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• What version-control system is most trivial to set up and use for toy projects?

  - by Norman Ramsey

  I teach the third required intro course in a CS department. One of my homework assignments asks students to speed up code they have written for a previous assignment. Factor-of-ten speedups are routine; factors of 100 or 1000 are not unheard of. (For a factor of 1000 speedup you have to have made rookie mistakes with malloc().) Programs are improved by a sequence is small changes. I ask students to record and describe each change and the resulting improvement. While you're improving a program it is also possible to break it. Wouldn't it be nice to back out? You can see where I'm going with this: my students would benefit enormously from version control. But there are some caveats: Our computing environment is locked down. Anything that depends on a central repository is suspect. Our students are incredibly overloaded. Not just classes but jobs, sports, music, you name it. For them to use a new tool it has to be incredibly easy and have obvious benefits. Our students do most work in pairs. Getting bits back and forth between accounts is problematic. Could this problem also be solved by distributed version control? Complexity is the enemy. I know setting up a CVS repository is too baffling---I myself still have trouble because I only do it once a year. I'm told SVN is even harder. Here are my comments on existing systems: I think central version control (CVS or SVN) is ruled out because our students don't have the administrative privileges needed to make a repository that they can share with one other student. (We are stuck with Unix file permissions.) Also, setup on CVS or SVN is too hard. darcs is way easy to set up, but it's not obvious how you share things. darcs send (to send patches by email) seems promising but it's not clear how to set it up. The introductory documentation for git is not for beginners. Like CVS setup, it's something I myself have trouble with. I'm soliciting suggestions for what source-control to use with beginning students. I suspect we can find resources to put a thin veneer over an existing system and to simplify existing documentation. We probably don't have resources to write new documentation. So, what's really easy to setup, commit, revert, and share changes with a partner but does not have to be easy to merge or to work at scale? A key constraint is that programming pairs have to be able to share work with each other and only each other, and pairs change every week. Our infrastructure is Linux, Solaris, and Windows with a netapp filer. I doubt my IT staff wants to create a Unix group for each pair of students. Is there an easier solution I've overlooked? (Thanks for the accepted answer, which beats the others on account of its excellent reference to Git Magic as well as the helpful comments.)

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• How can I program ksh93 to use bash autocompletion?

  - by Norman Ramsey

  In a comment in response to a shell question, user tinkertim said that it was easy to hack ksh to use the bash autocompletion library. I would like nothing better than to use bash autocompletion with AT&T ksh93. How can this be done? ksh93 has a new release several times a year, so I am looking for a solution that does not involve modifying the source code. ksh93 can link new C modules dynamically and also is highly programmable (I run a ksh function at every keystroke), so modifying the source should not really be necessary. Note: I am not talking about filename autocompletion, which is easy to do in ksh. I'm talking about all the other yummy autocompletion stuff that bash does, like autocompletion options for nmh commands or autocompleting Mercurial commmands. Stuff like that.

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• OpenSSL Ignore Self-signed certificate error

  - by Ramsey

  I'm writing a small program with the OpenSSL library that is suppose to establish a connection with an SSLv3 server. This server dispenses a self-signed certificate, which causes the handshake to fail with this message: "sslv3 alert handshake failure, self signed certificate in certificate chain." Is there a way I can force the connection to proceed? I've tried calling SSL_CTX_set_verify like so: SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL); But it does not seem to change anything. Any suggestions?

