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• which virtualization technology is right for me?

  - by Chris

  I need a little help with this getting this sorted out. I want to setup a linux virtual server that I can use to run both sever and desktop systems. I want a linux system that is minimalist in nature as all the main os will be doing is acting as a hypervisor. The system I'm trying to setup will be running a file server, windows 7, ubuntu 10.04, windows xp and a firewall/gateway security system. All the client OS'es accessing and storing files on the file server. Also all network traffic will be routed through the gateway guest os. The file sever will need direct disk access while the other guests can run one disk images. All of this will be running on the same computer so I wont be romoting in to access the guests OS'es. Also if possible I would like to be able to use my triple head setup in the guest OS'es. I've looked at Xen, kvm and virtualbox but I don't know which is the best for me. I'm really debating between kvm and virtual box as kvm seem to support direct hardware access.

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• Debian grub2 update removed Windows boot option.

  - by Wrikken

  Since I updated grub to grub 2 I no longer get the option to boot to Windows (which is unfortunately sometimes necessary for proprietary MSIE browser plugins I need to use for work). Relevant /boot/grub/menu.lst portion: ### END DEBIAN AUTOMAGIC KERNELS LIST # This is a divider, added to separate the menu items below from the Debian # ones. title Other operating systems: root # This entry automatically added by the Debian installer for a non-linux OS # on /dev/hda1 title Windows NT/2000/XP root (hd0,0) savedefault makeactive chainloader +1 This however does not appear anymore. I do have some entries in /boot/grub/grub.cfg with entries like these: menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-amd64' --class debian --class gnu-linux --class gnu --class os { insmod part_msdos insmod ext2 set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set e638c434-4884-412f-a141-2c194f881fae echo 'Loading Linux 2.6.32-5-amd64 ...' linux /boot/vmlinuz-2.6.32-5-amd64 root=UUID=e638c434-4884-412f-a141-2c194f881fae ro quiet echo 'Loading initial ramdisk ...' initrd /boot/initrd.img-2.6.32-5-amd64 } Do I have to alter that file? If so, what is the correct syntax for a Windows boot? If not, what could be the problem?

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• Running WAMP (XAMPP) and LAMP from One SSD, On 64-bit Windows and Linux Machines

  - by nicorellius

  I have an solid state drive that I develop websites on. The reason I do this is because I work on a few different computers. Historically, I created separate developing environments to use for each machine. This was OK, but if the system changed for some reason, eg, new OS install, it was a pain. So I bought a USB 3.0 enclosure and put a solid state drive in there and it's pretty darn fast, which is good. I was working with three Windows machines and I could simply hook up the drive, launch my XAMPP server and away I went, developing websites: using Dreamweaver, Komodo, Notepad++, Eclipse, etc. Recently, however, one of my Windows machines' hard drive went down and instead of going back to Windows in this case, I went with Ububntu 12.04. I have several Ubuntu workstations and servers and I like Linux, so I thought his was a great opportunity to transition. I went to work installing and trying to set up a LAMP server and, besides from XAMPP 64-bit compatibility out of the box, I'm seeing other issues with getting this Linux server running. I will keep trying to resolve this, but in the meantime... my question is, has anyone ever successfully run both WAMP and LAMP from the same SSD (formatted to NTFS)? I'm sure there are lots of barriers to this happening, like local file system, OS libraries, dependencies, etc. But I was thinking it would be cool if it could be done. I'm no expert, so if this is just plain old stupid, please don't hesitate to let me know.

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• How to Dual-Boot Kali-Linux and Windows 8.1?

  - by Ceyhun

  I have Acer V3-772G 1 TB Harddisk. I shrinked my biggest partition in order to install Kali Linux. When installing Kali, GRUB couldn't detect windows 8 so I kept going on(I installed grub as my masterboot). After installed Kali there was no way to boot Windows 8.1, but booting Kali was OK with GRUB in legacy-BIOS. When I tried to change bios to UEFI it couldn't find any OS (took too much time, nearly 1 hour). So I tried to update GRUB with boot-repair within a Ubuntu Live USB. But after updating GRUB I terrified, in UEFI and Legacy mode grub couldn't find ANY OS (Both Kali and Windows) so I have no option other than using Ubuntu Live. I tried every possible options but nothing has worked for me. I tried rEFInd in UEFI mode it worked only for Kali. I still cannot boot my windows 8.1 . I considered to restore to factory setting with a Windows Rescue USB but kept telling me "No driver found". Please help me to dual boot or remove Kali and restore my Windows 8.1

