nginx 日志处理

#!/bin/bash

nginx_log_dir="/var/log/nginx"
nginx_pid_file="nginx.pid"
nginx_log_file="access.log"

date_time=$(date +%Y-%m-%d_%H-%M-%S)  # 避免同一秒内多次运行导致文件名冲突

# 检查文件是否存在
file_exists() {
  local file="$1"
  if [ ! -f "$file" ]; then
    echo "File $file does not exist."
    return 1
  fi
  return 0
}

split_and_rm_log_file() {
  local log_file="$1"
  if file_exists "$log_file"; then
    split -l 50000 "$log_file" "${log_file}_part"
    rm "$log_file"
  fi
}

rotate_log_file() {
  local log_file="$1"
  if file_exists "$log_file"; then
    mv "$log_file" "${log_file}-${date_time}"
  fi
}

restart_nginx() {
  if file_exists "$nginx_pid_file"; then
    local nginx_pid=$(cat "$nginx_pid_file")
    if kill -0 "$nginx_pid" &> /dev/null; then
      kill -USR1 "$nginx_pid"
    else
      echo "Nginx process with PID $nginx_pid does not exist."
    fi
  else
    echo "Nginx PID file $nginx_pid_file does not exist."
  fi
}

nginx_log_split() {
  local log_file="$nginx_log_dir/$nginx_log_file"
  if file_exists "$log_file"; then
    local log_size=$(du -m "$log_file" | cut -f1)
    if [ "$log_size" -gt 500 ]; then
      echo "Log file size is greater than 500MB. Splitting the log file."
      rotate_log_file "$log_file"
      restart_nginx
      split_and_rm_log_file "${log_file}-${date_time}"
    elif [ "$log_size" -eq 0 ]; then
      echo "Log file size is 0MB. No action needed."
    fi
  else
    echo "Log file $log_file does not exist."
  fi
}

nginx_log_split