redis 6.2 集群迁移节点，添加节点，删除节点

本文链接：https://blog.youkuaiyun.com/haveqing/article/details/130425394

一、环境

CentOS 7.9

redis 6.2.11

3台服务器集群，分别装的主和从。

主IP	从复制谁（不是自己）	从复制谁调整后	端口	集群端口	备注
10.10.10.45	10.10.10.52	10.10.10.70	主：6479 从：6579	16479 16579	原主节点原从节点
10.10.10.51	10.10.10.45	10.10.10.45	主：6479 从：6579	16479 16579	原主节点原从节点
10.10.10.52	10.10.10.51	-	主：6479 从：6579	16479 16579	待删除节点待迁移节点
10.10.10.70	-	10.10.10.51	主：6479 从：6579	16479 16579	新增节点

二、迁移操作方式

1、使用redis自带的redis-cli --cluster操作

可在线操作，本文采用这种方式，个人推荐。

[root@test5 bin]# ./redis-cli --cluster help
Cluster Manager Commands:
  create         host1:port1 ... hostN:portN
                 --cluster-replicas <arg>
  check          host:port
                 --cluster-search-multiple-owners
  info           host:port
  fix            host:port
                 --cluster-search-multiple-owners
                 --cluster-fix-with-unreachable-masters
  reshard        host:port
                 --cluster-from <arg>
                 --cluster-to <arg>
                 --cluster-slots <arg>
                 --cluster-yes
                 --cluster-timeout <arg>
                 --cluster-pipeline <arg>
                 --cluster-replace
  rebalance      host:port
                 --cluster-weight <node1=w1...nodeN=wN>
                 --cluster-use-empty-masters
                 --cluster-timeout <arg>
                 --cluster-simulate
                 --cluster-pipeline <arg>
                 --cluster-threshold <arg>
                 --cluster-replace
  add-node       new_host:new_port existing_host:existing_port
                 --cluster-slave
                 --cluster-master-id <arg>
  del-node       host:port node_id
  call           host:port command arg arg .. arg
                 --cluster-only-masters
                 --cluster-only-replicas
  set-timeout    host:port milliseconds
  import         host:port
                 --cluster-from <arg>
                 --cluster-from-user <arg>
                 --cluster-from-pass <arg>
                 --cluster-from-askpass
                 --cluster-copy
                 --cluster-replace
  backup         host:port backup_directory
  help           

For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.

Cluster Manager Options:
  --cluster-yes  Automatic yes to cluster commands prompts

2、使用redis-trib.rb操作

redis-trib.rb是ruby写的，虽然是官方出品，但是已经过时了，改用redis-cli --cluster操作

[root@test5 redis6]# yum install ruby

[root@test5 bin]# cp /opt/redis-6.2.11/src/redis-trib.rb /opt/redis6/bin/

[root@test5 bin]# ./redis-trib.rb info 10.10.10.52:6479
WARNING: redis-trib.rb is not longer available!
You should use redis-cli instead.

All commands and features belonging to redis-trib.rb have been moved
to redis-cli.
In order to use them you should call redis-cli with the --cluster
option followed by the subcommand name, arguments and options.

Use the following syntax:
redis-cli --cluster SUBCOMMAND [ARGUMENTS] [OPTIONS]

Example:
redis-cli --cluster info 10.10.10.52:6479

To get help about all subcommands, type:
redis-cli --cluster help

3、使用redis-shake（阿里）

RedisShake是基于golang编写的用于Redis数据库的同步工具，基于Redis RDB+AOF异步复制实现，可以满足用户在不同架构之前实时数据同步、迁移、容灾、分析、双活等多场景需求。

揭开RedisShake的秘密
【周二开源日第二期】RedisShake — Redis数据同步迁移的必备神器来了！
RedisShake 开源地址：https://github.com/alibaba/RedisShake

redis-shake 3.x 系列文档

redis-shake 支持三种数据迁移模式：sync、restore 和 scan：
使用 filters 做数据清洗
运行日志
运行监控
从常见云厂商迁出数据
常见报错

