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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How can I get Jenkins to stop listening for remote connections?

I have Jenkins sitting behind Nginx, with Nginx taking care of authentication, but Jenkins is still listening on port 8080 externally, so by accessing the box on port 8080 people can bypass Nginx. ...
15
votes
2answers
7k views

How to start setting up a VPN server for smart phone clients?

I have a Ubuntu Lucid Lynx VM which I've been tinkering with. I want to set up a VPN and I am happy to learn how to do it on my own but the vastness of options makes my head spin, so I'm just looking ...
14
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5answers
3k views

How to remove many (200 000) files?

I must remove 200 000 files (all of them) from a folder, and I don't want to delete the folder itself. using rm, I get an "Argument list too long" error. I've tried to do something with xargs, but ...
14
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8answers
21k views

What is the best place to setup system wide environment variables on Linux?

I just want to setup a system wide environment variable, JAVA_HOME for all users, including root user. Requirements: accessible to normal users accessible to root always loaded, not only for bash ...
14
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8answers
13k views

Should I completely turn off swap for linux webserver?

Recently my friend told me that it is a good idea to turn off swap on linux webservers with enough memory. My server has 12 GB and currently uses 4GB (not counting cache and buffers) under peak load. ...
14
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4answers
4k views

Disable prompts while installing a Debian package

How can i disable totally the prompts that appear while installing a Debian package, i've used all the options that i've found but there are some packages that are still prompting. I'm using this ...
14
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4answers
43k views

Deleting All Partitions From the Command Line

How do you delete all partitions on a device from the command line on Linux (specifically Ubuntu)? I tried looking at fdisk, but it presents an interactive prompt. I'm looking for a single command, ...
14
votes
4answers
24k views

How to run script via SSH that doesn't end when I close connection?

I need to run script, that takes long time to execute, or I just want it to run forever. I can't just SSH to my machine, because when I disconnect it stops running. Is there any way to run script ...
14
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2answers
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Linux e1000e (Intel networking driver) problems galore, where do I start?

I'm currently having a major problem with e1000e (not working at all) in Ubuntu Maverick (1.0.2-k4), after resume I'm getting a lot of stuff in dmesg: [ 9085.820197] e1000e 0000:02:00.0: PCI INT A ...
14
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4answers
2k views

How do limit disc i/o during backup?

I have a cron that basically do a simple "tar zcf" in the night. The server has: 8 Cores - Intel(R) Xeon(R) CPU E5606 @ 2.13GHz 25GB RAM Ubuntu 12.04.2 LTS Hardware RAID 1 (LSI Logic / Symbios ...
14
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6answers
3k views

How to grant temporary access to server?

I've hired a remote consultant to tune up my servers. Now, I am not 100% confident about giving him root password and allow him to do whatever he wants to do on the servers. Ideally, I want to see ...
14
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4answers
11k views

What is vmlinuz and why do I care?

I just got a network alert that I've never seen before, on one of the few Ubuntu boxes that we have: The following monitoring trigger has been fired: /vmlinuz has been changed on server XXXXX: ...
14
votes
3answers
16k views

Do I need to refresh or restart anything after I add/update a crontab in Ubuntu Server 8.04?

When you change something in Apache you need to reload or restart apache. Does anything need to be refreshed or restarted in Ubuntu Server 8.04 after I add/update the crontab? Thanks a bunch for your ...
14
votes
3answers
507 views

Putting /etc under source control

I would like to put my /etc directory iunder source control using bazaar. Are there any gotchas in doing this. It seems safer to do it user an ordinary user rather than root - might there a be a ...
14
votes
3answers
9k views

Set up sftp to use password but ssh not to use password

Is it possible to set up a user on ubuntu with openssh so that ssh does not use password authentication but sftp does? I assume that if I change /etc/ssh/ssh_config to have PasswordAuthentication yes ...
14
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6answers
37k views

Checkpoint VPN Linux Client

Is there a Linux client for Checkpoint VPN? Preferably for Ubuntu?
14
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1answer
12k views

