April « 2013 « Gugulethu Ncube

Apple Safari Installation in Ubuntu Firstly install PlayOnLinux, which allow easy ... Read more

Installation Redis is a fast key value store developed by Salvatore Sanfilippo (antirez). Redis ... Read more

Installation pylibmc is a great Python client for memcached written in C.

1	sudo pip install pylibmc

Mini ... Read more

Installation beanstalkc is a c-based python client library for beanstalkd. Installation ... Read more

Installation through Ubuntu Repository

1	sudo apt-get install -y beanstalkd

The ... Read more

Installation using PIP

# install python-pip

sudo apt-get install -y python-pip

# install cql driver

sudo pip install cql

Manual Installation from ... Read more

Install easy_install and pip

# install easy_install

sudo apt-get install -y python-setuptools

# install python-pip

sudo apt-get install -y python-pip

Install pycassa

1	sudo pip install pycassa

Test ... Read more

Introduction Kestrel is a cool, light-weight persistent message queue server written ... Read more

The example below shows command rediects to a variable, especially when the output ... Read more

How-To 1. Login In 2. a. Top Right of Page -> "Screen Options" -> [Show on ... Read more

wmstat

vmstat 1

htop Installation

1 2	sudo apt-get install -y htop sudo htop

atop Installation

1 2	sudo apt-get install -y atop sudo atop

How ... Read more

Installation

#php

sudo apt-get install -y php5

#php5 with apache2

sudo apt-get install -y libapache2-mod-php5

#optional: execute standalone php scripts

sudo apt-get install -y php5-cli

#mysql driver for PHP5

sudo apt-get install -y php5-mysql

#unzip

sudo apt-get install -y unzip

# mysql

sudo apt-get install -y mysql

# apache webserver

sudo apt-get install -y apache2

# create download directory

mkdir -p ~/build/wordpress

cd ~/build/wordpress

# download

wget http://wordpress.org/latest.zip

unzip -qo latest.zip

cd wordpress

# create .htaccess file for nice URL

cat > .htaccess <<"_EOF_"

# BEGIN WordPress

RewriteEngine On

RewriteBase /

RewriteRule ^index\.php$ - [L]

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule . /index.php [L]

</IfModule>

# END WordPress

_EOF_

# check .htaccess contents

#cat ./wordpress/.htaccess

#ls -l /var/www/

# create wp config file

cp wp-config-sample.php wp-config.php

#database credentials

wp_database="wpzdb"

wp_user="wpz"

wp_password="wpzpassword"

# create user - inline in bash

echo "

CREATE DATABASE IF NOT EXISTS $wp_database;

CREATE USER '$wp_user'@'localhost' IDENTIFIED BY '$wp_password';

CREATE USER '$wp_user'@'127.0.0.1' IDENTIFIED BY '$wp_password';

GRANT ALL ON $wp_database.* TO '$wp_user'@'localhost' IDENTIFIED BY '$wp_password';

GRANT ALL ON $wp_database.* TO '$wp_user'@'127.0.0.1' IDENTIFIED BY '$wp_password';

"|mysql -u root --password=root

#set database credentials in wp-config.php

sed -i "s/define('DB_NAME', 'database_name_here');/define('DB_NAME', '$wp_database');/ig" wp-config.php

sed -i "s/define('DB_USER', 'username_here');/define('DB_USER', '$wp_user');/ig" wp-config.php

sed -i "s/define('DB_PASSWORD', 'password_here');/define('DB_PASSWORD', '$wp_password');/ig" wp-config.php

#copy wordpress files to the /var/www directory

cd ..

sudo cp -r wordpress/* /var/www/

sudo chown www-data:www-data -R /var/www

# Go to http://localhost to finish up installation

#in case of errors, check if the apache webserver and mysql are running

ps -ef|grep -E "apache2|mysql"

References 1. Home : http://wordpress.org/ 1. ... Read more

Installation

# add cassandra sources to /etc/apt/sources.list.d/cassandra.sources.list

# cassandra version 21x

sudo tee /etc/apt/sources.list.d/cassandra.sources.list <<_EOF_

deb http://www.apache.org/dist/cassandra/debian 21x main

deb-src http://www.apache.org/dist/cassandra/debian 21x main

_EOF_

# check if file written properly

#cat /etc/apt/sources.list.d/cassandra.sources.list

# add apache cassandra keys

gpg --keyserver keyserver.ubuntu.com --recv-keys 4BD736A82B5C1B00

gpg --export --armor 4BD736A82B5C1B00 | sudo apt-key add -

gpg --keyserver keyserver.ubuntu.com --recv-keys F758CE318D77295D

gpg --export --armor F758CE318D77295D | sudo apt-key add -

#sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 4BD736A82B5C1B00

# update repository

sudo apt-get update

# install

sudo apt-get install -y cassandra

# More sane default configurations - the default 50% free memory allocation is too much for me

if [ "`grep 'MAX_HEAP_SIZE="' /etc/default/cassandra`" == "" ] ; then

sudo tee -a /etc/default/cassandra <<"_EOF_"

