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• Graphic driver for Targa Now NT9231

  - by Lumio

  I thought of installing Xubuntu on my elder Targa Now nettop and didn't think about the driver option. So now I'm here with a fresh Xubuntu installation and looking for graphic drivers. I found someone who might have had a "good" result with SiS - and the package is already installed, but I can't get my xorg.conf right. This is how my xorg.conf looks like right now: Section "Device" Identifier "Configured Video Device" Driver "sis" EndSection Section "Monitor" Identifier "Screen 0" Modeline "1024x768_60.00" 64.11 1024 1080 1184 1344 768 769 772 795 -HSync +Vsync #HorizSync 30.0-62.0 #VertRefresh 50.0-70.0 EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" DefaultDepth 24 SubSection "Display" Depth 24 Modes "1024x768" "800x600" EndSubSection EndSection Thanks for every help given!

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• 100% CPU load on Ubuntu 10.04.3 LTS 64bit

  - by deadtired

  I have 2 days since I am trying to fix this issue, with no success. The server is a mysql database server. Hardware: DELL Poweredge 1950, 2x Intel Xeon Quad Core E5345 @ 2.33GHz, 16 Gb mem, 2x 146Gb SAS (software RAID1) Software: Ubuntu 10.04.3 LTS, MySQL 5.1.41 Issue: while mysql is not used and runs with no database, everything seems alright. As soon as I install a database, it has the reason to bring all 8 cores in 100% with low memory consumption. So, you can imagine the load average goes high (I saw 212 load average for the first time). The server doesn't become unresponsive, but you can see it's slow while browsing the project installed. Additional info: the database used is not more than 24MB and it was moved from a server with less resources and a lot more larger databases. So it's not the database/project. my.cnf is not a reason also, as I used both default one and the one I use on the same distribution on another server.What is interesting is that mysql doesn't close any process and runs to the limit of the max_connections. Logs are quiet. Nothing there. I switched to this Ubuntu version after I suspected some problems in the newly Ubuntu 11.10 server. This one worked alright for an hour after I made a kernel upgrade to 3.0.1 (it was using the memory also) I tested disk speed and seems alright. Some more output on the running server: dstat -cndymlp -N total -D total 3: htop command: Idea? Did anyone meet the same problem? Any fix you can think of?

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• impossible to connect.. days trying..

  - by dany

  I have a problem: I am on Debian. I configured my nic with a static ip (192.168.1.56). When I try to connect to a network, initially with ifconfig eth2 I get (correctly): eth2 inet addr:192.168.1.56 .... inet6 addr: fe80:221:ff:fe96:4598/64 but after a few seconds the 102.168.1.56 disappears and after some other seconds disappears the inet6 address too. When I press in the nm-applet it requires me the password but in the meantime it try to connect. At uni, the connection is a DHCP one. It works for the first few seconds but after it doesn't. Any possible solution? Here it is the relevant part of the syslog: (static ip configuration) http://pastebin.com/u3BPAsda

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• What are working xorg.conf settings for using a Matrox TripleHead2Go @ 5040x1050?

  - by Brendan Abel

  I'm trying to configure xorg.conf to correctly set the resolution of my screens. I'm using a matrox triplehead, so the monitor is a single 5040x1050 screen. Unfortunately, it's being incorrectly set to 3840x1024. Here is my xorg.conf: # nvidia-settings: X configuration file generated by nvidia-settings # nvidia-settings: version 260.19.06 (buildd@yellow) Mon Oct 4 15:59:51 UTC 2010 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" Option "Xinerama" "0" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" # HorizSync source: edid, VertRefresh source: edid Identifier "Monitor0" VendorName "Unknown" ModelName "Matrox" HorizSync 31.5 - 80.0 VertRefresh 57.0 - 75.0 #Option "DPMS" Modeline "5040x1050@60" 451.27 5040 5072 6784 6816 1050 1071 1081 1103 #Modeline "5040x1050@59" 441.28 5040 5072 6744 6776 1050 1071 1081 1103 #Modeline "5040x1050@57" 421.62 5040 5072 6672 6704 1050 1071 1081 1103 EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce 9800 GTX+" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 Option "TwinView" "0" Option "metamodes" "5040x1050" SubSection "Display" Depth 24 EndSubSection EndSection

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• Lubuntu LiveCD disabling auto-mount.

