本文转自：http://blog.joylau.cn/2018/05/08/Filebeat-Nginx/ 


  1. Filebeat 版本为 5.3.0
    之所以使用 beats 家族的 Filebeat 来替代 Logstash 是因为 Logstash 实在太消耗资源了（服务器资源充足的土豪请无视）
    在官网下载 Logstash 有 89M，而 Filebeat 才8.4M，由此可见一斑
    Logstash 可以配置 jvm 参数，经过我本身的调试，内存分配小了，启动很慢有时根本起不来，分配大了，其他服务就没有资源了
    所有说对于配置低的服务器，选择 Filebeat 是最好的选择了，而且现在 Filebeat 已经开始替代 Logstash 了

  2. 依然需要修改 nginx 的日志格式

nginx.config

更改日志记录的格式

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log_format json '{ "@timestamp": "$time_iso8601", '
                         '"time": "$time_iso8601", '
                         '"remote_addr": "$remote_addr", '
                         '"remote_user": "$remote_user", '
                         '"body_bytes_sent": "$body_bytes_sent", '
                         '"request_time": "$request_time", '
                         '"status": "$status", '
                         '"host": "$host", '
                         '"request": "$request", '
                         '"request_method": "$request_method", '
                         '"uri": "$uri", '
                         '"http_referrer": "$http_referer", '
                         '"body_bytes_sent":"$body_bytes_sent", '
                         '"http_x_forwarded_for": "$http_x_forwarded_for", '
                         '"http_user_agent": "$http_user_agent" '
                    '}';

    access_log  /var/log/nginx/access.log  json;

filebeat.yml

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#=========================== Filebeat prospectors =============================

filebeat.prospectors:

- input_type: log

  # Paths that should be crawled and fetched. Glob based paths.
  paths:
    - /var/log/nginx/*access*.log
  json.keys_under_root: true
  json.overwrite_keys: true

#-------------------------- Elasticsearch output ------------------------------
output.elasticsearch:
  # Array of hosts to connect to.
  hosts: ["ip:port","ip:port"]
  index: "filebeat_server_nginx_%{+YYYY-MM}"

这里面需要注意的是
json.keys_under_root： 默认这个值是FALSE的，也就是我们的json日志解析后会被放在json键上。设为TRUE，所有的keys就会被放到根节点
json.overwrite_keys: 是否要覆盖原有的key，这是关键配置，将keys_under_root设为TRUE后，再将overwrite_keys也设为TRUE，就能把filebeat默认的key值给覆盖了

还有其他的配置
json.add_error_key：添加json_error key键记录json解析失败错误
json.message_key：指定json日志解析后放到哪个key上，默认是json，你也可以指定为log等。

说白了，差别就是，未配置前elasticsearch的数据是这样的：

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{
	"_index": "filebeat_server_nginx_2018-05",
	"_type": "log",
	"_id": "AWM9sVOkCcRcg0IPg399",
	"_version": 1,
	"_score": 1,
	"_source": {
		"@timestamp": "2018-05-08T03:00:17.544Z",
		"beat": {
			"hostname": "VM_252_18_centos",
			"name": "VM_252_18_centos",
			"version": "5.3.0"
		},
		"input_type": "log",
		"json": {},
		"message": "{ "@timestamp": "2018-05-08T11:00:11+08:00", "time": "2018-05-08T11:00:11+08:00", "remote_addr": "113.16.251.67", "remote_user": "-", "body_bytes_sent": "403", "request_time": "0.000", "status": "200", "host": "blog.joylau.cn", "request": "GET /img/%E7%BD%91%E6%98%93%E4%BA%91%E9%9F%B3%E4%B9%90.png HTTP/1.1", "request_method": "GET", "uri": "/img/\xE7\xBD\x91\xE6\x98\x93\xE4\xBA\x91\xE9\x9F\xB3\xE4\xB9\x90.png", "http_referrer": "http://blog.joylau.cn/css/style.css", "body_bytes_sent":"403", "http_x_forwarded_for": "-", "http_user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36" }",
		"offset": 7633,
		"source": "/var/log/nginx/access.log",
		"type": "log"
	}
}

配置后，是这样的：

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{
	"_index": "filebeat_server_nginx_2018-05",
	"_type": "log",
	"_id": "AWM9rjLd8mVZNgvhdnN9",
	"_version": 1,
	"_score": 1,
	"_source": {
		"@timestamp": "2018-05-08T02:56:50.000Z",
		"beat": {
			"hostname": "VM_252_18_centos",
			"name": "VM_252_18_centos",
			"version": "5.3.0"
		},
		"body_bytes_sent": "12576",
		"host": "blog.joylau.cn",
		"http_referrer": "http://blog.joylau.cn/",
		"http_user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36",
		"http_x_forwarded_for": "-",
		"input_type": "log",
		"offset": 3916,
		"remote_addr": "60.166.12.138",
		"remote_user": "-",
		"request": "GET /2018/03/01/JDK8-Stream-Distinct/ HTTP/1.1",
		"request_method": "GET",
		"request_time": "0.000",
		"source": "/var/log/nginx/access.log",
		"status": "200",
		"time": "2018-05-08T10:56:50+08:00",
		"type": "log",
		"uri": "/2018/03/01/JDK8-Stream-Distinct/index.html"
	}
}