Redis Cluster 分布式集群（下）

2023-02-12 08:04:34

Redis Cluster 搭建（工具）

环境准备

节点 IP 端口
节点① 172.16.1.121 6379，6380
节点② 172.16.1.122 6379，6380
节点③ 172.16.1.123 6379，6380

搭建 Redis 多实例

# 删除以前的 Redis 数据

[root@dbtest01 ~]# rm -rf /service/redis/*

# 创建多实例目录

[root@dbtest01 ~]# mkdir /service/redis/{6379,6380}

[root@dbtest02 ~]# mkdir /service/redis/{6379,6380}

[root@dbtest03 ~]# mkdir /service/redis/{6379,6380}

# 配置所有 Redis

[root@dbtest01 ~]# vim /service/redis/6379/redis.conf

bind 172.16.1.121 127.0.0.1

port 6379

daemonize yes

pidfile /service/redis/6379/redis.pid

loglevel notice

logfile /service/redis/6379/redis.log

dbfilename dump.rdb

dir /service/redis/6379

cluster-enabled yes

cluster-config-file nodes.conf

cluster-node-timeout 5000

[root@dbtest01 ~]# vim /service/redis/6380/redis.conf

bind 172.16.1.121 127.0.0.1

port 6380

daemonize yes

pidfile /service/redis/6380/redis.pid

loglevel notice

logfile /service/redis/6380/redis.log

dbfilename dump.rdb

dir /service/redis/6380

cluster-enabled yes

cluster-config-file nodes.conf

cluster-node-timeout 5000

启动 Redis 多实例

[root@dbtest01 ~]# redis-server /service/redis/6379/redis.conf

[root@dbtest01 ~]# redis-server /service/redis/6380/redis.conf

[root@dbtest02 ~]# redis-server /service/redis/6379/redis.conf

[root@dbtest02 ~]# redis-server /service/redis/6380/redis.conf

[root@dbtest03 ~]# redis-server /service/redis/6379/redis.conf

[root@dbtest03 ~]# redis-server /service/redis/6380/redis.conf

安装插件

# 配置 EPEL 源，安装 ruby 支持

[root@dbtest01 ~]# yum install ruby rubygems -y

# 查看 gem 源

[root@dbtest01 ~]# gem sources -l

*** CURRENT SOURCES ***

http://rubygems.org/

# 添加阿里云 gem 源

[root@dbtest01 ~]# gem sources -a http://mirrors.aliyun.com/rubygems/

http://mirrors.aliyun.com/rubygems/ added to sources 

# 删除国外 gem 源

[root@dbtest01 ~]# gem sources  --remove https://rubygems.org/

http://rubygems.org/ removed from sources

# 再次查看 gem 源

[root@dbtest01 ~]# gem sources -l

# 使用 gem 安装 redis 的 ruby 插件

[root@dbtest01 ~]# gem install redis -v 3.3.3

Successfully installed redis-3.3.3

1 gem installed

Installing ri documentation for redis-3.3.3...

Installing RDoc documentation for redis-3.3.3...

命令工具

# redis-trib.rb 是做分布式集群的命令工具，是 Redis 自带的，但需要 Ruby 插件支持才能使用

[root@dbtest01 ~]# redis-trib.rb

create			# 创建一个集群

check			# 检查集群

info			# 集群状态

fix				# 修复集群

reshard			# 重新分配槽位

rebalance		# 平衡槽位数量

add-node		# 添加节点

del-node		# 删除节点

set-timeout		# 设置超时时间

call			# 向集群所有机器输入命令

import			# 导入数据

help            # 帮助

关联所有节点

# 选项–replicas 1 表示我们希望为集群中的每个主节点创建一个从节点

[root@dbtest01 6380]# redis-trib.rb create --replicas 1 172.16.1.121:6379 172.16.1.122:6379 172.16.1.123:6379 172.16.1.122:6380 172.16.1.123:6380 172.16.1.121:6380

>>> Creating cluster

>>> Performing hash slots allocation on 6 nodes...

