背景：安装redis-5.0.5，使用redis-cli搭建redis集群，并扩缩分片。
安装redis-5.0.5
1、官网下载redis-5.0.5.tar.gz，并上传到服务器上。
2、我这里将redis-5.0.5.tar.gz上传至/usr/local/src目录下。
[root@localhost src]# ll /usr/local/src/redis-5.0.5.tar.gz
-rw-r--r--. 1 root root 1975750 May 25 00:13 /usr/local/src/redis-5.0.5.tar.gz3、解压redis-5.0.5.tar.gz。
[root@localhost src]# tar -zxf redis-5.0.5.tar.gz4、进入解压后的目录，进行安装。
[root@localhost src]# cd redis-5.0.5/然后输入make && make install 进行编译安装：
[root@localhost redis-5.0.5]# make && make install.................make[1]: Leaving directory `/usr/local/src/redis-5.0.5/src'
[root@localhost redis-5.0.5]#然后将启动文件拷贝至/usr/bin下：
[root@localhost redis-5.0.5]# cp src/redis-server /usr/bin/5、查看redis版本，可以看到redis已经安装成功
[root@localhost ~]# redis-server --version
Redis server v=5.0.5 sha=00000000:0 malloc=jemalloc-5.1.0 bits=64 build=e53c2b8a69fecf7d创建redis实例
redis集群默认至少需要3主3从，所以至少需要6个节点，在生成环境中，分片的主从都不是在一台机器上的，这也是分片的意义，这里是只是简单的搭建，所以只是在一台机器上创建了6个redis实例进行搭建（我这里搭建集群的机器ip地址是：192.168.222.133）。
1、创建6个redis实例，所以需要6个端口，我这里创建了6个目录，用作redis实例的数据和配置文件存放的目录，数据目录最好创建在数据盘。
[root@localhost ~]# mkdir /data/7000
[root@localhost ~]# mkdir /data/7001
[root@localhost ~]# mkdir /data/8000
[root@localhost ~]# mkdir /data/8001
[root@localhost ~]# mkdir /data/9000
[root@localhost ~]# mkdir /data/90012、创建redis实例的配置文件，将该配置文件拷贝到其它5个目录，且文件名、文件内容中的端口替换为对应端口即可。这些配置是简单的配置，需要添加其它参数的话自行添加。
[root@localhost 7000]# cat /data/7000/redis-7000.conf
# 修改为后台启动
daemonize yes
#bind
bind 192.168.222.133
# 修改端口号
port 7000
# 指定数据文件存储位置
dir /data/7000/
# 开启集群模式
cluster-enabled yes
# 集群节点超时间
cluster-node-timeout 15000
# 关闭保护模式
protected-mode no
# 开启aof模式持久化
appendonly yes
# 设置连接Redis需要密码123（选配）
#requirepass 123456
# 设置Redis节点与节点之间访问需要密码123（选配）
#masterauth 1234563、配置文件拷贝、修改完成后，启动6个redis实例。
[root@localhost ~]# redis-server /data/7000/redis-7000.conf
[root@localhost ~]# redis-server /data/7001/redis-7001.conf
[root@localhost ~]# redis-server /data/8000/redis-8000.conf
[root@localhost ~]# redis-server /data/8001/redis-8001.conf
[root@localhost ~]# redis-server /data/9000/redis-9000.conf
[root@localhost ~]# redis-server /data/9001/redis-9001.conf4、查看redis实例启动情况，可以看到6个实例都正常。
[root@localhost ~]# ps aux | grep redis | grep -v grep
root 2887 0.1 0.1 163216 11776 ? Ssl 23:42 0:00 redis-server 192.168.222.133:7000 [cluster]
root 2892 0.2 0.1 154000 7684 ? Ssl 23:42 0:00 redis-server 192.168.222.133:7001 [cluster]
root 2911 0.1 0.1 154000 7684 ? Ssl 23:43 0:00 redis-server 192.168.222.133:8000 [cluster]
root 2920 0.1 0.1 154000 7684 ? Ssl 23:43 0:00 redis-server 192.168.222.133:8001 [cluster]
root 2929 0.1 0.1 154000 7684 ? Ssl 23:43 0:00 redis-server 192.168.222.133:9000 [cluster]
root 2938 0.1 0.1 154000 7684 ? Ssl 23:43 0:00 redis-server 192.168.222.133:9001 [cluster]搭建redis集群
1、利用6个redis实例，搭建3主3从redis集群，使用以下命令搭建redis集群。
搭建集群的命令：redis-cli --cluster create 192.168.222.133:7000 192.168.222.133:8000 192.168.222.133:9000 192.168.222.133:7001 192.168.222.133:8001 192.168.222.133:9001 --cluster-replicas 1#--cluster-replicas 1 表示从库为1个实例
#这里控制不了谁是主谁是从，但是如果有三台机器的话，主从默认不会在一个机器上这是我执行命令后的输出情况，可以看到搭建集群成功，也分配了对应的槽位：
[root@localhost ~]# redis-cli --cluster create 192.168.222.133:7000 192.168.222.133:8000 192.168.222.133:9000 192.168.222.133:7001 192.168.222.133:8001 192.168.222.133:9001 --cluster-replicas 1
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.222.133:8001 to 192.168.222.133:7000
Adding replica 192.168.222.133:9001 to 192.168.222.133:8000
Adding replica 192.168.222.133:7001 to 192.168.222.133:9000
