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  • Free-space driven log rotation on linux?

    - by kdt
    Someone just asked me 'how long should we keep logs for our application', and my answer was 'until the disk is full' as there's no reason to throw them away other than running out of space. However, standard logrotate wants us to specify a specific period + number of rotations. Is there something similar that would let us say "rotate daily, and keep as much history as you like until there is only 5% space free"? The platform is Redhat Linux.

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  • eTrayz: Replace base system with a bootstrapped Debian

    - by knoopx
    I bought an eTrayz NAS time ago. The device is more or less good but it ships with a closed-source custom linux and a bunch of broken web-apps. I wanted to replace the whole system with a raw Debian installation. I successfully bootstrapped a Lenny Debian into a chroot and I'm able to use use it. However I would like it to be the default system and to boot automatically at login. The device itself ships with a bundled 2.6.24.4 kernel. I think the kernel is on a dedicated flash memory so I would prefere not to re-flash it. What do you think is the best way to accomplish it?

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  • Bacula optimization/profiling tools

    - by pufferfish
    I'm trying to get an idea of where the bottlenecks are in our backup system. Are there tools available for profiling this? If not, any pointers to a home grown method would also help. I guess most of the info would be in the bacula logs, but I'd also like to see things like what gets saturated during despooling: disk, CPU or network? This feels like a problem most bacula admins would have encountered.

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  • Windows 7duplicate in boot menu

    - by Mick
    I deploy my Windows 7 with imagex.exe. I do this by means some batch script : Win7_install.bat: cls Diskpart /s Win7_install.txt Imagex /apply Win7_October.wim 1 C: Bcdboot C:\Windows Exit Win7_install.txt: SELECT DISK 0 CLEAN CREATE PARTITION PRIMARY SIZE=102400 SELECT PARTITION 1 FORMAT fs=ntfs LABEL=”SYSTEM” quick ASSIGN LETTER=C CREATE PARTITION PRIMARY SELECT PARTITION 2 FORMAT fs=ntfs LABEL=”DATA” quick SELECT PARTITION 1 ACTIVE EXIT Then after restart I have duplicate entries in boot menu. Anybody have some idea how fix it? Regards

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  • Erase personal date from corporate laptop

    - by microspino
    Hello I need to delete my data from the company laptop. Nothing special just 2 or 3 folders (I hava a Dropbox on this pc) and I'd like to be sure they are gone. I read about free tools and bootable cd to erase the entire disk, I don't need those but just a free tool to put some zeros wehere my data were before.

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  • How to monitor streaming servers

    - by pcdinh
    Hi all, I have had a bunch of Linux based streaming servers that employed lighttpd web server to provide video streaming via port 80. Recently, our service is very slow. Therefore, I would like to ask if there is a good software package that helps us monitor and record our bandwidth usage, lighttpd established connections, TCP sync connections, disk I/O ... over time. Any suggestions? Regards, Dinh

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  • restore -A usage

    - by Martin v. Löwis
    I have created a number of dump files using Linux dump(8), using the -A option to get a table of contents on disk (the backups are on tape). Now I'm trying to look into these archive files, using restore -i -A <archive>` However, this insists on asking what tape to use, and complains if I say none. What am I doing incorrectly? I was hoping that I can use these archive index files without having to insert the tape to use.

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  • ZFS recordsize for VirtualBox and other virtual disks

    - by JOTN
    Has anyone run across any good benchmarks or other research on tuning the ZFS recordsize when putting virtual disk files on it for a guest OS? I'm using VirtualBox at the moment. I have notice significant performance improvement when working with a DBMS by setting the ZFS recordsize to the same as the DB blocksize, so I'm guessing matching the blocksize of the guest filesystem would also be a good idea.

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  • Does SDHC have any write (ECC) error recovery ?

