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• hplip gui required plugin

  - by Terence Stamp

  I downloaded hplip gui to manage my printer, but in order to set it up correctly, you must click the green puzzle piece labeled "install required plugin." Once you do, you are presented with two options: download it from HP's server or locate the file locally on your hard disk. In the past, I have had success with downloading it from HP's server. Currently, my luck is not as good. My question is simple. Where can I find the plugin on the Internet so that I might download it and install it using the second option of installing from my hard drive?

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• How to use Google Talk video chat on Redhat?

  - by eSKay

  Is there some way? This page says its not possible 'normally'. Is there a workaround for this?

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• Dynamips and Tap Devices, To and From the same machine

  - by Kyle Brandt

  I am setting up a dynamips/dynagen lab and am wondering if there is any way to get traffic to route out one tap devices, go into the lab, and come back to a tap device on the same machine. I have tried host specific routes as well as removing the route created when I give the tun device an ip via ifconfig. With both of these, traffic always preferes the attached devices and won't go through my lab. Any way to make this work without a separate machine or vm?

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• Can't SSH to remote server,how to avoid this

  - by snow8261

  From time to time,we suffer problems like we can not remote connect to our server via ssh.So we have to send someone on site to restart the computer for this problem.It causes a lot of pain.The situation is we have to remote connect to our server,which are very important like database server and application server and etc.We have met problems like ssh hang,like command ssh [email protected] with no response. when using ssh -v debug mode, it says : debug1: Connection established. debug1: identity file /.ssh/identity type -1 debug1: identity file /.ssh/id_rsa type -1 debug1: identity file /.ssh/id_dsa type -1 debug1: loaded 3 keys and we met this situation many times with no clue how to solve it.Is any log which can identify this problem? or Is there a tool for this problem? help needed!Any idea are appreciated.

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• Chmod 644 on /etc/ any way to fix?

  - by DazSlayer

  I tried to tab complete something and I guess it wasnt there. I know you are not supposed to set the permissions to /etc/ like that, but my permissions seem to be all messed up. whoami prints out cannot find name for user ID 1002 and I cannot cd into /etc/ anymore. passwd and shadow use 640 and 644 so I am not sure why this is a problem. Regardless, is there any way to fix this? The command run was sudo chmod 644 /etc/ I have no name!@vpn-server:/$ whoami whoami: cannot find name for user ID 1002 I have no name!@vpn-server:/$ cd etc bash: cd: etc: Permission denied I have no name!@vpn-server:/$ ls -al etc d????????? ? ? ? ? ? . d????????? ? ? ? ? ? .. d????????? ? ? ? ? ? acpi -????????? ? ? ? ? ? adduser.conf I have no name!@vpn-server:/$ sudo su sudo: can't open /etc/sudoers: Permission denied

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• How can I sort out Xephyr's keyboard mapping?

  - by qedi

  When I start up Xephyr inside of X, my keyboard map becomes wonky mostly just for non-printing characters. I can't use arrow keys. According to xev, The down arrow gets mapped to Super_R. The up arrow is Print Screen. PgDown is mapped to "Menu". My keyboard works fine in the original X display (:0), but in the Xephyr subdisplay (:1), nothing else quite works right. I don't have any funky xmodmap things going on in my main X display that I'm aware of. All I really do is setxkbmap -option ctrl:swapcaps.

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• How to solve " dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the prob

  - by Hoang

  I get this message when my ubuntu system was crashed. How to solve it?

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• x11vnc is slow, but using only 10% of available bandwidth

  - by mmm

  I am using x11vnc over 15Mbit/s network with 20ms latency. When the screen is changing a lot x11vnc is slow - for example when I switch a tab in a browser, it takes almost two seconds until the view is fully redrawn. The strange thing is that max connection speed of x11vnc is even during slow redrawing only about 10% of the available bandwidth. Why is x11vnc not using available bandwidth to speed the redrawing up? For example scp is using 100% of available bandwidth without problems. How can I identify what is the bottleneck for x11vnc on my system? So far I think: 10% network usage = network is not a bottleneck fb read rate: 601 MB/sec = reading fb is not a bottleneck Any ideas how can I further profile x11vnc and find out what is causing a slowdown? For example is there any switch for x11vnc to show how much data it is handling and how long it takes to grab a screen, process and compress it and send it over the network?

