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• Configuration Tuning for PostgreSQL 9.1 PostGIS 1.5 Ubuntu 12.04 Server

  - by Martin

  My server performance is poor. At times SSH, top, and other features or commands are very slow to respond, taking several seconds or more. A query that normally takes 5 minutes can sometimes take 30 minutes. The database is mostly being used to do a spatial query (grid and summarize) on approximately 500GB of stored data spread between 4 tables. Restarting the server works as a temporary fix, but cannot be used as a long term solution. Any suggestions for how to diagnose and solve my performance issues? Hardware and Configuration: 3.3 GHz Intel quad core i5 16 GB DDR3 RAM 6 TB software RAID 10 (6 x 2 TB drives) Ubuntu 12.04 64-bit Postgres 9.1 PostGIS 1.5

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• Adding unallocated partition to Ubuntu in VMware

  - by AMS949

  I've installed Ubuntu 9.10 on a Windows XP using vmware. As most do, I initially setup the size of the virtual drive to 8GB and soon realized I need more. I used the VMware utility to expand the virtual drive and added another 4GB, which I can see using GParted. Now my dilemma is how can I "merge" the newly created space to my original? I need to add the unallocated space. I tried before and after formatting the new space but still whenever I try to resize/move /dev/sda1 it looks like it is using its maximum capacity. Also, GParted is being used from the GParted live CD not from the Linux live CD.

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• Limit ftp users to only certain directories in Ubuntu

  - by George

  There are several questions around limiting ftp users to certain directories. However, most of them refer to vsftpd, which I don't think I have installed on my system. I'm running Ubuntu 9.04. How can I tell what ftp service I have installed, and then limit certain users to only the /home/ftpuser directory instead of having full access to the file system? I think I can add them to a separate group and give that group access to the proper directories, but then do I have to remove that groups permissions from all other directories? It seems like there should be an easy way like setting the chroot_local_user value in the /etc/vsftpd/vsftpd.conf file, but that doesn't exist on my system.

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• Ubuntu 12.04 Server: permissions on /var/www for newly copied files

  - by Abe

  I ran the following commands to set up ACL on the /var/www folder in my Ubuntu 12.04 Server: sudo usermod -g www-data abe sudo chown -R www-data:www-data /var/www sudo chmod -R 775 /var/www I downloaded Wordpress using wget in my /var/www folder and unzipped the downloaded file: cd /var/www wget http://wordpress.org/latest.zip mv latest.zip wordpress.zip unzip wordpress.zip I created a new database and user in mysql and attempted to run the setup process through the web interface. When I enter the configuration info in wordpress I run into the following error message: Sorry, but I can't write the wp-config.php file. When I run ls -la, I see that the files are owned by my user abe, but they are part of the group www-data. Would I have to run the chmod command every time I copy new files to /var/www? sudo chmod -R 775 /var/www

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• T61, NVidia, Ubuntu 9.10 == Video problems

  - by David Lazar

  Hi, Upgraded to latest Ubuntu, currently 9.10. Videos used to work fine. Now, playing videos using VLC or any other media player shows them 'sepia' tinged when playing. This is annoying. I remember this used to happen on occasion (after resuming from suspect), and I forget what I fiddled with to make it better. Does anyone have the method to force video to render correctly with this combination? It happens even after a reboot. Thanks

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• Ubuntu VPN Server (PPTPD) Configuration - Pass Traffic to Internet

  - by SnAzBaZ

  I am trying to configure PPTPD on my Ubuntu box to pass all VPN traffic through to it's internet connection, so I essentially want it to work like a Proxy. I think the problem is that no default gateway is being assigned to my PPTP client (Windows 7). I can connect to the VPN fine, I get an IP address and DNS servers but no default gateway. Do I need to configure a specific option to tell the VPN server to forward all traffic it receives down it's eth0 port and out to the internet. Thanks!

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• nvidia twinview in ubuntu with large resolutions not working

  - by knittl

  i bought an external monitor and can't get it to work properly with my laptop screen. my laptop screen has a resolution of 1920x1200 and the new monitor has 1920x1080 when i open nvidia-settings and select the maximum resolution for each of the screen, one screen will always stay blank. if i select a smaller resolution for one of the two it will work. 1920x1200 + 1440x900 = works 1680x1050 + 1920x1080 = works 1920x1200 + 1920x1080 = doesn't work (but that's what i want to have!) my graphics card is an 01:00.0 VGA compatible controller: nVidia Corporation Quadro FX 360M (rev a1) (output from lspci), driver is proprietary nvidia driver, operating system is ubuntu. any help greatly apreciated

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• Map the 'Domain Admins' group into the local Ubuntu 'admin' group

  - by Miquella

  I have configured an Ubuntu 10.04 box to connect to our domain (Windows 2003 R2) using Likewise-Open. All the users can authenticate as expected. However, the domain administrators do not have administrative privileges to the machine. After working at this for a few hours, I've determined what I think may be a solution: if I map the 'Domain Admins' group from the Active Directory into the local 'admin' group, the users should get the appropriate permissions. But I have no idea how to do that. Does this even sound like the correct approach? A similar question was asked on StackOverflow and then migrated here. But it was never answered as it was recommended to be asked here instead. Thanks in advance!

