matrix-docker-ansible-deploy/roles/custom/matrix-postgres/defaults/main.yml

---
# Project source code URL: https://github.com/postgres/postgres

# Controls if the Postgres server managed by the playbook is enabled.
# You can turn it off and use an external Postgres server by setting this to `false`.
# Doing this has various downsides. See `docs/configuring-playbook-external-postgres.md` to learn more.
matrix_postgres_enabled: true

matrix_postgres_connection_hostname: "matrix-postgres"
matrix_postgres_connection_port: 5432
matrix_postgres_connection_username: "matrix"
matrix_postgres_connection_password: ""
matrix_postgres_db_name: "matrix"

matrix_postgres_base_path: "{{ matrix_base_data_path }}/postgres"
matrix_postgres_data_path: "{{ matrix_postgres_base_path }}/data"

# matrix_postgres_systemd_services_to_stop_for_maintenance_list specifies the list of systemd services to stop before vacuuming or upgrading.
# These services will be restarted after the operation completes.
matrix_postgres_systemd_services_to_stop_for_maintenance_list: []

matrix_postgres_architecture: amd64

# matrix_postgres_docker_image_suffix controls whether we use Alpine-based images (`-alpine`) or the normal Debian-based images.
# Alpine-based Postgres images are smaller and we usually prefer them, but they don't work on ARM32 (tested on a Raspberry Pi 3 running Raspbian 10.7).
# On ARM32, `-alpine` images fail with the following error:
# > LOG:  startup process (PID 37) was terminated by signal 11: Segmentation fault
matrix_postgres_docker_image_suffix: "{{ '-alpine' if matrix_postgres_architecture in ['amd64', 'arm64'] else '' }}"

matrix_postgres_docker_image_v9: "{{ matrix_container_global_registry_prefix }}postgres:9.6.24{{ matrix_postgres_docker_image_suffix }}"
matrix_postgres_docker_image_v10: "{{ matrix_container_global_registry_prefix }}postgres:10.22{{ matrix_postgres_docker_image_suffix }}"
matrix_postgres_docker_image_v11: "{{ matrix_container_global_registry_prefix }}postgres:11.17{{ matrix_postgres_docker_image_suffix }}"
matrix_postgres_docker_image_v12: "{{ matrix_container_global_registry_prefix }}postgres:12.12{{ matrix_postgres_docker_image_suffix }}"
matrix_postgres_docker_image_v13: "{{ matrix_container_global_registry_prefix }}postgres:13.8{{ matrix_postgres_docker_image_suffix }}"
matrix_postgres_docker_image_v14: "{{ matrix_container_global_registry_prefix }}postgres:14.5{{ matrix_postgres_docker_image_suffix }}"
matrix_postgres_docker_image_v15: "{{ matrix_container_global_registry_prefix }}postgres:15.0{{ matrix_postgres_docker_image_suffix }}"
matrix_postgres_docker_image_latest: "{{ matrix_postgres_docker_image_v15 }}"

# This variable is assigned at runtime. Overriding its value has no effect.
matrix_postgres_docker_image_to_use: '{{ matrix_postgres_docker_image_latest }}'

matrix_postgres_docker_image_force_pull: "{{ matrix_postgres_docker_image_to_use.endswith(':latest') }}"

# A list of extra arguments to pass to the container
matrix_postgres_container_extra_arguments: []

# A list of extra arguments to pass to the postgres process
# e.g. "-c 'max_connections=200'"
matrix_postgres_process_extra_arguments: []

# Controls whether the matrix-postgres container exposes a port (tcp/5432 in the
# container) that can be used to access the database from outside the container (e.g. with psql)
#
# psql postgresql://username:password@localhost:<port>/database_name
#
# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:5432"), or empty string to not expose.
matrix_postgres_container_postgres_bind_port: ""

# A list of additional (databases and their credentials) to create.
#
# Example:
# matrix_postgres_additional_databases:
#   - name: matrix_appservice_discord
#     username: matrix_appservice_discord
#     password: some_password
#   - name: matrix_appservice_slack
#     username: matrix_appservice_slack
#     password: some_password
matrix_postgres_additional_databases: []

