2：ELK分析syslog日志

#配置
mv /etc/filebeat/filebeat.yml  /etc/filebeat/filebeat.yml.bak
vim /etc/filebeat/filebeat.yml
filebeat.prospectors:
- type: log
  enabled: true
  paths:
    - /var/log/messages
  fields：
    log_topics: syslog-1.202
  max_bytes: 1048576

output.logstash:
  hosts: ["127.0.0.1:5044"]

#启动
systemctl start filebeat

#配置从beat 5044端口接收日志，且根据fields建立日志索引
vim /etc/logstash/conf.d/syslog.conf
input {
   beats {
    port => 5044
  }
}

output {
 if[fields][log_topics] == "syslog-1.202" {
  elasticsearch {
    hosts => ["192.168.1.202:9200"]
    index => "syslog-1.202-%{+YYYY.MM}"
  }
 }
}

#启动服务
systemctl start logstash

#日志排查
tailf /var/log/logstash/logstash-plain.log   
tailf /var/log/filebeat/filebeat    

#配置文件语法合规性排查
/usr/share/logstash/bin/logstash --path.settings /etc/logstash -f /etc/logstash/conf.d/syslog.conf --config.test_and_exit
/usr/share/filebeat/bin/filebeat -c /etc/filebeat/filebeat.yml  

#查看索引
curl http://192.168.1.202:9200/_cat/indices?v   
health status index                uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   .kibana              sdsMVkoKQZaZncZf6OXEeg   1   0          1            0      3.7kb          3.7kb
yellow open   syslog-1.202-2018.03 0JDgsgabR16EozrEhVHosA   5   1          4            0     31.5kb         31.5kb

#清空无用索引
curl -XDELETE http://192.168.1.202:9200/+索引名