Category Archives: Bash

How to get process memory consumption list linux

Posted by on January 29, 2016 No comments

Pretty easy
for resident memory consumption

ps -e -orss=,args= | sort -b -k1,1n

for virtual memory consumption

ps -e -ovsz=,args= | sort -b -k1,1n

Linux sort is great!
-k1,1n
means sort by 1st column in numeric order

Accordin to official manual:

`--key=POS1[,POS2]'
     Specify a sort field that consists of the part of the line between
     POS1 and POS2 (or the end of the line, if POS2 is omitted),
     _inclusive_.

     Each POS has the form `F[.C][OPTS]', where F is the number of the
     field to use, and C is the number of the first character from the
     beginning of the field.  Fields and character positions are
     numbered starting with 1; a character position of zero in POS2
     indicates the field's last character.  If `.C' is omitted from
     POS1, it defaults to 1 (the beginning of the field); if omitted
     from POS2, it defaults to 0 (the end of the field).  OPTS are
     ordering options, allowing individual keys to be sorted according
     to different rules; see below for details.  Keys can span multiple
     fields.

     Example:  To sort on the second field, use `--key=2,2' (`-k 2,2').
     See below for more notes on keys and more examples.  See also the
     `--debug' option to help determine the part of the line being used
     in the sort.

How to tar.gz yesterday logs (some etl magic)

Posted by on September 21, 2015 No comments

Task: need to tar yesteday logs in one file and gzip it.
Little bash code, just to save my time in future.

#!/bin/bash

src='/var/spool/etl/archive'

dt=`date --date="1 day ago" +"%Y-%m-%d"`
#create empty tar archive
tar cvf $src/$dt.tar --files-from /dev/null

for i in `ls -1 $src/*$dt* | grep -v gz | grep -v tar`; do
  tar -rf $src/$dt.tar $i
  rm -f $i
done
gzip $src/$dt.tar

video sound track merger

Posted by on September 18, 2015 No comments

Few “years” ago I made part of small promo project for Nestle Russia as subcontractor.
It was promo action, website with some videos. Kids make sound track and my task was to merge user sound track and original video soundtrack.
It`s really easy to do with ffmpeg or mencoder.

BTW: ffmeg much better it works o.k. with aac codec and mp4 container.

Code is VERY VERY dirty, we had absolutely no time, but it can be useful to someone. And I save it “just to remember”.

#!/bin/bash

( #start subprocess
  # Wait for lock on /var/lock/.merger-1.lock (fd 200) for 10 seconds
  flock -x -w 3 200
  if [ "$?" != "0" ]; then echo Cannot lock!; exit 1; fi
  echo $$>>/var/lock/.merger-1.lock #for backward lockdir compatibility, notice this command is executed AFTER command bottom  ) 200>/var/lock/.myscript-1.exclusivelock.


sourcevideo="/var/www/kinder_prod/sourcevideo"
sourceaudio="/var/www/kinder_prod/audioupload"
targetdir="/var/www/kinder_prod/processedvideo"
processedaudio="/var/www/kinder_prod/processedaudio"

while true; do

if [ "$(ls -A $sourceaudio)" ]; then

  for i in `ls -1 $sourceaudio/*.wav | xargs -n1 basename`; do
  videoid=`echo $i | awk -F"--" '{print $1}'`
  audioid=`echo $i | awk -F"--" '{print $2}' | awk -F"." '{print $1}'`

  sox $sourceaudio/$i /tmp1/$i rate 44100; mv /tmp1/$i $sourceaudio/$i; chown milkslice:milkslice $sourceaudio/$i || exit 1

  sox -m $sourcevideo/$videoid.mp3 $sourceaudio/$i /tmp1/$videoid--$audioid.mp3 && \
  ffmpeg -y -i /tmp1/$videoid--$audioid.mp3 -strict experimental -acodec aac -bsf:a aac_adtstoasc /tmp1/$videoid--$audioid.aac && \
    ffmpeg -y -i /tmp1/$videoid--$audioid.aac -i $sourcevideo/$videoid.mp4 -bsf:a aac_adtstoasc -preset ultrafast -c copy $targetdir/$videoid--$audioid.mp4 || exit 1
#   mencoder -of lavf -lavfopts format=mp4 -oac copy  -fafmttag 0x706D  \
#-audiofile /tmp1/$videoid--$audioid.aac  -ovc copy $sourcevideo/$videoid.mp4 -o $targetdir/$videoid--$audioid.mp4 || exit 1
    chown milkslice:milkslice $targetdir/$videoid--$audioid.mp4
    mv -f $sourceaudio/$i $processedaudio
    rm /tmp1/$videoid--$audioid.mp3
        rm /tmp1/$videoid--$audioid.aac

    done

fi

sleep 1;
done

) 200>/var/lock/.merger-1.lock   #exit subprocess

FLOCKEXIT=$?  #save exitcode status

exit $FLOCKEXIT

And run screen with script. (alternative to upstart)

/usr/bin/screen -dm bash -c 'cd /root/merger-prod; /root/merger-prod/merger-prod.sh'

How to delete files without big iowait

Posted by on July 23, 2015 No comments

I know 2 ways, tested in high loaded production.

if scheduler support ionice (on some systems makes LA)

 # ionice -c 3 nice -n 20 find  /DIRECTORY -type f -delete

Just ajust sleep time, according to your system LA

while true; do find /DIRECTORY/ -type f -print  -delete -quit; sleep 0.01; done

kill process running longer than (bash)….

