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• dhclient.conf: Send 2x host-names to the DHCP server?

  - by RobM

  Already working: Debian box DHCP with send host-name me.company.com in dhclient.conf DNS updates automatically with an entry for me.company.com What I want to add: Send a second host-name, so both are automatically registered with DNS In other words: I want a DHCP client to register with DNS twice using different names, preferably without having to maintain DNS records manually. Is this even possible with DHCP?

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• How much ram to be able to convert large (5-6MB) jpegs? [closed]

  - by cosmicbdog

  I've got a project where we want to be processing large jpegs (5-6MB) with apache and php (using GD library). My understanding is that the server converts the image into a BMP making it quite ram heavy and currently we're unable to do it with our 1gb of memory. Here's the error we get: Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 17408 bytes) How much ram should we be looking at running with to process images of this size? Edit: As Chris S the purist highlighted below, my post is apparently vague. I am doing the most basic and common manipulation of an image, say turning it from a 4352px x 3264px jpg of 5mb in size, to a 900px x 675px file.

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• How to securely control access to a backend key server?

  - by andy

  I need to securely encrypt data in my database so that if the database is dumped, hackers are unable to decrypt the data. I'm planning on creating a simple key server on a different machine, and allowing the DB server access to it (restricted by IP address on the key server to permit the DB server). The key server would contain the key required to encrypt/decrypt data. However, if a hacker were able to get a shell on the DB server, they could request the key from the key server and therefore decrypt the data in the database. How could I prevent this (assuming all firewalls are in place, DB is not connected directly to the internet, etc)? i.e. is there some method I could use that could secure a request from the DB server to the key server so that even if a hacker had a shell on the DB server they'd be unable to make those same requests? Signed requests from the DB server could make issuing these requests less trivial - I suppose that'd help increase the amount of time it'd take to compromise the key server, something a hacker probably wouldn't have much of. As far as I can see, if someone can get a shell on the DB server everything's lost anyway. This could be mitigated by using one key per data item in the DB so at least there's not a single "master" key, but multiple keys that the hacker would need to access. What would be a secure method of ensuring requests from the DB server to the key server were authentic and could be trusted?

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• List installed packages with the repo they came from?

  - by Sandra

  With rpm it is possible to list installed packages with additional info rpm -qa --queryformat "%-35{NAME} %-35{DISTRIBUTION} %{VERSION}-%{RELEASE}\n" | sort -k 1,2 -t " " -i which will produce something like xorg-x11-drv-ur98 (none) 1.1.0-1.1 xorg-x11-drv-vesa CentOS-5 1.3.0-8.3.el5 xorg-x11-drv-vga (none) 4.1.0-2.1 xorg-x11-drv-via (none) 0.2.1-9 On Ubnutu server would I like to list all installed packages and show from which repository in came from. Can that be done?

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• Bridging two wireless interfaces with brctl?

  - by AK_

  I have this topology: [internet] ^ L-------[wlan0]-[host]-[wlan1]-----[client-1] I tried to bridge wlan0 wlan1 but it wont work with brctl; but magically when I issue this command #iw set dev wlan0 4addr on it adds wlan0 to the bridge BUT I lost all internet connection and I was unable to hook it to the internet router. can somebody please explain why did that happen and is there a way to get this done ?

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• How do I tell which kernel module is servicing a /dev device?

  - by regulatre

  How do I find out which kernel module (as seen by typing lsmod) is servicing a particular device in /dev ? In other words, say I have a device, /dev/mouse0 and I want to find out which kernel module is installed to service that device. How do I do that? Another way to look at this is, some loaded kernel modules associate themselves with a device in /dev. How does one find out which device(s) a module is "attached" to?

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• Avoid putty ssh terminal to crash when disconnecting from server

  - by JBoy

  I'm connecting via ssh to a remote 'live' server where i have some bash scripts automated via the crontab, when an error happens in some of the automation scripts within the server, the connection to the server is killed, this is fine to me, but the problem is that Putty closes the entire window, which is a behavior i don't want. I have checked all around the web, unfortunately the putty site does not have a support page, but nothing. Under putty's option i have tried all the menus expanding all options, but still i cant find the right one, i would expect it to be under Windowbehaviour Do you have an advice? Thx

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• ruby on rails server is intermittently slow

  - by Richard

  My rails installation was chugging along nicely. Last night we had to perform a hot-patch with was really a standard deploy of some exception code. Once capistrano finished the operation one of our admins discovered that there were two long running passenger processes. While we have deployed release over the past two weeks it would appear that these processes have been here and alive the whole time. Granted they could have been zombies or any other artifact and at this point we do not know what state they were in. Which leads me to the question: There are so many moving parts between the rails application and the OS/hardware that being a SME is probably no longer possible. So; how does a sysadmin perform root-cause analysis with any certainty? And: When do I just start rebooting servers?

