上一篇部落格主要聊了下redis.trib.rb這個工具來管理redis3/4 cluster 中的節點，回顧請參考https://www.cnblogs.com/qiuhom-1874/p/13456915.html；今天我們主要來說一下redis5上cluster相關配置命令說明；
建立叢集
[root@node1 redis]# redis-cli -a admin --cluster create 192.168.0.41:6379 192.168.0.42:6379 192.168.0.43:6379 192.168.0.41:6380 192.168.0.42:6380 192.168.0.43:6380 --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 192.168.0.42:6380 to 192.168.0.41:6379 Adding replica 192.168.0.43:6380 to 192.168.0.42:6379 Adding replica 192.168.0.41:6380 to 192.168.0.43:6379 M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[0-5460] (5461 slots) master M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[5461-10922] (5462 slots) master M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[10923-16383] (5461 slots) master S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 replicates 506776f910a52e45987785199e4fd293956ac1c5 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 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots: (0 slots) slave replicates 506776f910a52e45987785199e4fd293956ac1c5 M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 redis]#
提示：-a表示指定連線叢集的密碼，--cluster create 表示建立叢集，後面跟要加入叢集的各節點ip地址和埠（包括master和slave）；--cluster replicas 用來指定叢集master對應的副本（slave）數量；它會根據我們指定的數量，去建立master和slave，並把16384個槽位平均分配給對應的master節點，並且會自動關聯master和slave的關係；
檢視叢集資訊
[root@node1 redis]# cd [root@node1 ~]# redis-cli --cluster info 192.168.0.41:6379 [ERR] Node 192.168.0.41:6379 NOAUTH Authentication required. [root@node1 ~]# redis-cli -a admin --cluster info 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 0 keys | 5461 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 5461 slots | 1 slaves. 192.168.0.42:6379 (506776f9...) -> 0 keys | 5462 slots | 1 slaves. [OK] 0 keys in 3 masters. 0.00 keys per slot on average. [root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 0 keys | 5461 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 5461 slots | 1 slaves. 192.168.0.42:6379 (506776f9...) -> 0 keys | 5462 slots | 1 slaves. [OK] 0 keys in 3 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots: (0 slots) slave replicates 506776f910a52e45987785199e4fd293956ac1c5 M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 ~]#
檢視叢集 node 對應關係
[root@node1 ~]# redis-cli -a admin -c cluster nodes Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379@16379 master - 0 1592495162494 3 connected 10923-16383 eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380@16380 slave 91e34830f16e45110e37618540628587d5ecc7e2 0 1592495164579 5 connected 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379@16379 myself,master - 0 1592495158000 1 connected 0-5460 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380@16380 slave 506776f910a52e45987785199e4fd293956ac1c5 0 1592495159344 6 connected 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379@16379 master - 0 1592495163529 2 connected 5461-10922 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380@16380 slave 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 0 1592495161445 4 connected [root@node1 ~]#
檢視叢集狀態
[root@node1 ~]# redis-cli -a admin -c 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 cluster_size:3 cluster_current_epoch:6 cluster_my_epoch:1 cluster_stats_messages_ping_sent:159 cluster_stats_messages_pong_sent:158 cluster_stats_messages_sent:317 cluster_stats_messages_ping_received:153 cluster_stats_messages_pong_received:159 cluster_stats_messages_meet_received:5 cluster_stats_messages_received:317 [root@node1 ~]#
提示：其實以上命令就是使用非互動式命令和redis互動，有點類似mysql中的-e選項，連線到對應redisserver上執行命令後返回，在mysql中用-e指定要執行的命令，在redis中用-c指定要執行的命令；
新增一個新節點到現有叢集
實驗環境說明
環境目錄結構
[root@node03 redis]# tree . ├── 6379 │ └── etc │ └── redis.conf ├── 6380 │ └── etc │ └── redis.conf ├── 6381 │ └── etc │ └── redis.conf ├── 6382 │ └── etc │ └── redis.conf ├── bin │ ├── redis-benchmark │ ├── redis-check-aof │ ├── redis-check-rdb │ ├── redis-cli │ ├── redis-sentinel -> redis-server │ └── redis-server ├── dump_6379.rdb ├── dump_6380.rdb ├── logs │ ├── redis_6379.log │ └── redis_6380.log ├── redis-cluster-6379.conf ├── redis-cluster-6380.conf └── run 11 directories, 16 files [root@node03 redis]#
確認配置檔案資訊
提示：需要注意bind的地址必須能夠和叢集其他節點通訊，埠不能和本機其他埠衝突，密碼要和叢集中的節點其他密碼相同；
啟動192.168.0.43：6081/6082
把192.168.0.43：6381/6382新增到現有叢集