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• NFS inherit permissions from shared directory - Mac OS client

  - by devius

  Short question: Is there a way to have files on a NFS share on the client inherit the permissions of the shared directory? Scenario: Ubuntu 12.04 server Mac 10.7.4 client shared directory has 775 permissions created files on client have 644 permissions I tried setting ACLs with the setfacl command, as explained here, and it appears they are set on the server. getfacl returns this: # file: Documents/ # owner: someguy # group: somegroup # flags: -s- user::rwx group::rwx other::r-x default:user::rwx default:group::rwx default:group:somegroup:rwx default:mask::rwx default:other::r-x However, when I create a new file on the Mac OS client it still has 644 permissions and not the 664 I would expect. Files created on the server have the expected permissions. Files created with another Ubuntu client also have the expected permissions.

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• Moving from Ubuntu desktop to Ubuntu Server via SSH

  - by Daniel Elessedil Kjeserud

  So a little while ago I installed regular Ubuntu for a home server, but that gave me a lot of extra packages. What I should have done was to install Ubuntu Server, since I don't even own a screen to connect to it. Does anybody know of a way to convert my Ubuntu machine to a Ubuntu Server machine in one big swoop? It has to be done over SSH, since I don't have a screen to connect to it, like I said. It's currently running 9.10, about to be upgraded to 10.4.

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• What else is needed to get iptables to log into this file I created?

  - by anthony01

  I want to create the logging of iptables DROP's and intrusion attemps. First, I put --log-prefix "iptables: " at the end of every iptables rules in my iptables rules file. But this doesn't work, as it says there is a syntax error. So where should I put that command? (I would want to have it included in the saved rules file) Secondly, I created a file iptables.conf within /etc/rsyslog.d/, and I put the following inside of it: :msg, startswith, "iptables: " -/var/log/iptables.log & ~ I assume that at this stage, I'm supposed to restart the rsyslog daemon. What else is needed to do what I'm attempting? Thanks a lot

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• Booting Fedora guest VBox on /dev/mapper/vg0-fc17-root

  - by NevilleDNZ

  I already have the following logical volumes: host:/dev/mapper/vg0-fc17-boot (guestOS:/dev/hdb) formatted as ext4 (no partition table) host:/dev/mapper/vg0-fc17-root (guestOS:/dev/hdc) formatted as ext4 (no partition table) Do I have to create the following grub partition to boot a guest VM under VirtualBox? host:/dev/mapper/vg-fc17-mbr (guestOS:/dev/hda) with a partition table and install grub MBR here? Or is there a better way? (Maybe grub on vg0-fc17-boot?)

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• Limit which processes a user can restart with supervisor?

  - by dvcolgan

  I have used supervisor to manage a Gunicorn process running a Django site, though this question could pertain to anything being managed by supervisor. Previously I was the only person managing and using our server, and supervisor just ran as root and I would use sudo to run supervisorctl restart myapp when needed. Now our server has to support multiple users working on different sites, and each project needs to be able to restart their own gunicorn processes without being able to restart other users' processes. I followed this blog post: http://drumcoder.co.uk/blog/2010/nov/24/running-supervisorctl-non-root/ and was able to allow non-root users to use supervisorctl, but now anyone can restart anyone else's processes. From the looks of it, supervisor doesn't have a way of doing per-user access control. Anyone have any ideas on how to allow users to restart only their own processes without root?

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• Segmentation fault on login to mysql

  - by numberwhun

  Hello everyone! I recently did a fresh install of Ubuntu on my laptop (HP dv7, AMD Dual Core with 4 gigs RAM). I am working on installing my development environment and tools and one of the first things I was working on is getting MySQL installed. The following was my configure statement with options: ./configure --prefix=/usr/local/mysql --with-big-tables --with-unix-socket-path=/usr/local/mysql/tmp/mysql.sock --with-named-curses-libs=/lib/libncurses.so.5.7 After I did the make;make install, I did the post configuration such as setting the root password and installing the mysqld daemon in its rightful place. My issue is when I try to log in to mysql to start using it, the following shows what happens: $ mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.1.42 Source distribution Segmentation fault I have searched Google extensively, I have searched through the mysql bugs database and I have yet to find anything that matches my issue. Here is the contents of my my.cnf file, in case you want to see it: $ cat /etc/my.cnf [mysqld] basedir=/usr/local/mysql datadir=/usr/local/mysql socket=/usr/local/mysql/tmp/mysql.sock [mysql.server] user=mysql #basedir=/var/lib [client] socket=/usr/local/mysql/tmp/mysql.sock [mysqld_safe] err-log=/usr/local/mysql/logs/mysqld.log pid-file=/var/run/mysqld/mysqld.pid I am really hoping that someone here can tell me what has gone wrong with my installation as I would really love to know. I welcome and look forward to all responses. Thank you in advance! Best regards, Jeff

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• How to get rid of superuser`s password?