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• Backing up to smaller drive

  - by Dave

  In a few hours I'll have a new 500GB Sony laptop, filled with the usual Sony rubbish which I'll promptly be replacing with Ubuntu or Crunchbang or something. However, first I want to make a full clone of the drive (including recovery partitions), should I wish to return it to Sony or sell it on in its factory state. The problem is that the only backup drives I have are less than 500GB - the biggest I have is 250GB or so! So I need to backup and compress on-the-fly. What's the best way to do this? Presumably dd piped into gzip would do the trick, or does anyone have any other suggestions to accomplish this?

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• Provide credentials to process in a safe manner

  - by Erik Aigner

  On system startup I need to launch a process which requires credentials for other services (database etc.) to interact. I obviously don't want to store those on disk for security reasons. I'm trying to think of a way to provide those credentials to the process on launch - and on launch only. After that they should be only available to the process. Is this possible somehow? The bottom line is to make it as hard as possible for an intruder to get to those credentials.

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• PcLinuxOs demands I use only one repository at time. Is it right?

  - by m33600

  I come to your presence with this question that is paralyzing my coding efforts. PclinuxOs was my distro of choice for reliability, but it is jealous and does not permit me to add repos from, say, Debian. The wiki is clear advising on using just one repo, and I end up not finding what I used to find on normal Debians. Multimon, the audio decoder, for example (my other question) is not there. When I try to install multimon with hammer and plies, it returns errors of all kinds. Is there a way to safely and temporarily add a repository, make the install and remove the repo, returning pclinuxos to its stable state?

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• I tried installing Ubuntu 10.04 and I got this message - any ideas on what to do?

  - by user41926

  No root file system defined. Please correct this from the partition menu. This message shows up when I first boot into Ubuntu after the installation. I installed it by mounting the ISO with Daemon Tools, and I just did the default Wubi installation. I keep reading everywhere that I need to choose my installation directory, but I don't get any option to do that. These are all the options I get for installation directory. I have a C and D partition on my drive, and I tried installing it on both and no luck either way. Any ideas?

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• redirect output from dd command

  - by laks

  How to redirect output from dd command to /dev/null ?

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• USB webcam just works once and next time I've to reboot

  - by user30262

  I'm using Ubuntu 9.10, and a usb webcam that is shown as 'Bus 001 Device 005: ID 0ac8:3450 Z-Star Microelectronics Corp.' by lsusb. The problem is that on connecting the cam, it just works with the first program I start (skype, tokbox, messenger), and if I disconnect it or switch to another program, it stops to work and I have to restart my computer to make it work again. Has anyone else noticed this behaviour? Is there some good solution to reset the camera without rebooting to make it work again?

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• I wrote a new X11 keyboard layout file, how do I get my system to recognize it?

  - by grimborg

  I like to configure my keys my way, so I wrote a keyboard symbols file and I put it in /usr/share/X11/xkb/symbols/cat I use it by running setxkbmap cat -variant dvorak (and it works), but it doesn't show up in the console configuration (dpkg-reconfigure console-setup) nor in the Gnome keyboard settings... nor anywhere else, so I have to run setxkbmap every time. I suppose that I have to register it somewhere, but where? Any hints? Thanks!

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• Subversion Permission Denied when adding or committing

  - by Rungano

  Hi guys I am running subversion 1.4 on Centos 5.2 and my clients are using tortoise to do their check out, commit etc. I think I have permissions problems but I have configured the folder to accessible to everyone with 777 attribute but I seem not to be getting anywhere. Its generating this error on tortoise "svn: Can't open file 'PATH/TO/MY/FILES/entries': Permission denied". Some guy was suggesting some indexing software installed on the client machine like google desktop, any suggestions?

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• Example value for a nautilus (file manager) connect to service custom location.

  - by C.W.Holeman II

  I am looking for an example for a nautilus (fie manager) connect to service custom location. $ nautilus Activate connection editor: File>Connect To Server...> I am looking for an example or two for "Location" in the pop up: Service Type: [Custom Location] Location: [???] [x] Add bookmark Bookmark name: [xyz] <Connect>

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• What's the most compact way to store a password-protected RSA key?