4、使用dump.rdb，appendonly.aof文件操作

Redis15-redis集群间的数据迁移

三、迁移操作过程

可在新节点操作，中间会多次执行check节点

1、启动新节点（开启集群配置）

/opt/redis6/bin/redis-server /opt/redis6/6479/redis.conf

/opt/redis6/bin/redis-server /opt/redis6/6579/redis.conf

redis.conf

cluster-enabled yes
cluster-config-file /opt/redis6/6479/nodes-6479.conf
#cluster-config-file /opt/redis6/6579/nodes-6579.conf
cluster-node-timeout 15000

2、检查集群

./redis-cli --cluster check 10.10.10.52:6479 -a myPaasword

host：原来的一个主节点

3、添加新主节点

./redis-cli --cluster add-node 10.10.10.70:6479 10.10.10.52:6479 -a myPaasword

前面的是新添加的节点，后面的是集群任意节点

4、迁移slot

./redis-cli --cluster reshard 10.10.10.70:6479 --cluster-from a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 --cluster-to 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d --cluster-slots 5461 --cluster-yes --cluster-timeout 3600000 -a myPaasword

host：最好写局域网IP，不写127.0.0.1（可能容易失败）

--cluster-slots：迁移的solt数量，可通过check查询，如果迁移部分失败后再次迁移，这个数量会变。

--cluster-timeout：超时时间（毫秒），最好写上，要不默认60s，容易失败

迁移slot，中途失败，被迁移的原主节点可能会从master降为slave，被迁移的原从节点可能升级为master，后续可以调整。

5、修复集群

（如果有问题）修复后再次迁移slot

./redis-cli --cluster fix 10.10.10.70:6479 -a myPaasword

6、客户端连接测试

/opt/redis6/bin/redis-cli -c -h 127.0.0.1 -p 6479 -a myPaasword

/opt/redis6/bin/redis-cli -c -h 127.0.0.1 -p 6579 -a myPaasword

7、删除原主节点

./redis-cli --cluster del-node 10.10.10.52:6479 afb78d482884444027f1aef4f54df2bf7da7ccf8 -a myPaasword

8、添加新从节点

./redis-cli --cluster add-node 10.10.10.70:6579 10.10.10.51:6479 --cluster-slave --cluster-master-id fe29e4fdf577ee326bb7a66a7669042c718caff3 -a myPaasword

9、删除原从节点

./redis-cli --cluster del-node 10.10.10.52:6579 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e -a myPaasword

10、检查节点从属关系，调整从属关系

改变当前节点的主

./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword

如果不满意，可以通过replicaof命令调整。

127.0.0.1:6579> replicaof 10.10.10.70 6479 （新版本）

127.0.0.1:6579> slaveof 10.10.10.70 6479 （老版本）

四、操作过程

1、检查集群

[root@test2 bin]# ./redis-cli --cluster check 10.10.10.45:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.45:6479 (a7eb9bf3...) -> 49 keys | 5461 slots | 1 slaves.
10.10.10.52:6479 (afb78d48...) -> 54 keys | 5461 slots | 1 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 49 keys | 5462 slots | 1 slaves.
[OK] 152 keys in 3 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.45:6479)
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots: (0 slots) slave
replicates afb78d482884444027f1aef4f54df2bf7da7ccf8
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

2、添加新主节点
[root@test5 bin]# ./redis-cli --cluster add-node 10.10.10.70:6479 10.10.10.52:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Adding node 10.10.10.70:6479 to cluster 10.10.10.52:6479
>>> Performing Cluster Check (using node 10.10.10.52:6479)
M: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots: (0 slots) slave
replicates afb78d482884444027f1aef4f54df2bf7da7ccf8
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 10.10.10.70:6479 to make it join the cluster.
[OK] New node added correctly.

