Description

This is a light proxy which checks locally cluster (mariadb, percona, mysql, rabbitmq) and returns http code based on current status:

• 200 - Everything is fine. Node in cluster
• 503 - Node is out of sync

Intention of this service is to check consistency of a cluster.
If node gets another state but synced, this daemon will return 5xx to a http request from haproxy, keepalived or another service.
This will let you to exclude node from LBpool.

Usage

• Edit configuration file /etc/clusterhc/clusterhc.toml
• Run service
• Connect configure your LBpool to check localBind/(galera|rabbimq)

Installation

• Install go https://golang.org/doc/install
• Make a proper structure of directories: mkdir -p /opt/go/src /opt/go/bin /opt/go/pkg
• Setup g GOPATH variable: export GOPATH=/opt/go
• Clone this project to src: go get github.com/leoleovich/clusterhc
• Fetch dependencies: cd /opt/go/github.com/leoleovich/clusterhc && go get ./...
• Compile project: go install github.com/leoleovich/clusterhc
• Copy config file: mkdir /etc/clusterhc && cp /opt/go/src/github.com/leoleovich/clusterhc/clusterhc.toml /etc/clusterhc/
• Run it /opt/go/bin/clusterhc

Optional systemd service

• Create systemd service: cp /opt/go/src/github.com/leoleovich/clusterhc/clusterhc.service /usr/lib/systemd/system
• Reload systemd: systemctl daemon-reload
• Start clusterhc service: systemctl start clusterhc.service
• Check status: systemctl status clusterhc.service