Using 3 masters:

172.16.1.121:6379

172.16.1.122:6379

172.16.1.123:6379

Adding replica 172.16.1.122:6380 to 172.16.1.121:6379

Adding replica 172.16.1.121:6380 to 172.16.1.122:6379

Adding replica 172.16.1.123:6380 to 172.16.1.123:6379

M: 85622647ecc43b13ea10083aa59e73399a30b75f 172.16.1.121:6379

   slots:0-5460 (5461 slots) master

M: 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 172.16.1.122:6379

   slots:5461-10922 (5462 slots) master

M: 98f828cce3188a3f670dbbd9f77b5723df6cf53b 172.16.1.123:6379

   slots:10923-16383 (5461 slots) master

S: 92bf59c43755c92953e50dda2c7d806bbb9d5f7b 172.16.1.122:6380

   replicates 85622647ecc43b13ea10083aa59e73399a30b75f

S: cd7afafbf822fb17c26e0e45c921dfa94d8526b9 172.16.1.123:6380

   replicates 98f828cce3188a3f670dbbd9f77b5723df6cf53b

S: ed5d625d41f5c3621bdd068dbd0c2c30bc4c0649 172.16.1.121:6380

   replicates 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9

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 172.16.1.121:6379)

M: 85622647ecc43b13ea10083aa59e73399a30b75f 172.16.1.121:6379

   slots:0-5460 (5461 slots) master

   1 additional replica(s)

M: 98f828cce3188a3f670dbbd9f77b5723df6cf53b 172.16.1.123:6379

   slots:10923-16383 (5461 slots) master

   1 additional replica(s)

S: cd7afafbf822fb17c26e0e45c921dfa94d8526b9 172.16.1.123:6380

   slots: (0 slots) slave

   replicates 98f828cce3188a3f670dbbd9f77b5723df6cf53b

M: 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 172.16.1.122:6379

   slots:5461-10922 (5462 slots) master

   1 additional replica(s)

S: ed5d625d41f5c3621bdd068dbd0c2c30bc4c0649 172.16.1.121:6380

   slots: (0 slots) slave

   replicates 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9

S: 92bf59c43755c92953e50dda2c7d806bbb9d5f7b 172.16.1.122:6380

   slots: (0 slots) slave

   replicates 85622647ecc43b13ea10083aa59e73399a30b75f

[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

[root@dbtest01 6380]# redis-cli -h 172.16.1.121 -p 6379 CLUSTER NODES

98f828cce3188a3f670dbbd9f77b5723df6cf53b 172.16.1.123:6379 master - 0 1596788944243 3 connected 10923-16383

cd7afafbf822fb17c26e0e45c921dfa94d8526b9 172.16.1.123:6380 slave 98f828cce3188a3f670dbbd9f77b5723df6cf53b 0 1596788945754 5 connected

0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 172.16.1.122:6379 master - 0 1596788943739 2 connected 5461-10922

85622647ecc43b13ea10083aa59e73399a30b75f 172.16.1.121:6379 myself,master - 0 0 1 connected 0-5460

ed5d625d41f5c3621bdd068dbd0c2c30bc4c0649 172.16.1.121:6380 slave 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 0 1596788945250 6 connected

92bf59c43755c92953e50dda2c7d806bbb9d5f7b 172.16.1.122:6380 slave 85622647ecc43b13ea10083aa59e73399a30b75f 0 1596788944745 4 connected

重新配置主从

由于使用工具，始终有一台机器从库本机的从库，所以要重新分配主从 ~ ~ ~

# 由于使用工具，始终有一台机器从库本机的从库，所以要重新分配主从

172.16.1.122:6380> CLUSTER REPLICATE 98f828cce3188a3f670dbbd9f77b5723df6cf53b

OK

172.16.1.123:6380> CLUSTER REPLICATE 85622647ecc43b13ea10083aa59e73399a30b75f

OK

插入数据测试

# 执行脚本

[root@dbtest01 ~]# cat data.sh

#!/bin/bash

for i in {1..1000};do

         redis-cli  -c -h 172.16.1.121 -p 6379 SET k${i} v${i}

done
# 查看槽位分布，数据（keys）分布

[root@dbtest01 ~]# redis-trib.rb info 172.16.1.121:6379

172.16.1.121:6379 (85622647...) -> 341 keys | 5461 slots | 1 slaves.

172.16.1.123:6379 (98f828cc...) -> 327 keys | 5461 slots | 1 slaves.

172.16.1.122:6379 (0f0232ee...) -> 332 keys | 5462 slots | 1 slaves.

[OK] 1000 keys in 3 masters.

0.06 keys per slot on average.

