docker-compose啟動redis集群的實現步驟
多機集群見我的另一篇文檔《docker-compose啟動redis多機集群（6臺服務器3主3從）》，此處是一個用於學習的偽集群。
1. 偽集群安裝
docker-compose.yml
創建redis-cluster目錄，目錄下創建docker-compose.yml文件如下
version: '2.2' x-image: &default-image bitnami/redis-cluster:7.0 x-restart: &default-restart always services: redis-node-0: image: *default-image restart: *default-restart container_name: redis-node-0 ports: - 6379:6379 volumes: - ./redis-cluster_data-0:/bitnami/redis/data environment: - 'REDIS_PASSWORD=liubei@161' - 'REDIS_NODES=redis-node-0 redis-node-1 redis-node-2 redis-node-3 redis-node-4 redis-node-5' redis-node-1: image: *default-image restart: *default-restart container_name: redis-node-1 ports: - 16379:6379 volumes: - ./redis-cluster_data-1:/bitnami/redis/data environment: - 'REDIS_PASSWORD=liubei@161' - 'REDIS_NODES=redis-node-0 redis-node-1 redis-node-2 redis-node-3 redis-node-4 redis-node-5' redis-node-2: image: *default-image restart: *default-restart container_name: redis-node-2 ports: - 26379:6379 volumes: - ./redis-cluster_data-2:/bitnami/redis/data environment: - 'REDIS_PASSWORD=liubei@161' - 'REDIS_NODES=redis-node-0 redis-node-1 redis-node-2 redis-node-3 redis-node-4 redis-node-5' redis-node-3: image: *default-image restart: *default-restart container_name: redis-node-3 ports: - 36379:6379 volumes: - ./redis-cluster_data-3:/bitnami/redis/data environment: - 'REDIS_PASSWORD=liubei@161' - 'REDIS_NODES=redis-node-0 redis-node-1 redis-node-2 redis-node-3 redis-node-4 redis-node-5' redis-node-4: image: *default-image restart: *default-restart container_name: redis-node-4 ports: - 46379:6379 volumes: - ./redis-cluster_data-4:/bitnami/redis/data environment: - 'REDIS_PASSWORD=liubei@161' - 'REDIS_NODES=redis-node-0 redis-node-1 redis-node-2 redis-node-3 redis-node-4 redis-node-5' redis-node-5: image: *default-image restart: *default-restart container_name: redis-node-5 ports: - 56379:6379 volumes: - ./redis-cluster_data-5:/bitnami/redis/data depends_on: - redis-node-0 - redis-node-1 - redis-node-2 - redis-node-3 - redis-node-4 environment: - 'REDIS_PASSWORD=liubei@161' - 'REDIS_NODES=redis-node-0 redis-node-1 redis-node-2 redis-node-3 redis-node-4 redis-node-5'
持久化存儲
我們直接啟動這些目錄是可以創建的，但是容器中沒有使用root用戶，一般服務器都不會有寫權限。因此
- 我們手工創建這些目錄，先給讀寫權限。
- 建議等啟動後，看到是對應宿主機哪個用戶瞭，我們再將目錄屬主改為哪個用戶。
創建存儲目錄
mkdir redis-cluster_data-{0..5}
chmod 777 redis-cluster-data-*
結果如下
[root@liubei redis-cluster]# ll
總用量 7
-rw-r—– 1 root root 2481 7月 6 10:21 docker-compose.yml
drwxrwxrwx 3 root root 61 7月 6 10:43 redis-cluster_data-0
drwxrwxrwx 3 root root 61 7月 6 10:43 redis-cluster_data-1
drwxrwxrwx 3 root root 61 7月 6 10:43 redis-cluster_data-2
drwxrwxrwx 3 root root 77 7月 6 10:51 redis-cluster_data-3
drwxrwxrwx 3 root root 77 7月 6 10:51 redis-cluster_data-4
