Redis实战案例：基于Redis 5 的 Redis cluster

实战案例：基于Redis 5 的 redis cluster 部署

官方文档：https://redis.io/topics/cluster-tutorial

redis cluster 相关命令

[root@redis-node1 ~]# redis-cli --cluster help Cluster Manager Commands: create host1:port1 ... hostN:portN --cluster-replicas <arg> check host:port --cluster-search-multiple-owners info host:port fix host:port --cluster-search-multiple-owners reshard host:port --cluster-from <arg> --cluster-to <arg> --cluster-slots <arg> --cluster-yes --cluster-timeout <arg> --cluster-pipeline <arg> --cluster-replace rebalance host:port --cluster-weight <node1=w1...nodeN=wN> --cluster-use-empty-masters --cluster-timeout <arg> --cluster-simulate --cluster-pipeline <arg> --cluster-threshold <arg> --cluster-replace add-node new_host:new_port existing_host:existing_port --cluster-slave --cluster-master-id <arg> del-node host:port node_id call host:port command arg arg .. arg set-timeout host:port milliseconds import host:port --cluster-from <arg> --cluster-copy --cluster-replace help For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.

[root@redis-node1 ~]#redis-cli -a 123456 CLUSTER HELP Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 1) CLUSTER <subcommand> arg arg ... arg. Subcommands are: 2) ADDSLOTS <slot> [slot ...] -- Assign slots to current node. 3) BUMPEPOCH -- Advance the cluster config epoch. 4) COUNT-failure-reports <node-id> -- Return number of failure reports for <node-id>. 5) COUNTKEYSINSLOT <slot> - Return the number of keys in <slot>. 6) DELSLOTS <slot> [slot ...] -- Delete slots information from current node. 7) FAILOVER [force|takeover] -- Promote current replica node to being a master. 8) FORGET <node-id> -- Remove a node from the cluster. 9) GETKEYSINSLOT <slot> <count> -- Return key names stored by current node in a slot. 10) FLUSHSLOTS -- Delete current node own slots information. 11) INFO - Return onformation about the cluster. 12) KEYSLOT <key> -- Return the hash slot for <key>. 13) MEET <ip> <port> [bus-port] -- Connect nodes into a working cluster. 14) MYID -- Return the node id. 15) NODES -- Return cluster configuration seen by node. Output format: 16) <id> <ip:port> <flags> <master> <pings> <pongs> <epoch> <link> <slot> ... <slot> 17) REPLICATE <node-id> -- Configure current node as replica to <node-id>. 18) RESET [hard|soft] -- Reset current node (default: soft). 19) SET-config-epoch <epoch> - Set config epoch of current node. 20) SETSLOT <slot> (importing|migrating|stable|node <node-id>) -- Set slot state. 21) REPLICAS <node-id> -- Return <node-id> replicas. 22) SLOTS -- Return information about slots range mappings. Each range is made of: 23) start, end, master and replicas IP addresses, ports and ids

创建redis cluster集群的环境准备

1.每个redis 节点采用相同的硬件配置、相同的密码、相同的redis版本

2.所有redis服务器必须没有任何数据

3.先启动为单机redis且没有任何key value

4.准备六台主机，地址如下：

10.0.0.8 10.0.0.18 10.0.0.28 10.0.0.38 10.0.0.48 10.0.0.58 10.0.0.68

启用redis cluster 配置

所有6台主机都执行以下配置

[root@centos8 ~]#dnf -y install redis

-每个节点修改redis配置，必须开启cluster功能的参数

#手动修改配置文件 [root@redis-node1 ~]vim /etc/redis.conf masterauth 123456 #建议配置，否则后期的master和slave无法成功，还需再配置 requirepass 123456 cluster-enabled yes #必须开启集群状态，开启后redis 进程会有cluster显示 cluster-config-file nodes-6379.conf #此文件有redis cluster集群自动创建和维护 appendonly yes #或者执行下面命令,批量修改 [root@redis-node1 ~]#sed -i.bak -e 's/bind 127.0.0.1/bind 0.0.0.0/' -e '/masterauth/a masterauth 123456' -e '/# requirepass/a requirepass 123456' -e '/# cluster-enabled yes/a cluster-enabled yes' -e '/# cluster-config-file nodes-6379.conf/a cluster-config-file nodes-6379.conf' -e '/appendonly no/c appendonly yes' /etc/redis.conf [root@redis-node1 ~]#systemctl restart redis

