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실시간 서비스 플랫폼 설계
Node.js 기반의 분산 서버 환경 구축
김요한 (yohany@gmail.com)
기술은 공유되어야 하고,
서비스로 차별화 해야 한다.
김요한 GSSHOP architect
https://www.facebook.com/JohnKim0331
https://github.com/JohnKim
yohany@gmail.com
요즘 유행하는
실시간 서비스 개발하기 위해
분산 서버 구성하고
그리고 운영 하기
Service
 Platform
 ?
scalability
 ?
Monitoring
 ?
1. 실시간 서비스 플랫폼
우리는 왜 플랫폼으로 만들어야 하는가 ?
실시간 서비스 플랫폼
실시간 서비스 ?
https://www.flickr.com/photos/xrrr/1750232320/
FIDS (Flight Information Display System)
실시간 서비스 플랫폼
플랫폼 ?
https://flic.kr/p/ajvCwR
Volkswagen Group Platform
REAL-TIME SERVICE PLATFORM
Dashboards Mobile Notifications
Messengers
is ideal for building dashboards, activity streams, notification
and chat systems, backend-less apps and websites, real-time
collaboration, live statistics, remote controls, multiplayer games,
and more.
REAL-TIME SERVICE PLATFORM
https://www.hydna.com/
https://www.firebase.com/
Start with a Platform ,
and Then Use it for Everything.
2. 분산 서버 설계하기
확장성을 고려한 서버 아키텍처 설계
NodeJS
 +
 Socket.IO,
 NGINX,
 HAPROXY,
 ELB,
 Zookeeper,
 Redis
“무엇으로 만들 것인가 ? ”
가장 많이 사용하고 있는 socket.io
http://socket.io/get-started/chat/
“그런데, 아프리카 처럼 ? ”
서버 하나로는 부족하다!
SCALE UP  SCALE OUT
SCALE UP
Memory
CPU
SCALE OUT
“Scale Out 은,
처음부터 고려하지 않으면 힘들다”
“가장 흔한 방법 부터 적용하자.
하지만 socket.io 에 맞게 해야 한다 ”
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
?
가장 쉬운 방법
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
NGINX
HA PROXY
ELB
Elastic Load Balancing (AWS)
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
NGINX
HA PROXY
ELB
Elastic Load Balancing (AWS)
Websocket 을 지원하지 않는,
IE 에서 socket.io로 접속할 때
xhr-polling
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
NGINX
HA PROXY
ELB
Elastic Load Balancing (AWS)
같은 서버에 polling 해야만 함
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
NGINX
HA PROXY
ELB
Elastic Load Balancing (AWS)
같은 서버에 polling 해야만 함
CHAT SERVERX
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
NGINX
upstream io_nodes {

ip_hash;

server 127.0.0.1:6001;

server 127.0.0.1:6002;

server 127.0.0.1:6003;

server 127.0.0.1:6004;

}
Client 의 IP 를 해싱하여 분배
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
HA PROXY
backend io_nodes

balance source

server 127.0.0.1:6001 . . . .

server 127.0.0.1:6002 . . . .

server 127.0.0.1:6003 . . . .

server 127.0.0.1:6004 . . . .
Client 의 IP 를 해싱하여 분배 (v1.5 부터 SSL 지원)
X
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
ELBElastic Load Balancing (AWS)
X
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
ELBElastic Load Balancing (AWS)
CHAT S
CHAT S
CHAT S
CHAT S
CHAT S
ELBElastic Load Balancing (AWS)
TCP MODE
HA
PROXY
HA
PROXY
“역할 별로 분리 해서 확장하자”
좀더 고민해서,
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
메시지 송신 전용
(HTTP RESTful)
메시지 수신 전용
(socket)
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
HA PROXY
HA PROXY
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
HA PROXY
HA PROXY
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
HA PROXY
HA PROXY
REDIS
publish
subscribe
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
HA PROXY
HA PROXY
REDIS
publish
subscribe
Broker
(pub/sub server)
Publisher
Subscriber 1
Subscriber 2
Subscriber 3
redis rabbitMQ
REST S
REST S
CHAT
CHAT
CHAT
HA PROXY
HA PROXY
REST SERV
REST SERV
CHAT SERV
CHAT SERV
HA PROXY
HA PROXY
관리자가 메시지 발송 !!
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
OXY
OXY
REDIS
publish
subscribe
REST S
REST S
CHAT
CHAT
CHAT
HA PROXY
HA PROXY
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
메시지 송신 전용
(HTTP RESTful)
메시지 수신 전용
(socket)
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT 서버 할당

접속 인증
(HTTP RESTful)
CHAT 메시지 송/수신 전용
(socket)
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT 서버 할당

