Flywheel is a HTTP proxy which starts and stops EC2 instances sitting behind it.
Other solutions stop and start instances on a schedule to reduce AWS EC2 costs. While this works well when resources are used regularly, it is less than ideal when resources are unused for weeks or months at a time.
Flywheel will automatically stop its instances when no requests have been received for a period of time.
Requests made while powered down will be served a "Currently powered down, click here to start" style page.
You will need to create a JSON configuration file for flywheel, see the Configuration section.
Then start the server: flywheel --config my-config.json --listen 0.0.0.0:80
idle-timeout (string) How long after last request before powering down. Uses golang duration format, e.g. 1d2h3m
healthcheck-interval (string) How often to poll the AWS SDK. Used to detect stopped/started. Uses golang duration format, e.g. 1d2h3m
endpoint (string) The hostname and optional :port of the webserver to proxy to
vhosts (object) For environments with more than one web server. A mapping of vhost hostname to endpoint hostname
instances (array) An array of instance ids which will be stopped and started
autoscaling (object) Contains sub-settings for autoscale groups to power down.
autoscaling/terminate (object) A mapping of autoscale group name to desired size. These groups will be scaled down to 0 instances when powered down.
autoscaling/stop (array) An array of autoscale group names. These groups will have their ReplaceUnhealthy process suspended, and the instances will be stopped.
{
"idle-timeout": "3h",
"healthcheck-interval": "30s",
"endpoint": "dev.example.com",
"aws_region": "ap-southeast-2",
"vhosts": {
"alt-site.example.com": "dev2.example.com"
},
"instances": [
"i-deadbeef",
"i-cafebabe",
],
"autoscaling": {
"terminate": {
"my-safe-scaling-group": 2
},
"stop": [
"my-unsafe-scaling-group"
]
}
}
- implement flowdock notifications
- dockerize the app
- create a single flywheel instance so you can share one setup for all