Das Keyboard 4 Ultimate
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The BEST Mechanical Keyboard EVER
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Author Archives: Etay Cohen-Solal
FFMPEG CentOS 7 installation instructions
FFMPEG CentOS 7 installation instructions
In the next tutorial I will show you how to install FFMPEG on Centos 7…
Kafka CentOS Installation Instructions
Kafka CentOS Installation Instructions
If you’re here, you’re probably knows what `Kafka` is and what it should be used for.
If not, visit Apache Kafka page to learn more
EPEL CentOS 7 – Add Fedora EPEL repository
EPEL CentOS 7
In the next tutorial I will show you how to add the fedora EPEL repository to your CentOS 7 installation.
CentOS Automatic Updates
CentOS Automatic Updates
CentOS Automatic Updates tutorial.
This tutorial apply to Centos 5.x, 6.x and 7.x.
CentOS 7 VirtualBox Guest Additions Installation
CentOS 7 VirtualBox Guest Additions Installation Tutorial
In the following tutorial, I’ll demonstrate how to install Guest Additions on your VirtualBox hosted CentOS 7 Minimal machine.
Although this tutorial is intended for CentOS 7 minimal, it’s will probably also work on other CentOS releases.
Template engine – Why it’s better to use two of them at once?
Template engine
In the following post I’ll try to show and explain how and why I am using two template engines in every application I’m working on. Also, why and how I am choosing my template engine(s) I’m working with.
Android Context in non-activity Class – The Secret of ContextWrapper
Android Context in non-activity Class – The Secret of ContextWrapper
One of most frustrating issues I had to figure out when I’ve started to develop for Android was the Context.
Android Get Mobile IP Address code example
Android Get Mobile IP Address
Getting the android IP address for Wi-Fi connection using the API is very simple:
CentOS Grails installation tutorial for newbs – CentOS 6.x
centos grails
centos grails installation tutorial for newbs. for CentOS 6.x (And probably for older/later)
Prerequisities
You have to install Groovy (which require JDK). If you don’t have Groovy (And JDK) installed follow those instructions.
- Java SDK 1.4+ for Grails 1.0.x and 1.1.x
- Java SDK 1.5+ for Grails 1.2 or greater (For this tutorial make sure you have JDK 1.5+ installed)
Install Grails
Option 1: Using GVM (Recommended)
If you’ve installed groovy using GVM, you can use the GVM to install grails too. use:
gvm install grails
centos grails
Option 2: Manual Installation
We’d go by the official Grails manual:
The folder we’ll install Grails is: /usr/grails, but you can choose any other as you like.
Init Folder
cd /usr mkdir grails cd grails
Here we’ll put the grails files by version.
Visit the download page to get the latest version. as for now it’s 2.3.7
wget http://dist.springframework.org.s3.amazonaws.com/release/GRAILS/grails-2.3.7.zip unzip grails-2.3.7.zip rm grails-2.3.7.zip
Install wget & unzip if you don’t yet have them install by: yum install wget unzip
add the following to your ~/.bash_profile or ~/.bash_rc (or wherever you init your user environment):
# grails export GRAILS_HOME=/usr/grails/grails-2.3.7 export PATH=$PATH:$GRAILS_HOME/bin
That’s it
Option 3: Using GIT
If you want to be updated with latest patches (and bugs) you can clone the git repo.
Prerequisities: you should have JDK installed, your JAVA_HOME set and GIT installed (yum install git).
For the 2.0.x and the ‘master’ branch:
cd /usr git clone https://github.com/grails/grails-core cd grails-core && ./gradlew install
and set your GRAILS_HOME in the ~/.bash_profile (or ~.bash_rc):
# grails export GRAILS_HOME=/usr/grails-core export PATH=$PATH:$GRAILS_HOME/bin
If you want to install older branch read here.
Testing grails
Type at command:
grails --version
You should get something like this output (depend on version)
That’s It! you have centos grails installed.
Cheers!
CentOS Groovy installation tutorial for newbs – CentOS 6.x
CentOS Groovy
CentOS Groovy installation instruction for newbs.
Prerequisities
JDK
To install Groovy you have to install the JDK. If you don’t have JDK installed yet follow those instructions by RaveMaker.
Groovy Installation
There are several mothods (as always) to install groovy into your CentOS box.
Option 1: GVM
The simplest is using the GVM, tool for managing parallel Versions of multiple Software Development Kits on most Unix based systems. It provides a convenient command line interface for installing, switching, removing and listing Candidates.
GVM is a powerful tool to install Candidates and switch between them (on current terminal, or by default). reading the full intro to GVM is recommended.
to install GVM use the command:
curl -s get.gvmtool.net | bash
This will quickly install GVM into your system
Run the following command as required or log again to the system, as GVM is adding this line to your ~/.bash_profile file:
source "/root/.gvm/bin/gvm-init.sh"
which should return nothing. now you are ready to install groovy by:
gvm install groovy
centos groovy install
Notes:
- This will installed groovy version 2.2.2. you can use GVM to install specific groovy version, or multiple versions (read the manual).
