Rather than assuming a short sleep will work, we instead wait until netcat is listening of the socket. We've also configured the netcat listener to persist after the first connection, which allows Vault and us to check the connection without the process closing.
As we implemented this we also ran into AWS issues in us-east-1 and us-west-2, so we've changed our deploy regions until those issues are resolved.
Signed-off-by: Ryan Cragun <me@ryan.ec>
Add an updated `target_ec2_instances` module that is capable of
dynamically splitting target instances over subnet/az's that are
compatible with the AMI architecture and the associated instance type
for the architecture. Use the `target_ec2_instances` module where
necessary. Ensure that `raft` storage scenarios don't provision
unnecessary infrastructure with a new `target_ec2_shim` module.
After a lot of trial, the state of Ec2 spot instance capacity, their
associated APIs, and current support for different fleet types in AWS
Terraform provider, have proven to make using spot instances for
scenario targets too unreliable.
The current state of each method:
* `target_ec2_fleet`: unusable due to the fact that the `instant` type
does not guarantee fulfillment of either `spot` or `on-demand`
instance request types. The module does support both `on-demand` and
`spot` request types and is capable of bidding across a maximum of
four availability zones, which makes it an attractive choice if the
`instant` type would always fulfill requests. Perhaps a `request` type
with `wait_for_fulfillment` option like `aws_spot_fleet_request` would
make it more viable for future consideration.
* `target_ec2_spot_fleet`: more reliable if bidding for target instances
that have capacity in the chosen zone. Issues in the AWS provider
prevent us from bidding across multiple zones succesfully. Over the
last 2-3 months target capacity for the instance types we'd prefer to
use has dropped dramatically and the price is near-or-at on-demand.
The volatility for nearly no cost savings means we should put this
option on the shelf for now.
* `target_ec2_instances`: the most reliable method we've got. It is now
capable of automatically determing which subnets and availability
zones to provision targets in and has been updated to be usable for
both Vault and Consul targets. By default we use the cheapest medium
instance types that we've found are reliable to test vault.
* Update .gitignore
* enos/modules/create_vpc: create a subnet for every availability zone
* enos/modules/target_ec2_fleet: bid across the maximum of four
availability zones for targets
* enos/modules/target_ec2_spot_fleet: attempt to make the spot fleet bid
across more availability zones for targets
* enos/modules/target_ec2_instances: create module to use
ec2:RunInstances for scenario targets
* enos/modules/target_ec2_shim: create shim module to satisfy the
target module interface
* enos/scenarios: use target_ec2_shim for backend targets on raft
storage scenarios
* enos/modules/az_finder: remove unsed module
Signed-off-by: Ryan Cragun <me@ryan.ec>
Co-authored-by: Ryan Cragun <me@ryan.ec>
Ryan Cragun