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• Execute a script with root permission

  - by Bastien974

  Hi all, I need a script that will chown/chmod some files. This script need to be executable by any user. The problem is that those files are owned by different users, so it needs to be executed as root. I tried the SUID so that any users with X permission can execute the script as root, but seems that it doesn't work with a bash script because of security issue. How can I do that ? thanks.

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• Problem with running a script at startup as root?

  - by Usman Ajmal

  Hi The main question: Is there a way I can run 'completely' one of my script when ubuntu's desktop appears no matter if root , administrator, desktop user or an unprivileged user logged in? What does the script do? The script mounts a partition, looks for a file in that partition and finally on the basis of that file a decision of copying a partition to another partition is made. That copying is done via dd if=/dev/sda2 of=/dev/sda5 When does the script run finely? Script runs smoothly when I run it from the terminal by sudo ./my_copying_script This command asks me for the password of currently logged in user. I enter the password and the script starts working. When does the script NOT run finely? I want to run the script at startup. I set it a startup program by using the Startup Applications utility of Ubuntu. Script ran at startup but exited at the dd command returing following error: dd: opening '/dev/sda2': Permission denied On edk's suggestion I set the owner of my_copying_script as root and set the SUID. Now the permissions of my_copying_script are (-rwsr-sr-x). edk's point of view was that once I set the suid, the startup program will run with the permissions of its owner. I did that but the same /dev/sda2 permission denied error came up. I then prefixed the dd with sudo as mentioned below sudo dd if=/dev/sda2 of=/dev/sda5 but this returned following error: sudo: no tty present and no askpass program specified In other words the mounting failed. If I run the script using sudo ./myProgram i don't face this problem and the drive gets mounted successfully.

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• How do I know which /dev/ttyS* is my serial port?

  - by ShaChris23

  I have a laptop which has only one serial port. I went into: /dev directory, and I found: ttyS0 ttyS1 ttyS2 ttyS3 How do I know which of those "ttyS" refers to my serial port?

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• Debian: SSH: "PermitRootLogin=forced-commands-only" stopped working

  - by Brent

  I have several servers running Debian Lenny. Just recently I discovered the PermitRootLogin=forced-commands-only directive for ssh, which allows me to run a scripted rsync as root with an ssl key, without enabling more generalized root ssh access. However, last week this stopped working - it appears on all of my servers - and I can't figure out why. Everything continues to work fine with PermitRootLogin=yes, but I would prefer to block root logins - especially via passwords. The day it stopped working, we reconfigured some of the ports on one of our switches (which we later reverted), but I can't see that affecting this, since it still works with PermitRootLogin set to yes. How can I diagnose why the forced-commands-only directive has apparently stopped working?

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• vim: remove previous code indentation and convert to another

  - by ramgorur

  I have a c project with multiple files (more than 100), the codes are written in Whitesmiths style, but I want to change them into K&R style indentation. Is it possible to do using vim in an automated way ? For example I have a emacs-lisp script to achieve this -- (progn (find-file "{}") (mark-whole-buffer) (setq indent-tabs-mode nil) (untabify (point-min) (point-max)) (indent-region (point-min) (point-max) nil) (save-buffer)) I was wondering if there is a similar trick that could be done with vim.

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• Installing qt headers and libraries

  - by ant2009

  Hello, Ubuntu 9.10 2.6.31-20-generic I am trying to install some software. When I do the ./configure. I get the following error: checking for Qt... configure: error: Qt (>= Qt 3.0.2) (headers and libraries) not found. Please check your installation! So I install the following package thinking this would solve the problem. sudo apt-get install libqt4-dev I was thinking that the libqt4-dev would install the headers and libraries. However, I am still getting the same problem. Any ideas? Many thanks,

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• How can I fix Problems with interlaced video jerking/flicking when playedback on DVD players? (Mixin

