Redis Cluster 添加/删除完整折騰步驟

Redis還是挺好玩的，今天測試了叢集的添加、删除節點、重配置設定slot等。更深入的了解redis的遊戲規則。步驟繁多，但是詳細。

環境解釋：

我是在一台Centos 6.9上測試的，各個redis節點以端口号區分。文中針對各個redis，我隻是以端口号代表。

<code>~~~~Master Node~~~~~</code>

<code>~~~~Slave Node~~~~~</code>

<code>~~~~用來折騰的Node~~~~~</code>

1. 建立redis叢集

注：更多redis叢集建立，請參閱

<code># ./redis-trib.rb </code><code>create</code> <code>--replicas 1 172.16.32.116:7000 172.16.32.116:7001 172.16.32.116:7002 172.16.32.116:8000 172.16.32.116:8001 172.16.32.116:8002</code>

<code>>>> Creating cluster</code>

<code>>>> Performing hash slots allocation </code><code>on</code> <code>6 nodes...</code>

<code>Using 3 masters:</code>

<code>Adding replica 172.16.32.116:8000 </code><code>to</code> <code>172.16.32.116:7000</code>

<code>Adding replica 172.16.32.116:8001 </code><code>to</code> <code>172.16.32.116:7001</code>

<code>Adding replica 172.16.32.116:8002 </code><code>to</code> <code>172.16.32.116:7002</code>

<code> </code><code>slots:0-5460 (5461 slots) master</code>

<code> </code><code>slots:5461-10922 (5462 slots) master</code>

<code> </code><code>slots:10923-16383 (5461 slots) master</code>

<code> </code><code>replicates a0b91f48e933c1f1d427c54917ce970bd25d29f8</code>

<code> </code><code>replicates 273107e5ac994d675749be0979556e761274bb93</code>

<code> </code><code>replicates 88fe075375295b59eabe69fa1438ed7c7c314f43</code>

<code>Can I </code><code>set</code> <code>the above configuration? (type </code><code>'yes'</code> <code>to</code> <code>accept): yes</code>

<code>>>> Nodes configuration updated</code>

<code>>>> Assign a different config epoch </code><code>to</code> <code>each node</code>

<code>>>> Sending CLUSTER MEET messages </code><code>to</code> <code>join</code> <code>the cluster</code>

<code>Waiting </code><code>for</code> <code>the cluster </code><code>to</code> <code>join</code><code>...</code>

<code>>>> Performing Cluster </code><code>Check</code> <code>(using node 172.16.32.116:7000)</code>

<code> </code><code>slots: (0 slots) master</code>

<code>[OK] </code><code>All</code> <code>nodes agree about slots configuration.</code>

<code>>>> </code><code>Check</code> <code>for</code> <code>open</code> <code>slots...</code>

<code>>>> </code><code>Check</code> <code>slots coverage...</code>

<code>[OK] </code><code>All</code> <code>16384 slots covered.</code>

2. 檢查叢集狀态

<code># ./redis-trib.rb </code><code>check</code> <code>172.16.32.116:7000</code>

