SRMKLIVE BLOG -

Docker: Deploying linux containers on Windows

January 22, 2019January 23, 2019 admin Leave a comment

Docker is a great way to containerize your applications. By using Docker, we can replicate production environment locally among many things. We often use Linux containers in this regard. The reason it can be run on either Linux/Mac machines easily.

But what if we need to setup this on a Windows machine. This post will guide you to write equivalent scripts for Windows as well.

Suppose we use the following scripts when working on Linux/Mac machines:

Linux/MacOS scripts

Suppose, following are startup & shutdown scripts for your docker containers. Suppose they are named start-container. & stop-container.:

Shutdown Script (stop-container)

#!/bin/bash
docker stop $(docker ps -a -q)
docker rm $(docker ps -a -q)
docker rmi --force $(docker images -q myapp/app)
docker volume rm -f $(docker volume ls -q)
docker network rm $(docker network ls -q)

#!/bin/bash

docker stop $(docker ps -a -q)

docker rm $(docker ps -a -q)

docker rmi --force $(docker images -q myapp/app)

docker volume rm -f $(docker volume ls -q)

docker network rm $(docker network ls -q)

Startup Script (start-container)

#!/bin/bash
./stop-container
docker-compose up -d --remove-orphans --build
docker container exec -i $(docker-compose ps -q auth) bash -c "service php7.1-fpm start &amp;&amp; service nginx start"

#!/bin/bash

./stop-container

docker-compose up -d --remove-orphans --build

docker container exec -i $(docker-compose ps -q auth) bash -c "service php7.1-fpm start && service nginx start"

Running on Windows?

The scripts mentioned above will not work on Windows. This happens due to some of the following reasons:

Command line scripts dont use the same architecture.
The commands need to be re-written for a separate platform.

Windows scripts (Solution)

Following are the startup & shutdown scripts for running your docker containers on Windows. Suppose they are named start-container.bat & stop-container.bat:

Shutdown Script (stop-container.bat)

FOR /f "tokens=*" %%i IN ('docker ps -a -q') DO docker stop %%i
FOR /f "tokens=*" %%i IN ('docker ps -a -q') DO docker rm %%i
FOR /f "tokens=*" %%i IN ('docker images -q myapp/app') DO docker rmi --force %%i
FOR /f "tokens=*" %%i IN ('docker volume ls -q') DO docker volume rm -f %%i
FOR /f "tokens=*" %%i IN ('docker network ls -q') DO docker network rm %%i

FOR /f "tokens=*" %%i IN ('docker ps -a -q') DO docker stop %%i

FOR /f "tokens=*" %%i IN ('docker ps -a -q') DO docker rm %%i

FOR /f "tokens=*" %%i IN ('docker images -q myapp/app') DO docker rmi --force %%i

FOR /f "tokens=*" %%i IN ('docker volume ls -q') DO docker volume rm -f %%i

FOR /f "tokens=*" %%i IN ('docker network ls -q') DO docker network rm %%i

Startup Script (start-container.bat)

call stop-container.bat
docker-compose up -d --remove-orphans --build
FOR /f "tokens=*" %%i IN ('docker-compose ps -q auth') DO SET AUTH=%%i
docker container exec -i %AUTH% bash -c "service php7.1-fpm start &amp;&amp; service nginx start"

call stop-container.bat

docker-compose up -d --remove-orphans --build

FOR /f "tokens=*" %%i IN ('docker-compose ps -q auth') DO SET AUTH=%%i

docker container exec -i %AUTH% bash -c "service php7.1-fpm start && service nginx start"

Laravel two-factor authentication

July 6, 2016September 30, 2016 admin 4 Comments

Two-factor authentication in Laravel

Two-factor authentication offers a way to add extra protection layer for your website’s user accounts. This allows your users to protect their accounts from unauthorized access. There are many providers that offers such services. In this post, we will use Authy. Authy provides a very robust API for implementing two-factor authentication. You can find API documentation for Authy here.

First you must install composer & create a new laravel application.

