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• How to mount LUKS partition securely on server

  - by Ency

  I'm curious if it is possible to mount a partition encrypted by cryptsetup with LUKS securely and automatically on Ubuntu 10.0.4 LTS. For example, if I use the key for the encrypted partition, than that key has to be presented on a device that is not encrypted and if someone steals my disk they'll be able to find the key and decrypt the partition. Is there any safe way to mount an encrypted partition? If not, does anything exist to do what I want?

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• slow software raid

  - by Jure1873

  I've got software raid 1 for / and /home and it seems I'm not getting the right speed out of it. Reading from md0 I get around 100 MB/sec Reading from sda or sdb I get around 95-105 MB/sec I thought I would get more speed (while reading data) from two drives. I don't know what is the problem. I'm using kernel 2.6.31-18 hdparm -tT /dev/md0 /dev/md0: Timing cached reads: 2078 MB in 2.00 seconds = 1039.72 MB/sec Timing buffered disk reads: 304 MB in 3.01 seconds = 100.96 MB/sec hdparm -tT /dev/sda /dev/sda: Timing cached reads: 2084 MB in 2.00 seconds = 1041.93 MB/sec Timing buffered disk reads: 316 MB in 3.02 seconds = 104.77 MB/sec hdparm -tT /dev/sdb /dev/sdb: Timing cached reads: 2150 MB in 2.00 seconds = 1075.94 MB/sec Timing buffered disk reads: 302 MB in 3.01 seconds = 100.47 MB/sec Edit: Raid 1

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• Steps to install solely ubuntu 13.04 on Dell inspiron 14z ultrabook with SSD+HDD

  - by rishy

  I have tried a few things like disabling the Intel smart response, choosing AHCI in BIOS. But there are certain problems I am still facing. I can't see my SSD during the installation of ubuntu (I am planning to install Ubuntu on my SSD and other files on HDD). When I run Ubuntu my laptop gets overheated and battery backup reduces to 90 minutes. (I guess it's related to my graphic driver ATI Raedon HD 7570). Cooling fan seems to run at its fullest, it was working much better in windows. So, overall I wanted to know what are the exact steps I need to follow to install Ubuntu on my SSD and then use my HDD to keep other files, How can I get rid of overheating and battery backup problem?

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• RHEL 5.3 Kickstart - How specify location of individual package in Workstation folder?

  - by Ed

  I keep getting "package does not exist" errors during the install. I made a kickstart ISO to create an unattended install of a RHEL 5.3 build machine for C++ software releases. It pulls the kickstart config file from our internal web server. This is handy; it makes it easy to test and modify without having to make a new ISO. And I plan to check it in to version control if I can get it working. Anyway, the rpm packages are located in two folders on the disk; Client and Workstation. The packages install fine for the ones that are physically located under the Client folder. It cannot find those under the Workstation folder such as as doxygen and subversion complaining that packages do not exist. Is there a way to specify the individual package location? # ----------------------------------------------------------------------------- # P A C K A G E S # ----------------------------------------------------------------------------- %packages @gnome-desktop @core @base @base-x @printing @development-tools emacs kexec-tools fipscheck xorg-x11-server-Xnest xorg-x11-server-Xvfb #Packages Located in Workstation Folder *** Install can not find any of these ?? bison doxygen gcc-c++ subversion zlib-devel freetype-devel libxml2-devel Thanks in advance, -Ed

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• What are the differences between the "generic" and "server" kernel images provided by Ubuntu?

  - by dcrosta

  In particular, I'm wondering if there are any patches or config adjustments made to the disk cache size in the server edition. I'm running on a small system (256M RAM), and would like to experiment with keeping the disk cache size smaller so that there's more memory available for applications. I've found this page at Ubuntu's website, which neither answers my questions nor is about the 9.04 release.

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• How do you enable webcam support in Facebook for Ubuntu 10.04?

