【架构】Docker实现集群主从缩容【案例4/4】

一直奔跑在路上2024-01-30 14:38

实现集群主从缩容【4/4】

接上一节，在当前机器为4主4从的架构上，减缩容量为3主3从架构。即实现删除6387和6388.

示意图如下：

第一步：查看集群情况（第一次）

python 复制代码 
redis-cli --cluster check 127.0.0.1:6387
复制代码 
root@localhost:/data# redis-cli --cluster check 127.0.0.1:6387
127.0.0.1:6387 (bf73145e...) -> 1 keys | 4096 slots | 1 slaves.
12.114.161.16:6381 (6e961a47...) -> 1 keys | 4096 slots | 1 slaves.
12.114.161.16:6383 (78ac7be1...) -> 1 keys | 4096 slots | 1 slaves.
12.114.161.16:6382 (f097fec9...) -> 1 keys | 4096 slots | 1 slaves.
[OK] 4 keys in 4 masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 127.0.0.1:6387)
M: bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 127.0.0.1:6387
   slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master
   1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 12.114.161.16:6386
   slots: (0 slots) slave
   replicates 6e961a4765b555189708bebb69badf7dfad25cd5
S: 664e456ae7d5cf27ea6583ba2f437dac11d4e767 12.114.161.16:6388
   slots: (0 slots) slave
   replicates bf73145e2eaaaa08084c9c2dad0d8c757faa48e1
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 12.114.161.16:6385
   slots: (0 slots) slave
   replicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
M: 6e961a4765b555189708bebb69badf7dfad25cd5 12.114.161.16:6381
   slots:[1365-5460] (4096 slots) master
   1 additional replica(s)
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 12.114.161.16:6384
   slots: (0 slots) slave
   replicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 12.114.161.16:6383
   slots:[12288-16383] (4096 slots) master
   1 additional replica(s)
M: f097fec937f54d147d316c1c62e26cb67c9fd059 12.114.161.16:6382
   slots:[6827-10922] (4096 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.

第二步：删除从主机（6388）,删除参数【--cluster del-node】

python 复制代码 
redis-cli --cluster del-node 12.114.161.16:6388 664e456ae7d5cf27ea6583ba2f437dac11d4e767
复制代码 
root@localhost:/data# redis-cli --cluster del-node 12.114.161.16:6388 664e456ae7d5cf27ea6583ba2f437dac11d4e767
>>> Removing node 664e456ae7d5cf27ea6583ba2f437dac11d4e767 from cluster 12.114.161.16:6388
>>> Sending CLUSTER FORGET messages to the cluster...
>>> Sending CLUSTER RESET SOFT to the deleted node.

第三步：查看集群情况（第二次）

python 复制代码 
redis-cli --cluster check 127.0.0.1:6387
复制代码 
略。。。

第四步：将该主机的槽位分给6381主机【--cluster reshard】

python 复制代码 
redis-cli --cluster reshard 12.114.161.16:6381
复制代码 
root@localhost:/data# redis-cli --cluster reshard 12.114.161.16:6381
>>> Performing Cluster Check (using node 12.114.161.16:6381)
M: 6e961a4765b555189708bebb69badf7dfad25cd5 12.114.161.16:6381
   slots:[0-6826],[10923-12287] (8192 slots) master
   1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 12.114.161.16:6386
   slots: (0 slots) slave
   replicates 6e961a4765b555189708bebb69badf7dfad25cd5
M: bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 12.114.161.16:6387
   slots: (0 slots) master
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 12.114.161.16:6385
   slots: (0 slots) slave
   replicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 12.114.161.16:6384
   slots: (0 slots) slave
   replicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: f097fec937f54d147d316c1c62e26cb67c9fd059 12.114.161.16:6382
   slots:[6827-10922] (4096 slots) master
   1 additional replica(s)
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 12.114.161.16:6383
   slots:[12288-16383] (4096 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                  # 移除多少槽位数？
What is the receiving node ID? 6e961a4765b555189708bebb69badf7dfad25cd5     # 分给哪一台master 主机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: bf73145e2eaaaa08084c9c2dad0d8c757faa48e1             # 从哪一台主机移除的槽位 主机ID
Source node #2: done             # 输入done即可 ，后面提示 直接输入'yes'即可
...
....

第五步：查看集群情况（第三次），确定需要移除主机的槽位数为0

python 复制代码 
redis-cli --cluster check 127.0.0.1:6387
复制代码 
root@localhost:/data# redis-cli --cluster check 12.114.161.16:6381  
12.114.161.16:6381 (6e961a47...) -> 2 keys | 8192 slots | 1 slaves.      # 此处显示加上移除来的4096个槽位，总共有8192个槽位。转移成功！
12.114.161.16:6387 (bf73145e...) -> 0 keys | 0 slots | 0 slaves.         # 此次显示原来4096个槽位已经移除，显示为 0
12.114.161.16:6382 (f097fec9...) -> 1 keys | 4096 slots | 1 slaves.
12.114.161.16:6383 (78ac7be1...) -> 1 keys | 4096 slots | 1 slaves.
[OK] 4 keys in 4 masters.                                                  # 显示总共4台master主机
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 12.114.161.16:6381)
M: 6e961a4765b555189708bebb69badf7dfad25cd5 12.114.161.16:6381
   slots:[0-6826],[10923-12287] (8192 slots) master
   1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 12.114.161.16:6386
   slots: (0 slots) slave
   replicates 6e961a4765b555189708bebb69badf7dfad25cd5
M: bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 12.114.161.16:6387
   slots: (0 slots) master                                                 # 此次显示原来Master主机的 4096个槽位已经移除，显示为 0              
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 12.114.161.16:6385
   slots: (0 slots) slave
   replicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 12.114.161.16:6384
   slots: (0 slots) slave
   replicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: f097fec937f54d147d316c1c62e26cb67c9fd059 12.114.161.16:6382
   slots:[6827-10922] (4096 slots) master
   1 additional replica(s)
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 12.114.161.16:6383
   slots:[12288-16383] (4096 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.

