profile for Gajendra D Ambi on Stack Exchange, a network of free, community-driven Q&A sites

Tuesday, August 14, 2018

Deploying a postgresql database instance on aws with terraform

So I needed to get the postgresql instance deployed on aws with terraform. I know it is easier to get this done via aws cli or python boto3 but it is easier with terraform. It is supposed to be non coder friendly. You do however need to search a lot online and official github and documentation.


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provider "aws" {
  access_key = "ACCESS_KEY"
  secret_key = "SECRET_KEY"
  region     = "us-east-1"
}

resource "random_string" "password" {
  length = 30
  special = true
  number = true
  lower = true
  upper = true
}

resource "aws_db_instance" "default" {
  allocated_storage    = 10
  storage_type         = "gp2"
  engine               = "postgres"
  engine_version       = "9.5"
  instance_class       = "db.t2.micro"
  name                 = "postgres"
  username             = "postgres"
  password = "${random_string.password.result}"
}

line
1 you are telling hashicorp terraform about where this should be deployed.
2. access key which you can take it from aws console while you were creating the user
3. secret key which you can take it from aws console while you were creating the user
4. if you know aws then you know what it is. You can choose whatever region you want for this testing purpose though.
7-13. This is a terraform's feature to generate a random string and here we have used some parameters from https://www.terraform.io/docs/providers/random/r/string.html which basically creates a random string of 30 characters and it mandates that this string should contain special, numbers, lower case and upper case letters.
15-24. Here you are telling terraform about what resource to deploy. In our case it is "aws_db_instance".
23. Uses the password generated by the code from 7-13 for the psql instance.
Now I have got to change the provider to IBM cloud and use hashicorp's vault for credentials management. That will be another blog when I figure it out.

Thursday, August 9, 2018

Deploying an instance on AWS via terraform

So I am trying to explore terraform and how to deploy instances on cloud using terraform.
first follow this to configure aws cli on your windows
http://www.cloudishes.com/2017/12/amazon-aws-automation.html
Not mandatory but recommended.
 Refer my previous post on installing terraform on windows.
Now

provider "aws" {
  access_key = "<access_key?"
  secret_key = "<secret_key?"
  region = "ap-south-1"
}
resource "aws_instance" "example" {
  ami           = "ami-cce794a3"
  instance_type = "t2.micro"
}

create a aws.tf file and paste this code.
Run

terraform init
terraform apply
from the same directory and it might ask you to type yes for a plan. Do that and you are done. Now you can go see your instance on AWS and it is live.
you will notice that it keeps asking for a build plan every time you do this. Instead you can create a build-plan first and then apply that.

terraform plan -out build-plan
terraform apply build-plan




Wednesday, August 8, 2018

getting started with terraform

So the terraform installation instructions on their site are not straight forward. Here how I did it
Linux (VM) : CentOS 6

Download the binaries
https://www.terraform.io/downloads.html


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yum install -y zip unzip # install zip,unzip if not already present
unzip terraform_*.* # unzip terraform and cd into the zipped directory
echo $PATH # list the runtime path
mv terraform /usr/local/bin/ # move the terraform binary file to the runtime path
terraform -v # check the version of the terraform

windows

  • Download from https://www.terraform.io/downloads.html
  • unzip it.
  • create a terraform directory directly under C:/
  • then move the terraform.exe to the C:/terraform
  • launch our good old command window and run 'set PATH=%PATH%;C:\terraform'
  • Since we want it to be accessible via powershell to, go to environment variables and add the 'C:\terraform' to your PATH.
  • Run terraform -v
good luck.

Friday, July 27, 2018

Kubernetes on windows


  1. I hope you have enough rights on your windows machine to get started.
  2. Turn windows features on or off > disable hyper v;enable containers
  3. Install Virtualbox
  4. Search for ‘docker toolbox for windows’ and install it
  5. The usual method of installing kubernetes cli via powershell won’t work most of the times so install chocolatey

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Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))

     6. Install the kubernetes cli (kubectl)

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choco install kubernetes-cli

Run minikube now on your windows to get started and good luck.