  - by Jonathan

  I think I have finally arrived at an insolvable equation: Chromium v.7 + Ubuntu 10.04 + Sun Java 6 + Webcam + Facebook + Flash 10 = non-functional All of those items listed above are potential points of failure in this situation, and any help narrowing them down would be fantastic. I am simply trying to enable webcame support directly through Facebooks website. Forum searches and the usual googling turn up few posts related to this specific equation. Two of the major suggestions include: 1) Installing the Sun (I refuse to say oracle sob)-provided Java implementation instead of the OpenJDK normally installed in Ubuntu. And yes, after installing it, I did update all my default supports to use the sun commands over the openjdk. 2) Somehow enabling Facebook as a permitted site to access my webcam using Flash settings. I have not been able to explore option 2 because I cannot find a way to adjust the Flash settings in chromium 7. Other factors that do not help include the fact that I am pretty sure facebook changes its webcam interface every 10 seconds just to keep troubleshooters and support personnel on their toes. If anyone has a OTP that informs us of the next shift in the app, a leak would be greatly appreciated!

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• Is it a good idea to put "screen -r" in my .bashrc?

  - by marcusw

  I'd like to use screen to keep ssh sessions alive on my server. It would be nice if I could automatically resume any running session for my user when I log in. The straightforward way to do this would be adding "screen -r" to my .bashrc, and this seems to work fine. I'm just wondering if this will break anything under conditions which I haven't tested yet. Anyone with experience here who can tell me whether this is what I should do?

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• What OpenSource iSCSI appliances/apps support windows clusters?

  - by Jimsmithkka

  I have been wanting to experiment with Windows clustering systems in my spare time, so I need a free, preferably open source, iSCSI Target that can support 2k3 and 2k8 fail-over and possibly High availability clustering. I have tried the ubuntu iscsi target package in a vmware environment, but it fails at the 2k8 tests. In simple terms I want to build a "Poor man's San" for windows and have it be able to do more than just be drives.

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• Package temperature above threshold, cpu clock throttled

  - by drN

  I am running 64 bit Ubuntu 11.10 on an i7 with 8gigs of ram. I thought of putting this on askubuntu.com but decided that maybe the question has a much broader appeal. I have the following error message popping up when I run math simulations. CPUn: Core temperature above threshold, cpu clock throttled (total events = xxxxxxx) CPUn: Package temperature above threshold, cpu clock throttled (total events = xxxxxxx) I realize that this is a hardware warning message (machine check exception, correct me if I am wrong). How do I turn these messages off? Since it doesn't seem to have a detrimental effect of my calculations or my computer (presumably), I don't like it cluttering up my virtual console screen with hundreds of these messages.

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• using "touch" to create directories?

  - by user62367

  1) in the "A" directory: find . -type f a.txt 2) in the "B" directory: cat a.txt | while read FILENAMES; do touch "$FILENAMES"; done 3) Result: the 2) "creates the files" [i mean only with the same filename, but with 0 Byte size] ok. But if there are subdirs in the "A" directory, then the 2) can't create the files in the subdir, because there are no directories in it. Question: is there a way, that "touch" can create directories?

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• using "touch" to create directories?

  - by user66732

  1) in the "A" directory: find . -type f a.txt 2) in the "B" directory: cat a.txt | while read FILENAMES; do touch "$FILENAMES"; done 3) Result: the 2) "creates the files" [i mean only with the same filename, but with 0 Byte size] ok. But if there are subdirs in the "A" directory, then the 2) can't create the files in the subdir, because there are no directories in it. Question: is there a way, that "touch" can create directories?

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• My NTFS Partition keeps becoming "unusable" on Ubuntu, Any Ideas?

  - by gopherman

  I just purchased a new 2TB Drive External Seagate, My main system uses both Windows and Ubuntu So I am pretty much stuck with keeping my drive as NTFS. I have done this without any problems before but since I got this new drive I have been having issues. When I first load up Ubuntu the drive mounts and runs fine, after an unspecified amount of time i start getting Input/Output errors when accessing the drive. When I goto the Disk Utility I get a message stating the drive is "Unknown or Unused", If I disconnect and reconnect the drive or reboot everything is fine again. There's no errors coming up with S.M.A.R.T and it seems to work fine while under windows. Any thoughts?

