********************* 部署过程 **************************
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
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:
Java代码 收藏代码
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:
Java代码 收藏代码
#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
Java代码 收藏代码
#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
Java代码 收藏代码
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
开发编辑/opt/openresty/nginx/conf/nginx.conf 实现kafka记录nginx日志功能，源码如下:
Java代码 收藏代码
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;
}
}
}
Java代码 收藏代码
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
1:使用任意http请求发送给当前nginx，如:
引用
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/v1?passport=83FBC7337D681E679FFBA1B913E22A0D@qq.sohu.com&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/v1?passport=83FBC7337D681E679FFBA1B913E22A0D@qq.sohu.com
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/v1?passport=83FBC7337D681E679FFBA1B913E22A0D@qq.sohu.com&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/v1?passport=83FBC7337D681E679FFBA1B913E22A0D@qq.sohu.com
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)
********************* 最重要的模块 **************************
nginx配置文件配置如下：
#user nobody;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
#log_format main ‘$remote_addr - $remote_user [$time_local] "$request" ‘
# ‘$status $body_bytes_sent "$http_referer" ‘
# ‘"$http_user_agent" "$http_x_forwarded_for"‘;
#access_log logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
upstream myServer {
server 192.168.0.109:8080 weight=1;
}
lua_package_path "/opt/openresty/lualib/kafka/?.lua;;";
lua_need_request_body on;
server {
listen 80;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location /test1 {
# 请求转向自定义的服务器列表
proxy_pass http://myServer;
}
location /test2 {
# 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 topic = "test"
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 = "192.168.0.109", port = 9092 },
{ host = "192.168.0.110", port = 9092 },
{ host = "192.168.0.101", 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.req.get_uri_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(ngx.req.get_uri_args());
-- 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(topic, nil, message)
if not ok then
ngx.log(ngx.ERR, "kafka send err:", err)
return
end
‘;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache‘s document root
# concurs with nginx‘s one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}
********************* 遇到的坑 **************************
问题概述：
利用server1服务器上的openresty nginx的lua脚本往server5中kafka写数据，发现报错 无法解析主机（no resolver defined to resolve "xxxxx"），xxxxx是某台机器的域名，再后来，经过一天的摸索，发现了问题。
问题原因：
最终发现，原来是openResty不会去解析 host 映射，因为kafka客户端用IP连接后会请求broker，然后去到zookeeper拿到broker集群信息（地址记录是 kafka236:1111），这时候lua消费者拿到的是 kafka236 的IP，
但是又不会通过 host去解析，就会报错无法解析主机的问题。
解决方案
如果存在路由器DNS解析服务，直接在DNS配置个域名解析，再nginx配置里面指向这个DNS服务器即可（没有的话需要自己搭建DNS服务）
nginx.conf配置：
DNS配置：
备注说明：
1、如果kafka服务端配置成IP或者域名，在kafka服务端的本机kafka客户端是无法用localhost连接的(除非服务端也用localhost)
2、如果kafka服务端Listen配置成IP，那么在zookeeper记录的是IP地址
如果kafka服务端Listen配置成域名，那么在zookeeper记录的是域名
如果kafka服务端有advertised.listeners配置成域名，那么zookeeper会记录成域名，不管Listen配置成什么
后来发现
低版本的 openresty-1.7.10.2 ， 在kafka中配置域名或者IP，都可以访问
高版本的 openresty-1.13.6.2 , 在kafka中配置域名无法访问，只能是IP，配置resolver也不行。
OpenResty + Lua + Kafka 实现日志收集系统以及部署过程中遇到的坑
原文：https://www.cnblogs.com/gxyandwmm/p/11298912.html