drwxrwxrwx 3 root root 77 7月 6 10:51 redis-cluster_data-5
啟動集群
啟動集群
# docker-compose up -d
查看結果
[root@liubei redis-cluster]# docker-compose ps
Name Command State Ports
——————————————————————————-
redis-node-0 /opt/bitnami/scripts/redis … Up 0.0.0.0:6379->6379/tcp
redis-node-1 /opt/bitnami/scripts/redis … Up 0.0.0.0:16379->6379/tcp
redis-node-2 /opt/bitnami/scripts/redis … Up 0.0.0.0:26379->6379/tcp
redis-node-3 /opt/bitnami/scripts/redis … Up 0.0.0.0:36379->6379/tcp
redis-node-4 /opt/bitnami/scripts/redis … Up 0.0.0.0:46379->6379/tcp
redis-node-5 /opt/bitnami/scripts/redis … Up 0.0.0.0:56379->6379/tcp
集群初始化
初始化集群
進入其中一個容器，執行命令如下：
I have no name!@d4a8a3ef35ce:/$ redis-cli -a liubei@161 --cluster create redis-node-0:6379 redis-node-1:6379 redis-node-2:6379 redis-node-3:6379 redis-node-4:6379 redis-node-5:6379 --cluster-replicas 1
輸出如下：
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing hash slots allocation on 6 nodes…
Master[0] -> Slots 0 – 5460
Master[1] -> Slots 5461 – 10922
Master[2] -> Slots 10923 – 16383
Adding replica redis-node-4:6379 to redis-node-0:6379
Adding replica redis-node-5:6379 to redis-node-1:6379
Adding replica redis-node-3:6379 to redis-node-2:6379
M: 4cdf0f24f67eadb3b7a610fd9b5409a571cce8d3 redis-node-0:6379
slots:[0-5460] (5461 slots) master
M: ee85d84a95793ee031a4b45fe3600ef81ecef7d1 redis-node-1:6379
slots:[5461-10922] (5462 slots) master
M: f48ab32421dfe4405b73129d88f64a4ce4d076e3 redis-node-2:6379
slots:[10923-16383] (5461 slots) master
S: 0315d864aec40531c9630d5e21959aea6837236e redis-node-3:6379
replicates f48ab32421dfe4405b73129d88f64a4ce4d076e3
S: ec43dee472ce9f1531ccdbd0853cd672519ec2fe redis-node-4:6379
replicates 4cdf0f24f67eadb3b7a610fd9b5409a571cce8d3
S: c834ba17bfdf0d498533355022e548b040083ed9 redis-node-5:6379
replicates ee85d84a95793ee031a4b45fe3600ef81ecef7d1
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 redis-node-0:6379)
M: 4cdf0f24f67eadb3b7a610fd9b5409a571cce8d3 redis-node-0:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: ec43dee472ce9f1531ccdbd0853cd672519ec2fe 172.29.0.2:6379
slots: (0 slots) slave
replicates 4cdf0f24f67eadb3b7a610fd9b5409a571cce8d3
M: f48ab32421dfe4405b73129d88f64a4ce4d076e3 172.29.0.4:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
M: ee85d84a95793ee031a4b45fe3600ef81ecef7d1 172.29.0.5:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 0315d864aec40531c9630d5e21959aea6837236e 172.29.0.6:6379
slots: (0 slots) slave
replicates f48ab32421dfe4405b73129d88f64a4ce4d076e3
S: c834ba17bfdf0d498533355022e548b040083ed9 172.29.0.7:6379
slots: (0 slots) slave
replicates ee85d84a95793ee031a4b45fe3600ef81ecef7d1
[OK] All nodes agree about slots configuration.
>>> Check for open slots…
>>> Check slots coverage…
[OK] All 16384 slots covered.