  - by Tim

  I've tried converting a PEM-encoded key to DER format, and it appears the password is stripped regardless of the -passout argument. Example: openssl rsa -in tmp.pem -outform DER -out tmp.der -passin pass:foo -passout pass:bar -des3 The resulting key appears no longer password-protected, so I am assuming that DER format does not support a password - is that correct? What alternative way is there to store this in a compact, binary form, and keep the password-protection?

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• FTP permissions problem

  - by John Isaacks

  I have vsftpd installed on ubuntu. I added a new created a new user and set the users home path to /var/www so I can ftp with that user directly to that location. And that all works, I can now FTP with the user I created directly to that location. However I whenever I ftp, I have no permissions to change anything. How can I change that? Thanks!!

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• Video Player/Library for Ubuntu with ratings and thumbs

  - by greggannicott

  Hi. I've just made the switch to Ubuntu on my main PC and I've been looking for a media player that can: Play all the usual video formats Rate (and ideally, tag) each file Display thumbnails for each file Other than that there isn't much I'm after. Banshee comes close, but doesn't display thumbnails. I've Google'd lots but I'm running out of search terms to try. Does anyone have any suggestions? Cheers!

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• What prevents an attack on Postfix through its named pipes?

  - by Met?Ed

  What prevents an attack on Postfix through its named pipes by writing bogus data to them? I see on my system that they permit write access to other. I wonder if that opens Postfix to DoS or some other form of attack. prw--w--w- 1 postfix postdrop 0 Nov 28 21:13 /var/spool/postfix/public/pickup prw--w--w- 1 postfix postdrop 0 Nov 28 21:13 /var/spool/postfix/public/qmgr I reviewed the pickup(8) man page, and searched here and elsewhere, but failed to turn up any answers.

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• Use puppet to make changes to ip route and sysctl

  - by Quintin Par

  I have two changes to ip route & sysctl that disable tcp slow start. Here’s how I do it ip route show Make a note of the line starting with default. Pick up the IP from the default line and run sudo ip route change default via $ip_address dev eth0 initcwnd 12 sudo sysctl -w net.ipv4.tcp_slow_start_after_idle=0 How can I create a puppet script out of this? One that can be deployed to many machines of the same type – CentOS 6 Edit: Added bounty to get a working example for sudo ip route change default via $ip_address dev eth0 initcwnd 12

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• migration of physical server to a virtual solution, what i have to do?

  - by bibarse

  Hello I'm new in this forum, so i would like that you forgive me for my blissfully and my low English level. I'm a trainee in company one month ago, and my mission is to migrate 3 physicals servers to a virtualization technology. The company edit softwares for E-learning so there are lots of data like videos, flash and compressed (zip). This is some inventory of the servers: OS: Debian, 2 redhat, apache, php/mysql, sendMail/Dovecot, webmin with virtualmin template to create dynamically the web sites because there is no sysadmin ... The future provider will be responsible of to secure, update and create the virtual machines (outsourcing) and with a RedHat OS's. So i want that you help me to choose a virtualisation technologie (for the i prefer KVM of Redhat RHEV, VMWare is expensive), how evaluate the hardware needs (this for evolution of 4 or 5 years) and to elaborate a good planing to don't forget any think. Thank you for your responses.

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• ssh -x : howto get clipboard?

  - by Gupu User

  Hello! I'm connected to a server via ssh -x and my only way to get text out of the system is the x clipboard (unless i want to take thousends of screenshots and OCR over it). I can not execute any programs on the other machine, because i don't have access. How can I achive this?

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• Transparent, unicode X terminal not tied to a Desktop Environment?

  - by jamuraa

  I've been looking for this for a while now and I just haven't been able to find one. The last few that I used were: aterm - this one was fast and had good transparency support, but it doesn't support Unicode at all as far as I can tell. The dependency graph is also reasonable. gnome-terminal - was good, and had good transparency support plus unicode, but it pulls in about everything in gnome, and I don't use anything else in gnome. It was also somewhat slow (noticable lag in updating at times) and wouldn't use fonts that I wanted. Eterm - same thing as aterm, good dependencies and transparency but no unicode. Does anyone have suggestions, or will I be stuck with gnome-terminal's dependencies and slowness?

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