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  • Looking for a file-system overlay using LD_PRELOAD

    - by ki.lya.online.fr
    Hi, I'm looking for a shared library that is to be loaded using LD_PRELOAD that would modify the view of the filesystem to the client program. Ideally, I'd like to choose the filesystem root (or use / as root) and to overlay the filesystem by renaming filenames. For example, I might want to tell my program to look for /usr/lib/* in /usr/lib32/* instead. Do you know of such a program ? Thanks.

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  • ls, rm, cd commands not working in SUSE LINUX

    - by Jak
    Hi All, Iam newbi to SUSE, I installed java in my SUSE linux Server edition, So i want to set the path in linux,So i created .bash_profile in in /root path using touch and added the path as "JAVA_PATH". When restart my linux the above command is not working and it show unknown command "JAVA_PATH", I can't able to boot in GUI mode, I can boot only in terminal mode, How to delete the file (.bash_profile in /root) ? And how to add java path in SUSE Note: Before all the commands are working fine Thanks in Advance, Jak...

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  • How to poll the username, when having the UID?

    - by JMW
    we're using ldap with sssd for the usermanagement, so our users are not in the "/etc/passwd" Unfortunately, ps just shows the UIDs: [root@xyz ~]# id jmw uid=1582(jmw) gid=1582(jmw) groups=1582(jmw), 1000(admins) [root@xyz ~]# ps aux [..cutting some output..] 1582 26794 25.0 0.4 190420 38508 ? S 12:15 0:00 /usr/bin/php-cgi -c php.ini [..cutting some output..] How can i poll the username, that belongs to a UID? ( a grep ':1582:' /etc/passwd doesn't work ;-) )

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  • Why does writing a file to an NFS share send a COMMIT operation to the NFS server?

    - by Antonis Christofides
    I have a Debian squeeze (2.6.32-5-amd64) which is at the same time a NFS4 server and client (it mounts itself through NFS4). The local directory that leads directly to disk is /nfs4exports/mydir, whereas /nfs4mounts/mydir is the same thing mounted through NFS, using the machine's external IP address. Here is the line from fstab: 192.168.1.75:/mydir /nfs4mounts/mydir nfs4 soft 0 0 I have an application that writes many small files. If I write directly to /nfs4exports/mydir, it writes thousands of files per second; but if I write to /nfs4mounts/mydir, it writes 4 files per second or so. I can greatly increase speed if I add async to /etc/exports. (Writing a single large file to the NFS-mounted directory goes at more than 100 MB/s.) I examine the server statistics and I see that whenever a file is written, it is "committed" (this also happens with NFSv3): root@debianvboxtest:~# mount -t nfs4 192.168.1.75:/mydir /mnt root@debianvboxtest:~# nfsstat|grep -A 2 'nfs v4 operations' Server nfs v4 operations: op0-unused op1-unused op2-future access close commit 0 0% 0 0% 0 0% 10 4% 1 0% 1 0% root@debianvboxtest:~# echo 'hello' >/mnt/test1056 root@debianvboxtest:~# nfsstat|grep -A 2 'nfs v4 operations' Server nfs v4 operations: op0-unused op1-unused op2-future access close commit 0 0% 0 0% 0 0% 11 4% 2 0% 2 0% Now in the RFC, I read this: The COMMIT operation is similar in operation and semantics to the POSIX fsync(2) system call that synchronizes a file's state with the disk (file data and metadata is flushed to disk or stable storage). COMMIT performs the same operation for a client, flushing any unsynchronized data and metadata on the server to the server's disk or stable storage for the specified file. I don't understand why the client commits. I don't think that the "echo" shell built-in command runs fsync; if echo wrote to a local file and then the machine went down, the file might be lost. In contrast, the NFS client appears to be sending a COMMIT upon completion of the echo. Why? I am reluctant to use the async NFS server option, because it would apparently ignore COMMIT. I feel as if I had a local filesystem and I had to choose between syncing every file upon close and ignoring fsync altogether. What have I understood wrong?