Redis 集群节点修改

①. — 新节点添加槽位

②. — 源节点中的数据进行迁移

③. — 源节点数据迁移完毕

④. — 迁移下一个槽位的数据，依次循环

添加节点

准备新机器

# 此处没有另外准备新的虚拟机，暂时在 dbtest03 上添加 2 个实例，即一对主从节点

[root@dbtest03 ~]# mkdir /service/redis/{6381,6382}

[root@dbtest03 ~]# vim /service/redis/6381/redis.conf

[root@dbtest03 ~]# vim /service/redis/6382/redis.conf

# 启动新节点

[root@dbtest03 ~]# redis-server /service/redis/6381/redis.conf

[root@dbtest03 ~]# redis-server /service/redis/6382/redis.conf

关联新节点

# 关联新的节点到 Redis 分布式集群中

[root@dbtest03 ~]# redis-trib.rb add-node 172.16.1.123:6381 172.16.1.121:6379

[root@dbtest03 ~]# redis-trib.rb add-node 172.16.1.123:6382 172.16.1.121:6379

# 或者

[root@dbtest03 ~]# redis-cli -p 6379 -h 172.16.1.121 cluster meet 172.16.1.123 6381

[root@dbtest03 ~]# redis-cli -p 6379 -h 172.16.1.121 cluster meet 172.16.1.123 6382

# 查看节点信息

[root@dbtest03 ~]# redis-trib.rb info 172.16.1.121:6379

172.16.1.121:6379 (85622647...) -> 341 keys | 5461 slots | 1 slaves.

172.16.1.123:6379 (98f828cc...) -> 327 keys | 5461 slots | 1 slaves.

172.16.1.122:6379 (0f0232ee...) -> 332 keys | 5462 slots | 1 slaves.

172.16.1.123:6381 (ac2a7383...) -> 0 keys | 0 slots | 0 slaves.

[OK] 1000 keys in 4 masters.

0.06 keys per slot on average.

# 或者

[root@dbtest03 ~]#  redis-cli -p 6379 -h 172.16.1.121 cluster nodes

98f828cce3188a3f670dbbd9f77b5723df6cf53b 172.16.1.123:6379 master - 0 1596791728636 3 connected 10923-16383

cd7afafbf822fb17c26e0e45c921dfa94d8526b9 172.16.1.123:6380 slave 85622647ecc43b13ea10083aa59e73399a30b75f 0 1596791730146 5 connected

0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 172.16.1.122:6379 master - 0 1596791730649 2 connected 5461-10922

85622647ecc43b13ea10083aa59e73399a30b75f 172.16.1.121:6379 myself,master - 0 0 1 connected 0-5460

ed5d625d41f5c3621bdd068dbd0c2c30bc4c0649 172.16.1.121:6380 slave 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 0 1596791729138 6 connected

ac2a738356e56952a792fc36c51290675bcc7ed9 172.16.1.123:6381 master - 0 1596791729139 0 connected

92bf59c43755c92953e50dda2c7d806bbb9d5f7b 172.16.1.122:6380 slave 98f828cce3188a3f670dbbd9f77b5723df6cf53b 0 1596791729139 4 connected

重新分配槽位

[root@dbtest03 ~]#  redis-trib.rb reshard 172.16.1.121:6379

# 你想移动多少个槽位到新节点

How many slots do you want to move (from 1 to 16384)? 4096

# 新节点的 ID 是什么

What is the receiving node ID? ac2a738356e56952a792fc36c51290675bcc7ed9

# 输入源节点的ID，如果是所有节点直接使用 all

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

# 你确定要这么分配？

Do you want to proceed with the proposed reshard plan (yes/no)? yes

# 分配完毕，查看分配结果

[root@dbtest03 ~]#  redis-cli -p 6379 -h 172.16.1.121 cluster nodes

98f828cce3188a3f670dbbd9f77b5723df6cf53b 172.16.1.123:6379 master - 0 1596792078142 3 connected 12288-16383

cd7afafbf822fb17c26e0e45c921dfa94d8526b9 172.16.1.123:6380 slave 85622647ecc43b13ea10083aa59e73399a30b75f 0 1596792079652 5 connected

0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 172.16.1.122:6379 master - 0 1596792080155 2 connected 6827-10922

85622647ecc43b13ea10083aa59e73399a30b75f 172.16.1.121:6379 myself,master - 0 0 1 connected 1365-5460

ed5d625d41f5c3621bdd068dbd0c2c30bc4c0649 172.16.1.121:6380 slave 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 0 1596792078645 6 connected

ac2a738356e56952a792fc36c51290675bcc7ed9 172.16.1.123:6381 master - 0 1596792078645 7 connected 0-1364 5461-6826 10923-12287

92bf59c43755c92953e50dda2c7d806bbb9d5f7b 172.16.1.122:6380 slave 98f828cce3188a3f670dbbd9f77b5723df6cf53b 0 1596792079652 4 connected

# 或者

[root@dbtest03 ~]# redis-trib.rb info 172.16.1.121:6379

172.16.1.121:6379 (85622647...) -> 249 keys | 4096 slots | 1 slaves.

