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redis-trib.rb命令詳解

 更新時間：2023年10月09日 10:07:01   作者：paul_hch  
redis-trib.rb是官方提供的Redis Cluster的管理工具,無需額外下載,默認位于源碼包的src目錄下,但因該工具是用ruby開發(fā)的,所以需要準備相關的依賴環(huán)境,這篇文章主要介紹了redis-trib.rb命令詳解,需要的朋友可以參考下

redis-trib.rb是官方提供的Redis Cluster的管理工具，無需額外下載，默認位于源碼包的src目錄下，但因該工具是用ruby開發(fā)的，所以需要準備相關的依賴環(huán)境。

準備redis-trib.rb的運行環(huán)境

wget https://cache.ruby-lang.org/pub/ruby/2.5/ruby-2.5.1.tar.gz
yum -y install zlib-devel
tar xvf ruby-2.5.1.tar.gz
cd ruby-2.5.1/
./configure -prefix=/usr/local/ruby
make
make install
cd /usr/local/ruby/
cp bin/ruby /usr/local/bin
cp bin/gem /usr/local/bin

安裝rubygem redis依賴

wget http://rubygems.org/downloads/redis-3.3.0.gem
gem install -l redis-3.3.0.gem

redis-trib.rb支持的操作

# redis-trib.rb help
Usage: redis-trib <command> <options> <arguments ...>
  create          host1:port1 ... hostN:portN
                  --replicas <arg>
  check           host:port
  info            host:port
  fix             host:port
                  --timeout <arg>
  reshard         host:port
                  --from <arg>
                  --to <arg>
                  --slots <arg>
                  --yes
                  --timeout <arg>
                  --pipeline <arg>
  rebalance       host:port
                  --weight <arg>
                  --auto-weights
                  --use-empty-masters
                  --timeout <arg>
                  --simulate
                  --pipeline <arg>
                  --threshold <arg>
  add-node        new_host:new_port existing_host:existing_port
                  --slave
                  --master-id <arg>
  del-node        host:port node_id
  set-timeout     host:port milliseconds
  call            host:port command arg arg .. arg
  import          host:port
                  --from <arg>
                  --copy
                  --replace
  help            (show this help)
For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.

支持的操作如下：

1. create：創(chuàng)建集群

2. check：檢查集群

3. info：查看集群信息

4. fix：修復集群

5. reshard：在線遷移slot

6. rebalance：平衡集群節(jié)點slot數(shù)量

7. add-node：添加新節(jié)點

8. del-node：刪除節(jié)點

9. set-timeout：設置節(jié)點的超時時間

10. call：在集群所有節(jié)點上執(zhí)行命令

11. import：將外部redis數(shù)據(jù)導入集群

創(chuàng)建集群

redis-trib.rb create --replicas 1 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384