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• Monitor attached to motherboard is out of frequency

  - by Neilvert Noval

  I don't know if this is appropriate to ask it here in superuser. Please, just route this to appropriate stackexchange site if found unrelevant. Here's my scenario. I have bought a new motherboard (MSI 785GT-E63). I already have an old CRT monitor connected to it. After I install a linux OS to it, my monitor will display that it is: Out of frequency. Current frequency is 89Hz. The operating output of my monitor is (around) 60-70Hz. I would like to get this thing work. How can I let my CRT display properly? I was thinking of lowering down video frequency output of my motherboard, but I can't find any settings on my BIOS setup. Additional info: My monitor is attached directly to the built-in video adaptor of my motherboard. (No additional video cards) Install of OS is complete without errors. Please help.

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• Disable internal display on Macbook Pro without closed lid mode?

  - by jslaker

  I have an early 2007 Macbook Pro running 10.5 that I've recently set up on a KVM with my primary desktop system. The problem I've run into is that I have a 20" 1680x1050 LCD, and OS X only provides options to mirror at the resolution of the built-in display or to span. Since the built-in display runs at 1440x900, this leads to running my LCD at non-native res and a fuzzy picture. There isn't any option that I can find to simply disable the built-in display entirely and run the external LCD at its native resolution. I am aware of closed lid mode, but the MBP was disassembled while in storage for about 6 months (took it apart to pull the HDD) and the cable to the touchpad, which controls the sleep sensor was damaged, meaning closed lid mode won't work. I've looked into replacing the cable, but the cheapest I've been able to find it is $75-100, and I'm trying not to invest any more money into this computer as it also has a completely dead battery and a few other minor problems. I've found the app SwitchResX which appears to allow you to do what I need, but it has a lot of functionality I don't need and a ~$20 registration charge attached to it. An odd set of circumstances, I'm aware, but I was hoping somebody might know of an OS hack that would let me just disable the internal display and be done with it. :)

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• Is there any functional-like unix shell?

  - by Caruccio

  I'm (really) newbie to functional programming (in fact only had contact with it using python) but seems to be a good approach for some list-intensive tasks in a shell environment. I'd love to do something like this: $ [ git clone $host/$repo for repo in repo1 repo2 repo3 ] Is there any Unix shell with these kind of feature? Or maybe some feature to allow easy shell access (commands, env/vars, readline, etc...) from within python (the idea is to use python's interactive interpreter as a replacement to bash). EDIT: Maybe a comparative example would clarify. Let's say I have a list composed of dir/file: $ FILES=( build/project.rpm build/project.src.rpm ) And I want to do a really simple task: copy all files to dist/ AND install it in the system (it's part of a build process): Using bash: $ cp ${files[*]} dist/ $ cd dist && rpm -Uvh $(for f in ${files[*]}; do basename $f; done)) Using a "pythonic shell" approach (caution: this is imaginary code): $ cp [ os.path.join('dist', os.path.basename(file)) for file in FILES ] 'dist' Can you see the difference ? THAT is what i'm talking about. How can not exits a shell with these kind of stuff build-in yet? It's a real pain to handle lists in shell, even its being a so common task: list of files, list of PIDs, list of everything. And a really, really, important point: using syntax/tools/features everybody already knows: sh and python. IPython seams to be on a good direction, but it's bloated: if var name starts with '$', it does this, if '$$' it does that. It's syntax is not "natural", so many rules and "workarounds" ([ ln.upper() for ln in !ls ] -- syntax error)

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• Customizing tmux status to represent current working directory and files

  - by user69397

  I've been playing with this for a couple of days, so I'm sure I'm missing something simple. Love tmux. Using it for development and have so many windows I need a better way of distinguishing them in the status bar and in the buffer list. Seeing a list of "bash" and "vim" isn't really helpful at all. And since they're all on the same host - don't care about the hostname right now. I'd like to show the current working directory, and the file being worked on. For example when I view the list of buffers I currently see: (0) 0: vim [100x44] (1 panes) "murph" (1) 1: vim [100x44] (1 panes) "murph" (2) 2: bash- [100x44] (1 panes) "murph" (3) 3: bash* [100x44] (1 panes) "murph" Here's what I'd like to see 0:vim main.py ~/devl/project1 1:vim index.html ~/devl/samples/staticfiles 2:bash ~/devl/sandbox 3:bash ~/.vimrc I'd like to see similar info in the status bar for each individual window. While I am able to get PWD to show up in the status bar of a window, it's only the working directory from where tmux was launched. This isn't any help as I change directories. I'm hoping this can be done without a bunch of scripts. Thanks all.