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• new ubuntu server installation - java server not receiving packets

  - by James

  I have developed a Java server which listens for UDP packets which come from mobile devices. At the moment, it works correctly if I run my Server on my windows PC. I can receive and respond to the UDP packets sent from my phone (over 3g, not wifi). However, I am trying to run the Server on a different computer which I found lying around my house. I have basically done a clean install of Ubuntu Server edition, updated it, installed the java run time environment and configured port forwarding to allow connections on the appropriate port. I have also tried to disable the firewall. The problem is, it doesn't appear as if the server is receiving any packets and I've exhausted my brain thinking on how to solve/debug the problem. Can anyone suggest to me what the problem might be? or more likely something I can do to help me find out more information about what is going wrong.

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• Ubuntu server: lost prompt on monitor

  - by Richard

  Hello All, I am running Ubuntu 9.04 server edition. I have a monitor plugged into the box for occasional admin tasks. I pulled out a USB disk (without unmounting) and the screen is now full with this message: Buffer I/O error on device sdc1, logical block 7778778 I can't seem to clear the screen or get a prompt back. Doesn't appear to be registering keyboard strokes. The box is still running fine (I can ssh in from elsewhere and evrything is running as normal). Any ideas on how to clear screen and get my prompt back?

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• Hosting services on ubuntu server VM

  - by Trevor Hartman

  I've got OSX Server running on a macbook, and I'm looking to run an ubuntu server VM on it via Parallels. I'm thinking about hosting all my apache inside linux, and possibly some other services. I'm curious what a viable config would be, having not done this before. I need to do bridged network right? How do I direct web traffic to the VM instead of OSX? Haven't got my head wrapped around how this works yet so any help would be appreciated.

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• No virtual console on ubuntu 12.10

  - by Buzzzz

  When I try to do a ctr-alt f(1-6) in ubuntu 12.10 I only get a black screen with a blinking cursor but no login prompt. Any ideas on what could be wrong? It is a fresh install of 12.10 using a amd radeon 5850 graphics card. i have tried different things in my /etc/default/grub but at the moment I use the following: # If you change this file, run 'update-grub' afterwards to update # /boot/grub/grub.cfg. # For full documentation of the options in this file, see: # info -f grub -n 'Simple configuration' GRUB_DEFAULT=0 #GRUB_HIDDEN_TIMEOUT=0 GRUB_HIDDEN_TIMEOUT_QUIET=true GRUB_TIMEOUT=10 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="quiet splash vga=normal" #GRUB_CMDLINE_LINUX="vga=0x0376" #RUB_CMDLINE_LINUX_DEFAULT="vga=0x014c" #GRUB_CMDLINE_LINUX="vga=0x014c" #GRUB_GFXPAYLOAD_LINUX=1600x1200x24 # Uncomment to enable BadRAM filtering, modify to suit your needs # This works with Linux (no patch required) and with any kernel that obtains # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...) #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef" # Uncomment to disable graphical terminal (grub-pc only) #GRUB_TERMINAL=console

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• ubuntu fails to start

  - by miccaman

  I have a laptop with ubuntu 9.10 which fails to start, and I want to copy the data from it to an external hard disk. I can login in recovery mode command line, but then I cannot mount the external hard drive. (in recovery mode I cannot write to the laptops hard drive) If I boot from an portable USB with mintlinux, I can mount the external harddrive, and copy most of the data from the laptop, however there is a dir which I have no rights to access under /home/user/Documents then I get a permission denied error. Are there any other options?