Installation

Use following command to install:

composer require srmklive/authy

1 2	composer require srmklive/authy

Add following to $providers array in config/app.php:

'Srmklive\Authy\Providers\AuthyServiceProvider' // Laravel 5

1 2	'Srmklive\Authy\Providers\AuthyServiceProvider' // Laravel 5

Srmklive\Authy\Providers\AuthyServiceProvider::class // Laravel 5.1 or greater

1 2	Srmklive\Authy\Providers\AuthyServiceProvider::class // Laravel 5.1 or greater

Add following to $aliases array in config/app.php:

'Authy' => 'Srmklive\Authy\Facades\Authy' // Laravel 5

1 2	'Authy' => 'Srmklive\Authy\Facades\Authy' // Laravel 5

'Authy' => Srmklive\Authy\Facades\Authy::class // Laravel 5.1 or greater

1 2	'Authy' => Srmklive\Authy\Facades\Authy::class // Laravel 5.1 or greater

Publish configuration:

php artisan vendor:publish

1 2	php artisan vendor:publish

Migrate user table changes to database:

php artisan migrate

1 2	php artisan migrate

Add the following lines to User model (e.g App\User.php)
- Before the class declaration, add these lines:

use Srmklive\Authy\Auth\TwoFactor\Authenticatable as TwoFactorAuthenticatable;
use Srmklive\Authy\Contracts\Auth\TwoFactor\Authenticatable as TwoFactorAuthenticatableContract;

use Srmklive\Authy\Auth\TwoFactor\Authenticatable as TwoFactorAuthenticatable;

use Srmklive\Authy\Contracts\Auth\TwoFactor\Authenticatable as TwoFactorAuthenticatableContract;

Now the change the class declaration. For example, if your class declaration is

class User extends Model implements AuthenticatableContract,
                                    AuthorizableContract,
                                    CanResetPasswordContract

class User extends Model implements AuthenticatableContract,

AuthorizableContract,

CanResetPasswordContract

to this:

class User extends Model implements AuthenticatableContract,
                                    AuthorizableContract,
                                    CanResetPasswordContract,
                                    TwoFactorAuthenticatableContract

class User extends Model implements AuthenticatableContract,

AuthorizableContract,

CanResetPasswordContract,

TwoFactorAuthenticatableContract

Now change the import traits line accordingly in user model file. For example if the line is:

use Authenticatable, Authorizable, CanResetPassword;

1 2	use Authenticatable, Authorizable, CanResetPassword;

use Authorizable, CanResetPassword, TwoFactorAuthenticatable;

1 2	use Authorizable, CanResetPassword, TwoFactorAuthenticatable;

Lastly, add/update $hidden variable to hide ‘two_factor_options’ field from any DB call for user detail:

protected $hidden = [
    'two_factor_options'
];

protected $hidden = [

'two_factor_options'

];

Implementation

You can view further documentation for this plugin here.

I have also implemented it in a sample laravel application as well. You can view installation instructions here. Through this application, you can do:

User login & registration.
Enable/Disable two-factor authentication for a user.

Following are the download links for the laravel demo application with two-factor authentication:

Install Nodejs from standard binaries in Linux

November 19, 2015November 19, 2015 admin Leave a comment

In this post, i will show you how to install Node.js from standard binaries(https://nodejs.org/) in Linux.

First check your system architecture with following commands:

getconf LONG_BIT

1	getconf LONG_BIT

uname -p

uname -p

On my system, the above two commands gave output 64 and x86_64 respectively. This means i need to install 64-bit version of Node.js.

Now lets download the latest version of Node.js from https://nodejs.org/. The current LTS release is 4.2.2.

wget https://nodejs.org/dist/v4.2.2/node-v4.2.2-linux-x64.tar.gz

1	wget https://nodejs.org/dist/v4.2.2/node-v4.2.2-linux-x64.tar.gz

After file is downloaded, run the following command to install Node.js

tar -C /usr/local --strip-components 1 -xzf node-v4.2.2-linux-x64.tar.gz

1	tar -C /usr/local --strip-components 1 -xzf node-v4.2.2-linux-x64.tar.gz

The above command will install node & npm in “/usr/local/bin“. You can check whether its installed by typing following commands:

node -v

node -v

npm -v

npm -v

Insufficient permission for adding an object

December 27, 2015July 10, 2016 admin Leave a comment

I got the following error when doing git pull:

Solution

Again stackoverflow comes to the rescue. To correct the issue, i only had to do this:

sudo chown -R $USER:$USER "$(git rev-parse --show-toplevel)/.git"

1	sudo chown -R $USER:$USER "$(git rev-parse --show-toplevel)/.git"