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  • What is the most secure way to allow a user read access to a log file?

    - by gAMBOOKa
    My application requires read access to /var/log/messages, which belongs to user and group root. What is the minimal exposure level required on /var/log/messages so my application can read it? Presently, my plan is to change the group ownership of /var/log/messages to a new group, and add root and my application user to it, but this would also give the application write privileges to /var/log/messages. OS: Centos 5.5

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  • Openbox fails on login

    - by Sam
    X throws this error: Xsession: unable to launch "/usr/share/xsessions/openbox.xsession" Xsession --- "/usr/share/xsessions/openbox.xsession" not found; Falling back to default session. But a trip to the Command line reveals: sam@Aristotle:/usr/share/xsessions$ ls ... -rw-r--r-- 1 root root 164 2011-05-22 12:27 openbox.xsession ... I am using Ubuntu 12.04, openbox 3.5.0, and X.Org X Server 1.10.4

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  • Wirelss card not being detected in backtrack 5

    - by Jesse Nelson
    I just installed backtrack 5 and I am unable to detect my wireless card. iwconfig doesn't list my interface. I can see that the hardware is present in lspci -vnn (see below) but I can't get the interface detected. I have tried to reinstall the compat-wireless package but I get errors during the build (see below) I have done a ton of researching and I keep hitting a brick wall, mostly because the wiki for backtrack is down and I can't find any good resources. Does anyone know how to fix the issue? Also, does anyone no how I can scan the hardware to determine what NIC is assigning my interface? If I can figure out the interface name I think I can set it up manually by putting up the link and using wireless-tools to manually configure the connection, this is what I had to do in arch on my mac. As stated the wiki for backtrack is down and I can't find any help on the issue. I tried to do the full kernel upgrade suggested in my software update but after the update was complete and I logged back in I had a new log in manager and the only thing I was able to log into was window managers. However, after this update my wireless was working fine. Please help I am new to Linux and the wiki is down, I have nowhere else to turn. Forgot to mention I am using the KDE version, not Gnome. Thanks in advance for any help or support. Attempt at make: root@bt:/usr/src/compat-wireless-3.3-rc1-2# make /usr/src/compat-wireless-3.3-rc1-2/config.mk:254: "WARNING: CONFIG_CFG80211_WEXT will be deactivated or not working because kernel was compiled with CONFIG_WIRELESS_EXT=n. Tools using wext interface like iwconfig will not work. To activate it build your kernel e.g. with CONFIG_LIBIPW=m." make -C /lib/modules/2.6.38/build M=/usr/src/compat-wireless-3.3-rc1-2 modules make: *** /lib/modules/2.6.38/build: No such file or directory. Stop. make: *** [modules] Error 2 lspci output: root@bt:/usr/src/compat-wireless-3.3-rc1-2# lspci -vnn -i net lspci: I/O error at net, line 0 root@bt:/usr/src/compat-wireless-3.3-rc1-2# lspci -vnn 02:00.0 Network controller [0280]: Atheros Communications Inc. Device [168c:0032] (rev ff) (prog-if ff) !!! Unknown header type 7f ( This is the problem but I can't find the solution) Kernel modules: ath9k iwconfig output: root@bt:/usr/src/compat-wireless-3.3-rc1-2# iwconfig lo no wireless extensions. eth0 no wireless extensions.

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  • permission errors with python/django

    - by tipu
    Error can be seen here: http://djaffry.selfip.com:8080/ If i go to the folder /srv/twingle/search and do ls -l I get -rwxrwxrwx 1 root root 65142784 May 26 20:28 words.db I gave it 777 access (absolutely unsafe, I know, but I thought it would atleast work) any idea what can be the permissions problem? Edit: A very strange problem is that the code doesn't crash once every few refreshes.. then goes back to crashing

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  • Failed to start up after upgrading software in ubuntu 10.10

