https://github.com/loshz/elasticipd

AWS Elastic IP association daemon
https://github.com/loshz/elasticipd

aws ec2 elasticip k8s kubernetes

Last synced: 25 days ago
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AWS Elastic IP association daemon

• Host: GitHub
• URL: https://github.com/loshz/elasticipd
• Owner: loshz
• License: mit
• Created: 2018-05-12T10:37:14.000Z (over 6 years ago)
• Default Branch: main
• Last Pushed: 2024-03-26T14:52:25.000Z (8 months ago)
• Last Synced: 2024-06-19T20:52:18.444Z (5 months ago)
• Topics: aws, ec2, elasticip, k8s, kubernetes
• Language: Go
• Homepage:
• Size: 763 KB
• Stars: 5
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# elasticipd

[![Build Status](https://github.com/loshz/elasticipd/workflows/ci/badge.svg)](https://github.com/loshz/elasticipd/actions) [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE) [![ghcr.io](https://img.shields.io/badge/container-ghcr.io-red)](https://github.com/users/loshz/packages/container/package/elasticipd)

As it is now common practice to run applications on top of a container-orchestration platforms, such as Kubernetes, there is no guarantee that a service will always run on the same host. This can cause problems when a service requiring a public IP address gets rescheduled.

`elasticipd` automatically associates an [Elastic IP](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html) address to the AWS EC2 instance running this service. It is designed to run as a sidecar container alongisde a service that requires a public IP address.

## Usage

As `elasticipd` is currently configured to use AWS [Instance Roles](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html), the host will need to have and EC2 Policy with at least the following actions: `DescribeInstances`, `DescribeInstanceAttribute`, `AssociateAddress` and `DisassociateAddress`.

The service is configured by setting the following command line flags:

```

Usage of elasticipd:

  -elastic-ip string

        Elastic IP address to associate

  -interval string

        Attempt association every interval (default "30s")

  -port int

        Local HTTP server port (default 8081)

  -reassoc

        Allow Elastic IP to be reassociated without failure (default true)

  -region string

        AWS region hosting the Elastic IP and EC2 instance

  -retries int

        Maximum number of association retries before fatally exiting (default 3)

```

### Kubernetes

A simple multi-container Pod spec:

```yaml

apiVersion: v1

kind: Pod

metadata:

  name: public-service

spec:

  containers:

  - name: public-service

    image: public-service

  - name: elasticipd

    image: ghcr.io/loshz/elasticipd:v2.3.0

    command: ["elasticipd"]

    args: [

        "-elastic-ip=",

        "-region=us-west-2",

        "-interval=10s"

    ]

    ports:

    - containerPort: 8081

      name: local-http

    livenessProbe:

      httpGet:

        path: /healthz

        port: local-http

      initialDelaySeconds: 3

      periodSeconds: 3

```