Create Multiple Instances in a VPC Using Terraform

Rather than directly diving into the Terraform scripts, let’s quickly learn about what is Terraform and how IBM Cloud Schematics simplifies the Terraform scripting experience on IBM Cloud.

What is Terraform?

Terraform is an open-source software, developed by HashiCorp, that enables predictable and consistent provisioning of IBM Cloud platform, classic infrastructure, and VPC infrastructure resources by using a high-level scripting language. You can use Terraform to automate your IBM Cloud resource provisioning, rapidly build complex, multi-tier cloud environments, and enable Infrastructure as Code (IaC).

What is IBM Cloud Schematics?

With IBM Cloud Schematics, you can organize your IBM Cloud resources across environments by using workspaces. Every workspace points to a set of Terraform configuration files that build a Terraform template. You can choose to create your own Terraform template or use one of the pre-defined templates that are provided by IBM. Workspaces allow for the separation of concerns for cloud resources and can be individually managed with IBM Cloud Identity and Access Management. To use IBM Cloud Schematics, you don’t need to install the Terraform CLI or the IBM Cloud Provider plug-in for Terraform.

Let’s Get Started

Creating one VSI in a VPC is pretty easy using the Terraform IBM provider. If you check the documentation, the sample Terraform script goes like this:

Java

But what is the simplest way to provision multiple VSIs in a VPC?

This question came up while working on vpc-instance-extension code sample to auto-assign a floating IP as and when a new VSI is created.

#devops #infrastructure #terraform #vpc

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Create Multiple Instances in a VPC Using Terraform

Create Multiple Instances in a VPC Using Terraform

Rather than directly diving into the Terraform scripts, let’s quickly learn about what is Terraform and how IBM Cloud Schematics simplifies the Terraform scripting experience on IBM Cloud.

What is Terraform?

Terraform is an open-source software, developed by HashiCorp, that enables predictable and consistent provisioning of IBM Cloud platform, classic infrastructure, and VPC infrastructure resources by using a high-level scripting language. You can use Terraform to automate your IBM Cloud resource provisioning, rapidly build complex, multi-tier cloud environments, and enable Infrastructure as Code (IaC).

What is IBM Cloud Schematics?

With IBM Cloud Schematics, you can organize your IBM Cloud resources across environments by using workspaces. Every workspace points to a set of Terraform configuration files that build a Terraform template. You can choose to create your own Terraform template or use one of the pre-defined templates that are provided by IBM. Workspaces allow for the separation of concerns for cloud resources and can be individually managed with IBM Cloud Identity and Access Management. To use IBM Cloud Schematics, you don’t need to install the Terraform CLI or the IBM Cloud Provider plug-in for Terraform.

Let’s Get Started

Creating one VSI in a VPC is pretty easy using the Terraform IBM provider. If you check the documentation, the sample Terraform script goes like this:

Java

But what is the simplest way to provision multiple VSIs in a VPC?

This question came up while working on vpc-instance-extension code sample to auto-assign a floating IP as and when a new VSI is created.

#devops #infrastructure #terraform #vpc

Seamus  Quitzon

Seamus Quitzon

1595201363

Php how to delete multiple rows through checkbox using ajax in laravel

First thing, we will need a table and i am creating products table for this example. So run the following query to create table.

CREATE TABLE `products` (
 `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
 `name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
 `description` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
 `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
 `updated_at` datetime DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

Next, we will need to insert some dummy records in this table that will be deleted.

INSERT INTO `products` (`name`, `description`) VALUES

('Test product 1', 'Product description example1'),

('Test product 2', 'Product description example2'),

('Test product 3', 'Product description example3'),

('Test product 4', 'Product description example4'),

('Test product 5', 'Product description example5');

Now we are redy to create a model corresponding to this products table. Here we will create Product model. So let’s create a model file Product.php file under app directory and put the code below.

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Product extends Model
{
    protected $fillable = [
        'name','description'
    ];
}

Step 2: Create Route

Now, in this second step we will create some routes to handle the request for this example. So opeen routes/web.php file and copy the routes as given below.

routes/web.php

Route::get('product', 'ProductController@index');
Route::delete('product/{id}', ['as'=>'product.destroy','uses'=>'ProductController@destroy']);
Route::delete('delete-multiple-product', ['as'=>'product.multiple-delete','uses'=>'ProductController@deleteMultiple']);

#laravel #delete multiple rows in laravel using ajax #laravel ajax delete #laravel ajax multiple checkbox delete #laravel delete multiple rows #laravel delete records using ajax #laravel multiple checkbox delete rows #laravel multiple delete

Samanta  Moore

Samanta Moore

1623417960

Avoid Method Chaining When Using Multiple AutoCloseable Instances

Keep API design in mind.