“There is 1 zombie process”

This message appears when I login to my machine... There is 1 zombie process. What is it telling me? Is this anything I should worry about? If yes, then what should I do, and how?
14
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8answers
29k views

Command line program to test DHCP service

Is there a simple ping-like command to test whether a DHCP service is running on a network? ...on Linux
14
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1answer
11k 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). ...
13
votes
3answers
533 views

Which method to use for granting sudo

What is the difference between adding a user to /etc/sudoers and usermod -a -G sudo? Which method should be used for granting sudo?
13
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3answers
12k views

Can't create symlinks in virtualbox shared folders [closed]

A few days ago I found I can no longer create symlinks from Ubuntu in any directories that are shared with the OS X host. ln: creating symbolic link `foo': Read-only file system I'm able to create ...
13
votes
4answers
20k views

Failed tls handshake. Does not contain any IP SANs

I'm trying to set up logstash forwarder, but I have issues with making a proper secure channel. Trying to configure this with two ubuntu (server 14.04) machines running in virtualbox. They are 100% ...
13
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5answers
3k views

Fixing services that have been disabled in /etc/default/ with puppet?

I'm using puppet to (theoretically) get npcd to start upon installation, however on Ubuntu, that service comes installed with the default setting in /etc/default/npcd of RUN="no": $ cat ...
13
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4answers
11k views

How do you swap the caps lock to control in xfce?

I used to have the caps lock and control swapped in GNOME, but when I upgraded to Ubuntu 9.04 I also changed my desktop environment to Xfce. I have the following line in my xorg.conf: Option ...
13
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2answers
20k views

How to divert traffic based on hostname using HAProxy?

I've had some initial success with HAProxy setting up a bunch of app servers listening on various other ports. I now have another webserver listening on one port, and i'd like to what changes to make ...
13
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3answers
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Ubuntu 10.04/CURL: How do I fix/update the CA Bundle?

I recently upgraded our server from 8.04 to 10.04, and all the software along with it. From what I've found online, it seems that the new version of CURL doesn't include a CA bundle, and, as a ...
13
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2answers
16k views

Installing imagick PHP extension on Ubuntu

I'm trying to install the imagick pecl extension on my Ubuntu server and am getting the below error. I've installed the ImageMagick rpm using aptitude already and the pecl extension is version 2.3.0. ...
13
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5answers
22k views

Apache: SSLCertificateKeyFile: file does not exist or is empty

I am configuring SSL for Apache 2. My system is Ubuntu Server 10.04 LTS. I have the following settings related to SSL in my vhost configuration: SSLEngine On SSLCertificateKeyFile ...
13
votes
5answers
13k 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, ...
13
votes
4answers
57k views

How to fix “BUG: soft lockup - CPU#0 stuck for 17163091968s”?

UPDATE: I updated the title of the message, because I've recently seen more of these problems with this exact time amount of 17163091968s. This should help people investigating the symptoms to find ...
13
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5answers
147 views

ubuntu servers - what do i need to do to keep it uptodate

I am setting up an ubuntu server and want to know what I should be doing on it regularly. apt-get update/upgrade seems obvious. Is there a glsa check for example? Anything else I should be running? ...
13
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2answers
2k views

Weird syslog order

Have you ever seen wrong order in /var/log/syslog ? I think that it causes only crontab. Jun 28 22:20:01 alex CRON[2327]: (root) CMD (something > /dev/null) Jun 28 22:21:01 alex CRON[2700]: (root) ...
13
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3answers
38k views

Run nginx as a non-root user

I followed this process to installing nginx on my Ubuntu 10.04 Lucid Server http://library.linode.com/web-servers/nginx/installation/ubuntu-10.04-lucid I got lost after the point of creating an init ...
13
votes
3answers
4k views

NFS with encrypted ubuntu home directory

I am having trouble getting NFS setup on with vagrant: On my local machine I have installed NFS: apt-get install nfs-common nfs-kernel-server And in my Vagrantfile set it to be used: ...
13
votes
3answers
793 views

SSH session never closes when executing “apt-get install”

Problem When running apt-get install in an non-interactive SSH session, the session never closes. Example: ssh user@target "sudo apt-get -y install my_package" The my_package does get installed ...
13
votes
4answers
15k views

How can I configure a private (friends only) IRC Server?