-验证当前Redis服务状态：

#开启了16379的cluster的端口 [root@centos8 ~]#ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 100 127.0.0.1:25 0.0.0.0:* LISTEN 0 128 0.0.0.0:16379 0.0.0.0:* LISTEN 0 128 0.0.0.0:6379 0.0.0.0:* LISTEN 0 128 [::]:22 [::]:* LISTEN 0 100 [::1]:25 [::]:* #注意进程的状态 [root@centos8 ~]#ps -ef|grep redis redis 1939 1 0 10:54 ? 00:00:00 /usr/bin/redis-server 0.0.0.0:6379 [cluster] root 1955 1335 0 10:57 pts/0 00:00:00 grep --color=auto redis

创建集群

# --cluster-replicas 1 表示每个master对应一个slave节点 [root@redis-node1 ~]#redis-cli -a 123456 --cluster create 10.0.0.8:6379 10.0.0.18:6379 10.0.0.28:6379 10.0.0.38:6379 10.0.0.48:6379 10.0.0.58:6379 --cluster-replicas 1 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. >>> Performing hash slots allocation on 6 nodes... Master[0] -> Slots 0 - 5460 Master[1] -> Slots 5461 - 10922 Master[2] -> Slots 10923 - 16383 Adding replica 10.0.0.38:6379 to 10.0.0.8:6379 Adding replica 10.0.0.48:6379 to 10.0.0.18:6379 Adding replica 10.0.0.58:6379 to 10.0.0.28:6379 M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379 #带M的为master slots:[0-5460] (5461 slots) master #当前master的槽位起始和结束位 M: 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379 slots:[5461-10922] (5462 slots) master M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379 slots:[10923-16383] (5461 slots) master S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379 #带S的slave replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7 S: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379 replicates 99720241248ff0e4c6fa65c2385e92468b3b5993 S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379 replicates d34da8666a6f587283a1c2fca5d13691407f9462 Can I set the above configuration? (type 'yes' to accept): yes #输入yes自动创建集群 >>> 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 10.0.0.8:6379) M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379 slots:[0-5460] (5461 slots) master #已经分配的槽位 1 additional replica(s) #分配了一个slave S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379 slots: (0 slots) slave #slave没有分配槽位 replicates d34da8666a6f587283a1c2fca5d13691407f9462 #对应的master的10.0.0.28的ID S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379 slots: (0 slots) slave replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7 #对应的master的10.0.0.8的ID S: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379 slots: (0 slots) slave replicates 99720241248ff0e4c6fa65c2385e92468b3b5993 #对应的master的10.0.0.18的ID M: 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) [OK] All nodes agree about slots configuration. #所有节点槽位分配完成 >>> Check for open slots... #检查打开的槽位 >>> Check slots coverage... #检查插槽覆盖范围 [OK] All 16384 slots covered. #所有槽位(16384个)分配完成 [root@redis-node1 ~]# 观察以上结果，可以看到3组master/slave master:10.0.0.8---slave:10.0.0.38 master:10.0.0.18---slave:10.0.0.48 master:10.0.0.28---slave:10.0.0.58

查看主从状态

[root@redis-node1 ~]#redis-cli -a 123456 INFO replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:master connected_slaves:1 slave0:ip=10.0.0.38,port=6379,state=online,offset=896,lag=1 master_replid:3a388865080d779180ff240cb75766e7e57877da master_replid2:0000000000000000000000000000000000000000 master_repl_offset:896 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:896 [root@redis-node2 ~]#redis-cli -a 123456 INFO replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:master connected_slaves:1 slave0:ip=10.0.0.48,port=6379,state=online,offset=980,lag=1 master_replid:b9066d3cbf0c5fecc7f4d1d5cb2433999783fa3f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:980 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:980 [root@redis-node3 ~]#redis-cli -a 123456 INFO replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:master connected_slaves:1 slave0:ip=10.0.0.58,port=6379,state=online,offset=980,lag=0 master_replid:53208e0ed9305d721e2fb4b3180f75c689217902 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:980 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:980 [root@redis-node4 ~]#redis-cli -a 123456 INFO replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:slave master_host:10.0.0.8 master_port:6379 master_link_status:up master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_repl_offset:1036 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:3a388865080d779180ff240cb75766e7e57877da master_replid2:0000000000000000000000000000000000000000 master_repl_offset:1036 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:1036 [root@redis-node5 ~]#redis-cli -a 123456 INFO replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:slave master_host:10.0.0.18 master_port:6379 master_link_status:up master_last_io_seconds_ago:2 master_sync_in_progress:0 slave_repl_offset:1064 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:b9066d3cbf0c5fecc7f4d1d5cb2433999783fa3f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:1064 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:1064 [root@redis-node6 ~]#redis-cli -a 123456 INFO replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:slave master_host:10.0.0.28 master_port:6379 master_link_status:up master_last_io_seconds_ago:7 master_sync_in_progress:0 slave_repl_offset:1078 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:53208e0ed9305d721e2fb4b3180f75c689217902 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:1078 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:1078