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• Apache Redirect to Jboss SSL

  - by Rick

  I'm trying to have an SSL Connection to an Apache server on port 443 which I want to use to proxy connections to a JBoss server on a different port. The SSL certificates sit on the Jboss server not on the Apache server. Is it possible to redirect HTTPS traffic from Apache to the Jboss Server and have the JBoss server do the SSL handshake? The Apache server must be able to redirect HTTPS traffic for two different URLS. One for a secure site. The other for access to web services. By the way I'm using it mutual authentication, if that makes any difference. What does the Apache config file need to contain? or are there any good example of this out there? Thanks

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• Accessing apache on virtual pc

  - by Rick Hensly

  I am using a virtual pc to test my website. I can access all my webpages on the virtual pc. However, images don't load correctly. I can browse to my images folder and view all of them. However, if I click an image it will not load, and the apache log shows the virtual pc's ip trying to view the image: 192.168.0.55 - - [25/Jun/2009:20:10:41 -0400] "GET /images/pic.png HTTP/1.1" 302 220 Now, if I refresh the page it loads. 192.168.0.55 - - [25/Jun/2009:20:10:51 -0400] "GET /images/bg.png HTTP/1.1" 200 214 Also, images won't load in html or css. It seems like a redirecting problem or something, but I have no clue how to fix it. Thanks for any advice

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• Is there a way to tell SGE to run specific jobs as root on the execution node?

  - by Rick Reynolds

  The title kinda says it all... We're using SGE/OGE to submit jobs to a set of worker nodes that then do things with specific pieces of equipment. The programs and scripts that have been created that manipulate this equipment rely on running as root. I'd like SGE to handle allocation of resources in a way that is mindful of users, groups, projects, etc., but I also need the actual jobs to run with root permissions. I've read up on How can one run a prologue script as root in gridengine? to see if anything there was pertinent, but it seems that SGE is providing the "user@" kind of spec specifically for prolog and epilog kinds of actions. Is there any similar functionality for the job itself? I'm aware of su/sudo approaches, but that won't really work in this environment because the sudoers file isn't globally managed (i.e. I'd have to add a whole set of users to /etc/sudoers on lots of machines). I'm currently looking into a setuid kind of solution, but that would definitely be an unnecessary kind of work-around if SGE provides me a way to declare that a specific job (or jobs in a specific queue) always needs to run with a specific user's rights.

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• How do I fix "ORA-01033: ORACLE initialization or shutdown in progress" error?

  - by Rick

  I have an Oracle 9.2 database. The server has crashed. After rebooting any attempt to connect to the Oracle server returns error ORA-01033 (as in title). I've tried stopping and starting the Oracle services (from Control Panel - Administrative Tools - Services). Also, I have waited half an hour, so I don't think the Oracle server is legitimately still starting up. My feeling is that more likely something is corrupted.

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• qemu-kvm virtual machine virtio network freeze under load

