kombinat

Kombinat

🙈 A first try to curate Auto Scaling with CoreOS in AWS.

We will curate many things in the months to come, but right now, there are these things.

• etcd
• EC2 Peers

Features

etcd

We curate the etcd cluster members, but removing members that are unreachable, because related AutoScaling instances have vanished.

Please, keep in mind the (N+1)/2 limit of scaling members of an etcd cluster

Get Started

Setup

Setting up the needed deps and restore the relevant dependencies.

make deps && make restore

Build the project and see view the produced binaries.

make build && ls -l ./bin

There is also a Dockerfile included, which allows to run kombinat in a container with Supervisord

The docker has to be on the host net docker run --rm --network host -d pixelmilk/kombinat

EC2 IAM Policy

We may mention the ec2-metadata project, which allows to test the Instance Metadata and User Data Service 😁

Beside the need to access the to Instance Metadata and User Data Service we need an IAM Role with the following IAM Policy for the EC2 Instances in the AutoScaling Groups.

{
  "Version": "2012-10-17",
  "Statement": [
      {
          "Effect": "Allow",
          "Action": "ec2:Describe*",
          "Resource": "*"
      },
      {
          "Effect": "Allow",
          "Action": "elasticloadbalancing:Describe*",
          "Resource": "*"
      },
      {
          "Effect": "Allow",
          "Action": [
              "cloudwatch:ListMetrics",
              "cloudwatch:GetMetricStatistics",
              "cloudwatch:Describe*"
          ],
          "Resource": "*"
      },
      {
          "Effect": "Allow",
          "Action": "autoscaling:Describe*",
          "Resource": "*"
      }
  ]
}

This policy allows to read the state of the AutoScaling Groups and the related EC2 instances.

License

MIT