gocronv2-etcd-elector-example

A production environment replica of multiple instance job scheduling with leader and follower nodes, this example uses gocronv2 with gocron-etcd-elector with etcd cluster.

Usage

Clone this repo

git clone https://github.com/seriouspoop/gocron-etcd-elector-example.git

Build and run containers with

docker compose up --attach go-app

attach flag will only show logs for go-app service

Alternatively

docker compose up -d
docker compose logs -f go-app

You will see something like this on your console

go-app-1| go-app
go-app-2| go-app
go-app-3| go-app

The etcd elector will choose a leader and run scheduled jobs,

Only a leader is allowed to run jobs

go-app-[leader: any of 1/2/3]| Current instance is leader
go-app-[leader: any of 1/2/3]| executing job

Congratulations, you have your multiple instance gocron job schedulers with high availibility up and running

Testing

To test the fail over stop the container elected as leader

docker stop gocron-etcd-elector-example-go-app-[leader]

replace [leader] with the leader container number,

Example,

docker stop gocron-etcd-elector-example-go-app-1

Then observe the logs to see new leader election