  - by PxE Booter

  In cooperation with my IT teacher we want to boot all PC's in IT class with Lubuntu. I've successfully set up PXE server, but there is one thing that worries us. Harddrives shouldn't be accessible from booted Lubuntu(normal user only). Would adding to fstab something like: /dev/sda1 /Idk/What auto noauto work? I'd like to add that I can uncompress squashfs livecd filesystem. If no, what other solution is there, to block auto-mounting /dev/sda drive?

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• Best practices to avoid Jenkins error: sudo: no tty present and no askpass program specified

  - by s g

  When running any sudo command from Jenkins I get the following error: sudo: no tty present and no askpass program specified I understand that I can solve this by adding a NOPASSWD entry to my /etc/sudoers file which will allow user jenkins to run commands without needing a password. I can add an entry like this: %jenkins ALL=(ALL)NOPASSWD:/home/vts_share/test/sudotest.sh ...but this leads to the following issue: how to avoid specifying full path in sudoers file? I can add an entry like this: %jenkins ALL=NOPASSWD: ALL ...but this allows user jenkins to avoid the password prompt for all commands, which seems a bit unsafe. I'm just curious what my options are here, and if there are any best practices I should consider.

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• linux container bridge filters ARP reply

  - by Dani Camps

  I am using kernel 3.0, and I have configured a linux container that is bridged to a tap interface in my host computer. This is the bridge configuration: :~$ brctl show bridge-1 bridge name bridge id STP enabled interfaces bridge-1 8000.9249c78a510b no ns3-mesh-tap-1 vethjUErij My problem is that this bridge is dropping ARP replies that come from the ns3-mesh-tap-1 interface. Instead, if I statically populate the ARP tables and ping directly everything works, so it has to be something related to ARP. I have read about similar problems in related posts, and I have tried with the solutions explained therein but nothing seems to work. Specifically: ~$ grep net.bridge /etc/sysctl.conf net.bridge.bridge-nf-call-arptables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-filter-vlan-tagged = 0 net.bridge.bridge-nf-filter-pppoe-tagged = 0 arptables and ebtables are not installed. iptables FORWARD is all set to accept: Chain FORWARD (policy ACCEPT) target prot opt source destination The bridged interfaces are set to PROMISC: ~$ ifconfig ns3-mesh-tap-1 Link encap:Ethernet HWaddr 1a:c7:24:ef:36:1a ... UP BROADCAST PROMISC MULTICAST MTU:1500 Metric:1 vethjUErij Link encap:Ethernet HWaddr aa:b0:d1:3b:9a:0a .... UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 The macs learned by the bridge are correct (checked with brctl showmacs). Any insight on what I am doing wrong would be greatly appreciated. Best Regards Daniel

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• How do I limit concurrent sftp / port forwarding logins

  - by Kyoku

  I have ssh set up so my users can only access sftp and port forwarding, how can I limit the number of concurrent logins on a per user basis? In my sshd_config I have UsePAM set to yes and in /etc/security/limits.conf I have: username - maxlogins 1 I also tried: username hard maxlogins 1 Neither of these works and the users can still log in multiple times.

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• Ubuntu 10.10 - PC shutdown before boot shortly after BIOS loads

  - by clem

  Since installing Ubuntu 10.10 from Karmic I've started getting problems with starting up the PC. I've done a complete wipe (Boot and Nuke) of the hard drive and reinstalled Ubuntu 10.10 but the problem still occurs. There is no dual boot on the PC, just Ubuntu. Here is the problem: Each morning, when I turn the PC on from being off overnight, the PC starts up and loads the BIOS. I get the following message Verifying DMI Pool Data... K8 NPT Data Change...Update New Data to DMI!....... Then poof the computer shuts off. However, after switching the computer back on around 6 or 7 times after it's turned itself off, it will eventually boot up without any problem. Also, once up and running for a while, I can shutdown and restart the PC first time, without any issues. I have also noticed a problem with the USB mouse being recognised and once I finally get the computer booted up, I need to unplug and then plug the mouse back in to get it working. I've opened the PC up and checked the connections (cables, cards and memory) and it all seems fine. The main issue with troubleshooting this problem is I cannot test any suggestions or fixes until the next morning because once the computer is up and running it will remain so! I do not leave the computer on overnight to save energy. So.. Is this a hardware / boot software issue? This is a very odd problem and I have googled to no avail. Any suggestions?

