docker composeでRedis Clusterを用意する

環境

• Redis: 7.0.5
• Docker: 20.10.17
• macOS: 12.6

準備

以下の3ファイルを用意する

• redis.conf
• Dockerfile
• docker-compose.yml

redis.conf

cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes

Dockerfile

FROM redis:7.0.5
COPY redis.conf /usr/local/etc/redis/redis.conf
CMD [ "redis-server", "/usr/local/etc/redis/redis.conf" ]

docker-compose.yml

version: '3.8'

services:
  redis:
    build:
      context: .
    networks:
      - redis-cluster-network

networks:
  redis-cluster-network:

ネットワーク作成とビルドをする

docker network create redis-cluster-network
docker compose build

コンテナを起動する

docker compose up -d --scale redis=6 

Redis Clusterの作成

各RedisのIPアドレスを取得する

docker network inspect redis-cluster_redis-cluster-network | jq '.[0].Containers | .[].IPv4Address'
"192.168.144.2/20"
"192.168.144.6/20"
"192.168.144.5/20"
"192.168.144.3/20"
"192.168.144.4/20"
"192.168.144.7/20"

以下のコマンドでRedis Clusterの作成する

docker compose exec redis redis-cli --cluster create 192.168.144.2:6379 192.168.144.3:6379 \
192.168.144.4:6379 192.168.144.5:6379 192.168.144.6:6379 192.168.144.7:6379 \
--cluster-replicas 1

しばらく待つと作成が完了する

>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.144.6:6379 to 192.168.144.2:6379
Adding replica 192.168.144.7:6379 to 192.168.144.3:6379
Adding replica 192.168.144.5:6379 to 192.168.144.4:6379
M: 9cdad2e1e8fe6399912d2ab003694a16fb01b4d9 192.168.144.2:6379
   slots:[0-5460] (5461 slots) master
M: 1e35211766d9432edc559f37338addd017a311b2 192.168.144.3:6379
   slots:[5461-10922] (5462 slots) master
M: 97a69a5763721c466eaad8ef395f61348f1feb4a 192.168.144.4:6379
   slots:[10923-16383] (5461 slots) master
S: 6639854f65365da152b34d25eb39befe0dcb2584 192.168.144.5:6379
   replicates 97a69a5763721c466eaad8ef395f61348f1feb4a
S: 853de6f03fbc8cf7af91a8927c2700f05a2b7e0f 192.168.144.6:6379
   replicates 9cdad2e1e8fe6399912d2ab003694a16fb01b4d9
S: 238fbdbed77b1e4e51a0776b48e2236c7b0b7628 192.168.144.7:6379
   replicates 1e35211766d9432edc559f37338addd017a311b2
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 192.168.144.2:6379)
M: 9cdad2e1e8fe6399912d2ab003694a16fb01b4d9 192.168.144.2:6379
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: 6639854f65365da152b34d25eb39befe0dcb2584 192.168.144.5:6379
   slots: (0 slots) slave
   replicates 97a69a5763721c466eaad8ef395f61348f1feb4a
M: 1e35211766d9432edc559f37338addd017a311b2 192.168.144.3:6379
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
M: 97a69a5763721c466eaad8ef395f61348f1feb4a 192.168.144.4:6379
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
S: 853de6f03fbc8cf7af91a8927c2700f05a2b7e0f 192.168.144.6:6379
   slots: (0 slots) slave
   replicates 9cdad2e1e8fe6399912d2ab003694a16fb01b4d9
S: 238fbdbed77b1e4e51a0776b48e2236c7b0b7628 192.168.144.7:6379
   slots: (0 slots) slave
   replicates 1e35211766d9432edc559f37338addd017a311b2
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

動作確認

docker compose exec redis redis-cli -c -h 192.168.144.2
192.168.144.2:6379> set foo bar
-> Redirected to slot [12182] located at 192.168.144.4:6379
OK
192.168.144.4:6379> get foo
"bar"
192.168.144.4:6379> set hello world
-> Redirected to slot [866] located at 192.168.144.2:6379
OK
192.168.144.2:6379> get hello
"world"
192.168.144.2:6379>

おまけ

さくっと動かすならこれでOK

https://github.com/Grokzen/docker-redis-cluster

version: '3.8'

services:
  redis-cluster:
    image: grokzen/redis-cluster:latest
    ports:
      - "7000-7005:7000-7005"
    environment:
      - "INITIAL_PORT=7000"
      - "REDIS_CLUSTER_IP=0.0.0.0"
      - "IP=0.0.0.0"
      - "BIND_ADDRESS=0.0.0.0"