Debian Node.js log backup and recovery strategy

In order to ensure the log security of Node.js applications in Debian systems, this article provides a complete set of log backup and recovery policies to ensure rapid recovery in case of system failure or data loss.

1. Log backup

1.1 Regular backup: use rsync

rsync is a powerful file synchronization tool that enables regular backup of log files:

 # Create backup directory mkdir -p /backup/logs

# Use rsync to backup logs rsync -av --delete /var/log/nodejs /backup/logs/

1.2 Timed tasks: crontab

Create a backup script and execute it regularly using crontab:

 # Create backup script echo '#!/bin/bash' > /usr/local/bin/backup_nodejs_logs.sh
echo 'rsync -av --delete /var/log/nodejs /backup/logs/' >> /usr/local/bin/backup_nodejs_logs.sh
echo 'date >> /backup/logs/backup.log' >> /usr/local/bin/backup_nodejs_logs.sh
chmod x /usr/local/bin/backup_nodejs_logs.sh

# Edit crontab
crontab -e

# Perform backup at 2 am every day 0 2 * * * /usr/local/bin/backup_nodejs_logs.sh

2. Log recovery

2.1 Recover log files

Use rsync to copy the backup log back to its original location:

 # Recover log file rsync -av /backup/logs/nodejs /var/log/nodejs

2.2 Verify recovery results

Check the integrity and availability of recovery logs:

 # View the restored log tail -f /var/log/nodejs/app.log

3. Monitoring and Alarm

3.1 Monitoring Tools

Use monitoring tools such as Prometheus and Grafana to monitor log file sizes and changes and set alarms.

3.2 Alarm settings

Configure alarm rules in Prometheus and set alert notifications in Grafana, for example:

 # Prometheus Alarm Rule Sample Groups:
- name: nodejs_logs
  Rules:
  - alert: LargeLogFileSize
    expr: size(nodejs_log_file) > 100MB
    for: 1h
    labels:
      severity: warning
    annotations:
      summary: "Log file is too large"
      Description: "Log file {{ $labels.instance }} has a size of more than 100MB."

4. Automatic testing

4.1 Automated test scripts

Write automated test scripts to verify the backup and recovery process:

 #!/bin/bash

# Create a temporary directory mkdir -p /tmp/backup_logs

# Perform backup rsync -av --delete /var/log/nodejs /tmp/backup_logs/

# Verify the backup file if [ -d "/tmp/backup_logs/nodejs" ]; then
  echo "Backup successful"
else
  echo "Backup failed"
fi

# Clean up the temporary directory rm -rf /tmp/backup_logs

4.2 Run tests regularly

Add test scripts to crontab and run them regularly to ensure the reliability of the backup and recovery process:

 # Edit crontab
crontab -e

# Run the test script every Monday at 3pm 0 15 * * 1 /path/to/backup_test_script.sh

Through the above strategies, you can effectively manage log backup and recovery of Node.js applications on Debian systems, improving system reliability and maintainability.

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