日度归档：2021 年 07 月 23 日

LINUX

redis学习（10）—redis哈希槽扩容与缩小

1、将节点重新加入集群
6387为主节点，6388为从节点
步骤看上一篇

2、重新分配槽号
redis-cli --cluster reshard 192.168.1.138:6381
说明：
ip:port：为集群中任意一个节点就行
步骤一：

>>> Performing Cluster Check (using node 192.168.1.138:6381)
M: c790b5f9584777ba8d9f96be5fe42b2efe646635 192.168.1.138:6381
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: 7599539245821b1a2e185439f3170b896b287106 192.168.1.138:6388
   slots: (0 slots) slave
   replicates ca77bc2a223c64a7af727b24172ae8f43d3e9b5a
S: b264b25c716863096d0c2fe39483130cbfeba894 192.168.1.138:6385
   slots: (0 slots) slave
   replicates f9200d36046d8325817c8014155e8f9950760da4
S: 33add5fdf6d9cc3eb8656c865403a34b237b4b73 192.168.1.138:6384
   slots: (0 slots) slave
   replicates 691e5855e8f274a6ea61dc95dbed89da87ed6053
S: d7bbc7bb0b501b421d527f6c302a8abe00aa535b 192.168.1.138:6386
   slots: (0 slots) slave
   replicates c790b5f9584777ba8d9f96be5fe42b2efe646635
M: f9200d36046d8325817c8014155e8f9950760da4 192.168.1.138:6383
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
M: ca77bc2a223c64a7af727b24172ae8f43d3e9b5a 192.168.1.138:6387
   slots: (0 slots) master
   1 additional replica(s)
M: 691e5855e8f274a6ea61dc95dbed89da87ed6053 192.168.1.138:6382
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 4096

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LINUX

redis学习（9）—redis集群扩容与缩小

1、准备
回顾，上一篇把6381变成fail，6386变成master
还原：6381重新变成了master，6386变成了slave
docker stop redis-node-6
docker start redis-node-6

2、查看集群信息
登录进容器
redis-cli --cluster check 192.168.1.138:6381

3、增加2台redis节点
mkdir -p /data/redis/share/redis-node-7
mkdir -p /data/redis/share/redis-node-8
docker create --name redis-node-7 --net host --privileged=true -v /data/redis/share/redis-node-7:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6387
docker create --name redis-node-8 --net host --privileged=true -v /data/redis/share/redis-node-8:/data redis:5.0.7 --cluster-enabled yes --appendonly yes --port 6388

继续阅读redis学习（9）—redis集群扩容与缩小 →