2.6.x kernel. And we have 3.2.x. Another issue is to build a multipath.conf. The said driver sources are from IBM support and the QLogic drivers provided to Ubuntu installer are from Ubuntu site. It seems that RHEL and SLES would have near out of the box support but that is not an option for our project. Actual questions: - What is the recommended software tool for multipath for Ubuntu Server 12.04? - Is there available pre-made configurations or templates? Does it require disk array / controller specific settings or do a more generic config work? - Do you have expriences on similar setup and like to share the knowledge? I'll provide you with any additional information you might require. Thanks in advance.

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• Custom MS-DOS / FreeDOS

  - by user1801387

  Goal : Build a custom DOS to boot into. To automate tasks like formating a drive, or doing recovery. I've been using Grub4DOS to boot into these images. So far I've looking into taking a windows repair disk ISO and extracting. I can't seem to find the autoexec.bat in the disk. I really don't know where to look for the startup configuration file to change or how to add an autoexec.bat. I've tried MS-DOS 6.22. But it lacks the diskpart tool I require. I've tried extracting the images and adding it. Then I got a boot failed. I assume that after i added it. All the files when to lower case names and I assume that the OS is case sensitive. Then I've looking into using FreeDOS. But I don't know how it works at all. Partially because I can't seem to grasp the help/wiki's information. I looked into getting a bearbones release with just the kernel and I think it's the config.sys file. But I don't have any idea on how the packaging system works to incorporate diskpart into it. So really I'm in general looking for a small bootable DOS to where I can incorporate diskpart and setup an autoexec.bat for the actual function to carry out and to boot into. Thanks :) This is just for personal use also.

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• Creating basic, redundant gigE or IB storage network for Xen?

  - by StaringSkyward

  With only a modest budget, I want to move my 4 xen servers over to network storage -either NFS or iSCSI which will be determined based on how well it performs when we test it (we need good throughput and it must continue to work through link and switch failure tests). We may add another couple of xen servers at some point when this is done. I don't know much about the design and operation of storage networks, so would really appreciate some hints from those with experience. The budget is around $3,800 excluding the storage appliance. I am currently thinking these are my options to remain on budget: 1) Go for used infiniband hardware and aim for 10gb performance. 2) Stick with gig ethernet and buy some new switches (cisco or procurve) to create a storage-only ethernet LAN. Upgrade to 10gigE later but try to use hardware capable of it where possible to reduce upgrade costs. I have seen used, warrantied infiniband switches at reasonable prices (presumably because big companies are converging on 10gbit ethernet?) and the promise of cheap 10gb is attractive. I know nothing about IB, so here come the questions: Can I buy 2 x switches and have multiple HBAs in my xen and storage nodes to get redundancy and increased performance without complexity or expensive management software costs? If so, can you point me to some examples? Do NFS and iSCSI work just the same regardless? Is IB a sensible choice or could/should I use ethernet or FC on the same budget - I'm keen not to get boxed into a corner for future upgrades, however. For the storage I am likely to build a storage server using nexentastor with the intention that I can later add more disks, SSDs and add another server to provide a failover option at the storage level. An HP LeftHand starter SAN is also under consideration, too. Thanks in advance.

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• How do I make ESXi 5.0 to shutdown virtual machines when the physical power button is pushed?

  - by Pawel Sawicki

  I have a home NAS/DLNA server built out of an HP Micro Server with the HP branded VMware ESXi 5.0.0 build-623860 (free license) installed. Being a home media center I'd like it to be "manageable" by all my household members. This requires that it needs to be powered on an off (including all the VMs inside) by anybody with the physical access to the server by simply pressing the power button on the chassis. The "startup" part is easy to obtain - all I had to do was to configure the startup/shutdown policy: Once the server powers up, all VMs start as well and that's exactly what I need. Well.. it did work up until 5.0.0U1, but that's a different story: http://blogs.vmware.com/vsphere/2012/03/free-esxi-hypervisor-auto-start-breaks-with-50-update-1.html Unfortunately, pressing the power button doesn't gracefully shutdown the guest machines - they are terminated instead. If I run the "shut down" command from the vSphere Client interface guests are powered off. I'd like to get the same end result when the physical power button is switched. I've poked around a bit on the ESXi server. There's a "/sbin/shutdown.sh" script that seemed to do exactly what I need... but after trying it does exactly what the power off button. The "/etc/inittab" contains an entry for the "shutdown" level but I suppose it's not hooked to the power button. I can't find any acpi related configuration, neither do I know what exactly is executed when the power button is pressed. Does anybody have a clue how can I make the VMs shutdown automatically when the physical power switch is pressed to turn of the computer?