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000slots:[0-5460] (5461 slots) master
M: ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000slots:[5461-10922] (5462 slots) master
M: 7d138927259fd5a6847d27c56af05b6f727e379b 192.168.222.133:9000slots:[10923-16383] (5461 slots) master
S: e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001replicates ad413b85bea8dffa4ed78286a483b0f078e76725
S: d6225c2e8b2e3b19f608c082b2d24a6c87b1c424 192.168.222.133:8001replicates 7d138927259fd5a6847d27c56af05b6f727e379b
S: 0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001replicates 532617682328eee2853ed10f8e7bf5f5f900ab5f
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 192.168.222.133:7000)
M: 532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000slots:[0-5460] (5461 slots) master1 additional replica(s)
S: e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001slots: (0 slots) slavereplicates ad413b85bea8dffa4ed78286a483b0f078e76725
S: d6225c2e8b2e3b19f608c082b2d24a6c87b1c424 192.168.222.133:8001slots: (0 slots) slavereplicates 7d138927259fd5a6847d27c56af05b6f727e379b
S: 0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001slots: (0 slots) slavereplicates 532617682328eee2853ed10f8e7bf5f5f900ab5f
M: 7d138927259fd5a6847d27c56af05b6f727e379b 192.168.222.133:9000slots:[10923-16383] (5461 slots) master1 additional replica(s)
M: ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000slots:[5461-10922] (5462 slots) master1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@localhost ~]#2、随便进入一个节点，使用redis nodes 查看redis集群情况，可以看到3主3从的redis集群搭建成功。
[root@localhost ~]# redis-cli -c -h 192.168.222.133 -p 7000
192.168.222.133:7000> cluster nodes
532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000@17000 myself,master - 0 1719071708000 1 connected 0-5460
e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001@17001 slave ad413b85bea8dffa4ed78286a483b0f078e76725 0 1719071711069 4 connected
d6225c2e8b2e3b19f608c082b2d24a6c87b1c424 192.168.222.133:8001@18001 slave 7d138927259fd5a6847d27c56af05b6f727e379b 0 1719071707964 5 connected
0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001@19001 slave 532617682328eee2853ed10f8e7bf5f5f900ab5f 0 1719071708000 6 connected
7d138927259fd5a6847d27c56af05b6f727e379b 192.168.222.133:9000@19000 master - 0 1719071710000 3 connected 10923-16383
ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000@18000 master - 0 1719071710040 2 connected 5461-10922
192.168.222.133:7000>redis集群缩容分片
1、查看集群情况，目前redis集群是3主3从，并且都已经分配了槽位。
[root@localhost ~]# redis-cli -c -h 192.168.222.133 -p 7000
192.168.222.133:7000> cluster nodes
532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000@17000 myself,master - 0 1719071708000 1 connected 0-5460
e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001@17001 slave ad413b85bea8dffa4ed78286a483b0f078e76725 0 1719071711069 4 connected
d6225c2e8b2e3b19f608c082b2d24a6c87b1c424 192.168.222.133:8001@18001 slave 7d138927259fd5a6847d27c56af05b6f727e379b 0 1719071707964 5 connected
0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001@19001 slave 532617682328eee2853ed10f8e7bf5f5f900ab5f 0 1719071708000 6 connected
7d138927259fd5a6847d27c56af05b6f727e379b 192.168.222.133:9000@19000 master - 0 1719071710000 3 connected 10923-16383
ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000@18000 master - 0 1719071710040 2 connected 5461-10922
192.168.222.133:7000>2、准备缩容掉master：192.168.222.133:9000，slave：192.168.222.133:8001这两个分片。先下掉slave：192.168.222.133:8001
