Redis Cluster集群（二）

3.给新添加的主节点添加对用的从节点：
 [root@redis-cluster4 src]# ./redis-cli --cluster add-node 192.168.116.175:7007 192.168.116.175:7006 --cluster-slave --cluster-master-id 308320db4284c9b203aff1d3d9a145616856f681 #master的id
 >>> Adding node 192.168.116.175:7007 to cluster 192.168.116.175:7006
 >>> Performing Cluster Check (using node 192.168.116.175:7006)
 ......
 [OK] All nodes agree about slots configuration.
 >>> Check for open slots...
 >>> Check slots coverage...
 [OK] All 16384 slots covered.
 >>> Send CLUSTER MEET to node 192.168.116.175:7007 to make it join the cluster.
 Waiting for the cluster to join
 ​
 >>> Configure node as replica of 192.168.116.175:7006.
 [OK] New node added correctly.
 ​
 查看集群信息
 192.168.116.172:7000> CLUSTER nodes

 测试链接redis，存取数据(链接集群中任意一台机器就可以。)
 存：
 [root@redis-cluster1 src]# ./redis-cli -h 192.168.116.172 -c -p 7000
 192.168.116.172:7000> ping
 PONG
 192.168.116.172:7000> set name qianfeng
 -> Redirected to slot [5798] located at 192.168.116.173:7002
 OK
 192.168.116.173:7002>
 ​
 读
 [root@redis-cluster3 src]# ./redis-cli -h 192.168.116.173 -c -p 7002
 192.168.116.173:7002> ping 
 PONG
 192.168.116.173:7002> get name
 "qianfeng"
 192.168.116.173:7002> exists name  #查看某一个key是否存在
 (integer) 1

 准备工作:
 1.新准备一台机器，修改主机名，关闭防火墙和selinux。
 2.安装相同版本redis，单机多实例。配置主从端口配置文件。
 新准备cluster4，第一列为master第二列为slave。 
 192.168.116.175 redis-cluster4  7006 7007
 [root@redis-cluster4 ~]# mkdir /data
 [root@redis-cluster4 ~]# yum -y install gcc automake autoconf libtool make
 [root@redis-cluster4 ~]# wget https://download.redis.io/releases/redis-6.2.0.tar.gz
 [root@redis-cluster4 ~]# tar xzvf redis-6.2.0.tar.gz -C /data/
 [root@redis-cluster4 ~]# cd /data/
 [root@redis-cluster4 data]# mv redis-6.2.0/ redis
 [root@redis-cluster4 data]# cd redis/
 [root@redis-cluster4 redis]# make    #编译
 [root@redis-cluster4 redis]# mkdir data  #创建数据目录
 [root@redis-cluster4 redis]# mkdir cluster
 [root@redis-cluster4 redis]# mkdir cluster/{7006,7007}  #创建集群节点
 [root@redis-cluster4 redis]# cp redis.conf cluster/7006/
 [root@redis-cluster4 redis]# cp redis.conf cluster/7007/
 开始修改配置文件略...和之前一样，注意修改不一样的地方:端口、ip、pid文件...
 启动
 [root@redis-cluster4 src]# ./redis-server ../cluster/7006/redis.conf 
 [root@redis-cluster4 src]# ./redis-server ../cluster/7007/redis.conf
 ​
 1.都准备好之后，开始添加节点：将cluster4添加到集群中
 [root@redis-cluster4 src]# ./redis-cli --cluster add-node 192.168.116.175:7006 192.168.116.172:7000
 >>> Adding node 192.168.116.175:7006 to cluster 192.168.116.172:7000
 ......
 >>> Check for open slots...
 >>> Check slots coverage...
 [OK] All 16384 slots covered.
 >>> Send CLUSTER MEET to node 192.168.116.175:7006 to make it join the cluster.
 [OK] New node added correctly.
 ​
 查看集群节点信息(随便登陆一个客户端即可)
 [root@redis-cluster1 src]# ./redis-cli -h 192.168.116.172 -c -p 7000
 192.168.116.172:7000> CLUSTER nodes
 

 详细解释：
 runid: 该行描述的节点的id。
 ip:prot: 该行描述的节点的ip和port
 flags: 逗号分隔的标记位，可能的值有：
 1.master: 该行描述的节点是master
 2.slave: 该行描述的节点是slave
 3.fail?:该行描述的节点可能不可用
 4.fail:该行描述的节点不可用（故障）
 master_runid: 该行描述的节点的master的id,如果本身是master则显示-
 ping-sent: 最近一次发送ping的Unix时间戳，0表示未发送过
 pong-recv：最近一次收到pong的Unix时间戳，0表示未收到过
 config-epoch: 主从切换的次数
 link-state: 连接状态，connnected 和 disconnected
 hash slot: 该行描述的master中存储的key的hash的范围
 2.给新节点hash槽分配
 需要给新节点进行hash槽分配，这样该主节才可以存储数据，（如果有数据记得提前先将数据同步然后在从其他节点迁移槽到新节点。）
 [root@redis-cluster1 src]# ./redis-cli --cluster reshard 192.168.116.175:7006
 >>> Performing Cluster Check (using node 192.168.116.175:7006)
 ......
 [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)? 4000 #输入要分配的槽数量 
 What is the receiving node ID?  828c48dc72d52ff5be972512d3d87b70236af87c #输入接收槽的节点id,通过cluster nodes 查看新增的192.168.116.175:7006 的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.
 输入： all
 然后输入输入yes确认
 ​
 此时再通过cluster nodes查看节点，可以看到新节点分配的槽为0-1332 5461-6794 10923-12255
 [root@redis-cluster1 src]# ./redis-cli -h 192.168.116.172 -c -p 7000
 192.168.116.172:7000> CLUSTER nodes