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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 /var/log/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