Category: Howtos

Ubuntu Clean old kernel images

Posted on by David Saliba

Be VERY CAREFUL with this.

 

sudo dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge

😉 nJoy

Install latest influxdb on Ubuntu

Posted on by David Saliba


curl -sL https://repos.influxdata.com/influxdb.key | sudo apt-key add -
source /etc/lsb-release
echo "deb https://repos.influxdata.com/${DISTRIB_ID,,} ${DISTRIB_CODENAME} stable" | sudo tee /etc/apt/sources.list.d/influxdb.list
sudo apt-get update && sudo apt-get install influxdb
sudo service influxdb start

nJoy 😉

 

PM2 set logs to compress and expire

Posted on by David Saliba

Referring to the github README.md https://github.com/pm2-hive/pm2-logrotate


pm2 install pm2-logrotate@2.6.0
pm2 set pm2-logrotate:compress true
pm2 set pm2-logrotate:max_size 10M
pm2 set pm2-logrotate:retain 7

pm2 conf

{
"pm2-logrotate": {
"max_size": "10M",
"retain": "7",
"compress": "true",
"dateFormat": "YYYY-MM-DD_HH-mm-ss",
"workerInterval": "30",
"rotateInterval": "0 0 * * *",
"rotateModule": true
},
"module-db": {
"pm2-logrotate": {
"uid": null,
"gid": null
}
}
}

nJoy 😉

Show all cronjobs for all users

Posted on by David Saliba

This is a simple script to get all cronjbs for all users on a system

for someone in $(cut -f1 -d: /etc/passwd); do echo $someone; crontab -u $someone -l ; done

nJoy 😉

 

Cool chkconfig replacement for Ubuntu

Posted on by David Saliba

Hi,

 

Ubuntu does not carry chkconfig any more ..

besides the standard

update-rc.d apache2 defaults

or

update-rc.d apache2 remove

There is a cool tool called : sysv-rc-conf.

This tool can be installed using :

sudo apt-get install sysv-rc-conf

On its own the command opens a cool ncurses interface like this :

 

 

 

 

 

 

 

 

 

It can Also be used in scripts as :

sysv-rc-conf atd <on or off> and --levels;

man sysv-rc-conf

Will give you some love..

nJoy 😉

 

 

converting webm to mp3s ffmpeg

Posted on by David Saliba 
for FILE in *.webm; do
    echo -e "Processing file '\e[32m$FILE\e[0m'";
    ffmpeg -i "${FILE}" -vn -ab 128k -ar 44100 -y "${FILE%.webm}.mp3";
done;

nJoy 😉

Snapshot backup using cp -al and rsync

Posted on by David Saliba

This script requires genuine cp -al capable gnu and rsync commands together with a hardlink capable FS + OS.

 

 

#!/bin/bash

[ $# -ne 2 ] && echo "Incorrect usage : $0 <source path> <target path>" && exit 128 ;

SOURCEFOLDER=$1
TARGETFOLDER=$2

SF_LEN=${#SOURCEFOLDER}-1
TF_LEN=${#TARGETFOLDER}-1

#echo "Last character in source folder is ${SOURCEFOLDER:SF_LEN}"
if [ "${SOURCEFOLDER:SF_LEN}" != "/" ] ; then
   echo "Adding trailing slash"
  SOURCEFOLDER=$SOURCEFOLDER"/"
fi



#echo "Last character in target folder is ${TARGETFOLDER:TF_LEN}"
if [ "${TARGETFOLDER:TF_LEN}" != "/" ] ; then
   echo "Adding trailing slash"
  TARGETFOLDER=$TARGETFOLDER"/"
fi



echo $SOURCEFOLDER
echo $TARGETFOLDER

LOCKFILE=/tmp/`echo $0 $SOURCEFOLDER $TARGETFOLDER | sed "s/[^[:alnum:]]/_/g"`.lck
echo "Lockfile : $LOCKFILE"



[ ! -d $SOURCEFOLDER ] && echo "Source does not exist !! $SOURCEFOLDER exitting with error" && exit 1;

TIMESTAMP=$(date --utc +%Y%m%d%H%M )
#echo $TIMESTAMP



if [ ! -d $TARGETFOLDER ]; then 

mkdir $TARGETFOLDER

rsync -av --delete  $SOURCEFOLDER $TARGETFOLDER/$TIMESTAMP/

else 

[ -d $TARGETFOLDER/$TIMESTAMP/ ] && echo "Folder already there !! Leaving.. " && exit 0;  

 LASTBACKUP=$(ls $TARGETFOLDER | sort -rn | head -1)
 echo "Link copying $TARGETFOLDER/$LASTBACKUP to $TARGETFOLDER/$TIMESTAMP/"
 cp -al $TARGETFOLDER/$LASTBACKUP $TARGETFOLDER/$TIMESTAMP/
 rsync -av $SOURCEFOLDER $TARGETFOLDER/$TIMESTAMP/

fi

echo " OK !! Done"