Incorrect availability zones reported for subnets in VPC #1422
Labels
awaiting-feedback
Blocked on input from the author
kind/bug
Some behavior is incorrect or out of spec
Comments
farra
added
kind/bug
|
This function appears to give me the correct results. def get_subnets_for_az2(vpc_id: pulumi.Input[str], target_az: str) -> pulumi.Output[list]:
"""
Get private subnets for a specific availability zone within a VPC.
Args:
vpc_id: The VPC ID to search in
target_az: Target availability zone
Returns:
pulumi.Output[list]: List of matching subnet IDs
"""
def get_matching_subnets(vid):
try:
# Query AWS for all subnets in the VPC and AZ
subnets = aws.ec2.get_subnets(
filters=[
{
"name": "vpc-id",
"values": [vid]
},
{
"name": "availability-zone",
"values": [target_az]
},
# Filter for private subnets by checking map_public_ip_on_launch
{
"name": "map-public-ip-on-launch",
"values": ["false"]
}
]
)
pulumi.log.info(f"Found {len(subnets.ids)} subnets in AZ {target_az}")
return subnets.ids
except Exception as e:
pulumi.log.error(f"Error finding subnets: {str(e)}")
return []
return pulumi.Output.from_input(vpc_id).apply(get_matching_subnets) |
|
Hey @farra, I tried reproducing it with this minimal example but couldn't: from typing import Sequence
import pulumi
import pulumi_awsx as awsx
import pulumi_aws as aws
def filter_subnets(subnets: Sequence['aws.ec2.Subnet'], desired_az: str):
def filter_subnet(subnet: 'aws.ec2.Subnet'):
return subnet.availability_zone.apply(lambda az: subnet if az == desired_az else None)
filtered_subnets = [filter_subnet(net) for net in subnets]
return pulumi.Output.all(*filtered_subnets).apply(lambda args: [net for net in args if net is not None])
vpc = awsx.ec2.Vpc("test-vpc", enable_dns_hostnames=True, cidr_block="10.0.0.0/16")
pulumi.export('selected_nets', vpc.subnets.apply(lambda subnets: filter_subnets(subnets, "us-west-2a")).apply(lambda subnets: [net.id for net in subnets]))This exports the two subnets in the These are the versions I'm using: |
flostadler
added
awaiting-feedback
|
Hey @farra, were you able to try the program I posted above? |
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What happened?
Context
The motivation here is to set capacity reservations in the launch template. Capacity reservations are specific to an availability zone. When I set the subnet as part of the managed node group, I need to know that I'm using the assigned availability zone.
Issues
Pseudocode
Putting Outputs aside, I intended to write a function something like this:
Current Function
The current function takes an aws.ec2.Vpc and a dictionary of configuration from the pulumi config. That part isn't particularly relevant. This code has been written with some help from Claude and ChatGPT. I added logging to understand what was going on.
Output
When running
pulumi up, I get the following output:Yet, the AWS console reports that, for example,
subnet-049611835250f0802is inus-west-2anotus-west-2c.Example
This project gives the same results for me:
Output
Output of
pulumi aboutAdditional context
No response
Contributing
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