[root@node1 ~]# redis-cli -a admin --cluster add-node 192.168.0.43:6381 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. >>> Adding node 192.168.0.43:6381 to cluster 192.168.0.41:6379 >>> Performing Cluster Check (using node 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots: (0 slots) slave replicates 506776f910a52e45987785199e4fd293956ac1c5 M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Send CLUSTER MEET to node 192.168.0.43:6381 to make it join the cluster. [OK] New node added correctly. [root@node1 ~]# redis-cli -a admin --cluster add-node 192.168.0.43:6382 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. >>> Adding node 192.168.0.43:6382 to cluster 192.168.0.41:6379 >>> Performing Cluster Check (using node 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots: (0 slots) slave replicates 506776f910a52e45987785199e4fd293956ac1c5 M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots: (0 slots) master M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Send CLUSTER MEET to node 192.168.0.43:6382 to make it join the cluster. [OK] New node added correctly. [root@node1 ~]#
檢視現有叢集資訊
[root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 0 keys | 5461 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 5461 slots | 1 slaves. 192.168.0.43:6382 (43d6e13d...) -> 0 keys | 0 slots | 0 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 0 slots | 0 slaves. 192.168.0.42:6379 (506776f9...) -> 0 keys | 5462 slots | 1 slaves. [OK] 0 keys in 5 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots: (0 slots) slave replicates 506776f910a52e45987785199e4fd293956ac1c5 M: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382 slots: (0 slots) master M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots: (0 slots) master M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 ~]# redis-cli -a admin -c cluster nodes Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379@16379 master - 0 1592498237487 3 connected 10923-16383 eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380@16380 slave 91e34830f16e45110e37618540628587d5ecc7e2 0 1592498238525 5 connected 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379@16379 myself,master - 0 1592498215000 1 connected 0-5460 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380@16380 slave 506776f910a52e45987785199e4fd293956ac1c5 0 1592498234346 6 connected 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382@16382 master - 0 1592498236438 7 connected 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381@16381 master - 0 1592498235388 0 connected 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379@16379 master - 0 1592498239566 2 connected 5461-10922 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380@16380 slave 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 0 1592498233609 4 connected [root@node1 ~]#
提示：可以看到對應叢集上新加了兩個節點，都是master角色，並且新加的兩個節點都沒有slave和slot；
分配槽位給192.168.0.43：6381
[root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.41:6379
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.0.41:6379 (91e34830...) -> 0 keys | 5461 slots | 1 slaves.
192.168.0.43:6379 (0479a31d...) -> 0 keys | 5461 slots | 1 slaves.
192.168.0.43:6382 (43d6e13d...) -> 0 keys | 0 slots | 0 slaves.
192.168.0.43:6381 (95fa2115...) -> 0 keys | 0 slots | 0 slaves.
192.168.0.42:6379 (506776f9...) -> 0 keys | 5462 slots | 1 slaves.
[OK] 0 keys in 5 masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 192.168.0.41:6379)
M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380
slots: (0 slots) slave
replicates 91e34830f16e45110e37618540628587d5ecc7e2
S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380
slots: (0 slots) slave
replicates 506776f910a52e45987785199e4fd293956ac1c5
M: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382
slots: (0 slots) master
M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381
slots: (0 slots) master
M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380
slots: (0 slots) slave
replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@node1 ~]# redis-cli -a admin --cluster reshard 192.168.0.41:6379
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing Cluster Check (using node 192.168.0.41:6379)
M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380
slots: (0 slots) slave
replicates 91e34830f16e45110e37618540628587d5ecc7e2
S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380
slots: (0 slots) slave
replicates 506776f910a52e45987785199e4fd293956ac1c5
M: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382
slots: (0 slots) master
M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381
slots: (0 slots) master
M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380
slots: (0 slots) slave
replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617
[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)? 4096
What is the receiving node ID? 95fa21156efabc1e07b07b0bdbe52bf8fe004b86
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
Ready to move 4096 slots.
