main.yml

# file: postgresql/defaults/main.yml

# Basic settings
postgresql_version: 11
postgresql_version_terse: "{{ postgresql_version | replace('.', '') }}"  # Short version of the postgresql_version, used in some path and filenames
postgresql_encoding: "UTF-8"
postgresql_data_checksums: false
postgresql_pwfile: ""

postgresql_locale_parts:
  - "en_US" # Locale
  - "UTF-8" # Encoding
postgresql_locale: "{{ postgresql_locale_parts | join('.') }}"
postgresql_ctype_parts:
  - "en_US" # Locale
  - "UTF-8" # Encoding
postgresql_ctype: "{{ postgresql_ctype_parts | join('.') }}"

postgresql_env:
  LC_ALL: "{{ postgresql_locale }}"
  LC_LCTYPE: "{{ postgresql_locale }}"

postgresql_admin_user: "postgres"
postgresql_default_auth_method: "peer"
postgresql_default_auth_method_hosts: "md5"

# The user/group that will run postgresql process or service
postgresql_service_user: "{{ postgresql_admin_user }}"
postgresql_service_user_pgsql_profile: false
postgresql_service_group: "{{ postgresql_admin_user }}"
postgresql_service_enabled: true

postgresql_cluster_name: "main"
postgresql_cluster_reset: false

postgresql_database_owner: "{{ postgresql_admin_user }}"

# Extensions
postgresql_ext_install_contrib: no
postgresql_ext_install_dev_headers: no
postgresql_ext_install_postgis: no

postgresql_ext_postgis_version: "2.5" # be careful: check whether the postgresql/postgis versions work together

postgresql_ext_postgis_deps:
  - libgeos-c1
  - "postgresql-{{ postgresql_version }}-postgis-{{ postgresql_ext_postgis_version }}"
  - "postgresql-{{ postgresql_version }}-postgis-scripts"

# Foreign Data Wrapper(s)
postgresql_fdw_mysql: no
postgresql_fdw_ogr: no

# List of databases to be created (optional)
postgresql_databases: []

# List of database extensions to be created (optional)
postgresql_database_extensions: []

# List of users to be created (optional)
postgresql_users: []

# List of schemas to be created (optional)
postgresql_database_schemas: []

# List of user privileges to be applied (optional)
postgresql_user_privileges: []

# pg_hba.conf
postgresql_pg_hba_default:
  - { type: local, database: all, user: all, address: "",             method: "{{ postgresql_default_auth_method }}", comment: '"local" is for Unix domain socket connections only' }
  - { type: host,  database: all, user: all, address: "127.0.0.1/32", method: "{{ postgresql_default_auth_method_hosts }}", comment: "IPv4 local connections:" }
  - { type: host,  database: all, user: all, address: "::1/128",      method: "{{ postgresql_default_auth_method_hosts }}", comment: "IPv6 local connections:" }
  - { type: local, database: all, user: "{{ postgresql_admin_user }}", address: "", method: "peer map=root_as_{{ postgresql_admin_user }}", comment: "Local root Unix user, passwordless access" }

postgresql_pg_hba_md5_hosts: []
postgresql_pg_hba_passwd_hosts: []
postgresql_pg_hba_trust_hosts: []
postgresql_pg_hba_custom: []

# pg_ident.conf
postgresql_pg_ident:
  - comment: "root is allowed to login as {{ postgresql_admin_user }}"
    mapname: "root_as_{{ postgresql_admin_user }}"
    system_username: "{{ postgresql_admin_user }}"
    pg_username: "{{ postgresql_admin_user }}"