查看集群狀態
redis-cli -h redis-node-0 -a liubei@161 cluster info
輸出信息如下：
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:174
cluster_stats_messages_pong_sent:203
cluster_stats_messages_sent:377
cluster_stats_messages_ping_received:198
cluster_stats_messages_pong_received:174
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:377
total_cluster_links_buffer_limit_exceeded:0
I have no name!@c193f9814adb:/$
查看集群節點狀態
redis-cli -h redis-node-0 -a liubei@161 cluster nodes
輸出
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
921dd4fc8977562273e8f0f297d7809f5d785a96 192.168.0.2:6379@16379 myself,master – 0 1657079063000 1 connected 0-5460
e3be1ac5c4b5a8ea5789dd62aaa550cece718504 192.168.0.5:6379@16379 slave 921dd4fc8977562273e8f0f297d7809f5d785a96 0 1657079062000 1 connected
d45ea5232290aefd17ec87229b2b68be76061b84 192.168.0.6:6379@16379 slave 505a1c9a1e3bc8b7685a6cdf6aa1d82bd48cc95f 0 1657079063278 3 connected
88f0d7a2377bf876105925e330793091f2390a20 192.168.0.4:6379@16379 slave 477f835648ca3ddffa48af99a2e162e541277186 0 1657079062274 2 connected
505a1c9a1e3bc8b7685a6cdf6aa1d82bd48cc95f 192.168.0.7:6379@16379 master – 0 1657079064281 3 connected 10923-16383
477f835648ca3ddffa48af99a2e162e541277186 192.168.0.3:6379@16379 master – 0 1657079065285 2 connected 5461-10922
2. 測試
讀寫測試
以集群模式登錄
redis-cli -h redis-nod-1 -a liubei@161 -c
寫入數據
redis-node-1:6379> set name liubei OK
在另一個節點上讀
I have no name!@ab2a18399901:/$ redis-cli -h redis-node-5 -a liubei@161 -c Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. redis-node-5:6379> get name -> Redirected to slot [5798] located at 192.168.0.3:6379 "liubei" 192.168.0.3:6379>
我們可以看到，連接會跳到存儲這個key的節點上（192.168.0.3）。
key所在節點
登錄其中一個節點
redis-cli -h redis-node-0 -a liubei@161 -c
查看節點哈希槽編號的范圍
redis-node-0:6379> cluster slots
1) 1) (integer) 0
2) (integer) 5460
3) 1) "192.168.0.2"
2) (integer) 6379
3) "921dd4fc8977562273e8f0f297d7809f5d785a96"
4) (empty array)
4) 1) "192.168.0.5"
2) (integer) 6379
3) "e3be1ac5c4b5a8ea5789dd62aaa550cece718504"
4) (empty array)
2) 1) (integer) 5461
2) (integer) 10922
3) 1) "192.168.0.3"
2) (integer) 6379
3) "477f835648ca3ddffa48af99a2e162e541277186"
4) (empty array)
4) 1) "192.168.0.4"
2) (integer) 6379
3) "88f0d7a2377bf876105925e330793091f2390a20"
4) (empty array)
3) 1) (integer) 10923
2) (integer) 16383
3) 1) "192.168.0.7"
2) (integer) 6379
3) "505a1c9a1e3bc8b7685a6cdf6aa1d82bd48cc95f"
4) (empty array)
4) 1) "192.168.0.6"
2) (integer) 6379
3) "d45ea5232290aefd17ec87229b2b68be76061b84"
4) (empty array)
查看name的哈希槽編號
redis-node-0:6379> cluster keyslot name (integer) 5798
通過第一步查看節點哈希槽編號的范圍我們可以看到5798 這個編號在 192.168.0.3 上
如果我們不用集群模式登錄，隻能在該節點上讀取到這個key值。
集群模式驗證是否準確
redis-node-0:6379> get name -> Redirected to slot [5798] located at 192.168.0.3:6379 "liubei" 192.168.0.3:6379>
集群模式登錄，查找這個key，我們的連接跳到瞭 192.168.0.3上。
非集群模式登錄查看
登錄其他節點，會提示我們這個key存在瞭192.168.0.3上
I have no name!@ab2a18399901:/$ redis-cli -h 192.168.0.5 -a liubei@161 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.5:6379> get name (error) MOVED 5798 192.168.0.3:6379
隻有登錄這個節點才能查詢到值
I have no name!@ab2a18399901:/$ redis-cli -h 192.168.0.3 -a liubei@161 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.3:6379> get name "liubei"
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