    - by Landy
    I've been running Ubuntu 10.10 in a physical x86-64 machine. Today Update Manager reminded me that there are some updates to install and I confirmed the action. I should had read the update list but I didn't. I can only remember there is an update about cups. After the upgrading, Update Manager requires a restart and I confirmed too. But after the restart, the computer can't start up. There are errors in the console. Begin: Running /scripts/init-premount ... done. Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done. [xxx]usb 1-8: new high speed USB device using ehci_hcd and address 3 [xxx]usb 2-1: new full speed USB device using ohci_hcd and address 2 [xxx]hub 2-1:1.0: USB hub found [xxx]hub 2-1:1.0: 4 ports detected [xxx]usb 2-1.1: new low speed USB device using ohci_hcd and address 3 Gave up waiting for root device. Common probles: - Boot args (cat /proc/cmdline) - Check rootdelay=(did the system wait long enough) - Check root= (did the system wait for the right device?) - Missing modules (cat /proc/modules; ls /dev) FATAL: Could not load /lib/modules/2.6.35-22-generic/modules.dep: No such file or directory FATAL: Could not load /lib/modules/2.6.35-22-generic/modules.dep: No such file or directory ALERT! /dev/sda1 does not exist. Dropping to a shell! BusyBox v1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell(ash) Enter 'help' for a list of built-in commands. (initramfs)[cursor is here] At the moment, I can't input anything in the console. The keyboard doesn't work at all. What's wrong? How can I check boot args or "root=" as suggested? How can I fix this issue? Thanks. =============== PS1: the /dev/sda1 is type ext4 (rw,nosuid,nodev) PS2: the /dev/sda1 can be mounted and accessed successfully under SUSE 11 SP1 x64.

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  • Open application with lowered privileges

    - by GP89
    I have a mac installer which runs as root with pre and post install bash scripts. At the end of the post install script I launch the application which inherits and opens as root. Is there a way I can lower the permissions back down to the user that ran the installer and then open the app? Or a more hackish way I can set the app to open in some scheduler from the script, which then gets opened by the scheduler which would have the users permissions

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  • 'Can't convert nil into String' error upon Puppet run

    - by Adrian
    When attempting to use modules copied into the Puppet modules directory, my puppet client returns ' Could not retrieve catalog from remote server: Error 400 on SERVER: can't convert nil in String' errors when connecting to the Puppet master server. [root@puppetmaster modules]# rpm -qa *puppet* puppet-2.7.18-1.el6.noarch puppet-server-2.7.18-1.el6.noarch [root@puppetmaster modules]# uname -sr Linux 2.6.32-279.el6.x86_64 Code all checks out and is valid. SELinux is turned on.

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  • ec2 LAMP REDhat distro change mysql password error

    - by t q
    i am on ec2 plain linux and wish to change my mySQL password ive tried: sudo mysqladmin -u root -p '***old***' password '***new****' then it prompts me to enter password then i enter ***old*** but i keep getting an error message mysqladmin: connect to server at 'localhost' failed error: 'Access denied for user 'root'@'localhost' (using password: YES)' question: how do i change my current password?

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  • OpenVPN useradd error

    - by zfz
    I tried to install an OpenVPN access server in Centos 6 on a linode VPS. The installation error occours when adding the user "openvpn". However, the installation is okay for my ubuntu 11.10 distro in another VPS. The error message is "useradd: canot open /etc/passwd" The detail of My "/etc/passwd" file: "-rw-r--r-- 1 root root 1194 Oct 9 00:33 /etc/passwd" So how can I add the user "openvpn" to setup the VPN service? Thanks.