# postgresql.conf

#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------

# Location of postgres configuration files here
postgresql_conf_directory: "/etc/postgresql/{{ postgresql_version }}/{{ postgresql_cluster_name }}"
# HBA (Host Based Authentication) file
postgresql_hba_file: "{{ postgresql_conf_directory }}/pg_hba.conf"
# Ident configuration file
postgresql_ident_file: "{{ postgresql_conf_directory }}/pg_ident.conf"
# Use data in another directory
postgresql_varlib_directory_name: "postgresql"
postgresql_data_directory: "/var/lib/{{ postgresql_varlib_directory_name }}/{{ postgresql_version }}/{{ postgresql_cluster_name }}"
postgresql_wal_directory: ""
postgresql_pid_directory: "/var/run/postgresql"
# If external_pid_file is not explicitly set, on extra PID file is written
postgresql_external_pid_file: "{{ postgresql_pid_directory }}/{{ postgresql_version }}-{{ postgresql_cluster_name }}.pid"

#------------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#------------------------------------------------------------------------------

postgresql_listen_addresses:
  - "localhost"
postgresql_port: 5432

postgresql_max_connections: 100
postgresql_superuser_reserved_connections: 3

postgresql_unix_socket_directory: ""    # (<= 9.2)
postgresql_unix_socket_directories:     # (>= 9.3)
  - "{{ postgresql_pid_directory }}"
postgresql_unix_socket_group: ""
postgresql_unix_socket_permissions: "0777" # begin with 0 to use octal notation

postgresql_bonjour: off      # advertise server via Bonjour
postgresql_bonjour_name: ""  # defaults to the computer name


# - Security and Authentication -

postgresql_authentication_timeout: 60s
postgresql_ssl: off
postgresql_ssl_ciphers:
  - "DEFAULT"
  - "!LOW"
  - "!EXP"
  - "!MD5"
  - "@STRENGTH"
postgresql_ssl_prefer_server_ciphers: on
postgresql_ssl_ecdh_curve: "prime256v1"
postgresql_ssl_dh_params_file: ""                                   # (>= 10)  
postgresql_ssl_passphrase_command: ""                               # (>= 11)
postgresql_ssl_passphrase_command_supports_reload: off              # (>= 11)
postgresql_ssl_renegotiation_limit: 512MB                           # amount of data between renegotiations
postgresql_ssl_cert_file: "/etc/ssl/certs/ssl-cert-snakeoil.pem"    # (>= 9.2)
postgresql_ssl_key_file: "/etc/ssl/private/ssl-cert-snakeoil.key"   # (>= 9.2)
postgresql_ssl_ca_file: ""                                          # (>= 9.2)
postgresql_ssl_crl_file: ""                                         # (>= 9.2)
postgresql_password_encryption: on
postgresql_db_user_namespace: off
postgresql_row_security: off                                        # (>= 9.5)

# Kerberos and GSSAPI
postgresql_krb_server_keyfile: ""
postgresql_krb_srvname: "postgres" # (<= 9.3)
postgresql_krb_caseins_users: off

# TCP Keepalives, 0 selects the system default (in seconds)
postgresql_tcp_keepalives_idle: 0
postgresql_tcp_keepalives_interval: 0
postgresql_tcp_keepalives_count: 0


#------------------------------------------------------------------------------
# RESOURCE USAGE (except WAL)
#------------------------------------------------------------------------------

# - Memory -

postgresql_shared_buffers:       128MB # min 128kB
postgresql_huge_pages:           "try"   # on, off, or try
postgresql_temp_buffers:         8MB   # min 800kB

# Caution: it is not advisable to set max_prepared_transactions nonzero unless
# you actively intend to use prepared transactions.
postgresql_max_prepared_transactions: 0 # zero disables the feature

postgresql_work_mem:                   1MB      # min 64kB
postgresql_maintenance_work_mem:       16MB     # min 1MB
postgresql_replacement_sort_tuples:    150000   # (>= 9.6) limits use of replacement selection sort
postgresql_autovacuum_work_mem:        -1       # min 1MB, or -1 to use maintenance_work_mem
postgresql_max_stack_depth:            2MB      # min 100kB
postgresql_dynamic_shared_memory_type: "posix"  # the default is the first option
                                                # supported by the operating system:
                                                #   posix
                                                #   sysv
                                                #   windows
                                                #   mmap
                                                # use none to disable dynamic shared memory