Source nodes:
M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
M: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382
slots: (0 slots) master
M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
Destination node:
M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381
slots: (0 slots) master
Resharding plan:
Moving slot 5461 from 506776f910a52e45987785199e4fd293956ac1c5
Moving slot 5462 from 506776f910a52e45987785199e4fd293956ac1c5
Moving slot 5463 from 506776f910a52e45987785199e4fd293956ac1c5
Moving slot 5464 from 506776f910a52e45987785199e4fd293956ac1c5
Moving slot 5465 from 506776f910a52e45987785199e4fd293956ac1c5
Moving slot 5466 from 506776f910a52e45987785199e4fd293956ac1c5
Moving slot 5467 from 506776f910a52e45987785199e4fd293956ac1c5
Moving slot 5468 from 506776f910a52e45987785199e4fd293956ac1c5
Moving slot 5469 from 506776f910a52e45987785199e4fd293956ac1c5
……省略部分內容……
Moving slot 12284 from 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617
Moving slot 12285 from 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617
Moving slot 12286 from 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617
Moving slot 12287 from 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617
Do you want to proceed with the proposed reshard plan (yes/no)? yes
Moving slot 5461 from 192.168.0.42:6379 to 192.168.0.43:6381:
Moving slot 5462 from 192.168.0.42:6379 to 192.168.0.43:6381:
Moving slot 5463 from 192.168.0.42:6379 to 192.168.0.43:6381:
Moving slot 5464 from 192.168.0.42:6379 to 192.168.0.43:6381:
……省略部分內容……
Moving slot 12285 from 192.168.0.43:6379 to 192.168.0.43:6381:
Moving slot 12286 from 192.168.0.43:6379 to 192.168.0.43:6381:
Moving slot 12287 from 192.168.0.43:6379 to 192.168.0.43:6381:
[root@node1 ~]#
提示：這個和redis-trib.rb命令使用沒有什麼區別；
檢視新分配的槽位資訊
[root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6382 (43d6e13d...) -> 0 keys | 0 slots | 0 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 4096 slots | 0 slaves. 192.168.0.42:6379 (506776f9...) -> 0 keys | 4096 slots | 1 slaves. [OK] 0 keys in 5 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[1365-5460] (4096 slots) master 1 additional replica(s) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots: (0 slots) slave replicates 506776f910a52e45987785199e4fd293956ac1c5 M: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382 slots: (0 slots) master M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 ~]#
提示：可以看到現在叢集有4個節點都分配了4096個slot，還有一個沒有slot；
更改節點（192.168.0.43：6382）為新節點（192.168.0.43：6381）的slave
[root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6382 (43d6e13d...) -> 0 keys | 0 slots | 0 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 4096 slots | 0 slaves. 192.168.0.42:6379 (506776f9...) -> 0 keys | 4096 slots | 1 slaves. [OK] 0 keys in 5 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[1365-5460] (4096 slots) master 1 additional replica(s) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots: (0 slots) slave replicates 506776f910a52e45987785199e4fd293956ac1c5 M: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382 slots: (0 slots) master M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 ~]# redis-cli -h 192.168.0.43 -p 6382 -a admin -c cluster replicate 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. OK [root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.42:6379 (506776f9...) -> 0 keys | 4096 slots | 1 slaves. [OK] 0 keys in 4 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots:[1365-5460] (4096 slots) master 1 additional replica(s) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 91e34830f16e45110e37618540628587d5ecc7e2 S: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots: (0 slots) slave replicates 506776f910a52e45987785199e4fd293956ac1c5 S: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master 1 additional replica(s) M: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 ~]#
提示：我上面使用-c在shell上連線redis執行命令，這個和互動式執行命令一樣的效果；從上面的資訊可以看到192.168.0.43:6381已經有一個slave了，對應192.168.0.43:6382也沒有出現到master列表中了；
驗證：向叢集中讀寫資料