--replicas參數(shù)指定集群中每個主節(jié)點配備幾個從節(jié)點，這里設置為1。

>>> Creating cluster
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:6379
127.0.0.1:6380
127.0.0.1:6381
Adding replica 127.0.0.1:6383 to 127.0.0.1:6379
Adding replica 127.0.0.1:6384 to 127.0.0.1:6380
Adding replica 127.0.0.1:6382 to 127.0.0.1:6381
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: bc775f9c4dea40820b82c9451778b1fcd42f92bc 127.0.0.1:6379
   slots:0-5460 (5461 slots) master
M: 3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380
   slots:5461-10922 (5462 slots) master
M: d874f003257f1fb036bbd856ca605172a1741232 127.0.0.1:6381
   slots:10923-16383 (5461 slots) master
S: 648eb314863b82aaa676380be7db2ec307f5547d 127.0.0.1:6382
   replicates bc775f9c4dea40820b82c9451778b1fcd42f92bc
S: 65a6efb441ac44c348f7da8c62e26b888cda7c48 127.0.0.1:6383
   replicates 3b27d00d13706a032a92ff6b0a914af272dcaaf2
S: 57bda956485109552547aef6c77fba43d2124abf 127.0.0.1:6384
   replicates d874f003257f1fb036bbd856ca605172a1741232
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 127.0.0.1:6379)
M: bc775f9c4dea40820b82c9451778b1fcd42f92bc 127.0.0.1:6379
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
S: 648eb314863b82aaa676380be7db2ec307f5547d 127.0.0.1:6382
   slots: (0 slots) slave
   replicates bc775f9c4dea40820b82c9451778b1fcd42f92bc
M: 3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 57bda956485109552547aef6c77fba43d2124abf 127.0.0.1:6384
   slots: (0 slots) slave
   replicates d874f003257f1fb036bbd856ca605172a1741232
S: 65a6efb441ac44c348f7da8c62e26b888cda7c48 127.0.0.1:6383
   slots: (0 slots) slave
   replicates 3b27d00d13706a032a92ff6b0a914af272dcaaf2
M: d874f003257f1fb036bbd856ca605172a1741232 127.0.0.1:6381
   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.

16384個槽全部被分配，集群創(chuàng)建成功。注意：給redis-trib.rb的節(jié)點地址必須是不包含任何槽/數(shù)據(jù)的節(jié)點，否則會拒絕創(chuàng)建集群。

>>> Creating cluster
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
[ERR] Node 127.0.0.1:6379 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.

關于主從節(jié)點的選擇及槽的分配，其算法如下：

1> 把節(jié)點按照host分類，這樣保證master節(jié)點能分配到更多的主機中。

2> 遍歷host列表，從每個host列表中彈出一個節(jié)點，放入interleaved數(shù)組。直到所有的節(jié)點都彈出為止。

3> 將interleaved數(shù)組中前master個數(shù)量的節(jié)點保存到masters數(shù)組中。

4> 計算每個master節(jié)點負責的slot數(shù)量，16384除以master數(shù)量取整，這里記為N。

5> 遍歷masters數(shù)組，每個master分配N個slot，最后一個master，分配剩下的slot。

6> 接下來為master分配slave，分配算法會盡量保證master和slave節(jié)點不在同一臺主機上。對于分配完指定slave數(shù)量的節(jié)點，還有多余的節(jié)點，也會為這些節(jié)點尋找master。分配算法會遍歷兩次masters數(shù)組。

7> 第一次遍歷master數(shù)組，在余下的節(jié)點列表找到replicas數(shù)量個slave。每個slave為第一個和master節(jié)點host不一樣的節(jié)點，如果沒有不一樣的節(jié)點，則直接取出余下列表的第一個節(jié)點。

8> 第二次遍歷是分配節(jié)點數(shù)除以replicas不為整數(shù)而多出的一部分節(jié)點。

檢查集群狀態(tài)

redis-trib.rb check 127.0.0.1:6379

指定任意一個節(jié)點即可。

/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Performing Cluster Check (using node 127.0.0.1:6379)
M: bc775f9c4dea40820b82c9451778b1fcd42f92bc 127.0.0.1:6379
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
S: 648eb314863b82aaa676380be7db2ec307f5547d 127.0.0.1:6382
   slots: (0 slots) slave
   replicates bc775f9c4dea40820b82c9451778b1fcd42f92bc
M: 3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 57bda956485109552547aef6c77fba43d2124abf 127.0.0.1:6384
   slots: (0 slots) slave
   replicates d874f003257f1fb036bbd856ca605172a1741232
S: 65a6efb441ac44c348f7da8c62e26b888cda7c48 127.0.0.1:6383
   slots: (0 slots) slave
   replicates 3b27d00d13706a032a92ff6b0a914af272dcaaf2
M: d874f003257f1fb036bbd856ca605172a1741232 127.0.0.1:6381
   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.