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• HP MSR 30-10a Router - Route Traffic over Default Route

  - by SteadH

  We have a brand new HP MSR 30-10a Router. We have a fairly simple routing situation - we have two IP blocks, one which has a route out. We need things on the first block to go through the router, and out. I have an old Cisco 2801 router doing the job right now. For our example - IP Block 1: 50.203.110.232/29, Router interface on this block is 50.203.110.237, route out is 50.203.110.233. IP Block 2: 50.202.219.1/27, Router interface on this block at 50.202.219.20. I have a static route created for: 0.0.0.0 0.0.0.0 50.203.110.233 The router seems to understand this. When on the CLI via serial cable, I can ping 8.8.8.8 and hear responses from Google DNS. Woo hoo! The issue arrives when any client sits on the IP Block 2 side. I configured my client with a static IP of 50.202.219.15/27, default gateway 50.202.219.20. I can ping myself. I can ping the near side of the router (50.202.219.20), and I can ping the far side of the router (50.203.110.237. I cannot ping anything else in IP block 1, nor can I ping 8.8.8.8. Here is my configuration file: <HP>display current-configuration # version 5.20.106, Release 2507, Standard # sysname HP # domain default enable system # dar p2p signature-file flash:/p2p_default.mtd # port-security enable # undo ip http enable # password-recovery enable # vlan 1 # domain system access-limit disable state active idle-cut disable self-service-url disable # user-group system group-attribute allow-guest # local-user admin password cipher $c$3$40gC1cxf/wIJNa1ufFPJsjKAof+QP5aV authorization-attribute level 3 service-type telnet # cwmp undo cwmp enable # interface Aux0 async mode flow link-protocol ppp # interface Cellular0/0 async mode protocol link-protocol ppp # interface Ethernet0/0 port link-mode route ip address 50.203.110.237 255.255.255.248 # interface Ethernet0/1 port link-mode route ip address 50.202.219.20 255.255.255.224 # interface NULL0 # ip route-static 0.0.0.0 0.0.0.0 50.203.110.233 permanent # load xml-configuration # load tr069-configuration # user-interface tty 12 user-interface aux 0 user-interface vty 0 4 authentication-mode scheme # My guess right now is there is some sort of "permission" needed to use the default route. The manuals haven't turned up a lot in this area that don't make the situation much more complicated (but maybe it needs to be more complicated?) Background: we use HP switches, and I love the CLI. I bought HP thinking the command line interface would be similar, or at least speak the same language. Whoops! I'd be happy to provide more information or perform any additional tests. Thanks in advance! Update 1: The manual mentions routing rules. I hadn't previously added these (since our Cisco 2801 seems to route anything by default). I added: ip ip-prefix 1 permit 0.0.0.0 0 less-equal 32 alas, still no dice.

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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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• installing lots of perl modules

  - by Colin Pickard

  Hi, I've been landed with the job of documenting how to install a very complicated application onto a clean server. Part of the application requires a lot of perl scripts, each of which seem to require lots of different perl modules. I don't know much about perl, and I only know one way to install the required modules. This means my documentation now looks this: Type each of these commands and accept all the defaults: sudo perl -MCPAN -e 'install JSON' sudo perl -MCPAN -e 'install Date::Simple' sudo perl -MCPAN -e 'install Log::Log4perl' sudo perl -MCPAN -e 'install Email::Simple' (.... continues for 2 more pages... ) Is there any way I can do all this one line like I can with aptitude i.e. Type the following command and go get a coffee: sudo aptitude install openssh-server libapache2-mod-perl2 build-essential ... Thank you (on behalf of the long suffering people who will be reading my document) EDIT: The best way to do this is to use the packaged versions. For the modules which were not packaged for Ubuntu 10.10 I ended up with a little perl script which I found here ) #!/usr/bin/perl -w use CPANPLUS; use strict; CPANPLUS::Backend->new( conf => { prereqs => 1 } )->install( modules => [ qw( Date::Simple File::Slurp LWP::Simple MIME::Base64 MIME::Parser MIME::QuotedPrint ) ] ); This means I can put a nice one liner in my document: sudo perl installmodules.pl

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• Not playing .mov files in WMP, not loading .mov files in Windows Live Movie Maker. What am I missing?

  - by royatl

  My friend needs to create a video and she has some source files that are .MOV format. I assume they are h.264. She can view the files with QuickTime. She has a laptop running Vista, and a just-downloaded version of Windows Live Movie Maker (which I'll call LMM for short). LMM shows an 'X' icon when she tries to add one of these files to it. My machine runs Windows 7 Pro, and a slightly earlier build of LMM and has no problems editing video with these source files. I assume she's missing a codec but what can I tell her? I've looked at the answer that mentions a QuickTime DirectShow Source Filter Plugin. It mentions only playback through WMP, not editing via LMM, but is that what she needs? I didn't have to load anything like that. That project's now done (she punted and used iMovie on a Mac). But I did gain another clue. She could play a 720p .MOV file, but these were 1920x1080 files.

