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• How to add exception for backup MX to tumgreyspf?

  - by Waleed Hamra

  I have an Ubuntu raring server running postfix/dovecot as an email server, with tumgreyspf doing greylisting and SPF checks. My problem is that I also have a backup MX server, that is supposed to store my emails temporarily, should my main server ever fails. It usually rejects receiving emails if it finds the main server online and functional. The problem is when it does need to do its job, tumgreyspf rejects all emails from the backup MX with an error like this: Jun 27 16:18:13 hamra postfix/smtpd[28732]: NOQUEUE: reject: RCPT from mxbackup.mydomain.com[x.x.x.x]: 550 5.7.1 <[email protected]>: Recipient address rejected: QUEUE_ID="" SPF Reports: 'SPF fail - not authorized'; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<mxbackup.mydomain.com> any ideas?

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• What is the name of this screw? (from HP ProLiant quick-deploy rail kits)

  - by kockiren

  I need the name of the screw for the HP quick deploy rail kit. The screw clicks into the square holes of the rack. It is a Gen4 Rail kit but the screw is like the Gen8 Rail kit ones. I called HP support, but they couldn't really help me. Unfortunately the rack manual does not name this screw either. After googling a while, I found the compatible "Thumb Style Rack Screws". It would do the job but isn't exactly what I am looking for. So, what is the name of the pictured screw.

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• How to make sure rsync sets proper file permissions?

  - by BetaRide

  I'm transfering data from a synology box to a debian box with rsync. Unfortunately the permissions of all transfered files are set to rwxrwxrwx on the debian box. I want to make sure this files can be seen by the owning user only. Is there a way to tell the debian box to set the permissions to something like rwx------? The rsync job is set-up through the DSM GUI. If possible I'd rather avoid hacking the synology box and do something on the command line. This means I'm looking for a way to set the permissions on the server side (debian box). I'm using the latest DSM version (4.1).

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• OpenSSH SFTP: chrooted user with access to other chrooted users' files

  - by HannesFostie

  Decided to re-phrase the question entirely in order to not have to make a new one. I currently have an SFTP server set up using OpenSSH's SFTP functionality. All my users are chrooted, and everything works. What I need most right now is for one user, which is not root (because this user can't have any real SSH powers!), to have access to all other users' chrooted dirs. This user's job is to fetch all uploaded documents every once in a while. Directory structure as of now is: /home |_ /home/user1 |_ /home/user2 |_ /home/user3 With ChrootDirectory set as /home/%u User "adminuser" should have access to user1, user2 and user3's directories without having access to /home or at the very least not to anything but /home. Bonus points for the one who can tell me how to let users write inside /home/%u without having to make a new directory inside that dir which they own themselves, and not root as is the case with /home/%u (openssh chroot prerequisite).

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• Converting a .bat executable to Mac

  - by Wes

  I need some help converting a .bat executable file that I run on our PC at my job so that it works on a mac. Before we upload tar files to our website we run this script which to the best of my knowledge simply unlocks all of the permissions to the tar and all the images within. If someone could help me in "translating" it to run on my Mac that would be awesome! I was hoping I could set up something in Automator Here's the code del images5.tar move images4.tar images5.tar move images3.tar images4.tar move images2.tar images3.tar move images.tar images2.tar cd .. tar --mode=777 -rvf images.tar *.jpg tar --mode=777 -rvf images.tar p move images.tar ./tarpics

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• Installing Image Magick on Amazon EC2

  - by Kapil Sharma

  Well I'm a PHP developer who know few linux commands to get my job done. I need to launch a symfony 1.4 website on Amazon EC2. Everything is fine except IMagick. I magick is also installed through following command: sudo yum install ImageMagick Its php lib is not installed/configured, if that do not happen with above command. In PHP, I'm using IMagick, but script is failing on IMagick. I know problem is with PHP IMagic extention but dont know how to fix that. On dev box, its as simple as turning it on on WAMP. Can someone please suggest where should I look to confirm if IMagick PHP extention installed and configured correctly?