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  • weird SSH connection timed out

    - by bran
    This problem started when I tried to login to my brand spaning new VPS server. I remember that in my first SSH try on the server I actually got prompt for password several times which would mean that there is no port blocking problem from my isp. Since the password did'nt work for me (for some reason). I had a lot of authentication failure. After that attempting to log in to the server just timed out. I did the same at mediatemple (which used to work before with sftp) and put in wrong password and now trying to ssh (or even SFTP) gives me timeout error. So some kind of security feature is preventing me from trying too many times to log in, either from my side or from the server side. Any idea what it could be? TRaceroute and ping works on the ips. I am using a zyxel wimax modem (max-206m1r - if that's relevent) c:\Program Files (x86)\OpenSSH\bin>ssh.exe [email protected] ssh: connect to host 109.169.7.136 port 22: Connection timed out c:\Program Files (x86)\OpenSSH\bin>ssh.exe [email protected] ssh: connect to host 109.169.7.131 port 22: Connection timed out c:\Program Files (x86)\OpenSSH\bin>ssh.exe [email protected] ssh: connect to host 87.117.249.227 port 22: Connection timed out c:\Program Files (x86)\OpenSSH\bin>ssh.exe [email protected] -vv OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug2: ssh_connect: needpriv 0 debug1: Connecting to 87.117.249.227 [87.117.249.227] port 22. debug1: connect to address 87.117.249.227 port 22: Connection timed out ssh: connect to host 87.117.249.227 port 22: Connection timed out c:\Program Files (x86)\OpenSSH\bin>ssh.exe s122797.gridserver.com Could not create directory '/home/pavs/.ssh'. The authenticity of host 's122797.gridserver.com (205.186.175.110)' can't be est ablished. RSA key fingerprint is 33:24:1e:38:bc:fd:75:02:81:d8:39:42:16:f6:f6:ff. Are you sure you want to continue connecting (yes/no)? yes Failed to add the host to the list of known hosts (/home/pavs/.ssh/known_hosts). Password: Password: Password: [email protected]'s password: Permission denied, please try again. [email protected]'s password: Permission denied, please try again. [email protected]'s password: Received disconnect from 205.186.175.110: 2: Too many authentication failures fo r pavs c:\Program Files (x86)\OpenSSH\bin>ssh.exe s122797.gridserver.com ssh: connect to host s122797.gridserver.com port 22: Connection timed out c:\Program Files (x86)\OpenSSH\bin>ssh.exe s122797.gridserver.com ssh: connect to host s122797.gridserver.com port 22: Connection timed out

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  • Track kids browsing history even when they know how to clear it manually

    - by Darren Newton
    I have a colleague with two teenage boys (yes, cue cliche's about 'I have this friend see...') He's currently having issues with them browsing pr0n and wants to do a little spying on their browsing (I'm staying clear of the philosophies/ethics on this.) The kids are savvy enough to clear their browsing history when they're done. As I'm his goto for IT he has asked me if there is a way to keep a hold of the browsing history. The family uses Macs, and the kids surf with Safari. I know that browsing history is kept here ~/Library/Safari/History.plist. I figure there should be a way to write either an AppleScript or other script (Python/Ruby/Bash) that can backup this file to a different location (/opt/local/history, etc.) Since the kids know to clear their history when they're done should the file be periodically backed up with something similar to a cron job or something like Hazel? While that could work it seems like it would create a ton of little incremental backups. Or is it possible to 'watch' ~/Library/Safari/History.plist and incrementally add changes to a backup file (saving a diff so to speak) but not lose any data? Any ideas/solutions appreciated. UPDATE/EDIT: Got the word from concerned dad that the oldest uses Firefox on a different PC, so the OpenDNS solution (preferably at the router level) is the best answer so far as it would capture usage for the whole house.

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  • Can I get vim to correctly indent this Ruby code (Nokogiri)?

    - by Nathan Long
    The first XML Builder Example for Nokogiri looks like this: builder = Nokogiri::XML::Builder.new do |xml| xml.root { xml.products { xml.widget { xml.id_ "10" xml.name "Awesome widget" } } } end puts builder.to_xml Even though I have the Ruby Vim files installed, Vim's autoindent flattens the above example like this: builder = Nokogiri::XML::Builder.new do |xml| xml.root { xml.products { xml.widget { xml.id_ "10" xml.name "Awesome widget" } } } end puts builder.to_xml Does anybody know how to get Vim to autoindent this correctly?

