How to clean nginx error log

The error log is located in /var/log/nginx (Linux) or /usr/local/var/log/nginx (macOS). Use the command line to clean up the steps: 1. Back up the original log; 2. Create an empty file as a new log; 3. Restart the Nginx service. Automatic cleaning can also be used with third-party tools such as logrotate or configured.

How to clean up Nginx error logs

1. Find the error log file

Error logs are usually located in the following path:

• /var/log/nginx (Linux)
• /usr/local/var/log/nginx (macOS)

2. Check the file size

Check the current size of the error log file to determine if cleaning is required:

 <code>ls -lh /var/log/nginx/error.log</code>

3. Clean up using the command line

Execute the command to clean up the error log in the following order:

1. Back up the original log file:

    <code>mv /var/log/nginx/error.log /var/log/nginx/error.log.bak</code>

2. Create an empty file as a new error log:

    <code>touch /var/log/nginx/error.log</code>

3. Restart the Nginx service:

    <code>nginx -s reload</code>

4. Use third-party tools

In addition to using the command line, you can also use third-party tools to clean up Nginx error logs, such as:

• logrotate: This is a log management tool that automatically cleans and rotates log files.
• fail2ban: This is an intrusion detection and prevention system that analyzes suspicious activity based on error logs and blocks attacks.

5. Automatic cleaning

For high-traffic sites that frequently generate error logs, Nginx can be configured to automatically clean old error logs:

1. Open the /etc/logrotate.d/nginx configuration file.
2. Add the following line:

 <code>/var/log/nginx/*.log { rotate 10 daily compress delaycompress missingok notifempty }</code>

This configuration will keep error logs for the past 10 days and will automatically compress and delete old logs every day.

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