  - by Rick Koshi

  I'm having a problem with my virtual machines, where the network will freeze under heavy load. I'm using CentOS 6.2 as both host and guest, not using libvirt, just running qemu-kvm directly as follows: /usr/libexec/qemu-kvm \ -drive file=/data2/vm/rb-dev2-www1-vm.img,index=0,media=disk,cache=none,if=virtio \ -boot order=c \ -m 2G \ -smp cores=1,threads=2 \ -vga std \ -name rb-dev2-www1-vm \ -vnc :84,password \ -net nic,vlan=0,macaddr=52:54:20:00:00:54,model=virtio \ -net tap,vlan=0,ifname=tap84,script=/etc/qemu-ifup \ -monitor unix:/var/run/vm/rb-dev2-www1-vm.mon,server,nowait \ -rtc base=utc \ -device piix3-usb-uhci \ -device usb-tablet /etc/qemu-ifup (used by the above command) is a very simple script, containing the following: #!/bin/sh sudo /sbin/ifconfig $1 0.0.0.0 promisc up sudo /usr/sbin/brctl addif br0 $1 sleep 2 And here's the info on br0 and other interfaces: avl-host3 14# brctl show bridge name bridge id STP enabled interfaces br0 8000.180373f5521a no bond0 tap84 virbr0 8000.525400858961 yes virbr0-nic avl-host3 15# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: em1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP qlen 1000 link/ether 18:03:73:f5:52:1a brd ff:ff:ff:ff:ff:ff 3: em2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP qlen 1000 link/ether 18:03:73:f5:52:1a brd ff:ff:ff:ff:ff:ff 4: em3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether 18:03:73:f5:52:1e brd ff:ff:ff:ff:ff:ff 5: em4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether 18:03:73:f5:52:20 brd ff:ff:ff:ff:ff:ff 6: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 18:03:73:f5:52:1a brd ff:ff:ff:ff:ff:ff inet6 fe80::1a03:73ff:fef5:521a/64 scope link valid_lft forever preferred_lft forever 7: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 18:03:73:f5:52:1a brd ff:ff:ff:ff:ff:ff inet 172.16.1.46/24 brd 172.16.1.255 scope global br0 inet6 fe80::1a03:73ff:fef5:521a/64 scope link valid_lft forever preferred_lft forever 8: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 52:54:00:85:89:61 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 9: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 500 link/ether 52:54:00:85:89:61 brd ff:ff:ff:ff:ff:ff 12: tap84: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500 link/ether ba:e8:9b:2a:ff:48 brd ff:ff:ff:ff:ff:ff inet6 fe80::b8e8:9bff:fe2a:ff48/64 scope link valid_lft forever preferred_lft forever bond0 is a bond of em1 and em2. virbr0 and virbr0-nic are vestigial interfaces left over from CentOS's default installation. They are unused (as far as I know). The guest runs perfectly until I run a large 'rsync', when the network will freeze after some seemingly-random time (usually under a minute). When it freezes, there is no network activity in or out of the guest. I can still connect to the guest's console via vnc, but it is unable to speak out its network interface. Any attempt to 'ping' from the guest gives a "Destination Host Unreachable" error for 3/4 packets and no reply for every fourth packet. Sometimes (perhaps two thirds of the time), I can bring the interface back to life by doing a "service network restart" from the guest's console. If this works (and if I do it before the rsync times out), the rsync will resume. Usually it will freeze again within a minute or two. If I repeat, the rsync will eventually finish, and I presume the machine goes back to waiting for another period of heavy load. Throughout the whole process, there are no console errors or relevant (that I can see) syslog messages on either guest or host machine. If the "service network restart" doesn't work the first time, trying again (and again and again) never seems to work. The command completes normally, with normal output, but the interface stays frozen. However, a soft reboot of the guest machine (without restarting qemu-kvm) always seems to bring it back. I am aware of the "lowest mac address" assignment problem, where the bridge takes on the mac address of the slave interface with the lowest mac address. This causes temporary network freezes, but is definitely not what's happening for me. My freezes are permanent until manual intervention, and you can see from the 'ip addr show' output above that the mac address being used by br0 is that of the physical ethernet. There are no other virtual machines running on the host. I've verified that each virtual machine on the subnet has its own unique mac address. I have rebuilt the guest machine several times, and I have tried this on three different host machines (identical hardware, built identically). Oddly, I do have one virtual host (the second of this series) which never seemed to have a problem. It never had its network freeze when it was running the same rsync during its build. It's particularly odd because it was the second build. The first, on a different host, did have the freezing problem, but the second did not. I assumed at the time that I had done something wrong with the first build, and that the problem was resolved. Unfortunately, the problem reappeared when I built the third VM. Also unfortunately, I can't do many tests with the working VM, as it's now in production use, and I'm hoping I can find the cause of this issue before that machine starts having problems. It's possible that I just got really lucky while running the rsync on the working machine, and that one time it didn't freeze. Of course it's possible that I somehow changed the build scripts without realizing it and re-broke something, but I can't find any such thing. In any case, I'm hoping someone has some idea what could cause this. Addendum: Preliminary tests suggest that I don't have the problem if I substitute e1000 for virtio in the first -net flag to qemu-kvm. I don't consider this a solution, but it is suitable for a stopgap. Has anyone else had (or better yet, solved) this problem with the virtio network driver?