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• how do I set up a virtual host (it's not working, and I've done everything right)

  - by piratepartypumpkin

  My router redirects port 80 to port 8080. My router works fine and my domain name is routed properly. This is my virtual hosts file: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot /home/admins/lampstack-5.3.16-0/apps/wordpress ServerName example.com ServerAlias www.example.com </VirtualHost> I can access my website by entering "mywebsite.com:8080" but I cannot access it by entering "mywebsite.com" For further information, this is a part of my httpd.conf: Listen 8080 Servername localhost:8080 DocumentRoot "/home/admins/lampstack-5.3.16-0/apache2/htdocs <Directory /> Options FollowSymLinks AllowOverride None Order deny, allow deny from all </Directory> <Directory "/home/admins/lampstack-5.3.16-0/apache2/htdocs"> Options FollowSymLinks AllowOverride None Order allow, deny allow from all </Directory>

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• dpkg: error processing /var/cache/apt/archives/python2.6-minimal_2.6.6-5ubuntu1_i386.deb (--unpack)

  - by udo

  I had an issue (Question 199582) which was resolved. Unfortunately I am stuck at this point now. Running root@X100e:/var/cache/apt/archives# apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following NEW packages will be installed: file libexpat1 libmagic1 libreadline6 libsqlite3-0 mime-support python python-minimal python2.6 python2.6-minimal readline-common 0 upgraded, 11 newly installed, 0 to remove and 0 not upgraded. Need to get 0B/5,204kB of archives. After this operation, 19.7MB of additional disk space will be used. Do you want to continue [Y/n]? Y (Reading database ... 6108 files and directories currently installed.) Unpacking python2.6-minimal (from .../python2.6-minimal_2.6.6-5ubuntu1_i386.deb) ... new installation of python2.6-minimal; /usr/lib/python2.6/site-packages is a directory which is expected a symlink to /usr/local/lib/python2.6/dist-packages. please find the package shipping files in /usr/lib/python2.6/site-packages and file a bug report to ship these in /usr/lib/python2.6/dist-packages instead aborting installation of python2.6-minimal dpkg: error processing /var/cache/apt/archives/python2.6-minimal_2.6.6-5ubuntu1_i386.deb (--unpack): subprocess new pre-installation script returned error exit status 1 Errors were encountered while processing: /var/cache/apt/archives/python2.6-minimal_2.6.6-5ubuntu1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) results in above error. Running root@X100e:/var/cache/apt/archives# dpkg -i python2.6-minimal_2.6.6-5ubuntu1_i386.deb (Reading database ... 6108 files and directories currently installed.) Unpacking python2.6-minimal (from python2.6-minimal_2.6.6-5ubuntu1_i386.deb) ... new installation of python2.6-minimal; /usr/lib/python2.6/site-packages is a directory which is expected a symlink to /usr/local/lib/python2.6/dist-packages. please find the package shipping files in /usr/lib/python2.6/site-packages and file a bug report to ship these in /usr/lib/python2.6/dist-packages instead aborting installation of python2.6-minimal dpkg: error processing python2.6-minimal_2.6.6-5ubuntu1_i386.deb (--install): subprocess new pre-installation script returned error exit status 1 Errors were encountered while processing: python2.6-minimal_2.6.6-5ubuntu1_i386.deb results in above error. Running root@X100e:/var/cache/apt/archives# dpkg -i --force-depends python2.6-minimal_2.6.6-5ubuntu1_i386.deb (Reading database ... 6108 files and directories currently installed.) Unpacking python2.6-minimal (from python2.6-minimal_2.6.6-5ubuntu1_i386.deb) ... new installation of python2.6-minimal; /usr/lib/python2.6/site-packages is a directory which is expected a symlink to /usr/local/lib/python2.6/dist-packages. please find the package shipping files in /usr/lib/python2.6/site-packages and file a bug report to ship these in /usr/lib/python2.6/dist-packages instead aborting installation of python2.6-minimal dpkg: error processing python2.6-minimal_2.6.6-5ubuntu1_i386.deb (--install): subprocess new pre-installation script returned error exit status 1 Errors were encountered while processing: python2.6-minimal_2.6.6-5ubuntu1_i386.deb is not able to fix this. Any clues how to fix this?

