config file error
Production Risk
High: configuration errors can prevent Postgres from starting or accepting connections after a reload.
SQLSTATE F0000 is the generic configuration file error code raised when Postgres cannot parse or apply postgresql.conf, pg_hba.conf, or pg_ident.conf. The server may fail to start or a pg_reload_conf() may fail.
- 1Syntax error in postgresql.conf (e.g., missing quotes, invalid value for a GUC parameter)
- 2Syntax error in pg_hba.conf (e.g., wrong number of fields, invalid authentication method)
- 3Syntax error in pg_ident.conf
- 4Unknown or misspelled GUC parameter name in postgresql.conf
pg_hba.conf syntax error preventing reload.
SELECT pg_reload_conf(); -- fails if config file has errors
expected output
FATAL: could not open file "/etc/postgresql/pg_hba.conf": No such file or directory
Fix 1
Validate configuration files before reloading
WHEN Before running pg_reload_conf() or restarting Postgres.
-- Postgres 10+ can check the config file: SELECT * FROM pg_file_settings WHERE error IS NOT NULL; -- For pg_hba.conf: SELECT * FROM pg_hba_file_rules WHERE error IS NOT NULL;
Why this works
pg_file_settings and pg_hba_file_rules show any configuration errors without requiring a reload.
Fix 2
Fix the syntax error in the configuration file
WHEN When the error identifies a specific line.
Why this works
Edit the configuration file to fix the syntax error identified in the error message. Common issues: missing = sign, invalid boolean value, unrecognised parameter name.
✕ Reload or restart Postgres without validating configuration changes
A config file error can prevent the server from starting after a restart.
pg_file_settings and pg_hba_file_rules views added in Postgres 10 for pre-reload validation.
Class F0 — Configuration File Error
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