<code> </code><code>1 additional replica(s)</code>

<code> </code><code>slots: (0 slots) slave</code>

~~~~~~~~~~~~~~~~~~~~~~~~~~~添加節點~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

3. 添加新節點redis-trib.rb add-node 新增節點名原叢集節點名

<code># ./redis-trib.rb </code><code>add</code><code>-node 172.16.32.116:9000 172.16.32.116:7000</code>

<code>>>> Adding node 172.16.32.116:9000 </code><code>to</code> <code>cluster 172.16.32.116:7000</code>

4. 檢視目前叢集狀态，9000是一個空的Master

<code># ./redis-cli -p 9000 cluster nodes</code>

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505321254767 1 connected 0-5460</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505321250759 2 connected 5461-10922</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505321251761 3 connected 10923-16383</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505321255769 3 connected</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505321253765 1 connected</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505321256771 2 connected</code>

5. 為9000配置設定slot， redis的solt是固定的，就16384個，隻能從其他節點擷取slot，然後配置設定到9000

<code># ./redis-trib.rb reshard 172.16.32.116:9000</code>

<code>>>> Performing Cluster </code><code>Check</code> <code>(using node 172.16.32.116:9000)</code>

<code> </code><code>0 additional replica(s)</code>

<code>How many slots do you want </code><code>to</code> <code>move</code> <code>(</code><code>from</code> <code>1 </code><code>to</code> <code>16384)? </code>

<code>What </code><code>is</code> <code>the receiving node ID? 364ae8322ab2627e25b05d45b702448c74afad10 Please enter </code><code>all</code> <code>the source node IDs.</code>

<code> </code><code>Type </code><code>'all'</code> <code>to</code> <code>use </code><code>all</code> <code>the nodes </code><code>as</code> <code>source nodes </code><code>for</code> <code>the hash slots.</code>

<code> </code><code>Type </code><code>'done'</code> <code>once you entered </code><code>all</code> <code>the source nodes IDs.</code>

<code>Source node #1:</code><code>all</code>

<code>Ready </code><code>to</code> <code>move</code> <code>300 slots.</code>

<code> </code><code>Source nodes:</code>

<code> </code><code>Destination node:</code>

<code> </code><code>Resharding plan:</code>

<code> </code><code>Moving slot 5461 </code><code>from</code> <code>273107e5ac994d675749be0979556e761274bb93</code>

<code> </code><code>Moving slot 5469 </code><code>from</code> <code>273107e5ac994d675749be0979556e761274bb93</code>

<code>Do you want </code><code>to</code> <code>proceed </code><code>with</code> <code>the proposed reshard plan (yes/</code><code>no</code><code>)? yes</code>

<code>Moving slot 5461 </code><code>from</code> <code>172.16.32.116:7001 </code><code>to</code> <code>172.16.32.116:9000:</code>

6. 可以看到，9000已經配置設定到的slot是0-98 5461-5561 10923-11021

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505324905062 1 connected 99-5460</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505324910075 2 connected 5562-10922</code>

<code>364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,master - 0 0 7 connected 0-98 5461-5561 10923-11021</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505324908070 3 connected</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505324911077 1 connected</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505324902057 3 connected 11022-16383</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505324909073 2 connected</code>

~~~~~~~~~~~~~~~~~~~~~~~~~~~将9000變為slave~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

7. 希望将9000變成7000的slave，但是由于有slot，執行失敗，需要先轉移slot

<code># redis-cli -c -p 9000 cluster replicate a0b91f48e933c1f1d427c54917ce970bd25d29f8</code>

<code>(error) ERR </code><code>To</code> <code>set</code> <code>a master the node must be empty </code><code>and</code> <code>without assigned slots.</code>

8. 删除節點也是不可以的，總之，隻要上面有slot。redis是不會讓你删除的，而且需要人工介入，rebalance這些slot之後才行

<code># ./redis-trib.rb del-node 172.16.32.116:9000 364ae8322ab2627e25b05d45b702448c74afad10</code>

<code>>>> Removing node 364ae8322ab2627e25b05d45b702448c74afad10 </code><code>from</code> <code>cluster 172.16.32.116:9000</code>

<code>[ERR] Node 172.16.32.116:9000 </code><code>is</code> <code>not</code> <code>empty! Reshard data away </code><code>and</code> <code>try again.</code>

9.重新配置設定9000的slot到7000上

<code># ./redis-trib.rb reshard 172.16.32.116:9000 <<<<<<重新配置設定slot</code>

<code> </code><code>slots:0-98,5461-5561,10923-11021 (299 slots) master</code>

<code> </code><code>slots:99-5460 (5362 slots) master</code>

<code> </code><code>slots:5562-10922 (5361 slots) master</code>

<code> </code><code>slots:11022-16383 (5362 slots) master</code>

<code>How many slots do you want </code><code>to</code> <code>move</code> <code>(</code><code>from</code> <code>1 </code><code>to</code> <code>16384)? 300 <<<9000節點全部需要遷移的節點</code>