删除从节点的命令：redis-cli --cluster del-node <ip:port> <node-ip>我这里执行的情况：[root@localhost ~]# redis-cli --cluster del-node 192.168.222.133:8001 d6225c2e8b2e3b19f608c082b2d24a6c87b1c424
>>> Removing node d6225c2e8b2e3b19f608c082b2d24a6c87b1c424 from cluster 192.168.222.133:8001
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
[root@localhost ~]#3、slave节点删除成功后，需要下掉master：192.168.222.133:9000，删除master，必须先要将槽位分配走，然后再删除。这里将master： 192.168.222.133:9000的槽位分配给：master： 192.168.222.133:8000
重新分配，输入;
步骤1：redis-cli --cluster reshard <需要删除节点IP:port>
步骤2: 5461 #这里表示需要挪动的槽位数量，9000端口负责了5461个槽位，所以输入5461
步骤2：ad413b85bea8dffa4ed78286a483b0f078e76725 #这里填谁分配出槽位的节点node-id，所以里这是9000的node-id
步骤3：7d138927259fd5a6847d27c56af05b6f727e379b #这里填谁来接受槽位的节点node-id，所以这里是8000的node-id
步骤4：done #输入done，可以理解为开始分配
步骤5：yes #类似确认以下是我分配的情况，输入的步骤：[root@localhost ~]# redis-cli --cluster reshard 192.168.222.133:9000
>>> Performing Cluster Check (using node 192.168.222.133:9000)
M: 7d138927259fd5a6847d27c56af05b6f727e379b 192.168.222.133:9000slots:[10923-16383] (5461 slots) master
S: 0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001slots: (0 slots) slavereplicates 532617682328eee2853ed10f8e7bf5f5f900ab5f
M: ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000slots:[5461-10922] (5462 slots) master1 additional replica(s)
S: e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001slots: (0 slots) slavereplicates ad413b85bea8dffa4ed78286a483b0f078e76725
M: 532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000slots:[0-5460] (5461 slots) master1 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)? 5461
What is the receiving node ID? ad413b85bea8dffa4ed78286a483b0f078e76725
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: 7d138927259fd5a6847d27c56af05b6f727e379b
Source node #2: done4、查看master： 192.168.222.133:9000的槽位确实已经分配给了：master： 192.168.222.133:8000
[root@localhost ~]# redis-cli -c -h 192.168.222.133 -p 7000
192.168.222.133:7000> cluster nodes
532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000@17000 myself,master - 0 1719073472000 1 connected 0-5460
e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001@17001 slave ad413b85bea8dffa4ed78286a483b0f078e76725 0 1719073471990 7 connected
0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001@19001 slave 532617682328eee2853ed10f8e7bf5f5f900ab5f 0 1719073474050 6 connected
7d138927259fd5a6847d27c56af05b6f727e379b 192.168.222.133:9000@19000 master - 0 1719073473018 3 connected
ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000@18000 master - 0 1719073475076 7 connected 5461-16383
192.168.222.133:7000>5、删除master： 192.168.222.133:9000节点。
[root@localhost ~]# redis-cli --cluster del-node 192.168.222.133:9000 7d138927259fd5a6847d27c56af05b6f727e379b
>>> Removing node 7d138927259fd5a6847d27c56af05b6f727e379b from cluster 192.168.222.133:9000
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
[root@localhost ~]#6、查看整个集群的状态，可以看到master：192.168.222.133:9000，slave：192.168.222.133:8001这两个分片已经缩容掉，而且槽位也已经由 192.168.222.133:8000负责。
[root@localhost ~]# redis-cli -c -h 192.168.222.133 -p 7000
192.168.222.133:7000> cluster nodes
532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000@17000 myself,master - 0 1719073654000 1 connected 0-5460
e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001@17001 slave ad413b85bea8dffa4ed78286a483b0f078e76725 0 1719073656652 7 connected
0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001@19001 slave 532617682328eee2853ed10f8e7bf5f5f900ab5f 0 1719073654568 6 connected
ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000@18000 master - 0 1719073655614 7 connected 5461-16383