[root@node1 ~]# redis-cli -a admin Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 127.0.0.1:6379> KEYS * (empty list or set) 127.0.0.1:6379> set aa bb (error) MOVED 1180 192.168.0.43:6381 127.0.0.1:6379> set cc dd (error) MOVED 700 192.168.0.43:6381 127.0.0.1:6379> set k v (error) MOVED 7629 192.168.0.42:6379 127.0.0.1:6379> set kk vv OK 127.0.0.1:6379> get kk "vv" 127.0.0.1:6379>
提示：從上面的結果看，讀寫都可以正常執行，也能夠正常的把對應的key進行計算，並告訴我們該到那個節點上執行對應的key讀寫操作；
驗證：停掉叢集中任意一臺master，看看對應slave是否提升為master？
[root@node2 redis]# redis-cli -a admin --cluster info 192.168.0.42 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. [ERR] Invalid arguments: you need to pass either a valid address (ie. 120.0.0.1:7000) or space separated IP and port (ie. 120.0.0.1 7000) [root@node2 redis]# [root@node2 redis]# redis-cli -a admin --cluster info 192.168.0.42:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.42:6379 (506776f9...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.41:6379 (91e34830...) -> 1 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 4096 slots | 1 slaves. [OK] 1 keys in 4 masters. 0.00 keys per slot on average. [root@node2 redis]# ps -ef |grep redis root 20256 1 0 11:40 ? 00:00:15 redis-server 0.0.0.0:6379 [cluster] root 20258 1 0 11:40 ? 00:00:13 redis-server 0.0.0.0:6380 [cluster] root 20318 1926 0 13:04 pts/1 00:00:00 grep --color=auto redis [root@node2 redis]# kill -9 20256 [root@node2 redis]# redis-cli -a admin --cluster info 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. Could not connect to Redis at 192.168.0.42:6379: Connection refused *** WARNING: 192.168.0.43:6380 claims to be slave of unknown node ID 506776f910a52e45987785199e4fd293956ac1c5. 192.168.0.41:6379 (91e34830...) -> 1 keys | 4096 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 4096 slots | 1 slaves. [OK] 1 keys in 3 masters. 0.00 keys per slot on average. [root@node2 redis]# redis-cli -a admin --cluster info 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. Could not connect to Redis at 192.168.0.42:6379: Connection refused 192.168.0.41:6379 (91e34830...) -> 1 keys | 4096 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 0 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 4096 slots | 1 slaves. [OK] 1 keys in 4 masters. 0.00 keys per slot on average. [root@node2 redis]#
提示：可以看到對應slave是能夠被提升為master的；
驗證：把對應當機的節點啟動起來，看看是否自動降級為slave呢？
[root@node2 redis]# redis-cli -a admin --cluster info 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. Could not connect to Redis at 192.168.0.42:6379: Connection refused 192.168.0.41:6379 (91e34830...) -> 1 keys | 4096 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 0 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 4096 slots | 1 slaves. [OK] 1 keys in 4 masters. 0.00 keys per slot on average. [root@node2 redis]# redis-server /usr/local/redis/6379/etc/redis.conf [root@node2 redis]# redis-cli -a admin --cluster info 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 1 keys | 4096 slots | 1 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 0 keys | 4096 slots | 1 slaves. [OK] 1 keys in 4 masters. 0.00 keys per slot on average. [root@node2 redis]# redis-cli -a admin -h 192.168.0.42 -p 6379 -c 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:192.168.0.43 master_port:6380 master_link_status:up master_last_io_seconds_ago:3 master_sync_in_progress:0 slave_repl_offset:6594 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:7b45a2b847aba7e40e3a6b7f39d4511fa2a62b6a master_replid2:0000000000000000000000000000000000000000 master_repl_offset:6594 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:6497 repl_backlog_histlen:98 [root@node2 redis]#
提示：當192.168.0.42：6379啟動後，自動降級為slave，並從屬192.168.0.43：6380；
動態刪除叢集中的節點
把192.168.0.41：6379上的slot移動到192.168.0.43：6381
[root@node1 ~]# redis-cli -a admin --cluster reshard 192.168.0.41:6379
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing Cluster Check (using node 192.168.0.41:6379)
M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379
slots:[1365-5460] (4096 slots) master
1 additional replica(s)
M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379
slots:[12288-16383] (4096 slots) master
1 additional replica(s)