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• HD working with IDE USB adapter but not recognised by bios

  - by Rajeeva

  I have a Windows XP Pentium III desktop with two hard drives. The first one has the OS and is luckily working. The second drive on the secondary master IDE channel few days back was unable to read some files and since then for some time it was failing and reviving intermittently and now it is always showing as failed on the IDE channel When the HD was intermittenly failing, I was able to copy some data from it to the other drive - also during that time if the system was running and the hard disk failed at that time, the system froze and then i had to reboot. then I got a new 80 gb hdd similar (same make - seagate barracuda) to the earlier failing one, a new data cable for the drive and an IDE to USB adapter. the new hard drive i installed in the previous drive's place (secondary master), formatted it and it worked for 1 day and then it also failed - simultaneously i connected the old hd to the IDE/USB adapter and i could view all the data - some of that data i was able to back up from the old hd to the new hd before the new hd failed the new hd i have tried connecting on the primary channel as the slave disk but when i do that then the bios does not detect either the OS drive or the new drive and the system does not boot surprisingly, the older (previously failed) hd and the new hd are both working fine on the usb channel with the IDE/USB adapter. i have ruled out any problem with the secondary channel since the dvd rom i was earlier using as primary slave have now connected to secondary master and it works fine. i am really confused by this behavior on my system. please can anybody try to solve this for me. thanks.

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• Repair Windows 2008 boot

  - by aksamit

  I have been caught in a loop where I can't boot up Windows Server 2008. When the OS starts to boot I am presented two options: Launch Startup Repair (recommended) Start Windows Normally No matter what option is chosen I end up with a black screen stating "Windows is loading files..." which takes approx 15 minutes until "System Recovery" is started. I try to run the "Startup Repair" but it reports the following error: Problem Event Name: StartupRepairOffline Problem Signature 01: 0.0.0.0 Problem Signature 02: 0.0.0.0 Problem Signature 03: unknown OS Version: 6.1.7600.2.0.0.256.1 Locale ID: 1033 Actually no matter what other options I would try in the System Recovery they would also report some kind of error. Some other logging I have been able to extract: Diagnosis and repair details: Number of repair attempts: 1 Session details System Disk = Windows directory = AutoChk Run = 0 Number of root causes = 1 Test Performed: Name: System disk test Result: Completed successfully. Error code = 0x0 Root cause found: A hard disk could not be found. If a hard disk is installed, it is not responding. So it is actually stating that Harddisk could not be found... which to me seems to be a bit contradictious since the System Recovery just loaded all files from the hard disk it now states it cannot find. Any ideas on what other options I have?

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• How to find out which process is hogging the linux server?

  - by user1149518

  We have a RHEL server. Today it suddenly became slow. Symptoms - It was responding slow to ping queries from other server. When I try to login using ssh, it was taking about 10 seconds to login. I was able to resolve the problem by doing some guess work. I killed one process which I thought was culprit. Which resolved the problem. Though I would like to know what's proper approach to detect the culprit in such kind of "slow server" situations. Le me know proper way to resolving such slowness issues and decting the process causing the slowness. These were the conditions when the server was slow - # vmstat 3 3 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 1 176 6730868 285052 4899676 0 0 3 4 0 0 1 1 97 1 0 0 0 176 6751576 285064 4899704 0 0 0 115 15307 37171 1 1 96 3 0 0 0 176 6751948 285068 4899700 0 0 0 23 14813 39559 1 1 98 1 0 # top top - 16:38:18 up 150 days, 19:36, 64 users, load average: 1.68, 1.46, 1.44 Tasks: 1287 total, 2 running, 1284 sleeping, 1 stopped, 0 zombie Cpu(s): 1.3%us, 1.7%sy, 0.1%ni, 95.9%id, 0.7%wa, 0.0%hi, 0.2%si, 0.0%st Mem: 16620824k total, 9867124k used, 6753700k free, 287424k buffers Swap: 8193140k total, 176k used, 8192964k free, 4898996k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 26258 khk 34 19 130m 47m 7088 S 11.2 0.3 385:32.42 edm Though I would like to know what's proper approach to detect the culprit in such kind of "slow server" situations. Le me know proper way to resolving such slowness issues and decting the process causing the slowness.