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• Set up a root server using Ubuntu and Virtualization

  - by Daniel Völkerts

  Hello, I'd like to setup a fresh root server and install a linux based virtualization on it. My thoughts are on: Intel VTs Hardware Ubuntu 9.10 KVM based virt. The access to the root server will only be SSH for Administration. Has anybody done this before, what was your glues discovered in the daily use? My requirements are: very secure, so the root server only has ssh to the dom-0 and minimalistic ports for the guest (e.g. http/s). good monitoring of host/guest (my idea is to using zabbix for it) easy and fast administration (how are the command line tools working for you? cryptiv? high learning curve?) I'm pleased to learn from your suggestions. Regards, Daniel Völkerts

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• Compiling Ubuntu server: "libQtGui.so: undefined reference to png functions" errors

  - by Kowalikus

  I want to compile wkhtmltopdf on Ubuntu Server, but I have a problem with following errors: /usr/lib/libQtGui.so: undefined reference to `png_read_info@PNG12_0' /usr/lib/libQtGui.so: undefined reference to `png_set_gAMA@PNG12_0' /usr/lib/libQtGui.so: undefined reference to `png_set_PLTE@PNG12_0' ... /usr/lib/libQtGui.so: undefined reference to `png_create_info_struct@PNG12_0' /usr/lib/libQtGui.so: undefined reference to `png_set_bgr@PNG12_0' /usr/lib/libQtGui.so: undefined reference to `png_get_valid@PNG12_0' What can I do? in /usr/lib lrwxrwxrwx 1 17 2010-02-17 15:00 libQtGui.so -> libQtGui.so.4.5.2 lrwxrwxrwx 1 17 2010-02-17 14:59 libQtGui.so.4 -> libQtGui.so.4.5.2 lrwxrwxrwx 1 17 2010-02-17 14:59 libQtGui.so.4.5 -> libQtGui.so.4.5.2 -rw-r--r-- 1 10071604 2009-10-14 23:34 libQtGui.so.4.5.2

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• How do I clone an Ubuntu server under VMWare

  - by dave

  I have a Ubuntu 12.04 server running under VMWare. As best as I can tell, the VMWare vmbk file has been corrupted. The server is operating normally, but this is preventing backups (using Veeam). To remedy this, I'd like to create a duplicate VM without the corruption issue. However, with the corrupted file VMWare can't help me, eg. create a simple clone. I can create a new VM. How do I clone the configuration / data from my problematic server into the new one? Updated: just to clarify: I realise I can't use the VMWare clone tools. I will manually create a new VM (with a base O/S if necessary). How to I replicate the O/S and data from one VM into another?

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• Ubuntu 10.10: getting appropiate monitor resolution for lcd hdtv

  - by lurscher

  I'm running Ubuntu 10.10 x86_64 version, with Nvidia 9800 GT, installed 270.41.06 Nvidia drivers following this guide. I have a LG42LH30FR LCD TV connected with the dvi link - RGB PC input I'm able to get 1024x768 resolution without overscan (I can get 1080i = 1366x768 but there is a lot of hidden screen space to the right and I don't know what to do about it). I want to get full HD I can get full HD (1080p = 1920x1080) on Windows XP 64-bit with custom resolution created with Nvidia Control Panel, from reading over xorg.conf configurations it seems I need to add a certain modeling to the monitor configuration, but I don't know where to get the appropriate options for this task any suggestions?

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• Setting a wireless access point on Ubuntu server 11.10

  - by Solignis

  I am trying to setup a wifi access point with my Ubuntu server. I have managed to get my phone to connect the wireless and now it get a DHCP lease. Though it still cannot ping out or get pinged by anything on my network. I am prety sure my problem is iptables, but I not sure what would be wrong. Here is what my rules look like. (The ones pertaining to the bridge interface) # Allow traffic to / from wireless bridge interface iptables -A INPUT -i br0 -j ACCEPT iptables -A OUTPUT -o br0 -j ACCEPT I am guessing my rules are a little lean, the bridge exists on the same subnet as everything else on my network, I am using a 10.0.0.0/24 subnet. EDIT Oh yeah I should mention also, when I do a ping test, I get Destination Host Unreachable as the error.

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• Configuring Nagios BGP plugin on Ubuntu

  - by user141610

  I am trying to configure nagios check_bgp_neighbors plug-in on Ubuntu and followed README file of check_bgp_neighbors plug-in. I have made following changes: define command{ command_name check_bgp_all command_line $USER1$/check_bgp_neighbors -H $HOSTADDRESS$ -C $USER3$ -n $ARG1$ -n $ARG2$ } to define command{ command_name check_bgp_all command_line /usr/local/nagios/libexec/check_bgp_neighbors.sh -H xx.xx.xx.49 -C xx.xx.xx.50 And define service{ use server-service hostgroup_name svc-bgp1 service_description BGP Check 1 check_command check_bgp_all!10.0.0.1!172.16.0.2 } to define service{ use generic-service hostgroup_name svc-bgp1 service_description BGP Check 1 check_command check_bgp_all!xx.xx.xx.50 } xx.xx.xx.49 is the IP of the host router and xx.xx.xx.50 is the IP of eBGP neighbour. After that it shows critical status. I know my command is not correct but cannot detect the problem. I learned that in this plug-in user-name and password of the host router are required but don't know how and where to provide it. Nagios log does not show any error message. Status information: Failed: status:0 prefixes:0 sent:0 received:0

