多機(jī)集群見(jiàn)我的另一篇文檔《docker-compose啟動(dòng)redis多機(jī)集群（6臺(tái)服務(wù)器3主3從）》，此處是一個(gè)用于學(xué)習(xí)的偽集群。

1. 偽集群安裝

docker-compose.yml

創(chuàng)建redis-cluster目錄，目錄下創(chuàng)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(chǔ)

我們直接啟動(dòng)這些目錄是可以創(chuàng)建的，但是容器中沒(méi)有使用root用戶(hù)，一般服務(wù)器都不會(huì)有寫(xiě)權(quán)限。因此

• 我們手工創(chuàng)建這些目錄，先給讀寫(xiě)權(quán)限。
• 建議等啟動(dòng)后，看到是對(duì)應(yīng)宿主機(jī)哪個(gè)用戶(hù)了，我們?cè)賹⒛夸泴僦鞲臑槟膫€(gè)用戶(hù)。

創(chuàng)建存儲(chǔ)目錄

mkdir redis-cluster_data-{0..5}
chmod 777 redis-cluster-data-*

結(jié)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(dòng)集群

啟動(dòng)集群

# docker-compose up -d 

查看結(jié)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(jìn)入其中一個(gè)容器，執(zhí)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(tài)

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(jié)點(diǎn)狀態(tài)

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(cè)試

讀寫(xiě)測(cè)試

以集群模式登錄

redis-cli -h redis-nod-1  -a liubei@161 -c

寫(xiě)入數(shù)據(jù)

redis-node-1:6379> set name liubei
OK

在另一個(gè)節(jié)點(diǎn)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(huì)跳到存儲(chǔ)這個(gè)key的節(jié)點(diǎn)上（192.168.0.3）。

key所在節(jié)點(diǎn)

登錄其中一個(gè)節(jié)點(diǎn)

redis-cli -h redis-node-0 -a liubei@161 -c

查看節(jié)點(diǎn)哈希槽編號(hào)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(hào)

redis-node-0:6379> cluster keyslot name
(integer) 5798

通過(guò)第一步查看節(jié)點(diǎn)哈希槽編號(hào)的范圍我們可以看到5798 這個(gè)編號(hào)在 192.168.0.3 上

如果我們不用集群模式登錄，只能在該節(jié)點(diǎn)上讀取到這個(gè)key值。

集群模式驗(yàn)證是否準(zhǔn)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(gè)key，我們的連接跳到了 192.168.0.3上。

非集群模式登錄查看

登錄其他節(jié)點(diǎn)，會(huì)提示我們這個(gè)key存在了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

只有登錄這個(gè)節(jié)點(diǎn)才能查詢(xún)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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