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• Run Python script at startup using upstart

  - by MarcusMaximus

  I'm trying to create an upstart script to run a python script on startup. In theory it looks simple enough but I just can't seem to get it to work. I'm using a skeleton script I found here and altered. description "Used to start python script as a service" author "Me <[email protected]>" # Stanzas # # Stanzas control when and how a process is started and stopped # See a list of stanzas here: http://upstart.ubuntu.com/wiki/Stanzas#respawn # When to start the service start on runlevel [2345] # When to stop the service stop on runlevel [016] # Automatically restart process if crashed respawn # Essentially lets upstart know the process will detach itself to the background expect fork # Start the process script exec python /usr/local/scripts/script.py end script The test script I want it to run is currently a simple python script that runs without any issue when run from a terminal. #!/usr/bin/python2 import os, sys, time if __name__ == "__main__": for i in range (10000): message = "UpstartTest " , i , time.asctime() , " - Username: " , os.getenv("USERNAME") #print message time.sleep(60) out = open("/var/log/scripts/scriptlogfile", "a") print >> out, message out.close() The location/var/log/scripts has permissions 777 The file /usr/local/scripts/script.py has permissions 775 The upstart script /etc/init.d/pythonupstart.conf has permissions 755

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• System x3550 M2 stuck on system initializing after firmware upgrades

  - by itmanager223

  Hey guys so i have been having this major issue for the last few hours now. I have a system x 3550M2 server and i ran the UEFI and IMM firmware upgrades within windows server 2008 R2 x64. All upgrades went fine and i was told to reboot. I performed the reboot cleanly using the OS restart option. Upon restarting it showed the system initializing screen and it stayed there for a good hour. After that hour i figured it froze and so i powered down and power up again. Now i can not boot back up to even see the IBM splash screen or the OS... I have tried switching the Jumpers to go to the backup UEFI and backup IMM and no luck. I have also reset the CMOS power and i have pressed the reset button 3 times on the light path and no luck. There are no lights light on the light path to indicate anything is broken. The only thing i see on the light path is the number 0.5. Any ideas guys i am quite stumped with this problem. Thanks a lot, Dani Cela

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• memory usage setting

  - by user127610

  everybody,the memory usage is too much,what can i do? top - 12:54:37 up 7 days, 4:38, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 18 total, 2 running, 16 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1048800k total, 917424k used, 131376k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 15 0 2840 1364 1204 S 0.0 0.1 0:02.17 init 1161 root 14 -4 2320 600 420 S 0.0 0.1 0:00.00 udevd 1391 root 18 0 35512 1288 948 S 0.0 0.1 0:03.53 rsyslogd 1409 root 15 0 8432 1164 700 S 0.0 0.1 0:03.87 sshd 1416 root 18 0 3156 868 692 S 0.0 0.1 0:00.00 xinetd 1423 root 18 0 8672 716 292 S 0.0 0.1 0:00.00 saslauthd 1424 root 18 0 8672 488 64 S 0.0 0.0 0:00.00 saslauthd 1431 root 15 0 7020 1168 616 S 0.0 0.1 0:00.99 crond 1450 root 25 0 6236 1444 1228 S 0.0 0.1 0:00.05 sh 3328 mysql 15 0 799m 42m 4892 S 0.0 4.1 0:02.07 mysqld 15479 root 15 0 11304 3332 2688 R 0.0 0.3 0:00.06 sshd 15482 root 15 0 6372 1688 1404 S 0.0 0.2 0:00.00 bash 15497 root 15 0 2536 1044 864 R 0.0 0.1 0:00.00 top 20137 www 15 0 20672 14m 864 S 0.0 1.4 0:00.87 nginx 22351 www 16 0 52324 26m 9244 S 0.0 2.6 0:13.94 php-fpm 24231 www 16 0 51928 25m 9260 S 0.0 2.5 0:13.52 php-fpm 32682 root 15 0 35832 3228 864 S 0.0 0.3 0:02.18 php-fpm 32686 root 18 0 7368 1616 888 S 0.0 0.2 0:00.00 nginx