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• Glassfish with Webservices on non default port

  - by Rick

  I have a simple web service that I created that deploys perfectly on a default Glassfish V2.1 install on both a windows and a linux system. HOWEVER, In the production environment, Glassfish has the default port for the domain changed from port 8080 to port 80. Now when I try to deploy the web service it will not deploy to the server. The production server is brand new and only was a few webpages on it. Other than the port everything else seems to be the same. I cannot change the port on the production server. In fact I tried to change the port on the linux test server tfrom 8080 to port 80 and I get the same result as the production server. Any ideas - other than don't use glassfish? :)

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• Can't connect to samba

  - by Rick

  Windows 7, connecting to Samba shares I have a follow up question from the link above. I am running Samba 3.0.23d on FreeBSD is release 7.1 I changed the policies as described above but still cannot connect to the samba server with the windows 7 or a server 2008. I feel it is a problem with recognizing the new machines on the network. the windows machines can see the samba server, but cannot connect to it or view any of the files. After changing the security policies the samba server asked for network id and password but would not allow the machine to connect, said they were unknown username or bad password. Here is my current config file. there is no sign of encryption anywhere, should I just add the line? not sure what that would do elsewhere. Workgroup = WWOFFSET server string = WWO File Server (%v) security = server username map = /usr/local/etc/smb.users hosts allow = 10. 127. # If you want to automatically load your printer list rather # than setting them up individually then you'll need this ; load printers = yes # you may wish to override the location of the printcap file ; printcap name = /etc/printcap # on SystemV system setting printcap name to lpstat should allow # you to automatically obtain a printer list from the SystemV spool # system ; printcap name = lpstat # It should not be necessary to specify the print system type unless # it is non-standard. Currently supported print systems include: # bsd, cups, sysv, plp, lprng, aix, hpux, qnx ; printing = cups # Uncomment this if you want a guest account, you must add this to /etc/passwd # otherwise the user "nobody" is used ; guest account = pcguest # this tells Samba to use a separate log file for each machine # that connects log file = /var/log/samba/log.%m # Put a capping on the size of the log files (in Kb). max log size = 50 # Use password server option only with security = server # The argument list may include: # password server = My_PDC_Name [My_BDC_Name] [My_Next_BDC_Name] # or to auto-locate the domain controller/s # password server = * ; password server = <NT-Server-Name> password server = SERVER0 # Use the realm option only with security = ads # Specifies the Active Directory realm the host is part of ; realm = MY_REALM # Backend to store user information in. New installations should # use either tdbsam or ldapsam. smbpasswd is available for backwards # compatibility. tdbsam requires no further configuration. ; passdb backend = tdbsam ; passdb backend = smbpasswd # Using the following line enables you to customise your configuration # on a per machine basis. The %m gets replaced with the netbios name # of the machine that is connecting. # Note: Consider carefully the location in the configuration file of # this line. The included file is read at that point. ; include = /usr/local/etc/smb.conf.%m # Most people will find that this option gives better performance. # See the chapter 'Samba performance issues' in the Samba HOWTO Collection # and the manual pages for details. # You may want to add the following on a Linux system: # SO_RCVBUF=8192 SO_SNDBUF=8192 socket options = TCP_NODELAY # Configure Samba to use multiple interfaces # If you have multiple network interfaces then you must list them # here. See the man page for details. ; interfaces = 192.168.12.2/24 192.168.13.2/24 # Browser Control Options: # set local master to no if you don't want Samba to become a master # browser on your network. Otherwise the normal election rules apply ; local master = no # OS Level determines the precedence of this server in master browser # elections. The default value should be reasonable ; os level = 33 # Domain Master specifies Samba to be the Domain Master Browser. This # allows Samba to collate browse lists between subnets. Don't use this # if you already have a Windows NT domain controller doing this job ; domain master = yes # Preferred Master causes Samba to force a local browser election on startup # and gives it a slightly higher chance of winning the election ; preferred master = yes # Enable this if you want Samba to be a domain logon server for # Windows95 workstations. ; domain logons = yes # if you enable domain logons then you may want a per-machine or # per user logon script # run a specific logon batch file per workstation (machine) ; logon script = %m.bat # run a specific logon batch file per username ; logon script = %U.bat # Where to store roving profiles (only for Win95 and WinNT) # %L substitutes for this servers netbios name, %U is username # You must uncomment the [Profiles] share below ; logon path = \\%L\Profiles\%U # Windows Internet Name Serving Support Section: # WINS Support - Tells the NMBD component of Samba to enable it's WINS Server ; wins support = yes # WINS Server - Tells the NMBD components of Samba to be a WINS Client # Note: Samba can be either a WINS Server, or a WINS Client, but NOT both ; wins server = w.x.y.z # WINS Proxy - Tells Samba to answer name resolution queries on # behalf of a non WINS capable client, for this to work there must be # at least one WINS Server on the network. The default is NO. ; wins proxy = yes # DNS Proxy - tells Samba whether or not to try to resolve NetBIOS names # via DNS nslookups. The default is NO. dns proxy = no # charset settings ; display charset = ASCII ; unix charset = ASCII ; dos charset = ASCII # These scripts are used on a domain controller or stand-alone # machine to add or delete corresponding unix accounts ; add user script = /usr/sbin/useradd %u ; add group script = /usr/sbin/groupadd %g ; add machine script = /usr/sbin/adduser -n -g machines -c Machine -d /dev/null -s /bin/false %u ; delete user script = /usr/sbin/userdel %u ; delete user from group script = /usr/sbin/deluser %u %g ; delete group script = /usr/sbin/groupdel %g unix extensions = no