<code>What </code><code>is</code> <code>the receiving node ID? a0b91f48e933c1f1d427c54917ce970bd25d29f8 <<<<<<7000的ID</code>

<code>Please enter </code><code>all</code> <code>the source node IDs.</code>

<code>Source node #1:364ae8322ab2627e25b05d45b702448c74afad10 <<<<<<9000的ID</code>

<code>Source node #2:done</code>

<code> </code><code>Moving slot 0 </code><code>from</code> <code>364ae8322ab2627e25b05d45b702448c74afad10</code>

<code> </code><code>Moving slot 11021 </code><code>from</code> <code>364ae8322ab2627e25b05d45b702448c74afad10</code>

<code>Moving slot 0 </code><code>from</code> <code>172.16.32.116:9000 </code><code>to</code> <code>172.16.32.116:7000:</code>

<code>Moving slot 1 </code><code>from</code> <code>172.16.32.116:9000 </code><code>to</code> <code>172.16.32.116:7000:</code>

10. 查詢，可以看到9000已經沒有slot了

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505328938056 8 connected 0-5561 10923-11021</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505328939059 2 connected 5562-10922</code>

<code>364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,master - 0 0 7 connected</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505328936053 3 connected</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505328933046 8 connected</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505328937054 3 connected 11022-16383</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505328934049 2 connected</code>

11. 再次執行指令，将9000變成7000的slave，成功

12. 檢視狀态,9000已經成為7000的slave

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329564286 8 connected 0-5561 10923-11021</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329561281 2 connected 5562-10922</code>

<code>364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 0 7 connected <<<<<<<<<<<<<<</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329558274 3 connected</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329554266 8 connected</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329563285 3 connected 11022-16383</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329562283 2 connected</code>

13. 删除節點9000，成功删除

<code>>>> Sending CLUSTER FORGET messages </code><code>to</code> <code>the cluster...</code>

<code>>>> SHUTDOWN the node.</code>

14. 連接配接9000，發現已經shutdown，無法連接配接

<code>Could </code><code>not</code> <code>connect</code> <code>to</code> <code>Redis </code><code>at</code> <code>127.0.0.1:9000: </code><code>Connection</code> <code>refused</code>

15. 檢視叢集狀态，9000已經不見了

<code># ./redis-cli -p 7000 cluster nodes</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329693835 3 connected 11022-16383</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329694837 2 connected 5562-10922</code>

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 myself,master - 0 0 8 connected 0-5561 10923-11021</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329696841 6 connected</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329695840 5 connected</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329692833 8 connected</code>

~~~~~~~~~~~~~~~~~~~~~~~~~~~再次啟動9000，發現不同~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

16. 再次啟動9000，發現一個有意思的事情。上面檢查7000，叢集已經沒有9000了

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329898241 3 connected 11022-16383</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329899242 2 connected 5562-10922</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329902249 6 connected</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329901246 5 connected</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329900244 8 connected</code>

17. 但是檢視9000，确仍然能看到整個叢集的資訊。說明，在删除節點的過程，隻是在原有叢集中删除9000的資訊。但是9000自身的資訊并沒有被删除，依然保留全部的資訊，隻是9000執行個體被關閉而已。

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329902003 8 connected 0-5561 10923-11021</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329903006 2 connected 5562-10922</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329906013 3 connected</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329908019 2 connected</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329904008 8 connected</code>

<code>364ae8322ab2627e25b05d45b702448c74afad10 172.16.32.116:9000 myself,slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 0 7 connected</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329907016 3 connected 11022-16383</code>

18. 而9000的全部資訊，是記錄在自身目錄的nodes.conf中

<code># more nodes.conf</code>

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329544244 8 connected 0-5561 10923-11021</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 master - 0 1505329542241 2 connected 5562-10922</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329541239 3 connected</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329545246 8 connected</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329543242 3 connected 11022-16383</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329546248 2 connected</code>

<code>vars currentEpoch 8 lastVoteEpoch 0</code>

19. 到7001等其他節點中檢視，nodes.conf已經沒有9000的資訊

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 myself,master - 0 0 2 connected 5562-10922</code>

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505329680312 8 connected 0-5561 10923-11021</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505329684319 8 connected</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505329686321 6 connected</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505329685318 5 connected</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505329683317 3 connected 11022-16383</code>