    - by marc
    What happen if SDHC card get write error (damaged cell / bad sector) ? Whole card is unusable (to trash, all data written to that sector now and in future will be lost) ? or rewrite sector (flash memory get corrupted when writing so maybe have any function to check if sector was written successfully) to another and mark as fault as unusable what will be seen as reduction of capacity but no data lost. I have to do some research about SD card-s on disk less machines. regards

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  • Streaming audio/video in a publicly-hosted server increases bandwith usage

    - by Eka
    I have a website hosted in a public server (withoud any streaming content) ,using public hosting instead of private because its cheaper. But in public hosting their are limitations when compared to private hosting such as monthly bandwidth usage (1 GB), disk space, cpu usage etc. I am planning to embedd videos and audios (from other websites like youtube) to my already existing website. My question is if a client streams a embedded video/audio (hosted in another website) from my website any change in bandwidth occurs.

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  • Can I use BitLocker on a Windows 8 Tablet? How?

    - by Coderer
    I hear that Windows 8 Pro can use full disk encryption. I also understand that Win8 is targeting the "slate" / "tablet" form factor specifically. But all my previous experience with BitLocker requires you to put in some kind of PIN or password at boot time -- how can I do this without a (hardware) keyboard? This preview of an upcoming Win8 tablet mentions BitLocker but doesn't address the PIN issue. Am I missing something?

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  • OSX Mail.app send only plaintext but read as html

    - by bawkstoo
    I get email which seems properly plaintext formatted, but when I forward it out, the font size ends up being enormous and a few other formatting stupidities. So I tried the following: defaults write com.apple.mail PreferPlainText -bool TRUE And this works great, all outgoing email regardless of the text original is plaintext only, just the way I like it. But now for incoming email only the plaintext portions are available to read without going into View - Message - Raw Source (or something similar to that). Does anyone know how I can force only outgoing mail to include only plaintext, but continue to read incoming mail in the formatting it was intended?

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  • Does changing the default HDFS replication factor from 3 affect mapper performance?

    - by liamf
    Have a HDFS/Hadoop cluster setup and am looking into tuning. I wonder if changing the default HDFS replication factor (default:3) to something bigger will improve mapper performance, at the obvious expense of increasing disk storage used? My reasoning being that if the data is already replicated to more nodes, mapper jobs can be run on more nodes in parallel without any data streaming/copying? Anyone got any opinions?

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  • Office for Mac 2011 does not start, how do I repair the database?

    - by RomanT
    After a TimeMachine restore; Office 2011 is having kittens over permissions it would seem. Having attempted a 'repair' out of Disk Utility, am still seeing: there is a problem with the Office database upon startup, after which Word/Excel work without issues. Outlook on the other hand won't even start. Given the obvious message here "You do not have write access to the Outlook application folder" – where is the DB located to check?

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  • Error running Solr

    - by Jon H
    I'm trying to install Apache Solr for Plone, via collective.solr. I've followed the instructions above, and extended my buildout with: [buildout] extends = buildout.cfg https://github.com/Jarn/collective.solr/raw/master/buildout/solr.cfg [instance] eggs += collective.solr bin/buildout runs fine, however, when I try bin/solr-instance fg I get the following error: Traceback (most recent call last): File "bin/solr-instance", line 114, in <module> start(False) File "bin/solr-instance", line 43, in start stdout=logfp, stderr=logfp).pid File "/usr/lib/python2.6/subprocess.py", line 633, in __init__ errread, errwrite) File "/usr/lib/python2.6/subprocess.py", line 1139, in _execute_child raise child_exception OSError: [Errno 2] No such file or directory Graceful stop What am I missing / doing wrong?

