Ubuntu Linux is a Debian derivative that aims to bring Linux mainstream. Questions on this site should generally refer to Ubuntu Server. Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.

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Ubuntu installation can't detect hard drives

I'm installing Ubuntu onto a HP Proliant DL360 G7 server, which has a hardware Smart Array RAID controller that is not compatible with Ubuntu. HP say the RAID controller needs to be disabled in the ...
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1answer
6k views

open file descriptor limits.conf setting isn't read by ulimit even when pam_limits.so is required

I am trying to raise the open file descriptor maximum for all users on an ubuntu machine. I've added the following lines to /etc/security/limits.conf: * soft nofile 100000 ...
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5answers
2k views

MySQL stopped working - full disk

Maybe it is because I am lacking in free disk space, take a look: Filesystem Size Used Avail Use% Mounted on /dev/sda2 1.9G 208M 1.6G 12% / none 998M 192K ...
4
votes
1answer
744 views

Undoing chmod 777

Sometimes in desperation, to test if my problem is not the permission problem I do: sudo chmod -R 777 mydir/ In most cases it does not helps, and now I have two problems ;) Files inside mydir/ had ...
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2answers
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Upgrading Ubuntu Server

I tried to upgrade my Ubuntu Server following these instructions: http://www.ubuntu.com/desktop/get-ubuntu/upgrade But the command do-release-upgrade (as root) brings me: Checking for a new ubuntu ...
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2answers
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root directory permissions changed to 777 by mistake whats now?

By Mistake on Ubuntu 9.04 my colleague has changed the permissions to 777 on root directory (/) whats the best way to recover the permissions ?
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3answers
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Serial port forwarding over TCP/IP (linux server)

I am looking for a way to use a remote serial port on a linux machine over LAN. The machine is running ubuntu 10.04 and I have a arduino board connected to it, that I would like to be able to ...
0
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1answer
1k views

Trouble getting Tomcat to start up during install

I installed Java and now added Tomcat. I configured Tomcat, but it is not running. What I did was add the line: export JAVA_HOME=/usr/lib/jvm/java-6-sun as the first non-comment line in the ...
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3answers
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Bash piping answer in Ubuntu

In a bash script, I want to know know how to pipe in answers like for example: ssh -l username -i /home/ubuntu/.ssh/id host.com < yes The ssh connection would ask if I would like to continue the ...
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6answers
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add new user with root access in Linux

I want to add new user and have/grant that new user to have all the root access, how can I do that ? I did sudo adduser --system testuser but this is not working as I expected. Thanks for help.
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7answers
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What is the debian-sys-maint MySQL user (and more)?

I have been bitten several times by the 'debian-sys-maint' user that is installed by default on the mysql-server packages installed from the Ubuntu repositories. Generally what happens is I pull a ...
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3answers
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Forwarding ports to guests in libvirt / KVM

How can I forward ports on a server running libvirt/KVM to specified ports on VM's, when using NAT? For example, the host has a public IP of 1.2.3.4. I want to forward port 80 to 10.0.0.1 and port 22 ...
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1answer
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how do I get nginx to forward HTTP POST requests via rewrite?

My iOS app is currently accessing domain A via http POST but I would like to forward all requests to domain B. If I use the usual "rewrite ^/(.*)$ http://mydomain/$1 permanent;" the POST data ...
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4answers
14k views

Booting a native Windows install in Virtualbox: is it possible?

I am looking for something similiar to Bootcamp. Currently, I run Ubuntu Maveric as my primary operating system and run Windows 7 in Virtualbox. For some tasks, however, running Windows virtualized ...
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5answers
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How can I configure unattended installation of Ubuntu?

