Linux服务器每24小时生成带日期命名的AIS日志文件方案咨询

Alright, let's figure out how to get your AIS log files rotating every 24 hours with date-time based filenames. I've got a couple of solid approaches for you, depending on your preference for simplicity or system-level integration:

方案1：用Shell脚本循环控制（简单易上手） #

This approach avoids relying on extra system tools and gives you direct control over the rotation logic.

1. Create a shell script (e.g., rotate_ais_log.sh) with the following content:

#!/bin/bash
# Replace with your actual port number
PORT=your_port_number_here

while true; do
    # Generate a filename with current date and time (customize the format as needed)
    LOG_FILE="ais_log_$(date +%Y%m%d_%H%M%S).txt"
    echo "Starting new log session: $LOG_FILE"
    
    # Run your AIS pipeline, auto-terminate after 24 hours
    timeout 24h nc -ul -p "$PORT" | gpsdecode -j | tee "$LOG_FILE"
    
    # Add a small delay to avoid immediate restarts if nc exits unexpectedly
    sleep 10
done

2. Make the script executable:

chmod +x rotate_ais_log.sh

3. Run it in the background (use nohup or screen to keep it running after you log out):

nohup ./rotate_ais_log.sh > /dev/null 2>&1 &

方案2：用logrotate（系统级日志管理，更稳定） #

If you prefer using Linux's built-in log management tool, logrotate is a great choice—it's designed for exactly this kind of task.

1. First, run your AIS pipeline to write to a fixed filename (we'll let logrotate handle the rotation):

nohup nc -ul -p your_port_number_here | gpsdecode -j > /path/to/ais_current.log 2>&1 &

2. Create a logrotate configuration file at /etc/logrotate.d/ais_log:

/path/to/ais_current.log {
    daily          # Rotate logs every day
    rotate 30      # Keep the last 30 days of logs
    dateext        # Append a date suffix to rotated logs
    dateformat _%Y%m%d_%H%M%S  # Customize the date-time format
    missingok      # Don't error if the log file is missing
    notifempty     # Skip rotation if the log file is empty
    copytruncate   # Copy the current log content then truncate the original (no need to restart your pipeline)
    create 0644 root root  # Create a new empty log file with correct permissions
}

3. Logrotate runs daily via cron by default, so you don't need to do anything else. To test it manually:

logrotate -f /etc/logrotate.d/ais_log

方案3：结合Systemd服务（开机自启，高可靠性） #

If you want your AIS logger to automatically start on system boot and restart if it crashes, wrap the shell script from 方案1 in a Systemd service.

1. Create a Systemd service file at /etc/systemd/system/ais-logger.service:

[Unit]
Description=AIS Data Logger with Daily Log Rotation
After=network.target

[Service]
User=your_username  # Replace with your actual username
ExecStart=/path/to/rotate_ais_log.sh
Restart=always      # Restart the service if it exits unexpectedly
RestartSec=10       # Wait 10 seconds before restarting

[Install]
WantedBy=multi-user.target

2. Enable and start the service:

sudo systemctl daemon-reload
sudo systemctl enable --now ais-logger.service

3. Check the service status anytime with:

sudo systemctl status ais-logger.service

额外注意事项 #

• Customize the date format in date +%Y%m%d_%H%M%S to fit your needs—for example, %Y-%m-%d_%H-%M-%S adds hyphens for readability.
• When using copytruncate with logrotate, ensure your nc and gpsdecode processes handle file truncation gracefully (most streaming tools do without issues).
• The timeout command used in the shell script is part of the coreutils package, which is pre-installed on almost all Linux distributions.

内容的提问来源于stack exchange，提问作者Lanas