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• Proxmox: VMs and different public IPs

  - by Raj

  I have a server which has two NICs and both are directly connected to internet. I have five different public IP addresses available for the VMs. The host machine (Proxmox) doesn't need to use any (it'll use a private IP and that's all) but will have internet connection. I've gone through the Proxmox documentation and I'm not able to understand the big picture to set up the right network configuration for my needs. In short, what I have is: One server (Proxmox, host machine) On that server, 5 VMs are created 5 public IP addresses available (one for each VM), let's say: 80.123.21.1, 80.123.21.2, 80.123.21.3, 80.123.21.4, 80.123.21.5 What I have now for the host is the following: auto lo iface lo inet loopback auto eth0 iface eth0 inet manual auto eth1 iface eth1 inet manual auto vmbr0 iface vmbr0 inet static address 192.168.1.101 netmask 255.255.255.0 bridge_ports eth0 bridge_stp off bridge_fd 0 auto vmbr1 iface vmbr1 inet manual It can be reached from the internal network, so that's OK. It has internet connection, which is also OK. vmbr1 is going to be used by the VMs. Each VM will have its own IP on his network interfaces configuration file. For some reason, VMs will not have internet and they won't be able to have public IP address. If I use NAT, it will work correctly, but they will not use the public allocated IP addresses for them. Am I missing something?

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• What can be done to improve time synchronization on networks with sporadic internet access?

  - by anregen

  I'm looking for advice setting up time servers for a very non-typical network. I support many closed networks that have occasional access to the internet. A network would get access most days for a few hours, but would frequently go 1-3 weeks blacked-out. The computers/servers on this network are mostly *nix-based, but not all the same flavor. The entire network is mobile, so when it connects, it will have very different hops/latency to internet time servers. The servers on the closed network are powered-off frequently (at least daily). Right now, my gut tells me to use NTP (because I hate re-learning all the stuff that someone else already got working pretty well). But I have several issues, and am looking for someone with experience in this type of strange situation. I currently have no solution in place, I'm simply letting the internal clocks drift. This results in errors of ~600s in a majority of networks. I have seen mismatch worse than 10,000s. Is there something "better" than NTP in this situation? I know NTP likes to have very frequent, consistent access to servers that give nearly identical answers. I won't have that. How many internal NTP servers should I configure, so that during periods of internet blackout, I have internal time that is consistent within the closed network? There is no human access. No matter how large the mismatch, the server(s) must attempt to correct itself. Discrete steps are very bad. No matter how large the mismatch, the correction must be "slewed", not "stepped". I understand that this could take many hours to correct.

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• How can I ensure that my static ip address is read from /etc/network/interfaces rather than dhcp?

  - by jonderry

  This is a follow up to the following question. I'm trying to set a static IP by changing /etc/network/interfaces to the following: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.2.133 netmask 255.255.255.0 gateway 192.168.2.1 dns-nameservers 8.8.8.8 and then running /sbin/ifdown eth0; /sbin/ifup eth0. However, the change in IP address doesn't appear to take effect without editing /etc/dhcp/dhclient.conf and commenting out the following before running ifdown; ifup: request subnet-mask, broadcast-address, time-offset, routers, domain-name, domain-name-servers, domain-search, host-name, dhcp6.name-servers, dhcp6.domain-search, netbios-name-servers, netbios-scope, interface-mtu, rfc3442-classless-static-routes, ntp-servers, dhcp6.fqdn, dhcp6.sntp-servers; Strangely, after commenting out this line, running ifdown; ifup works, but when I uncomment it, the behavior does not revert to the previous behavior of ignoring changes to my settings in /etc/network/interfaces (this doesn't seem like a problem, but I really need to be able to repeat this problem so that I can be confident that my solution is robust) Also, I'd rather not have to edit /etc/dhcp/dhclient.conf to change my static IP since it seems I should be able to do this by only editing interfaces. Can anyone explain the issues I'm seeing above and suggest the best way of making changes to static IP addresses take effect that admits reproducibility so that I can be sure that my approach works?

