log_fdw
foreign-data wrapper for Postgres log file access
Repository
aws/postgresql-logfdw
https://github.com/aws/postgresql-logfdw
Source
log_fdw-1.4.tar.gz
log_fdw-1.4.tar.gz
Overview
| Package | Version | Category | License | Language |
|---|---|---|---|---|
log_fdw | 1.4 | FDW | Apache-2.0 | C |
| ID | Extension | Bin | Lib | Load | Create | Trust | Reloc | Schema |
|---|---|---|---|---|---|---|---|---|
| 8810 | log_fdw | No | Yes | No | Yes | No | No | - |
| Related | pg_sqlog pgaudit file_fdw auto_explain pgauditlogtofile logerrors wrappers multicorn |
|---|
PG18 fixed by vonng
Version
| Type | Repo | Version | PG Ver | Package | Deps |
|---|---|---|---|---|---|
| EXT | PIGSTY | 1.4 | 1817161514 | log_fdw | - |
| RPM | PIGSTY | 1.4 | 1817161514 | log_fdw_$v | - |
| DEB | PIGSTY | 1.4 | 1817161514 | postgresql-$v-log-fdw | - |
Build
You can build the DEB packages for log_fdw using pig build:
pig build pkg log_fdw # build DEB packages
Install
You can install log_fdw directly. First, make sure the PGDG and PIGSTY repositories are added and enabled:
pig repo add pgsql -u # Add repo and update cache
Install the extension using pig or apt/yum/dnf:
pig install log_fdw; # Install for current active PG version
pig ext install -y log_fdw -v 18 # PG 18
pig ext install -y log_fdw -v 17 # PG 17
pig ext install -y log_fdw -v 16 # PG 16
pig ext install -y log_fdw -v 15 # PG 15
pig ext install -y log_fdw -v 14 # PG 14
dnf install -y log_fdw_18 # PG 18
dnf install -y log_fdw_17 # PG 17
dnf install -y log_fdw_16 # PG 16
dnf install -y log_fdw_15 # PG 15
dnf install -y log_fdw_14 # PG 14
apt install -y postgresql-18-log-fdw # PG 18
apt install -y postgresql-17-log-fdw # PG 17
apt install -y postgresql-16-log-fdw # PG 16
apt install -y postgresql-15-log-fdw # PG 15
apt install -y postgresql-14-log-fdw # PG 14
Create Extension:
CREATE EXTENSION log_fdw;
Usage
Create Server
CREATE EXTENSION log_fdw;
CREATE SERVER log_fdw_server FOREIGN DATA WRAPPER log_fdw;
List Available Log Files
SELECT * FROM list_postgres_log_files();
Returns the file name and size of each log file in the PostgreSQL log directory.
Create Foreign Table for CSV Logs
SELECT * FROM create_foreign_table_for_log_file(
'postgresql_2024_01_15_csv', -- foreign table name
'log_fdw_server', -- server name
'postgresql-2024-01-15.csv' -- log file name
);
Create Foreign Table for Plain Text Logs
SELECT * FROM create_foreign_table_for_log_file(
'postgresql_2024_01_15_log',
'log_fdw_server',
'postgresql-2024-01-15.log'
);
Query Log Data
-- Query CSV-format logs (structured columns)
SELECT log_time, error_severity, message
FROM postgresql_2024_01_15_csv
WHERE error_severity = 'ERROR'
ORDER BY log_time DESC
LIMIT 20;
-- Query plain text logs
SELECT * FROM postgresql_2024_01_15_log LIMIT 10;
Granting Access to Non-Superusers
Only superusers can create the extension, but access can be granted:
GRANT pg_monitor TO monitoring_user;
GRANT CREATE ON SCHEMA public TO monitoring_user;
GRANT USAGE ON FOREIGN SERVER log_fdw_server TO monitoring_user;
Functions Reference
| Function | Description |
|---|---|
list_postgres_log_files() | List available log files and their sizes |
create_foreign_table_for_log_file(table_name, server_name, file_name) | Create a foreign table from a log file |
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