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• Windows Media Player library not appearing properly

  - by Rick

  Windows Media Player library is listed 80% under unknown artist/unknown album despite each song containing the album and artist details. The library location is usually unresponsive and Media Player 12 is usually hanging for 3 or 4 minutes every 5 or 6 minutes. Library was fine two weeks ago then I had updated and it has not worked right since. My PC specifics: Windows 7 Ultimate 32bit 8 GB ram Processor 3.76 Ghz Primary drive 1Tb Secondary drive 500Gb Default save for the library is on the secondary drive. I've already tried media player settings troubleshooter and the library troubleshooter to no avail.

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• new monitor won't work on win3.1

  - by Rick Workover

  My old system monitor for my Windows 3.1 machine failed and the new flat screen has a sync error. The new monitors do not support the refresh/screen size it is set to. It boots up into Windows and the monitor is blank with a sync error. Without Windows 3.1 working I don't know how to change the refresh/size to get it to work. I haven't used Win3.1 in so long that I can't remember how to fix this. So, how do I reset the refresh rate and screen resolution it is set to, without being able to actually see anything?

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• Find the product key I entered for MS Office on Mac

  - by Rick Reynolds

  I have several legal license keys for Office:mac 2008. I want to do a quick audit of the two machines I've installed office on and verify which license keys are being used where. But I don't see the license key anywhere on the about dialog (or elsewhere). I've seen other postings on the 'net directing me to look at various .plist files, but those only give me the "Product ID" which is different from the license key (which MS calls the "Product Key" on the little sticker). Is there a way outside of calling MS to correlate the Product Key (which is required for installation and is the real license key) to the Product ID I see in the app itself?

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• What can cause SQL 2008 Transaction Log Shipping to stop functioning?

  - by Rick

  I read somewhere that doing a backup or when Maintenance Plan runs can cause Log Shipping to stop functioning. Is this true? What should we watch out for once our Transaction Log Shipping is in place that could stop it? A Log Shipping test we were doing between two databases on the same SQL 2008 server appeared to stop working without any error. When we checked the History of the LSRestore_* job it was always ignoring the new *.trn files. Any suggestions? Thanks.

