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  • Linux 3.12 disponible en version stable, avec des gains de performances et une réduction de la consommation d'énergie

    Linux 3.12 disponible en version stable avec des gains de performances et une réduction de la consommation d'énergieLinux Torvalds a annoncé via un message sur LKLM (Linux Kernel Mailing List) la sortie de la version stable du noyau Linux 3.12.Au menu des améliorations, un changement dans la façon de gérer la fréquence de fonctionnement du processeur de l'ordinateur (modification de l'algorithme CPUfreq governor) permettant des gains significatifs de performances et une réduction de la consommation...

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  • How do I configure a swap partition using swapspace

    - by jcalfee314
    I finally have the swapspace project installed and running (via init.d). The purpose is to have a dynamically re-sizing swap partition. I'm clueless however on how to use it. It has good documentation but just does not go into that last step. How to I configure a swap partition using swapspace? The process is probably the same for any 3rd party program that would provide a swap space implementation to the kernel. I know this was intended to run as a process because the project provides an init.d script.

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  • iptables rule for forwarding outbound traffic

    - by Claudiu
    I am trying to forward the outbound traffic to another server. Current rule is: /sbin/iptables -A OUTPUT -p tcp -s localhost -o 91.xxx.xxx.xxx --dport 65000:65010 -j ACCEPT but when I do a iptables -L, the rule its showed like this: ACCEPT tcp -- localhost.localdomain anywhere tcp dpts:65000:65010 So I guess my rule is bad written since the "destination" column shows "anywhere" Can you help me with this?

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  • How to back up initial state of external backup drive?

    - by intuited
    I've picked up an HP Simplesave external drive. It comes with some fancy software that is of no use to me because I don't use Windows. Like many current consumer-targeted backup drives, the backup software is actually contained on the drive itself. I'd like to save the drive's initial state so that I can restore it if I decide to sell it. The backup box itself is somewhat customized: in addition to the hard drive device, it presents a CDROM-like device on /dev/sr0. I gather that the purpose of this cdrom device is to bootstrap via Windows autoplay the backup application which lives on the disk itself. I wouldn't suppose any guarantees about how it does this, so it seems important to preserve the exact state of the disk. The drive is formatted with a single 500GB NTFS partition. My initial thought was to use dd to dump the disk (/dev/sdb) itself, but this proved impractical, as the resulting file was not sparse. This seemed to be because the NTFS empty space is not filled with zeroes, but with a repeating series of 16 bytes. I tried gzipping the output of dd. This reduced to the file to a manageable size — the first 18GB was compressed to 81MB, versus 47MB to tarball the contents of the mounted filesystem — but it was very slow on my admittedly somewhat derelict Pentium M processor. The time to do that first 18GB was about 30 minutes. So I've resorted to dumping the disk state and partition data separately. I've dumped the partition state with sfdisk -d /dev/sdb > sfdisk.-d.out I've also created a compressed image of the NTFS partition (the only one on the disk) with ntfsclone --save-image --output - /dev/sdb1 | gzip -c > ntfsclone.img.gz Is there anything else I should do to ensure that I can restore the precise original state of the drive?

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  • What is the meaning of the 'Personalities' feature under /proc/mdstat

    - by drcelus
    On some systems I see this : Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty] md1 : active raid1 sdb1[1] sda1[0] 10485696 blocks [2/2] [UU] md2 : active raid1 sdb2[1] sda2[0] 477371328 blocks [2/2] [UU] And other systems show : Personalities : [raid1] md0 : active raid1 sdb2[1] sda2[0] 204788 blocks super 1.0 [2/2] [UU] md1 : active raid1 sdb1[1] sda1[0] 4193272 blocks super 1.1 [2/2] [UU] md2 : active raid1 sda3[0] sdb3[1] 483985276 blocks super 1.1 [2/2] [UU] bitmap: 0/4 pages [0KB], 65536KB chunk I wonder what is the meaning of Personalities and the impact of having different values.

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  • ACL permissions not behaving as expected

    - by Yarin
    I set the following ACL on my web directory: setfacl -R -d -m mask:002 /var/www and then created a file as root that I expected to be readable by the default (apache) group. -rw--w-r--+ 1 root apache 0 Dec 17 22:32 newfile.py When I run getfacl on the file, I get: # file: newfile.py # owner: root # group: apache user::rw- group::rwx #effective:-w- mask::-w- other::r-- I'm not sure how to read this- but all I know is that the webserver is throwing a permissions error because apache can't read the file. Can anyone explain what is going on here?

