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setup_haproxy

This role is for installing and configuring HAProxy. HAProxy is a load balancer for PostgreSQL.

Requirements

Following are the requirements of this role.

  1. Ansible
  2. edb_devops.edb_postgres -> setup_repo role for setting the repository on the systems.

Role Variables

haproxy_port

Which port to listen on. Applies to both TCP and Unix sockets. Default: 5000

Example:

haproxy_port: 5000

haproxy_listen_address

Specifies a list of addresses where to listen for TCP connections. You may also use * meaning “listen on all addresses”. Addresses can be specified numerically (IPv4/IPv6) or by name. Default: *

Example:

haproxy_listen_address: "*"

haproxy_global_maxconn

The maxconn value that will be set in the global HAProxy configuration. Default: 100

Example:

haproxy_global_maxconn: "300"

haproxy_read_only_lb

If set to true, HAProxy will configure a backend to route read-only connections to replicas. Default: false

Example:

haproxy_read_only_lb: true

haproxy_replica_port

If haproxy_read_only_lb: true, the port HAProxy will listen to for read-only connections. Default: 5001

Example:

haproxy_replica_port: 5001

patroni_rest_api_port

The port of the REST API of the patroni cluster. Default: 8008

Example:

patroni_rest_api_port: 8008

Dependencies

This role does not have any dependencies, but packages repositories should have been configured beforehand with the setup_repo role.

Example Playbook

Hosts file content

HAProxy can be configured on any most node types. To configure HAProxy on a host, set haproxy_configure to true. If you would like a host to be included as a backend server to HAProxy, set haproxy: true and include the proxy_location of the proxy server the node is a part of.

In this example, HAProxy is being configured alongside PgBouncer for a Patroni cluster.

Content of the inventory.yml file:

---
all:
  children:
    pgbouncer:
      hosts:
        proxy1:
          ansible_host: xxx.xxx.xxx.xxx
          private_ip: xxx.xxx.xxx.xxx
          haproxy: true
          proxy_location: 'zone_1'
          haproxy_configure: true
    primary:
      hosts:
        primary1:
          ansible_host: xxx.xxx.xxx.xxx
          private_ip: xxx.xxx.xxx.xxx
          haproxy: true
          proxy_location: 'zone_1'
          etcd: true
          etcd_cluster_name: 'patroni-etcd'

How to include the setup_haproxy role in your Playbook

Below is an example of how to include the setup_haproxy role:

---
- hosts: all
  name: Deploy haproxy
  become: yes
  gather_facts: yes
  any_errors_fatal: true

  collections:
    - edb_devops.edb_postgres
  
  pre_tasks:
    - name: Initialize the user defined variables
      set_fact:
        pg_version: 15
        pg_type: "PG"

  roles:
    - role: setup_repo
      when: "'setup_repo' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"
    - role: install_dbserver
      when: "'install_dbserver' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"
    - role: setup_etcd
      when: "'setup_etcd' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"
    - role: setup_patroni
      when: "'setup_patroni' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"
    - role: setup_pgbouncer
      when: "'setup_pgbouncer' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"
    - role: setup_haproxy
      when: "'setup_haproxy' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"
    - role: manage_pgbouncer
      when: "'manage_pgbouncer' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"
    - role: manage_dbserver
      when: "'manage_dbserver' in lookup('edb_devops.edb_postgres.supported_roles', wantlist=True)"

Defining and adding variables is done in the set_fact of the pre_tasks.

All the variables are available at:

License

BSD

Author information

Author: