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If Terraform ignored a security-group or firewall attribute, its normal plan may not propose updating that attribute—even when the live rule no longer matches the configuration. First identify the exact resource and ignored attribute, then compare the configured rule, the live rule, and the plan. Decide whether the external change is intended: update code to keep it, or restore the remote rule to match code.
How can ignore_changes hide a firewall rule change?
Terraform’s lifecycle.ignore_changes tells Terraform to consider specified resource arguments when creating an object but ignore them when planning updates. The effect is limited to the attribute or attributes named; it does not mean Terraform stopped refreshing every field on the resource. See HashiCorp’s lifecycle meta-argument reference.
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If the ignored attribute represents security-group ingress or another firewall rule, a change made outside Terraform may therefore be absent from the expected update plan. That is an application of the documented attribute behavior, not a guarantee about every provider, resource, or address: inspect the exact resource type and ignored attribute in your configuration.
A narrow example might look like this:
resource "example_security_group" "app" {
# Other resource arguments...
ingress {
# Intended rule arguments...
}
lifecycle {
ignore_changes = [ingress]
}
}This is illustrative, not a provider-specific configuration recipe. Use the address Terraform expects for the actual resource and rule structure. Avoid broadening the ignore rule: the more security-relevant configuration it covers, the less a normal plan can tell you about changes to those attributes.
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What should you check first?
- Locate the precise ignore rule. Find the affected resource block and the exact entry in
ignore_changes. Record the Terraform resource address, provider and resource type, and Terraform and provider versions when documenting an incident; version-specific behavior cannot be inferred without them. - Read the intended configuration. Write down the expected protocol, port range, source CIDR or other rule fields from the configuration. Consider whether the rule matches the intended security posture.
- Inspect the live firewall rule. Use the provider’s relevant console, CLI, or other authoritative view to compare the remote rule field by field with the code. Identify who or what changed it if that information is available.
- Review Terraform’s view. Run a refresh-only plan and inspect the proposed state updates. HashiCorp describes
terraform plan -refresh-onlyas a way to review changes reflecting remote reality; it does not try to change infrastructure to match configuration. See Manage resource drift. - Review a normal plan after deciding what should happen. A refresh-only plan helps you review state; it does not decide whether the live rule is correct. Once you update code or restore the remote rule, run a normal plan and check whether its proposed changes match that decision.
How should you resolve the drift?
Choose based on the intended firewall policy and who should own the rule. HashiCorp’s drift guidance describes the two basic outcomes: accept the external change and update configuration, or manually resolve the drift by restoring the resource to the intended configuration. See HashiCorp’s drift workflow.
| Decision | What to do | What to verify |
|---|---|---|
| Keep the external change | Update the Terraform configuration to represent the approved live rule. | Confirm the rule is acceptable, code reflects it, and the normal plan will retain rather than undo the intended change. |
| Revert the external change | Restore the remote firewall rule to the approved configuration, or revise the ignore behavior so Terraform can manage that attribute. | Confirm the live rule matches the intended policy and review the normal plan before applying any proposed infrastructure changes. |
Before acting, consider four questions: does the live rule expose more than intended; should Terraform or another system own the rule; can your drift or policy checks see this exact attribute; and will a normal plan retain or revert the change? If an external process legitimately manages a field, document that ownership and assess the security risk of leaving it outside Terraform’s update control.
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Can drift checks still report an ignored attribute?
Do not assume every drift or policy tool treats ignored attributes the same way as a normal plan. HCP Terraform’s documented drift example evaluates security-group ingress, including public CIDRs such as 0.0.0.0/0, but HashiCorp cautions that drift detection reports only changes to attributes defined in configuration. Check whether the chosen assessment actually covers the attribute and resource in question. See Detect infrastructure drift and enforce policies.
That distinction matters: a policy check for a configured ingress rule is not proof that every externally changed, ignored field will be surfaced. Keep security-critical attributes explicitly configured where Terraform is intended to own them, and validate the scope of any drift detection or policy assessment you rely on.
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What does ignore_changes not do?
- It does not change creation behavior for the named arguments; the lifecycle reference says they are considered during creation and ignored during updates.
- It does not imply that all fields stop refreshing or that every drift check will report an ignored change in the same way.
- It is not a blanket protection against resource destruction. The lifecycle reference explains that
ignore_changes = allcan suppress update proposals while still allowing Terraform to create and destroy the resource.
HashiCorp also documents the shared-management use case for ignore_changes, such as allowing another process to manage selected attributes. Its resource lifecycle tutorial illustrates ignoring externally managed tags. The same mechanism warrants extra care when the ignored field controls network access.
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- 【Interfaces】The firewall pc has 4 * Intel I226 lan ports, 2 * USB3.0 ports, 1 * RS232COM port, 2 * HD port, 1 * DC port. Equipped with VESA mount, you can install the micro pc behind the monitor to save space.
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- 【RAM & Storage】The firewall router equipped with 8G DDR3 RAM, max support 8GB; 128GB mSATA SSD, up to 512GB. Not support HDD. Size:5.27 * 4.98 * 1.43 inches, Weigh:500g, small but powerful.
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