一,redis cluster命令行
- //集群(cluster)
- CLUSTER INFO 打印集群的信息
- CLUSTER NODES 列出集群当前已知的所有节点(node),以及这些节点的相关信息。
- //节点(node)
- CLUSTER MEET <ip> <port> 将 ip 和 port 所指定的节点添加到集群当中,让它成为集群的一份子。
- CLUSTER FORGET <node_id> 从集群中移除 node_id 指定的节点。
- CLUSTER REPLICATE <node_id> 将当前节点设置为 node_id 指定的节点的从节点。
- CLUSTER SAVECONFIG 将节点的配置文件保存到硬盘里面。
- //槽(slot)
- CLUSTER ADDSLOTS <slot> [slot ...] 将一个或多个槽(slot)指派(assign)给当前节点。
- CLUSTER DELSLOTS <slot> [slot ...] 移除一个或多个槽对当前节点的指派。
- CLUSTER FLUSHSLOTS 移除指派给当前节点的所有槽,让当前节点变成一个没有指派任何槽的节点。
- CLUSTER SETSLOT <slot> NODE <node_id> 将槽 slot 指派给 node_id 指定的节点,如果槽已经指派给另一个节点,那么先让另一个节点删除该槽>,然后再进行指派。
- CLUSTER SETSLOT <slot> MIGRATING <node_id> 将本节点的槽 slot 迁移到 node_id 指定的节点中。
- CLUSTER SETSLOT <slot> IMPORTING <node_id> 从 node_id 指定的节点中导入槽 slot 到本节点。
- CLUSTER SETSLOT <slot> STABLE 取消对槽 slot 的导入(import)或者迁移(migrate)。
- //键 (key)
- CLUSTER KEYSLOT <key> 计算键 key 应该被放置在哪个槽上。
- CLUSTER COUNTKEYSINSLOT <slot> 返回槽 slot 目前包含的键值对数量。
- CLUSTER GETKEYSINSLOT <slot> <count> 返回 count 个 slot 槽中的键。
这些命令是集群所独有的。执行上述命令要先登录
- [[email protected] redis]# redis-cli -c -p 6382 -h 192.168.10.220 //登录
- 192.168.10.220:6382> cluster info //查看集群情况
- 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:8
- cluster_my_epoch:4
- cluster_stats_messages_sent:82753
- cluster_stats_messages_received:82754
二,添加节点
1,新配置二个测试节点
- # cd /etc/redis
- //新增配置
- # cp redis-6379.conf redis-6378.conf && sed -i "s/6379/6378/g" redis-6378.conf
- # cp redis-6382.conf redis-6385.conf && sed -i "s/6382/6385/g" redis-6385.conf
- //启动
- # redis-server /etc/redis/redis-6385.conf > /var/log/redis/redis-6385.log 2>&1 &
- # redis-server /etc/redis/redis-6378.conf > /var/log/redis/redis-6378.log 2>&1 &
2,添加主节点
- # redis-trib.rb add-node 192.168.10.219:6378 192.168.10.219:6379
注释:
192.168.10.219:6378是新增的节点
192.168.10.219:6379集群任一个旧节点
3,添加从节点
- # redis-trib.rb add-node --slave --master-id 03ccad2ba5dd1e062464bc7590400441fafb63f2 192.168.10.220:6385 192.168.10.219:6379
注释:
--slave,表示添加的是从节点
--master-id 03ccad2ba5dd1e062464bc7590400441fafb63f2,主节点的node id,在这里是前面新添加的6378的node id
192.168.10.220:6385,新节点
192.168.10.219:6379集群任一个旧节点
4,重新分配slot
- # redis-trib.rb reshard 192.168.10.219:6378 //下面是主要过程
- How many slots do you want to move (from 1 to 16384)? 1000 //设置slot数1000
- What is the receiving node ID? 03ccad2ba5dd1e062464bc7590400441fafb63f2 //新节点node id
- Please enter all the source node IDs.
- Type ‘all‘ to use all the nodes as source nodes for the hash slots.
- Type ‘done‘ once you entered all the source nodes IDs.
