Mount SD card as executable

sudo mount /dev/mmcblk0p1 /mnt/sdcard/ --options rw,user,noauto,exec

Solve shared libraries error on Ubuntu 14.04 x64: libgconf, libudev

error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory

error while loading shared libraries: libudev.so.0: cannot open shared object file: No such file or directory

Futtasd a Terminálból - Run from Terminal:

sudo apt-get install libgconf-2-4:i386
sudo apt-get install libudev1 && cd /lib/i386-linux-gnu/ && sudo ln -s libudev.so.1 libudev.so.0

Programok processzorhasználatának korlátozása Linuxon

EN: How to Limit The CPU Usage of Any Process in Linux
Do your applications eat up all the CPU resources causing overheat? Not anymore with cpulimit:
https://github.com/sicambria/sh/blob/master/system/cpulimiter.sh

Edit:
BES should do something similar on Windows:
http://mion.faireal.net/BES/

Firefox hardening - extra biztonságos beállítások

Leírás - description:
https://github.com/pyllyukko/user.js/

cd ~/.mozilla/firefox
git clone 'https://github.com/pyllyukko/user.js.git'
cd XXXXXXXX.your_profile_name
ln -s ../user.js/user.js user.js

Error code: ssl_error_no_cypher_overlap

CIB problem in Firefox - Error code: ssl_error_no_cypher_overlap

Open about:config
Set to false:
security.ssl3.rsa_des_ede3_sha

Create Jmeter tests on Linux VPS and measure system resource usage with dstat

To run jmeter test from the command line:
http://forraskod.blogspot.hu/2015/06/jmeter-futtatasa-linux-parancssorbol-es.html

• Prepare for test - stop all other services

sudo service hue stop
sudo service sqoop-metastore stop
sudo service flume-master stop
sudo service flume-ng-agent stop
sudo service oozie stop
sudo service hiveserver2 stop
sudo service hive-metastore stop
sudo service hbase-thrift stop
sudo service hbase-master stop
sudo service hadoop-hbase-regionserver stop
sudo service hadoop-0.20-mapreduce-jobtracker stop
sudo service hadoop-0.20-mapreduce-tasktracker stop
sudo service hadoop-mapreduce-historyserver stop
sudo service hadoop-yarn-nodemanager stop
sudo service hadoop-httpfs stop
sudo service hadoop-hdfs-namenode stop
sudo service hadoop-hdfs-secondarynamenode stop
sudo service hadoop-hdfs-datanode stop
sudo service zookeeper-server stop
sudo service zookeeper stop
sudo pkill -f python
sudo pkill -f java
sudo service munin-node stop
sudo service cloudera-scm-agent stop

• Running dstat to measure CPU, RAM and disk usage

 dstat -d -c -m 3 | tee out/dstat25users.txt

•  Running Jmeter 20 seconds later from the load tester VM:

 ./jmeter -n -t addevent.jmx -Jusers=25 -Jrampup=30 -Jduration=600 -Jgraphcsv=~/out/test25gra.csv -l ~/out/test25.csv

• Stop dstat 20+ seconds after the Jmeter test has finished
• Repeat the test with other settings (e.g. 50 and 100 users)
• Upload results to an FTP server and download to local computer

tar -cvzf out.tar.gz out/ 
wput out.tar.gz ftp://USERNAME:PASSWORD@HOSTNAME/FOLDERNAME/

•  Open the results in the local Jmeter GUI and create the graphs

Jmeter futtatása Linux parancssorból és haladó grafikonok használata

EN: Running Jmeter from Linux command line

.jmx teszteset felkészítése a paraméterek kezelésére:

Preparing the .jmx test case for handling parameters

${__P(<variable name>,<default value>)}

to read command line property in JMeter. To pass value as arguments, the command will be:

Futtatás paraméterekkel - 300 másodperces teszt 4 felhasználóval:

jmeter -n -t PerformanceTest.jmx -Jusers=4 -Jduration=300

${__P(users,2)}

${__P(duration,2)}

${__P(rampup,2)}

${__P(graphcsv,2)}

wget http://mirrors.myaegean.gr/apache//jmeter/binaries/apache-jmeter-2.13.tgz

tar xvzf apache-jmeter-2.13.tgz

ln -s apache-jmeter-2.13/bin/jmeter ./jmeter

Fejlettebb grafikonok kiegészítőkkel:

Creating more advanced graphs with extra plugins

The extra graph options are available after installation in Jmeter > Test plan > Add > Listener

wget http://jmeter-plugins.org/downloads/file/JMeterPlugins-Extras-1.2.1.zip

sudo apt-get install unzip

unzip JMeterPlugins-Extras-1.2.1.zip -d jmeter-extras

cp jmeter-extras/lib/ext/JMeterPlugins-Extras.jar apache-jmeter-2.13/lib/ext/

echo 'OK'