chore(deps): update terraform cloudposse/security-group/aws to v0.4.0 #35
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This PR contains the following updates:
0.3.1
->0.4.0
Release Notes
cloudposse/terraform-aws-security-group
v0.4.0
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This release makes no attempt at backward compatibility with earlier versions.
It puts forth some new Cloud Posse standards. See details below.
As a major overhaul, it likely has bugs. It may have breaking changes in the near future as we discover design issues. However, the intention is to get this module stabilized and provide a consistent interface moving forward.
This module requires Terraform version 0.14 or later due to numerous issues in Terraform 0.13.
🚀 Enhancements
Overhaul Module to New Standards @Nuru (#17) (click to see details)
#### what - Input `use_name_prefix` replaced with `create_before_destroy`. Previously, `create_before_destroy` was always set to `true` but of course that fails if you are not using a name prefix, because the names must be unique. Now the name is automatically a prefix if `create_before_destroy` is `true` and not if it is not. - Input `security_group_enabled` renamed to `create_security_group`. Whether the security group is created or not, it will be enabled, and setting `security_group_enabled` to false does not disable the entire module, even though the module is named "security-group", which makes the old name terribly confusing. The new name is more descriptive. - Input `id` renamed to `target_security_group_id`. Again `id` by itself is too vague. Converted to list to conform to new standard pattern that optional inputs which are used in conditionals are passed as list elements. See [Hashicorp recommendation](https://togithub.com/hashicorp/terraform/issues/26755#issuecomment-719103775) - Added a `security_group_name` input, which, if set, will set the security group name. If not set, name will be derived from `null-label`. Because the security group name must be unique within an account, we should provide some way for people to set/override it other than forcing them to create a customized `null-label`. - As a convenience, added `rule_matrix` . Many of our modules allow users to simply give a list of security groups to allow access to the new resource, typically called `allowed_security_groups`. This variable allows for easy migration by closely paralleling the existing resource creation code. It allows any number of rules to be applied to any combined list of security groups and CIDRs. See [example](https://togithub.com/cloudposse/terraform-aws-security-group/blob/9cfe55a4572eaff6a89eefa760628e684665dda2/examples/complete/main.tf#L21-L43). - As a convenience, added `allow_all_egress`. AWS by default allows full egress to newly created security groups. Terraform removes this when taking over a security group, but our modules frequently want to restore it. Historically, though, the modules have implemented this slightly differently, and few or none have allowed IPv6 egress. Adding this boolean gives us a way to enable it simply and consistently (as opposed to every module writing its own egress rule). - Abandoned the attempt to create stable keys for `rules` to use in `for_each`. Existing generated keys were not guaranteed unique, and keys that were generated and guaranteed to be unique would not be known at plan time and thus could not be used. Instead, provide option for user to provide stable keys and, if not provided, generate keys knowing they might not be stable. #### why * This module is the foundation for how we'll handle security groups across all of our modules and we need to ensure greater consistency from the onset #### naming conventionsWe want to migrate to a consistent set of name across modules. However, it is also quite painful to be forced to rename, so where possible I would like to maintain existing names but mark them deprecated and feed them into the new names in
main.tf locals{}
. We have also already seen issues with the most recent set of name changes. Therefore I propose these names with these meanings:associated_security_group_ids
associated_security_group_ids
is a list of IDs of Security Group that are "associated" (AWS' term) with the resource being created. In other words, the new resource is placed in or becomes a member of the Security Groups identified by the ID.Most often our modules got this information as
existing_security_groups
and a booleanuse_existing_security_groups
, and the recent change was to call this input simplysecurity_groups
. However, there is no consistency in naming in the AWS provider (redshift_cluster calls itcluster_security_groups
, elasticache_replication_group calls itsecurity_group_ids
, ec2_instance calls it justsecurity_groups
but accepts legacy security group names as well as IDs) and in our modules we typically have several lists of security groups (see below), so just calling thissecurity_groups
is very confusing.Using "associated" makes it clear the purpose, and suffixing with "ids" makes it clear the type. Since AWS in inconsistent and variously uses ARNs, IDs, and Names to identify resources, I think including the type is very helpful.
allowed_security_group_ids
allowed_security_group_ids
are security groups that are allowed ingress to the resource being created. Typically rules allowing this are added to the single created security group, as it should be unnecessary for an existing security group, but where desired, these rules can be added to the first in the list of "associated" security groupsallow_all_egress
AWS by default creates security groups that allow no ingress but allow all egress. When Terraform starts managing rules for the security group, it removes this default egress rule. Modules should include an
allow_all_egress
boolean to restore that rule whentrue
.security_group_description
Our modules have evolved over time (at community request) to provide more useful descriptions of Security Groups. Unfortunately, Terraform cannot change the description of an existing security group; instead it must replace the SG with a new one with the new description. For this reason, changes to the description field, while beneficial for new users, can be too disruptive on existing infrastructure to be worth it. In order to provide users with control over the description and thus mitigate the impact of changes, all modules that create security groups should include a
security_group_description
input which, if set, overrides any other kind of generated or default description.Instance Metadata Services
Although not actually part of the Security Group module, since we are covering consistent naming of inputs, we document here that we are using the following inputs and defaults to configure the AWS Instance Metadata Service. Note that our inputs do not exactly match the Terraform resource inputs because we have chosen to use boolean inputs rather than string inputs to toggle features. Our standard
metadata_options
block looks like thisand defaults are
We picked these defaults so that we default to best security practices with a concession (hop limit 2 instead of 1) to running containerized services. However,
metadata_http_tokens_required = true
may break some existing applications and is a breaking change, so when implemented, it should be noted in the release notes, along with how to preserve the previous settings.Optional Inputs
This module is among the first to implement the new Cloud Posse standard for optional inputs in Terraform. Because of issues like this (just one of many, many examples) we are going to follow Hashicorp's advice and prohibit the conditional creation of resources based on values of inputs. If you want to condition the creation of a resource (e.g.
count = xxx ? 1 : 0
) based on whether the input is supplied or not, the way we are going to do it is to make the optional input a list. A supplied value will be in a list with 1 element. An omitted value will use the default list of 0 elements. It will remain standard practice to depend on the value ofenabled
, but otherwise we should avoid conditional creation of resources based on input values.Unfortunately, this also means we cannot use
for_each
when the values might be generated during apply. This appears to be a consequence of the fact thatfor_each
requires aset
and the cardinality of the set depends on the values generated (adding 2 of the same value to a set only increases the size of the set by 1). So we can only usefor_each
when we can guarantee the user is hard coding the values so they are all known an plan time. Otherwise usecount
.references
Issues with Terraform management of Security Group Rules: drift detection, cyclical dependencies, and competing for control: a post from a Hashicorp engineer
Bug in Terraform AWS provider requires multiple
apply
cycles to updateaws_elasticache_replication_group
security groups:Some problems with the previous version:
v0.3.3
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🤖 Automatic Updates
Update context.tf @cloudpossebot (#21)
#### what This is an auto-generated PR that updates the `context.tf` file to the latest version from `cloudposse/terraform-null-label` #### why To support all the features of the `context` interface.v0.3.2
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🚀 Enhancements
add missing required input (vpc_id) in the example @Zaargh (#20)
#### what * add missing required input `vpc_id` in the exampleConfiguration
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