- Source node #1:all //表示全部节点重新洗牌
- Do you want to proceed with the proposed reshard plan (yes/no)? yes //确认重新分
新增加的主节点,是没有slots的,
M: 03ccad2ba5dd1e062464bc7590400441fafb63f2 192.168.10.219:6378
slots:0-332,5461-5794,10923-11255 (0 slots) master
主节点如果没有slots的话,存取数据就都不会被选中。
可以把分配的过程理解成打扑克牌,all表示大家重新洗牌;输入某个主节点的node id,然后在输入done的话,就好比从某个节点,抽牌。
5,查看一下,集群情况
- [[email protected] redis]# redis-trib.rb check 192.168.10.219:6379
- Connecting to node 192.168.10.219:6379: OK
- Connecting to node 192.168.10.220:6385: OK
- Connecting to node 192.168.10.219:6378: OK
- Connecting to node 192.168.10.220:6382: OK
- Connecting to node 192.168.10.220:6383: OK
- Connecting to node 192.168.10.219:6380: OK
- Connecting to node 192.168.10.219:6381: OK
- Connecting to node 192.168.10.220:6384: OK
- >>> Performing Cluster Check (using node 192.168.10.219:6379)
- M: 5d8ef5a7fbd72ac586bef04fa6de8a88c0671052 192.168.10.219:6379
- slots:5795-10922 (5128 slots) master
- 1 additional replica(s)
- S: 9c240333476469e8e2c8e80b089c48f389827265 192.168.10.220:6385
- slots: (0 slots) slave
- replicates 03ccad2ba5dd1e062464bc7590400441fafb63f2
- M: 03ccad2ba5dd1e062464bc7590400441fafb63f2 192.168.10.219:6378
- slots:0-332,5461-5794,10923-11255 (1000 slots) master
- 1 additional replica(s)
- M: 19b042c17d2918fade18a4ad2efc75aa81fd2422 192.168.10.220:6382
- slots:333-5460 (5128 slots) master
- 1 additional replica(s)
- M: b2c50113db7bd685e316a16b423c9b8abc3ba0b7 192.168.10.220:6383
- slots:11256-16383 (5128 slots) master
- 1 additional replica(s)
- S: 6475e4c8b5e0c0ea27547ff7695d05e9af0c5ccb 192.168.10.219:6380
- slots: (0 slots) slave
- replicates 19b042c17d2918fade18a4ad2efc75aa81fd2422
- S: 1ee01fe95bcfb688a50825d54248eea1e6133cdc 192.168.10.219:6381
- slots: (0 slots) slave
- replicates b2c50113db7bd685e316a16b423c9b8abc3ba0b7
- S: 9a2a1d75b8eb47e05eee1198f81a9edd88db5aa1 192.168.10.220:6384
- slots: (0 slots) slave
- replicates 5d8ef5a7fbd72ac586bef04fa6de8a88c0671052
- [OK] All nodes agree about slots configuration.
- >>> Check for open slots...
- >>> Check slots coverage...
- [OK] All 16384 slots covered.
三,改变从节点的master
- //查看一下6378的从节点
- # redis-cli -p 6378 cluster nodes | grep slave | grep 03ccad2ba5dd1e062464bc7590400441fafb63f2
- //将6385加入到新的master
- # redis-cli -c -p 6385 -h 192.168.10.220
- 192.168.10.220:6385> cluster replicate 5d8ef5a7fbd72ac586bef04fa6de8a88c0671052 //新master的node id
- OK
- 192.168.10.220:6385> quit
- //查看新master的slave
- # redis-cli -p 6379 cluster nodes | grep slave | grep 5d8ef5a7fbd72ac586bef04fa6de8a88c0671052
四,删除节点
1,删除从节点
- # redis-trib.rb del-node 192.168.10.220:6385 ‘9c240333476469e8e2c8e80b089c48f389827265‘
2,删除主节点
如果主节点有从节点,将从节点转移到其他主节点
如果主节点有slot,去掉分配的slot,然后在删除主节点
- # redis-trib.rb reshard 192.168.10.219:6378 //取消分配的slot,下面是主要过程
- How many slots do you want to move (from 1 to 16384)? 1000 //被删除master的所有slot数量
- What is the receiving node ID? 5d8ef5a7fbd72ac586bef04fa6de8a88c0671052 //接收6378节点slot的master
- Please enter all the source node IDs.
- Type ‘all‘ to use all the nodes as source nodes for the hash slots.
- Type ‘done‘ once you entered all the source nodes IDs.
- Source node #1:03ccad2ba5dd1e062464bc7590400441fafb63f2 //被删除master的node-id
- Source node #2:done
- Do you want to proceed with the proposed reshard plan (yes/no)? yes //取消slot后,reshard
新增master节点后,也进行了这一步操作,当时是分配,现在去掉。反着的。
- # redis-trib.rb del-node 192.168.10.219:6378 ‘03ccad2ba5dd1e062464bc7590400441fafb63f2‘
新的master节点被删除了,这样就回到了,就是这篇文章开头,还没有添加节点的状态
时间: 2024-10-12 10:35:16