172.16.1.123:6379 (98f828cc...) -> 251 keys | 4096 slots | 1 slaves.

172.16.1.122:6379 (0f0232ee...) -> 254 keys | 4096 slots | 1 slaves.

172.16.1.123:6381 (ac2a7383...) -> 246 keys | 4096 slots | 0 slaves.

[OK] 1000 keys in 4 masters.

0.06 keys per slot on average.

添加新节点副本

# 添加新节点的副本

[root@dbtest02 ~]# redis-cli -h 172.16.1.123 -p 6382 cluster replicate ac2a738356e56952a792fc36c51290675bcc7ed9

# 或者

[root@dbtest01 ~]# redis-trib.rb add-node --slave --master-id ac2a738356e56952a792fc36c51290675bcc7ed9 172.16.1.122:6382 172.16.1.121:6379

# 上面的命令中最后的 172.16.1.121:6379 ，可以换成集群中任意一台 Redis 实例节点

# 查看 Redis 集群状态，集群每个节点都有一个从库

[root@dbtest03 ~]# redis-trib.rb info 172.16.1.121:6379

172.16.1.121:6379 (85622647...) -> 249 keys | 4096 slots | 1 slaves.

172.16.1.123:6379 (98f828cc...) -> 251 keys | 4096 slots | 1 slaves.

172.16.1.122:6379 (0f0232ee...) -> 254 keys | 4096 slots | 1 slaves.

172.16.1.123:6381 (ac2a7383...) -> 246 keys | 4096 slots | 1 slaves.

[OK] 1000 keys in 4 masters.

0.06 keys per slot on average.

# 或者

[root@dbtest03 ~]# redis-cli -p 6379 -h 172.16.1.121 cluster nodes

98f828cce3188a3f670dbbd9f77b5723df6cf53b 172.16.1.123:6379 master - 0 1596795522020 3 connected 12288-16383

591fab958ffe8695ea83287b6576cd3ba720b385 172.16.1.123:6382 slave ac2a738356e56952a792fc36c51290675bcc7ed9 0 1596795521515 7 connected

0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 172.16.1.122:6379 master - 0 1596795521515 2 connected 6827-10922

85622647ecc43b13ea10083aa59e73399a30b75f 172.16.1.121:6379 myself,master - 0 0 1 connected 1365-5460

92bf59c43755c92953e50dda2c7d806bbb9d5f7b 172.16.1.122:6380 slave 98f828cce3188a3f670dbbd9f77b5723df6cf53b 0 1596795520508 4 connected

cd7afafbf822fb17c26e0e45c921dfa94d8526b9 172.16.1.123:6380 slave 85622647ecc43b13ea10083aa59e73399a30b75f 0 1596795522523 5 connected

ed5d625d41f5c3621bdd068dbd0c2c30bc4c0649 172.16.1.121:6380 slave 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 0 1596795521011 6 connected

ac2a738356e56952a792fc36c51290675bcc7ed9 172.16.1.123:6381 master - 0 1596795521515 7 connected 0-1364 5461-6826 10923-12287

# 调整主从，尽量保证每一台机器的副本都不于主节点在一台机器

模拟故障（不作不会死）

# 分配槽位的过程中

[root@dbtest01 ~]# redis-trib.rb reshard 172.16.1.121:6379

# 执行 Ctrl+c

# 查看集群状态一些命令看不出来有错

[root@dbtest01 ~]# redis-cli -p 6379 -h 172.16.1.121 cluster info

[root@dbtest01 ~]# redis-cli -p 6379 -h 172.16.1.121 cluster nodes

[root@dbtest01 ~]# redis-trib.rb info 172.16.1.121:6379

# 必须使用工具检查集群

[root@dbtest01 ~]# redis-trib.rb check 172.16.1.121:6379

# 错误一：172.16.1.122:6379 节点正在导出槽位，172.16.1.122:6381 节点正在导入槽位

>>> Check for open slots...