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• Slow File Copy observed copying 40GB files across network to iSCSI device

  - by Rick

  Here's a curious ones for the gurus: Setup: Source Machine: Windows Server 2003 R2 machine with local hard drive. VHD file of 40GB. 1 x 1Gbps network card, Cat6 cable, switch. Target Machine: Windows Server 2008 R2 machine with iSCSI connection to iSCSI target on separate machine (1TB, RAID5). 1 x 1Gbps network card, Cat6 cable, connected to same switch as for Source Machine. Second 1Gbps network card, Cat6 cable, connected via isolated switch to the iSCSI target. Switches are Netgear JGS524 model (web managed). If I copy from the Win2003R2 machine to Win2008R2 machine local drive I get 40GB in 45 minutes, 36 seconds. If I copy from the Win2008R2 machine to the iSCSI target (local drive to iSCSI target) I get 40GB in 37 minutes 56 seconds. If I copy from the Win2003R2 machine to the iSCSI target via the Win2008R2 machine I get 40GB in 3 hours, 50 minutes, 24 seconds. All copies were done via the following command issued on the Win2008R2 box: XCOPY <source> <target> /J XCOPY /J - Copies using unbuffered I/O. Recommended for very large files. So, what's the bit I'm missing here? Why does a back-to-back copy take in total 1 hour, 23 minutes, 32 seconds when a "straight through" copy take almost 3 times as long? Switches show no errors, network hovers around the 3% utilisation mark for the duration of the copy (whereas the "back-to-back" copies are around the 25% utilisation mark). What have I missed?

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• Generic Post Script driver for Windows Vista x64?

  - by Rick

  I have an old HP parallel port printer that is not supported by Vista. No drivers I've found online work with it. As a last ditch effort, I was hoping to find some generic postscript drivers for Vista x64 in the hopes that the printer will accept those commands. Does anyone know where I could come by such drivers?

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• How do I prevent Outlook users voting multiple times

  - by Rick

  Using the voting buttons in Outlook 2007, apparently users can submit votes as many times as they like. (I have just now verified this behaviour.) Is there a way to restrict the uses to just one vote each? I've found a script online which claims to do this, but there's no way I can use a script like that across our company. I'm hoping it's just a configuration setting either in the outbound email, or in the user's Outlook client.

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• Problem with Graphics Card, Power Supply or Mother Board?

  - by Rick Siegert

  I have a problem that is driving me to the edge. My graphics card periodically looses power for a moment, then comes back. Once in a while it takes much longer, like 5 minutes. I have always tried rebooting during that period, since I don't know then. Black screen, with a no power message across my monitor. All equipment is only a few months old. The Motherboard is a few months old, MSI N9A2 Platinum Revision 1 (AMD). The Video Card is a Gigabyte Radeon HD 4850 1GB. The power supply is an Ultra 700w My OS is Xp Pro, sp3 Any ideas or suggestions how to solve this

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• Resrtict MS Access creation

  - by Rick

  Is it possible to restrict MS Access creation but still be able to view and execute Access files.

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• VFS: file-max limit 1231582 reached