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• Network adapters reliability

  - by casey_miller

  Can you help me with understanding of reliability of network adapters. Most of the time servers do have at least 2 NIC's bonded to provide sort of a HA for it. So in case of one NIC fails, the second would still do the job. I wonder which factors work when you use network adapters. I know that, the most important and weakest part of any computer system is: storage (i.e HDD). but how reliable actually network adapters are? There are more expensive ones, and cheaper adapters. In which cases do they actually fail? In what circumstances. May it be a intensive usage of them Time when it's on In your experience how often you found yourself changing NIC's due to their fail? Or just what's the typical lifetime of commodity NIC's? thanks.

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• How to backup data on debian vps to dropbox?

  - by IBr

  I have really simple private VPS with some webpages and music server. I want to backup some configs and some scripts to dropbox or similar service. Server has no gui (except simple ssh X forwarding, which is neither convenient for constant usage and does not provide full desktop) everything is controlled through ssh. So my question would is it possible to setup dropbox client for command line use? How? Is there any alternatives for dropbox, which would have command line clients? Also is it possible to incorporate backup into script for cron job?

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• Optimum number of threads while multitasking

  - by Gun Deniz

  I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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• btrfs won't run from cron

  - by Mikkel

  I'm trying to set up a cron job to create a btrfs subvolume snapshot of my root partition. The command works perfectly if I run it from the command line, but nothing happens at the scheduled cron time. I've tried piping to logger and redirecting stdout/stderr to file, and not only is there no content, the file I'm logging to isn't even created. The cron command I have is as follows: 0 0 * * * /sbin/btrfs subvolume snapshot / "/snapshots/$(date +%Y-%m-%d)" I've tried prefixing it with /bin/bash, but that makes no difference. What am I missing?

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• Thoughts on Apache log file sizes?

  - by Nathan Long

  Do you place any limits on the size of Apache log files - access.log and error.log? Specifically, can you give: Reasons to limit log file sizes Disk space Any other? Reasons NOT to limit log file sizes Research into performance issues or security breaches Any other? Methods of doing so Cron job that periodically deletes the file, or the first N lines? Any other? Anything you might salvage before deleting For example, grep out how many times a file was downloaded before deleting the access logs I'd like get the thoughts of experienced sysadmins before I do anything. (Marking as community wiki since this may be a matter of opinion.)

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• Clear / Flush cached memory

  - by TheDave

  I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: sync; echo 3 > /proc/sys/vm/drop_caches I read it could be useful to add this to a chron-task/job. Is this method recommended or could this lead to potential problems? The only concern I have is that I use one Magento installation on Memcached - could this have any negative effects on it? I am certainly not a pro therefore I would very much appreciate some expert advise. PS: My VPS runs on CentOS 5 x64 and I have WHM + NGINX installed.

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• Check IMAP via PHP for mesages in order to interact with them via PHP?

  - by Roger

  I use Google to administer my e-mails and I run Nginx + PHP. If I want to check incoming mail to interact with each message subject (to trigger an action), as far as I know, I have only two options: 1) access Google via IMAP PHP / cron job or 2) forward the messages to my server where I can have a subdomain set to pipe the messages to a PHP script. Frankly, I'd preffer the first option because I have already all the IMAP functions tested and done. And if the second solution is really the best, I'd preffer to use Postfix. However, id like some light grom somebody who has already browsed this unknown waters. Thank you.

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• OS X clients ignoring Windows print server permissions

  - by Ilumiari

  I'm in the process of testing a Windows Server 2008 R2 print server for a mixed OS X/Windows environment. Any security permissions (AD groups) I set for the printers on the print server are not honoured by the OS X clients. Only if I remove absolutely all permissions for a given printer will an OS X client not print to that printer. The Windows clients honour the permissions as expected. The PrintService log doesn't record any activity when an unprivileged Windows client attempts to print, and records a typical print job when an unprivileged OS X client attempts to print. Has anyone encountered this problem before and have a fix? With 600-700 clients, a number of which are dual-booting, restricting by IP address is not viable. EDIT: The jobs are definitely going through the print server, they show up in the logs with their AD credentials.