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• Mysterious swap usage on EC2

  - by rusty

  We're in the middle of a project to move our infrastructure from a co-lo situation into Amazon EC2 and we've noticed some weird memory characteristics of the processes in our setup. Without going into too much detail about the specifics of our processes, we've noticed that on our EC2 instances "top" will show processes using a lot of swap space -- in fact, much greater than the amount of available swap or (if you add it all up) more than the available disk. Here's a sample top output: Mem: 7136868k total, 5272300k used, 1864568k free, 256876k buffers Swap: 1048572k total, 0k used, 1048572k free, 2526504k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ SWAP COMMAND 4121 jboss 20 0 5913m 603m 14m S 0.7 8.7 3:59.90 5.2g java 22730 root 20 0 2394m 4012 1976 S 2.0 0.1 4:20.57 2.3g PassengerHelper 20564 rails 20 0 2539m 220m 9828 S 0.3 3.2 0:23.58 2.3g java 1423 nscd 20 0 877m 1464 972 S 0.0 0.0 0:03.89 876m nscd You can see, for instance, that jboss is reportedly using 5.2 gigs of swap space which is definitely impossible since there's only 1G allocated and none is being used (probably because there's still 1.8G of RAM free). And here's the results of uname -a: Linux xxx.yyy.zzz 2.6.35.14-106.53.amzn1.x86_64 #1 SMP Fri Jan 6 16:20:10 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux We're running an AMI based off of the default Amazon Linux AMI (Amazon Linux AMI release 2011.09, so some RHEL5 and RHEL 6) with not too many customizations and definitely no kernel-level customizations. Something here tells me that on this particular kernel/distribution, the reporting of swap or maybe even total memory usage isn't what it appears to be... Any help would be appreciated!

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• PassEnv does not find ENV variables

  - by quodlibetor

  I've got this /etc/profile.d/myfile.sh: export MYVAR=myval I also have a PassEnv MYVAR line in a <virtualhost> section of an apache conf dir. That lets me do things like: $ echo $MYVAR myval $ python >>> import os; os.getenv('MYVAR') 'myval' $ sudo echo $MYVAR myval $ sudo -i root# echo $MYVAR myval But then, despite that being the case I get: root# /sbin/service httpd restart /sbin/service httpd restart Stopping httpd: [ OK ] Starting httpd: [Mon Oct 22 14:44:02 2012] [warn] PassEnv variable MYVAR was undefined [ OK ] And all of my attempts to access MYVAR from within my wsgi scripts just don't work. Thoughts? Am I doing something obviously wrong? EDIT for more detail I've got a swarm of computers/VMs and a swarm of developers working on a swarm of projects. I need a simple central place to keep environment information, the most common is the "environment" (dev/stage/prod). The scheme that we've got (modifying *.wsgi programmatically) is turning out to be more fragile than we'd like. The main options that I see are: put things in the shell environment put things in other config files Getting things into the shell environment is the best, because we won't need to write yet more duplicated "what is my environment" code.

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• How does one skip “Windows did not shut down successfully” in Win7-64?

  - by XenonofArcticus

  Migrating an app from an expensive and unreliable dedicated embedded x86 box running WinXP-embedded to COTS hardware (Dell E6410 laptop) running normal Win7-64. At this time, it's not feasible to deploy using Windows 7 embedded. The problem is, that the system is still sort of "embedded". The power could shut off at virtually any time without prior warning. We've stripped the OS down and removed the battery capability so that it will power down as desired. The app never writes to the disk, so it's not like we're going to corrupt anything terribly. The system is essentially idle after our app is up and running (with the exception of some computation, graphics, and TCP/IP and serial communications) so the OS enters a pretty stable state rather quickly. After a power-loss however, it rightly complains that Windows did not shut down successfully and presents the user with the Windows Error Recovery text screen. If left alone, it does eventually move on booting just fine, but we'd like to skip that step if possible. WinXP-embedded is designed to do this automatically, so I know it's possible. I've looked at the Kernel Switches but I didn't see anything documented for "Skip Windows Error Recovery". I've also read extensively on the startup process: http://homepage.ntlworld.com./jonathan.deboynepollard/FGA/windows-nt-6-boot-process.html I know I can disable the auto chkdsk in the registry, but that's not the same thing either. So, how do I streamline the boot process to not hassle the user about a situation that will be the regular normal situation?

