多机集群见我的另一篇文档《docker-compose启动redis多机集群(6台服务器3主3从)》,此处是一个用于学习的伪集群。
1. 伪集群安装
docker-compose.yml
创建redis-cluster目录,目录下创建docker-compose.yml文件如下
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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' |
持久化存储
我们直接启动这些目录是可以创建的,但是容器中没有使用root用户,一般服务器都不会有写权限。因此
- 我们手工创建这些目录,先给读写权限。
- 建议等启动后,看到是对应宿主机哪个用户了,我们再将目录属主改为哪个用户。
创建存储目录
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mkdir redis-cluster_data-{0..5} chmod 777 redis-cluster-data-* |
结果如下
[root@liubei redis-cluster]# ll
总用量 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
启动集群
启动集群
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# docker-compose up -d |
查看结果
[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
进入其中一个容器,执行命令如下:
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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 |
输出如下:
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.
查看集群状态
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redis-cli -h redis-node-0 -a liubei@161 cluster info |
输出信息如下:
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:/$
查看集群节点状态
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redis-cli -h redis-node-0 -a liubei@161 cluster nodes |
输出
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. 测试
读写测试
以集群模式登录
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redis-cli -h redis-nod-1 -a liubei@161 -c |
写入数据
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redis-node-1:6379> set name liubei OK |
在另一个节点上读
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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> |
我们可以看到,连接会跳到存储这个key的节点上(192.168.0.3)。
key所在节点
登录其中一个节点
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redis-cli -h redis-node-0 -a liubei@161 -c |
查看节点哈希槽编号的范围
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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的哈希槽编号
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redis-node-0:6379> cluster keyslot name ( integer ) 5798 |
通过第一步查看节点哈希槽编号的范围我们可以看到5798 这个编号在 192.168.0.3 上
如果我们不用集群模式登录,只能在该节点上读取到这个key值。
集群模式验证是否准确
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redis-node-0:6379> get name -> Redirected to slot [5798] located at 192.168.0.3:6379 "liubei" 192.168.0.3:6379> |
集群模式登录,查找这个key,我们的连接跳到了 192.168.0.3上。
非集群模式登录查看
登录其他节点,会提示我们这个key存在了192.168.0.3上
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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 |
只有登录这个节点才能查询到值
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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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原文链接:https://blog.csdn.net/xingzuo_1840/article/details/125634265