查看集群信息

redis-trib.rb info 127.0.0.1:6383

/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
127.0.0.1:6380 (3b27d00d...) -> 0 keys | 5462 slots | 1 slaves.
127.0.0.1:6381 (d874f003...) -> 1 keys | 5461 slots | 1 slaves.
127.0.0.1:6379 (bc775f9c...) -> 0 keys | 5461 slots | 1 slaves.
[OK] 1 keys in 3 masters.
0.00 keys per slot on average.

修復集群

目前fix命令能修復兩種異常，

1. 節(jié)點中存在處于遷移中（importing或migrating狀態(tài)）的slot。

2. 節(jié)點中存在未分配的slot。

其它異常不能通過fix命令修復。

[root@slowtech conf]# redis-trib.rb fix 127.0.0.1:6379
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Performing Cluster Check (using node 127.0.0.1:6379)
S: d826c5fd98efa8a17a880e9a90a25f06c88e6ae9 127.0.0.1:6379
   slots: (0 slots) slave
   replicates a8b3d0f9b12d63dab3b7337d602245d96dd55844
S: 55c05d5b0dfea0d52f88548717ddf24975268de6 127.0.0.1:6383
   slots: (0 slots) slave
   replicates a8b3d0f9b12d63dab3b7337d602245d96dd55844
M: f413fb7e6460308b17cdb71442798e1341b56cbc 127.0.0.1:6381
   slots:50-16383 (16334 slots) master
   2 additional replica(s)
S: beba753c5a63607fa66d9ec7427ed9a511ea136e 127.0.0.1:6382
   slots: (0 slots) slave
   replicates f413fb7e6460308b17cdb71442798e1341b56cbc
S: 83797d518e56c235272402611477f576973e9d34 127.0.0.1:6384
   slots: (0 slots) slave
   replicates f413fb7e6460308b17cdb71442798e1341b56cbc
M: a8b3d0f9b12d63dab3b7337d602245d96dd55844 127.0.0.1:6380
   slots:0-49 (50 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.

在線遷移slot

slot計算方法

slot ( 4096 ) = 16384 / master 個數(shù)（4）

交互環(huán)境中使用

如，就是將127.0.0.1:6379的slot遷移到3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380

redis-trib.rb reshard 127.0.0.1:6379

指定任意一個節(jié)點即可。

/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Performing Cluster Check (using node 127.0.0.1:6379)
M: bc775f9c4dea40820b82c9451778b1fcd42f92bc 127.0.0.1:6379
   slots:3225-5460 (2236 slots) master
   1 additional replica(s)
S: 648eb314863b82aaa676380be7db2ec307f5547d 127.0.0.1:6382
   slots: (0 slots) slave
   replicates bc775f9c4dea40820b82c9451778b1fcd42f92bc
M: 3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380
   slots:0-3224,5461-13958 (11723 slots) master
   1 additional replica(s)
S: 57bda956485109552547aef6c77fba43d2124abf 127.0.0.1:6384
   slots: (0 slots) slave
   replicates d874f003257f1fb036bbd856ca605172a1741232
S: 65a6efb441ac44c348f7da8c62e26b888cda7c48 127.0.0.1:6383
   slots: (0 slots) slave
   replicates 3b27d00d13706a032a92ff6b0a914af272dcaaf2
M: d874f003257f1fb036bbd856ca605172a1741232 127.0.0.1:6381
   slots:13959-16383 (2425 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.
How many slots do you want to move (from 1 to 16384)? 200
What is the receiving node ID? 3b27d00d13706a032a92ff6b0a914af272dcaaf2
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:

