Heartbeat

Dead simple Redis based heartbeat service written in Go which uses less than 1MB of RAM.

By default every second, heartbeat will send a Redis PUBLISH command to a specified channel.

Development

git clone git://github.com/catkins/heartbeat $GOPATH/src/catkins/heartbeat
cd $GOPATH/src/catkins/heartbeat

# fetch dependencies
go get github.com/joho/godotenv
go get gopkg.in/redis.v2

# start the service
go run heartbeat.go

# or build it and you're away
go build
./heartbeat

# add some more info to the heartbeat message with go templates
HEARTBEAT_MESSAGE="$(hostname) - {{.Timestamp}}" ./heartbeat

Debugging messages

Start the app, then in another shell watch whats happening in your redis server

redis-cli MONITOR

Environment Variables

This app uses environment variables to override configuration through godotenv.

Redis Connection

• REDIS_URL (defaults to "localhost:6379")
• REDIS_PASSWORD (defaults to "")
• REDIS_DATABASE which redis database to connect to (defaults to "0")

App settings

• HEARTBEAT_CHANNEL channel to publish heartbeats to (defaults to "heartbeat")
• HEARTBEAT_MESSAGE message to publish as a heartbeats as a Go Template (defaults to just sending the current unix timestamp)
• HEARTBEAT_INTERVAL in seconds (defaults to "1")

TODO

• Write tests
• Support dynamic messages using Go Templates
• Add debug flag