nginx+lua+kafka实现日志统一收集汇总

转载请注明出处:http://hot66hot.iteye.com/blog/2291916

一:场景描述
对于线上大流量服务或者需要上报日志的nginx服务，每天会产生大量的日志，这些日志非常有价值。可用于计数上报、用户行为分析、接口质量、性能监控等需求。但传统nginx记录日志的方式数据会散落在各自nginx上，而且大流量日志本身对磁盘也是一种冲击。
我们需要把这部分nginx日志统一收集汇总起来,收集过程和结果需要满足如下需求:

• 支持不同业务获取数据,如监控业务，数据分析统计业务，推荐业务等。
• 数据实时性
• 高性能保证

二:技术方案
得益于openresty和kafka的高性能，我们可以非常轻量高效的实现当前需求，架构如下:

方案描述:

• 1:线上请求打向nginx后，使用lua完成日志整理:如统一日志格式，过滤无效请求，分组等。
• 2:根据不同业务的nginx日志,划分不同的topic。
• 3:lua实现producter异步发送到kafka集群。
• 4:对不同日志感兴趣的业务组实时消费获取日志数据。

三:相关技术

• openresty: http://openresty.org
• kafka: http://kafka.apache.org
• lua-resty-kafka: https://github.com/doujiang24/lua-resty-kafka

四:安装配置
为了简单直接，我们采用单机形式配置部署，集群情况类似。
1)准备openresty依赖:

 apt-get install libreadline-dev libncurses5-dev libpcre3-dev libssl-dev perl make build-essential
 # 或者
 yum install readline-devel pcre-devel openssl-devel gcc

2)安装编译openresty:

 #1:安装openresty:
 cd /opt/nginx/ # 安装文件所在目录
 wget https://openresty.org/download/openresty-1.9.7.4.tar.gz
 tar -xzf openresty-1.9.7.4.tar.gz /opt/nginx/

 #配置:
 # 指定目录为/opt/openresty,默认在/usr/local。
 ./configure --prefix=/opt/openresty \
             --with-luajit \
             --without-http_redis2_module \
             --with-http_iconv_module
 make
 make install

3)安装lua-resty-kafka

 #下载lua-resty-kafka:
 wget https://github.com/doujiang24/lua-resty-kafka/archive/master.zip
 unzip lua-resty-kafka-master.zip -d /opt/nginx/

 #拷贝lua-resty-kafka到openresty
 mkdir /opt/openresty/lualib/kafka
 cp -rf /opt/nginx/lua-resty-kafka-master/lib/resty /opt/openresty/lualib/kafka/

4):安装单机kafka

 cd /opt/nginx/
 wget http://apache.fayea.com/kafka/0.9.0.1/kafka_2.10-0.9.0.1.tgz
 tar xvf kafka_2.10-0.9.0.1.tgz

 # 开启单机zookeeper
 nohup sh bin/zookeeper-server-start.sh config/zookeeper.properties > ./zk.log 2>&1 &
 # 绑定broker ip,必须绑定
 #在config/servier.properties下修改host.name
 #host.name={your_server_ip}
 # 启动kafka服务
 nohup sh bin/kafka-server-start.sh config/server.properties > ./server.log 2>&1 &
 # 创建测试topic
 sh bin/kafka-topics.sh --zookeeper localhost:2181 --create --topic test1 --partitions 1 --replication-factor 1

五:配置运行
开发编辑/opt/openresty/nginx/conf/nginx.conf 实现kafka记录nginx日志功能，源码如下:

 worker_processes  12;

 events {
     use epoll;
     worker_connections  65535;
 }

 http {
     include       mime.types;
     default_type  application/octet-stream;
     sendfile        on;
     keepalive_timeout  0;
     gzip on;
     gzip_min_length  1k;
     gzip_buffers     4 8k;
     gzip_http_version 1.1;
     gzip_types       text/plain application/x-javascript text/css application/xml application/X-JSON;
     charset UTF-8;
     # 配置后端代理服务
     upstream rc{
         server 10.10.*.15:8080 weight=5 max_fails=3;
         server 10.10.*.16:8080 weight=5 max_fails=3;
         server 10.16.*.54:8080 weight=5 max_fails=3;
         server 10.16.*.55:8080 weight=5 max_fails=3;
         server 10.10.*.113:8080 weight=5 max_fails=3;
         server 10.10.*.137:8080 weight=6 max_fails=3;
         server 10.10.*.138:8080 weight=6 max_fails=3;
         server 10.10.*.33:8080 weight=4 max_fails=3;
         # 最大长连数
         keepalive 32;
     }
     # 配置lua依赖库地址
     lua_package_path "/opt/openresty/lualib/kafka/?.lua;;";