# Set the Max Memory used by Cassandra, change to whatever value you like

MAX_HEAP_SIZE="700M"

HEAP_NEWSIZE="200M"

# Performance Tuning

# see also : http://wiki.apache.org/cassandra/PerformanceTuning

JVM_OPTS="$JVM_OPTS -XX:+UseThreadPriorities" # To lower compaction priority

JVM_OPTS="$JVM_OPTS -XX:ThreadPriorityPolicy=42" # To lower compaction priority

JVM_OPTS="$JVM_OPTS -Dcassandra.compaction.priority=1" # To lower compaction priority

JVM_OPTS="$JVM_OPTS -XX:+UseCompressedOops" # enables compressed references, reducing memory overhead on 64bit JVMs

_EOF_

fi;

# restart Cassandra

sudo service cassandra restart

# check Cassandra status

sudo service cassandra status

sudo /etc/init.d/cassandra status

# in case of errors, check the cassandra log files

ls -l /var/log/cassandra/

#total 7228

#-rw------- 1 root root 3193386 Apr 10 14:33 output.log

#-rw------- 1 cassandra cassandra 4194769 Apr 10 14:33 system.log

# less /var/log/cassandra/system.log

# Optional - Get Version Info about the running Cassandra Instance

# 1. check Cassandra version using nodetool (best option)

nodetool -h localhost version

# 2. check Cassandra version using debian package manager

dpkg -s cassandra |grep Version

# 3. check Cassandra version using cassandra-cli and expect module

sudo apt-get install -y expect

expect -c "spawn cassandra-cli;expect \"exit\";send \"quit;\r\n\";"

/etc/init.d/cassandra script I ... Read more

Delete files older than 30 days

1	find . -mtime +30 -exec rm {} \;

1. Save the ... Read more

# create download directory

mkdir -p ~/build/cassandra-cluster-admin

cd ~/build/cassandra-cluster-admin

# download

git clone https://github.com/sebgiroux/Cassandra-Cluster-Admin

# copy to web hosting directory - typically /var/www/

sudo cp -r Cassandra-Cluster-Admin /var/www/cassandra

sudo chown -R www-data:www-data /var/www/cassandra

#In a web browser, go to http://localhost/cassandra/

# enjoy :)

References 1. Home: https://github.com/sebgiroux/Cassandra-Cluster-Admin 2. ... Read more

Going back to the last directory you were in as easy as:

cd -

cd ... Read more

Helenos is a web based GUI Cassandra client that helps you to explore data and manage ... Read more

Installation Monit is a great application for monitoring and starting and automatically ... Read more

There are many ways to save a multi line string in bash. This is post just shows ... Read more

cassui is a web based interface over Cassandra which runs on any java servlet container ... Read more

DBeaver - Universal Database Manager - Installation

# download and dbeaver

mkdir -p ~/build/dbeaver

cd ~/build/dbeaver

# download

wget http://dbeaver.jkiss.org/files/dbeaver_2.1.1_amd64.deb

sudo dpkg -i dbeaver_2.1.1_amd64.deb

# link beaver executable

sudo ln -s /usr/share/dbeaver/dbeaver /usr/local/bin/dbeaver

# download jdbc drivers - which also include support Cassandra

# also

wget http://dbeaver.jkiss.org/files/driver-pack-2.1.1.zip

unzip driver-pack-2.1.1.zip -d driver-pack

sudo cp -r driver-pack/* /usr/share/dbeaver

# start DBeaver

dbeaver

# No user/password needed for test installation of cassandra

References 1. ... Read more

# create download directories

mkdir -p ~/build/jetty

cd ~/build/jetty

# download

version="9.0.0.v20130308"

wget -O jetty-distribution-$version.tar.gz "http://eclipse.org/downloads/download.php?file=/jetty/stable-9/dist/jetty-distribution-$version.tar.gz&r=1"

