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Pigsty has an entire infrastructure stack as an enclosure of HA PostgreSQL clusters, BUT it is viable to install only the PostgreSQL components without the rest of the stack. This is called a slim installation.

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Overview

The slim installation focus on Pure HA-PostgreSQL Cluster, and it only installs essential components for this purpose. There’s NO Infra modules, No monitoring, No local repo Just partial of NODE module, along with ETCD & PGSQL modules Systemd Service Installed in this mode:
  • patroni: REQUIRED, bootstrap HA PostgreSQL cluster
  • etcd: REQUIRED, DCS for patroni
  • pgbouncer: OPTIONAL, connection pooler for postgres
  • vip-manager: OPTIONAL, if you want to use a L2 VIP bind to primary
  • haproxy: OPTIONAL, if you wish to auto-routing service
  • chronyd: OPTIONAL, if you wish to sync time with NTP server
  • tuned: OPTIONAL, manage node template and kernel parameters
You can turn off the optional components, the only two essential components are patroni and etcd.

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Configure

To perform a slim installation, you need to disable some switches in the pigsty.yml config file: 
all:
  children:

    # actually not used
    infra: { hosts: { 10.10.10.10: { infra_seq: 1 } } }

    # etcd cluster for ha postgres, still required in minimal installation
    etcd: { hosts: { 10.10.10.10: { etcd_seq: 1 } }, vars: { etcd_cluster: etcd } }

    # postgres cluster 'pg-meta' with 2 instances
    pg-meta:
      hosts:
        10.10.10.10: { pg_seq: 1, pg_role: primary }
        10.10.10.11: { pg_seq: 2, pg_role: replica }
      vars:
        pg_cluster: pg-meta
        pg_databases: [ { name: meta ,baseline: cmdb.sql ,comment: pigsty meta database ,schemas: [ pigsty ] ,extensions: [ { name: vector }] } ]
        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 }
        node_crontab: [ '00 01 * * * postgres /pg/bin/pg-backup full' ] # make a full backup every 1am

  vars:                               # global parameters
    version: v3.2.0                   # pigsty version string
    admin_ip: 10.10.10.10             # admin node ip address
    region: default                   # upstream mirror region: default,china,europe
    node_tune: oltp                   # node tuning specs: oltp,olap,tiny,crit
    pg_conf: oltp.yml                 # pgsql tuning specs: {oltp,olap,tiny,crit}.yml

    # slim installation setup
    nginx_enabled: false              # nginx not exists
    dns_enabled: false                # dnsmasq not exists
    prometheus_enabled: false         # prometheus not exists
    grafana_enabled: false            # grafana not exists
    pg_exporter_enabled: false        # disable pg_exporter
    pgbouncer_exporter_enabled: false
    pg_vip_enabled: false

    #----------------------------------#
    # Repo, Node, Packages
    #----------------------------------#
    node_repo_modules: node,infra,pgsql # use node_repo_modules instead of repo_modules
    node_repo_remove: true            # remove existing node repo for node managed by pigsty?
    repo_packages: [                  # default packages to be downloaded (if `repo_packages` is not explicitly set)
      node-bootstrap, infra-package, infra-addons, node-package1, node-package2, pgsql-common #,docker
    ]
    repo_extra_packages: [            # default postgres packages to be downloaded
      pgsql-main
      #,pgsql-core,pgsql-time,pgsql-gis,pgsql-rag,pgsql-fts,pgsql-olap,pgsql-feat,pgsql-lang,pgsql-type,pgsql-func,pgsql-admin,pgsql-stat,pgsql-sec,pgsql-fdw,pgsql-sim,pgsql-etl,
      #,pg17-core,pg17-time,pg17-gis,pg17-rag,pg17-fts,pg17-olap,pg17-feat,pg17-lang,pg17-type,pg17-func,pg17-admin,pg17-stat,pg17-sec,pg17-fdw,pg17-sim,pg17-etl,
      #,pg16-core,pg16-time,pg16-gis,pg16-rag,pg16-fts,pg16-olap,pg16-feat,pg16-lang,pg16-type,pg16-func,pg16-admin,pg16-stat,pg16-sec,pg16-fdw,pg16-sim,pg16-etl,
    ]
And use the slim.yml instead of the install.yml playbook: 
./slim.yml