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  • `adduser [options] user group` fails ubuntu 11.04

    - by Rob
    I'm want to use adduser However it doesn't seem to work if I provide the second argument for the user's group root@a:~# adduser rick staff adduser: The user `rick' does not exist. The group exists root@a:~# addgroup staff addgroup: The group `staff' already exists. The man page says this should work... adduser [options] user group Any ideas? I can do: adduser --ingroup staff rick So no massive issue, just seems strange.

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  • How to start Cygwin's NFS server in read-write mode?

    - by Vi
    Installed Cyginw NFS server. It works. But I can't make it allow writing to the filesystem. Why does it fail? Server: $ cat /etc/exports #/ 10.99.98.2(rw,no_root_squash) /cygdrive/c/foranevia *(rw,no_squash_root,anon_uid=0,anon_gid=0,no_subtree_check) Client: root@vi-notebook:/mnt# mount wpc:/cygdrive/c/foranevia nfs root@vi-notebook:/mnt# mkdir nfs/qqq mkdir: cannot create directory `nfs/qqq': Read-only file system

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  • tc rules block traffic from some hosts at network

    - by user139430
    I have a problem I can not solve. The script, which sets the rules for traffic shaping is blocking the traffic from some hosts.If I remove all the rules, then it works. I can not understand why? Here is my script... #!/bin/sh cmdTC=/sbin/tc rateLANDl="60mbit" ceilLANDl="60mbit" rateLANUl="40mbit" ceilLANUl="40mbit" quantLAN="1514" # Nowaday bandwidth limit set to 100mbit. # We devide it with 60mbit download and 40mbit upload bandthes. rateHiDl="30mbit" ceilHiDl="60mbit" rateHiUl="20mbit" ceilHiUl="40mbit" quantHi="1514" rateLoDl="30mbit" ceilLoDl="60mbit" rateLoUl="20mbit" ceilLoUl="40mbit" quantLo="1514" devNIF=eth0 devFIF=ifb0 modprobe ifb ip link set $devFIF up 2>/dev/null #exit 0 ################################################################################################ # Remove discuiplines from network and fake interfaces ################################################################################################ $cmdTC qdisc del dev $devNIF root 2>/dev/null $cmdTC qdisc del dev $devFIF root 2>/dev/null $cmdTC qdisc del dev $devNIF ingress 2>/dev/null if [ "$1" = "down" ]; then exit 0 fi ################################################################################################ # Create discuiplines for network interface ################################################################################################ $cmdTC qdisc add dev $devNIF root handle 1:0 htb default 12 # Create classes for network interface $cmdTC class add dev $devNIF parent 1:0 classid 1:1 htb rate ${rateLANDl} ceil ${ceilLANDl} quantum ${quantLAN} $cmdTC class add dev $devNIF parent 1:1 classid 1:11 htb rate ${rateHiDl} ceil ${ceilHiDl} quantum ${quantHi} $cmdTC class add dev $devNIF parent 1:1 classid 1:12 htb rate ${rateLoDl} ceil ${ceilLoDl} quantum ${quantLo} $cmdTC qdisc add dev $devNIF parent 1:11 handle 111: sfq perturb 10 $cmdTC qdisc add dev $devNIF parent 1:12 handle 112: sfq perturb 10 # Create filters for network interface $cmdTC filter add dev $devNIF protocol all parent 1:0 u32 match ip dst 10.252.2.0/24 flowid 1:11 $cmdTC filter add dev $devNIF protocol all parent 111: handle 111 flow hash keys dst divisor 1024 baseclass 1:11 $cmdTC filter add dev $devNIF protocol all parent 112: handle 112 flow hash keys dst divisor 1024 baseclass 1:12 ################################################################################################ # Create discuiplines for fake interface ################################################################################################ $cmdTC qdisc add dev $devFIF root handle 1:0 htb default 12 # Create classes for network interface $cmdTC class add dev $devFIF parent 1:0 classid 1:1 htb rate ${rateLANUl} ceil ${ceilLANUl} quantum ${quantLAN} $cmdTC class add dev $devFIF parent 1:1 classid 1:11 htb rate ${rateHiUl} ceil ${ceilHiUl} quantum ${quantHi} $cmdTC class add dev $devFIF parent 1:1 classid 1:12 htb rate ${rateLoUl} ceil ${ceilLoUl} quantum ${quantLo} $cmdTC qdisc add dev $devFIF parent 1:11 handle 111: sfq perturb 10 $cmdTC qdisc add dev $devFIF parent 1:12 handle 112: sfq perturb 10 # Create filters for network interface $cmdTC filter add dev $devFIF protocol all parent 1:0 u32 match ip src 10.252.2.0/24 flowid 1:11 $cmdTC filter add dev $devFIF protocol all parent 111: handle 111 flow hash keys src divisor 1024 baseclass 1:11 $cmdTC filter add dev $devFIF protocol all parent 112: handle 112 flow hash keys src divisor 1024 baseclass 1:12 ################################################################################################ # Create redirect discuiplines from network to fake interface ################################################################################################ $cmdTC qdisc add dev $devNIF handle ffff:0 ingress $cmdTC filter add dev $devNIF parent ffff:0 protocol all u32 match u32 0 0 action mirred egress redirect dev $devFIF Here is my /etc/modules: loop ifb ppp_mppe nf_conntrack_pptp nt_conntrack_proto_gre nf_nat_pptp nf_nat_proto_gre The system is Linux wall 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux

