Author Archives: Etay Cohen-Solal

About Etay Cohen-Solal

Development Specialist, Artist and Activist
Personal Website

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CentOS 7 VirtualBox Guest Additions Installation

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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.

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Template engine – Why it’s better to use two of them at once?

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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.

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CentOS Grails installation tutorial for newbs – CentOS 6.x

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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

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)

grails-version

 

That’s It! you have centos grails installed.

Cheers!

CentOS Groovy installation tutorial for newbs – CentOS 6.x

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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

gvm-install

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

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

centos groovy

 

And that’s it! You have Groovy Installed.

Cheers!,

 

grails-logo    Do you need Grails framework for Groove? Read my walkthrough tutorial.

 

CentOS golang Installation Instructions – for CentOS 6.x

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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

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

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

Web Applications in Production

 

 

That’s it!, Cheers!