- GVM will create the ~/.gvm directory with all the assets inside (~/.gvm/groovy/2.2.2).
that’s it.
Option 2: Manual Installation
It’s always recommended to manually install every peace of code to fully understand what going on there. Following the official installation guide,
Download binary
Download binary for groovy from the download page (check if there is newer version, or specific version you need other then 2.3.0-beta-2 shown here):
cd /usr mkdir groovy cd groovy wget http://dl.bintray.com/groovy/maven/groovy-binary-2.3.0-beta-2.zip unzip groovy-binary-2.3.0-beta-2.zip rm groovy-binary-2.3.0-beta-2.zip
This will create a /usr/groovy/groovy-2.3.0-beta-2 folder with the files packed inside.
* If you don’t have wget installed use then ‘yum install wget’ command to install it.
* If you don’t have unzip installed use then ‘yum install unzip’ command to install it.
TIP
Create a symlink to that folder named ‘latest’ which you can change later when you’ll update your groovy installation without the need to update the environment variables.
ln -s groovy-2.3.0-beta-2 ./latest
Set-up environment
Last thing you need is to:
- set your GROOVY_HOME environment variable to the directory you unpacked the distribution
- add GROOVY_HOME/bin to your PATH environment variable
Edit your ~/.bash_profile file and append the following lines:
# Groovy export GROOVY_HOME=/usr/groovy/latest export PATH=$PATH:$GROOVY_HOME/bin
or, if you didn’t created the latest symlink, use:
# Groovy export GROOVY_HOME=/usr/groovy/groovy-2.3.0-beta-2 export PATH=$PATH:$GROOVY_HOME/bin
Test Groovy
groovy -e ‘println(“Hello, World!”)’
centos groovy
And that’s it! You have Groovy Installed.
Cheers!,
Do you need Grails framework for Groove? Read my walkthrough tutorial.
CentOS golang Installation Instructions – for CentOS 6.x
CentOS golang
CentOS golang Installation Instructions – for CentOS 6.x.
In the following tutorial I’ll show how to install and run “Hello, world!” script with golang on CentOS 6.x
CentOS golang Installation Instructions – for CentOS 6.x
Install EPEL
If you haven’t install EPEL repository yet, you’ll need it now. follow those instructions.
If you want newer versions of golang you might want to try the hop5.in repository but I haven’t tried.
Install golang
Simple as:
yum install golang
you may want to install hg also, you’ll probably will need it later for the ‘go get’ command:
yum install hg
Hello, World!
create a file named ‘hello.go’ and fill it with:
package main
import "fmt"
func main() {
fmt.Println("Hello, World!")
}
run the script using:
go run hello.go
centos-golang
You can first build to a binary executible with:
<div class="codecolorer-container text railscasts" style="overflow:auto;white-space:nowrap;width:555px;"><table cellspacing="0" cellpadding="0"><tbody><tr><td class="line-numbers"><div>1<br /></div></td><td><div class="text codecolorer">go build hello.go</div></td></tr></tbody></table></div>
and then run with:
<div class="codecolorer-container text railscasts" style="overflow:auto;white-space:nowrap;width:555px;"><table cellspacing="0" cellpadding="0"><tbody><tr><td class="line-numbers"><div>1<br /></div></td><td><div class="text codecolorer">./hello</div></td></tr></tbody></table></div>
$GOPATH
The ‘Hello, World!’ is a very basic example, but in real-world you may need to install packages and libraries for more complex applications.
The $GOPATH environment variable specifies the location of your workspace. It is likely the only environment variable you’ll need to set when developing Go code.
If your project for example is located at $HOME/go, you should create a variable like:
export GOPATH=$HOME/go
For convenience, add the workspace’s bin subdirectory to your path:
export PATH=$PATH:$GOPATH/bin
Now, your project environment variables are set and you can download packages with the simple command: (for example – the Google OAuth 2.0 library)
go get code.google.com/p/goauth2/oauth
What’s next
- visit A tour with go.
- gocode – An autocompletion daemon for the Go programming language
- Libraries in Go.
Web Applications using Go
- Writing Web Applications tutorial.
- Bones – A project template for Go webapps.
- Gorilla web toolkit.
- Revel – A high-productivity web framework for the Go language. Deploy Revel.
- Martini – Classy web framework for Go.
- sawsij – lightweight, open-source web framework for building high-performance, data-driven web applications.
Template Engines for Go
- Tutorial on Go Templating. “html/template” / “text/template”. Template Nesting Explanation.
- Mustache – Logic-less templates.
Web Applications in Production
- Go in Production: Discussion on Production.
- Production tools: Daemonize, Supervisor. uWSGI Go support (1.4 only) or using UpStart.
- Automating Deploy using Fabric.
That’s it!, Cheers!