# A list of roles/users to avoid creating when importing (or upgrading) the database.
# If a dump file contains the roles and they've also been created beforehand (see `matrix_postgres_additional_databases`),
# importing would fail.
# We either need to not create them or to ignore the `CREATE ROLE` statements in the dump.
matrix_postgres_import_roles_to_ignore: |
  {{
    (
      [matrix_postgres_connection_username]
      +
      matrix_postgres_additional_databases|map(attribute='username') | list
    ) | unique
  }}  

# When importing an existing Postgres database (when restoring a backup) or when doing a Postgres upgrade (which dumps & restores), we'd like to avoid:
# - creating users (`CREATE ROLE ..`)
# - updating passwords for users (`ALTER ROLE matrix WITH SUPERUSER INHERIT NOCREATEROLE NOCREATEDB LOGIN NOREPLICATION NOBYPASSRLS PASSWORD 'md5...`)
#
# Both of these operations are done by the playbook anyway.
# Updating passwords is especially undesirable, because older versions hash passwords using md5 and export them as md5 hashes in the dump file,
# which is unsupported by default by newer Postgres versions (v14+).
# When users are created and passwords are set by the playbook, they end up hashed as `scram-sha-256` on Postgres v14+.
# If an md5-hashed password is restored on top, Postgres v14+ will refuse to authenticate users with it by default.
#
# We also allow for the role name to be quoted, which is rare, but might happen for role names which are special keywords (e.g. `default`).
matrix_postgres_import_roles_ignore_regex: "^(CREATE|ALTER) ROLE \\\"?({{ matrix_postgres_import_roles_to_ignore | join('|') }})\\\"?(;| WITH)"  # noqa jinja[spacing]

# A list of databases to avoid creating when importing (or upgrading) the database.
# If a dump file contains the databases and they've also been created beforehand (see `matrix_postgres_additional_databases`),
# importing would fail.
# We either need to not create them or to ignore the `CREATE DATABASE` statements in the dump.
matrix_postgres_import_databases_to_ignore: |
  {{
    (
      [matrix_postgres_db_name]
      +
      matrix_postgres_additional_databases|map(attribute='name') | list
    ) | unique
  }}  

# We also allow for the database name to be quoted, which is rare, but might happen for database names which are special keywords (e.g. `default`).
matrix_postgres_import_databases_ignore_regex: "^CREATE DATABASE \\\"?({{ matrix_postgres_import_databases_to_ignore | join('|') }})\\\"?\\s"  # noqa jinja[spacing]

# The number of seconds to wait after starting `matrix-postgres.service`
# and before trying to run queries for creating additional databases/users against it.
#
# For most (subsequent) runs, Postgres would already be running, so no waiting will be happening at all.
#
# On ARM, we wait some more. ARM32 devices are especially known for being slow.
# ARM64 likely don't need such a long delay, but it doesn't hurt too much having it.
matrix_postgres_additional_databases_postgres_start_wait_timeout_seconds: "{{ 45 if matrix_postgres_architecture in ['arm32', 'arm64'] else 15 }}"


matrix_postgres_pgloader_container_image_self_build: false
matrix_postgres_pgloader_container_image_self_build_repo: "https://github.com/illagrenan/pgloader-docker.git"
matrix_postgres_pgloader_container_image_self_build_repo_branch: "v{{ matrix_postgres_pgloader_docker_image_tag }}"
matrix_postgres_pgloader_container_image_self_build_src_path: "{{ matrix_postgres_base_path }}/pgloader-container-src"

# We use illagrenan/pgloader, instead of the more official dimitri/pgloader image,
# because the official one only provides a `latest` tag.
matrix_postgres_pgloader_docker_image: "{{ matrix_postgres_pgloader_docker_image_name_prefix }}illagrenan/pgloader:{{ matrix_postgres_pgloader_docker_image_tag }}"
matrix_postgres_pgloader_docker_image_name_prefix: "{{ 'localhost/' if matrix_postgres_pgloader_container_image_self_build else matrix_container_global_registry_prefix }}"
matrix_postgres_pgloader_docker_image_tag: "3.6.2"
matrix_postgres_pgloader_docker_image_force_pull: "{{ matrix_postgres_pgloader_docker_image.endswith(':latest') }}"