docker 安装redis集群配置3主3从，实现hash槽分配存储数据
目录
一、docker集群安装
1.分别在宿主机的/docker/redis下创建每个节点数据同步的目录
2.执行容器启动命令
3.执行命令参数解释：
4.集群节点不够提示：提示需要至少3个master
5.执行命令构建主从关系
6.查看集群状态
二、验证集群hash槽位（slot）自动分配键值
1.传统单机登陆错误示范
2.正确存储键值示范
3.集群检查
一、docker集群安装
1.分别在宿主机的/docker/redis下创建每个节点数据同步的目录
2.执行容器启动命令
docker run -d --name redis-node81 --net host --privileged=true -v /docker/redis/node-6381/data:/data redis --cluster-enabled yes --appendonly yes --port 6381
docker run -d --name redis-node82 --net host --privileged=true -v /docker/redis/node-6382/data:/data redis --cluster-enabled yes --appendonly yes --port 6382
docker run -d --name redis-node83 --net host --privileged=true -v /docker/redis/node-6383/data:/data redis --cluster-enabled yes --appendonly yes --port 6383
docker run -d --name redis-node84 --net host --privileged=true -v /docker/redis/node-6384/data:/data redis --cluster-enabled yes --appendonly yes --port 6384
注意 --cluster-enabled yes 需要跟在镜像后
3.执行命令参数解释：
docker run -d
--name redis-node81
--net host 主机网络
--privileged=true
-v /docker/redis/node-6381/data:/data redis 宿主机文件映射
--cluster-enabled yes 是否开启集群
--appendonly yes 是否开启持久化
--port 6381 端口号
[root@localhost redis]# docker run -d --name redis-node81 --net host --privileged=true -v /docker/redis/node-6381/data:/data redis --cluster-enabled yes --appendonly yes --port 6381
b5ee28798e83842f54dc1fc35f1a10113f257d31209b5719629659137145bc8d
[root@localhost redis]# docker run -d --name redis-node82 --net host --privileged=true -v /docker/redis/node-6382/data:/data redis --cluster-enabled yes --appendonly yes --port 6382
50bab8d93f0a2f3a464fd625bf23ecdd8a2b323d0843ba5fc24b857b659bec1f
[root@localhost redis]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
50bab8d93f0a redis "docker-entrypoint.s…" 3 seconds ago Up 2 seconds redis-node82
b5ee28798e83 redis "docker-entrypoint.s…" 10 minutes ago Up 10 minutes redis-node81
c68e431e7a2d mysql:5.7 "docker-entrypoint.s…" 8 days ago Up 8 days 33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp formysql
d536dd728243 redis "docker-entrypoint.s…" 8 days ago Up 8 days 6379/tcp, 0.0.0.0:6380->6380/tcp, :::6380->6380/tcp forredis2
[root@localhost redis]# docker run -d --name redis-node83 --net host --privileged=true -v /docker/redis/node-6383/data:/data redis --cluster-enabled yes --appendonly yes --port 6383
bf3f7574eeab9830a1fd5d29b76c81164ac3d87acd1d7b6803baeafb9779f1f3
[root@localhost redis]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
bf3f7574eeab redis "docker-entrypoint.s…" 2 seconds ago Up 2 seconds redis-node83
50bab8d93f0a redis "docker-entrypoint.s…" 21 seconds ago Up 20 seconds redis-node82
b5ee28798e83 redis "docker-entrypoint.s…" 10 minutes ago Up 10 minutes redis-node81
c68e431e7a2d mysql:5.7 "docker-entrypoint.s…" 8 days ago Up 8 days 33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp formysql
d536dd728243 redis "docker-entrypoint.s…" 8 days ago Up 8 days 6379/tcp, 0.0.0.0:6380->6380/tcp, :::6380->6380/tcp forredis2
[root@localhost redis]# docker run -d --name redis-node84 --net host --privileged=true -v /docker/redis/node-6384/data:/data redis --cluster-enabled yes --appendonly yes --port 6384
b4f4ed8c22caac25cfeae91dcdc657149b820e10003981a78a676652b6d209dd
[root@localhost redis]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b4f4ed8c22ca redis "docker-entrypoint.s…" 1 second ago Up 1 second redis-node84
bf3f7574eeab redis "docker-entrypoint.s…" 10 seconds ago Up 10 seconds redis-node83
50bab8d93f0a redis "docker-entrypoint.s…" 29 seconds ago Up 28 seconds redis-node82
b5ee28798e83 redis "docker-entrypoint.s…" 10 minutes ago Up 10 minutes redis-node81
c68e431e7a2d mysql:5.7 "docker-entrypoint.s…" 8 days ago Up 8 days 33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp formysql
d536dd728243 redis "docker-entrypoint.s…" 8 days ago Up 8 days 6379/tcp, 0.0.0.0:6380->6380/tcp, :::6380->6380/tcp forredis2
复制代码执行命令构建主从关系创建主从关系
4.集群节点不够提示：提示需要至少3个master
root@localhost:/data# redis-cli --cluster create 192.168.2.252:6381 192.168.2.252:6382 192.168.2.252:6383 192.168.2.252:6384 --cluster-replicas 1
