Nginx日志分割

```bash

#!/bin/bash

# 常量定义

nginx_log_dir="/var/log/nginx"

nginx_pid_file="/var/run/nginx.pid"

nginx_log_file="$nginx_log_dir/access.log"

MAX_LOG_SIZE_MB=500

SPLIT_LINES=50000

# 时间戳

date_time=$(date +%Y-%m-%d_%H-%M-%S)

# 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

}

# 日志文件分割和删除

split_and_rm_log_file() {

local log_file="$1"

if file_exists "$log_file"; then

if ! split -l $SPLIT_LINES "$log_file" "${log_file}_part"; then

echo "Failed to split log file."

exit 1

fi

rm "$log_file"

fi

}

# 日志文件轮转

rotate_log_file() {

local log_file="$1"

if file_exists "$log_file"; then

mv "$log_file" "${log_file}-${date_time}"

fi

}

# 重启 Nginx

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."

exit 1

fi

else

echo "Nginx PID file $nginx_pid_file does not exist."

exit 1

fi

}

# 主逻辑

nginx_log_split() {

local log_file="$nginx_log_file"

if file_exists "$log_file"; then

local log_size=$(stat -c%s "$log_file")

local log_size_mb=$((log_size / 1024 / 1024))

if [ "$log_size_mb" -gt $MAX_LOG_SIZE_MB ]; then

echo "Log file size is greater than ${MAX_LOG_SIZE_MB}MB. Splitting the log file."

rotate_log_file "$log_file"

restart_nginx

split_and_rm_log_file "${log_file}-${date_time}"

elif [ "$log_size_mb" -eq 0 ]; then

echo "Log file size is 0MB. No action needed."

fi

else

echo "Log file $log_file does not exist."

fi

}

# 执行主逻辑

nginx_log_split

```