[WARNING] Node 172.16.1.122:6381 has slots in importing state (6885).

[WARNING] Node 172.16.1.122:6379 has slots in migrating state (6885).

[WARNING] The following slots are open: 6885

>>> Check slots coverage...

#错误二：172.16.1.122:6379 节点正在导出槽位

>>> Check for open slots...

[WARNING] Node 172.16.1.122:6379 has slots in migrating state (6975).

[WARNING] The following slots are open: 6975

>>> Check slots coverage...

#错误三：

>>> Check for open slots...

[WARNING] Node 172.16.1.122:6381 has slots in importing state (7093).

[WARNING] The following slots are open: 7093

>>> Check slots coverage...

修复故障（不作不会死）

#使用fix修复集群

[root@dbtest01 ~]# redis-trib.rb fix 172.16.1.122:6379

#将槽位平均分配

1.平均之前

[root@dbtest01 ~]# redis-trib.rb info 172.16.1.121:6379

172.16.1.121:6379 (5ad7bd95...) -> 499 keys | 4096 slots | 1 slaves.

172.16.1.123:6379 (d2755303...) -> 501 keys | 4096 slots | 1 slaves.

172.16.1.122:6381 (a298dbd2...) -> 648 keys | 5320 slots | 1 slaves.

172.16.1.122:6379 (7c79559b...) -> 352 keys | 2872 slots | 1 slaves.

[OK] 2000 keys in 4 masters.

0.12 keys per slot on average.

2.平均分配（如果节点之间槽位数量相差较小，不会平均分配）

[root@dbtest01 ~]# redis-trib.rb rebalance 172.16.1.121:6379

>>> Performing Cluster Check (using node 172.16.1.121:6379)

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

>>> Rebalancing across 4 nodes. Total weight = 4

Moving 1224 slots from 172.16.1.122:6381 to 172.16.1.122:6379

#####################################################################################################

3平均分配之后

[root@dbtest01 ~]# redis-trib.rb info 172.16.1.121:6379

172.16.1.121:6379 (5ad7bd95...) -> 499 keys | 4096 slots | 1 slaves.

172.16.1.123:6379 (d2755303...) -> 501 keys | 4096 slots | 1 slaves.

172.16.1.122:6381 (a298dbd2...) -> 492 keys | 4096 slots | 1 slaves.

172.16.1.122:6379 (7c79559b...) -> 508 keys | 4096 slots | 1 slaves.

[OK] 2000 keys in 4 masters.

0.12 keys per slot on average.

删除节点

重新分配槽位

# 重新分配

[root@dbtest01 ~]#redis-trib.rb reshard 172.16.1.121:6379

...

How many slots do you want to move (from 1 to 16384)? 1365   			# 要分配的槽位数量

What is the receiving node ID? 85622647ecc43b13ea10083aa59e73399a30b75f # 接收槽位的节点 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:ac2a738356e56952a792fc36c51290675bcc7ed9    			    # 要删除的节点 id

Source node #2:done

Do you want to proceed with the proposed reshard plan (yes/no)? yes

...

# 第二次重新分配

[root@dbtest03 ~]# redis-trib.rb reshard 172.16.1.121:6379

>>> Performing Cluster Check (using node 172.16.1.121:6379)

M: 85622647ecc43b13ea10083aa59e73399a30b75f 172.16.1.121:6379

   slots:0-5460 (5461 slots) master

   1 additional replica(s)

M: 98f828cce3188a3f670dbbd9f77b5723df6cf53b 172.16.1.123:6379

   slots:12288-16383 (4096 slots) master

   1 additional replica(s)

S: 591fab958ffe8695ea83287b6576cd3ba720b385 172.16.1.123:6382

   slots: (0 slots) slave

   replicates ac2a738356e56952a792fc36c51290675bcc7ed9

M: 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 172.16.1.122:6379

   slots:6827-10922 (4096 slots) master

   1 additional replica(s)

