How to fix Invalid value for parameter in PostgreSQL

PostgreSQLINTERMEDIATEMEDIUMUpdated Dec 28, 2025· 262 views

PostgreSQL rejects configuration parameters with unrecognized or unsupported values during startup or connection. This typically affects locale, timezone, or text search settings.

Quick fix

Fixes Invalid value for parameter

# Check server log (Docker)
docker logs <container_name>

# Check server log (standard)
tail -f /var/log/postgresql/postgresql.log
  1. Check PostgreSQL error log for the specific invalid parameter
  2. Validate locale settings if locale parameters are invalid
  3. Fix locale parameters in postgresql.conf
  4. Validate timezone if TimeZone parameter is invalid
postgresql — error
# Check server log (Docker)
docker logs <container_name>
# Check server log (standard)
tail -f /var/log/postgresql/postgresql.log
Invalid value for parameter

What this error means

PostgreSQL validates all configuration parameters against allowed values when loading settings from postgresql.conf or connection startup packets. When a parameter receives a value PostgreSQL cannot recognize or support in your environment, the server raises this fatal error and refuses to start or complete the connection. Common affected parameters include locale settings (lc_messages, lc_monetary), timezones, and text search configurations. The error prevents database access until the invalid parameter is corrected.

Typical symptoms

  • PostgreSQL server fails to start with FATAL error in logs
  • Cannot connect to database; connection rejected at startup
  • Error appears immediately after upgrading PostgreSQL or changing system locales
  • Multiple locale-related parameter errors appear (lc_messages, lc_monetary, lc_time all invalid)
  • Docker container exits on start with parameter validation errors

Common causes

  1. System missing required locale (e.g., en_US.UTF-8 not installed or available)
  2. Timezone abbreviation or name not recognized by PostgreSQL timezone database (e.g., PST instead of America/Los_Angeles)
  3. Text search configuration reference points to non-existent schema or configuration
  4. PostgreSQL upgraded but postgresql.conf still references old or unsupported parameter values
  5. Docker image or container environment lacks locale data; parent OS lacks required locale support
  6. Typo or formatting error in parameter value (extra spaces, wrong case for enum values)

How to fix "Invalid value for parameter"

1Check PostgreSQL error log for the specific invalid parameter

Review the PostgreSQL error message carefully to identify which parameter is invalid.

bash
# Check server log (Docker)
docker logs <container_name>

# Check server log (standard)
tail -f /var/log/postgresql/postgresql.log

Note the parameter name (e.g., lc_messages, TimeZone) and the rejected value.

2Validate locale settings if locale parameters are invalid

If the error involves lc_messages, lc_monetary, lc_numeric, or lc_time:

bash
# List all available locales on your system
locale -a

# Check if en_US.UTF-8 is available (common fix)
locale -a | grep en_US

# On Ubuntu/Debian, install missing locales
sudo locale-gen en_US.UTF-8
sudo update-locale

If the required locale is not available, either install it on your system or change the parameter value to "C" (always available).

3Fix locale parameters in postgresql.conf

Edit postgresql.conf and use only valid locale values:

bash
# Find postgresql.conf
sudo find / -name postgresql.conf

# Edit the file
sudo nano /path/to/postgresql.conf

Replace invalid locale values with valid ones:

conf
# WRONG: non-existent locale
lc_messages = en_US.utf8

# RIGHT: use C (always available) or installed locale
lc_messages = C
# OR
lc_messages = en_US.UTF-8  # if installed

# Apply to all locale parameters
lc_monetary = C
lc_numeric = C
lc_time = C

Save and restart PostgreSQL.

4Validate timezone if TimeZone parameter is invalid

For timezone errors, use only IANA timezone names (not abbreviations):

bash
# WRONG: abbreviation not valid
TimeZone = PST      # Fails
TimeZone = CDT      # Fails

# RIGHT: use IANA timezone database
TimeZone = America/Los_Angeles
TimeZone = America/Chicago
TimeZone = UTC

Valid timezone values are located in your PostgreSQL timezone database:

bash
# View all valid timezones
psql -d postgres -c "SELECT * FROM pg_timezone_names ORDER BY name;"

Use one of these exact values in postgresql.conf or connection strings.

5Check text search configuration if referenced

If the error mentions default_text_search_config:

bash
psql -d postgres -c "SELECT * FROM pg_ts_config;"

Ensure the configured value exists. If referencing a schema, verify both schema and configuration exist:

conf
# WRONG: references non-existent schema.config
default_text_search_config = public.pg_config

# RIGHT: use built-in or verify custom config exists
default_text_search_config = english
default_text_search_config = simple

Built-in configurations like "english" and "simple" are always available.

6Restart PostgreSQL after fixing parameters

After editing postgresql.conf, restart the PostgreSQL service:

bash
# Docker
docker restart <container_name>

# Standard Linux service
sudo systemctl restart postgresql

# Or via sudo
sudo pg_ctlcluster 14 main restart

Verify the service started successfully:

bash
sudo systemctl status postgresql

Check logs for any remaining parameter errors.

Advanced notes

For Docker/container deployments, ensure the base image includes required locales. Alpine-based PostgreSQL images often lack locale data; use debian-based images or manually install locale packages. For upgraded systems, compare old and new postgresql.conf.sample to see if removed or changed parameters are causing issues. Parameter values are case-sensitive for most types (especially enum parameters like log_statement); check PostgreSQL documentation for specific parameter capitalization rules. Use pg_settings view to inspect runtime parameter values and their allowed ranges: SELECT name, setting, min_val, max_val, enumvals FROM pg_settings WHERE name = 'parameter_name';

Frequently asked questions

What does "Invalid value for parameter" mean?
conf or connection startup packets. When a parameter receives a value PostgreSQL cannot recognize or support in your environment, the server raises this fatal error and refuses to start or complete the connection. Common affected parameters include locale settings (lc_messages, lc_monetary), timezones, and text search configurations.
How do I fix "Invalid value for parameter"?
PostgreSQL rejects configuration parameters with unrecognized or unsupported values during startup or connection. This typically affects locale, timezone, or text search settings.
What causes "Invalid value for parameter"?
System missing required locale (e.g., en_US.UTF-8 not installed or available) Timezone abbreviation or name not recognized by PostgreSQL timezone database (e.g., PST instead of America/Los_Angeles) Text search configuration reference points to non-existent schema or configuration
Is the "Invalid value for parameter" error serious?
It is a medium-severity error — more of a blocker than a risk. The steps above resolve it.

Official resources & further reading