I am trying to setup an IRC server on my machine for a bunch of friends and me to use. This is an ubuntu box and I have installed dancer-ircd and dancer-services and gotten everything up and running ...
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 ...
12
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3answers
72k views

How do I cleanly remove apache2 server on ubuntu server and then reinstall?

I am having some wierd issues with Apache2 server on my ubuntu server. I believe some configuration files may have been tampered with. What is the easiest way to remove apache2 completely from my ...
12
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11answers
8k views

Any way to run Linux as a Virtual Machine on top of Windows so can have best of both worlds?

Since Linux has a lot of useful tools, while Windows has a lot of apps (like Chrome), instead of buying another machine to run Linux, is there a way to run it as a Virtual Machine on the PC? The ...
12
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3answers
3k views

How to make folders 00-99 with a single command in Ubuntu?

I need to create folders starting from 00 to 99 (00, 01, 02, 03, etc....) in several hundred places. Is there a single line command that will let me do that?
12
votes
3answers
879 views

grep behaving differently on Fedora vs Ubuntu

So when I run this in Fedora I'm seeing this: $ ls hmm_data/indivA12_AATAAG/refs/par1/ 2R-orths.alleles 2R-ref.alleles $ ls hmm_data/indivA12_AATAAG/refs/par1/ | grep -F '-ref.alleles' ...
12
votes
2answers
19k views

Turning off cp (copy) command's interactive mode (cp : overwrite ?)

Does anyone know how I would turn off the interactive mode when using cp? I am trying to copy a directory recursively into another and for each file that is getting overwritten I have to answer 'y'. ...
12
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4answers
13k views

How do I get apt-get to reinstall a package and run the set up scripts?

So I installed mailutils (apt-get install mailutils) and when I did a nice little setup screen popped up and started asking me questions. I guess I screwed up and cancelled out before I had all the ...
12
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4answers
6k views

Ubuntu's garbage collection cron job for PHP sessions takes 25 minutes to run, why?

Ubuntu has a cron job set up which looks for and deletes old PHP sessions: # Look for and purge old sessions every 30 minutes 09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] \ ...
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2answers
2k views

ubuntu 10.10 sshd contains “YOU WANNA SMOKE A SPLIFF” and pot leaf ascii art. Does this mean I've been hacked?

My sshd binary on an ubuntu 10.10 machine contains the following ascii artwork: ng: %.100sToo many lines in environment file %sUser %.100s not allowed because %s exists YOU WANNA . ...
12
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11answers
9k views

What creates CPU I/O wait but no disk operations?

I have CPU I/O wait steady around 50%, but when I run iostat 1 it shows little to no disk activity. What causes wait without iops? NOTE: There no NFS or FUSE filesystems here, but it is using Xen ...
12
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2answers
42k views

Install php extensions on ubuntu

I have a Ubuntu 9.10 server. I have installed apache2 and php5 using the apt-get commands. How does one install php extensions? Are there commands like apt-get to get them? Or should I manually look ...
12
votes
1answer
9k views

Where are the logs for ufw located on Ubuntu Server?

I have an Ubuntu server where I am blocking some IPs with ufw. I enabled logging, but I don't know where to find the logs. Where might the logs be or why might ufw not be logging?
12
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4answers
9k views

How to tell which Ubuntu package a tool is in

As a concrete example I want to be able to take a particular tool that isn't installed (say nslookup) and be able to tell which package I need to install when the following fails: apt-get install ...
12
votes
10answers
28k views

How do I make sphinx restart when I reboot my Ubuntu server?

I built and installed sphinx search on my ubuntu 9.04 server. How do I make the sphinx daemon start automatically when I reboot?