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• Does anyone know why rsync would keep sending the files over and over again?

  - by beagleguy

  I'm trying to using rsync to backup some files, about half a TB. It's now it a state where it keeps sending the same files everytime it runs. for example: rsync -av /data/source/* user@host:/data/dest sending incremental file list source/file1.txt source/file2.txt I then verify those files are copied over... then the next time it runs it does the same thing rsync -av /data/source/* user@host:/data/dest sending incremental file list source/file1.txt source/file2.txt any idea why it's getting stuck on these files? I've tried to wipe the whole dest directory out and start over but no luck. thanks,

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• Linux arp cache timeout values

  - by Jak

  I'm trying to configure sane values for the Linux kernel arp cache timeout, but I can't find a detailed explanation as to how they work anywhere. Even the kernel.org documentation doesn't give a good explanation, I can only find recommended values to alleviate overflow. Here is an example of the values I have: net.ipv4.neigh.default.gc_thresh1 = 128 net.ipv4.neigh.default.gc_thresh2 = 512 net.ipv4.neigh.default.gc_thresh3 = 1024 Now, from what I've gathered so far: gc_thresh1 is the number of arp entries allowed before the garbage collector starts removing any entries at all. gc_thresh2 is the soft-limit, which is the number of entries allowed before the garbage collector actively removes arp entries. gc_thresh3 is the hard limit, where entries above this number are aggressively removed. Now, if I understand correctly, if the number of arp entries goes beyond gc_thresh1 but remains below gc_thresh2, the excess will be removed periodically with an interval set by gc_interval. My question is, if the number of entries goes beyond gc_thresh2 but below gc_thresh3, or if the number goes beyond gc_thresh3, how are the entries removed? In other words, what does "actively" and "aggressively" removed mean exactly? I assume it means they are removed more frequently than what is defined in gc_interval, but I can't find by how much.

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• Windows-to-linux: Putty with SSH and private/public key pair

  - by Johnny Kauffman

  I spent about 3 hours trying to figure out how to connect to a linux box from my windows machine using putty without having to send the password. This is connecting to an Ubuntu server that is using OpenSSH. The private key is SSH-2 RSA, 1024 bits. I am connecting using SSH2. I have run into the more common problems already: Putty generated the public key in the "wrong format". I have corrected this (as seen on this blog post). However, since I am not yet connected, I cannot absolutely confirm that this file is in the correct format. The key is all on a single line now, and I have tried adding/removing line breaks at the end of the file. I've also tried the public file doctoring process a few times to ensure that I haven't flubbed up the manual conversion. Even so, I have no way to verify accuracy here. The permissions were at once point wrong as well, specifically meaning that the file had too many permissions. I had to solve this too and I know it got past this because I no longer see a related error in /var/log/auth.log. I've tried both authorized_keys and authorized_keys2 in case the server has an old version of OpenSSH, but this changed nothing. I do have access as a user. After this keyfile stuff fails, I can enter my password instead The only remaining nibble of information I have is that it claims I have the alleged password wrong: sshd[22288]: Failed password for zzzzzzz from zz.zz.zz.zz port 53620 ssh2 Even so, as far as I can tell, this is just a lazy try/catch somewhere, since I don't think there's a password involved at all. I see nothing else in any of the /var/log files of use. What else could be wrong?

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• netmask: command not found

  - by Ian R.

