elk搭建方法详见之前一篇文章https://blog.51cto.com/chentianwang/1915326
废话不多说
环境介绍
192.168.102.20 nginx logstash-agent6.1
192.168.102.21 logstash-server6.1 redis-server
一，搭建测试的nginx环境
配置文件如下
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
include /etc/nginx/conf.d/*.conf;
default_type application/octet-stream;
log_format main '{"http_x_forwarded_for":"$http_x_forwarded_for","remote_user":"$remote_user","time_local":"$time_local","request":"$request","status":"$status","body_bytes_sent":"$body_bytes_sent","request_body":"$request_body","http_referer":"$http_referer","remote_addr":"$remote_addr","fastcgi_script_name":"$fastcgi_script_name","request_time":"$request_time","proxy_host":"$proxy_host","upstream_addr":"$upstream_addr","upstream_response_time":"$upstream_response_time","agent":"$http_user_agent"}';
access_log /var/log/nginx/access.log main;
sendfile on;
keepalive_timeout 65;
upstream real_server {
server 127.0.0.1:8080;
}
server {
listen 80;
server_name asd.com;
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://real_server;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}这里要注意 log_format 已经定义好了日志为json格式，方便logstash的获取
access的日志格式为
{"http_x_forwarded_for":"-","remote_user":"-","time_local":"26/Jan/2018:15:32:53 +0800","request":"GET / HTTP/1.1","status":"304","body_bytes_sent":"0","request_body":"-","http_referer":"-","remote_addr":"192.168.102.1","fastcgi_script_name":"/","request_time":"0.001","proxy_host":"real_server","upstream_addr":"127.0.0.1:8080","upstream_response_time":"0.001","agent":"Mozilla/5.0 (Windows NT 10.0; WOW64; rv:57.0) Gecko/20100101 Firefox/57.0"}为了方便测试还会另外起一个8080端口用于upstream测试
server {
server_name 127.0.0.1;
listen 8080 ;
root /data/;
index index.html ;
}二，logstash配置
192.168.102.20
input {
file {
path => "/var/log/nginx/access.log"
}
}
output {
redis {
host => "192.168.102.21" # redis主机地址
port => 6379 # redis端口号
data_type => "list" # 使用发布/订阅模式
key => "nginx_102_20" # 发布通道名称
}
}192.168.102.21
input {
redis {
host => "192.168.102.21" #本地的reds地址
port => 6379 #redis端口
type => "redis-input" #输入类型
data_type => "list" #使用redis的list存储数据
key => "nginx_102_20"
}
}
filter {
json {
source => "message"
}
}
output {
stdout {}
if [status] == "304" {
exec {
command => "python /root/elk_alarm/count.py err_304 %{proxy_host}"
}
}
elasticsearch {
index => "test" #索引信息
hosts => [ "192.168.102.21:9200" ]
}
}这里agent往redis里写数据 server从redis里读数据，并且判断状态码304(方便测试而已具体规则自己定义，也支持and or等)发现后执行python脚本
三，自定义报警脚本
大致意思为发现报警自动往redis增加一条计数器
vim count.py
#!/usr/bin/python
import redis
import sys
f=open("/root/elk_alarm/status.log","a")
f.write(sys.argv[1] + "\n")
f.write(sys.argv[2] + "\n")
f.close()
r = redis.StrictRedis(host='192.168.102.21', port=6379)
count = r.hget(sys.argv[1],sys.argv[2])
if count:
r.hset(sys.argv[1],sys.argv[2],int(count)+1)
else:
r.hset(sys.argv[1],sys.argv[2],1)还要写一个报警脚本,大致是发现304超过3时报警，需要配合crontab定时执行，如果在定义的时间内达不到3就清0，如果大于3就报警
vim check.py
#!/usr/bin/python
# -*- coding: UTF-8 -*-
import redis
import smtplib
from email.mime.text import MIMEText
from email.header import Header
r = redis.StrictRedis(host='192.168.102.21', port=6379)
tengine=[
'err_304',
]
sender = '[email protected]'
receivers = ['[email protected]']
for i in tengine:
print i
print "============================="
for k,v in r.hgetall(i).items():
if int(v) > 3:
print k,v
print "error"
# 三个参数：第一个为文本内容，第二个 plain 设置文本格式，第三个 utf-8 设置编码
mail_msg = "错误Upstream:" + " " + k + "次数:" + " "+ v
message = MIMEText(mail_msg, 'plain', 'utf-8')
message['From'] = Header(sender)
message['To'] = Header("测试", 'utf-8')
subject = 'Log_error_mail'
message['Subject'] = Header(subject, 'utf-8')
try:
smtpObj = smtplib.SMTP('localhost')
smtpObj.sendmail(sender, receivers, message.as_string())
print "邮件发送成功"
except smtplib.SMTPException:
print "Error: 无法发送邮件"
r.hset(i,k,0)
print "-----------------------------------------"
else:
print k,v
print "ok"
print "-----------------------------------------"四，效果
