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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1answer
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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 /home/...
0
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2answers
265 views

PHP scripts time out but regular pages are snappy

I'm having a strange issue with nginx and PHP-FPM. I have a server set up to serve downloads for my website. It's not very beasty, it's only a Celeron G530 and 4GB of RAM, because of this, I'm running ...
51
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8answers
53k views

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 ...
28
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7answers
98k views

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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3answers
21k views

How can I check /dev/xvda1?

On login to EC2 (Ubuntu) instance, I see *** /dev/xvda1 should be checked for errors *** I can't fsck /dev/xvda1 because it is mounted, and sudo umount /dev/xvda1 fails because it is in use. lsof ...
24
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4answers
32k views

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 ...
41
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9answers
76k views

How do I get apt-get to ignore some dependencies?

How do I make apt-get ignore some dependencies? For example, I wanted to install mailx so I can use it to send email from cron scripts/report-generating tools. However, installing mailx also installs ...
10
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1answer
26k views

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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6answers
32k 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 ...
15
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6answers
38k views

Checkpoint VPN Linux Client

Is there a Linux client for Checkpoint VPN? Preferably for Ubuntu?
13
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5answers
14k views

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, ...
10
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3answers
10k views

How to redirect all outgoing email from postfix to a single address for testing

I am setting up a testing server for a web based application that sends some email notifications. Sometimes testing is performed with real customer data, and for that reason I need to guarantee that ...
9
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2answers
8k 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. ...
38
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5answers
38k views

Ubuntu Apache: httpd.conf or apache2.conf?

which one of these two files should I use to configure Apache? The httpd.conf is empty, while apache2.conf is not. It confuses me!
8
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2answers
22k views

Node.js is not accessible from external IPs on Ubuntu

Hey everyone, I'm sure this is very noobish, so forgive me. I'm trying to run a node.js server on port 8080 of my ubuntu 10.04. Here's the result of iptables -L on the server: Chain INPUT (policy ...
12
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20answers
1k views

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 workstations-turned-...
11
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4answers
7k views

`sudo echo “bla” >> /etc/sysctl.conf` permission denied

Disclaimer: I'm pretty novice at sysadmin stuff. I'm trying to set up port forwarding in an AWS EC2 instance, this has to be done in the command-line because I don't want to go in and edit anything, ...
9
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5answers
5k views

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 ...
6
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13answers
7k views

Ubuntu server 9.10 freezes up after ~10 minutes

I just upgraded my Ubuntu server from 9.04 to 9.10 and after about 10 minutes it locks up. It won't respond to ping, can't ssh in and the terminal doesn't accept keyboard input. It does not have X ...
3
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1answer
2k views

Limit/Throttle per user OpenVPN bandwidth using TC

I have a group of users connecting to my server via OpenVPN TCP and UDP (2 services). The two services are operating on tun0 and tun1 I'd like to be able to limit each user's bandwidth to say 5mb/s ...
23
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5answers
61k views

Unknown/unsupported storage engine: InnoDB | MySQL Ubuntu

I recently upgraded from the previous LTS Ubuntu to Precise and now mysql refuses to start. It complains of the following when I attempt to start it: ╰$ sudo service mysql restart stop: Unknown ...
11
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1answer
24k 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 ...
8
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3answers
8k 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 ...
8
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2answers
2k views

Prevent the possiblity of writing data to an unmounted mount point directory [duplicate]

I have an Ubuntu server where I'm automounting an external hard drive each boot. To do this, I've created an empty folder on the root partition, and the drive gets mounted "inside" this folder. ...
6
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4answers
13k views

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 ...
4
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1answer
5k 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 ...
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3answers
14k views

how to restrict ssh login to a specific ip or host

i want to restrict my ssh login only for one ip address so i modified the following file $ nano /etc/ssh/sshd_config and added this line (i.e. my ip ) hoping that it will work ListenAddress ...
2
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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 ...
15
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3answers
49k 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
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1answer
1k 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 ALL=...
10
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3answers
6k views

nginx logging to access.log.1 instead of access.log, logrotate failing?