  - by Simon P Stevens

  I'm trying to make a DVD and the final DVD jerks when played on standalone DVD players. It seems to play fine on PCs. I think the problem may be to do with interlacing settings when rendering the final output, but I'll outline the whole editing process I have followed in case I've made a mistake somewhere else. Most of the footage comes from a sony handy cam (one of those mini DVD ones) so isn't great quality. It was set to "high quality" (haha) and 16:9 aspect ratio when it was recorded. I copy the files directly from the mini DVDs onto the hard drive and import them into Cinelerra. In Cinelerra I set the format to 25fps, 720x576, RGBA-8bit, 16:9, interlaced bottom fields first. When I've finished the editing, I add a Fields to frames effect (set to bottom first) to each video track. I render to audio and video separately: Audio: AC3, 128kbps Video: YUV4MPEG steam, video pipe settings: ffmpeg -f yuv4mpegpipe -i - -y -target dvd -flags +ilme+ildct mpeg2video % Cinelerra often crashes during the rendering, so I set it to generate a new video file at each label, and combine them using cat when I've got a sucesful render of each one. Once I've combined them, I use mencoder to re-index them: mencoder -forceidx -oac copy -ovc copy merged.m2v -o mergedReIndexed.m2v I combine the audio and video files using ffmpeg: ffmpeg -i AudioFile.ac3 -i VideoFile.m2v -target dvd -flags +ilme+ildct FinalMovie.mpg Then I build the menus with spumux and I create the DVD file system with dvdauthor, and finally I write it do a dvd-r like this: nice -n -20 growisofs -dvd-compat -speed=2 -Z /dev/dvd -dvd-video -V VIDEO ./ && eject /dev/dvd Originally, when I did it the DVD flickered badly, so as suggested in a guide I added the fields to frames effect in cinelerra. Now it doesn't "flicker", but has become "jerky" when there is lots of motion, particularly when the camera is moving, so the whole background moves. This is what I've tried so far: Removed "mpeg2video" from cinelerra video render pipe. Removed +ilme from render pipe. Removed +ildct from render pipe. Removed +ilme from render audio/video rejoin command. Removed +ildct from render audio/video rejoin command. Added -alt to render pipe. Added -alt to render audio/video rejoin command. Tried with and without the frames to fields effect in Cinelerra. and various combinations of the above. I've also tried this: change the Cinelerra fps to 50, use fields to frames (instead of frames to fields), render to an intermediate QTforlinux jpeg video stream, re-importing that back into Cinelerra, adding a frames to fields effect and then rendering that output as normal (@25fps), and I still have the same problem. Has anyone experienced this "jerking" playback before? Can anyone give any suggestions on how to fix it? (Like I say, it plays back fine on a PC, but not on any of the standalone players I've tried)

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• SQUID Transparent SSL proxy (no intercept)

  - by user974896

  I know how to have squid work as a transparent proxy. You put it into transparent mode then use your router or IPTABLES to forward port 80 to the squid port. I would like to do the same for SSL. Every guide I see mentions setting up keys on the squid server. I do not want squid to actually decrypt the SSL traffic then establish a connection with the server, rather I would like squid to simply forward the SSL traffic as is. The only thing I would like to do is be able to check the SSL request for any offending IPs and drop the packets if the destination is one of them.

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• Set custom mount point and mount options for USB stick

  - by kayahr

  Hello, I have an USB stick which contains private stuff like the SSH key. I want to mount this stick to my own home directory with 0700 permissions. Currently I do this with this line in /etc/fstab: LABEL=KAYSTICK /home/k/.kaystick auto rw,user,noauto,umask=077,fmask=177 0 0 This works great but there is one minor problem: In Nautilus (The Gnome file manager) the mount point ".kaystick" is displayed. I guess Nautilus simply scans the /etc/fstab file and displays everything it finds there. This mount point is pretty useless because it can't be clicked when the device is not present and it can't be clicked when the device is present (Because then it is already mounted). I know this is a really minor problem because I could simply ignore it but I'm a perfectionist and so I want to get rid of this useless mount point in Nautilus. Is there another way to customize the mount point and mount options for a specific USB device? Maybe it can be configured in udev? If yes, how?

