redis cluster startup

1. Add configuration file

A total of 8 files

1. Create 6 redisXXX.conf files.
   The content of the 6 files is the same as the following, but the port value needs to be modified. For example: change all the following 6379 to 6380

   # 路径为redis.conf的绝对路径
   include /redis集群/redis.conf
   pidfile "/var/run/redis_6379.pid"
   # 端口
   port 6379
   # 持久化文件名字
   dbfilename "dump6379.rdb"
   cluster-enabled yes # 打开集群模式
   cluster-config-file nodes-6379.conf #设定节点配置文件
   cluster-node-timeout 15000 # 设定节点失联时间，超过该时间（毫秒），集群自动进行主从切换
   

2. redis.conf file
   The redis.conf file is copied from the redis installation directory, and appendonlythe parameters are changed to no
   more than 600 lines. You can use /appendonly or ?appendonly to find the content
   
3. sentinel.conf file
   Create a sentinel.conf file and add the following

   # 以6379为主节点
   sentinel monitor mymaster 127.0.0.1 6379 1
   

2. Start the service and cluster

1. Start 6 with redis-server redisXXX.conf command 服务
   
   will generate nodes configuration file
   

2. Combine 6 nodes into a cluster
   and go to the src folder under the redis installation path

   #执行
   redis-cli --cluster create --cluster-replicas 1 192.168.121.133:6379 192.168.121.133:6380 192.168.121.133:6381 192.168.121.133:6389 192.168.121.133:6390 192.168.121.133:6391 命令启动集群
   

   
   Enter yes to determine the master-slave assignment
   

   The cluster started successfully
   

3. connect redis

   连接集群
   	redis-cli -p -c 6379
   查看节点
   	cluster nodes
   

3. Cluster operation

Data will be allocated by slot

set k1 k1

View the slot value of the key in the cluster

cluster keyslot key

Check how many keys are in the slot

cluster getkeysinslot  插槽值

View the first key of the slot

cluster getkeysinslot  插槽值  第几个

4. Fault recovery

1. hang up a host
2. Restart will become slave

A section of master-slave is down, the cluster is unavailable
cluster-require-full-coverage yes
A section of master-slave is down, the cluster is available, but this section of slot is unavailable
cluster-require-full-coverage no