The try-with-resources statement introduced in Java 7 allows us to adopt an approach where certain objects could be opened, being visible in the try block, and immediately closed when the execution reaches the end of that scope. This was a huge improvement for managing scarce resources, in comparison with the old approach of overriding the finalize() method (which we never exactly know when will be executed.)

Over the years, I was repeatedly seeing the following approach on some applications, which motivated me to write this post. Consider this code snippet for executing an SQL statement using JDBC:

Java

1

import javax.sql.DataSource;

2

import java.sql.*;

3

...

4

  public BigDecimal getSum(long empId) throws SQLException {

5

    String sql = "select sum(salary) from payroll where empId=?";

6

    try(PreparedStatement stmt = myDataSource.getConnection().prepareStatement(sql)) {

7

      stmt.setLong(1, empId);

8

      try(ResultSet rs = stmt.executeQuery()) {

9

        if (rs.next())

10

          return rs.getBigDecimal(1);

11

        return BigDecimal.ZERO;

12

      }

13

    }

14

  }

15

...

What the code does is unimportant, but the connection handling is very important. The outer try-with-resources ensures that at the end of its block, the PreparedStatement will be closed. The same thing goes with the ResultSet in the inner try-with-resources.

Here is the catch: the Connection object returned from the DataSource will never be closed. Since it was not bound to any variable inside the try-with-resources, according to the JLS (see References), the resource in the outer try-with-resources is of type PreparedStatement. As a result, the Connection instance is not participating in the statement, and so its close() method is never called.

The solution is easy: declare a variable referencing the resource you want to be auto-closed.

#java #java resources #multiple autocloseable instances #avoid method chaining #using multiple autocloseable instances

Kole  Haag

Kole Haag

1603213200

Using Terraform to Create an EC2 Instance With Cloudwatch Alarm Metrics

Hey guys! I wanted to do a quick tutorial on how I created an EC2 module for Terraform. If you want to see the repository it is located in check it out here. This module will do a few things:

  1. Create an EC2 Instance
  2. Automatically look up the latest Windows Server 2019 AMI for the EC2 instance.
  3. Create and attach a additional drive.
  4. Create a Cloudwatch Alarm Metric to monitor CPU.

The folder structure looks like this:

Image for post

First things first… I created the main.tf file which contains all of my configuration except for the variables and outputs. The main.tf has a few parts to it.

AWS Instance Code

The first section is the instance resource code

#AWS Instance

resource "aws_instance" "example" {
     ami = data.aws_ami.windows.id
     instance_type = "t2.micro"
     availability_zone = var.availability_zone
}

You will notice a few things here.

  1. The instance type is set in the module to t2.micro
  2. availability_zone is set using a variable
  3. ami is set using data

We will get the the availability zone piece in just a bit, first we are going to tackle the data used for the ami argument.

Data for AMI Using a Filter

The next bit of code for the filter looks like this

#AMI Filter for Windows Server 2019 Base

data "aws_ami" "windows" {
     most_recent = true
     filter {
       name   = "name"
       values = ["Windows_Server-2019-English-Full-Base-*"]
  }
     filter {
       name   = "virtualization-type"
       values = ["hvm"]
  }
     owners = ["801119661308"] ## Canonical
}

The argument most_recent is set to true. This means that it will grab the most recent AMI that fits the criteria that we specify in our filter.

Next you will notice that in the name we set the value to *Windows_Server-2019-English-Full-Base- **with the star at the end. This lets Terraform know we don’t care about what text comes after that point and it was done because the standard format puts the date there. If we set the date the ami was created and set the most_recent argument to true it would not do us any good.

After that we set the virtualization-type to hvm. I am not going to go into a lot of detail here. Just know this is a good idea and do some additional research on hvm vs pv.

Last we set **owners **to 801119661308.

Now I am sure you are asking… how the heck do I actually get this information? Well you are going to have to run a quick command with the AWS cli.

First, login to AWS and get the ami you want to grab the information for. Here is an example:

Image for post

If you click on launch instance you can do a search.

