linux 死循环清理日志

# 查找高CPU占用进程
top

# 使用strace跟踪进程
strace -p <PID>

# 使用gdb调试进程
gdb -p <PID>

# 安装logrotate（如果未安装）
sudo apt-get install logrotate

# 配置logrotate规则
sudo nano /etc/logrotate.d/myapp

# 示例配置：
/var/log/myapp.log {
    daily
    missingok
    rotate 7
    compress
    delaycompress
    notifempty
    create 0640 root root
}

# 查看磁盘空间使用情况
df -h

# 删除或清空日志文件
sudo rm /var/log/myapp.log
# 或者
sudo echo "" > /var/log/myapp.log

# 示例监控脚本
#!/bin/bash
THRESHOLD=80
df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
do
    usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1)
    partition=$(echo $output | awk '{ print $2 }')
    if [ $usep -ge $THRESHOLD ]; then
        echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" | mail -s "Alert: Almost out of disk space $usep%" your_email@example.com
    fi
done