lelastic

what is lelastic

lelastic is a elastic IP client designed to make the use of elastic IPs as easy as possible it does not need any configuration dependencies or advanced bgp skills

caveats

this tool is completely optional and any bgp client/daemon of your choice will do the job.
the sole purpose of this tool is to get you up and running as fast and easy as possible
it does not support any fancy or advanced bgp trickery

notes

lelastic is basically a wrapper for gobgp (https://github.com/osrg/gobgp)
lelastic when started up exposes the gobgp API, just like gobgp does on port 50051
- since version 0.0.6 this is bound to localhost only. prior to this it was actually exposed

how it works

a few assumptions are made by this tool:

your elastic IP needs to be configured on "lo" interface
for ipv4 you need to configure the IP as a /32 tied to the loopback interface
for ipv6 you can use any IP out of your /64 or /56 and of any subnet size as a loopback IP. if you want to announce your subnet as a /56 you need to toggle the flag -send56 otherwise it will default to announcing a /64

install:

version=v0.0.6
curl -LO https://github.com/linode/lelastic/releases/download/$version/lelastic.gz
gunzip lelastic.gz
chmod 755 lelastic
mv lelastic /usr/local/bin/

containerizing:

You can containzerize lelastic using Docker and push it to a registry. Use this approach if you'd like to use lelastic in a kubernetes cluster.

First, be on a Linux machine or a Linode.
Build the container: cd lelastic && docker build -t lelastic .
Tag the container: docker tag lelastic your-name-here/lelastic:latest
Optionally run on your machine to test it first: docker run -dp 3000:3000 lelastic
Push it to a registry for your kubernetes cluster to pull from later: docker push your-name-here/lelastic:latest

usage:

Usage of ./lelastic:
  -dcid int
        dcid for your DC
  -logjson
        set log format to json
  -loglevel string
        set log level: trace, debug, info or warn (default "info")
  -primary
        advertise as primary
  -secondary
        advertise as secondary
  -send56
        Advertise ipv6 as /56 subnet (defaults to /64)

example:

to annnounce the linode as primary simply run

./lelastic -dcid 10 -primary

to annnounce the linode as secondary simply run

./lelastic -dcid 10 -secondary

to annnounce the IPv6 on your loopback as a /56 subnet

./lelastic -dcid 10 -primary -send56

ericsund/lelastic