# - Disk -

# limits per-process temp file space in kB, or -1 for no limit (>= 9.2)
postgresql_temp_file_limit: -1


# - Kernel Resource Usage -

postgresql_max_files_per_process: 1000  # min 25
postgresql_shared_preload_libraries: []


# - Cost-Based Vacuum Delay -

postgresql_vacuum_cost_delay:      0       # 0-100 milliseconds
postgresql_vacuum_cost_page_hit:   1       # 0-10000 credits
postgresql_vacuum_cost_page_miss:  10      # 0-10000 credits
postgresql_vacuum_cost_page_dirty: 20      # 0-10000 credits
postgresql_vacuum_cost_limit:      200     # 1-10000 credits


# - Background Writer -

postgresql_bgwriter_delay:          200ms  # 10-10000ms between rounds
postgresql_bgwriter_lru_maxpages:   100    # 0-1000 max buffers written/round
postgresql_bgwriter_lru_multiplier: 2.0    # 0-10.0 multiplier on buffers scanned/round
postgresql_bgwriter_flush_after:    0      # (>= 9.6) 0 disables,
                                           # default is 512kB on linux, 0 otherwise


# - Asynchronous Behavior -

postgresql_effective_io_concurrency:         1   # 1-1000; 0 disables prefetching
postgresql_max_worker_processes:             8   # (change requires restart)
postgresql_max_parallel_maintenance_workers: 2   # (>= 11) taken from max_parallel_workers
postgresql_max_parallel_workers_per_gather:  0   # (>= 9.6) taken from max_worker_processes
postgresql_parallel_leader_participation:    on  # (>= 11)
postgresql_max_parallel_workers:             8   # (>= 10)
postgresql_old_snapshot_threshold:           -1  # (>= 9.6) 1min-60d; -1 disables; 0 is immediate
                                                 # (change requires restart)
postgresql_backend_flush_after:              0   # (>= 9.6) 0 disables, default is 0


#------------------------------------------------------------------------------
# WRITE AHEAD LOG
#------------------------------------------------------------------------------

# - Settings -

postgresql_wal_level: "minimal"   # minimal, archive (<= 9.5), hot_standby (<= 9.5), replica (>= 9.6), or logical
postgresql_fsync:     on          # flush data to disk for crash safety
                                          # (turning this off can cause
                                          # unrecoverable data corruption)

# Synchronization level:
# - off
# - local
# - remote_write
# - remote_apply (>= 9.6)
# - on
postgresql_synchronous_commit: "on"

# The default is the first option supported by the operating system:
# - open_datasync
# - fdatasync (default on Linux)
# - fsync
# - fsync_writethrough
# - open_sync
postgresql_wal_sync_method: "fsync"

# recover from partial page writes
postgresql_full_page_writes: on
postgresql_wal_compression: off     # (>= 9.5)
postgresql_wal_log_hints: off       # also do full page writes of non-critical updates

postgresql_wal_buffers:            -1     # min 32kB, -1 sets based on shared_buffers
postgresql_wal_writer_delay:       200ms  # 1-10000 milliseconds
postgresql_wal_writer_flush_after: 1MB    # (>= 9.6) 0 disables
postgresql_commit_delay:           0      # range 0-100000, in microseconds
postgresql_commit_siblings:        5      # range 1-1000


# - Checkpoints -

postgresql_checkpoint_segments:          3     # (<= 9.4) in logfile segments, min 1, 16MB each
postgresql_max_wal_size:                 1GB   # (>= 9.5)
postgresql_min_wal_size:                 80MB  # (>= 9.5)
postgresql_checkpoint_flush_after:       0     # (>= 9.6) 0 disables,
                                               # default is 256kB on linux, 0 otherwise
postgresql_checkpoint_timeout:           5min  # range 30s-1d
postgresql_checkpoint_completion_target: 0.5   # checkpoint target duration, 0.0 - 1.0
postgresql_checkpoint_warning:           30s   # 0 disables