  - by Rick Koshi

  I'm running a Linux 2.6.36 kernel, and I'm seeing some random errors. Things like ls: error while loading shared libraries: libpthread.so.0: cannot open shared object file: Error 23 Yes, my system can't consistently run an 'ls' command. :( I note several errors in my dmesg output: # dmesg | tail [2808967.543203] EXT4-fs (sda3): re-mounted. Opts: (null) [2837776.220605] xv[14450] general protection ip:7f20c20c6ac6 sp:7fff3641b368 error:0 in libpng14.so.14.4.0[7f20c20a9000+29000] [4931344.685302] EXT4-fs (md16): re-mounted. Opts: (null) [4982666.631444] VFS: file-max limit 1231582 reached [4982666.764240] VFS: file-max limit 1231582 reached [4982767.360574] VFS: file-max limit 1231582 reached [4982901.904628] VFS: file-max limit 1231582 reached [4982964.930556] VFS: file-max limit 1231582 reached [4982966.352170] VFS: file-max limit 1231582 reached [4982966.649195] top[31095]: segfault at 14 ip 00007fd6ace42700 sp 00007fff20746530 error 6 in libproc-3.2.8.so[7fd6ace3b000+e000] Obviously, the file-max errors look suspicious, being clustered together and recent. # cat /proc/sys/fs/file-max 1231582 # cat /proc/sys/fs/file-nr 1231712 0 1231582 That also looks a bit odd to me, but the thing is, there's no way I have 1.2 million files open on this system. I'm the only one using it, and it's not visible to anyone outside the local network. # lsof | wc 16046 148253 1882901 # ps -ef | wc 574 6104 44260 I saw some documentation saying: file-max & file-nr: The kernel allocates file handles dynamically, but as yet it doesn't free them again. The value in file-max denotes the maximum number of file- handles that the Linux kernel will allocate. When you get lots of error messages about running out of file handles, you might want to increase this limit. Historically, the three values in file-nr denoted the number of allocated file handles, the number of allocated but unused file handles, and the maximum number of file handles. Linux 2.6 always reports 0 as the number of free file handles -- this is not an error, it just means that the number of allocated file handles exactly matches the number of used file handles. Attempts to allocate more file descriptors than file-max are reported with printk, look for "VFS: file-max limit reached". My first reading of this is that the kernel basically has a built-in file descriptor leak, but I find that very hard to believe. It would imply that any system in active use needs to be rebooted every so often to free up the file descriptors. As I said, I can't believe this would be true, since it's normal to me to have Linux systems stay up for months (even years) at a time. On the other hand, I also can't believe that my nearly-idle system is holding over a million files open. Does anyone have any ideas, either for fixes or further diagnosis? I could, of course, just reboot the system, but I don't want this to be a recurring problem every few weeks. As a stopgap measure, I've quit Firefox, which was accounting for almost 2000 lines of lsof output (!) even though I only had one window open, and now I can run 'ls' again, but I doubt that will fix the problem for long. (edit: Oops, spoke too soon. By the time I finished typing out this question, the symptom was/is back) Thanks in advance for any help. And another update: My system was basically unusable, so I decided I had no option but to reboot. But before I did, I carefully quit one process at a time, checking /proc/sys/fs/file-nr after each termination. I found that, predictably, the number of open files gradually went down as I closed things down. Unfortunately, it wasn't a large effect. Yes, I was able to clear up 5000-10000 open files, but there were still over 1.2 million left. I shut down just about everything. All interactive shells, except for the one ssh I left open to finish closing down, httpd, even nfs service. Basically everything in the process table that wasn't a kernel process, and there were still an appalling number of files apparently left open. After the reboot, I found that /proc/sys/fs/file-nr showed about 2000 files open, which is much more reasonable. Starting up 2 Xvnc sessions as usual, along with the dozen or so monitoring windows I like to keep open, brought the total up to about 4000 files. I can see nothing wrong with that, of course, but I've obviously failed to identify the root cause. I'm still looking for ideas, since I definitely expect it to happen again. And another update, the next day: I watched the system carefully, and discovered that /proc/sys/fs/file-nr showed a growth of about 900 open files per hour. I shut down the system's only NFS client for the night, and the growth stopped. Mind you, it didn't free up the resources, but it did at least stop consuming more. Is this a known bug with NFS? I'll be bringing the NFS client back online today, and I'll narrow it down further. If anyone is familiar with this behavior, feel free to jump in with "Yeah, NFS4 has this problem, go back to NFS3" or something like that.

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• IIS7 301 permanent redirect from billarga.com.au to billarga.com

  - by Rick

  Using IIS7 GUI, I have placed a 301 permanent redirection from billarga.com.au to billarga.com and left the other behaviours unchecked (want relative redirect). As soon as I apply the redirect on the .com.au, the same redirect appears for the .com domain. Why? I don't understand why changing one will do the same to the other. Has it got something to do with both using the same bindings? Each domain uses two bindings, one with www and the other without. My aim is to condense all traffic and google listings to the one domain, but still be able to use the .com.au for appearance purposes in the url (for aussies). Any help with this is appreciated!

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• Linux Software RAID: How to fsck on hard drive?