Posted by on July 7, 2015 No comments

At one our advertising server located far beyond in another galaxy 🙂 🙂 rsync over ssh begin to hung sometimes without any reason.
of course, we will try strace and other debug tools but tomorrow. Today we need quick fix sollution.

BTW
removing compression not help, and –timeout option rather not help solve this case
my rsync command:

 rsync --timeout=30 -apvre ssh -o StrictHostKeyChecking=no
       --remove-source-files /opt/logrsync/workdir/clicks/etl/20150707215235-SERVERNAME.pb.gz
       etl@etl2-1.SERVERNAME.it.randomthemes.com:~/etl/data/sources/clicks/

How to find rsync processes running more then 10 seconds, and kill them (bash):

while true; do
      for i in `ps -C rsync -o pid=,etimes= | awk '{if ($2 > 10) print $1}'`; do
       echo $i; kill $i; sleep 10;
      done
done

if somebody solve the same rsync issue – please, please tell me how!

In our case everything start working o.k. without any action, It was connectivity issue, but very very strange.
–timeout should help.

my OsX bash .profile

Posted by on November 3, 2014 No comments

Just to remember. I add some locale settings to avoid ????? instead of letters in console Unicode programms (such as MC)

# MacPorts Installer addition on 2013-01-22_at_14:43:51: adding an appropriate PATH variable for use with MacPorts.
export PATH=/opt/local/bin:/opt/local/sbin:$PATH
# Finished adapting your PATH environment variable for use with MacPorts.

HISTCONTROL=ignoredups:ignorespace

# for setting history length see HISTSIZE and HISTFILESIZE in bash
HISTSIZE=2500
HISTFILESIZE=5000

export LANG=en_US.UTF-8
export LANGUAGE=en_US.UTF-8
export LC_MESSAGES=POSIX
export LC_ALL=en_US.UTF-8

export editor=/usr/bin/vim

export PS1='\[\e]0;\u@\h: \w\a\]\[\033[01;31m\]\u\[\033[01;33m\]@\[\033[01;36m\]\h \[\033[01;33m\]\w \[\033[01;35m\]\$ \[\033[00m\]'

export force_color_prompt=yes
export HISTTIMEFORMAT="%h/%d - %H:%M:%S "

    #color ls
    alias ls='ls -G'
    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'
 
    alias ll='ls -alF'
    alias la='ls -A'
    alias l='ls -CF'

linux how to create a service

Posted by on September 24, 2014 No comments

First of all read http://upstart.ubuntu.com/getting-started.html upstart is beautiful 🙂 If your linux supports it.
But in some systems you should use old init style scripts 🙁

cp /etc/init.d/sceleton /etc/init.d/rec-runner
and edit it.

/etc/init.d/rec-runner
Read more »

How to test cdn delivery speed via curl

Posted by on June 8, 2014 No comments

Our company use our own CDN based on nginx caching. 7 high loaded (40 000 RPS per server) servers in 2 datacenters.
And periodically I observer some deviations in delivery time. from 0.15 to 7.5 or even 30 seconds.
We have nginx SLA module + Graphics and monitoring. But I need to test all servers for anomaly delivery time.

#!/bin/bash

for l in ip1.x.x.x \
         ip2.x.x.x \
         ....
         ipN.x.x.x; do

echo $l;

    for i in {1..1024}; do
    curl -s -w "%{time_total} -- %{time_connect}\n" -o /dev/null --resolve it.randomthemes.com:443:$l https://it.randomthemes.com/favicon.ico >> ./$l.txt
    done

done

Then analyse ipN.x.x.x.txt any way you like.

cat | sort -n | tail -n 25
etc.

Have a nice day. I really like curl and hope this will help someone.

ext4 perfomance tuning

Posted by on May 17, 2014 No comments

I use following mount options.
In some projects it gives significant performance boost.

errors=remount-ro – need for hardware problem case. Because if disc remains mounted, further writing attempts can deadly damage file system. And one more case – easy monitoring. Just check via zabbix or nagios that you have no ro file system.

noatime, nodiratime – not fix access time. Double check that your applications doesn`t need this.

discard – use trim for SSD drive. In case SATA or SAS this option ignored by system.
commit, nobarrier – dangerous in case of power outage. But for my infrastructure o.k.

ext4 errors=remount-ro,noatime,nodiratime,commit=100,discard,nobarrier

And SED for fstab fixing (I use puppet, chef, fabric).

sed -r -i 's/ext4\s+defaults/ext4 errors=remount-ro,noatime,nodiratime,commit=100,discard,nobarrier/' /etc/fstab

some qute bash compare

Posted by on February 19, 2014 No comments

Task – need to generate routes file for openvpn from list of our networks.
Check, if file different from current route script, replace one and do some action. This task occurs very often.
Code is very simple, so:

cat /etc/ipfw.list | awk '{print "push "route " $1 "" "  }' > /root/test1;
if [ `diff /root/test /root/test1 | wc -l ` -eq 0  ];  
  then  
    echo "no difference";
  else echo "differ";
    rm -f /root/test; mv /root/test1 /root/test;
fi