# - Archiving -

# allows archiving to be done
postgresql_archive_mode: "off"

# Command to use to archive a logfile segment.
# Placeholders: %p = path of file to archive
#               %f = file name only
# e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'
postgresql_archive_command: ""

# force a logfile segment switch after this
postgresql_archive_timeout: 0


#------------------------------------------------------------------------------
# REPLICATION
#------------------------------------------------------------------------------

# - Sending Server(s) -

# Set these on the master and on any standby that will send replication data.

# max number of walsender processes
postgresql_max_wal_senders: 0
postgresql_wal_sender_delay: 1s     # walsender cycle time, 1-10000 milliseconds (<= 9.1)

postgresql_wal_keep_segments:  0    # in logfile segments, 16MB each; 0 disables
postgresql_replication_timeout: 60s # in milliseconds; 0 disables (<= 9.2)
postgresql_wal_sender_timeout: 60s  # in milliseconds; 0 disables (>= 9.3)
postgresql_max_replication_slots: 0 # max number of replication slots

postgresql_track_commit_timestamp: off # (>= 9.5)

# - Master Server -

# These settings are ignored on a standby server.

# standby servers that provide sync rep.
# number of sync standbys (>= 9.6) and comma-separated list of application_name from standby(s)
postgresql_synchronous_standby_num_sync: "" # >= 9.6 (NOTE: If you use the ANY/ALL syntax in v10, then note the new variable below)
postgresql_synchronous_standby_choose_sync: "FIRST" # >= 10
postgresql_synchronous_standby_names: [] # '*' means 'all'

# number of xacts by which cleanup is delayed
postgresql_vacuum_defer_cleanup_age: 0


# - Standby Servers -

# "on" allows queries during recovery
postgresql_hot_standby: off
# max delay before canceling queries when reading WAL from archive
postgresql_max_standby_archive_delay: 30s # -1 allows indefinite delay
# max delay before canceling queries when reading streaming WAL;
postgresql_max_standby_streaming_delay: 30s # -1 allows indefinite delay
# send replies at least this often
postgresql_wal_receiver_status_interval: 10s # 0 disables
# send info from standby to prevent query conflicts
postgresql_hot_standby_feedback: off
#time that receiver waits for communication from master in milliseconds
postgresql_wal_receiver_timeout: 60s
# time to wait before retrying to retrieve WAL after a failed attempt
postgresql_wal_retrieve_retry_interval: 5s # (>= 9.5)

# - Subscribers - (>= 10) 

# These settings are ignored on a publisher.

postgresql_max_logical_replication_workers: 4   # (>= 10) taken from max_worker_processes
            # (change requires restart)
postgresql_max_sync_workers_per_subscription: 2 # (>= 10) taken from max_logical_replication_workers


#------------------------------------------------------------------------------
# QUERY TUNING
#------------------------------------------------------------------------------

# - Planner Method Configuration -

postgresql_enable_bitmapscan:              on
postgresql_enable_hashagg:                 on
postgresql_enable_hashjoin:                on
postgresql_enable_indexscan:               on
postgresql_enable_indexonlyscan:           on
postgresql_enable_material:                on
postgresql_enable_mergejoin:               on
postgresql_enable_nestloop:                on
postgresql_enable_parallel_append:         on    # (>= 11)
postgresql_enable_seqscan:                 on
postgresql_enable_sort:                    on
postgresql_enable_tidscan:                 on
postgresql_enable_partitionwise_join:      off   # (>= 11)
postgresql_enable_partitionwise_aggregate: off   # (>= 11)
postgresql_enable_parallel_hash:           on    # (>= 11)
postgresql_enable_partition_pruning:       on    # (>= 11)