  I purchased a new server with a few ip's so I modified the /etc/network/interfaces file recently so that my ip's can go live. While editing that file I created a backup and deleted the original file. I recreated the interfaces file using the touch command and gave +x permissions but now, when trying to restart the interface (/etc/network/interfaces restart) I get all sorts of errors: /etc/network/interfaces: line 10: iface: command not found /etc/network/interfaces: line 11: address: command not found /etc/network/interfaces: line 12: netmask: command not found /etc/network/interfaces: line 13: auto: command not found Can any1 point what I forgot to do? Thanks.

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• Does the mplayer-mozilla plugin have a problem with long DIVX videos or is this a problem with the U

  - by creamcheese

  Pretty consistently when I'm watching a long DIVX movie in the browser on Karmic - say 2 hours or so - the mplayer-mozilla player stops after a half-hour or an hour and resets back to 0, so I have to reload the whole movie again over the web. It happens repeatedly so I never get past the half-way point in the DIVX version of the movie - I have to watch a flash version instead. I don't know if this is an mplayer issue or a Firefox memory issue. Anyone have any idea how to resolve this?

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• Desktop Provisioning for a Small Linux Software Development Team

  - by deakblue

  Goal: Get a small team using a standard development image rather than 4 software devs setting up their own environments. Why: it takes a day or days to install a distro, build-specific libraries, tools like editors and IDEs, mysql, couchdb, java, maven, python, android-sdk, etc. It's a giant PITA that when repeated 4 times by 4 developers (not sys admins) wastes time and generates annoying divergences that crop up later (it-builds-on-my-box syndrome). There's no sharing of productivity, settings, tricks, scripts, set-ups. Some of this is helped by segregating the build systems into headless virtualbox images. This doesn't really address tooling though or the GUI-desktop dev that needs doing. So I see three basic strategies, ghosting, virtualization, and finally creating a kind of in-house linux distro (I guess Google does something like this). The target dev environment is based on Debian OpenBox and must allow a mix of 3rd gen Core i7 notebooks 8GB-minimum to work both single and multihead. Important, the lappies are not the same, but a mix of 2012 macbooks and PCs. So: virtualization: is doing all of your work within a VM, like VirtualBox, practical on this hardware or annoying. ghosting: will laptops from different manufacturers make this impractical. DIY distro: short of scripting a bunch of package installs, I don't know if there's any "distro-maker" that could keep this from being an epic project of scripting package installs. So any advice?

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• Copying files between linux machines with strong authentication but without encryption

  - by Zizzencs

  I'm looking for a suitable program to copy files from one linux machine to another one. The program should be able to do authentication but it should not do encryption. The reason behind the latter is the lack of CPU power to do the encryption. I copy backups from ~70 machines to a single backup server simultaneously. The single server is an HP Proliant DL360 G7, with 10 Gbps ethernet connection and an FC storage backend that can do 4 Gbps. Through FTP I can write ~400MB/sec to the storage (that's about what I want) but through ssh with arcfour I can only do ~100MB/sec while having 100% CPU usage. That's why I want file transfers not to be encrypted. The alternatives that I found not really suitable: rcp: no authentication, forget it FTP: making the authentication "secure" (at least preventing plain-text password exchange) is possible but not really easy and I haven't found a method to force any FTP daemon to encrypt the control channel (for the authentication) and not to encrypt the data channel (for data transfers) SCP/SFTP: in farely recent ssh(d) implementations you can't turn off encryption. The best you can do is to use the arcfour cypher for the encryption but it sill uses too much CPU power for my needs. rsync over ssh: same problems as with SCP/SFTP. plain rsync: from the documentation of rsyncd: "The authentication protocol used in rsync is a 128 bit MD4 based challenge response system. This is fairly weak protection, though (with at least one brute-force hash-finding algorithm publicly available), so if you want really top-quality security, then I recommend that you run rsync over ssh." It's a no-go. Is there a protocol/program that can do exactly what I want? (A big plus would be if it could work on windows as well and/or if it would support rsync-stlye copying/synchronization (e.g. copy only the differences).)