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• 500 Internal Server Error when setting up Apache on Ubuntu+Django

  - by ApacheQ

  I tried with Apache on ubuntu 9.04 and get the same error: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, webmaster@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. And my apache/error.log is: [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] ServerName: 'sapint2' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] DocumentRoot: '/etc/apache2/htdocs' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] URI: '/' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] Location: '/' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] Directory: None [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] Filename: '/etc/apache2/htdocs' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] PathInfo: '/' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] Traceback (most recent call last): [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/lib/python2.7/dist-packages/mod_python/importer.py", line 1537, in HandlerDispatch\n default=default_handler, arg=req, silent=hlist.silent) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/lib/python2.7/dist-packages/mod_python/importer.py", line 1229, in _process_target\n result = _execute_target(config, req, object, arg) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/lib/python2.7/dist-packages/mod_python/importer.py", line 1128, in _execute_target\n result = object(arg) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/modpython.py", line 180, in handler\n return ModPythonHandler()(req) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/modpython.py", line 142, in call\n self.load_middleware() [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 45, in load_middleware\n mod = import_module(mw_module) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py", line 35, in import_module\n import(name) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/middleware.py", line 4, in \n from django.utils.cache import patch_vary_headers [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/utils/cache.py", line 25, in \n from django.core.cache import get_cache [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/cache/init.py", line 187, in \n cache = get_cache(DEFAULT_CACHE_ALIAS) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/cache/init.py", line 179, in get_cache\n cache = backend_cls(location, params) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/cache/backends/memcached.py", line 139, in init\n "Memcached cache backend requires either the 'memcache' or 'cmemcache' library" [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] InvalidCacheBackendError: Memcached cache backend requires either the 'memcache' or 'cmemcache' library [Sat Oct 06 09:51:30 2012] [notice] caught SIGTERM, shutting down [Sat Oct 06 09:51:31 2012] [notice] mod_python: Creating 8 session mutexes based on 150 max processes and 0 max threads. [Sat Oct 06 09:51:31 2012] [notice] mod_python: using mutex_directory /tmp [Sat Oct 06 09:51:31 2012] [notice] Apache/2.2.17 (Ubuntu) PHP/5.3.5-1ubuntu7.11 with Suhosin-Patch mod_python/3.3.1 Python/2.7.1+ mod_wsgi/3.3 configured -- resuming normal operations I need some help Thanks

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• JSP Content Issue in Tomcat

  - by gautam vegeta

  There is one application where I work where there are still manual builds used i.e manually moving the servlet classes and jsp files from Dev to QA and finally to Prod. This is the method used in this application which cant be changed for some wierd reasons.BTW this is not the problem. We did a manual build where we transferred jsp files from QA to PROD recently. And we noticed that the jsp file content does not correspond to the updated jsp's but have the same content to the jsp file which was present in the server prior to the deployment. We did not re-start tomcat since jsp files upon updation automatically changes its contents. This problem persisted even after 6 hours of deployment If we consider the time standards which are different which may cause some delay. So to fix this we had to individually go into every jsp file and just type something save it and delete this change and save it.Then it worked perfectly. But finally the jsp file content before and after was never changed we just did this to change the modification date. If we think in terms of timestamp problem how can this be possible coz the old jsp files which were present in the server prior to deployment was atlest one month old and the ones getting deployed were defenitely newer than that. Why did this happen? This did not happen when we did same type of deployments earlier. How can we prevent this from happening in the future.

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• What do I need to consider when buying hardware to meet my needs?

  - by Darth Android

  I'm looking to build a new computer from the ground up. I'm not sure what to look out for and need guidance and help on how to pick the hardware needed to construct my new rig. How do I know what to buy? How do I find out if a given CPU will be enough for a certain game or application that I want to run? How do I find out if a given graphics card will be enough for a certain game or application? What is important when looking at motherboards? How much memory do I need? How do I know how much wattage I need for a power supply? What size case do I need? What relevant standards do I need to read up on and be aware of? PCI, PCIe, SATA, USB 2.0, USB 3.0, etc... What "gotchas" do I need to be on the lookout for? Please keep responses generation-agnostic to ensure they will be helpful to our future users. While Stack Exchange does not permit shopping recommendations, it doesn't provide any general advice to consider when buying hardware. So, instead of just telling those that ask what to buy that it's not allowed, let's tell them how to figure out what they need. This question was Super User Question of the Week #20 Read the June 20, 2011 blog entry for more details or submit your own Question of the Week.

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• Is it possible/practical to install and run Linux on a USB flash drive?