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  • How to publish a page to two sites?

    - by George2
    Hello everyone, I am using SharePoint 2007 Enterprise + Publishing portal template + Windows Server 2008. I have a root site and a sub-site. I want to enable the following function -- when the sub-site administrator publishing a page, the administrator could select to publish to the sub-site only or publish to both root site and sub-site. Any ideas how to implement this? I am not sure whether there is any ready-to-use solution without writing code? thanks in advance, George

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  • Spanning-Tree and redundant links

    - by Franko
    I have 2 switches which have redundancy between them, meaning fa0/1 on SW1 is connected to fa0/1 on SW2, and fa0/2 on SW1 is connected to fa0/2 on SW2. Both of the switches have the same BID, however the MAC address of SW1 is numerically lower, hence making it the root bridge. Now my question is, on SW2, what determines which of fa0/1 and fa0/2 becomes the RP (Root Port) and the other on blocking state?

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  • Enabling Shell colours through Putty SSH

    - by Jon
    I have set a number of configurations in my .bashrc file to set the appearance of shell on my Redhat machine. However, when I login as root using Putty, the colours are not shown. I can enable them again by typing 'su', which simply puts me back to root like I was when I logged into putty, but that isn't exaclty ideal. Is there some configuration file or something I can use to enable shell colours when I login with Putty? Thanks

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  • Is there a faster way to change default apps associated with file types on OS X?

    - by Lri
    Is there anything more convenient than using RCDefaultApp or Magic Launch, or just repeatedly pressing the Change All buttons in Finder's information panels? I thought about writing a shell script that would modify the CFBundleDocumentTypes arrays in Info.plist files. But each app has multiple keys (sometimes an icon) that would need to be changed. lsregister can't be used to make specific modifications to the Launch Services database. $ `locate lsregister` -h lsregister: [OPTIONS] [ <path>... ] [ -apps <domain>[,domain]... ] [ -libs <domain>[,domain]... ] [ -all <domain>[,domain]... ] Paths are searched for applications to register with the Launch Service database. Valid domains are "system", "local", "network" and "user". Domains can also be specified using only the first letter. -kill Reset the Launch Services database before doing anything else -seed If database isn't seeded, scan default locations for applications and libraries to register -lint Print information about plist errors while registering bundles -convert Register apps found in older LS database files -lazy n Sleep for n seconds before registering/scanning -r Recursive directory scan, do not recurse into packages or invisible directories -R Recursive directory scan, descending into packages and invisible directories -f force-update registration even if mod date is unchanged -u unregister instead of register -v Display progress information -dump Display full database contents after registration -h Display this help

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