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• configuring apache with mod_mono for .net app

  - by Mystere Man

  I'm having a huge problem getting mod_mono and apache configured to work correctly. I've had this working at one time, but I can't seem to figure out where i'm going wrong. I'm using mono-server4. I'm trying to use a seperate port from the main website. So I have in /etc/apache2/sites-available (with a link from sites-enabled) a vhost configuration that looks like this: <VirtualHost *:9999> ServerName XXX ServerAdmin web-admin@XXX DocumentRoot /var/xxx MonoServerPath XXX "/usr/bin/mod-mono-server4" MonoDebug XXX true MonoSetEnv XXX MONO_IOMAP=all MonoApplications XXX "/:/var/xxx" <Location "/"> Allow from all Order allow,deny MonoSetServerAlias XXX SetHandler mono SetOutputFilter DEFLATE SetEnvIfNoCase Request_URI "\.(?:gif|jpe?g|png)$" no-gzip dont-vary </Location> <IfModule mod_deflate.c> AddOutputFilterByType DEFLATE text/html text/plain text/xml text/javascript </IfModule> </VirtualHost> I used mono-server4-admin to create the application mono-server4-admin --path=/var/xxx --app=/XXX --port=9999 When i start apache, it gives the error: Syntax error on line 13 of /etc/apache2/sites-enabled/xxx: Server alias 'XXX, not found. This corresponds with the MonoSetServerAlias statement. So I commented it out, and when I do that apache starts. However, when I try to access the site, I get a 500 error. The access log indicates that it's trying to access the app on port 80, rather than 9999. I'm not sure what the problem is here. Can anyone help me get figure out where I went wrong? My mono-server4-hosts.conf contains this: # start /etc/mono-server4/conf.d/RMRSite/10_XXX Alias /XXX "/var/xxx" AddMonoApplications default "/XXX:/var/xxx" <Directory /var/xxx> SetHandler mono <IfModule mod_dir.c> DirectoryIndex index.aspx </IfModule> </Directory> # end /etc/mono-server4/conf.d/XXX/10_XXX Also, my /etc/mono-server4/conf.d/XXX/10_XXX contains this: This is the configuration file for the XXX virtualhost path = /var/xxx alias = /XXX vhost = localhost port = 9999

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• IBM Server searching for secondary server

  - by user1241438

  I just bought the following server IBM System x3950 Server, 4 x 3.0GHz Dual Core, 32GB, 6 x 73.4GB 10K SAS RAID, 256MB BBWC, 2x Power, CD-RW/DVD When i boot it up, it says "Searching for secondary server" and hangs their for almost 10 mins. After 10 mins, it says timeout on searching chassis 2. But after this it proceed to boot the OS properly. But my frustration, i need to wait for almost 15 mins to boot everytime. How do i prevent this error message.

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• Large, high performance object or key/value store for HTTP serving on Linux

  - by Tommy

  I have a service that serves images to end users at a very high rate using plain HTTP. The images vary between 4 and 64kbytes, and there are 1.300.000.000 of them in total. The dataset is about 30TiB in size and changes (new objects, updates, deletes) make out less than 1% of the requests. The number of requests pr. second vary from 240 to 9000 and is dispersed pretty much all over, with few objects being especially "hot". As of now, these images are files on a ext3 filesystem distributed read only across a large amount of mid range servers. This poses several problems: Using a fileysystem is very inefficient since the metadata size is large, the inode/dentry cache is volatile on linux and some daemons tend to stat()/readdir() it's way through the directory structure, which in my case becomes very expensive. Updating the dataset is very time consuming and requires remounting between set A and B. The only reasonable handling is operating on the block device for backup, copying, etc. What I would like is a deamon that: speaks HTTP (get, put, delete and perhaps update) stores data it in an efficient structure. The index should remain in memory, and considering the amount of objects, the overhead must be small. The software should be able to handle massive connections with slow (if any) time needed to ramp up. Index should be read in memory at startup. Statistics would be nice, but not mandatory. I have experimented a bit with riak, redis, mongodb, kyoto and varnish with persistent storage, but I haven't had the chance to dig in really deep yet.