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• Apache Virtual Hosts behind Cisco Router

  - by Theo

  I'm setting up an Apache 2.2 Ubuntu web server for internal services that is also supposed to be accessed from outside our LAN. Our LAN has a single external IP that is the external IP of our RV042 Cisco router. We have set up several A records on our external DNS server that point to this IP. Our internal DNS server resolve the same records to the internal IP of our web server, so computers from inside the network can access them using the same address as if they were outside. We forwarded the router's external 80 port to our web server's 80 port. I have set up one Virtual Host for each domain name in our list, and my httpd.conf is something like this: ServerName web.domain.com NameVirtualHost *:80 <VirtualHost *:80> ServerName alfresco.domain.com <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPass /alfresco http://localhost:8080/alfresco ProxyPassReverse /alfresco http://localhost:8080/alfresco ProxyPass /share http://localhost:8080/share ProxyPassReverse /share http://localhost:8080/share </VirtualHost> <VirtualHost *:80> ServerName crm.domain.com DocumentRoot /var/www/sugarcrm </VirtualHost> Now, this works if we are in our LAN. However, if we are outside of our LAN we reach our web server's default page saying: It Works! This is the default web page for this server. But we can't reach the virtual hosts, as if the domain name is not being preserved when the router forward the packets to the web server. Am I doing something wrong? How can I check what is going on? What should be the settings to make this work from outside?

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• Preventing - Large Number of Failed Login Attempts from IP

  - by Silver89

  I'm running a CentOS 6.3 server and currently receive emails entitled "Large Number of Failed Login Attempts from IP" from my server every 15 minutes or so. Surely with the below configured it should mean only the person using the (my static ip) should be able to even try and log in? If that's the case where are these remote unknown users trying to log into which is generating these emails? Current Security Steps: root login is only allowed without-password StrictModes yes SSH password login is disabled - PasswordAuthentication no SSH public keys are used SSH port has been changed to a number greater than 40k cPHulk is configured and running Logins limited to specific ip address cPanel and WHM limited to my static ip only hosts.allow sshd: (my static ip) vsftpd: (my static ip) whostmgrd: (my static ip) hosts.deny ALL : ALL

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• Explanation of nodev and nosuid in fstab

  - by Ivan Kovacevic

  I see those two options constantly suggested on the web when someone describes how to mount a tmpfs or ramfs. Often also with noexec but I'm specifically interested in nodev and nosuid. I basically hate just blindly repeating what somebody suggested, without real understanding. And since I only see copy/paste instructions on the net regarding this, I ask here. This is from documentation: nodev - Don't interpret block special devices on the filesystem. nosuid - Block the operation of suid, and sgid bits. But I would like a practical explanation what could happen if I leave those two out. Let's say that I have configured tmpfs or ramfs(without these two mentioned options set) that is accessible(read+write) by a specific (non-root)user on the system. What can that user do to harm the system? Excluding the case of consuming all available system memory in case of ramfs

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• Setting up Web server so it is easy to migrate

  - by Nyxynyx

  Hi I am about to move my site from a VPS to another host's dedicated server. One of my concern is about scaling the site in the future that involves a change of server. Now that I am starting the dedicated server from scratch with only the OS, this means that I need to install the web server stack, including Apache and its mods, PHP, MySQL, PostgreSQL, Tomcat, Solr and a few other softwares like ImageMagick and git. Question: Is there a way for me to setup this new dedicated server such that I can easily migrate the entire site, both the technology stack and the code to the a newer server (upgrade from this new dedicated server) easily without reinstalling and reconfiguring everything? The code for the website is being handled by git and github so thats not a problem. I'm more conerned about the rest of the software required. Side question: The current VPS uses CentOs with cpanel and it seems that many packages are outdated on yum and cpanel interfers with the installation of many packages. Which OS should I go with for the new server? Ubuntu?

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• Cannot chown my own files from NFS

  - by valpa

  We have a NFS server provide home directory for many account, which provided by a NIS server. I have account A and B. In /home/A, I try to copy "cp -a /home/B/somedir ~/". Then I found in /home/A/somedir, all files are owned by user A. Then if I do "chown -R B:B somedir", I got "Operation not permitted" error. I am user A, "cp -a" didn't preserve the original user (B). Then I cannot chown my own files. Any suggestion? I fix my own issue by "chmod 777 /home/A", "su - B" and "cp -a somedir /home/A/", and "su - A", then "chmod 755 /home/A". But it is not a good solution.