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• Truecrypt and hidden volumes

  - by user51166

  I would like to know the opinion of some users using (or not) the hidden volume encryption feature of Truecrypt. Personally until now I never used this feature: on Windows I encrypt the system drive as a standard volume, on GNU/Linux I encrypt using LUKS which is Truecrypt's equivalent to standard volume. As for data I use the standard volume approach as well. I read that this feature is nice and all, but it isn't really used by most people. Do you use it or not? Why? Do you only store inside it VERY sensible data or what else? Because technically speaking doing a hidden volume which has (almost) the same size as the outer one doesn't make sense: the outer volume will be encrypted but no data will be on it, which will appear very strange. So not only one has to plan which data store where, but has even to remember each time to mount the outer volume with hidden volume protection (otherwise there'll be a data loss when writing to it). It's a bit messy: hidden OS + outer OS + outer volume + hidden volume = 4 partitions :( Similar question about the hidden operating system (which I don't use [yet]).

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• MysqlTunner and query_cache_size dilemma

  - by wbad

  On a busy mysql server MySQLTuner 1.2.0 always recommends to add query_cache_size no matter how I increase the value (I tried up to 512MB). On the other hand it warns that : Increasing the query_cache size over 128M may reduce performance Here are the last results: >> MySQLTuner 1.2.0 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.5.25-1~dotdeb.0-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in InnoDB tables: 6G (Tables: 195) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [!!] Total fragmented tables: 51 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 1d 19h 17m 8s (254M q [1K qps], 5M conn, TX: 139B, RX: 32B) [--] Reads / Writes: 89% / 11% [--] Total buffers: 24.2G global + 92.2M per thread (1200 max threads) [!!] Maximum possible memory usage: 132.2G (139% of installed RAM) [OK] Slow queries: 0% (2K/254M) [OK] Highest usage of available connections: 32% (391/1200) [OK] Key buffer size / total MyISAM indexes: 128.0M/92.0K [OK] Key buffer hit rate: 100.0% (8B cached / 0 reads) [OK] Query cache efficiency: 79.9% (181M cached / 226M selects) [!!] Query cache prunes per day: 1033203 [OK] Sorts requiring temporary tables: 0% (341 temp sorts / 4M sorts) [OK] Temporary tables created on disk: 14% (760K on disk / 5M total) [OK] Thread cache hit rate: 99% (676 created / 5M connections) [OK] Table cache hit rate: 22% (1K open / 8K opened) [OK] Open file limit used: 0% (49/13K) [OK] Table locks acquired immediately: 99% (64M immediate / 64M locks) [OK] InnoDB data size / buffer pool: 6.1G/19.5G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance Reduce your overall MySQL memory footprint for system stability Increasing the query_cache size over 128M may reduce performance Variables to adjust: *** MySQL's maximum memory usage is dangerously high *** *** Add RAM before increasing MySQL buffer variables *** query_cache_size (> 192M) [see warning above] The server has 76GB ram and dual E5-2650. The load is usually below 2. I appreciate your hints to interpret the recommendation and optimize the database configs.

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• Changing the View of a Folder When It Is Opened from Finder

  - by user60044

  When I was running OS 10.4 I had all my folders beautifully organized with position and which ones should be opened in View mode and which one in Icon, etc. When I transitioned to 10.6 I found that OS ignored all that information and imposes an awful consequence of changing the view for some folder and that view moving up to all parent folders which don't have their views locked. The only way I can think of to get this functionality back is to either write a program that given a root directory will enumerate it setting the views based upon a static template I have. The other way I thought I could accomplish this is by Folder Actions. Aside from the fact that I don't know AppleScript it seems folder actions cannot be inherited. Since I have 1000s of folders involved here, all being inherited from a single root, I could not possibly manually add that action to each of those folders. What I would like to have is a folder action that whenever I open the folder from Finder, then if it contains any JPG, GIF, etc. type image files that it will automatically open that folder with a view of Icon with a reasonable size to support the number of images. If the folder contains only folders, then to open that folder in the list view. Does anyone have anything that could do this for me? Thank You, -- Mark

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• What I should know about memory management?