它首先會提示需要遷移多個槽，我這里寫的是200。

接著它會提示需要將槽遷移到哪個節(jié)點，這里必須寫節(jié)點ID。

緊跟著它會提示槽從哪些節(jié)點中遷出。

如果指定為all，則待遷移的槽在剩余節(jié)點中平均分配，在這里，127.0.0.1:6379和127.0.0.1:6381各遷移100個槽出來。

也可從指定節(jié)點中遷出，這個時候，必須指定源節(jié)點的節(jié)點ID，最后以done結(jié)束，如下所示，

Source node #1:bc775f9c4dea40820b82c9451778b1fcd42f92bc
Source node #2:done
Ready to move 200 slots.
  Source nodes:
    M: bc775f9c4dea40820b82c9451778b1fcd42f92bc 127.0.0.1:6379
   slots:3225-5460 (2236 slots) master
   1 additional replica(s)
  Destination node:
    M: 3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380
   slots:0-3224,5461-13958 (11723 slots) master
   1 additional replica(s)
  Resharding plan:
    Moving slot 3225 from bc775f9c4dea40820b82c9451778b1fcd42f92bc
    Moving slot 3226 from bc775f9c4dea40820b82c9451778b1fcd42f92bc
    Moving slot 3227 from bc775f9c4dea40820b82c9451778b1fcd42f92bc
    ...
Do you want to proceed with the proposed reshard plan (yes/no)? yes
Moving slot 3225 from 127.0.0.1:6379 to 127.0.0.1:6380: .
Moving slot 3226 from 127.0.0.1:6379 to 127.0.0.1:6380: 
Moving slot 3227 from 127.0.0.1:6379 to 127.0.0.1:6380: ..
Moving slot 3228 from 127.0.0.1:6379 to 127.0.0.1:6380: 
...

最后，提示是否繼續(xù)進行。

命令行中使用

redis-trib.rb reshard host:port --from <arg> --to <arg> --slots <arg> --yes --timeout <arg> --pipeline <arg>

其中，

host:port：必傳參數(shù)，集群內(nèi)任意節(jié)點地址，用來獲取整個集群信息。

--from：源節(jié)點id，如果有多個源節(jié)點，使用逗號分隔，如果是all，則源節(jié)點為集群內(nèi)出目標節(jié)點外的其它所有主節(jié)點。

--to：目標節(jié)點id，只能填寫一個。

--slots：需要遷移槽的總數(shù)量。

--yes：遷移無需用戶手動確認。

--timeout：控制每次migrate操作的超時時間，默認為60000毫秒。

--pipeline：控制每次批量遷移鍵的數(shù)量，默認為10。

如，

redis-trib.rb reshard --from a8b3d0f9b12d63dab3b7337d602245d96dd55844 --to f413fb7e6460308b17cdb71442798e1341b56cbc  --slots 10923 --yes --pipeline 20 127.0.0.1:6383

平衡集群節(jié)點slot數(shù)量

rebalance       host:port
                  --weight <arg>
                  --auto-weights
                  --use-empty-masters
                  --timeout <arg>
                  --simulate
                  --pipeline <arg>
                  --threshold <arg>

其中，

--weight <arg>：節(jié)點的權(quán)重，格式為node_id=weight，如果需要為多個節(jié)點分配權(quán)重的話，需要添加多個--weight <arg>參數(shù)，即--weight b31e3a2e=5 --weight 60b8e3a1=5，node_id可為節(jié)點名稱的前綴，只要保證前綴位數(shù)能唯一區(qū)分該節(jié)點即可。沒有傳遞–weight的節(jié)點的權(quán)重默認為1。

--auto-weights：自動將每個節(jié)點的權(quán)重默認為1。如果--weight和--auto-weights同時指定，則--auto-weights會覆蓋前者。

--threshold <arg>：只有節(jié)點需要遷移的slot閾值超過threshold，才會執(zhí)行rebalance操作。

--use-empty-masters：默認沒有分配slot節(jié)點的master是不參與rebalance的。如果要讓其參與rebalance，需添加該參數(shù)。