  - by eleonora

  My father put a new superuser password on my laptop, and now i cant access my computer without him putting the password in. I am really helpless. How can i get rid of his superuser control? Can i delete or change the superuser thing? Please help!!!!

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• F3-F5 keys incorrectly behaving as audio keys

  - by obvio171

  I don't know if this is a configuration issue or a hardware issue, but I have a Kinesis Advantage USB keyboard and for some reason the F3-F5 keys aren't responding as they used to. They don't respond to anything and, when I tried using F5 on Emacs, it said <XF86AudioNext> is undefined, so I guess it's a weird mapping problem. Any idea how I could remap them to the original meaning?

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• Webserver: chrooted PHP gives mysql.sock error when attempting to reach mysql

  - by Jon L.

  Hey guys, I've configured an Ubuntu webserver with Nginx + PHP5-FPM. I've created a chrooted environment (using jailkit) that I'm tossing my developers into, from where they can develop their test applications. Chroot jail: /home/jail Nginx and PHP5-FPM run outside the chroot, but are configured to function with websites within the chrooted environment. So far, Nginx and PHP5-FPM are serving up files without issue, except for the following: When attempting to connect to MySQL, we receive this error: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' Now, I believe the issue is due to the non-chrooted php.ini referencing mysqld.sock outside of the chroot environment (it's actually using the MySQL default setting currently). My question is, how can I configure PHP to access MySQL via loopback or similar? (Found that as a suggestion in a google result, but without any instructions) Or if I'm missing some other obvious setting, let me know. If there's an option of creating a hardlink (that would remain available even if mysql is restarted), that would be handy as well.

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• Improving TCP performance over a gigabit network with lots of connections and high traffic of small packets