3、检查集群

[root@test5 bin]# ./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 0 keys | 0 slots | 0 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 53 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 52 keys | 5461 slots | 1 slaves.
10.10.10.52:6479 (afb78d48...) -> 55 keys | 5461 slots | 1 slaves.
[OK] 160 keys in 4 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots: (0 slots) master
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
M: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots: (0 slots) slave
replicates afb78d482884444027f1aef4f54df2bf7da7ccf8
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

4、迁移slot

[root@test5 bin]#./redis-cli --cluster reshard ~~127.0.0.1~~:6479 --cluster-from afb78d482884444027f1aef4f54df2bf7da7ccf8 --cluster-to 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d --cluster-slots 5461 --cluster-yes -a myPaasword
Moving slot 16381 from afb78d482884444027f1aef4f54df2bf7da7ccf8
Moving slot 16382 from afb78d482884444027f1aef4f54df2bf7da7ccf8
Moving slot 16383 from afb78d482884444027f1aef4f54df2bf7da7ccf8
Moving slot 11007 from 10.10.10.52:6479 to 127.0.0.1:6479:
Moving slot 11008 from 10.10.10.52:6479 to 127.0.0.1:6479:
Moving slot 11009 from 10.10.10.52:6479 to 127.0.0.1:6479:
Node 10.10.10.52:6479 replied with error:
IOERR error or timeout reading to target instance

host尝试使用局域网IP，添加超时时间（打开防火墙端口）

[root@test5 bin]# ./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 0 keys | 86 slots | 0 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 52 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 48 keys | 5461 slots | 1 slaves.
10.10.10.45:6579 (a25a2ff5...) -> 56 keys | 5375 slots | 1 slaves.
[OK] 156 keys in 4 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-11008] (86 slots) master
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots: (0 slots) slave
replicates a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
M: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots:[11009-16383] (5375 slots) master
1 additional replica(s)
[ERR] Nodes don't agree about configuration!
>>> Check for open slots...
[WARNING] Node 10.10.10.70:6479 has slots in importing state 11009.
[WARNING] The following slots are open: 11009.
>>> Check slots coverage...
[OK] All 16384 slots covered.

1、修复集群fix（推荐）

2、>cluster setslot 11009 stable

5、修复集群
[root@test5 bin]# ./redis-cli --cluster fix 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 0 keys | 86 slots | 0 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 53 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 52 keys | 5461 slots | 1 slaves.
10.10.10.45:6579 (a25a2ff5...) -> 55 keys | 5375 slots | 1 slaves.
[OK] 160 keys in 4 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-11008] (86 slots) master
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots: (0 slots) slave
replicates a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
M: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots:[11009-16383] (5375 slots) master
1 additional replica(s)
[ERR] Nodes don't agree about configuration!
>>> Check for open slots...
[WARNING] Node 10.10.10.70:6479 has slots in importing state 11009.
[WARNING] The following slots are open: 11009.
>>> Fixing open slot 11009
Set as importing in: 10.10.10.70:6479
>>> Case 2: Moving all the 11009 slot keys to its owner 10.10.10.45:6579
Moving slot 11009 from 10.10.10.70:6479 to 10.10.10.45:6579:
>>> Setting 11009 as STABLE in 10.10.10.70:6479
>>> Check slots coverage...
[OK] All 16384 slots covered.

6、迁移slot
[root@test5 bin]# ./redis-cli --cluster reshard ~~127.0.0.1~~:6479 --cluster-from a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 --cluster-to 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d --cluster-slots 5375 --cluster-yes --cluster-timeout 3600000 -a myPaasword
Moving slot 16380 from a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
Moving slot 16381 from a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
Moving slot 16382 from a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
Moving slot 16383 from a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
Moving slot 11009 from 10.10.10.45:6579 to 127.0.0.1:6479:
Moving slot 11010 from 10.10.10.45:6579 to 127.0.0.1:6479:
Moving slot 11011 from 10.10.10.45:6579 to 127.0.0.1:6479:
Moving slot 11124 from 10.10.10.45:6579 to 127.0.0.1:6479:
Moving slot 11125 from 10.10.10.45:6579 to 127.0.0.1:6479:
Moving slot 11126 from 10.10.10.45:6579 to 127.0.0.1:6479:
Node 10.10.10.45:6579 replied with error:
ERR Target instance replied with error: MOVED 11126 10.10.10.45:6579