--timeout <arg>：設置migrate命令的超時時間。

--simulate：設置該參數(shù)，只會提示用戶會遷移哪些slots，而不會執(zhí)行真正的遷移操作。

--pipeline <arg>：定義cluster getkeysinslot命令一次取出的key數(shù)量，不傳的話使用默認值為10。

如，

# redis-trib.rb rebalance --weight a8b3d0f9b12d63dab3b7337d602245d96dd55844=3 --weight f413fb7e6460308b17cdb71442798e1341b56cbc=2  --use-empty-masters  127.0.0.1:6379
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Performing Cluster Check (using node 127.0.0.1:6379)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Rebalancing across 2 nodes. Total weight = 5.0
Moving 3824 slots from 127.0.0.1:6380 to 127.0.0.1:6381
#########################################...

刪除節(jié)點

redis-trib.rb del-node host:port node_id

在刪除節(jié)點之前，其對應的槽必須為空，所以，在進行節(jié)點刪除動作之前，必須使用redis-trib.rb reshard將其遷移出去。

需要注意的是，如果某個節(jié)點的槽被完全遷移出去，其對應的slave也會隨著更新，指向遷移的目標節(jié)點。

# redis-trib.rb del-node 127.0.0.1:6379 8f7836a9a14fb6638530b42e04f5e58e28de0a6c
>>> Removing node 8f7836a9a14fb6638530b42e04f5e58e28de0a6c from cluster 127.0.0.1:6379
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.

添加新節(jié)點

redis-trib add-node new_host:new_port existing_host:existing_port --slave --master-id <arg>

其中，

new_host:new_port：待添加的節(jié)點，必須確保其為空或不在其它集群中。否則，會提示以下錯誤。

[ERR] Node 127.0.0.1:6379 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.

所以，線上建議使用redis-trib.rb添加新節(jié)點，因為其會對新節(jié)點的狀態(tài)進行檢查。如果手動使用cluster meet命令加入已經(jīng)存在于其它集群的節(jié)點，會造成被加入節(jié)點的集群合并到現(xiàn)有集群的情況，從而造成數(shù)據(jù)丟失和錯亂，后果非常嚴重，線上謹慎操作。

existing_host:existing_port：集群中任意一個節(jié)點的地址。

如果添加的是主節(jié)點，只需指定源節(jié)點和目標節(jié)點的地址即可。

redis-trib.rb add-node 127.0.0.1:6379 127.0.0.1:6384

如果添加的是從節(jié)點，其語法如下，

redis-trib.rb add-node --slave --master-id f413fb7e6460308b17cdb71442798e1341b56cbc 127.0.0.1:6379 127.0.0.1:6384

注意：--slave和--master-id必須寫在前面，同樣的參數(shù)，如果是下面這樣寫法，會提示錯誤，

# redis-trib.rb add-node 127.0.0.1:6379 127.0.0.1:6384 --slave --master-id f413fb7e6460308b17cdb71442798e1341b56cbc[ERR] Wrong number of arguments for specified sub command

添加從節(jié)點，可不設置--master-id，此時會隨機選擇主節(jié)點。

設置節(jié)點的超時時間

redis-trib.rb set-timeout host:port milliseconds

其實就是批量修改集群各節(jié)點的cluster-node-timeout參數(shù)。

# redis-trib.rb set-timeout 127.0.0.1:6379 20000
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Reconfiguring node timeout in every cluster node...
*** New timeout set for 127.0.0.1:6379
*** New timeout set for 127.0.0.1:6383
*** New timeout set for 127.0.0.1:6381
*** New timeout set for 127.0.0.1:6382
*** New timeout set for 127.0.0.1:6384
*** New timeout set for 127.0.0.1:6380
>>> New node timeout set. 6 OK, 0 ERR.

