Install and configure a PostgreSQL high-availability cluster managed with repmgr. Add dependencies, extensions, databases and users. Works for standalone installations as well.
Tested with :
- Debian 10.x ✔️
- Ubuntu 18.04.x ✔️
- PostgreSQL HA
- Usefull commands to run after your first installation
- Register former primary as a standby node after automatic failover
- License
Python >=3.6 The role is compatible with Ansible >=2.10 but hasn't yet be tested with Ansible 3.x.
See ./requirements.txt for detailled dependencies used to develop the role.
Recommended, for each postgresql host
- Python3 in PATH
- Pip3 in PATH
- psycopg2-binary (itself requires libpq-dev apt-package)
You can take a look at prepare.yml to check out an example setup for Python 3.
ansible-galaxy install fidanf.postgresql_ha[pgcluster]
pgsql01 ansible_host=192.168.56.10 repmgr_node_id=1 repmgr_priority=3
pgsql02 ansible_host=192.168.56.11 repmgr_node_id=2 repmgr_priority=2
pgsql03 ansible_host=192.168.56.12 repmgr_node_id=3 repmgr_priority=1
Role default variables are split amongst two files :
In order to exactly figure out the purpose and valid values for each of these variables, do not hesitate to inspect all the Jinja templates in the templates directory. Original default configuration files are also included (.orig).
---
- hosts: pgcluster
gather_facts: yes
become: yes
roles:
- name: fidanf.postgresql_ha
vars:
# Required configuration items
repmgr_target_group: pgcluster
repmgr_master: pgsql01
repmgr_failover: automatic
repmgr_promote_command: /usr/bin/repmgr standby promote -f /etc/repmgr.conf --log-to-file
repmgr_follow_command: /usr/bin/repmgr standby follow -f /etc/repmgr.conf --log-to-file --upstream-node-id=%n
repmgr_monitoring_history: "yes"
repmgr_connection_check_type: query
repmgr_log_level: DEBUG
repmgr_reconnect_attempts: 2
repmgr_reconnect_interval: 10
# Basic settings
postgresql_version: 11
postgresql_cluster_name: main
postgresql_cluster_reset: false # TODO: Needs to be tested for repmgr
postgresql_listen_addresses: "*"
postgresql_port: 5432
postgresql_wal_level: "replica"
postgresql_max_wal_senders: 10
postgresql_max_replication_slots: 10
postgresql_wal_keep_segments: 100
postgresql_hot_standby: on
postgresql_archive_mode: on
postgresql_archive_command: "test ! -f /tmp/%f && cp %p /tmp/%f"
postgresql_ext_install_repmgr: yes
postgresql_shared_preload_libraries:
- repmgr
# postgresql logging
postgresql_log_checkpoints: on
postgresql_log_connections: on
postgresql_log_disconnections: on
postgresql_log_temp_files: 0
# pg_hba.conf
postgresql_pg_hba_custom:
- { type: "host", database: "all", user: "all", address: "192.168.56.0/24", method: "md5" }
- { type: "host", database: "replication", user: "{{ repmgr_user }}", address: "192.168.56.0/24", method: "trust" }
- { type: "host", database: "replication", user: "{{ repmgr_user }}", address: "127.0.0.1/32", method: "trust" }
- { type: "host", database: "{{ repmgr_database }}", user: "{{ repmgr_user }}", address: "127.0.0.1/32", method: "trust" }
- { type: "host", database: "{{ repmgr_database }}", user: "{{ repmgr_user }}", address: "192.168.56.0/32", method: "trust" }
# Databases
postgresql_databases:
- name: "{{ repmgr_database }}"
owner: "{{ repmgr_user }}"
encoding: "UTF-8"
- name: testdb
owner: admin
encoding: "UTF-8"
# Users
postgresql_users:
- name: "{{ repmgr_user }}"
pass: "{{ repmgr_password }}"
- name: admin
pass: secret # postgresql >=10 does not accept unencrypted passwords
encrypted: yes
# Roles
postgresql_user_privileges:
- name: "{{ repmgr_user }}"
db: "{{ repmgr_database }}"
priv: "ALL"
role_attr_flags: "SUPERUSER,REPLICATION"
- name: admin
db: testdb
role_attr_flags: "SUPERUSER"
ansible pgcluster -b --become-user postgres -m shell -a "repmgr cluster crosscheck"ansible pgcluster -b --become-user postgres -m shell -a "repmgr cluster show"ansible pgcluster -b --become-user postgres -m shell -a "repmgr node status"postgres@pgsql01:~$ pg_ctlcluster 11 main stop
postgres@pgsql01:~$ repmgr standby clone --force -h pgsql02 -U repmgr -d repmgr
postgres@pgsql01:~$ pg_ctlcluster 11 main start
postgres@pgsql01:~$ repmgr standby register --force
Or you may use the repmgr node rejoin with pg_rewind
repmgr node rejoin -d repmgr -U repmgr -h pgsql02 --verbose --force-rewind=/usr/lib/postgresql/11/bin/pg_rewindMIT / BSD
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