192.168.222.133:7000>redis集群扩容分片
1、查看集群情况，目前redis集群是2主2从，并且都已经分配了槽位。
[root@localhost ~]# redis-cli -c -h 192.168.222.133 -p 7000
192.168.222.133:7000> cluster nodes
532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000@17000 myself,master - 0 1719073654000 1 connected 0-5460
e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001@17001 slave ad413b85bea8dffa4ed78286a483b0f078e76725 0 1719073656652 7 connected
0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001@19001 slave 532617682328eee2853ed10f8e7bf5f5f900ab5f 0 1719073654568 6 connected
ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000@18000 master - 0 1719073655614 7 connected 5461-16383
192.168.222.133:7000>2、准备两个redis实例为192.168.222.133:9000，192.168.222.133:8001，并将这两个分片到集群中，期望将192.168.222.133:9000设置为master，192.168.222.133:8001设置为slave。先将192.168.222.133:9000加入集群中：
将节点加入集群的命令：redis-cli --cluster add-node <新加入节点的IP:port> <已经在集群中的任意节点IP:port>我这里执行的情况，可以看到加入成功：[root@localhost 8001]# redis-cli --cluster add-node 192.168.222.133:9000 192.168.222.133:7000
>>> Adding node 192.168.222.133:9000 to cluster 192.168.222.133:7000
>>> Performing Cluster Check (using node 192.168.222.133:7000)
M: 532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000slots:[0-5460] (5461 slots) master1 additional replica(s)
S: e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001slots: (0 slots) slavereplicates ad413b85bea8dffa4ed78286a483b0f078e76725
S: 0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001slots: (0 slots) slavereplicates 532617682328eee2853ed10f8e7bf5f5f900ab5f
M: ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000slots:[5461-16383] (10923 slots) master1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 192.168.222.133:9000 to make it join the cluster.
[OK] New node added correctly.3、可以看到192.168.222.133:9000加入了集群，但是没有槽位。
[root@localhost 8001]# redis-cli -c -h 192.168.222.133 -p 7000
192.168.222.133:7000> cluster nodes
532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000@17000 myself,master - 0 1719074087000 1 connected 0-5460
e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001@17001 slave ad413b85bea8dffa4ed78286a483b0f078e76725 0 1719074089116 7 connected
0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001@19001 slave 532617682328eee2853ed10f8e7bf5f5f900ab5f 0 1719074087021 6 connected
3cd072d1e134af85e80858993b498958279e321f 192.168.222.133:9000@19000 master - 0 1719074088000 0 connected
ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000@18000 master - 0 1719074089000 7 connected 5461-16383
192.168.222.133:7000>4、分配槽位给192.168.222.133:9000节点。这里将master:192.168.222.133:8000的5641个端口分配给192.168.222.133:9000
重新分配，输入：
步骤1：redis-cli --cluster reshard <需要新分配槽位的节点IP:port>
步骤2: 5461 #这里表示需要挪动槽位数量，所以输入5461
步骤2：3cd072d1e134af85e80858993b498958279e321f #这里填谁来接受槽位的节点node-id，所以这里是9000的node-id
步骤3：ad413b85bea8dffa4ed78286a483b0f078e76725 #这里填谁分配出槽位的节点node-id，所以里这是8000的node-id
步骤4：done #输入done，可以理解为开始分配
步骤5：yes #类似确认以下是我分配的情况，输入的步骤：[root@localhost 8001]# redis-cli --cluster reshard 192.168.222.133:9000
>>> Performing Cluster Check (using node 192.168.222.133:9000)
M: 3cd072d1e134af85e80858993b498958279e321f 192.168.222.133:9000slots: (0 slots) master
M: ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000slots:[5461-16383] (10923 slots) master1 additional replica(s)
S: e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001slots: (0 slots) slavereplicates ad413b85bea8dffa4ed78286a483b0f078e76725