在集群所有節(jié)點上執(zhí)行命令

redis-trib.rb call host:port command arg arg .. arg

如，

[root@slowtech conf]# redis-trib.rb call 127.0.0.1:6379 set hello world
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Calling SET hello world
127.0.0.1:6379: MOVED 866 127.0.0.1:6381
127.0.0.1:6383: MOVED 866 127.0.0.1:6381
127.0.0.1:6381: OK
127.0.0.1:6382: MOVED 866 127.0.0.1:6381
127.0.0.1:6384: MOVED 866 127.0.0.1:6381
127.0.0.1:6380: MOVED 866 127.0.0.1:6381
[root@slowtech conf]# redis-trib.rb call 127.0.0.1:6379 get hello
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Calling GET hello
127.0.0.1:6379: MOVED 866 127.0.0.1:6381
127.0.0.1:6383: MOVED 866 127.0.0.1:6381
127.0.0.1:6381: world
127.0.0.1:6382: MOVED 866 127.0.0.1:6381
127.0.0.1:6384: MOVED 866 127.0.0.1:6381
127.0.0.1:6380: MOVED 866 127.0.0.1:6381

將外部redis數(shù)據(jù)導入集群

redis-trib.rb import --from 127.0.0.1:6378 127.0.0.1:6379

其內(nèi)部處理流程如下：

1> 通過load_cluster_info_from_node方法加載集群信息，check_cluster方法檢查集群是否健康。

2> 連接外部redis節(jié)點，如果外部節(jié)點開啟了cluster_enabled，則提示錯誤（[ERR] The source node should not be a cluster node.）

3> 通過scan命令遍歷外部節(jié)點，一次獲取1000條數(shù)據(jù)。

4> 遍歷這些key，計算出key對應的slot。

5> 執(zhí)行migrate命令,源節(jié)點是外部節(jié)點,目的節(jié)點是集群slot對應的節(jié)點，如果設置了--copy參數(shù)，則傳遞copy參數(shù)，其會保留源節(jié)點的key，如果設置了--replace，則傳遞replace參數(shù)。如果目標節(jié)點中存在同名key，其值會被覆蓋。兩個參數(shù)可同時指定。

6> 不停執(zhí)行scan命令，直到遍歷完所有key。

7> 遷移完成。

[root@slowtech conf]# redis-trib.rb import --from 127.0.0.1:6378 --replace  127.0.0.1:6379 
>>> Importing data from 127.0.0.1:6378 to cluster 
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Performing Cluster Check (using node 127.0.0.1:6379)
S: d826c5fd98efa8a17a880e9a90a25f06c88e6ae9 127.0.0.1:6379
   slots: (0 slots) slave
   replicates a8b3d0f9b12d63dab3b7337d602245d96dd55844
S: 55c05d5b0dfea0d52f88548717ddf24975268de6 127.0.0.1:6383
   slots: (0 slots) slave
   replicates a8b3d0f9b12d63dab3b7337d602245d96dd55844
M: f413fb7e6460308b17cdb71442798e1341b56cbc 127.0.0.1:6381
   slots:50-16383 (16334 slots) master
   2 additional replica(s)
S: beba753c5a63607fa66d9ec7427ed9a511ea136e 127.0.0.1:6382
   slots: (0 slots) slave
   replicates f413fb7e6460308b17cdb71442798e1341b56cbc
S: 83797d518e56c235272402611477f576973e9d34 127.0.0.1:6384
   slots: (0 slots) slave
   replicates f413fb7e6460308b17cdb71442798e1341b56cbc
M: a8b3d0f9b12d63dab3b7337d602245d96dd55844 127.0.0.1:6380
   slots:0-49 (50 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.
>>> Connecting to the source Redis instance
*** Importing 1 keys from DB 0
Migrating key5 to 127.0.0.1:6381: OK
從redis-trib.rb到集群加減節(jié)點實戰(zhàn)-CSDN博客https://blog.csdn.net/qq_40687433/article/details/131234885

從redis-trib.rb到集群加減節(jié)點實戰(zhàn)-CSDN博客https://blog.csdn.net/qq_40687433/article/details/131234885

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