I'd like to configure an installer for Ubuntu which runs in 'unattended' mode and answers all the questions with defaults or pre-configured settings. Ideally it should run and reboot on it's own, ...
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2answers
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Running linux containers (lxc) on ubuntu to isolate web server processes (ruby/thin)

I am trying to setup a server where I would be running multiple apps. Mostly internal but could also be open source projects like Redmine. They would all be Rails/Ruby apps/test scripts running on ...
4
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1answer
6k views

port to subdomain

I have installed Hudson using apt-get, and the Hudson server is available on example.com:8080. For example.com I use standard port *:80 and some virtual hosts set up this way: # ...
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4answers
15k views

simple postfix configuration - forward all incoming email to single address

I've a Ubuntu 9.04 server installation which is hosting a small number of websites (currently two, and will remain in single figures). The email requirements for the server are very limited - to ...
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2answers
4k views

CPU0 is swamped with eth1 interrupts

I've got an Ubuntu VM, running inside Ubuntu-based Xen XCP. It hosts a custom FCGI-based HTTP service, behind nginx. Under load from ab the first CPU core is saturated, and the rest is under-loaded. ...
13
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4answers
9k views

how to rename a VM using libvirt+KVM

How can I rename a VM on KVM+libvirt? I would like it to change the name in the 'inventory' as well as change the name of the storage etc.
34
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4answers
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ubuntu apache: httpd.conf or apache2.conf?

which one of these 2 files should i use to configure apache? the httpd.conf is empty while apache2.conf is not. it confuses me!
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5answers
15k views

How to fix PuTTY showing garbled characters?

Connecting from a Windows 7 PC via SSH to an Ubuntu server using PuTTY, I get some screen errors: I.e. it: "Double-draws" the selection inside Midnight Commander (MC). Other characters like line ...
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2answers
3k views

How do I setup ssh with both private key and password?

How do I setup ssh with both private key and password? In /etc/ssh/sshd_config, I currently have: RSAAuthentication yes PubkeyAuthentication yes PasswordAuthentication yes But apparently this ...
13
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1answer
7k views

Multiple php versions simultaneously on Ubuntu

I want to be able to run multiple php versions on my development box running Ubuntu 12.04. What I want to accomplish is that when I use localhost as domain a default is used (let's say php 5.3.17). ...
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2answers
25k views

setting up a basic mod_proxy virtual host

I'm trying to set up a basic virtual host to proxy all requests to test.local to a WEBrick server I have running on 127.0.0.1:8080 while keeping all requests to localhost going to my static files in ...
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19answers
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Are there any reasons NOT to run an Ubuntu server?

I'm going to be setting up a network for a small office soon. The network will consist of about 5 workstations (soon to be more) and 2-3 servers (one "real" server and a couple ...
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5answers
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Boot Debian while RAID array is degraded

Recently, I came across Ubuntu Server install. During install, it asked me whether or not to allow booting system from degraded RAID array (probably because I installed system onto RAID1 /dev/md0 ...
9
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8answers
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Ubuntu: Resize the root LVM(2?) partition

I have an Ubuntu virtual machine running in VirtualBox 2.2.4, and I created it on an 8gb virtual disk which is too small. So, I am trying to increase the size of the disk. So far, I have done this: ...
7
votes
3answers
11k views

Iptables - Bridge and Forward chain

I have setup ethernet bridge br0 that contains two interfaces eth0 and tap0 brctl addbr br0 brctl addif eth0 brctl addif tap0 ifconfig eth0 0.0.0.0 promisc up ifconfig tap0 0.0.0.0 promisc up ...
7
votes
3answers
26k views

How do I force specific permissions for new files/folders on Linux file server?

I'm having an issue with my install of Ubuntu 9.10 (file server) and its samba permissions. Logging in and reading works fine. However, creation of new directories by users restricts access for other ...
7
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5answers
3k views

Securely restrict access to a private Debian repository

I was looking for a method to restrict access to a private Debian repository and be able to authenticate to it non-interactively (i.e. using a script) The most useful article I found if actually one ...
7
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5answers
24k views

Disable usage of console-kit-daemon in Ubuntu

I administrate several Ubuntu 9.04 servers, and everytime I log in, I get the Landscape utility printout with server stats, etc. I really don't need this and it slows down my logins considerably. ...
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4answers
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What is Best NAS solution for windows workgroup? freenas or openfiler

we have small network of 15 computer. we want to store data in nas box with raid configured so that it can be accessed by all users. it will be document, excel, pdf and database files. what is best ...
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2answers
4k views

Running multiple versions of PHP on Ubuntu

Is there an easy way to run multiple versions of PHP on Ubuntu 10.04 (desktop), and switching between them? I am spoiled with the very easy installation and switching of PHP in WAMP for Windows. This ...
2
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2answers
4k views

Linux (Ubuntu) run script upon USB mount

I have a Ubuntu server with a external USB hard drive. I basically just want to run a script whenever the hard drive is plugged in. What would be the optimal way to achieve this ?
14
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3answers
42k views

How to setup a MySql server to accept remote connections?