M: 532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000slots:[0-5460] (5461 slots) master1 additional replica(s)
S: 0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001slots: (0 slots) slavereplicates 532617682328eee2853ed10f8e7bf5f5f900ab5f
[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)? 5641
What is the receiving node ID? 3cd072d1e134af85e80858993b498958279e321f
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: ad413b85bea8dffa4ed78286a483b0f078e76725
Source node #2: done
5、可以看到槽位已经分配成功。
[root@localhost 8001]# redis-cli -c -h 192.168.222.133 -p 7000
192.168.222.133:7000> cluster nodes
532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000@17000 myself,master - 0 1719074539000 1 connected 0-5460
e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001@17001 slave ad413b85bea8dffa4ed78286a483b0f078e76725 0 1719074540000 7 connected
0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001@19001 slave 532617682328eee2853ed10f8e7bf5f5f900ab5f 0 1719074540722 6 connected
3cd072d1e134af85e80858993b498958279e321f 192.168.222.133:9000@19000 master - 0 1719074537000 8 connected 5461-11101
ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000@18000 master - 0 1719074539000 7 connected 11102-163836、给master：192.168.222.133:9000 添加slave：192.168.222.133:8001
给master加slave的命令：redis-cli --cluster add-node <slave节点ip:port> <master节点ip:port> --cluster-slave <master节点的nodes-id> 以下是我执行的情况，执行成功：[root@localhost 8001]# redis-cli --cluster add-node 192.168.222.133:8001 192.168.222.133:9000 --cluster-slave --cluster-master-id 3cd072d1e134af85e80858993b498958279e321f
>>> Adding node 192.168.222.133:8001 to cluster 192.168.222.133:9000
>>> Performing Cluster Check (using node 192.168.222.133:9000)
M: 3cd072d1e134af85e80858993b498958279e321f 192.168.222.133:9000slots:[5461-11101] (5641 slots) master
M: ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000slots:[11102-16383] (5282 slots) master1 additional replica(s)
S: e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001slots: (0 slots) slavereplicates ad413b85bea8dffa4ed78286a483b0f078e76725
M: 532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000slots:[0-5460] (5461 slots) master1 additional replica(s)
S: 0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001slots: (0 slots) slavereplicates 532617682328eee2853ed10f8e7bf5f5f900ab5f
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 192.168.222.133:8001 to make it join the cluster.
Waiting for the cluster to join>>> Configure node as replica of 192.168.222.133:9000.
[OK] New node added correctly.7、可以看到集群扩容成功，且槽位也分配完成。
[root@localhost 8001]# redis-cli -c -h 192.168.222.133 -p 7000
192.168.222.133:7000> cluster nodes
532617682328eee2853ed10f8e7bf5f5f900ab5f 192.168.222.133:7000@17000 myself,master - 0 1719075042000 1 connected 0-5460
f865c91682b0db91298601755150d7fcc8af5e94 192.168.222.133:8001@18001 slave 3cd072d1e134af85e80858993b498958279e321f 0 1719075045399 8 connected
e54654f032713280383077d5d677bf6702affcfc 192.168.222.133:7001@17001 slave ad413b85bea8dffa4ed78286a483b0f078e76725 0 1719075043342 7 connected
0bbb8ba6dd94e0897b26e581d5a9f1bec4157759 192.168.222.133:9001@19001 slave 532617682328eee2853ed10f8e7bf5f5f900ab5f 0 1719075044364 6 connected
3cd072d1e134af85e80858993b498958279e321f 192.168.222.133:9000@19000 master - 0 1719075043000 8 connected 5461-11101
ad413b85bea8dffa4ed78286a483b0f078e76725 192.168.222.133:8000@18000 master - 0 1719075041000 7 connected 11102-16383
192.168.222.133:7000>以上就是redis搭建集群、扩缩容分片。
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