Solving Problem with count using for each
- Refer Here for official docs
- Refer Here for the fix with toset and foreach
- Refer Here for using for each with
map(object)
Immutable Infrastructure
- when there is any change needed to be done in infra change template not infra.
- Every change needs to be version controlled.
Provisioners
- Refer Here for provisioners
- Terraform recommends using cloud-init custom data or user-date instead of provisioners if possible Refer Here
- Refer Here for the chagnes
- Refer Here for the changes done in azure to create vm with custom_data
Terraform provisioners
- Terraform has two kinds of provisioners
- local-exec: This executes on the machine where terraform apply is executed
- remote-exec: This executes on the remote machine generally the machine created
- file provisioner: which is used to copy file from local to remote
- For remote provisoners and file provisoners copying into remote we need connections to be managed Refer Here
- we can specify when to do provisioning
- during create
- during destroy
- Refer Here for provisioner in azure
- Refer Here for the changes done to perform provisioning in aws
- Terraform taint is used to mark a resource for recreation during next apply
-
When we want to change the script every time to make it work, we should be taiting
terraform taint <resourcetype>.<resourcename> -
To solve this problem we use
null_resourceRefer Here - Refer Here for the usage of null resource in terraform aws example and Refer Here for changes in terraform azure example
Building Reusable templates in Terraform using Modules
- Refer Here for the template which can create vpc with public and private subnets
- Now we want to make that reusable.
- To do that we need to create modules Refer Here
- Terraform modules has
- inputs
- resources
- outputs
- Group them and this becomes module
- Refer Here for module demo
- Terraform registry hosts lot of community modules Refer Here
- Refer Here for sample aws vpc communityt module
- Possible module sources Refer Here