*** ERROR: Invalid configuration for cluster creation.
*** Redis Cluster requires at least 3 master nodes.
*** This is not possible with 4 nodes and 1 replicas per node.
*** At least 6 nodes are required.
复制代码docker run -d --name redis-node85 --net host --privileged=true -v /docker/redis/node-6385/data:/data redis --cluster-enabled yes --appendonly yes --port 6385
docker run -d --name redis-node86 --net host --privileged=true -v /docker/redis/node-6386/data:/data redis --cluster-enabled yes --appendonly yes --port 6386
5.执行命令构建主从关系
root@localhost:/data# redis-cli --cluster create 192.168.2.252:6381 192.168.2.252:6382 192.168.2.252:6383 192.168.2.252:6384 192.168.2.252:6385 192.168.2.252:6386 --cluster-replicas 1
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.2.252:6385 to 192.168.2.252:6381
Adding replica 192.168.2.252:6386 to 192.168.2.252:6382
Adding replica 192.168.2.252:6384 to 192.168.2.252:6383
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: c4e09a1bf36b4aa79b744b39aabe809df1bd29c8 192.168.2.252:6381
slots:[0-5460] (5461 slots) master
M: 2de30f0b227b2d30602f14ec69b84d54e3b22af9 192.168.2.252:6382
slots:[5461-10922] (5462 slots) master
M: 8996d0476951fba537d26b513721c27981f0ddd6 192.168.2.252:6383
slots:[10923-16383] (5461 slots) master
S: 12a22d510b2b590b7407877bd310263409b88893 192.168.2.252:6384
replicates 8996d0476951fba537d26b513721c27981f0ddd6
S: 23a94ab62fcefb1112ba88ebe65a198bc540b721 192.168.2.252:6385
replicates c4e09a1bf36b4aa79b744b39aabe809df1bd29c8
S: 8e7560aa024a53ed0ed93ab7b6b43189cb0c0ef7 192.168.2.252:6386
replicates 2de30f0b227b2d30602f14ec69b84d54e3b22af9
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 192.168.2.252:6381)
M: c4e09a1bf36b4aa79b744b39aabe809df1bd29c8 192.168.2.252:6381
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 2de30f0b227b2d30602f14ec69b84d54e3b22af9 192.168.2.252:6382
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 12a22d510b2b590b7407877bd310263409b88893 192.168.2.252:6384
slots: (0 slots) slave
replicates 8996d0476951fba537d26b513721c27981f0ddd6
M: 8996d0476951fba537d26b513721c27981f0ddd6 192.168.2.252:6383
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 8e7560aa024a53ed0ed93ab7b6b43189cb0c0ef7 192.168.2.252:6386
slots: (0 slots) slave
replicates 2de30f0b227b2d30602f14ec69b84d54e3b22af9
S: 23a94ab62fcefb1112ba88ebe65a198bc540b721 192.168.2.252:6385
slots: (0 slots) slave
replicates c4e09a1bf36b4aa79b744b39aabe809df1bd29c8
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
root@localhost:/data#
复制代码
注意看hash槽分配到3个主节点的槽点值区间
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
复制代码分别代表如果存入的键名通过计算得到的值落在哪个数值区间，则存到哪个节点下
6.查看集群状态
root@localhost:/data# redis-cli -p 6381
127.0.0.1:6381> CLUSTER info
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:470
cluster_stats_messages_pong_sent:484
cluster_stats_messages_sent:954
cluster_stats_messages_ping_received:479
cluster_stats_messages_pong_received:470
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:954
127.0.0.1:6381> CLUSTER nodes