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• Web Folder size/quota reporting tool?

  - by nctrnl

  I am currently using a Visual Basic script to determine how big the web folders are and what quota is decided for each folder. The quota is in no way a physical limit, just a value inserted by me to decide whether a user is using too much space or not. The script does the job quite neatly and sends an html file by mail on a regular basis. The problem is that it's such a hassle to insert new quotas since I have to fiddle around with the code. A central "control panel" with an overview and ability to insert new quotas would be more suitable. Is there any software that can do the following: Scan specified folder/subfolders Report the file size and present it in some sort of interface (could be a php/mysql solution) Ability to specify a quota and see the difference value ? It is really important that the quota handling is made simple so that some non-technician can handle this.

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• Web Folder size/quota reporting tool?

  - by nctrnl

  I am currently using a Visual Basic script to determine how big the web folders are and what quota is decided for each folder. The quota is in no way a physical limit, just a value inserted by me to decide whether a user is using too much space or not. The script does the job quite neatly and sends an html file by mail on a regular basis. The problem is that it's such a hassle to insert new quotas since I have to fiddle around with the code. A central "control panel" with an overview and ability to insert new quotas would be more suitable. Is there any software that can do the following: Scan specified folder/subfolders Report the file size and present it in some sort of interface (could be a php/mysql solution) Ability to specify a quota and see the difference value ? It is really important that the quota handling is made simple so that some non-technician can handle this.

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• Stop Munin messages from /var/log/syslog

  - by Sparsh Gupta

  Hello I am using munin on a system which is adding a log entry in syslog everytime the munin-node cron job executes. It is not an issue but it sometimes makes other errors spotting difficult. There are entries like Feb 28 07:05:01 li235-57 CRON[2634]: (root) CMD (if [ -x /etc/munin/plugins/apt_all ]; then /etc/munin/plugins/apt_all update 7200 12 >/dev/null; elif [ -x /etc/munin/plugins/apt ]; then /etc/munin/plugins/apt update 7200 12 >/dev/null; fi) every 5 minutes and I was wondering how can I stop the messages going into syslog. For munin specific errors I anyways have to keep an eye on /var/log/munin/* Thanks Sparsh

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• Sendmail.mc: alias all incoming e-mails to one account

  - by Angus

  I need to alias all mail coming from another SMTP server to this one account "myinbox". The system in question is to receive all e-mail on the domain, if that's any help. http://william.shallum.net/random-notes/sendmailredirectallmailfordevelopment is a template for the beginning of a solution, but that routes everything (including outgoing and internal mail) to that one account, and trying to understand how these R rules work is making my head spin. I think the answer is in sendmail.mc rather than any Procmail configuration. So I think what I generally don't want the filter to do is: Interfere w/any outgoing e-mail Interfere w/any internal e-mail Sometimes some cron job causes "root" to mail to "root". I don't want these to go to myinbox. Cause infinite loops Who does? Bounce messages and any DSNs come to mind. I'm running Sendmail 8.13.1 and Procmail 3.22.

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• Download folders from dev server to local drive

  - by Niall Collins

  I am developing a .net web application on a local environment. I have a dev server that the application is installed on. Within the web application on the dev server I have four folders that I dont have locally and that are controlled by another application. In my day to day development I require the four folders on local PC. I would like to automate the process of pulling the folders from the dev server to my local drive, so I can keep thing in sync. Ideally something like this Run file from main folder (be it a bat file, powershell, some sort of job, open to recommendations) Download 4 folders supplied to it. First download bring everything down, from them on only pull the changes Not sure where to start with achieving this but would appreciate any help would with. I know there are apps out there that do something like this but would like to give a go writing something to do this before I resort to using one of them.