验证集群状态

[root@redis-node1 ~]#redis-cli -a 123456 CLUSTER INFO Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:6 #节点数 cluster_size:3 #三个集群 cluster_current_epoch:6 cluster_my_epoch:1 cluster_stats_messages_ping_sent:837 cluster_stats_messages_pong_sent:811 cluster_stats_messages_sent:1648 cluster_stats_messages_ping_received:806 cluster_stats_messages_pong_received:837 cluster_stats_messages_meet_received:5 cluster_stats_messages_received:1648 #查看任意节点的集群状态 [root@redis-node1 ~]#redis-cli -a 123456 --cluster info 10.0.0.38:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 10.0.0.18:6379 (99720241...) -> 0 keys | 5462 slots | 1 slaves. 10.0.0.28:6379 (d34da866...) -> 0 keys | 5461 slots | 1 slaves. 10.0.0.8:6379 (cb028b83...) -> 0 keys | 5461 slots | 1 slaves. [OK] 0 keys in 3 masters. 0.00 keys per slot on average.

查看集群node对应关系

[root@redis-node1 ~]#redis-cli -a 123456 CLUSTER NODES Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379@16379 slave d34da8666a6f587283a1c2fca5d13691407f9462 0 1582344815790 6 connected f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379@16379 slave cb028b83f9dc463d732f6e76ca6bbcd469d948a7 0 1582344811000 4 connected d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379@16379 slave 99720241248ff0e4c6fa65c2385e92468b3b5993 0 1582344815000 5 connected 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379@16379 master - 0 1582344813000 2 connected 5461-10922 d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379@16379 master - 0 1582344814780 3 connected 10923-16383 cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379@16379 myself,master - 0 1582344813000 1 connected 0-5460 [root@redis-node1 ~]#redis-cli -a 123456 --cluster check 10.0.0.38:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 10.0.0.18:6379 (99720241...) -> 0 keys | 5462 slots | 1 slaves. 10.0.0.28:6379 (d34da866...) -> 0 keys | 5461 slots | 1 slaves. 10.0.0.8:6379 (cb028b83...) -> 0 keys | 5461 slots | 1 slaves. [OK] 0 keys in 3 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 10.0.0.38:6379) S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379 slots: (0 slots) slave replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7 S: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379 slots: (0 slots) slave replicates 99720241248ff0e4c6fa65c2385e92468b3b5993 M: 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379 slots: (0 slots) slave replicates d34da8666a6f587283a1c2fca5d13691407f9462 M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379 slots:[0-5460] (5461 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.

验证集群写入key

#经过算法计算，当前key的槽位需要写入指定的node [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.8 SET key1 values1 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. (error) MOVED 9189 10.0.0.18:6379 #槽位不在当前node所以无法写入 [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 SET key1 values1 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. OK #指定node可写入 [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key1 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. "values1" #对应的slave节点可以KEYS *,但GET key1失败 [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.48 KEYS "*" Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 1) "key1" [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.48 GET key1 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. (error) MOVED 9189 10.0.0.18:6379

python脚本实现RedisCluster集群写入

[root@redis-node1 ~]#dnf -y install python3 [root@redis-node1 ~]#pip3 install redis-py-cluster [root@redis-node1 ~]#vim redis_cluster_test.py [root@redis-node1 ~]#cat ./redis_cluster_test.py #!/usr/bin/env python3 from rediscluster import RedisCluster startup_nodes = [ {"host":"10.0.0.8", "port":6379}, {"host":"10.0.0.18", "port":6379}, {"host":"10.0.0.28", "port":6379}, {"host":"10.0.0.38", "port":6379}, {"host":"10.0.0.48", "port":6379}, {"host":"10.0.0.58", "port":6379} ] redis_conn= RedisCluster(startup_nodes=startup_nodes,password='123456', decode_responses=True) for i in range(0, 10000): redis_conn.set('key'+str(i),'value'+str(i)) print('key'+str(i)+':',redis_conn.get('key'+str(i))) [root@redis-node1 ~]#chmod +x redis_cluster_test.py [root@redis-node1 ~]#./redis_cluster_test.py ...... key9998: value9998 key9999: value9999 [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.8 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 10.0.0.8:6379> DBSIZE (integer) 3331 10.0.0.8:6379> GET key1 (error) MOVED 9189 10.0.0.18:6379 10.0.0.8:6379> GET key2 "value2" 10.0.0.8:6379> GET key3 "value3" 10.0.0.8:6379> KEYS * ...... 3329) "key7832" 3330) "key2325" 3331) "key2880" 10.0.0.8:6379> [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 DBSIZE Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. (integer) 3340 [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key1 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. "value1" [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.28 DBSIZE Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. (integer) 3329 [root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key5 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. "value5" [root@redis-node1 ~]#

