Terraform 1 5

Terraform 1.5

This overview applies when the project's target Terraform version is at least 1.5.

Configuration and validation

• Top-level check blocks can continuously validate infrastructure independently of resource lifecycle operations. Each contains one or more assert blocks and may contain a scoped data source; failed checks warn without halting the operation.
• Configuration-driven import blocks make adoption of existing resources visible in plans. Terraform 1.5 requires a literal string for id; expression support arrives in Terraform 1.6.
• terraform plan -generate-config-out=PATH can generate initial resource configuration for import targets that have no resource block. Generated configuration requires review before apply.

import {
  to = aws_s3_bucket.logs
  id = "company-logs"
}

Functions and operations

• plantimestamp() returns a stable timestamp selected during planning, unlike timestamp(), whose result is determined during apply.
• strcontains(string, substring) tests whether a string contains a substring.
• Local apply operations periodically persist state snapshots and attempt another snapshot after an interrupt, reducing the potential loss window during an aborted apply.

Compatibility

• Terraform 1.5 is the final minor series supporting macOS 10.13 and 10.14 and legacy Windows versions older than Windows 10 or Windows Server 2016.