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Configuration for AWS

Setting up Access to AWS API

nginx-asg-sync uses the AWS API to get the list of IP addresses of the instances of an Auto Scaling group. To access the AWS API, nginx-asg-sync must have credentials. To provide credentials to nginx-asg-sync:

  1. Create an IAM role and attach the predefined AmazonEC2ReadOnlyAccess policy to it. This policy allows read-only access to EC2 APIs.
  2. When you launch the NGINX Plus instance, add this IAM role to the instance.

nginx-asg-sync Configuration

nginx-asg-sync is configured in /etc/nginx/config.yaml.

region: us-west-2
api_endpoint: http://127.0.0.1:8080/api
sync_interval_in_seconds: 5
cloud_provider: AWS
upstreams:
 - name: backend-one
   autoscaling_group: backend-one-group
   port: 80
   kind: http
   max_conns: 0
   max_fails: 1
   fail_timeout: 10s
   slow_start: 0s
 - name: backend-two
   autoscaling_group: backend-two-group
   port: 80
   kind: http
   max_conns: 0
   max_fails: 1
   fail_timeout: 10s
   slow_start: 0s
   in_service: true
  • The api_endpoint key defines the NGINX Plus API endpoint.
  • The sync_interval_in_seconds key defines the synchronization interval: nginx-asg-sync checks for scaling updates every 5 seconds.
  • The cloud_provider key defines a cloud provider that will be used. The default is AWS. This means the key can be empty if using AWS. Possible values are: AWS, Azure.
  • The region key defines the AWS region where we deploy NGINX Plus and the Auto Scaling groups. Setting region to self will use the EC2 Metadata service to retrieve the region of the current instance.
  • The upstreams key defines the list of upstream groups. For each upstream group we specify:
    • name – The name we specified for the upstream block in the NGINX Plus configuration.
    • autoscaling_group – The name of the corresponding Auto Scaling group. Use of wildcards is supported. For example, backend-*.
    • port – The port on which our backend applications are exposed.
    • kind – The protocol of the traffic NGINX Plus load balances to the backend application, here http. If the application uses TCP/UDP, specify stream instead.
    • max_conns – The maximum number of simultaneous active connections to an upstream server. Default value is 0, meaning there is no limit.
    • max_fails – The number of unsuccessful attempts to communicate with an upstream server that should happen in the duration set by the fail-timeout to consider the server unavailable. Default value is 1. The zero value disables the accounting of attempts.
    • fail_timeout – The time during which the specified number of unsuccessful attempts to communicate with an upstream server should happen to consider the server unavailable. Default value is 10s.
    • slow_start – The slow start allows an upstream server to gradually recover its weight from 0 to its nominal value after it has been recovered or became available or when the server becomes available after a period of time it was considered unavailable. By default, the slow start is disabled.
    • in_service – Use only instances that are in the InService state of the Lifecycle. Default value is false.