检查集群check，修复集群fix

7、检查集群

[root@test5 bin]# ./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 0 keys | 203 slots | 0 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 52 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 53 keys | 5461 slots | 1 slaves.
10.10.10.45:6579 (a25a2ff5...) -> 55 keys | 5258 slots | 1 slaves.
[OK] 160 keys in 4 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-11125] (203 slots) master
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots: (0 slots) slave
replicates a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
M: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots:[11126-16383] (5258 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
[WARNING] Node 10.10.10.70:6479 has slots in importing state 11126.
[WARNING] Node 10.10.10.45:6579 has slots in migrating state 11126.
[WARNING] The following slots are open: 11126.
>>> Check slots coverage...
[OK] All 16384 slots covered.

修复集群fix

8、修复集群

[root@test5 bin]# ./redis-cli --cluster fix 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 0 keys | 203 slots | 0 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 53 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 53 keys | 5461 slots | 1 slaves.
10.10.10.45:6579 (a25a2ff5...) -> 55 keys | 5258 slots | 1 slaves.
[OK] 161 keys in 4 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-11125] (203 slots) master
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots: (0 slots) slave
replicates a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
M: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots:[11126-16383] (5258 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
[WARNING] Node 10.10.10.70:6479 has slots in importing state 11126.
[WARNING] Node 10.10.10.45:6579 has slots in migrating state 11126.
[WARNING] The following slots are open: 11126.
>>> Fixing open slot 11126
Set as migrating in: 10.10.10.45:6579
Set as importing in: 10.10.10.70:6479
>>> Case 1: Moving slot 11126 from 10.10.10.45:6579 to 10.10.10.70:6479
Moving slot 11126 from 10.10.10.45:6579 to 10.10.10.70:6479: .
>>> Check slots coverage...
[OK] All 16384 slots covered.

9、检查集群
[root@test5 bin]# ./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 1 keys | 204 slots | 0 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 53 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 53 keys | 5461 slots | 1 slaves.
10.10.10.45:6579 (a25a2ff5...) -> 54 keys | 5257 slots | 1 slaves.
[OK] 161 keys in 4 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-11126] (204 slots) master
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots: (0 slots) slave
replicates a25a2ff556bc68b96ce55d997aa33ec1ef23ae30
M: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots:[11127-16383] (5257 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.

10、迁移slot
[root@test5 bin]# ./redis-cli --cluster reshard 10.10.10.70:6479 --cluster-from a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 --cluster-to 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d --cluster-slots 5257 --cluster-yes --cluster-timeout 3600000 -a myPaasword
Moving slot 16381 from 10.10.10.45:6579 to 10.10.10.70:6479:
Moving slot 16382 from 10.10.10.45:6579 to 10.10.10.70:6479:
Moving slot 16383 from 10.10.10.45:6579 to 10.10.10.70:6479:
Node 10.10.10.45:6579 replied with error:
ERR Please use SETSLOT only with masters.

这个错误，可忽略，是因为迁移完slot后，节点从主降到从了。

11、检查集群

[root@test5 bin]# ./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 55 keys | 5461 slots | 2 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 53 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 53 keys | 5461 slots | 1 slaves.
[OK] 161 keys in 3 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-16383] (5461 slots) master
2 additional replica(s)
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: afb78d482884444027f1aef4f54df2bf7da7ccf8 10.10.10.52:6479
slots: (0 slots) slave
replicates 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d
S: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots: (0 slots) slave
replicates 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

12、客户端连接测试
[root@test5 mysql-8.0.32]# /opt/redis6/bin/redis-cli -c -h 127.0.0.1 -p 6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6479> set k1 1
OK
127.0.0.1:6479> set k2 2
-> Redirected to slot [449] located at 10.10.10.45:6479
OK
10.10.10.45:6479> set k3 3
OK
10.10.10.45:6479> set k4 4
-> Redirected to slot [8455] located at 10.10.10.51:6479
OK
10.10.10.51:6479> del k1
-> Redirected to slot [12706] located at 10.10.10.70:6479
(integer) 1
10.10.10.70:6479> del k2
-> Redirected to slot [449] located at 10.10.10.45:6479
(integer) 1
10.10.10.45:6479> del k3
(integer) 1
10.10.10.45:6479> del k4
-> Redirected to slot [8455] located at 10.10.10.51:6479
(integer) 1
10.10.10.51:6479>