  - by MinimeDJ

  I’m trying to improve my TCP throughput over a “gigabit network with lots of connections and high traffic of small packets”. My server OS is Ubuntu 11.10 Server 64bit. There are about 50.000 (and growing) clients connected to my server through TCP Sockets (all on the same port). 95% of of my packets have size of 1-150 bytes (TCP header and payload). The rest 5% vary from 150 up to 4096+ bytes. With the config below my server can handle traffic up to 30 Mbps (full duplex). Can you please advice best practice to tune OS for my needs? My /etc/sysctl.cong looks like this: kernel.pid_max = 1000000 net.ipv4.ip_local_port_range = 2500 65000 fs.file-max = 1000000 # net.core.netdev_max_backlog=3000 net.ipv4.tcp_sack=0 # net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.somaxconn = 2048 # net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 # net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_mem = 50576 64768 98152 # net.core.wmem_default = 65536 net.core.rmem_default = 65536 net.ipv4.tcp_window_scaling=1 # net.ipv4.tcp_mem= 98304 131072 196608 # net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_rfc1337 = 1 net.ipv4.ip_forward = 0 net.ipv4.tcp_congestion_control=cubic net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_tw_reuse = 0 # net.ipv4.tcp_orphan_retries = 1 net.ipv4.tcp_fin_timeout = 25 net.ipv4.tcp_max_orphans = 8192 Here are my limits: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 193045 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1000000 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 1000000 [ADDED] My NICs are the following: $ dmesg | grep Broad [ 2.473081] Broadcom NetXtreme II 5771x 10Gigabit Ethernet Driver bnx2x 1.62.12-0 (2011/03/20) [ 2.477808] bnx2x 0000:02:00.0: eth0: Broadcom NetXtreme II BCM57711E XGb (A0) PCI-E x4 5GHz (Gen2) found at mem fb000000, IRQ 28, node addr d8:d3:85:bd:23:08 [ 2.482556] bnx2x 0000:02:00.1: eth1: Broadcom NetXtreme II BCM57711E XGb (A0) PCI-E x4 5GHz (Gen2) found at mem fa000000, IRQ 40, node addr d8:d3:85:bd:23:0c [ADDED 2] ethtool -k eth0 Offload parameters for eth0: rx-checksumming: on tx-checksumming: on scatter-gather: on tcp-segmentation-offload: on udp-fragmentation-offload: off generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: on rx-vlan-offload: on tx-vlan-offload: on ntuple-filters: off receive-hashing: off [ADDED 3] sudo ethtool -S eth0|grep -vw 0 NIC statistics: [1]: rx_bytes: 17521104292 [1]: rx_ucast_packets: 118326392 [1]: tx_bytes: 35351475694 [1]: tx_ucast_packets: 191723897 [2]: rx_bytes: 16569945203 [2]: rx_ucast_packets: 114055437 [2]: tx_bytes: 36748975961 [2]: tx_ucast_packets: 194800859 [3]: rx_bytes: 16222309010 [3]: rx_ucast_packets: 109397802 [3]: tx_bytes: 36034786682 [3]: tx_ucast_packets: 198238209 [4]: rx_bytes: 14884911384 [4]: rx_ucast_packets: 104081414 [4]: rx_discards: 5828 [4]: rx_csum_offload_errors: 1 [4]: tx_bytes: 35663361789 [4]: tx_ucast_packets: 194024824 [5]: rx_bytes: 16465075461 [5]: rx_ucast_packets: 110637200 [5]: tx_bytes: 43720432434 [5]: tx_ucast_packets: 202041894 [6]: rx_bytes: 16788706505 [6]: rx_ucast_packets: 113123182 [6]: tx_bytes: 38443961940 [6]: tx_ucast_packets: 202415075 [7]: rx_bytes: 16287423304 [7]: rx_ucast_packets: 110369475 [7]: rx_csum_offload_errors: 1 [7]: tx_bytes: 35104168638 [7]: tx_ucast_packets: 184905201 [8]: rx_bytes: 12689721791 [8]: rx_ucast_packets: 87616037 [8]: rx_discards: 2638 [8]: tx_bytes: 36133395431 [8]: tx_ucast_packets: 196547264 [9]: rx_bytes: 15007548011 [9]: rx_ucast_packets: 98183525 [9]: rx_csum_offload_errors: 1 [9]: tx_bytes: 34871314517 [9]: tx_ucast_packets: 188532637 [9]: tx_mcast_packets: 12 [10]: rx_bytes: 12112044826 [10]: rx_ucast_packets: 84335465 [10]: rx_discards: 2494 [10]: tx_bytes: 36562151913 [10]: tx_ucast_packets: 195658548 [11]: rx_bytes: 12873153712 [11]: rx_ucast_packets: 89305791 [11]: rx_discards: 2990 [11]: tx_bytes: 36348541675 [11]: tx_ucast_packets: 194155226 [12]: rx_bytes: 12768100958 [12]: rx_ucast_packets: 89350917 [12]: rx_discards: 2667 [12]: tx_bytes: 35730240389 [12]: tx_ucast_packets: 192254480 [13]: rx_bytes: 14533227468 [13]: rx_ucast_packets: 98139795 [13]: tx_bytes: 35954232494 [13]: tx_ucast_packets: 194573612 [13]: tx_bcast_packets: 2 [14]: rx_bytes: 13258647069 [14]: rx_ucast_packets: 92856762 [14]: rx_discards: 3509 [14]: rx_csum_offload_errors: 1 [14]: tx_bytes: 35663586641 [14]: tx_ucast_packets: 189661305 rx_bytes: 226125043936 rx_ucast_packets: 1536428109 rx_bcast_packets: 351 rx_discards: 20126 rx_filtered_packets: 8694 rx_csum_offload_errors: 11 tx_bytes: 548442367057 tx_ucast_packets: 2915571846 tx_mcast_packets: 12 tx_bcast_packets: 2 tx_64_byte_packets: 35417154 tx_65_to_127_byte_packets: 2006984660 tx_128_to_255_byte_packets: 373733514 tx_256_to_511_byte_packets: 378121090 tx_512_to_1023_byte_packets: 77643490 tx_1024_to_1522_byte_packets: 43669214 tx_pause_frames: 228 Some info about SACK: When to turn TCP SACK off?

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• What is the meaning of those numbers in the second column after typing "ls -l"?

  - by Nick Dong

  drwxr-xr-x. 2 root root 4096 Jun 29 16:44 db drwxr-xr-x. 2 root root 4096 Jun 29 16:44 djproject -rwxr-xr-x. 1 root root 38 Jun 29 16:44 index.html drwxr-xr-x. 2 root root 4096 Jun 29 16:44 jobs -rwxr-xr-x. 1 root root 252 Jun 29 16:44 manage.py drwxr-xr-x. 3 root root 4096 Jun 29 16:44 templates What is the meaning of those numbers in the second column? Do they have some relation to file and folder permissions? How do I change the numbers?