S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380
slots: (0 slots) slave
replicates 91e34830f16e45110e37618540628587d5ecc7e2
M: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380
slots:[6827-10922] (4096 slots) master
1 additional replica(s)
S: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382
slots: (0 slots) slave
replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86
M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381
slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master
1 additional replica(s)
S: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379
slots: (0 slots) slave
replicates 6274aa87409a801311e580cb19d185c1d53bfa1f
S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380
slots: (0 slots) slave
replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617
[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)? 4096
What is the receiving node ID? 95fa21156efabc1e07b07b0bdbe52bf8fe004b86
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: 91e34830f16e45110e37618540628587d5ecc7e2
Source node #2: done
Moving slot 5457 from 91e34830f16e45110e37618540628587d5ecc7e2
Moving slot 5458 from 91e34830f16e45110e37618540628587d5ecc7e2
Moving slot 5459 from 91e34830f16e45110e37618540628587d5ecc7e2
Moving slot 5460 from 91e34830f16e45110e37618540628587d5ecc7e2
Do you want to proceed with the proposed reshard plan (yes/no)? yes
Moving slot 1365 from 192.168.0.41:6379 to 192.168.0.43:6381:
Moving slot 1366 from 192.168.0.41:6379 to 192.168.0.43:6381:
Moving slot 1367 from 192.168.0.41:6379 to 192.168.0.43:6381:
……省略部分內容……
Moving slot 5457 from 192.168.0.41:6379 to 192.168.0.43:6381:
Moving slot 5458 from 192.168.0.41:6379 to 192.168.0.43:6381:
Moving slot 5459 from 192.168.0.41:6379 to 192.168.0.43:6381:
Moving slot 5460 from 192.168.0.41:6379 to 192.168.0.43:6381:
[root@node1 ~]#
提示：在redis5上遷移是，即便對應節點上有資料，也可以直接遷移，並且把對應應資料以便遷移到指定的節點上去了；
檢視遷移後的叢集資訊
[root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.41:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 0 keys | 0 slots | 0 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 1 keys | 8192 slots | 2 slaves. [OK] 1 keys in 4 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.41:6379) M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots: (0 slots) master M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 M: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-6826],[10923-12287] (8192 slots) master 2 additional replica(s) S: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots: (0 slots) slave replicates 6274aa87409a801311e580cb19d185c1d53bfa1f S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 ~]#
提示：可以看到對應節點上的key和slave隨著slot的清空遷移而遷移；
驗證：登入對應的節點上檢視192.168.0.41：6379上的key是否遷移到192.168.0.43：6381上了？
[root@node1 ~]# redis-cli -h 192.168.0.43 -p 6381 192.168.0.43:6381> AUTH admin OK 192.168.0.43:6381> KEYS * 1) "kk" 192.168.0.43:6381> get kk "vv" 192.168.0.43:6381>
提示：可以看到我們之前在192.168.0.41：6379上寫入的key已經遷移到192.168.0.43：6381上了；
把192.168.0.41：6379從叢集中刪除
[root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.42:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379 (91e34830...) -> 0 keys | 0 slots | 0 slaves. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 1 keys | 8192 slots | 2 slaves. [OK] 1 keys in 4 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.42:6379) S: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots: (0 slots) slave replicates 6274aa87409a801311e580cb19d185c1d53bfa1f S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 M: 91e34830f16e45110e37618540628587d5ecc7e2 192.168.0.41:6379 slots: (0 slots) master S: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) M: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-6826],[10923-12287] (8192 slots) master 2 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 ~]# redis-cli -a admin --cluster del-node 192.168.0.42:6379 91e34830f16e45110e37618540628587d5ecc7e2 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. >>> Removing node 91e34830f16e45110e37618540628587d5ecc7e2 from cluster 192.168.0.42:6379 >>> Sending CLUSTER FORGET messages to the cluster... >>> SHUTDOWN the node. [root@node1 ~]# redis-cli -a admin --cluster info 192.168.0.42:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 1 keys | 8192 slots | 2 slaves. [OK] 1 keys in 3 masters. 0.00 keys per slot on average. [root@node1 ~]#
