Use iconv util in Ubuntu:
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iconv -f UTF-8 -t UTF-16 source.txt > dest.txt |
Convert utf-16 to utf-8
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Category Archives: Linux
Aerospike quickstart
Notes how to install and use Aerospike.
Install Aerospike
Installation steps from here: http://www.aerospike.com Continue reading
Install HBase on Linux dev
My dev environment
Ubuntu 14.04 LTS, HBase 1.2.1, Java 8, Hadoop 2.2.0
Prerequisites:
Java. How to install: http://dmitrypukhov.pro/install-java8-on-ubuntu/
Hadoop. How to install: http://dmitrypukhov.pro/install-hadoop-on-ubuntu/ Continue reading
Install Zookeeper on Linux
Zookeeper installation steps are nice and easy for dev environment.
- Download zookeeper from http://zookeeper.apache.org, extract it to some place, let it be /opt/zookeeper/
- Create a simple zoo.cfg file, i.e. copy config sample /opt/zookeeper/conf/zoo_sample.cfg to /opt/zookeeper/conf/zoo.cfg
- Start zookeeper
/opt/zookeeper/bin/zkServer.sh start - Stop zookeeper
/opt/zookeeper/bin/zkServer.sh stop
Copy files to remote computer using ssh
Using scp command for secure copying file to remote machine:
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scp <file> <user>@<machine>:<path on remote machine> |
Example:
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scp -i ~/.ssh/myKey.pem ~/file1.txt ubuntu@192.168.0.2:"~/file2.txt" |
Kill Linux process
Filter processes by string pattern (let it be “java” processes):
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ps -eaf | grep java |
Find my process in resulted list and kill by id:
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kill -9 123 |
Kill all processes by “java” pattern:
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kill -9 `ps -eaf | grep java | grep -v grep | awk '{print$2}'` |
Eclipse: could not load the Tomcat server configuration
Starting Tomcat7 from Eclipse produced an error:
Could not load the Tomcat server configuration at /usr/share/tomcat7/conf. The configuration may be corrupt or incomplete.
Solution:
Tomcat7 split into different folders by default. Eclipse expects Tomcat to be in one folder. To resolve, we create symbolic links in Tomcat home dir.
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cd /usr/share/tomcat7 sudo ln -s /var/lib/tomcat7/conf conf sudo ln -s /var/log/tomcat7 log sudo ln -s /etc/tomcat7/policy.d/03catalina.policy conf/catalina.policy sudo chmod -R a+rwx /usr/share/tomcat7/conf /etc/init.d/tomcat7 stop |
Now Eclipse should be able to start Tomcat.
Install Apache Spark on Ubuntu
Simple steps to run Spark 1.5.2 on Ubuntu 14.04 with Yarn (Hadoop 2.7.1)
Install Hadoop (see http://dmitrypukhov.pro/install-hadoop-on-ubuntu/)
Download pre-build Spark from http://spark.apache.org/downloads.html and unpack, say to /opt/spark/ Continue reading
PGAdmin is freezing in Linux
Enrironment: PGAdmin III, Ubuntu 14.x on different machines.
Symptoms: PGAdmin hangs, window grayed. Sometimes it happens occationally when connecting to DB, more often – when opening table properties or SQL queries window.
Solution: remove PGAdmin queries history file
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rm ~/.pgadmin_histoqueries |
Postgis installation steps
Configuration: Ubuntu 14.04, postgresql 9.3, postgis 2
Install all postgis* libraries