2de30f0b227b2d30602f14ec69b84d54e3b22af9 192.168.2.252:6382@16382 master - 0 1654852981329 2 connected 5461-10922
12a22d510b2b590b7407877bd310263409b88893 192.168.2.252:6384@16384 slave 8996d0476951fba537d26b513721c27981f0ddd6 0 1654852980326 3 connected
8996d0476951fba537d26b513721c27981f0ddd6 192.168.2.252:6383@16383 master - 0 1654852979324 3 connected 10923-16383
8e7560aa024a53ed0ed93ab7b6b43189cb0c0ef7 192.168.2.252:6386@16386 slave 2de30f0b227b2d30602f14ec69b84d54e3b22af9 0 1654852979000 2 connected
23a94ab62fcefb1112ba88ebe65a198bc540b721 192.168.2.252:6385@16385 slave c4e09a1bf36b4aa79b744b39aabe809df1bd29c8 0 1654852980000 1 connected
c4e09a1bf36b4aa79b744b39aabe809df1bd29c8 192.168.2.252:6381@16381 myself,master - 0 1654852979000 1 connected 0-5460
复制代码
二、验证集群hash槽位（slot）自动分配键值
1.传统单机登陆错误示范
传统登陆方式，无法正常存储非属于当前节点上的槽点的值而报错
root@localhost:/data# redis-cli -p 6381
127.0.0.1:6381> keys *
(empty array)
127.0.0.1:6381> set a 1
(error) MOVED 15495 192.168.2.252:6383
127.0.0.1:6381> get a
(error) MOVED 15495 192.168.2.252:6383
127.0.0.1:6381> set b 2
OK
127.0.0.1:6381> get b
"2"
127.0.0.1:6381>
复制代码可以看到 报错：“(error) MOVED 15495 192.168.2.252:6383 ”
是因为集群自动分配槽位， a对应的槽位15495 对应的是6383的节点
2.正确存储键值示范
集群的正确链接方式是在链接命令后面带上参数 “-c”
当存入键值时，对键key进行CRC16校验后，对16384取余计算，得出的值，redis会自动分配到对应的槽位，并重定向到对应的节点下
root@localhost:/data# redis-cli -p 6381 -c
127.0.0.1:6381> keys *
1) "b"
127.0.0.1:6381> FLUSHALL
OK
127.0.0.1:6381> keys *
(empty array)
127.0.0.1:6381> set a 1
-> Redirected to slot [15495] located at 192.168.2.252:6383
OK
192.168.2.252:6383> keys *
1) "a"
192.168.2.252:6383> set b 2
-> Redirected to slot [3300] located at 192.168.2.252:6381
OK
192.168.2.252:6381> set c 3
-> Redirected to slot [7365] located at 192.168.2.252:6382
OK
192.168.2.252:6382> keys *
1) "c"
复制代码3.集群检查
root@localhost:/data# redis-cli --cluster check 192.168.2.252:6381
192.168.2.252:6381 (c4e09a1b...) -> 1 keys | 5461 slots | 1 slaves.
192.168.2.252:6382 (2de30f0b...) -> 1 keys | 5462 slots | 1 slaves.
192.168.2.252:6383 (8996d047...) -> 1 keys | 5461 slots | 1 slaves.
[OK] 3 keys in 3 masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 192.168.2.252:6381)
M: c4e09a1bf36b4aa79b744b39aabe809df1bd29c8 192.168.2.252:6381
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 2de30f0b227b2d30602f14ec69b84d54e3b22af9 192.168.2.252:6382
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 12a22d510b2b590b7407877bd310263409b88893 192.168.2.252:6384
slots: (0 slots) slave
replicates 8996d0476951fba537d26b513721c27981f0ddd6
M: 8996d0476951fba537d26b513721c27981f0ddd6 192.168.2.252:6383
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 8e7560aa024a53ed0ed93ab7b6b43189cb0c0ef7 192.168.2.252:6386
slots: (0 slots) slave
replicates 2de30f0b227b2d30602f14ec69b84d54e3b22af9
S: 23a94ab62fcefb1112ba88ebe65a198bc540b721 192.168.2.252:6385
slots: (0 slots) slave
replicates c4e09a1bf36b4aa79b744b39aabe809df1bd29c8
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
root@localhost:/data#
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作者：Forpastime
关联链接：https://juejin.cn/post/7108665031600341022