S: 92bf59c43755c92953e50dda2c7d806bbb9d5f7b 172.16.1.122:6380

   slots: (0 slots) slave

   replicates 98f828cce3188a3f670dbbd9f77b5723df6cf53b

S: cd7afafbf822fb17c26e0e45c921dfa94d8526b9 172.16.1.123:6380

   slots: (0 slots) slave

   replicates 85622647ecc43b13ea10083aa59e73399a30b75f

S: ed5d625d41f5c3621bdd068dbd0c2c30bc4c0649 172.16.1.121:6380

   slots: (0 slots) slave

   replicates 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9

M: ac2a738356e56952a792fc36c51290675bcc7ed9 172.16.1.123:6381

   slots:5461-6826,10923-12287 (2731 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)? 1366

What is the receiving node ID? 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9

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:ac2a738356e56952a792fc36c51290675bcc7ed9

Source node #2:done

Do you want to proceed with the proposed reshard plan (yes/no)? yes

# 第三次重新分配

[root@dbtest03 ~]# redis-trib.rb reshard 172.16.1.121:6379

>>> Performing Cluster Check (using node 172.16.1.121:6379)

M: 85622647ecc43b13ea10083aa59e73399a30b75f 172.16.1.121:6379

   slots:0-5460 (5461 slots) master

   1 additional replica(s)

M: 98f828cce3188a3f670dbbd9f77b5723df6cf53b 172.16.1.123:6379

   slots:12288-16383 (4096 slots) master

   1 additional replica(s)

S: 591fab958ffe8695ea83287b6576cd3ba720b385 172.16.1.123:6382

   slots: (0 slots) slave

   replicates ac2a738356e56952a792fc36c51290675bcc7ed9

M: 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9 172.16.1.122:6379

   slots:5461-6825,6827-10922 (5461 slots) master

   1 additional replica(s)

S: 92bf59c43755c92953e50dda2c7d806bbb9d5f7b 172.16.1.122:6380

   slots: (0 slots) slave

   replicates 98f828cce3188a3f670dbbd9f77b5723df6cf53b

S: cd7afafbf822fb17c26e0e45c921dfa94d8526b9 172.16.1.123:6380

   slots: (0 slots) slave

   replicates 85622647ecc43b13ea10083aa59e73399a30b75f

S: ed5d625d41f5c3621bdd068dbd0c2c30bc4c0649 172.16.1.121:6380

   slots: (0 slots) slave

   replicates 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9

M: ac2a738356e56952a792fc36c51290675bcc7ed9 172.16.1.123:6381

   slots:6826,10923-12287 (1366 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)? 1

What is the receiving node ID? 0f0232ee5ded523a1ccb6c9e281555a1da13c5d9

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:ac2a738356e56952a792fc36c51290675bcc7ed9

Source node #2:done

Do you want to proceed with the proposed reshard plan (yes/no)? yes

查看节点信息

[root@dbtest03 ~]# redis-trib.rb info 172.16.1.121:6379

172.16.1.121:6379 (85622647...) -> 341 keys | 5461 slots | 1 slaves.

172.16.1.123:6379 (98f828cc...) -> 327 keys | 5461 slots | 2 slaves.

172.16.1.122:6379 (0f0232ee...) -> 332 keys | 5462 slots | 1 slaves.

172.16.1.123:6381 (ac2a7383...) -> 0 keys | 0 slots | 0 slaves.

[OK] 1000 keys in 4 masters.

0.06 keys per slot on average.

删除节点（无数据）

# 删除没有数据的主节点

[root@dbtest03 ~]# redis-trib.rb del-node 172.16.1.123:6381 ac2a738356e56952a792fc36c51290675bcc7ed9

>>> Removing node ac2a738356e56952a792fc36c51290675bcc7ed9 from cluster 172.16.1.123:6381

>>> Sending CLUSTER FORGET messages to the cluster...

>>> SHUTDOWN the node.

# 删除从节点

[root@dbtest03 ~]# redis-trib.rb del-node 172.16.1.123:6382 591fab958ffe8695ea83287b6576cd3ba720b385

>>> Removing node 591fab958ffe8695ea83287b6576cd3ba720b385 from cluster 172.16.1.123:6382

>>> Sending CLUSTER FORGET messages to the cluster...

>>> SHUTDOWN the node.

# 删除时不能删除有数据的主节点，从节点可以随便删除

[root@dbtest03 ~]# redis-trib.rb del-node 172.16.1.121:6379 85622647ecc43b13ea10083aa59e73399a30b75f

>>> Removing node 85622647ecc43b13ea10083aa59e73399a30b75f from cluster 172.16.1.121:6379

[ERR] Node 172.16.1.121:6379 is not empty! Reshard data away and try again.
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