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需求描述
日志每天会以天为单位产生一个日志，不清理的话会越来越多。这里写一个Lua自定定时清理日志目录下的日志文件。
依赖安装
安装 lfs 模块
yum install luarocks
yum install lua-develluarocks install luafilesystem创建模拟旧文件
创建了一个1月的旧文件
[root@iZbp1xxxxxxxxxq7ioZ logs]# ll
total 24
-rw-r--r-- 1 app app 5124 Jan 16 15:30 access_api_.json_2024-01-16
-rw-r--r-- 1 app app 8540 Aug 16 2024 access_api_.json_2024-08-16
-rw-r--r-- 1 app app 0 Aug 14 2024 api-error.log
-rw-r--r-- 1 root root 747 Jan 16 16:41 luatest.lua配置文件及脚本
检查配置文件后开始重启，中间的Lua脚本会24小时执行一次，检查目录中是否有180天的日志文件。
user root;
worker_processes 6;
events {worker_connections 30000;
}
http {
# lua环境变量
lua_package_cpath "/usr/lib64/lua/5.1/?.so;;";###init_worker_by_lua_block {local lfs = require "lfs"local function clean_old_logs(premature)if premature thenreturnend-- 日志目录路径local log_path = "/data/logs/"-- 当前时间local current_time = os.time()-- 定义保留天数local retain_days = 180local retain_seconds = retain_days * 24 * 60 * 60-- 遍历日志目录for file in lfs.dir(log_path) do-- 检查文件名是否符合日志格式if file:match("access_api.json_%d%d%d%d%-%d%d%-%d%d") then-- 获取文件的完整路径local file_path = log_path .. file-- 获取文件的属性local attr = lfs.attributes(file_path)if attr thenlocal file_age = current_time - attr.modificationngx.log(ngx.NOTICE, "File: ", file_path, " Age: ", file_age, " Retain seconds: ", retain_seconds)-- 如果文件超过30天，则删除if file_age > retain_seconds thenlocal success, err = os.remove(file_path)if success thenngx.log(ngx.NOTICE, "Deleted old log file: ", file_path)elsengx.log(ngx.ERR, "Failed to delete log file: ", file_path, " Error: ", err)endendelsengx.log(ngx.ERR, "Failed to get attributes for file: ", file_path)endendendend-- 设置定时器，每86400秒（即24小时）执行一次local ok, err = ngx.timer.every(86400, clean_old_logs)if not ok thenngx.log(ngx.ERR, "Failed to create timer: ", err)end}###include mime.types;default_type application/octet-stream;sendfile on;keepalive_timeout 65;###日志格式log_format json escape=json '{"timestamp":"$time_iso8601",''"remote_addr": "$remote_addr", ''"referer": "$http_referer", ''"request": "$request", ''"status": $status, ''"bytes": $body_bytes_sent, ''"agent": "$http_user_agent", ''"x_forwarded": "$http_x_forwarded_for", ''"up_addr": "$upstream_addr",''"up_host": "$upstream_http_host",''"up_resp_time": "$upstream_response_time",''"request_time": "$request_time",''"request_GlobalId": "$http_GlobalId",''"response_GlobalId": "$sent_http_GlobalId"''"response_body": "$resp_body",''"request_body": "$request_body"'' }';###日志按天分割map $time_iso8601 $logdate{'~^(?<ymd>\d{4}-\d{2}-\d{2})' $ymd;default 'date-not-found';}###charset utf-8 ;gzip on;# 后端IP地址upstream api-prod {server 10.66.66.86:8501 max_fails=5 fail_timeout=30s;server 10.66.66.88:8501 max_fails=5 fail_timeout=30s;}server {listen 80 ;listen 7309 ;server_name api.xxxxxx.cn api-test.xxxxxx.cn;charset utf-8 ;#日志配置lua_need_request_body on;set $resp_body "";body_filter_by_lua 'local resp_body = string.sub(ngx.arg[1], 1, 1000)ngx.ctx.buffered = (ngx.ctx.buffered or "") .. resp_bodyif ngx.arg[2] thenngx.var.resp_body = ngx.ctx.bufferedend';location / {proxy_pass http://api-prod;# 屏蔽 SLBHealthCheck 和 Blackbox Exporter/0.21.1 的 404 请求日志if ($http_user_agent ~* "(SLBHealthCheck|Blackbox Exporter/0.21.1)") {access_log off;return 200;}}access_log /data/logs/access_api.json_$logdate json;error_log /data/logs/api-error.log error;
}
}
验证
180天之前的日志文件没有了。
[root@iZbpxxxxxxxxxxxoZ logs]# ll /data/logs
total 16
-rw-r--r-- 1 root root 8540 Aug 16 16:37 access_api.json_2024-08-16
-rw-r--r-- 1 root root 0 Aug 14 16:36 api-error.log
-rw-r--r-- 1 root root 747 Jan 16 2024 luatest.lua