# - Planner Cost Constants -

postgresql_seq_page_cost:              1.0     # measured on an arbitrary scale
postgresql_random_page_cost:           4.0     # same scale as above
postgresql_cpu_tuple_cost:             0.01    # same scale as above
postgresql_cpu_index_tuple_cost:       0.005   # same scale as above
postgresql_cpu_operator_cost:          0.0025  # same scale as above
postgresql_parallel_tuple_cost:        0.1     # same scale as above (>= 9.6)
postgresql_parallel_setup_cost:        1000.0  # same scale as above (>= 9.6)
postgresql_jit_above_cost:             100000  # perform JIT compilation if available
postgresql_jit_inline_above_cost:      500000  # inline small functions if query is
postgresql_jit_optimize_above_cost:    500000  # use expensive JIT optimizations if

postgresql_min_parallel_relation_size: 8MB     # (= 9.6) replaced by below two parameters in 10
postgresql_min_parallel_table_scan_size: 8MB   # (>= 10)
postgresql_min_parallel_index_scan_size: 512kB # (>= 10)
postgresql_effective_cache_size:       128MB


# - Genetic Query Optimizer -

postgresql_geqo:                       on
postgresql_geqo_threshold:             12
postgresql_geqo_effort:                5    # range 1-10
postgresql_geqo_pool_size:             0    # selects default based on effort
postgresql_geqo_generations:           0    # selects default based on effort
postgresql_geqo_selection_bias:        2.0  # range 1.5-2.0
postgresql_geqo_seed:                  0.0  # range 0.0-1.0


# - Other Planner Options -

postgresql_default_statistics_target:  100          # range 1-10000
postgresql_constraint_exclusion:       "partition"  # on, off, or partition
postgresql_cursor_tuple_fraction:      0.1          # range 0.0-1.0
postgresql_from_collapse_limit:        8
postgresql_join_collapse_limit:        8            # 1 disables collapsing of explicit
postgresql_force_parallel_mode:        off          # on, off, regress (>= 9.6)
postgresql_jit:                        off          # (>= 11)


#------------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#------------------------------------------------------------------------------

# - Where to Log -

# Valid values are combinations of stderr, csvlog, syslog, and eventlog.
# depending on platform. Csvlog requires logging_collector to be on.
postgresql_log_destination:            "stderr"

# Enable capturing of stderr and csvlog into log files.
# Required to be on for csvlogs.
postgresql_logging_collector:          off

# These are only used if logging_collector is on:

# Directory where log files are written, can be absolute or relative to PGDATA
postgresql_log_directory:              "pg_log"
# Log file name pattern, can include strftime() escapes
postgresql_log_filename:               "postgresql-%Y-%m-%d_%H%M%S.log"
postgresql_log_file_mode:              "0600" # begin with 0 to use octal notation
# If on, an existing log file with the same name as the new log file will be
# truncated rather than appended to. But such truncation only occurs on
# time-driven rotation, not on restarts or size-driven rotation. Default is
# off, meaning append to existing files in all cases.
postgresql_log_truncate_on_rotation:   off
# Automatic rotation of logfiles will happen after that time.
postgresql_log_rotation_age:           1d
# Automatic rotation of logfiles will happen after that much log output.
postgresql_log_rotation_size:          10MB

# These are relevant when logging to syslog:
postgresql_syslog_facility:            "LOCAL0"
postgresql_syslog_ident:               "postgres"
postgresql_syslog_sequence_numbers:    on         # (>= 9.6)
postgresql_syslog_split_messages:      on         # (>= 9.6)
# This is only relevant when logging to eventlog (win32) (>= 9.2):
postgresql_event_source:               "PostgreSQL"


# - When to Log -

# Values in order of decreasing detail:
# - debug5
# - debug4
# - debug3
# - debug2
# - debug1
# - log
# - notice
# - warning
# - error
postgresql_client_min_messages: "notice"

