Redis集群水平扩展添加节点删除节点

在原集群中增加节点，再增加一主一从，在redis 的redis-cluster下创建8007 8008 目录

cd /opt/redis-5.0.7/redis-cluster
mkdir 8007 8008

复制 8001 的redis 配置文件致 8007与8008

cd 8001
cp redis.conf ../8007/
cp redis.conf ../8008/

修改 8007 和8008 redis.conf 配置文件,通过批量修改命令完成

vim redis.conf	

#命令模式批量替换

:%s/8001/8007
===============
:%s/8001/8008

启动8007 8008 redis服务

cd ../../bin

./redis-server ../redis-cluster/8007/redis.conf

./redis-server ../redis-cluster/8008/redis.conf

添加新节点使用 --cluster add node 命令

./redis-cli -a admin21262 --cluster add node 192.168.217.128:8007 192.168.217.128:8001

查看集群状态

./redis-cli -a admin21262 -c -h 192.168..217.128 -p 8001

为8007 添加加槽位（新加的节点没有hash 槽不能使用）

./redis-cli -a admin21262 --cluster reshard 192.168.217.128:8001

输入新增节点占用的槽位（根据自己集群节点合理设置 redis 集群总槽数量是16384）

How many slots do you want to move (from 1 to 16384)?1000

这些槽点分配给那个节点ID
8007节点ID 可以
通过 cluster nodes

 ./redis-cli -a root -c -h 192.168.217.128 -p 8001
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.217.128:8001> cluster nodes
8159431d3d56956ddc819584ff5526484a3f2705 192.168.217.128:8007@18007 master - 0 1624698771784 7  0 1624698770000 0 connected
160224afce6c868c653d8e26e0cc5bdaf8da17be 192.168.217.130:8003@18003 master - 0 1624698769752 3 connected 11122-16383
0f3e37ec085d26448898129af9388f1a74a2c19e 192.168.217.130:8006@18006 slave 736fe6711ab1c1abfaace923fa553661bf956c37 0 1624698769042 6 connected
02d47d69650337ec4a967f5311718939c65d61ee 192.168.217.128:8001@18001 myself,master - 0 1624698769000 1 connected 199-5460
1e10e6ac6562918ee95480feb7a48e4679c3db62 192.168.217.128:8004@18004 slave 160224afce6c868c653d8e26e0cc5bdaf8da17be 0 1624698772807 4 connected

What is the receiving node ID?8159431d3d56956ddc819584ff5526484a3f2705

在Source node 1:输入 all
Source node 1: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

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

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

完成后再查看集群状态信息

./redis-cli -a root -c -h 192.168.217.128 -p 8001

 cluster nodes

为 8007 添加 slave

./redis-cli -a root --cluster add-node 192.168.217.128:8008 192.168.217.128:8001

查看新增的8008 节点信息

 ./redis-cli -a root -c -h 192.168.217.128 -p 8001
 
cluster nodes

记录8007 节点信息

8159431d3d56956ddc819584ff5526484a3f2705 192.168.217.128:8007@18007 master

将 8008 添加到8007 成为 8007 的slave
链接到 8008 节点设置为8007 的集群复制

./redis-cli -a root -c -h 192.168.217.128 -p 8008

cluster replicate 8159431d3d56956ddc819584ff5526484a3f2705

删除节点
用del-node删除从节点8008

./redis-cli -a admin21262  --cluster del-node 192.168.217.128:8008 0d62b7a164159c5a0a3cf72074a1b14b7c2f43ff

删除8007 主节点，删除前先将8007 主节点的槽中的数据转移到其他主节点中

./redis-cli -a admin21262  --cluster reshard 192.168.217.128

根据提示将8007 的槽移动到其他主节点

How many slots do you want to move (from 1 to 16384)?1000

输入8001 节点ID
What is the receiving node ID?02d47d69650337ec4a967f5311718939c65d61ee

从8007 迁移 输入 8007 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 1:8159431d3d56956ddc819584ff5526484a3f2705

这个提示 输入 node  完成即可

Source node 2:done

这个迁移计划提示 输入yes 
Do you want to proceed with the proposed reshard plan (yes/no)? yes

迁移完成然后再使用用del-node命令删除8007主节点即

./redis-cli -a admin21262  --cluster del-node 192.168.217.128:8007 8159431d3d56956ddc819584ff5526484a3f2705

done…

Redis集群水平扩展添加节点删除节点

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