Just a quick update, to let you all knowing that the private datacenter is now redundant IaaS. The only thing it does not offer (yet) is a redundant network. The main cluster filesystem is spread over 4 hosts on 2 locations, which should improve reliability. Its also reliable to assume, that when you mirror hardware
Datacenter Oliekoets Read More »
First off, you need to have these 3 packages installed: – FFMPEG (optional) – FLAC – LAME FFMPEG is by far, the simpelest method. If you use it, it will automaticly convert the tags as well. Be sure that your installed version supports flac/mp3. With FFMPEG SCRIPT: #!/bin/bash for f in *.flac; do ffmpeg -i
Quickly convert flac audio to mp3 audio with Linux Read More »
For the Unix saturday night puzzle entry: #!/bin/bash cat $1|while read EMPID FIRST INIT LAST JOB SEX DATEX SAL EXT1 EXT2 do if [[ ${SAL} == “” && FIRST != “” ]]; then SAL=${DATEX} DATEX=${SEX} SEX=${JOB} JOB=${LAST} LAST=${INIT} INIT=””; fi let DATEPOCH=`date -d “$DATEX” +%s 2>/dev/null` 2>/dev/null let DATEPOCH=${DATEPOCH}-1 DATEX=`date –date @${DATEPOCH} +”%Y-%m-%d”` if [[
Saturdaynight Ubuntu puzzle Read More »
See the script below. Really useful if you are running out of inodes. #!/bin/bash # count inodes for each directory LIST=`ls` for i in $LIST; do echo $i find $i -printf “%in” | sort -u | wc -l done
Counting Inode usage on a directory Read More »
I recently came across an oracle redhat linux server without lost+found. It had been deleted because oracle needs an empty directory on installation. Albeit this is an insane rule, deleting an important system directory is a really bad idea. I will tell you why.
Deleting lost+found is a bad idea Read More »
There are a few reliable ways to detect if the host is a VMWare guest. The ones below make the most sense. First choice: “vmware_guest” expression => returnszero(“/bin/grep -qi vmware /proc/scsi/scsi”,”noshell”); Second choice: “vmware_guest” expression => fileexists(“/usr/sbin/vmware-toolbox-cmd”);
Detect VMware guest in cfengine Read More »
Ever wanted to bulk-rename files in linux? Say all files have extention txt, and you want to rename them to doc. Here’s how 😉 for i in `ls *.txt` do mv ${i} ${i%.*}.doc done
Bash file extension substitution the KISS way. Read More »
I recently came across a default SLES installation which has the following $PATH: (truncated for clarity) /sbin:/usr/sbin/:${HOME}/bin:/bin:/usr/sbin/:/usr/local/bin ………. This at first glance appears as a security problem , as a malevolant user can add $HOME/bin/ls and a user can execute a different ls or other arbitrary command that does something totally different. However, changing the
Evaluation order of $PATH variable and why its important to understand. Read More »
I installed owncloud today on my private unix webserver. Installation was fast & painless with Mysql backend, but sqlite somehow didn’t work. This program really is an awesome web application, as it allows you many things. It even intergrates my roundcube webmail client painlessly. -Mark.
Using tar and ssh to efficiently copy files preserving permissions This trick will tar a directory from a computer, but the file that it would normally create, is standard out, so it is redirected back to the script on the computer you are working on. The computer you are working on extracts the information directly,
SSH / TAR to copy over files Read More »