  - by Graeme Donaldson

  I'm going to replace my old 2004 vintage desktop PC soon and I have an idea of what I want to do, I'm just not sure if it's possible or realistic. In the time since I built the old PC it has slowly become less used as a PC and more as a file server, so I figured I'd build a small file server which could also function as a router/DHCP/DNS/whatever box. The idea is to base it on an Atom system. I have my eye on the Intel D510MO for the moment. This supports 2 SATA disks, and I'd prefer to dedicate those to data storage. I'd like to install Ubuntu Server or maybe Debian on a 8/16GB USB flash drive. I have seen plenty of tutorials on how to perform an installation from a USB drive, but I can't seem to find any info on actually booting and running the OS from USB flash. Is this even possible? Is it practical? This box will mostly be used for: Making backups of mine and my wife's notebooks via LAN. Will use SMB or NFS for this. Digital media storage, which will be accessed by a Mede8er box with no storage of its own. I will most likely use NFS for this.

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• Splunk is fantastically expensive: What are the alternatives? [closed]

  - by samsmith

  Possible Duplicate: Alternatives to Splunk? This has been discussed, but it has been several months, so it may be time to revisit it: Earlier discussion RE Splunk alternatives For the record, Splunk rocks. But the pricing is simply beyond what we can consider (When I spoke with Splunk today, the cost for a system to index 5gb/day of data is over $30,000.) That is more than we spend on SQL Server (by a large multiple), more than we spend on a rack of servers (by a multiple), etc. etc. The splunk sales team is correct (that for $30K we get more value and functionality than if we spend the same building our own system), but it doesn't matter. The splunk cost is simply too high (by a multiple). Soooooo, we are looking around! Is anyone out there building a splunk like system? Our basic need: Able to listen for syslog messages on multiple udp ports Able to index the incoming data in an async way Some kind of search engine Some kind of UI An API to the search engine (to embed in our console) We currently need to index 3-5gb/day, but need to be able to scale to 10gb/day or more. We do not need a lot of history (30 days is fine). We use Windows 2008 and 2003 servers. Thanks for your thoughts! UPDATE: We spent two weeks researching commercial and open source options. Our conclusion: Write our own (we are a software company... we know how to write things). We built a great system built on mongodb and .NET that gives us the functions we needed from MongoDB in about one engineering week. We have now completed our implementation. We use two Mongodb servers (master and slave), and are able to log and index any amount of log data (5gb/day, 15gb/day, etc), limited only by disk space. OBSERVATIONS: This space needs a solid solution that is $1000-3000 flat rate. The licensing models used by the commercial firms are based on a "milk the data center ops guys" models. That is their right (of course!), but it leaves a HUGE space open for someone to come in underneath them. My guess is that in another year or two there will be a good open source solution that will be really usable. Thank you all for your input (even if it was self promotion).

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• System Requirements of a write-heavy applications serving hundreds of requests per second

  - by Rolando Cruz

  NOTE: I am a self-taught PHP developer who has little to none experience managing web and database servers. I am about to write a web-based attendance system for a very large userbase. I expect around 1000 to 1500 users logged-in at the same time making at least 1 request every 10 seconds or so for a span of 30 minutes a day, 3 times a week. So it's more or less 100 requests per second, or at the very worst 1000 requests in a second (average of 16 concurrent requests? But it could be higher given the short timeframe that users will make these requests. crosses fingers to avoid 100 concurrent requests). I expect two types of transactions, a local (not referring to a local network) and a foreign transaction. local transactions basically download userdata in their locality and cache it for 1 - 2 weeks. Attendance equests will probably be two numeric strings only: userid and eventid. foreign transactions are for attendance of those do not belong in the current locality. This will pass in the following data instead: (numeric) locality_id, (string) full_name. Both requests are done in Ajax so no HTML data included, only JSON. Both type of requests expect at the very least a single numeric response from the server. I think there will be a 50-50 split on the frequency of local and foreign transactions, but there's only a few bytes of difference anyways in the sizes of these transactions. As of this moment the userid may only reach 6 digits and eventid are 4 to 5-digit integers too. I expect my users table to have at least 400k rows, and the event table to have as many as 10k rows, a locality table with at least 1500 rows, and my main attendance table to increase by 400k rows (based on the number of users in the users table) a day for 3 days a week (1.2M rows a week). For me, this sounds big. But is this really that big? Or can this be handled by a single server (not sure about the server specs yet since I'll probably avail of a VPS from ServInt or others)? I tried to read on multiple server setups Heatbeat, DRBD, master-slave setups. But I wonder if they're really necessary. the users table will add around 500 1k rows a week. If this can't be handled by a single server, then if I am to choose a MySQL replication topology, what would be the best setup for this case? Sorry, if I sound vague or the question is too wide. I just don't know what to ask or what do you want to know at this point.

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