提示：從上面的資訊可以看到對應節點從叢集中刪除了；對應節點的slave被遷移到新的master上去了；
刪除slave
[root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.42:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 1 keys | 8192 slots | 2 slaves. [OK] 1 keys in 3 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.42:6379) S: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots: (0 slots) slave replicates 6274aa87409a801311e580cb19d185c1d53bfa1f S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 S: 43d6e13d06019af045e378ddc3e82b15b41ebdcd 192.168.0.43:6382 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) M: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-6826],[10923-12287] (8192 slots) master 2 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@node1 ~]# redis-cli -a admin --cluster del-node 192.168.0.42:6379 43d6e13d06019af045e378ddc3e82b15b41ebdcd Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. >>> Removing node 43d6e13d06019af045e378ddc3e82b15b41ebdcd from cluster 192.168.0.42:6379 >>> Sending CLUSTER FORGET messages to the cluster... >>> SHUTDOWN the node. [root@node1 ~]# redis-cli -a admin --cluster info 192.168.0.42:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 1 keys | 8192 slots | 1 slaves. [OK] 1 keys in 3 masters. 0.00 keys per slot on average. [root@node1 ~]#
提示：對應slave可以直接刪除，因為slave通常是沒有slot槽位的；
驗證：把192.168.0.41：6379啟動起來，看看是否還會回到叢集？
[root@node1 ~]# ss -tnl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:6380 *:* LISTEN 0 128 *:22 *:* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 128 *:16380 *:* LISTEN 0 128 :::22 :::* LISTEN 0 100 ::1:25 :::* [root@node1 ~]# redis-server /usr/local/redis/6379/etc/redis.conf [root@node1 ~]# ss -tnl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:6379 *:* LISTEN 0 128 *:6380 *:* LISTEN 0 128 *:22 *:* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 128 *:16379 *:* LISTEN 0 128 *:16380 *:* LISTEN 0 128 :::22 :::* LISTEN 0 100 ::1:25 :::* [root@node1 ~]# redis-cli -a admin --cluster info 192.168.0.42:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 1 keys | 8192 slots | 1 slaves. [OK] 1 keys in 3 masters. 0.00 keys per slot on average. [root@node1 ~]# redis-cli -a admin --cluster check 192.168.0.42:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 1 keys | 8192 slots | 1 slaves. [OK] 1 keys in 3 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.42:6379) S: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots: (0 slots) slave replicates 6274aa87409a801311e580cb19d185c1d53bfa1f S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) M: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-6826],[10923-12287] (8192 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@node1 ~]#
提示：可以看到這裡和redis3/4不同，這裡啟動當機後的server，它並不會重新回到叢集中來；
驗證：啟動刪除的slave節點，看看是否回到叢集？
[root@node03 redis]# ss -tnl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:6379 *:* LISTEN 0 128 *:6380 *:* LISTEN 0 128 *:6381 *:* LISTEN 0 128 *:22 *:* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 128 *:16379 *:* LISTEN 0 128 *:16380 *:* LISTEN 0 128 *:16381 *:* LISTEN 0 128 :::22 :::* LISTEN 0 100 ::1:25 :::* [root@node03 redis]# redis-server /usr/local/redis/6382/etc/redis.conf [root@node03 redis]# ss -tnl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:6379 *:* LISTEN 0 128 *:6380 *:* LISTEN 0 128 *:6381 *:* LISTEN 0 128 *:6382 *:* LISTEN 0 128 *:22 *:* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 128 *:16379 *:* LISTEN 0 128 *:16380 *:* LISTEN 0 128 *:16381 *:* LISTEN 0 128 *:16382 *:* LISTEN 0 128 :::22 :::* LISTEN 0 100 ::1:25 :::* [root@node03 redis]# redis-cli -a admin --cluster check 192.168.0.42:6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.43:6379 (0479a31d...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6380 (6274aa87...) -> 0 keys | 4096 slots | 1 slaves. 192.168.0.43:6381 (95fa2115...) -> 1 keys | 8192 slots | 1 slaves. [OK] 1 keys in 3 masters. 0.00 keys per slot on average. >>> Performing Cluster Check (using node 192.168.0.42:6379) S: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots: (0 slots) slave replicates 6274aa87409a801311e580cb19d185c1d53bfa1f S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) M: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-6826],[10923-12287] (8192 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@node03 redis]#