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  • Checkpoint - Routing into the tunnel

    - by Fake4d
    I have a simple question for my checkpoint infrastructure. Do i have to route a net which i wanna access over a configured firewall VPN Tunnel. Explanation: I have two firewalls connected over a VPN which have several nets behind them. I need to access a new net at the other firewall and put them in their encryption Domain. Now here is the question: Do i have to route it in the operating system (SecurePlat)? Thanks!

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  • Can I use Cygwin as a replacement for Ubuntu, for bash script testing?

    - by Jeroen De Meerleer
    Next wednesday i'm having an exam on Operating Systems. In this exam there will also be a part bash-scripting. The teacher itself will test the scripts in a Virtual Machine running Ubuntu. Myself, however, I'm having serious troubles with running the latest Ubuntu (14.04 LTS) on a Virtual Machine (there are troubles with gnome running very slow). So I'm thinking about using Cygwin, which is doing the job great for another course. The teacher already confirmed I can use that, but I'm thinking he doesn't know it at all. I've already tested the scripts we made in class and they're all running without errors. But I'm quite sure there are some things I have to mind on. My question: would you use Cygwin as a replacement for the Ubuntu VM? Or should I stick it with the VM (maybe by using a different config/platform).

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  • How to stop LDAP authentication in ubuntu?

    - by Kery
    My OS is Ubuntu 12.04 and use LDAP authentication. Now I meet a problem that another people want to access my system. But he is in another domain so he can't login. And I have no right to change this configuration in LDAP server. So I have to choose a workaround to solve this problem, for example close the LDAP authentication and use local authentication (I have root right in my system) or create another account which is not registered in LDAP server (I did this but can't change the created account password. The error is 'password reset by root is not supported'). Of course any other suggestion is appreciated! Than you in advance!

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  • How expensive is a hostname in htaccess? Other solutions possible?

    - by Nanne
    For easy allow or disallowing of dynamic IP-adresses you can add them as a hostname in a .htaccess file. As I have read from: .htaccess allow from hostname? it does a reverse lookup on the connecting ip address, seeing if the response matches the allowed name. (Well, actually Apache is doing a double lookup, first a reverse lookup and then a forward lookup on the result of the reverse.) This is the reason we are currently not using dynamic-ip hostnames in the .htaccess: this "sounds" quite heavy: 2 extra lookups for every request. Is this indeed quite heavy, and would a reasonably busy server that is rather looking for less then more load get away with this :)? (e.g.: how does this 'load' compare to the rest? If a request is 1000 times more expensive then the lookups it might be negligible. otoh, it could be that final straw :) ) Are there other solutions? I can write a script that does a lookup of the hostname and put it in .htaccess files ofcourse, but this feels a bit like a hack.

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  • blocking port 80 via iptables

    - by JoyIan Yee-Hernandez
    I'm having problems with iptables. I am trying to block port 80 from the outside, basically plan is we just need to Tunnel via SSH then we can get on the GUI etc. on a server I have this in my rule: Chain OUTPUT (policy ACCEPT 28145 packets, 14M bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * eth1 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED And Chain INPUT (policy DROP 41 packets, 6041 bytes) 0 0 DROP tcp -- eth1 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED Any guys wanna share some insights?

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  • File command output is different for same file on diff machine

    - by Coka
    I get different output of file command on same file(checked inode) from different machines. One of the machines is with suse10 sp3 and the another - rhel4. machine1>file x.tcl x.tcl: ASCII English text machin2>file x.tcl x.tcl: data Even in vi editor same file look different from different machine. Any clue? One more thing - there's third machine suse10 sp3 works fine. Is this machine issue?

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  • Wireless performance on Ubuntu 9.10

    - by Brian
    Is there something I should do to my networking configuration in Ubuntu to better the performance of my wireless connection? I'm on a netbook dual-booting Windows 7 and Ubuntu 9.10. I pick up much stronger wifi signal when in Windows than Ubuntu. As soon as I boot Ubuntu, it will connect to the network with a stronger signal, and then loses signal very quickly. After it dies, I can't reconnect. I've tested this on a couple of different networks with the same outcome.