  - by Rick-Rainer Ludwig

  We have a Linux server running with Software RAID1. We see some issues in /var/log/messages like: unreadable sector. I want to perform a complete fsck on the drive to get some more information, but a fsck /dev/md0 brings a clean due to the Software RAID layer in between. How can I check the real hard drive? Do I need to disassemble the whole RAID? How do I deal with the inconsistency in the partition due to the additional Software RAID header? Does anyone have a good idea for this?

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• Handling site not found and page not found with dynamic mass virtual hosting

  - by Rick Moynihan

  I have recently setup mass virtual hosting in Apache so that all we need to do is create a directory to create a new vhost. We're then also using wildcard DNS to map all subdomains to the server running our Apache instance. This works excellently, however I'm now having trouble configuring it to fail-over to an appropriate default/error-page when the vhost directory does not exist. The problem appears to be conflated between by my desire to handle the two error conditions: vhost not found i.e. there was no directory found matching the host supplied in the HTTP host header. I'd like this to display an appropriate site not found error page. The 404 page not found condition of the vhost. Additionally I have a specialised "api" vhost in its own vhost block. I've tried a number of variations and none seem to exhibit the behaviour I want. Here's what I'm working with right now: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot /var/www/site-not-found ServerName sitenotfound.mydomain.org ErrorDocument 500 /500.html ErrorDocument 404 /500.html </VirtualHost> <VirtualHost *:80> ServerName api.mydomain.org DocumentRoot /var/www/vhosts/api.mydomain.org/current # other directives, e.g. setting up passenger/rails etc... </VirtualHost> <VirtualHost *:80> # get the server name from the Host: header UseCanonicalName Off VirtualDocumentRoot /var/www/vhosts/%0/current # other directives ... e.g proxy passing to api etc... ErrorDocument 404 /404.html </VirtualHost> My understanding is that the first vhost block is used as the default, so I have this here as my catch all site. Next I have my API vhost, and then finally my mass vhost block. So for a domain that doesn't match the first two ServerName's and has no corresponding directory in /var/www/vhosts/ I'd expect it to fall-over to the first vhost, however with this setup, all domains resolve to my default site-not-found. Why is this? By putting the mass-vhost block first, I can get the mass-vhosts to resolve properly, but not my site-not-found vhost... and in this case I can't seem to find a way to distinguish between a page-level 404 in the vhost, and the case where the VirtualDocumentRoot fails to find a vhost directory (this appears to use the 404 also). Any help out of this bind is much appreciated!

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• How do you import Firefox/Chrome bookmarks into Google Bookmarks?

  - by Rick

  How do you import Firefox/Chrome bookmarks into Google Bookmarks? It looks like Google Bookmarks has some wonderful features, but it doesn't let people import their existing bookmarks from their browsers be it Firefox, Chrome or Internet Explorer. There used to be workarounds for this, but no more: http://googlesystem.blogspot.com/2011/01/google-bookmarks-import-without-google.html Can anyone think of a good way to pull this off?

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• can't connect to vsftpd from outside network

  - by rick

  i know this has been asked many times before, but nothing seems to resolve my issue. i have vsftpd running on ubuntu 10.04. i can connect with ftp localhost on the machine. i can connect from another machine in my network. i just cannot connect from outside. the machine is behind an airport extreme managed by airport utility on a mac. 21 is open as per nmap: macmini:~$ nmap localhost Starting Nmap 5.21 ( http://nmap.org ) at 2011-04-10 23:49 EDT Nmap scan report for localhost (127.0.0.1) Host is up (0.00045s latency). Hostname localhost resolves to 2 IPs. Only scanned 127.0.0.1 rDNS record for 127.0.0.1: localhost.localdomain Not shown: 997 closed ports PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 631/tcp open ipp netstat says 21 is listening: macmini:~$ netstat -lep --tcp | grep ftp (Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) tcp 0 0 *:ftp *:* LISTEN iptables: macmini:~$ sudo iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination when i try to connect from my external IP (or a dyndns name which resolves there) it times out. ("control connection timed out") as i know very little about networking, i feel like something may jump out as clearly wrong?

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