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• Keeping new Ubuntu installation's /var on separate drive without formatting

  - by tlayton

  I have a server running an older version of Ubuntu and with /var stored on a separate partition on a separate hard drive. I am attempting to update Ubuntu to 10.04, but I still want to store /var on a separate partition and hard drive. However, I don't want to format the drive which currently contains /var, as it has important data. Is there some way to have 10.04 set up the new /var on this separate drive at installation, without formatting the drive and losing the old /var?

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• How can I force a MySQL table to become corrupted?

  - by Rory McCann

  I have written a simple Nagios plugin that calls mysqlcheck (which checks for corrupted tables) and will give a warning if any are corrupt. However none of my tables are corrupt now. So I'm not 100% sure that my plugin is working fine. I have a dev server that's not misson critical. How can I force one (or any) of the tables there to be corrupt so that I can test my nagios alert? For the record the server is Ubuntu Dapper and the mysql is version 5.0

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• Taking a screencast in Backtrack 4

  - by Leboff

  I'm working on a tutorial using Backtrack 4 Live USB, and I would like to take a screencast of what I'm doing (not just screenshots) So far I have tried these application with limited success: -recordmydesktop -xvidcap -wink -istanbul -vlc -vnc2flv Each time I try the resulting files are generally choppy (at best 1 frame per second) and most don't even end up with a clear view of the screen each time. If anyone has suggestions for the screencast I would greatly appreciate it. Thanks, Bryan

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• Failed to start apache Can't open /etc/apache2/envvars

  - by bumperbox

  i have had this problem a couple of times now and i am not sure what is causing it Failed to start apache : .: 45: Can't open /etc/apache2/envvars when i look at a dir listing, i get these question marks next to envvars, does anyone know what that means? os is ubuntu 10 if that helps drwxr-xr-x 7 root root 4096 Jan 29 11:56 . drwxr-xr-x 83 root root 4096 Feb 4 10:34 .. -rw-r--r-- 1 root root 8113 Sep 29 01:52 apache2.conf -rw-r--r-- 1 root root 8027 Oct 3 22:26 apache2.conf.dpkg-old drwxr-xr-x 2 root root 4096 Jan 29 11:56 conf.d ?????????? ? ? ? ? ? envvars -rw-r--r-- 1 root root 0 Oct 3 22:25 httpd.conf ?????????? ? ? ? ? ? magic drwxr-xr-x 2 root root 4096 Jan 29 11:56 mods-available drwxr-xr-x 2 root root 4096 Jan 29 10:18 mods-enabled ?????????? ? ? ? ? ? ports.conf drwxr-xr-x 2 root root 4096 Jan 29 11:56 sites-available drwxr-xr-x 2 root root 4096 Jan 29 11:55 sites-enabled UPDATE Just heard back from the hosting company, they move my VPS to a new hardware node last night, and something at their end wasn't quite right which caused the issue

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• More than 3 seconds "Initial Connection" time (webpagetest.org)

  - by George Tasioulis

  I'm having a weird issue with a vBulletin forum, on a 2? Xeon E5645 w/ 16GB RAM, cPanel and LiteSpeed webserver; It takes too long to start loading... When I tested it with webpagetest.org I saw that for every request there's a 3 second "Initial connection" delay, which I don't know why is happening. Here's a screenshot: CPU Load is between 0.03 and 0.05, I've got several GB of free RAM, practical no I/O activity, and this delay can occur even with only one visitor on the forum. Where do you suggest I start searching? What could be the reason for this kind of delay? I don't think it's the webserver, or the forum because there's another website on the server (total 2 sites) which is WordPress based, and has exactly the same issue with the 3 second initial connection delay. I believe it's OS related, but need a clue on where to start looking. Thanks in advance :)

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• MegaCLI always returns blank output

  - by JamesHannah

  This server is a Dell R200 running Ubuntu 8.04LTS using a LSI SAS1068E raid card supplied from Dell, I suspect that there might be some kind of RAID issue with the hardware raid built into the motherboard, but I can't seem to get MegaCLi to return any useful output: root@81 $ ./MegaCli -AdpAllInfo -aALL root@81 $ ./MegaCli -PDList -aALL root@81 $ The disks work and AFAIK the raid software is installed correctly. I've seen this issue on RedHat issues also in the past. The RAID was initially setup through the BIOS on this server and appears to be functioning fine apart from this.

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