I have an nginx instance that is set to log access to /var/log/nginx/access.log and errors to /var/log/nginx/errors.log, but as soon as logrotate runs each week, the file gets moves to *.log.1 and the ...
5
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1answer
4k views

ZFS on Linux/Ubuntu: Help importing a zpool after Ubuntu upgrade from 13.04 to 13.10, device IDs have changed

I have updated Ubuntu from version 13.04 to version 13.10, only to discover that the SATA disks IDs have changed, and my ZFS pool now fails. On new Ubuntu 13.10 the disk IDs are now ata-* instead of ...
5
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8answers
7k views

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# ...
5
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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 ...
5
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3answers
7k views

Bash prompt on Ubuntu - FQDN (\H) same as hostname (\h)

We've got seperate environments at my workplace for development, testing, integration, and staging. Within those envs, we've overloaded the hostnames in DNS - e.g. in the dev environment, the primary ...
4
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4answers
20k views

Ubuntu 14.04 System Logging

I've set up an Ubuntu 14.04 Server (from an Ubuntu 12.04 Server) but today I wanted to look in the auth.log but this file is not used. It seems that ´syslog´ was deleted. How does Ubuntu 14.04 log? I ...
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: http://packages.ubuntu.com/jaunty/...
12
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1answer
8k 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 ...
9
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2answers
2k views

Where does Ubuntu store partition UUIDs on disk?

Exactly what part of the disk is a UUID stored on? MBR? Somewhere within the partition? Is it a calculated value, or randomly generated and recorded?
8
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5answers
5k views

Ubuntu : borked my sudoers file, how can I fix it?

I was editing my /etc/sudoers file and saved it but it has a syntax error in there. Now I can't 'sudo vim /etc/sudoers' because sudo thinks the sudoers file is not valid. How can I fix this?
6
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4answers
7k views

ssh_exchange_identification: Connection closed by remote host

Firstly, I know that this question has been asked a million times, and I have read everything I can find and still cannot fix the problem. i am encountering this issue when ssh'ing in from my mac to ...
6
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4answers
18k views

Running lsof -i shows a lot of connections in CLOSE_WAIT ? Should I worry

So I am running lsof -i | wc -l periodically and it is telling me that out of 420 lines, between 240 and 255 are in CLOSE_WAIT state. How does TCP connections enter this state ? Should I be worried ...
6
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2answers
15k views

L2TP client for Ubuntu

It's easy enough to get a pptp client going on a Ubuntu 9.04 (Jaunty) desktop: sudo apt-get install network-manager-pptp However, I can't seem to find documentation find a corresponding L2TP ...
6
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5answers
18k views

ubuntu: let a user run a script with root permissions

I have ubuntu 8.04 and I want to write a bash script that runs as root which every user can run. I myself can do sudo. How do I do that? CLARIFICATION: I don't want to do it with sudo, because then ...
5
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4answers
2k views

Prevent SSH connection lost after logging into VPN on server machine

I encountered an issue that I can't deal with. When I'm logged onto an VPS over SSH and try to estabilish VPN connection on that VPS, the SSH connection between VPS and my machine get lost. I assume ...
5
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4answers
3k views

ubuntu - how can I avoid typing a password on every admin action?

I just set-up ubuntu 9.10 on my computer, and I'm trying to figure out how to avoid typing a password on every action that requires sudo privileges. I just want to type a password once on login and ...
3
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1answer
2k views

stunnel: SSL-to-SSL? (for smtp/imap)

How can I configure stunnel to accpet SSL connections, and connect then to an SSL port on a different server? Here is my setup: Our ISP's server, "Mail Server", supports smtp/imap over SSL. (Not ...
3
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3answers
14k views

How to disable “sender non-delivery notification” in postfix?

I want postfix to stop sending non-delivery notifications to my local account, here is example from my log 17:47:08 A727B62C6F61: message-id=<20121124174708.A727B62C6F61@mail.***********> 17:...
2
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3answers
4k views

(How) can I use syslog to diagnose mysterious crashes?

I run a LAMP stack on Ubuntu server. Twice today it has ground to a halt and required a hard reboot. Prior to this it had been stable for many months. It has been about a fortnight since the last ...
2
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1answer
4k views

ive got dkim=neutral (bad version) header.i with gmail and dkim=fail (unknown key type) with yahoo

I'm having external ip and ubuntu server with exim4.71 and bind9. I'm trying to set valid dkim entry to send mail for gmail Here are my configuration files: bind9: _domainkey.example.com. IN ...