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• How to configure a large mtu (linux)

  - by Somejan

  I have a gigabit ethernet connection from my laptop to my router, and a working ipv6 connection to the internet. I can receive very large packets from sites on the internet, with sizes up to at least 10000 bytes (according to wireshark). (edit: turns out to be linux's 'generic receive offload') However, when trying to send anything, my local computer fragments at just below 1500 bytes for ipv6. (On ipv4, I can send tcp packets to the internet of at least 1514 bytes, I can ping with packets up to the configured mtu of 6128 but they are blackholed.) I'm on ubuntu 12.04. I have configured an mtu for my eth0 of 6128 (the maximum it accepts), both using ip link set dev eth0 mtu 6128 and in the NetworkManager applet gui, and restarted the connection. ip link show eth0 shows the 6128 mtu is indeed set. ip -6 route shows that none of the paths the kernel knows about have an mtu set. I can ping over ipv4 with packets up to 6128 bytes (though I don't get responses), but when I do ping6 myrouter -c3 -s1500 -Mdo I get error replies from my own computer saying that the packets are too large and the mtu is 1480. I have confirmed with Wireshark that nothing is put on the wire, and the replies are indeed generated by my own computer. So, how do I get my computer to use the larger mtu?

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• Unable to mount root fs over NFS [on hold]

  - by johnmadrak

  I am attempting to set up a Raspberry Pi running Pidora to boot from an NFS share. My configuration in cmdline.txt is: dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/nfs nfsroot=<serverip>:/fake/path,nfsvers=3,rw,nolock nfsrootdebug ip=dhcp elevator=deadline rootwait On the Pi, the output I see is: IP-Config: Got DHCP answer from <router>, my address is <clientip> IP-Config: Complete: device=eth0, hwaddr=<macaddress>, ipaddr=<clientip>, mask=255.255.255.0, gw=<routerip> host=<clientip>, domain=, nis-domain=(none) bootserver=<routerip>, rootserver=<serverip>, rootpath= nameserver0=<routerip> (It pauses for a bit here) VFS: Unable to mount root fs via NFS, trying floppy VFS: Cannot open root device "nfs" or unknown-block(2,0); error -6 Please append a correct "root=" boot option; here are the available partitions: ..... On the NFS Server (an OpenVZ Container), the output I see in the /var/log/messages is: Aug 22 23:24:01 vps-4178 rpc.mountd[928]: authenticated mount request from <clientip>:783 for /fake/path (/fake/path) Aug 22 23:24:38 vps-4178 rpc.mountd[928]: authenticated mount request from <clientip>:741 for /fake/path (/fake/path) Aug 22 23:25:25 vps-4178 rpc.mountd[928]: authenticated mount request from <clientip>:752 for /fake/path (/fake/path) Aug 22 23:26:12 vps-4178 rpc.mountd[928]: authenticated mount request from <clientip>:876 for /fake/path (/fake/path) To test, I've made sure I can mount (non-root) from both the Pi and another machine and it worked. Does anyone have an idea on what could be wrong or how to narrow it down? Thank you in advanced for your help.

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• Caching/preloading files on Linux into RAM

  - by Andrioid

  I have a rather old server that has 4GB of RAM and it is pretty much serving the same files all day, but it is doing so from the hard drive while 3GBs of RAM are "free". Anyone who has ever tried running a ram-drive can witness that It's awesome in terms of speed. The memory usage of this system is usually never higher than 1GB/4GB so I want to know if there is a way to use that extra memory for something good. Is it possible to tell the filesystem to always serve certain files out of RAM? Are there any other methods I can use to improve file reading capabilities by use of RAM? More specifically, I am not looking for a 'hack' here. I want file system calls to serve the files from RAM without needing to create a ram-drive and copy the files there manually. Or at least a script that does this for me. Possible applications here are: Web servers with static files that get read alot Application servers with large libraries Desktop computers with too much RAM Any ideas? Edit: Found this very informative: The Linux Page Cache and pdflush As Zan pointed out, the memory isn't actually free. What I mean is that it's not being used by applications and I want to control what should be cached in memory.

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• Mail Server configuration to accept all incoming message but option to Send Outgoing to a specific s

  - by user31869

  Is there any Mail Server which can accept all incoming message to a user and to a outgoing message should be sent to a particular usernames not to other accounts .

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