Redis 클러스터

redis logo

클러스터 테스트 환경

• Ubuntu 22.0.4 LTS Version
• VM 3대로 Master-Slave 구성
  • VM 1대에 Redis 2개씩 기동

클러스터

데이터를 자동으로 여러 개의 Redis 노드에 나누어 저장할 수 있는 데이터 샤딩을 제공하며, 노드가 죽거나 통신이 되지 않을 때에도 작업을 계속 할 수 있는 가용성을 제공

클러스터 구성

1. config 파일 구성

cluster-enabled yes 
cluster-config-file nodes-6379.conf
cluster-node-timeout 3000

• cluster-enabled : 클러스터 활성화
• cluster-config-file : 클러스터 구성한 내용을 저장하는 파일명 설정
• cluster-node-timeout : 클러스터 노드가 다운되었는지 확인하는 시간 단위

2. Redis 기동

• 총 6대 기동 (VM 3대에 각 2개씩 기동)

$ redis-server [설정파일].conf

3. 클러스터 구성

$ redis-cli --cluster create [VM 1번 ip]:6379 [VM 2번 ip]:6379 [VM 3번 ip]:6379 [VM 1번 ip]:6380 [VM 2번 ip]:6380 [VM 3번 ip]:6380 --cluster-replicas 1

아래와 같은 메시지가 나오면 클러스터가 구성 됨

Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.219.144:6380 to 192.168.219.143:6379
Adding replica 192.168.219.145:6380 to 192.168.219.144:6379
Adding replica 192.168.219.143:6380 to 192.168.219.145:6379
M: 890f8286f6f0558ac1430c9a87acbbe274548e62 192.168.219.143:6379
slots:[0-5460] (5461 slots) master
M: 62bf7e320925316a41108925ed3090198a726199 192.168.219.144:6379
slots:[5461-10922] (5462 slots) master
M: 3f100b2a6321caa821dd7f266b8da02aa406db12 192.168.219.145:6379
slots:[10923-16383] (5461 slots) master
S: 4a0cc430e7e8c50c525134bafb8a0ee9b6ffcdaf 192.168.219.143:6380
replicates 3f100b2a6321caa821dd7f266b8da02aa406db12
S: aff262e06d68406bbe518baf470e5f0e7058072d 192.168.219.144:6380
replicates 890f8286f6f0558ac1430c9a87acbbe274548e62
S: f9977f6dbd7233146a952aa5de26f6efbf354eeb 192.168.219.145:6380
replicates 62bf7e320925316a41108925ed3090198a726199
Can I set the above configuration? (type 'yes' to accept): yes
Nodes configuration updated
Assign a different config epoch to each node
Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join
.
Performing Cluster Check (using node 192.168.219.143:6379)
M: 890f8286f6f0558ac1430c9a87acbbe274548e62 192.168.219.143:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 3f100b2a6321caa821dd7f266b8da02aa406db12 192.168.219.145:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: aff262e06d68406bbe518baf470e5f0e7058072d 192.168.219.144:6380
slots: (0 slots) slave
replicates 890f8286f6f0558ac1430c9a87acbbe274548e62
S: f9977f6dbd7233146a952aa5de26f6efbf354eeb 192.168.219.145:6380
slots: (0 slots) slave
replicates 62bf7e320925316a41108925ed3090198a726199
M: 62bf7e320925316a41108925ed3090198a726199 192.168.219.144:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 4a0cc430e7e8c50c525134bafb8a0ee9b6ffcdaf 192.168.219.143:6380
slots: (0 slots) slave
replicates 3f100b2a6321caa821dd7f266b8da02aa406db12
[OK] All nodes agree about slots configuration.
Check for open slots...
Check slots coverage...
[OK] All 16384 slots covered.

---

클러스터 확인

• redis-cli 접속하여 확인
  • master, slave 연결 확인 가능

$ redis-cli -p 6379

127.0.0.1:6379> cluster nodes
3f100b2a6321caa821dd7f266b8da02aa406db12 192.168.219.145:6379@16379 master - 0 1687842014097 3 connected 10923-16383
aff262e06d68406bbe518baf470e5f0e7058072d 192.168.219.144:6380@16380 slave 890f8286f6f0558ac1430c9a87acbbe274548e62 0 1687842014503 1 connected
f9977f6dbd7233146a952aa5de26f6efbf354eeb 192.168.219.145:6380@16380 slave 62bf7e320925316a41108925ed3090198a726199 0 1687842014098 2 connected
890f8286f6f0558ac1430c9a87acbbe274548e62 192.168.219.143:6379@16379 myself,master - 0 1687842013000 1 connected 0-5460
62bf7e320925316a41108925ed3090198a726199 192.168.219.144:6379@16379 master - 0 1687842014000 2 connected 5461-10922
4a0cc430e7e8c50c525134bafb8a0ee9b6ffcdaf 192.168.219.143:6380@16380 slave 3f100b2a6321caa821dd7f266b8da02aa406db12 0 1687842014605 3 connected

---

클러스터 해제

• Redis 데이터 삭제

$  redis-cli --cluster call localhost:6379 flushall

• Redis 클러스터 리셋
  • hard : node Id 새로 할당, Epoch 데이터 0으로 초기화
  • soft : 이전 node Id 유지, Epoch 데이터 유지

$ redis-cli --cluster call localhost:6379 cluster reset hard

Calling cluster reset hard

localhost:6379: OK

• 클러스터 해제 확인

$ redis-cli --cluster call localhost:6379 cluster nodes

//클러스터 노드가 1개인 것을 확인

Calling cluster nodes
localhost:6379: 8f7dc25f39d8f4ff0324c290edecd48b3b47682c 192.168.219.143:6379@16379 myself,master - 0 1687849216000 0 connected