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• dhcp code for pxe server

  - by avoq

  I'm trying to understand every single line of the following script but to no avail. I'd be glad if someone could help me. For sure I know its purpose is to start the DHCP server as well as the TFTP...But I'm stuck: killall dnsmasq 2>/dev/null dnsmasq --enable-tftp --tftp-root=$PXEDATA/boot --dhcp-boot=pxelinux.0,"$IP",$IP --dhcp-range=$(echo $IP | cut -d. -f1-3).50,$(echo $IP | cut -d. -f1-3).250, infinite --dhcp-option=option:router,192.168.0.254 --log-dhcp Why killall, why dnsmasq 2 What does "2" stand for? "--" what does it mean? Thanks a lot.

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• Force ID of user created by apt-get

  - by Bart van Heukelom

  Context: I'm automatically installing postgresql-9.1 on an Ubuntu server with apt-get. This creates the required postgres user. The Postgres data is on an external volume that survives reinstalls. This data is obviously owned by the postgres user. The problem I'm having is that the ownership is not recorded under the name postgres, but under the UID that postgres had at creation time. When the server is reinstalled, postgres sometimes gets a different UID, and no longer owns the data directory, and thus does not work. Question: Can I force the UID of the user postgres created by apt-get to something fixed? Or is there another way to solve my problem? (As you may have deduced, this is on Amazon EC2 with the data on an EBS volume)

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• Best Practice: Migrating Email Boxes (maildir format)

  - by GruffTech

  So here's the situation. I've got about 20,000 maildir email accounts chewing up a several hundred GB of space on our email server. Maildir by nature keeps thousands of tiny a** little files, instead of one .mbox file or the like... So i need to migrate all of these several millions of files from one server to the other, for both space and life-cycle reasons. the conventional methods i would use all work just fine. rsync is the option that comes immediately to mind, however i wanted to see if there are any other "better" options out there. Rsync not handling multi-threaded transfers in this situation sucks because it never actually gets up to speed and saturates my network connection, because of this the transfer from one server to another will take hours beyond hours, when it shouldn't really take more then one or two. I know this is highly opinionated and subjective and will therefore be marked community wiki.

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• rsync without password, none of google (server fault) tutorials worked

  - by Jake Armstrong

  I need to use rsync for a daily backup operation and in the past (on different servers) I managed to just use a rsa key etc, but now none of google (serverfault) tutorials work at all. It keeps asking me for a password. I have webmin and ssh/root access to both servers. My steps: create a key on server 1 send key.pub to server 2 add key.pub to .ssh/authorized_keys chmod 700 .ssh/authorized_keys go back to server 1 and try rsync and it keep asking for password... rsync command: rsync -avz -e ssh file.txt root@server2:/root EDIT: well, I cleaned up everything and this time, instead of inserting a custom name to the key I used the standard one on server1. sent the .pub to server2 and it worked as a charm... So the answer is that server1's ssh wasn't even using the right key...

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• My NTFS Partition keeps becoming "unusable" on Ubuntu, Any Ideas?

  - by gopherman

  I just purchased a new 2TB Drive External Seagate, My main system uses both Windows and Ubuntu So I am pretty much stuck with keeping my drive as NTFS. I have done this without any problems before but since I got this new drive I have been having issues. When I first load up Ubuntu the drive mounts and runs fine, after an unspecified amount of time i start getting Input/Output errors when accessing the drive. When I goto the Disk Utility I get a message stating the drive is "Unknown or Unused", If I disconnect and reconnect the drive or reboot everything is fine again. There's no errors coming up with S.M.A.R.T and it seems to work fine while under windows. Any thoughts?

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• Why do certain replied emails missing threading when replied back in Mutt?