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  • Few question on windows explorer properties(win 7)

    - by Nrew
    I've red this article from howtogeek, but it didn't explain this one which is placed in the target portion when you right click on windows explorer and click properties: %windir%\explorer.exe shell:desktop\Inbox And why does local disk E: shows up when I have this one: %windir%\explorer.exe shell:E:\FINAL SAVE DATA I don't really get the code, especially the part in shell: desktop\Inbox. What's that supposed to mean. How do I change it so that when I click on the Windows Explorer shortcut, I get to see this location: E:\FINAL SAVE DATA

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  • Limiting and redirect port access with useragent

    - by linuxcore
    I'm trying to write iptables string match rule To block http://domain.com:8888 and https://domain.com:8888 when it matches the supplied string in the rule. And another rule to redirect the ports also from 8888 to 7777 I tried following rules but unfortunately didn't work iptables -A INPUT -p tcp -s 0.0.0.0/0 -m string --string linuxcore --algo bm --sport 8888 -j DROP iptables -t raw -A PREROUTING -m string --algo bm --string linuxcore -p tcp -i eth0 --dport 8888 -j DROP iptables -t nat -A PREROUTING -p tcp --dport 8888 -m string --algo bm --string "linuxcore" -j REDIRECT --to-port 7777 iptables -A INPUT -t nat -p tcp --dport 8888 -m string --algo bm --string "linuxcore" -j DROP I want to do this from iptables not the webserver because the server may not have a webserver and those ports are working on internal proxy or something like ..etc

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  • Linux - quota per directory?

    - by depesz
    I have following scenarios: Single partition mounted as /, with lots of disk space. There is a range of directories (/pg/tbs1, /pg/tbs2, /pg/tbs3 and so on), and I would like to limit total size of these directories. One option is to make some big files, and then mkfs them, and mount over loopback, and then set quota, but this makes expansion a bit problematic. Is there any other way to make the quota work per directory?

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  • How to create NTFS partition in Linux to install Windows 7 from USB?

    - by Michal Stefanow
    I messed up with my computer and need help. Generally: install Windows 7 from USB. Problem: "setup was unable to create a new system partition" When first attempt to install Windows 7 failed I tried Linux live USB, installed distro to HDD, and erased all the existing partitions. Current state (fdisk -l): [writing from other computer so no copy and paste] /dev/sda1 305GB Linux /dev/sda2 7GB Extended /dev/sda5 7GB Linux Swam / Solaris To create a new, NTFS partition: fdisk /dev/sda n (for new) p (for primary) 3 (for partintion number) "No free sectors available" All the HDD was formatted couple of minutes before so there is a lot of free space but how to resize a parition? I cannot find an option for resizing in man fdisk. Some people say I should use gparted but my distro doesn't not contain this package. And my distro doesn't support wireless drivers so I have serious problems with downloading stuff. I tried also using cfdisk but any command results in: "cfdisk bad primary partition 1 partition ends in the final partial cylinder" I tried also removing partition 1 and then creating a new one (so there is no "no free sectors"). I'm receiving a warning: "Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot." After restating: "grub rescue, no known filesystem" It may indicate that some changes have been made BUT when running Windows 7 installed some another error: "Windows cannot be installed to Disk 0 Partition 1" More detailed: "Windows cannot be installed to this hard disk space. Windows must be installed to a partition formatted as NTFS." So formatting drive using Windows 7 installer BUT this time yet another error: "Setup was unable to create a new system partition or locate an existing system partition. See the setup log files for more information" Apparently I cannot access logs (how?) and I am back to drawing board with my live USB (this time showing partition as HPFS/NTFS). Any suggestions how to install Windows 7? Should I reinstall Linux to HDD, erase existing partitions once again, and use Parted rather than gparted (parted is included in the distro). Or maybe should I create another bootable USB such as PartedMagic to painlessly create partitions? I just want to install Windows 7 from USB, my laptop is semi-operational and I am ready to receive some help regarding fdisk and creating NTFS partitions. UPDATE: I did as suggested (removed all the partitions) and tried to install in unallocated space. Tried to create a new partition and format it. Same error: "setup was unable to create a new system partition" Came to the conclusion it may have something to do with TrueCrypt I have recently installed. Right now trying to FIX MBR (as I haven't got possibility to create rescue disc without optical drive)

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  • Linux software Raid 10 no superblock

