Posts Categorized: linux

Disk Space Usage on Linux

CBS.log Disk Usage Analyzer

An example of narrowing down disk space usage issues on Linux. Starting with the following command: df -h We see that the root volume has 16% space left. Filesystem            Size  Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 129G  103G   20G  84% / cd / We need to run the du command but I wanted to exclude… Read more »

ntopng on CentOS 6


Ensure you have the EPEL repository installed first then do the following to add a repository for ntopng: vi /etc/yum.repos.d/ntop.repo Add the following (the deri bit at the end below is not cut off – it works): [ntop] name=ntop packages baseurl=$releasever/$basearch/ enabled=1 gpgcheck=1 gpgkey= Install ntopng and dependencies: yum install pfring n2disk nProbe ntopng ntopng-data… Read more »

Installing Munin 2.x on Centos 6

Ensure you have the epel repository installed then: yum install –disablerepo=rpmforge munin-node.noarch munin.noarch The configuration file for Apache is located at: vi /etc/httpd/conf.d/munin.conf Create the username/password file referred to in the above file: htpasswd -cm /etc/munin/munin-htpasswd muninadmin New password: Re-type new password: Restart the munin-node service and ensure it starts on boot: /etc/init.d/munin-node start chkconfig… Read more »

gcp: Copy with a Progress Bar


I decided to try and use gcp by default in place of the normal cp command so that I would have a progress bar by default. On Ubuntu install gcp with: sudo apt-get install gcp Now to use gcp by default instead of cp: mv /bin/cp /bin/cp-default ln -s /usr/bin/gcp /bin/cp Note: For a recursive… Read more »

Pxeboot CentOS Environment

Organised Chaos

While re-purposing a few old Google Search Appliances I set up a Network Boot Enviornment as follows: Install Dependencies yum install tftp-server tftp syslinux httpd dhcp Configure tftp mkdir /tftpboot vi /etc/xinetd.d/tftp service tftp { socket_type             = dgram protocol                = udp wait                    = yes user                    = root server                  = /usr/sbin/in.tftpd server_args             = -s -v /tftpboot… Read more »

smbclient: Special Characters and UTF-8

I have a PHP web application that communicates to Windows Shares via the smbclient binary. My problem was that some characters (particularly accented characters such as é ) were not being shown on the PHP page and were even causing lines of output to be omitted. After ensuring the PHP page was outputting UTF8 I… Read more »

Media Streaming on Ubuntu with Mediatomb


Install with: sudo apt-get install mediatomb Amend the /etc/mediatomb/config.xml file. I find the  configuration below works well for all the video types I throw at it. Then access the web interface at http://localhost:49152 logging in with mediatomb/mediatomb and add some video directories to be served. <?xml version=”1.0″ encoding=”UTF-8″?> <config version=”2″ xmlns=”″ xmlns:xsi=”” xsi:schemaLocation=””><!– Read /usr/share/doc/mediatomb-common/README.gz… Read more »

Exim Troubleshooting

We had a bit of difficulty yesterday with LDAP / Active Directory authentication within Exim. Sending mail via SMTP with authentication was timing out and it looked like a TLS error. 2013-10-01 14:39:12 [17013] TLS error on connection from blahblahblah (ehloname) []:52031 I=[]:587 (SSL_accept): error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol We got to the bottom of the problem… Read more »

Manipulating Image Metadata for Stock Photos


On a Linux desktop one thing I miss is the ability to easily add metadata (exif / iptc) to the images I upload to stock photo websites. Adding this metadata makes it much easier to submit the same photo to multiple websites. The ‘File Info’ command in Photoshop does what I want but I haven’t… Read more »

Automounting Netgear ReadyNAS CIFS Shares

I wanted to use Autofs to auto-mount the shares on my Netgear ReadyNAS upon entering specific directories so… Install pre-requisites: sudo apt-get install cifs-utils autofs   sudo gedit /etc/auto.master Add the line: /mnt/nas /etc/auto.nas –timeout=6000 –ghost   sudo gedit /etc/auto.nas And added the following lines: pictures -fstype=cifs,rw,noperm ://nas/pictures videos -fstype=cifs,rw,noperm ://nas/videos music -fstype=cifs,rw,noperm ://nas/music documents… Read more »