提示：可以看到啟動被刪除的slave以後，也不會重新回到叢集；
從外部redis server 匯入資料到叢集
在192.168.0.41：6379上建立一些key，來模擬外部redisserver
[root@node1 ~]# redis-cli -a admin -h 192.168.0.41 -p 6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379> KEYS * (empty list or set) 192.168.0.41:6379> set aa bb (error) MOVED 1180 192.168.0.43:6381 192.168.0.41:6379>
提示：往192.168.0.41：6379插入不了資料，我們把叢集功能給關掉試試？
關掉192.168.0.41:6379的叢集功能，再次啟動redis
[root@node1 ~]# grep ^#cluster /usr/local/redis/6379/etc/redis.conf #cluster-enabled yes #cluster-config-file redis-cluster-6379.conf [root@node1 ~]# ps -ef |grep redis root 19893 1 0 11:40 ? 00:00:21 redis-server 0.0.0.0:6380 [cluster] root 20002 1 0 13:35 ? 00:00:02 redis-server 0.0.0.0:6379 [cluster] root 20028 1491 0 13:49 pts/1 00:00:00 grep --color=auto redis [root@node1 ~]# kill -9 20002 [root@node1 ~]# redis-server /usr/local/redis/6379/etc/redis.conf [root@node1 ~]# ps -ef|grep redis root 19893 1 0 11:40 ? 00:00:21 redis-server 0.0.0.0:6380 [cluster] root 20030 1 0 13:49 ? 00:00:00 redis-server 0.0.0.0:6379 root 20035 1491 0 13:49 pts/1 00:00:00 grep --color=auto redis [root@node1 ~]#
提示：可以看到對應redis程式就不是一cluster方式執行了，接下來我們再來插入資料試試
[root@node1 ~]# redis-cli -a admin -h 192.168.0.41 -p 6379 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.0.41:6379> KEYS * (empty list or set) 192.168.0.41:6379> MSET k1 v1 k2 v2 k3 v3 k4 v4 OK 192.168.0.41:6379> KEYS * 1) "k3" 2) "k2" 3) "k4" 4) "k1" 192.168.0.41:6379>
提示：可以看到現在再插入資料就沒有問題了；
將192.168.0.41：6379上的資料匯入叢集
提示：匯入資料時，提示我們沒有認證；這裡需要注意一點，匯入資料之前需要關閉各 redis 伺服器的密碼，包括叢集中的各 node 和源 Redis server，避免認證帶來的環境不一致從而無法匯入，可以加引數--cluster-replace 強制替換 Redis cluster 已有的 key。
關閉叢集各節點認證密碼和外部redisserver
再次將192.168.0.41：6379上的資料匯入到叢集
[root@node1 ~]# redis-cli --cluster import 192.168.0.43:6379 --cluster-from 192.168.0.41:6379 --cluster-copy >>> Importing data from 192.168.0.41:6379 to cluster 192.168.0.43:6379 >>> Performing Cluster Check (using node 192.168.0.43:6379) M: 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 192.168.0.43:6379 slots:[12288-16383] (4096 slots) master 1 additional replica(s) M: 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 192.168.0.43:6381 slots:[0-6826],[10923-12287] (8192 slots) master 1 additional replica(s) M: 6274aa87409a801311e580cb19d185c1d53bfa1f 192.168.0.43:6380 slots:[6827-10922] (4096 slots) master 1 additional replica(s) S: eb23a3ff659ee22d03661cf312d5bf38b32686b5 192.168.0.42:6380 slots: (0 slots) slave replicates 95fa21156efabc1e07b07b0bdbe52bf8fe004b86 S: 506776f910a52e45987785199e4fd293956ac1c5 192.168.0.42:6379 slots: (0 slots) slave replicates 6274aa87409a801311e580cb19d185c1d53bfa1f S: 646b85ae18a63f36866c64edfba374559252dd1b 192.168.0.41:6380 slots: (0 slots) slave replicates 0479a31d9a7bcb88a9fc1c4227f0f3e06ea3b617 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. *** Importing 4 keys from DB 0 Migrating k3 to 192.168.0.43:6381: OK Migrating k2 to 192.168.0.43:6381: OK Migrating k4 to 192.168.0.43:6380: OK Migrating k1 to 192.168.0.43:6379: OK [root@node1 ~]#
提示：可以看到匯入資料成功；
驗證：在叢集各節點檢視匯入到資料
[root@node1 ~]# redis-cli -h 192.168.0.43 -p 6381 192.168.0.43:6381> KEYS * 1) "k2" 2) "k3" 3) "kk" 192.168.0.43:6381> get k2 "v2" 192.168.0.43:6381> get k3 "v3" 192.168.0.43:6381> quit [root@node1 ~]# redis-cli -h 192.168.0.43 -p 6380 192.168.0.43:6380> KEYS * 1) "k4" 192.168.0.43:6380> get k4 "v4" 192.168.0.43:6380> quit [root@node1 ~]# redis-cli -h 192.168.0.43 -p 6379 192.168.0.43:6379> KEYS * 1) "k1" 192.168.0.43:6379> get k1 "v1" 192.168.0.43:6379> quit [root@node1 ~]#
提示：可以看到外部redisserver上的資料被分別倒入到叢集中的各節點上儲存；在redis3/4上使用redis.trib.rb工具匯入資料始終提示錯誤，不知道什麼原因，所以建議在身材使用redis5以上做叢集比較好；