# Values in order of decreasing detail:
# - debug5
# - debug4
# - debug3
# - debug2
# - debug1
# - info
# - notice
# - warning
# - error
# - log
# - fatal
# - panic
postgresql_log_min_messages: "warning"

# Values in order of decreasing detail:
# - debug5
# - debug4
# - debug3
# - debug2
# - debug1
# - info
# - notice
# - warning
# - error
# - log
# - fatal
# - panic (effectively off)
postgresql_log_min_error_statement: "error"

# -1 is disabled, 0 logs all statements and their durations, > 0 logs only
# statements running at least this number of milliseconds
postgresql_log_min_duration_statement: -1


# - What to Log -

postgresql_debug_print_parse:     off
postgresql_debug_print_rewritten: off
postgresql_debug_print_plan:      off
postgresql_debug_pretty_print:    on
postgresql_log_checkpoints:       off
postgresql_log_connections:       off
postgresql_log_disconnections:    off
postgresql_log_duration:          off
postgresql_log_error_verbosity:   "default"  # terse, default, or verbose messages
postgresql_log_hostname:          off

# Special values:
#   %a = application name
#   %u = user name
#   %d = database name
#   %r = remote host and port
#   %h = remote host
#   %p = process ID
#   %t = timestamp without milliseconds
#   %m = timestamp with milliseconds
#   %n = timestamp with milliseconds (as a Unix epoch)
#   %i = command tag
#   %e = SQL state
#   %c = session ID
#   %l = session line number
#   %s = sessioan start timestamp
#   %v = virtual transaction ID
#   %x = transaction ID (0 if none)
#   %q = stop here in non-session
#        processes
#   %% = '%'
postgresql_log_line_prefix: "%t "

# log lock waits >= deadlock_timeout
postgresql_log_lock_waits: off
postgresql_log_statement:  "none"  # none, ddl, mod, all
postgresql_log_replication_commands: off
# log temporary files equal or larger
postgresql_log_temp_files: -1
postgresql_log_timezone:   "UTC"



#------------------------------------------------------------------------------
# RUNTIME STATISTICS
#------------------------------------------------------------------------------

# - Query/Index Statistics Collector -

postgresql_track_activities:          on
postgresql_track_counts:              on
postgresql_track_io_timing:           off   # (>= 9.2)
postgresql_track_functions:           "none" # none, pl, all
postgresql_track_activity_query_size: 1024
postgresql_update_process_title:      on
postgresql_stats_temp_directory:      "pg_stat_tmp"


# - Statistics Monitoring -

postgresql_log_parser_stats:    off
postgresql_log_planner_stats:   off
postgresql_log_executor_stats:  off
postgresql_log_statement_stats: off


#------------------------------------------------------------------------------
# AUTOVACUUM PARAMETERS
#------------------------------------------------------------------------------

# Enable autovacuum subprocess? 'on' requires track_counts to also be on.
postgresql_autovacuum: on
# -1 disables, 0 logs all actions and their durations, > 0 logs only
# actions running at least this number of milliseconds.
postgresql_log_autovacuum_min_duration: -1
# max number of autovacuum subprocesses
postgresql_autovacuum_max_workers: 3
# time between autovacuum runs
postgresql_autovacuum_naptime: 1min
# min number of row updates before vacuum
postgresql_autovacuum_vacuum_threshold: 50
# min number of row updates before analyze
postgresql_autovacuum_analyze_threshold: 50
# fraction of table size before vacuum
postgresql_autovacuum_vacuum_scale_factor: 0.2
# fraction of table size before analyze
postgresql_autovacuum_analyze_scale_factor: 0.1
# maximum XID age before forced vacuum
postgresql_autovacuum_freeze_max_age: 200000000
# maximum Multixact age before forced vacuum (>= 9.3)
postgresql_autovacuum_multixact_freeze_max_age: 400000000
# default vacuum cost delay for autovacuum, in milliseconds
postgresql_autovacuum_vacuum_cost_delay: 20ms
# default vacuum cost limit for autovacuum,
postgresql_autovacuum_vacuum_cost_limit: -1