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  • sudoer scheme to allow useful access to another web developer yet retain future control of a virtual

    - by Tchalvak
    Background: Virtual Private Server I have a virtual private server that I'm looking to host multiple websites on, and provide access to another web developer. I don't care about putting too many constraints on him, though I wouldn't mind isolating the site that he'll be developing from other sites on the server that I will develop. The problem: retain control Mainly what I want is to make sure that I retain control over the server in the future. I want to reserve the ability to create/promote/demote and other administrative functions that don't deal with web software. If I make him an admin, he can sudo su - and become root and remove root control from me, for example. I need him not to be able to: take away other admin permissions change the root password have control over other security/administrative functions I would like him to still be able to: install software (through apt-get) restart apache access mysql configure mysql/apache reboot edit web development configuration type files in /etc/ Other Standard Setups would be happily considered I've never really set up a good sudoers file, so simple example setups would be very useful, even if they're only somewhat similar to the settings that I'm hoping for above. Edit: I have not yet finalized permissions, so standard, useful sudo setups are certainly an option, the lists above are more what I'm hoping I can do, I don't know that that setup can be done. I'm sure that people have solved this type of problem before somehow, though, and I'd like to go with something somewhat tested as opposed to something I've homegrown.

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  • What's the reason to break HDD to few partitions for MDADM+LVM2?

    - by archer
    I'm using 2 HDDs each 1TB in size. I'm going to create MDADM+LVM2 over them. Initially I though about this partition layout: /dev/sda1 - 1Gb (boot) /dev/sda2 - 500Gb (md0) /dev/sda3 - 499Gb (md1) /dev/sdb1 - 1Gb (boot) /dev/sdb2 - 500Gb (md0) /dev/sdb3 - 499Gb (md1) md0 is going to be raid0 and md1 is going to be raid1 however, I found some info that this would be better to break each drive to more partitions (lets say 10 partitions 100Gb in size each). What's the reason of doing that?

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  • Tool to run same key strokes on multiple unix machines

    - by virtualvoid
    I want to run the same commands on multiple machines, I know I can do this using ssh scripting or things like clusterssh, however I don't want to install anything on the server. (Don't have the rights) What I want is to just clone the keystrokes across multiple machines e.g. run cat /etc/oratab on one window and same is run on multiple windows e.g. in putty, is there a tool to do that from a windows client.

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  • cannot find java even though it is there (ubuntu 12.04)

    - by Jeff Storey
    I'm trying to just execute the java command and it's saying it cannot be found, even though it is there. Here's what my output looks like root@oneiric:/usr/lib/jvm/default-java/bin# ls -al java -rwxrwxrwx 1 uucp 143 5750 2012-09-20 11:14 java root@oneiric:/usr/lib/jvm/default-java/bin# ./java -su: ./java: No such file or directory So the ls shows it's there, but it doesn't seem to execute. Can someone explain why this is?

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  • Fedora 19 no longer bootable

    - by Parisa
    I had fedora dual-booted with windows on my laptop for a while but with windows refresh grub was gone and my system directly booted windows. I booted fedora with my systems boot options and with this tutorial: https://fedoraproject.org/wiki/GRUB_2 I reinstalled grub2 but then had my system booted into an empty grub prompt: grub So I found the drive containing vmlinuz and initramfs (completely sure about thair location and versions) and tried to manually boot it but after the boot command it said: no suitable video mode found booting in blind mode and nothing happened. Such a tragedy... I have already tried to use live disks rescue system. Funny but troubleshooting options don't apear on my laptop while they do on my desktop pc. I cant even go to boot prompt on my lenovo idepad z400 laptop. I also tried EasyBCD so maybe I could boot it with windows but it comes up with this error: missing AutoNeoGrub().mbr Now I have removed the grub prompt (don't know why) and its really hard for me to reinstall my dearly customized fedora. If anyone knows a way to help boot it again or reinstall it keeping my files and installations I really need it. Thanks PS:I have already tried Boot-repair Disk but it asks me to enable the repo containing grub-efi on my fedora to reinstall the grub2 and fix the boot for me (how could i?).

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  • Is disabling password login for SSH the same as deleting the password for all users?

    - by Arsham Skrenes
    I have a cloud server with only a root user. I SSH to it using RSA keys only. To make it more secure, I wanted to disable the password feature. I know that this can be done by editing the /etc/ssh/sshd_config file and changing PermitRootLogin yes to PermitRootLogin without-password. I was wondering if simply deleting the root password via passwd -d root would be the equivalent (assuming I do not create more users or new users have their passwords deleted too). Are there any security issues with one approach verses the other?

