filebeat:
1.可以在本机收集日志
2.也可以远程收集日志
3.轻量级的日志收集系统，可以在非Java环境运行
logstash是在jvm环境中运行，资源消耗很高，启动一个logstash需要消耗500M左右的内存
filebeat只消耗10M左右的内存

test3是装有logstash的主机,MySQL1是装有nginx,mysql,httpd的服务器
实现在test3上查看nginx,mysql,httpd的日志

#nginx的系统日志格式，filebeat可以直接识别。
yum -y install nginx
systemctl start nginx
systemctl stop firewalld
setenforce 0
#解压缩
rz -E 
filebeat-6.7.2-linux-x86_64.tar.gz
tar -xf filebeat-6.7.2-linux-x86_64.tar.gz
mv filebeat-6.7.2-linux-x86_64 /usr/local/filebeat
cd /usr/local/filebeat
ln -s /usr/local/filebeat/filebeat /usr/local/bin/filebeat
ln -s /usr/local/filebeat/filebeat /usr/local/sbin/filebeat
#进入配置文件
vim filebeat.yml
enable: true
path:
- /var/log/nginx/access.log
- /var/log/nginx/error.log
#开启日志收集，以及确定日志文本的路径，指定标签和发送到目标主机的logstash
tags: ["nginx"]
fields:
  service_name: 192.168.233.90_nginx
  log_type: nginx
  from: 192.168.233.90

path:
- /usr/local/nginx/logs/access.log
- /usr/local/nginx/logs/error.log
tags: ["mysqld"]
fields:
  service_name: 192.168.233.90_mysqld
  log_type: mysqld
  from: 192.168.233.90

path:
- /usr/local/nginx/logs/access.log
- /usr/local/nginx/logs/error.log
tags: ["httpd"]
fields:
  service_name: 192.168.233.90_httpd
  log_type: httpd
  from: 192.168.233.90

#output.elasticsearch
#hosts: ["localhost:9200"]
output.logstash
hosts: [192.168.233.30:5045]

#在命令行输入，可以把运行的日志保存到指定文件
nohup ./filebeat -e -c filebeat.yml > filebeat.out &

在test3上接收，test3要有logshosts

vim nginx_90.conf
input {
	beats {post => "5045"}
}
 output {
 	if "nginx" in [tags] {
 		elasticsearch  {
			hosts => ["192.168.233.10:9200","192.168.233.20:9200"]
			index => "%{[fields][service_name]}-%{+YYYY.MM.dd}"
 		}
 	}
 	
 	 output {
 	if "mysqld" in [tags] {
 		elasticsearch  {
			hosts => ["192.168.233.10:9200","192.168.233.20:9200"]
			index => "%{[fields][service_name]}-%{+YYYY.MM.dd}"
 		}
 	}
 	
 output {
 	if "httpd" in [tags] {
 		elasticsearch  {
			hosts => ["192.168.233.10:9200","192.168.233.20:9200"]
			index => "%{[fields][service_name]}-%{+YYYY.MM.dd}"
 		}
 	}
 }

#启动 Logstash 并指定其配置文件和数据存储路径的命令
logstash -f nginx_90.conf --path.data /opt/test3