根据上面的数据显示，槽位已经转移成功！

【注意：如果想将4096个槽位平均分给另外三台master主机，那么需要重复该操作三次，分别输入不同的目标ID即可！】

第六步：删除master主机（6387）,删除参数【--cluster del-node】

python 复制代码 
redis-cli --cluster del-node 12.114.161.16:6387 bf73145e2eaaaa08084c9c2dad0d8c757faa48e1
复制代码 
root@localhost:/data# redis-cli --cluster del-node 12.114.161.16:6381 bf73145e2eaaaa08084c9c2dad0d8c757faa48e1
>>> Removing node bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 from cluster 12.114.161.16:6381
>>> Sending CLUSTER FORGET messages to the cluster...
>>> Sending CLUSTER RESET SOFT to the deleted node.

第七步：查看最终的集群情况（第四次）

python 复制代码 
redis-cli --cluster check 127.0.0.1:6387
复制代码 
root@localhost:/data# 
root@localhost:/data# 
root@localhost:/data# redis-cli --cluster check 12.114.161.16:6381                                            
12.114.161.16:6381 (6e961a47...) -> 2 keys | 8192 slots | 1 slaves.       # 该列表不在显示6387端口的master主机了
12.114.161.16:6382 (f097fec9...) -> 1 keys | 4096 slots | 1 slaves.
12.114.161.16:6383 (78ac7be1...) -> 1 keys | 4096 slots | 1 slaves.
[OK] 4 keys in 3 masters.                                                   # 此次仅仅剩下3台Master主机
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 12.114.161.16:6381)
M: 6e961a4765b555189708bebb69badf7dfad25cd5 12.114.161.16:6381
   slots:[0-6826],[10923-12287] (8192 slots) master
   1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 12.114.161.16:6386
   slots: (0 slots) slave
   replicates 6e961a4765b555189708bebb69badf7dfad25cd5
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 12.114.161.16:6385
   slots: (0 slots) slave
   replicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 12.114.161.16:6384
   slots: (0 slots) slave
   replicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: f097fec937f54d147d316c1c62e26cb67c9fd059 12.114.161.16:6382
   slots:[6827-10922] (4096 slots) master
   1 additional replica(s)
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 12.114.161.16:6383
   slots:[12288-16383] (4096 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.

至此，成功将原来的"4主4从架构"，缩容成"3主3从架构"！

相关推荐
yuzhiboyouye21 小时前
VO一般java后端怎么转换成前端想要的数据
java·前端·状态模式
殇尘21 小时前
Docker + VSCode 搭建开发环境沙箱
vscode·docker·容器
一 乐21 小时前
学院教学工作量统计|基于java+ vue学院教学工作量统计管理系统(源码+数据库+文档)
java·数据库·vue.js·spring boot·论文·毕设·学院教学工作量统计系统
zandy10111 天前
HENGSHI SENSE加速引擎架构深度解析：MPP列存与ClickHouse物化视图实战
clickhouse·架构·企业级bi·mpp列存
迷藏4941 天前
【无标题】
java·数据库·oracle
河阿里1 天前
Java包装类（Wrapper）：自动装箱拆箱机制与类型转换的那些坑
java·开发语言
小宇的天下1 天前
Virtuoso 技巧---被锁定无法编辑的文件解锁
java
LT10157974441 天前
2026年微服务性能测试平台选型指南：分布式架构适配与服务联动测试
分布式·微服务·架构
若兰幽竹1 天前
【HarmonyOS 6.1 全场景实战】《灵犀厨房》实战之补充【架构进化】灵犀厨房四层分层设计：给鸿蒙 App 搭一副坚不可摧的骨架
架构·鸿蒙系统·harmonyos6.1.0·灵犀厨房
微风欲寻竹影1 天前
Java数据结构——栈（Stack）详解
java·开发语言·数据结构
热门推荐
01GitHub 镜像站点02Codex 接入 DeepSeek API 完整配置文档03【AI】2026 年具身智能模型和世界模型总结04头歌软件工程导论UML画图题(基于starUML)05CC-Switch & Claude 基于 Linux 服务器安装使用指南06Gemini大升级、AI眼镜首发、Android XR亮相，13天后见分晓07人工智能最新动态 AI 日报 · 2026年5月10日08AI科技热点日报 | 2026年5月11日09Codex 手机端连接教程：三分钟搞定，附完整步骤10零基础教你claude code 接入 deepseek V4