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• VLC RTP Streaming in FC12

  - by Matt D

  I'm trying to get VLC to work streaming RTP audio/video over my office network. The goal is multicast a/v streaming. In all test cases, we are streaming from VLC to VLC. I am able to stream from Windows to Windows, and from Fedora to Windows, but not from Windows to Fedora. Additionally, I am unable to receive a LOCAL stream from one instance of VLC to another, within Fedora. I don't see any reason why this would be. The buffer indicator (where the elapsed/total time is normally displayed) never shows any connectivity, so it would appear to be a network problem, but since I am able to stream from Fedora to Windows (same IP, same port) I thought it would be something else. Does anyone know of a solution to this issue?

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• default virtual network interface

  - by Zulakis

  I got a single ethernet connection to a network but need multiple ips. Because of this, I am using virtual network interfaces like this: auto intern iface intern inet static address ... netmask ... gateway ...U auto intern:1 iface intern:1 inet static address ... netmask ... gateway ... I need to specify which IP should be used by default for outgoing traffic. How can I do that?

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• circumstances where software change leads to device damage

  - by nerorevenge

  Recently I changed a friend's OS from a really virus filled windows 7 to Ubuntu ..but kept changing os's because lsusb wouldn't detect the camera.But after coming back to windows, the camera wasn't detected, though I must point out the device driver for the camera was never found. The Sony 'technician' told me that that since the dev-manager of windows 7 couldn't detect the camera , irregardless of whether the device driver was installed, the software change must have damaged the hardware. I was wondering if there is any truth to it.

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• Sendmail: external alias not receiving relayed mail under certain circumstances.

  - by ben

  I have set up an alias in /etc/mail/aliases like this: user: [email protected] This relay DOES work when I telnet to example.com 25 and send mail to [email protected] (where example.com is my domain); it indeed turns up in [email protected] inbox. Also mail sent from my server at example.com is generally deliverable to this same email address, [email protected]. HOWEVER, the relay DOES NOT work when I send mail from [email protected] to [email protected], expecting it to be relayed back to [email protected]. The mail.log shows it being received and sent just fine, so I guess it is being blocked by gmail for some reason. Why though? As I said, gmail generally does except mail from this server.

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• Production Instance : CLOSE_WAIT Connection Issue

  - by rajnikant

  I am using 10EC2 Instances behind 1 ELB. And ELB configured 80 to 8080 and 443 to 8080 port. And all 10EC2 instances having installed with Apache Tomcat, total request on ELB around 8000 to 10000 in 1 minute. I am facing problem for CLOSE_WAIT connection on 10 EC2 Instance, having Apache Tomcat. EC2 Instance Type : m1.xlarge When we restart the Apache Tomcat, all CLOSE_WAIT connections are lost, but its not proper way to work on Production Instances. Please help me out.

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• CHROOT for shell script testing

  - by Josh

  I am looking at setting up a shell script in order to properly document and automate the process I am using to setup a few servers we have. In order to test the shell script through its different stages I was thinking a CHROOT would be ideal, since I can wipe out the "virtual root" and create it on the fly. I have never used CHROOT before, however. I was just curious what are the exact steps I would need to follow to implement this process of creating a chroot (with the basic core functions that would be needed to install apache/php/etc.)? and then destroying it?

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• I don't see the running guest in virsh

  - by Louise Hoffman

  Using CentOS 5 with KVM. I have downloaded this KVM applicance, and when unzipped it is just a .img file. No xml file supplied. I can start the guest with /usr/libexec/qemu-kvm -hda /data/kvm/slash.img -m 512 and it works. Now I would like to make a config file for the guest. The problem is when I do # virsh -c qemu:///system list Id Name State ---------------------------------- # I don't see the guest as expected. Does anyone know what is wrong?