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  • push commits to git (gitolite) repository messes up file permissions (no more trac access)

    - by klemens
    already posted here so feel free to answer there. everytime i commit/push something to the git server the file permissions change (all added/edited files in the repository have no read and execute access for the group). thus trac can't access the repository. do I need to change permissions of the folder differently? chmod u=rwx,g=rx,o= -R /home/git/repositories or do i need to setup gitolite somehow to write files with different permissions??? regards, klemens

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  • SDcard /dev/sdb2 is apparently in use by the system; will not make a filesystem here

    - by user171223
    I divided my sdcard into 2 partitions, but It got an error and couldn't create a new partition. Error: /dev/sdb2 is apparently in use by the system; will not make a filesystem here! My /dev/sdb was not mounted, and the output of command lsblk was: cxphong@cxphong:~/Desktop$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 1024M 0 rom sda 8:0 0 465.8G 0 disk +-sda1 8:1 0 118.8G 0 part +-sda2 8:2 0 147.7G 0 part /media/DATA +-sda3 8:3 0 137.1G 0 part +-sda4 8:4 0 1K 0 part +-sda5 8:5 0 1023M 0 part [SWAP] +-sda6 8:6 0 61.2G 0 part / sdb 8:16 1 3.7G 0 disk +-sdb1 8:17 1 70.6M 0 part +-sdb2 8:18 1 3.6G 0 part +-sdb1 (dm-0) 252:0 0 70.6M 0 part +-sdb2 (dm-1) 252:1 0 3.6G 0 part I couldn't delete /dev/sdb1 (dm-0) & /dev/sdb2 (dm-1). What are they?

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  • XFS: No space left on device

    - by beketa
    I am using XFS on small HDD (/dev/sdb1, less than 1TB) and storing many small files (-32KB). df -h and -i show that it has available space. # df -hv Filesystem Size Used Avail Use% Mounted on /dev/sda3 127G 19G 102G 16% / tmpfs 16G 0 16G 0% /lib/init/rw udev 16G 168K 16G 1% /dev tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 99M 20M 75M 21% /boot /dev/sdb1 136G 123G 14G 91% /mnt/sdb1 # df -iv Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda3 8421376 36199 8385177 1% / tmpfs 4126158 5 4126153 1% /lib/init/rw udev 4124934 671 4124263 1% /dev tmpfs 4126158 1 4126157 1% /dev/shm /dev/sda1 26112 222 25890 1% /boot /dev/sdb1 24905120 11076608 13828512 45% /mnt/sdb1 However I got No space left on device error. # touch /mnt/sdb1/test touch: cannot touch `/mnt/sdb1/test': No space left on device I think inode64 issue is not related to this case because drive is less than 1TB and df -i shows that there are free inodes. I unmounted and mounted with -o inode64 but got the same error. xfs_repair does not report any problem. xfs_info shows drive information as follows. # xfs_info /dev/sdb1 meta-data=/dev/sdb1 isize=1024 agcount=16, agsize=2227764 blks = sectsz=512 attr=2 data = bsize=4096 blocks=35644210, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal bsize=4096 blocks=17404, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 Any ideas? Thanks!

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  • Puppet: is it ok to "force" certname when you expect to shuffle nodes around?

    - by Luke404
    We all know (good example on SF) that Puppet hostname detection could be... fun. At our company (and I guess we're not alone at this) we usually pre-configure servers at our offices and test them before bringing the gear to a remote datacenter and rack them. Of course the reverse dns will change when doing that, even if we don't change the actual hostname of the system. We're slowly drafting our puppet setup and I'd like to be sure those moves won't create problems. My idea is to explicitly configure the desired full FQDN of the system as certname in puppet.conf at server provision time (before the very first puppet run). My process would look something like this: basic o.s. installation basic network configuration, enough to reach the internet and resolve dns install puppet and set up certname start puppet and let him manage the whole configuration test, fix problems in config (via puppet), re-test, and so on... manually stop puppet set up new network configuration for the datacenter network move the machine to DC turn it on puppet should automatically start and keep on doing its job The process is supported by detecting the environment in puppet's manifests (eg. based on subnet, like they do at Wikimedia) and modify configuration as needed (eg. resolv.conf contents appropriate for each network). Each node's certname will never change for the whole system life cycle. Is there any problem with this approach? Could it be improved?

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  • Url rewrite rule

    - by vvr
    How to redirect a page form show.php?id=(15charstring) to show/(15charstring) I tried like this it is doing reverse means it is redirecting /show/(15chars) to show.php?id=(15chars) RewriteEngine on RewriteRule ^/show/([a-zA-Z0-9]{15})$ http://site.com/show.php?id=$1 Second case is i have to redirect to another page if he added &m=true to the url show.php?id=(15chars)&m=true html/show.php?id=(15chars).

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