How to Change PostgreSQL Log Format on CentOS 6.2

In this guide, we will cover how to change the PostgreSQL log format on a CentOS 6.2 system.

PostgreSQL allows you to customize the log format to suit your needs and preferences, making it easier to analyze and manage the logs.

We will go through the steps to modify the log format by updating the PostgreSQL configuration file.

The desired outcome is to have a customized PostgreSQL log format that meets your requirements on CentOS 6.2.

Step 1: Locate the PostgreSQL configuration file

First, you need to locate the postgresql.conf file, which contains the configuration settings for the PostgreSQL database. It is usually located in the “data” directory of your PostgreSQL installation. You can use the “find” command to search for the file:

find / -name postgresql.conf 2>/dev/null

Take note of the file’s location for future reference.

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Step 2: Edit the PostgreSQL configuration file

Open the postgresql.conf file with a text editor of your choice, such as “vi” or “nano”. Replace “/path/to/postgresql.conf” with the actual path you found in Step 1:

sudo nano /path/to/postgresql.conf

Step 3: Update the log_line_prefix setting

In the postgresql.conf file, locate the “log_line_prefix” setting. This setting defines the format of the log lines. Uncomment the line by removing the “#” symbol at the beginning of the line, and update the log format according to your preferences. Below is an example of a custom log format:

log_line_prefix = '[%t] [%p] [%l] %u@%d '

In this example, the log format includes a timestamp (%t), process ID (%p), log line number (%l), user (%u), and database name (%d).

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Step 4: Save the changes and exit the editor

Save the changes made to the postgresql.conf file and exit the text editor. If you are using “nano,” press “Ctrl + X,” followed by “Y” and “Enter” to save and exit. If you are using “vi,” press “Esc,” followed by “:wq” and “Enter.”

Step 5: Restart the PostgreSQL service

Restart the PostgreSQL service to apply the changes made to the log format:

sudo service postgresql restart
Stopping postgresql service:                               [  OK  ]
Starting postgresql service:                               [  OK  ]

The new log format should now be in effect.

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Commands and Their Functions:

  1. find – Searches for files and directories in a directory hierarchy based on different criteria.
  2. nano – A simple, user-friendly text editor for Unix-based systems.
  3. vi – A powerful, modal text editor available on Unix-based systems.
  4. sudo service postgresql restart – Restarts the PostgreSQL service to apply changes and configurations.

The Outcome

By following the steps outlined in this guide, you have successfully changed the PostgreSQL log format on your CentOS 6.2 system.

The customized log format should make it easier for you to analyze and manage your PostgreSQL logs, tailored to your specific needs and preferences.

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