    - by Shoshomiga
    I have a software raid 10 with 6 x 2tb hard drives (raid 1 for /boot), ubuntu 10.04 is the os. I had a raid controller failure that put 2 drives out of sync, crashed the system and initially the os didnt boot up and went into initramfs instead, saying that drives were busy but I eventually managed to bring the raid up by stopping and assembling the drives. The os booted up and said that there were filesystem errors, I chose to ignore because it would remount the fs in read-only mode if there was a problem. Everything seemed to be working fine and the 2 drives started to rebuild, I was sure that it was a sata controller failure because I had dma errors in my log files. The os crashed soon after that with ext errors. Now its not bringing up the raid, it says that there is no superblock on /dev/sda2. I tried to reassemble manually with all the device names but it still would not bring up the raid 10 complaining about the missing superblock on sda2, and sda1 was also dropped from the raid 1. When I did examine on the raid10 it says that 1 of the initially failed drives is a spare, the other is spare rebuilding and sda2 is removed. It seems that sda decided to fail right when the system was vulnerable to it because when I boot up a live cd it spews out sda unrecoverable read failures. I have been trying to fix this all week but I'm not sure where to go with this now, I ordered more hard drives because I didn't have a complete backup, but its too late for that now and the only thing I could do is mirror all the hard drives onto the new ones (I'm not sure whether sda was mirrored without errors). On the internet I read that you can recover from this by recreating the array with the same options as when it was made, however because sda is failing I cant use it and I don't want to risk using its mirror instead, so I'm waiting to get another hard drive. I'm also not sure whether to include the out of sync drives or if I can actually use those instead to recover the array. Sorry if this is a mess to read but I've been trying to fix this all day and its late at night now, any thoughts on this would be greatly appreciated. I also did a memtest and changed the motherboard in addition to everything else. EDIT: This is my partition layout Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x0009c34a Device Boot Start End Blocks Id System /dev/sdb1 * 2048 511999 254976 83 Linux /dev/sdb2 512000 3904980991 1952234496 83 Linux /dev/sdb3 3904980992 3907028991 1024000 82 Linux swap / Solaris

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  • How to disable or tune filesystem cache sharing for OpenVZ?

    - by gertvdijk
    For OpenVZ, an example of container-based virtualization, it seems that host and all guests are sharing the filesystem cache. This sounds paradoxical when talking about virtualization, but this is actually a feature of OpenVZ. It makes sense too. Because only one kernel is running, it's possible to benefit from sharing the same pages of filesystem cache in memory. And while it sounds beneficial, I think a set up here actually suffers in performance from it. Here's why I think why: my machines aren't actually sharing any files on disk so I can't benefit from this feature in OpenVZ. Several OpenVZ machines are running MySQL with MyISAM tables. MyISAM relies on the system's filesystem cache for caching of data files, unlike InnoDB's buffer pool. Also some virtual machines are known to do heavy and large I/O operations on the same filesystem in the host. For example, when running cat *.MYD > /dev/null on some large database in one machine, I saw the filesystem cache lowering in another, monitored by htop. This essentially flushes all the useful filesystem cache in guests (FIFO) and so it flushes the MySQL caches in the guests. Now users are complaining that MySQL is very slow. And it is. Some simple SELECT queries take several seconds on times disk I/O is heavily used by other machines. So, simply put: Is there a way to avoid filesystem cache being wiped out by other virtual machines in container-based virtualization? Some thoughts: Choosing algorithm for flushing filesystem cache in the kernel. (possible? how?) Reserving a certain amount of pages for a single VM. (seems no option for filesystem cache type of pages that reading man vzctl) Will running MySQL on another filesystem get me anywhere? If not, I think my alternatives are: Use KVM for MySQL-MyISAM running VMs. KVM actually assigns memory to the VM and does not allow swapping out caches unless using a balloon driver. Move to InnoDB and tune the buffer pools, dirty pages, etc. This is now considered to be 'nice to have' on the long-term as not everyone responsible for administration of the system understands InnoDB. more suggestions welcome. System software: Proxmox (now 1.9, could be upgraded to 2.x). One big LV assigned for the VMs.

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