I am installing a MySql server in Ubuntu desktop. I could connect MySql Query Browser to it when specifying the Server Hostname as localhost, but when I replace it by the machine's IP it stops working ...
8
votes
1answer
949 views

Configuring sudo to work without password

I'm trying to configure sudo to allow all users to restart apache without having to enter a password. Security concerns aside, why isn't this working? I added the line to /etc/sudoers: %admin ...
6
votes
2answers
16k views

How to prevent squid from caching and just filter?

I have set a proxy server on my network. I only want to filter the web traffic. So, I have Squid as a proxy and Qlproxy as the filter : http://www.quintolabs.com/qlicap_info.php My server have only ...
6
votes
2answers
10k views

How to change default runlevel of Ubuntu (lucid)?

I have Ubuntu lucid on my home computer. Today I was experimenting with runlevels and I couldn't figure out how to change the default run level of Ubuntu. I can do that using /etc/inittab on Debian ...
4
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2answers
6k views

What are the ramifications of setting tcp_tw_recycle/reuse to 1?

I set both tcp_tw_recycle/reuse to 1 in my configuration file. What are the ramifications of doing this? If a tcp socket is re-used, does that pose a security risk? i.e. 2 different connections both ...
19
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6answers
22k views

protocol version mismatch — is your shell clean?

When following the instructions to do rsync backups given here: http://troy.jdmz.net/rsync/index.html I get the error "protocol version mismatch -- is your shell clean?" I read somewhere that I ...
8
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2answers
4k views

Ubuntu Linux: Process swap memory and memory usage

My Ubuntu eats more memory than the task manager is showing: sudo ps -e --format rss | awk 'BEGIN{c=0} {c+=$1} END{print c/1024}' 2750.29 free -m total used free ...
6
votes
2answers
2k views

How can I install packages without starting their associated services?

As you're probably aware, by default when you install a package on a Debian or Ubuntu based system, if the package contains a service, that service will generally be enabled and started automatically ...
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votes
6answers
24k views

how to auto start openvpn (client) on ubuntu 12.04 cli?

I have an *.ovpn file that works if I type in sudo openvpn client.ovpn Now I would like to start up openvpn when I boot the computer. It's a headless version of ubuntu - if that matters - 12.04 ...
6
votes
5answers
7k views

I just deleted “/bin”. What's the best way to recover?

I just ran (not on purpose!) rm -rf /bin. I've booted down the computer and am using Finnix to try to recover from it. I have succeeded in mounting the drive, and confirmed that, yes, the entire /bin ...
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2answers
3k views

Ubuntu Kickstart installation using LVM waits for input

I have a PXE Boot Setup for installing CentOS 5 and Ubuntu 10.04 via Kickstart. I use LVM and installing CentOS without any user interaction works but Ubuntu always asks to "confirm to write changes ...
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8answers
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Used/blocked ports in Ubuntu

starting up Glassfish AS would tell me the port 4848 is blocked (or any port that I configure). But checking the ports are not used. There is no firewall. root@ubuntu:~/glassfishv3/glassfish/bin# ...
4
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1answer
4k views

PPTP VPN iptables firewall issues csf [closed]

I am having a problem with iptables and a PPTP VPN, I have read related topics both on hear and online but still can't get it to work! I am trying to set up PPTP on an ubuntu server on our local ...
4
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2answers
970 views

How do I install a package from Ubuntu Karmic onto Jaunty?

I'd like to know if the following is easy/possible/recommended. The version of Ubuntu I'm using (jaunty) has an out of date package that I need to upgrade: ...
3
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1answer
3k views

How to create UDP proxy using iptables

I have a server running UDP server on port 50000. This server receives updates from clients, and pings back the clients every 5 seconds to the socket they were connected from. Now I want to redirect ...