  - by bua

  first of all: I don't use stackadmin or similar so please don't vote for moving there, I'm reading man top and paper "what every programmer should know about memory ..." I need really simple explanation like for retard ;) Having following top dump: top - 11:21:19 up 37 days, 21:16, 4 users, load average: 0.41, 0.75, 1.09 Tasks: 313 total, 5 running, 308 sleeping, 0 stopped, 0 zombie Cpu(s): 0.4%us, 0.6%sy, 0.9%ni, 96.2%id, 0.1%wa, 0.0%hi, 1.9%si, 0.0%st Mem: 132103848k total, 131916948k used, 186900k free, 54000k buffers Swap: 73400944k total, 73070884k used, 330060k free, 13931192k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3305 tudb 25 10 144m 52m 940 R 6.0 0.0 1306:09 app 3011 tudb 15 0 71528 19m 604 S 3.3 0.0 171:57.83 app 3373 tudb 25 10 209m 93m 940 S 3.0 0.1 1074:53 app 3338 tudb 25 10 144m 47m 940 R 2.7 0.0 780:48.48 app 4227 tudb 25 10 208m 99m 904 S 1.3 0.1 198:56.01 app 8506 tudb 25 10 80.7g 49g 932 S 2.0 39.6 458:31.22 app I'm wondering what is: RES (my expl. physical memory consumption ? see 49GB) VIRT (memory mapped disk to cache? see 80GB) SHR (shared pages?) Swap: (is this cached label - for memory mapped disk into swap cache?) Should sum of RES give MEM: X used? or maybe sum of VIRT?

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• java memory allocation under linux

  - by pstanton

  I'm running 4 java processes with the following command: java -Xmx256m -jar ... and the system has 8Gb memory under fedora 12. however it is apparently going into swap. how can that be if 4 x 256m = 1Gb ? EDIT: also, how can all 8Gb of memory be used with so little memory allocated to basically the only thing running? is it java not garbage collecting because the OS tells it it doesn't need to or what? TOP: top - 20:13:57 up 3:55, 6 users, load average: 1.99, 2.54, 2.67 Tasks: 251 total, 6 running, 245 sleeping, 0 stopped, 0 zombie Cpu(s): 50.1%us, 2.9%sy, 0.0%ni, 45.1%id, 1.1%wa, 0.0%hi, 0.8%si, 0.0%st Mem: 8252304k total, 8195552k used, 56752k free, 34356k buffers Swap: 10354680k total, 74044k used, 10280636k free, 6624148k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1948 xxxxxxxx 20 0 1624m 240m 4020 S 96.8 3.0 164:33.75 java 1927 xxxxxxxx 20 0 139m 31m 27m R 91.8 0.4 38:34.55 postgres 1929 xxxxxxxx 20 0 1624m 200m 3984 S 86.2 2.5 183:24.88 java 1969 xxxxxxxx 20 0 1624m 292m 3984 S 65.6 3.6 154:06.76 java 1987 xxxxxxxx 20 0 137m 29m 27m R 28.5 0.4 75:49.82 postgres 1581 root 20 0 159m 18m 4712 S 22.5 0.2 52:42.54 Xorg 2411 xxxxxxxx 20 0 309m 9748 4544 S 20.9 0.1 45:05.08 gnome-system-mo 1947 xxxxxxxx 20 0 137m 28m 27m S 13.3 0.4 44:46.04 postgres 1772 xxxxxxxx 20 0 135m 25m 25m S 4.0 0.3 1:09.14 postgres 1966 xxxxxxxx 20 0 137m 29m 27m S 3.0 0.4 64:27.09 postgres 1773 xxxxxxxx 20 0 135m 732 624 S 1.0 0.0 0:24.86 postgres 2464 xxxxxxxx 20 0 15028 1156 744 R 0.7 0.0 0:49.14 top 344 root 15 -5 0 0 0 S 0.3 0.0 0:02.26 kdmflush 1 root 20 0 4124 620 524 S 0.0 0.0 0:00.88 init 2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0 4 root 15 -5 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/0