13、删除原来的主节点
[root@test5 bin]# ./redis-cli --cluster del-node 10.10.10.52:6479 afb78d482884444027f1aef4f54df2bf7da7ccf8 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Removing node afb78d482884444027f1aef4f54df2bf7da7ccf8 from cluster 10.10.10.52:6479
>>> Sending CLUSTER FORGET messages to the cluster...
>>> Sending CLUSTER RESET SOFT to the deleted node.
[root@test5 bin]# ./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 55 keys | 5461 slots | 1 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 52 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 53 keys | 5461 slots | 1 slaves.
[OK] 160 keys in 3 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots: (0 slots) slave
replicates 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

14、添加新从节点
[root@test5 bin]# ./redis-cli --cluster add-node 10.10.10.70:6579 10.10.10.51:6479 --cluster-slave --cluster-master-id fe29e4fdf577ee326bb7a66a7669042c718caff3 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Adding node 10.10.10.70:6579 to cluster 10.10.10.51:6479
>>> Performing Cluster Check (using node 10.10.10.51:6479)
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
S: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots: (0 slots) slave
replicates 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 10.10.10.70:6579 to make it join the cluster.
Waiting for the cluster to join

>>> Configure node as replica of 10.10.10.51:6479.
[OK] New node added correctly.

15、检查集群

[root@test5 bin]# ./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 55 keys | 5461 slots | 1 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 52 keys | 5462 slots | 2 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 53 keys | 5461 slots | 1 slaves.
[OK] 160 keys in 3 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
2 additional replica(s)
S: 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e 10.10.10.52:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 60728de1eedbfed820eecd811b6924bd345c1d45 10.10.10.70:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots: (0 slots) slave
replicates 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

16、删除原来的从节点
[root@test5 bin]# ./redis-cli --cluster del-node 10.10.10.52:6579 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Removing node 99d21673e03a8b7ab47ad1be28fc2b6ee63f391e from cluster 10.10.10.52:6579
>>> Sending CLUSTER FORGET messages to the cluster...
>>> Sending CLUSTER RESET SOFT to the deleted node.

17、检查集群

[root@test5 bin]# ./redis-cli --cluster check 10.10.10.70:6479 -a myPaasword
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.10.10.70:6479 (27e15b4d...) -> 55 keys | 5461 slots | 1 slaves.
10.10.10.51:6479 (fe29e4fd...) -> 52 keys | 5462 slots | 1 slaves.
10.10.10.45:6479 (a7eb9bf3...) -> 53 keys | 5461 slots | 1 slaves.
[OK] 160 keys in 3 masters.
0.01 keys per slot on average.
>>> Performing Cluster Check (using node 10.10.10.70:6479)
M: 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d 10.10.10.70:6479
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
M: fe29e4fdf577ee326bb7a66a7669042c718caff3 10.10.10.51:6479
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
M: a7eb9bf3ad3817659d3a3cb09543600e95b1b987 10.10.10.45:6479
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 60728de1eedbfed820eecd811b6924bd345c1d45 10.10.10.70:6579
slots: (0 slots) slave
replicates fe29e4fdf577ee326bb7a66a7669042c718caff3
S: 244635b346f6190072cd3d9311f52e83ba698f97 10.10.10.51:6579
slots: (0 slots) slave
replicates a7eb9bf3ad3817659d3a3cb09543600e95b1b987
S: a25a2ff556bc68b96ce55d997aa33ec1ef23ae30 10.10.10.45:6579
slots: (0 slots) slave
replicates 27e15b4d0be71f8b8ece05cc6b8d860e123ab54d
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.