#------------------------------------------------------------------------------
# CLIENT CONNECTION DEFAULTS
#------------------------------------------------------------------------------

# - Statement Behavior -

postgresql_search_path: # schema names
  - '"$user"'
  - "public"
postgresql_default_tablespace: "" # a tablespace name, "" uses the default
postgresql_temp_tablespaces: [] # a list of tablespace names

postgresql_check_function_bodies:          on
postgresql_default_transaction_isolation:  "read committed"
postgresql_default_transaction_read_only:  off
postgresql_default_transaction_deferrable: off
postgresql_session_replication_role:       "origin"

postgresql_statement_timeout:                     0           # in milliseconds, 0 is disabled
postgresql_lock_timeout:                          0           # in milliseconds, 0 is disabled (>= 9.3)
postgresql_idle_in_transaction_session_timeout:   0           # in milliseconds, 0 is disabled (>= 9.6)
postgresql_vacuum_freeze_min_age:                 50000000
postgresql_vacuum_freeze_table_age:               150000000
postgresql_vacuum_cleanup_index_scale_factor:     0.1         # (>= 11)
postgresql_vacuum_multixact_freeze_min_age:       5000000     # (>= 9.3)
postgresql_vacuum_multixact_freeze_table_age:     150000000   # (>= 9.3)

postgresql_bytea_output: "hex"  # hex, escape
postgresql_xmlbinary:    "base64"
postgresql_xmloption:    "content"
postgresql_gin_fuzzy_search_limit:  0   # (<= 9.2)
postgresql_gin_pending_list_limit: 4MB  # (>= 9.5)


# - Locale and Formatting -

postgresql_datestyle:
  - "iso"
  - "mdy"
postgresql_intervalstyle:      "postgres"
postgresql_timezone:           "UTC"

# Select the set of available time zone abbreviations. Currently, there are:
#   Default
#   Australia
#   India
# You can create your own file in `share/timezonesets/`.
postgresql_timezone_abbreviations: "Default"

postgresql_extra_float_digits: 0          # min -15, max 3
postgresql_client_encoding:    false  # actually defaults to database encoding
                                      # 'sql_ascii', 'UTF8', ...

# These settings are initialized by initdb, but they can be changed.

# locale for system error message
postgresql_lc_messages: "{{ postgresql_locale }}"
# locale for monetary formatting
postgresql_lc_monetary: "{{ postgresql_locale }}"
# locale for number formatting
postgresql_lc_numeric: "{{ postgresql_locale }}"
# locale for time formatting
postgresql_lc_time: "{{ postgresql_locale }}"

postgresql_default_text_search_config: "pg_catalog.english"

postgresql_dynamic_library_path: "$libdir"
postgresql_local_preload_libraries: []
postgresql_session_preload_libraries: []
postgresql_jit_provider: "llvmjit"


#------------------------------------------------------------------------------
# LOCK MANAGEMENT
#------------------------------------------------------------------------------

postgresql_deadlock_timeout: 1s
postgresql_max_locks_per_transaction: 64         # min 10

# Note:  Each lock table slot uses ~270 bytes of shared memory, and there are
# max_locks_per_transaction * (max_connections + max_prepared_transactions)
# lock table slots.
postgresql_max_pred_locks_per_transaction: 64    # min 10

postgresql_max_pred_locks_per_relation: -2       # (>= 10) negative values mean
               # (max_pred_locks_per_transaction
               #  / -max_pred_locks_per_relation) - 1
postgresql_max_pred_locks_per_page: 2            # (>= 10) min 0


#------------------------------------------------------------------------------
# VERSION/PLATFORM COMPATIBILITY
#------------------------------------------------------------------------------