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• Change permission to /proc/net/ip_conntrack on Ubuntu server 9.10

  - by bjarkef

  Hi I have a script that needs to extract certain information form the /proc/net/ip_conntrack file once in a while. I do not wish to run this script as the root user. Default permissions for the file is: $ ls -lah /proc/net/ip_conntrack -r--r----- 1 root root 0 2010-03-28 12:18 /proc/net/ip_conntrack I can change it with: sudo chmod o+r /proc/net/ip_conntrack But that does not stick after a reboot. Is there some configuration file for file-permissions in the /proc directory in Ubuntu Server 9.10? Or do I just have to stick a chmod line in some startup script?

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• Font size of emacs in ubuntu

  - by Ispinfx

  I use emacs in ubuntu and I use Monaco 10 as its default font. However, the font rendering seems a bit odd compared to my gnome terminal with the same font size: It's a bit smaller and not as clear as that in the terminal. I've tried to avoid simply this with size 11 but it's too large for me. How can I make it the same as its look in the terminal ? Any help is appreciated :) UPDATE: I should tell you the above on is GUI emacs running a shell, and the below is the gnome terminal. On the right are their correspond font settings. Both 100% capture with font size 10: (left: emacs, middle: terminal, right: gedit) One more (gvim's):

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• Cannot enable cron logs on Ubuntu 10.04

  - by Patrick

  I've just the following commands on Ubuntu 10.04 in order to enable cron logs. But I still don't see the file /var/logs/cron. 1. Edit /etc/syslog.conf and uncomment the line starting with cron.* 2. sudo /etc/init.d/sysklogd restart 3. sudo /etc/init.d/cron restart (I've also tried sudo service cron restart). What am i missing to do ? Also, I would like to know how can I run cron manually and not just start the service. thanks

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• Mount encrypted hfs in ubuntu

  - by pagid

  I try to mount an encrypted hfs+ partition in ubuntu. An older post described quite good how to do it, but lacks the information how to use encrypted partitions. What I found so far is: # install required packages sudo apt-get install hfsprogs hfsutils hfsplus loop-aes-utils # try to mount it mount -t hfsplus -o encryption=aes-256 /dev/xyz /mount/xyz But once I run this I get the following error: Error: Password must be at least 20 characters. So I tried to type it in twice, but that results in this: ioctl: LOOP_SET_STATUS: Invalid argument, requested cipher or key (256 bits) not supported by kernel Any suggestions? Thx Edit: One thing I'm not sure about is whether I use the right password. My assumption is that it is my default one for these situations. But I'm not sure whether Max OSX choose another password (internally) for that.

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• Ubuntu make symbolic link between new folder in Home to existing folder

  - by Fath

  Hello, To the point. I have Ubuntu Maverick running on my Lenovo G450. Before, it was Windows 7. All my data are inside another partition, its NTFS. FSTAB line to mount that partition : /dev/sda5 /data ntfs auto,users,uid=1000,gid=1000,utf8,dmask=027,fmask=137 0 0 Inside /data there are folder Musics, Graphics, Tools, Cores, etc. If I'm about to create new folder, let see, GFX on /home/apronouva/GFX and make it link or pointing to /data/Graphics, how do I do that ? So when I open /home/apronouva/GFX the content will be the same as inside /data/Graphics .. and whatever changes I made inside GFX, it will also affect /data/Graphics I tried : $ ln -s /data/Graphics /home/apronouva/GFX it resulted : error, cannot make symbolic link between folder Thanks in advance, Fath

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• Ubuntu 12.04 host lookups extremely slow

  - by tubaguy50035

  I'm having issues with one of my servers taking a long time to look up host names. This is an Ubuntu 12.04 box, so I've tried following the new resolvconf directives. In my /etc/network/interfaces file, I defined my name servers like this: auto eth0 iface eth0 inet static address someaddress netmask 255.255.255.0 gateway 198.58.103.1 dns-nameservers 74.14.179.5 72.14.188.5 In my /etc/resolv.conf, I see these name servers, like this: # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 74.14.179.5 nameserver 72.14.188.5 On another box, I edited the resolv.conf directly as directed by my hosts' setup help files. It looks like this: domain members.linode.com search members.linode.com nameserver 72.14.179.5 nameserver 72.14.188.5 options rotate This second box has no issues with host name look ups and responds quite quickly. Could not having the domain and search directives make my look ups slow? By slow, I mean it's taking anywhere from 5 to 15 seconds to find the IP address of a host.

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