Terraform

https://www.terraform.io/language/expressions/

• In case if you want to pass variable from command you can do it by

• terraform plan -var "username=NitishKumar"

• In case if you want to pass multiple values through cmd**

• terraform plan -var "username=NK" -var "xyz=NitishKumar"

• terraform apply

• terraform apply --auto-approve

• terraform destroy

• terraform destroy --target SOURCE_TYPE.localValue

• terraform plan

• terraform validate

• terraform refresh

• terraform show

• terraform output

• terraform console (for debugging)

• exit

• terraform fmt

• terraform providers

#TASK1-

• ssh-key -> first-key
• assign first key to newly created instance.
• create a security group
• assign that group to instance.

---

• terraform init
• value = file("${path.module}/file.txt") -to read the content of the file
• ssh -i id_rsa ubuntu@ip-address
• sudo -i
• apt-get update
• apt-get install nginx
• cd /var/www/html/
• echo "This is Nitish" > index.nginx-debian.html

---

#TASK 2-

• nginx install

• /var/www/html/index.nginx-debian.html -> This is Nitish

• terraform taint aws_security_group.my_security_group (to taint any resource)

• terraform graph | dot -Tpdf > graph.pdf #Graphviz should be installed in your system

---

WORKSPACE

• terraform workspace -help
• terraform plan --var-file dev-terraform.tfvars
• terraform workspace show
• terraform workspace new dev
• terraform workspace select dev
• terraform workspace list
• terraform workspace delete prod
• terraform apply --auto-approve --var-file dev-terraform.tfvars
• terraform workspace delete dev

---

MODULES

• terraform init
• The module installer supports installation from a number of different source types, as listed below. 1 Local paths 2 Terraform Registry 3 GitHub 4 Bitbucket 5 Generic Git, Mercurial repositories 6 HTTP URLs 6 S3 buckets 7 GCS buckets 8 Modules in Package Sub-directories
• URL requires of above sources in module source parameter.

AWS CLI

• aws configure
• /Users/nitishkumar/.aws
• cat credential
• Provided S3 Full Permission in IAM

Terraform Migrate Backend

• Comment out the backend section of code
• terraform init -migrate-state

Remote Backend State Locking using S3 and DynamoDB

• dynamodb_table = "nitish-table-tf"