# - Previous PostgreSQL Versions -

postgresql_array_nulls:                 on
postgresql_backslash_quote:             "safe_encoding" # on, off, or safe_encoding
postgresql_default_with_oids:           off
postgresql_escape_string_warning:       on
postgresql_lo_compat_privileges:        off
postgresql_operator_precedence_warning: off
postgresql_quote_all_identifiers:       off
postgresql_sql_inheritance:             on
postgresql_standard_conforming_strings: on
postgresql_synchronize_seqscans:        on


# - Other Platforms and Clients -

postgresql_transform_null_equals:       off


#------------------------------------------------------------------------------
# ERROR HANDLING
#------------------------------------------------------------------------------

# Terminate session on any error?
postgresql_exit_on_error: off
# Reinitialize after backend crash?
postgresql_restart_after_crash: on
# Retry or panic on failure to fsync data?
postgresql_data_sync_retry: off


#------------------------------------------------------------------------------
# CONFIG FILE INCLUDES
#------------------------------------------------------------------------------

# include files ending in '.conf' from
# directory 'conf.d'
postgresql_include_dir:        "conf.d"
# include file only if it exists
postgresql_include_if_exists:  false
# include file
postgresql_include:            false


#------------------------------------------------------------------------------
# PGTUNE
#------------------------------------------------------------------------------
# Should we run pgtune and accept the changes it proposes?
postgresql_pgtune: no
# Total system memory in bytes, will attempt to detect if set to "no"
postgresql_pgtune_memory: no
# Database type, valid options are DW, OLTP, Web, Mixed, Desktop
postgresql_pgtune_type: "Mixed"
# Maximum number of expected connections, if "no", default based on db type
postgresql_pgtune_connections: no

#------------------------------------------------------------------------------
# INSTALL/REPO
#------------------------------------------------------------------------------

# EPEL
postgresql_epel_release_base_url: "https://dl.fedoraproject.org/pub/epel"
postgresql_epel_release_url: "{{ postgresql_epel_release_base_url }}/epel-release-latest-{{ ansible_distribution_major_version }}.noarch.rpm"

# Install repo, or rely on existing configuration (Satellite, Artifactory, etc.)
postgresql_install_repository: true

# APT settings
postgresql_apt_key_id: "ACCC4CF8"
postgresql_apt_key_url: "https://www.postgresql.org/media/keys/ACCC4CF8.asc"
postgresql_apt_repository: "deb http://apt.postgresql.org/pub/repos/apt/ {{ ansible_distribution_release }}-pgdg main {{ postgresql_version }}"
# Pin-Priority of PGDG repository
postgresql_apt_pin_priority: 500

# YUM repository locations
postgresql_yum_repository_url: "http://yum.postgresql.org"
postgresql_pgdg_repository_url: "https://download.postgresql.org/pub/repos/yum/"

# YUM (RedHat, CentOS, etc.) baseurl/gpgkey
postgresql_yum_repository_baseurl: "{{ postgresql_yum_repository_url }}/{{ postgresql_version }}/{{ ansible_os_family | lower }}/rhel-{{ ansible_distribution_major_version }}-{{ ansible_architecture }}"
postgresql_yum_repository_gpgkey: "{{ postgresql_pgdg_repository_url }}/RPM-GPG-KEY-PGDG-{{ postgresql_version_terse }}"

# DNF (Fedora) baseurl/gpgkey
postgresql_dnf_repository_baseurl: "{{ postgresql_yum_repository_url }}/{{ postgresql_version }}/fedora/fedora-{{ ansible_distribution_major_version }}-{{ ansible_architecture }}"
postgresql_dnf_repository_gpgkey: "{{ postgresql_yum_repository_gpgkey }}"

postgresql_apt_py3_dependencies: ["python3-psycopg2", "locales"]
postgresql_apt_py2_dependencies: ["python-psycopg2", "python-pycurl", "locales"]
postgresql_apt_dependencies: "{{ postgresql_apt_py3_dependencies if 'python3' in ansible_python_interpreter|default('') else postgresql_apt_py2_dependencies }}"