  - by yarun can

  I use Mutt for emails. I have threads enabled and I can see that most of the emails are threaded in Mutt. So that is all good. But sometimes I reply to an email and the answer(from other person) to my replied email wont be part of any threads. The thing is that when I reply in Mutt (which I use Vim to edit them), the subject parts keeps getting longer and longer with many "Re"s. That is the case with those emails with missing threads. I have: set strict_threads="yes" set sort="threads" set edit_headers=yes I am wondering if this has anything to do with Mutt or the person I am communicating over email. Could this one be the culprit? set metoo=yes Any suggestions?

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• Debian 5.0.8 won't detect my ethernet adapter

  - by PaulH

  I'm installing Debian 5.0.8 on a Dell Latitude E6410 using the network install x86 CD. Unfortunately, it won't detect my Ethernet adapter. Specifically, I get the error: No Ethernet card was detected. If you know the name of the driver needed by your Ethernet card, you can select it from the list. lspci shows: 00:19.0 Ethernet controller: Intel Corporation Device 10ea (rev 05) That should correspond to the e100e driver. But, if I select it from the list, the install CD still fails to detect it. Ubuntu 10.10 and Windows 7 are able to use this device with no problem. Does anybody know what I can do to make Debian use my Ethernet adapter? Thanks, PaulH

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• How can I measure TCP timeout limit on NAT firewall for setting keepalive interval?

  - by jmanning2k

  A new (NAT) firewall appliance was recently installed at $WORK. Since then, I'm getting many network timeouts and interruptions, especially for operations which would require the server to think for a bit without a response (svn update, rsync, etc.). Inbound SSH sessions over VPN also timeout frequently. That clearly suggests I need to adjust the TCP (and ssh) keepalive time on the servers in question in order to reduce these errors. But what is the appropriate value I should use? Assuming I have machines on both sides of the firewall between which I can make a connection, is there a way to measure what the time limit on TCP connections might be for this firewall? In theory, I would send a packet with gradually increasing intervals until the connection is lost. Any tools that might help (free or open source would be best, but I'm open to other suggestions)? The appliance is not under my control, so I can't just get the value, though I am attempting to ask what it currently is and if I can get it increased.

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• Using command line to connect to a wireless network with an http login

  - by Shane

  I'm trying to connect to a wifi network where it hijacks all requests and redirects you to a page where you have to agree to a terms of use before it lets you connect to the actual outside world. This is a pretty common practice, and usually doesn't pose much of a problem. However, I've got a computer running Ubuntu 9.10 server with no windowing system. How can I use the command line to agree to the terms of use? I don't have internet access on the computer to download packages via apt-get or anything like that. Sure, I can think of any number of workarounds, but I suspect there's an easy way to use wget or curl or something. Basically, I need a command line solution for sending an HTTP POST request essentially clicking on a button. For future reference, it'd be helpful to know how to send a POST request with, say, a username and password if I ever find myself in that situation in another hotel or airport.

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• How do I use command line and wmctrl to make a window larger than the screen to get a huge screenshot?

  - by Mnebuerquo

  I use a program which makes a large image which I have to scroll to view. The program has no way to save the image, and I have no access to the source to modify it. The only way I have to get the image from the program is by screenshot. My goal is to save the full size image without having to piece together individual screenshots. I'm using this script to try taking a screenshot: #!/bin/bash window=$(wmctrl -l | grep "Program$" | awk '{print $1}') wmctrl -v -i -r $window -e '0,0,0,6030,5828' wmctrl -i -a $window import -window $window ~/Desktop/screenshot.png This uses wmctrl to get the window id ($window) for a window named "Program". It then tries to resize the window to the desired dimensions. It uses imagemagick (import) to save a screenshot.png on the user's Desktop. All of this works except the resize step. I can resize the window using wmctrl -r -e, but sizes greater than the screen size don't work. I'm using Ubuntu 10.04 and the Gnome Desktop. I run two monitors, but I've tried this with one of them disabled. Is there a way to resize the window larger than my screen to get a huge screenshot?

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