접속 인증
(HTTP RESTful)
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
HA PROXY
123.0.0.2:9002
123.0.0.1:9001
123.0.0.2:9002
123.0.0.3:9004
어느 서버에
접속해?
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
HA PROXY
123.0.0.2:9002
123.0.0.1:9001
123.0.0.2:9002
123.0.0.3:9004
어느 서버에
접속해?
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
HA PROXY
123.0.0.2:9002
123.0.0.1:9001
123.0.0.2:9002
123.0.0.3:9004
어느 서버에
접속해?
REDIS
ABCDEFG01234인증 토큰
ABCDEFG01234
SET 토큰
GET 토큰
”
“인증 처리 !
OAuth 2.0 로 별도의 서버로 구축한다
”
“인증 처리 !
OAuth 2.0 로 별도의 서버로 구축한다
“인증 처리 !
OAuth 2.0 로 별도의 서버로 구축한다 ”
SPRING SECURITY OAUTH 2
“접속할 서버를 할당하려면 ? ”
먼저, 서버 목록을 가지고 있어야 한다.
REST SERVER
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
123.0.0.1:9001
123.0.0.2:9002
123.0.0.3:9004
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
123.0.0.1:9001
123.0.0.2:9002
123.0.0.3:9004
서버 목록을 모두 가지고 있어야 함.
장애난 서버와 신규 추가된 서버 정보도 동기화 되어야 함
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
123.0.0.1:9001
123.0.0.2:9002
123.0.0.3:9004
zookeeper
watching node
변경된 노드 정보 동기화
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
123.0.0.1:9001
123.0.0.2:9002
123.0.0.3:9004
zookeeper
watching node
변경된 노드 정보 동기화
create EPHEMERAL node
임시 노드로 서버 정보 생성
The King of Coordination
apache zookeeper
- DISTRIBUTED LOCKING
- SERVICE MANAGEMENT
(LOAD BALANCER, DNS . . .)
REST SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
123.0.0.1:9001
123.0.0.2:9002
123.0.0.3:9004
zookeeper
watching node
변경된 노드 정보 동기화
create EPHEMERAL node
임시 노드로 서버 정보 생성
“서버는 어떻게 할당해 주는가?”
같은 채팅방 사람들은 같은 서버에 접속하도록.
같은 채팅방 사람들은 같은 서버에 접속하도록.
Client 의 IP 를 해싱하여 분배
체팅방 키를 해싱하여 분배
NGINX 의 ip_hash
HAPROXY 의 balance source
CONSISTENT HASHING
https://github.com/3rd-Eden/node-hashring
var	
  HashRing	
  =	
  require('hashring');	
  
var	
  ring	
  =	
  new	
  HashRing([	
  
	
  	
  	
  	
  '127.0.0.1',	
  
	
  	
  	
  	
  '127.0.0.2',	
  
	
  	
  	
  	
  '127.0.0.3',	
  	
  
	
  	
  	
  	
  '127.0.0.4'	
  
	
  	
  ]);	
  
ring.get('채팅방키’);	
  //	
  접속	
  서버	
  반환	
  
Weighted CONSISTENT HASHING
https://github.com/3rd-Eden/node-hashring
var	
  HashRing	
  =	
  require('hashring');	
  
var	
  ring	
  =	
  new	
  HashRing({	
  
	
  	
  	
  	
  '127.0.0.1':	
  {	
  weight:	
  200	
  },	
  
	
  	
  	
  	
  '127.0.0.2':	
  {	
  weight:	
  200	
  },	
  
	
  	
  	
  	
  '127.0.0.3':	
  {	
  weight:	
  200	
  },	
  	
  
	
  	
  	
  	
  '127.0.0.4':	
  {	
  weight:	
  1000	
  }	
  
	
  	
  });	
  
ring.get('채팅방키’);	
  //	
  접속	
  서버	
  반환	
  
3. 운영하기
서버 실행 및 모니터링하기
uptime,
 PM2,
 influxDB,
 grafana
https://github.com/foreverjs/forever
A simple CLI tool for ensuring that a given
script runs continuously (i.e. forever).
$ npm install forever -g
$ forever start server.js
https://github.com/Unitech/pm2
PM2 is a production process manager for Node.js
applications with a built-in load balancer .
It allows you to keep applications alive forever ,
to reload them without downtime and to facilitate
common system admin tasks.
$ npm install pm2 -g
$ pm2 start server.js
$ pm2 reload all
$ pm2 startup
-i 0
$ pm2 start server.js -i 0
node process 1
node process 2
node process 3
node process 4
load balancer
cluster mode
$ pm2 reload all
Grafana is a frontend for Graphite, InfluxDB and OpenTSDB
with powerfull visualization features for time series data
InfluxDB
distributed, time series database
with no external dependencies
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
admin
Log Collector
InfluxDB
NGINX +
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
admin
Log Collector
InfluxDB
NGINX
Socket.IO
(separated namespace for monitoring)
{
pid : process.pid,
arch : process.arch,
platform : process.platform,
uptime : process.uptime(),
memory : process.memoryUsage(),
// 그 외
// 서버에 연결된 Client 수
// 체팅방 수 등
}
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
admin
Log Collector
InfluxDB
NGINX
Influx.writePoint()
Socket.IO-client
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
CHAT SERVER
admin
Log Collector
InfluxDB
NGINX +
//	
  nginx	
  설정	
  
auth_basic	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  Restricted;	
  
auth_basic_user_file	
  	
  /path/to/my/htpasswd/file;

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