     server {
         listen       80;
         server_name  localhost;
         location /favicon.ico {
             root   html;
                 index  index.html index.htm;
         }
         location / {
             proxy_connect_timeout 8;
             proxy_send_timeout 8;
             proxy_read_timeout 8;
             proxy_buffer_size 4k;
             proxy_buffers 512 8k;
             proxy_busy_buffers_size 8k;
             proxy_temp_file_write_size 64k;
             proxy_next_upstream http_500 http_502  http_503 http_504  error timeout invalid_header;
             root   html;
             index  index.html index.htm;
             proxy_pass http://rc;
             proxy_http_version 1.1;
             proxy_set_header Connection "";
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             # 使用log_by_lua 包含lua代码,因为log_by_lua指令运行在请求最后且不影响proxy_pass机制
             log_by_lua '
                 -- 引入lua所有api
                 local cjson = require "cjson"
                 local producer = require "resty.kafka.producer"
                 -- 定义kafka broker地址，ip需要和kafka的host.name配置一致
                 local broker_list = {
                     { host = "10.10.78.52", port = 9092 },
                 }
                 -- 定义json便于日志数据整理收集
                 local log_json = {}
                 log_json["uri"]=ngx.var.uri
                 log_json["args"]=ngx.var.args
                 log_json["host"]=ngx.var.host
                 log_json["request_body"]=ngx.var.request_body
                 log_json["remote_addr"] = ngx.var.remote_addr
                 log_json["remote_user"] = ngx.var.remote_user
                 log_json["time_local"] = ngx.var.time_local
                 log_json["status"] = ngx.var.status
                 log_json["body_bytes_sent"] = ngx.var.body_bytes_sent
                 log_json["http_referer"] = ngx.var.http_referer
                 log_json["http_user_agent"] = ngx.var.http_user_agent
                 log_json["http_x_forwarded_for"] = ngx.var.http_x_forwarded_for
                 log_json["upstream_response_time"] = ngx.var.upstream_response_time
                 log_json["request_time"] = ngx.var.request_time
                 -- 转换json为字符串
                 local message = cjson.encode(log_json);
                 -- 定义kafka异步生产者
                 local bp = producer:new(broker_list, { producer_type = "async" })
                 -- 发送日志消息,send第二个参数key,用于kafka路由控制:
                 -- key为nill(空)时，一段时间向同一partition写入数据
                 -- 指定key，按照key的hash写入到对应的partition
                 local ok, err = bp:send("test1", nil, message)

                 if not ok then
                     ngx.log(ngx.ERR, "kafka send err:", err)
                     return
                 end
             ';
         }
         error_page   500 502 503 504  /50x.html;
         location = /50x.html {
             root   html;
         }
     }
 }

六:检测&运行

 # 检测配置,只检测nginx配置是否正确，lua错误日志在nginx的error.log文件中
 ./nginx -t /opt/openresty/nginx/conf/nginx.conf
 # 启动
 ./nginx -c /opt/openresty/nginx/conf/nginx.conf
 # 重启
 ./nginx -s reload

七:测试
1:使用任意http请求发送给当前nginx，如:

引用

http://10.10.78.52/m/personal/AC8E3BC7-6130-447B-A9D6-DF11CB74C3EF/rc/[email protected]&page=2&size=10

2:查看upstream代理是否工作正常
3:查看kafka 日志对应的topic是否产生消息日志，如下:

引用

# 从头消费topic数据命令
sh kafka-console-consumer.sh --zookeeper 10.10.78.52:2181 --topic test1 --from-beginning

效果监测:

4:ab压力测试

引用

#单nginx+upstream测试:
ab -n 10000 -c 100 -k http://10.10.34.15/m/personal/AC8E3BC7-6130-447B-A9D6-DF11CB74C3EF/rc/[email protected]&page=2&size=10

#结果
Server Software:        nginx
Server Hostname:        10.10.34.15
Server Port:            80
Document Path:          /m/personal/AC8E3BC7-6130-447B-A9D6-DF11CB74C3EF/rc/[email protected]
Document Length:        13810 bytes
Concurrency Level:      100
Time taken for tests:   2.148996 seconds
Complete requests:      10000
Failed requests:        9982
   (Connect: 0, Length: 9982, Exceptions: 0)
Write errors:           0
Keep-Alive requests:    0
Total transferred:      227090611 bytes
HTML transferred:       225500642 bytes
Requests per second:    4653.34 [#/sec] (mean)
Time per request:       21.490 [ms] (mean)
Time per request:       0.215 [ms] (mean, across all concurrent requests)
Transfer rate:          103196.10 [Kbytes/sec] received
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.1      0       2
Processing:     5   20  23.6     16     701
Waiting:        4   17  20.8     13     686
Total:          5   20  23.6     16     701
Percentage of the requests served within a certain time (ms)
  50%     16
  66%     20
  75%     22
  80%     25
  90%     33
  95%     41
  98%     48
  99%     69
100%    701 (longest request)

 

引用

#单nginx+upstream+log_lua_kafka接入测试:
ab -n 10000 -c 100 -k http://10.10.78.52/m/personal/AC8E3BC7-6130-447B-A9D6-DF11CB74C3EF/rc/[email protected]&page=2&size=10

#结果
Server Software:        openresty/1.9.7.4
Server Hostname:        10.10.78.52
Server Port:            80
Document Path:          /m/personal/AC8E3BC7-6130-447B-A9D6-DF11CB74C3EF/rc/[email protected]
Document Length:        34396 bytes
Concurrency Level:      100
Time taken for tests:   2.234785 seconds
Complete requests:      10000
Failed requests:        9981
   (Connect: 0, Length: 9981, Exceptions: 0)
Write errors:           0
Keep-Alive requests:    0
Total transferred:      229781343 bytes
HTML transferred:       228071374 bytes
Requests per second:    4474.70 [#/sec] (mean)
Time per request:       22.348 [ms] (mean)
Time per request:       0.223 [ms] (mean, across all concurrent requests)
Transfer rate:          100410.10 [Kbytes/sec] received
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.2      0       3
Processing:     6   20  27.6     17    1504
Waiting:        5   15  12.0     14     237
Total:          6   20  27.6     17    1504
Percentage of the requests served within a certain time (ms)
  50%     17
  66%     19
  75%     21
  80%     23
  90%     28
  95%     34
  98%     46
  99%     67
100%   1004 (longest request)