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• Using AWStats, cannot get MaxNbOfExtraX to limit rows in Extra Report

  - by user137519

  Folks, got something really odd here I'd like to resolve. I've been using Awstats and have a couple of extra reports. I cannot get any of them to limit the rows using MaxNbOfExtraX to work. Here are two examples: ExtraSectionName1="Top 100 Searches" ExtraSectionCodeFilter1="200 304" ExtraSectionCondition1="URL,/search/search_post.php" ExtraSectionFirstColumnTitle1="Search Parameters" ExtraSectionFirstColumnValues1="QUERY_STRING,(.*)" ExtraSectionFirstColumnFormat1="QueryParameters: %s" ExtraSectionStatTypes1=HL ExtraSectionAddAverageRow1=0 ExtraSectionAddSumRow1=1 MaxNbOfExtra1=100 MinHitExtra1=4 ExtraSectionName2="Top 100 Downloads" ExtraSectionCodeFilter2="200 304" ExtraSectionCondition2="URL,/filedownload.php" ExtraSectionFirstColumnTitle2="File Downloads" ExtraSectionFirstColumnValues2="QUERY_STRING,(.[0-9]{5})(h|p)?." ExtraSectionFirstColumnFormat2="File ID: %s" ExtraSectionStatTypes2=HL ExtraSectionAddAverageRow2=0 ExtraSectionAddSumRow2=1 MaxNbOfExtra2=100 MinHitExtra2=3 According to all documentation I've read the MaxNbOfExtra1 should keep the limit to 100. However when I run this, with the debug messages enabled I get a message indicated that the query will be in excess of of 500 and would not run it. I increased the number of ExtraTrackedRowsLimit to 2000 and it would work. But the option I provided should have lowered that. I even tried without the ExtraTrackedRowsLimit with MaxNbOfExtra1=100 but same error: No limit to 100 and the "excess of 500" error. I have the URLWithQuery=1 and my reports do run properly along with my regex filters. I am using MinHitExtra1 to limit the rows and that works, but why can I not get the MaxObOfExtraX option to work. Any ideas? Thanks in advance.

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• Send command through PuTTY automatic login

  - by Arthur

  I am using the following to login automatically to a remote server and then run commands listed in a commands.txt, like this: C:\path to\putty.exe -ssh adreese.ip -l user -pw Password -m C:\Path to\command.txt commands.txt contains the following: wakeonlan -i broadcast adress Macadress However, when I try to do so a new window for PuTTY appears, but it closes and exits instantly after login. As a result, I cannot see the output of the command(s). After a several tests, it appears that the command is not execute , cause my computer doesn't "wake on lan". I don't understand what's going on here ? I cannot use the plink.exe program cause I cannot make connection with public key ( too much distant site for doing all the registration keys in putty ) Can someone help me with this ? Or can i use another program to make ssh connection and send command with script from a windows os? Edit : I also try to make a bash file in the distant server with the same command and execute it from the session like this : C:\path to\putty.exe -ssh adreese.ip -l user -pw Password \home\user\script.sh Ihave the same problem... Need help please : /

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• Elastix, how to MOVE files from one server to other server?

  - by yudayyy

  In my office, i have to schedule for moving a file from one computer to other computer (Both are using Elastix). My idea is using cron, scp, and rm to do this. So here are the script that i use: scp -r /home/data/* [email protected]:/home/data1 && rm -r /home/data/* That script did the copy, but not remove the source file. I already read this question: Hov to _MOVE_ files with scp? The problem is, the computer doesn't have an internet connection. So i cannot install rsync on my elastix computer. yum install rsync Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile and then it freezes. Any idea how to do this?

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• Setting umask for all users

  - by Yarin

  I'm trying to set the default umask to 002 for all users including root on my CentOS box. According to this and other answers, this can be achieved by editing /etc/profile. However the comments at the top of that file say: It's NOT a good idea to change this file unless you know what you are doing. It's much better to create a custom.sh shell script in /etc/profile.d/ to make custom changes to your environment, as this will prevent the need for merging in future updates. So I went ahead and created the following file: /etc/profile.d/myapp.sh with the single line: umask 002 Now, when I create a file logged in as root, the file is born with 664 permissions, the way I had hoped. But files created by my Apache wsgi application, or files created with sudo, still default to 644 permissions... $ touch newfile (as root): Result = 664 (Works) $ sudo touch newfile: Result = 644 (Doesn't work) Files created by Apache wsgi app: Result = 644 (Doesn't work) Files created by Python's RotatingFileHandler: Result = 644 (Doesn't work) Why is this happening, and how can I ensure 664 file permissions system wide, no matter what creates the file? UPDATE: I ended up finding a cleaner solution to this on a per-directory basis using ACLs, which I describe here.

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