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• Hardware testing tool/suite

  - by Aviator

  Hi All, I just bought a new core i5 system (assembled) and started installing Windows 7. It was failing for many times and at some point got installed. After that, frequent crashes related to MEMORY. So checked the RAM using memtest86+ and found many errors.I got it replaced with the vendor and now if i install ANY OS, at some point in installation it either freezes completely with no response for hours, or restarts automatically. I tried installing Windows 7, Windows Vista and Ubuntu 9.10. I tested the new RAM again and found no problems in about 2 passes using memtest86+. I even updated the BIOS using bootable USB and even the problem persists. I am really not sure which hardware is causing trouble. I dont have any OS inside it, so i have to check using bootable CDs DVDs and USB only. Please advice on how to proceed. Are there any suites/ separate tools for checking integrity of each hardware parts and troubleshoot it? I wanted to confirm which part is problematic before going for replacement. Thanks a lot! This is the config: Core i5, MSI P55-GD65, GSKill 2x2GB, Seagate 500GB 7200rpm, CM Extreme 600W PSU, Saphhire Radeon 5770 1GB, LG DVD Writer

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• processing of Group Policy failed only on 2008 Servers and Name Resolution failure on the current domain controller

  - by Ken Wolfrom

  Spent last 3 months doing a upgrade from 2003 domain to a 2008R2 domain. our last DC was rebuilt (5 total) and brought up on line. After it was put on line we have some 2008 and 2008R2 servers (10 now) getting these errors in the event logs. ERRORS Description: The processing of Group Policy failed. Windows could not resolve the user name. This could be caused by one of more of the following: a) Name Resolution failure on the current domain controller. b) Active Directory Replication Latency (an account created on another domain controller has not replicated to the current domain controller).\ Can duplicate this if we drop to command prompt and run GPUPDATE manually When our users attempt to do a \directory\shared access to shared drive on an affected server get this error.– “THERE ARE CURRETLY NO LOGON SERVER AVAIALBE TO SERICE THE LOGON REQUEST. This is only affecting the 2008 OS and it is a random set of abotu 10 servers out of some 30 with this OS. The Services on the machines are running Ok and login. Able to log in with domain/user to the consoles and via RDP. WE can log onto an affected machine, and can get to the \domainname\sysvol and can see the GPO's Have checked the replication topology of the domain and it states all servers can replicate with no errrors. We went back to the last DC, demoted it, removed DNS and then removed it from the domain and waited 24 hours and issue still persist. Picked one server, removed it from domain, reboooted, and added back to domain with no problems, but still has this behavior. bottom line is we have some servers that the domain will not let any UDP/client server apps or GPO's process ,but the tcp related items seeme to work fine, http, tcp calls, sql and oracle dbs's connect and process. Any inputs on some possible reasons for this issue and fixes. It is only affecting the 2008 servers on a 2008R2 domain.

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• How to decouple development server from Internet?

  - by intoxicated.roamer

  I am working in a small set-up where there are 4 developers (might grow to 6 or 8 in cuople of years). I want to set-up an environment in which developers get an internet access but can not share any data from the company on internet. I have thought of the following plan: Set-up a centralized git server (Debian). The server will have an internet access. A developer will only have git account on that server, and won't have any other account on it. Do not give internet access to developer's individual machine (Windows XP/Windows 7). Run a virtual machine (any multi-user OS) on the centralized server (the same one on which git is hosted). Developer will have an account on this virtual machine. He/she can access internet via this virtual machine. Any data-movement between this virtual machine and underlying server, as well as any of the developer's machine, is prohibited. All developers require USB port on their local machine, so that they can burn their code into a microcontroller. This port will be made available only to associated software that dumps the code in a microcontroller (MPLAB in current case). All other softwares will be prohibited from accessing the port. As more developers get added, providing internet support for them will become difficult with this plan as it will slow down the virtual machine running on the server. Can anyone suggest an alternative ? Are there any obvious flaws in the above plan ? Some key details of the server are as below: 1) OS:Debian 2) RAM: 8GB 3) CPU: Intel Xeon E3-1220v2 4C/4T

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