unit-reloader

README

SQS Systemd unit reloader

This utility performs start|stop|restart on the given Systemd unit when it receives SQS message. See more details in the official AWS documentation.

AWS configuration

SQS queue configuration

Queue needs to be configured with the access policy that allows perform sqs:SendMessage to S3 bucket.

{
  "Version": "2008-10-17",
  "Id": "__default_policy_ID",
  "Statement": [
    {
      "Sid": "__owner_statement",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::123456789123:root"
      },
      "Action": "SQS:*",
      "Resource": "arn:aws:sqs:eu-west-1:123456789123:events"
    },
    {
      "Sid": "s3_notification",
      "Effect": "Allow",
      "Principal": {
        "Service": "s3.amazonaws.com"
      },
      "Action": "SQS:SendMessage",
      "Resource": "arn:aws:sqs:eu-west-1:123456789123:events",
      "Condition": {
        "StringEquals": {
          "aws:SourceAccount": "123456789123"
        },
        "ArnLike": {
          "aws:SourceArn": "arn:aws:s3:::unit-reloader-test"
        }
      }
    }
  ]
}

S3 bucket configuration

Create an event notification for the s3:ObjectCreated:Put and s3:ObjectCreated:Post events and set SQS qeue as the destination.

Example

AWS_PROFILE=personal ./main -queue-url='https://sqs.eu-west-1.amazonaws.com/123456789123/events' -unit=nginx.service -action=restart