【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
weixin_537765802 分钟前
【容器技术】虚拟化原理与Docker详解
运维·docker·容器
-dcr4 分钟前
41.docker完整版
docker
胡斌附体6 分钟前
docker健康检查使用
运维·docker·依赖·健康检查
r***12388 分钟前
SpringBoot最佳实践之 - 使用AOP记录操作日志
java·spring boot·后端
间彧12 分钟前
Java进程内存深度解析：从JVM组件内存到RSS的全面视角
java
间彧18 分钟前
对比GraalVM Native Image与传统JVM，在内存管理方面各自适合哪些具体业务场景？
java
daidaidaiyu29 分钟前
Spring IOC 源码学习一 基本姿势
java·spring
LSL666_44 分钟前
SpringBoot自动配置类
java·spring boot·后端·自动配置类
u***u6851 小时前
云原生架构2025年趋势：Serverless与边缘计算
云原生·架构·serverless
火车头-1101 小时前
【docker 部署nacos1.4.7】
运维·docker·容器
热门推荐
01GitHub 镜像站点02【保姆级教程】免费使用Gemini3的5种方法！免翻墙/国内直连03BongoCat - 跨平台键盘猫动画工具04UV安装并设置国内源05Google Antigravity：无法登录？早期错误、登录修复和用户反馈指南06安娜的档案(Anna’s Archive) 镜像网站/国内最新可访问入口（持续更新）07Linux下V2Ray安装配置指南08Spring Boot 4.0 发布总结：新特性、依赖变更与升级指南09全球最强模型Grok4，国内已可免费使用！（附教程）10Labelme从安装到标注：零基础完整指南