mysql

OpenHalo kernel, provides MySQL protocol and syntax compatibility

The mysql configuration template uses OpenHalo database kernel instead of native PostgreSQL, providing MySQL wire protocol and SQL syntax compatibility.

Overview

  • Config Name: mysql
  • Node Count: Single node
  • Description: OpenHalo MySQL-compatible kernel configuration
  • OS Distro: el8, el9, el10, d12, d13, u22, u24
  • OS Arch: x86_64
  • Related: meta

Usage:

./configure -c mysql [-i <primary_ip>]

Content

Source: pigsty/conf/mysql.yml

---
#==============================================================#
# File      :   mysql.yml
# Desc      :   1-node OpenHaloDB (MySQL Compatible) template
# Ctime     :   2025-04-03
# Mtime     :   2025-12-28
# Docs      :   https://doc.pgsty.com/config
# License   :   Apache-2.0 @ https://pigsty.io/docs/about/license/
# Copyright :   2018-2026  Ruohang Feng / Vonng ([email protected])
#==============================================================#

# This is the config template for OpenHalo PG Kernel,
# Which is a PostgreSQL 14 fork with MySQL Wire Compatibility
# tutorial: https://doc.pgsty.com/pgsql/kernel/openhalo
#
# Usage:
#   curl https://repo.pigsty.io/get | bash
#   ./configure -c mysql
#   ./deploy.yml

all:
  children:
    infra: { hosts: { 10.10.10.10: { infra_seq: 1 }} ,vars: { repo_enabled: false }}
    etcd:  { hosts: { 10.10.10.10: { etcd_seq: 1  }} ,vars: { etcd_cluster: etcd  }}
    #minio: { hosts: { 10.10.10.10: { minio_seq: 1 }} ,vars: { minio_cluster: minio }}

    #----------------------------------------------#
    # OpenHalo Database Cluster
    #----------------------------------------------#
    # connect with mysql client: mysql -h 10.10.10.10 -u dbuser_meta -D mysql (the actual database is 'postgres', and 'mysql' is a schema)
    pg-meta:
      hosts:
        10.10.10.10: { pg_seq: 1, pg_role: primary }
      vars:
        pg_cluster: pg-meta
        pg_users:
          - {name: dbuser_meta ,password: DBUser.Meta   ,pgbouncer: true ,roles: [dbrole_admin]    ,comment: pigsty admin user }
          - {name: dbuser_view ,password: DBUser.Viewer ,pgbouncer: true ,roles: [dbrole_readonly] ,comment: read-only viewer for meta database }
        pg_databases:
          - {name: postgres, extensions: [aux_mysql]} # the mysql compatible database
          - {name: meta ,baseline: cmdb.sql ,comment: pigsty meta database ,schemas: [pigsty]}
        pg_hba_rules:
          - {user: dbuser_view , db: all ,addr: infra ,auth: pwd ,title: 'allow grafana dashboard access cmdb from infra nodes'}
        node_crontab: [ '00 01 * * * postgres /pg/bin/pg-backup full' ] # make a full backup every 1am

        # OpenHalo Ad Hoc Setting
        pg_mode: mysql                    # MySQL Compatible Mode by HaloDB
        pg_version: 14                    # The current HaloDB is compatible with PG Major Version 14
        pg_packages: [ openhalodb, pgsql-common ]  # install openhalodb instead of postgresql kernel

  vars:
    #----------------------------------------------#
    # INFRA : https://doc.pgsty.com/infra/param
    #----------------------------------------------#
    version: v4.0.0                   # pigsty version string
    admin_ip: 10.10.10.10             # admin node ip address
    region: default                   # upstream mirror region: default,china,europe
    infra_portal:                     # infra services exposed via portal
      home : { domain: i.pigsty }     # default domain name

    #----------------------------------------------#
    # NODE : https://doc.pgsty.com/node/param
    #----------------------------------------------#
    nodename_overwrite: false           # do not overwrite node hostname on single node mode
    node_repo_modules: node,infra,pgsql # add these repos directly to the singleton node
    node_tune: oltp                     # node tuning specs: oltp,olap,tiny,crit

    #----------------------------------------------#
    # PGSQL : https://doc.pgsty.com/pgsql/param
    #----------------------------------------------#
    pg_version: 14                      # OpenHalo is compatible with PG 14
    pg_conf: oltp.yml                   # pgsql tuning specs: {oltp,olap,tiny,crit}.yml

    #----------------------------------------------#
    # PASSWORD : https://doc.pgsty.com/config/security
    #----------------------------------------------#
    grafana_admin_password: pigsty
    grafana_view_password: DBUser.Viewer
    pg_admin_password: DBUser.DBA
    pg_monitor_password: DBUser.Monitor
    pg_replication_password: DBUser.Replicator
    patroni_password: Patroni.API
    haproxy_admin_password: pigsty
    minio_secret_key: S3User.MinIO
    etcd_root_password: Etcd.Root
...

Explanation

The mysql template uses the OpenHalo kernel, allowing you to connect to PostgreSQL using MySQL client tools.

Key Features:

  • Uses MySQL protocol (port 3306), compatible with MySQL clients
  • Supports a subset of MySQL SQL syntax
  • Retains PostgreSQL’s ACID properties and storage engine
  • Supports both PostgreSQL and MySQL protocol connections simultaneously

Connection Methods:

# Using MySQL client
mysql -h 10.10.10.10 -P 3306 -u dbuser_meta -pDBUser.Meta

# Also retains PostgreSQL connection capability
psql postgres://dbuser_meta:[email protected]:5432/meta

Use Cases:

  • Migrating from MySQL to PostgreSQL
  • Applications needing to support both MySQL and PostgreSQL clients
  • Leveraging PostgreSQL ecosystem while maintaining MySQL compatibility

Notes:

  • OpenHalo is based on PostgreSQL 14, does not support higher version features
  • Some MySQL syntax may have compatibility differences
  • Only supports EL8/EL9 systems
  • ARM64 architecture not supported

Last Modified 2026-01-09: add supabase asciinema demo (693cfa8)