1. 카우치케이스란?

오픈 소스 데이터베이스이다.

도큐먼트 지향 NoSQL 구조이며 (JSON으로 데이터 저장) 얼랭으로 개발되었다.

MVCC(다중 버전 동시성 제어)를 지원하기 때문에 쓰기 작업 중 데이터 파일을 lock하지 않는다. 충돌은 애플리케이션이 해결한다.

2. Couchbase 사용 주요 포트

• 8091 : Web Administration Port
  - Used by the Couchbase Web Console for REST/HTTP traffic.8092 : Couchbase API Port
• 11207 : Internal/External Bucket Port for SSL
  - Used to access views, run queries, XDCR,and update design documents.
• 11209 : Internal Bucket Port
  - Used by smart client libraries to access data nodes using SSL.
• 11210 : Internal/External Bucket Port
  - Used by smart client libraries or Moxi to directly connect to the data nodes.
• 11211 : Client interface (proxy)
  - Used by pre-existing Couchbase and memcached (non-smart) client libraries.
• 11214 : Incoming SSL Proxy
  - Used for SSL XDCR data encryption.
• 11215 : Internal Outgoing SSL Proxy
  - Used for SSL XDCR data encryption.
• 18091 : Internal REST HTTPS for SSL
  - Used by the Couchbase Web Console for REST/HTTP traffic with SSL.
• 18092 : Internal CAPI HTTPS for SSL
  - Used to access views, run queries, XDCR and update design documents with SSL.
• 4369 : Erlang Port Mapper ( epmd )
• 21100 ~ 21299 (inclusive) : Node data exchange

2. 포트 관련 오류

2-1. Failed to reach erlang port mapper 

Failed to reach erlang port mapper. Could not connect to "192.168.1.1" on port "4369". This could be due to an incorrect host/port combination or a firewall in place between the servers