# extract the archive - creates directory jetty-distribution-....

tar -xvf jetty-distribution-$version.tar.gz

# rename jetty directory

sudo mv jetty-distribution-$version /usr/local

# create jetty user

sudo useradd -U -s /bin/false jetty

# Copy Jetty script to run as service

sudo chown -R jetty:jetty /opt/jetty

# move jetty.sh to init.d

sudo cp /opt/jetty/bin/jetty.sh /etc/init.d/jetty

# create /etc/default/jetty

sudo sh -c ' printf "

JAVA_HOME=/usr/java/default # Path to Java

NO_START=0 # Start on boot

JETTY_HOST=0.0.0.0 # Listen to all hosts

JETTY_PORT=8080 # Run on this port

JETTY_USER=jetty # Run as this user

" > /etc/default/jetty'

# make webapps writable

sudo chmod o+w /etc/default/jetty/webapps

# check if the installation settings are ok

/opt/jetty/bin/jetty.sh check

# Start Jetty as service

sudo service jetty start

# Start Jetty as service

sudo service jetty stop

# the server runs on the default port of 8080

# http://localhost:8080/

# To let Jetty automatically start on reboot execute

sudo update-rc.d jetty defaults

# deploy an app

cd myapp.war /opt/jetty/webapps

#In case port conflicts, you can check wich application is blocking port 8080

sudo netstat -lnptu|grep ":8080"

# monitor jetty log files

ls -l /opt/jetty/logs

References 1. Home: http://www.eclipse.org/jetty/ 2. ... Read more

Installation The Cassandra GUI Project is Java Swing based GUI for viewing data ... Read more

Installation

# create build directory

mkdir -p ~/build/wso2carbon

cd ~/build/wso2carbon

# download last wso2 library

wget https://dl.dropbox.com/s/ji3srheacuvgl6t/wso2carbon-4.0.0-SNAPSHOT.zip

# unzip

unzip wso2carbon-4.0.0-SNAPSHOT.zip

# set execute rights - they are already set correctly :)

#chmod +x wso2carbon-4.0.0-SNAPSHOT/bin/wso2server.sh

# create directories to copy the runtime data

sudo mkdir -p /var/lib/wso2carbon

sudo mv wso2carbon-4.0.0-SNAPSHOT /var/lib/wso2carbon

sudo ln -s /var/lib/wso2carbon/wso2carbon-4.0.0-SNAPSHOT/bin/wso2server.sh /usr/local/bin/wso2server.sh

# execute

wso2server.sh

Server URL: https://localhost:9443/ Username: ... Read more

Find files by date and regex find the files modified more than 3 days ago ... good ... Read more

Global WAN(G-WAN) is a web server developed by Pierre Gauthier. It is written in ... Read more

Gugulethu Ncube

me, myself and code

Monthly Archives: April 2013

Ubuntu – How to Install Apple Safari in Ubuntu 12.04, 12.10, 13.10, 14.04, 14.10

redis – Installation and Simple Test using redis-py in Ubuntu

pylibmc – Kestrel Queue Client – Simple Test using Memcache Protocol

beanstalkc – beanstalkd queue – python client library

Beanstalkd – Simple, Fast Queue – Installation

Apache Cassandra CQL3 – Installation and Tests using Python

pycassa – Gettting started with Apache Cassandra using python

Kestrel Queue – Installation in Ubuntu

Unix – Redirect Command Output To A Variable In Bash

WordPress – How to disable post comments

Unix – Process and Load monitoring in Linux

WordPress – Simple Blog Installation in Ubuntu – PHP, Apache, MySQL

Apache Cassandra – Installation in Ubuntu

Unix – Delete files older than a certain number of days using find command

Cassandra-Cluster-Admin – Apache Cassandra GUI – Installation

Linux – cd – – move to previous directory in bash shell

Helenos – Apache Cassandra GUI – Installation

Monit – Monitoring and Automatic Server Restart in Linux

Unix – Set Multi-Line Text To A String Variable Or Text File in Bash

cassui – Apache Cassandra GUI – Installation

DBeaver – Apache Cassandra GUI – Universal Database Manager Installation in Ubuntu

Jetty – Installation on Linux

Cassandra GUI – The Apache Cassandra GUI Project – Installation

wso2carbon – Apache Cassandra GUI – Installation on Linux

Unix – Find Files By Age And Timestamp

G-WAN Web Server – Installation and Test with Apache Bench