#aws-ec2 #hashicorp-terraform #aws-cloudwatch #terraform-modules #terraform

Why Use WordPress? What Can You Do With WordPress?

Can you use WordPress for anything other than blogging? To your surprise, yes. WordPress is more than just a blogging tool, and it has helped thousands of websites and web applications to thrive. The use of WordPress powers around 40% of online projects, and today in our blog, we would visit some amazing uses of WordPress other than blogging.
What Is The Use Of WordPress?

WordPress is the most popular website platform in the world. It is the first choice of businesses that want to set a feature-rich and dynamic Content Management System. So, if you ask what WordPress is used for, the answer is – everything. It is a super-flexible, feature-rich and secure platform that offers everything to build unique websites and applications. Let’s start knowing them:

1. Multiple Websites Under A Single Installation
WordPress Multisite allows you to develop multiple sites from a single WordPress installation. You can download WordPress and start building websites you want to launch under a single server. Literally speaking, you can handle hundreds of sites from one single dashboard, which now needs applause.
It is a highly efficient platform that allows you to easily run several websites under the same login credentials. One of the best things about WordPress is the themes it has to offer. You can simply download them and plugin for various sites and save space on sites without losing their speed.

2. WordPress Social Network
WordPress can be used for high-end projects such as Social Media Network. If you don’t have the money and patience to hire a coder and invest months in building a feature-rich social media site, go for WordPress. It is one of the most amazing uses of WordPress. Its stunning CMS is unbeatable. And you can build sites as good as Facebook or Reddit etc. It can just make the process a lot easier.
To set up a social media network, you would have to download a WordPress Plugin called BuddyPress. It would allow you to connect a community page with ease and would provide all the necessary features of a community or social media. It has direct messaging, activity stream, user groups, extended profiles, and so much more. You just have to download and configure it.
If BuddyPress doesn’t meet all your needs, don’t give up on your dreams. You can try out WP Symposium or PeepSo. There are also several themes you can use to build a social network.

3. Create A Forum For Your Brand’s Community
Communities are very important for your business. They help you stay in constant connection with your users and consumers. And allow you to turn them into a loyal customer base. Meanwhile, there are many good technologies that can be used for building a community page – the good old WordPress is still the best.
It is the best community development technology. If you want to build your online community, you need to consider all the amazing features you get with WordPress. Plugins such as BB Press is an open-source, template-driven PHP/ MySQL forum software. It is very simple and doesn’t hamper the experience of the website.
Other tools such as wpFoRo and Asgaros Forum are equally good for creating a community blog. They are lightweight tools that are easy to manage and integrate with your WordPress site easily. However, there is only one tiny problem; you need to have some technical knowledge to build a WordPress Community blog page.

4. Shortcodes
Since we gave you a problem in the previous section, we would also give you a perfect solution for it. You might not know to code, but you have shortcodes. Shortcodes help you execute functions without having to code. It is an easy way to build an amazing website, add new features, customize plugins easily. They are short lines of code, and rather than memorizing multiple lines; you can have zero technical knowledge and start building a feature-rich website or application.
There are also plugins like Shortcoder, Shortcodes Ultimate, and the Basics available on WordPress that can be used, and you would not even have to remember the shortcodes.

5. Build Online Stores
If you still think about why to use WordPress, use it to build an online store. You can start selling your goods online and start selling. It is an affordable technology that helps you build a feature-rich eCommerce store with WordPress.
WooCommerce is an extension of WordPress and is one of the most used eCommerce solutions. WooCommerce holds a 28% share of the global market and is one of the best ways to set up an online store. It allows you to build user-friendly and professional online stores and has thousands of free and paid extensions. Moreover as an open-source platform, and you don’t have to pay for the license.
Apart from WooCommerce, there are Easy Digital Downloads, iThemes Exchange, Shopify eCommerce plugin, and so much more available.

6. Security Features
WordPress takes security very seriously. It offers tons of external solutions that help you in safeguarding your WordPress site. While there is no way to ensure 100% security, it provides regular updates with security patches and provides several plugins to help with backups, two-factor authorization, and more.
By choosing hosting providers like WP Engine, you can improve the security of the website. It helps in threat detection, manage patching and updates, and internal security audits for the customers, and so much more.

Read More

#use of wordpress #use wordpress for business website #use wordpress for website #what is use of wordpress #why use wordpress #why use wordpress to build a website