模拟master故障，对应的slave节点自动提升为新master

#模拟node2节点出故障,需要相应的数秒故障转移时间 [root@redis-node2 ~]#tail -f /var/log/redis/redis.log [root@redis-node2 ~]#redis-cli -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> shutdown not connected> exit [root@redis-node2 ~]#ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 100 127.0.0.1:25 0.0.0.0:* LISTEN 0 128 [::]:22 [::]:* LISTEN 0 100 [::1]:25 [::]:* [root@redis-node2 ~]# redis-cli -a 123456 --cluster info 10.0.0.8:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. Could not connect to Redis at 10.0.0.18:6379: Connection refused 10.0.0.8:6379 (cb028b83...) -> 3331 keys | 5461 slots | 1 slaves. 10.0.0.48:6379 (d04e524d...) -> 3340 keys | 5462 slots | 0 slaves. #10.0.0.48为新的master 10.0.0.28:6379 (d34da866...) -> 3329 keys | 5461 slots | 1 slaves. [OK] 10000 keys in 3 masters. 0.61 keys per slot on average. [root@redis-node2 ~]# redis-cli -a 123456 --cluster check 10.0.0.8:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. Could not connect to Redis at 10.0.0.18:6379: Connection refused 10.0.0.8:6379 (cb028b83...) -> 3331 keys | 5461 slots | 1 slaves. 10.0.0.48:6379 (d04e524d...) -> 3340 keys | 5462 slots | 0 slaves. 10.0.0.28:6379 (d34da866...) -> 3329 keys | 5461 slots | 1 slaves. [OK] 10000 keys in 3 masters. 0.61 keys per slot on average. >>> Performing Cluster Check (using node 10.0.0.8:6379) M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s) S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379 slots: (0 slots) slave replicates d34da8666a6f587283a1c2fca5d13691407f9462 S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379 slots: (0 slots) slave replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7 M: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379 slots:[5461-10922] (5462 slots) master M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379 slots:[10923-16383] (5461 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. [root@redis-node2 ~]#redis-cli -a 123456 -h 10.0.0.48 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 10.0.0.48:6379> INFO replication # Replication role:master connected_slaves:0 master_replid:0000698bc2c6452d8bfba68246350662ae41d8fd master_replid2:b9066d3cbf0c5fecc7f4d1d5cb2433999783fa3f master_repl_offset:2912424 second_repl_offset:2912425 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1863849 repl_backlog_histlen:1048576 10.0.0.48:6379> #恢复故障节点node2 [root@redis-node2 ~]#systemctl start redis #查看自动生成的配置文件，可以查看node2自动成为slave节点 [root@redis-node2 ~]#cat /var/lib/redis/nodes-6379.conf 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379@16379 myself,slave d04e524daec4d8e22bdada7f21a9487c2d3e1057 0 1582352081847 2 connected f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379@16379 slave cb028b83f9dc463d732f6e76ca6bbcd469d948a7 1582352081868 1582352081847 4 connected cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379@16379 master - 1582352081868 1582352081847 1 connected 0-5460 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379@16379 slave d34da8666a6f587283a1c2fca5d13691407f9462 1582352081869 1582352081847 3 connected d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379@16379 master - 1582352081869 1582352081847 7 connected 5461-10922 d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379@16379 master - 1582352081869 1582352081847 3 connected 10923-16383 vars currentEpoch 7 lastVoteEpoch 0 [root@redis-node2 ~]#redis-cli -a 123456 -h 10.0.0.48 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 10.0.0.48:6379> INFO replication # Replication role:master connected_slaves:1 slave0:ip=10.0.0.18,port=6379,state=online,offset=2912564,lag=1 master_replid:0000698bc2c6452d8bfba68246350662ae41d8fd master_replid2:b9066d3cbf0c5fecc7f4d1d5cb2433999783fa3f master_repl_offset:2912564 second_repl_offset:2912425 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1863989 repl_backlog_histlen:1048576 10.0.0.48:6379>