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• ubuntu pptp connections from command line

  - by Ian R

  I'm using a lot of vpn connections daily for my work and I want to program a pptp dialer in python to ease my job a little bit by automating things. I usually go with network-manager-pptp to setup my connections but I would like to skip this gui tool and do it from the script. Something like a dialer. My question is. Can pptp connections be established using the command tools only? Also, where does network-manager-pptp saves its failes so I can take a look and see what configs it generates. Any help is much appreciated.

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• How to swap ctrl and fn key on a MacBook Pro running Windows 7 via Boot Camp?

  - by hobbes3

  There are sooooo many discussion on the internet about swapping the fn and ctrl key on a MacBook Pro. On the Mac side, a new software called ReMap4MacBook does a perfect job swapping the two key. But on the PC side (specifically Windows 7), I can't really find a definitive answer. Most post refer to this article but I read the loooong article and followed the instructions to no avail. I remember there used to be a program (maybe it was on XP) that not only swapped the two keys but it also controlled the fans on the MacBook Pro. But I can't remember the name and I also recall that that program stopped being updated like years ago. EDIT: It's called Input Remapper. So I am hoping there exist a simple program that I can simply run to swap those two keys.

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• Will disabling NAT on my wireless router cause a performance hit on my DSL router?

  - by user117313

  I have a Thomson TG508v2 router/modem and a brand new AirPort Extreme connected to it. At first, I set the AirPort Extreme to "share a public IP", which enables DHCP/NAT. Everything works great but I was having the Double NAT error. So I set the AirPort Extreme as bridge mode, which disables DHCP/NAT and let my crappy modem handle my internal network IPs. Will this cause any performance hit in my network? I'm worried because I'll outsource this job from AirPort Extreme (premium hardware) to the crappy modem. Before you suggest, I tried setting my modem as a bridge and configuring PPPoE on the AirPort Extreme, however it wouldn't connect to the internet, so I just dismissed leaving the modem as bridge.

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• Disk quota problem in Windows Server SBS 2003

  - by deddebme

  I have got a new job and the existing SBS 2003 domain setup is unsecure (i.e. everyone is a domain admin etc etc). There are lots of problem due to inexperienced "network admin", and I am trying to fix them one by one. There exist one issue which I found quite weird, that the "Quota" tab exists in the C:(NTFS) drive but not the D:(NTFS) drive. I played around with gpedit to enable disk quota (it was "not configured" before), but still I can't see that tab. Have you seen this problem before? How did you solve it?

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• How to rename everything matching a certain string in a folder

  - by lostiniceland

  Hello Everyone I am running Linux and I have some basic console knowledge but my current problem is quite difficult and I dont know how to achieve this. I want/need to rename everything within a folder that matches a given string. By everything I mean folders/files content within a file content in hidden files Basically I want to refactor a Java-project. Sure, I could use Eclipse to handle the replacing, but this leaves out the folders or resources outside of my workspace. I was thinking of a script that could do the job for me but this seems rather tricky. For instance when it comes to folder-/file-rename I want to replace only the part of the name that matches my string, the rest should remain untouched. Maybe someone already has something like this in his/her script-collection :-) Thanks in advance Marc

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• WGet or cURL: Mirror Site from http://site.com And No Internal Access

  - by alharaka

  I have tried wget -m wget -r and a whole bunch of variations. I am getting some of the images on http://site.com, one of the scripts, and none of the CSS, even with the fscking -p parameter. The only HTML page is index.html and there are several more referenced, so I am at a loss. curlmirror.pl on the cURL developers website does not seem to get the job done either. Is there something I am missing? I have tried different levels of recursion with only this URL, but I get the feeling I am missing something. Long story short, some school allows its students to submit web projects, but they want to know how they can collect everything for the instructor who will grade it, instead of him going to all the externally hsoted sites.

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