~~~~~~~~~~~~~~~~~~~~~~~~~~~再次添加9000，以及9001~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

20. 将9000和9001再次加入叢集，開始下面的折騰。

注意：需要将9000和9001下的redis.conf外的檔案清除，重新開機。然後才能再次加入叢集。不然會遇到錯誤：

<code>[ERR] Node 172.16.32.116:9001 </code><code>is</code> <code>not</code> <code>empty. Either the node already knows other nodes (</code><code>check</code> <code>with</code> <code>CLUSTER NODES) </code><code>or</code> <code>contains</code> <code>some</code> <code>key</code> <code>in</code> <code>database</code> <code>0.</code>

21. 加入叢集

<code>./redis-trib.rb </code><code>add</code><code>-node 172.16.32.116:9000 172.16.32.116:7002</code>

<code>./redis-trib.rb </code><code>add</code><code>-node 172.16.32.116:9001 172.16.32.116:7002</code>

22. 現在是兩個空的Master節點

<code># ./redis-trib.rb </code><code>check</code> <code>172.16.32.116:9001</code>

<code>>>> Performing Cluster </code><code>Check</code> <code>(using node 172.16.32.116:9001)</code>

23. 重配置設定100個slot到9000上，其實redis很聰明的，我連接配接的是9001，但是在配置設定的時候，它會問你，receiving node是誰，Source node 是誰。

<code># ./redis-trib.rb reshard 172.16.32.116:9001</code>

<code>How many slots do you want </code><code>to</code> <code>move</code> <code>(</code><code>from</code> <code>1 </code><code>to</code> <code>16384)? 100</code>

<code>What </code><code>is</code> <code>the receiving node ID? dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 <<<<<<<<<receiving node ID</code>

<code>Source node #1:aeb684429d220c0fd1392574d193cc1ae7577782 <<<<<<<Source node我選的是 8000</code>

<code>*** The specified node </code><code>is</code> <code>not</code> <code>known </code><code>or</code> <code>is</code> <code>not</code> <code>a master, please retry. <<<<<<<然而，并沒能欺騙redis，它發現了，這個是slave，沒有slot可以提供的。 </code>

<code>Source node #1:273107e5ac994d675749be0979556e761274bb93 <<<<<<<<Source node再次指定為7001，開始配置設定了</code>

<code>Ready </code><code>to</code> <code>move</code> <code>100 slots.</code>

<code> </code><code>Moving slot 5562 </code><code>from</code> <code>273107e5ac994d675749be0979556e761274bb93</code>

<code> </code><code>Moving slot 5563 </code><code>from</code> <code>273107e5ac994d675749be0979556e761274bb93</code>

24. 檢視配置設定情況，redis還是很聰明靈活的。

<code># redis-cli -p 7001 cluster nodes</code>

<code>273107e5ac994d675749be0979556e761274bb93 172.16.32.116:7001 myself,master - 0 0 2 connected 5662-10922</code>

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505330856605 8 connected 0-5561 10923-11021</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505330853598 8 connected</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505330860611 6 connected</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505330859608 5 connected</code>

<code>c4ba7a1f537ac66076791461d6af9012741fee74 172.16.32.116:9001 master - 0 1505330862615 9 connected <<<<<<<<<<<<<<<<<<<<<依然是空的</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505330861612 3 connected 11022-16383</code>

<code>dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 172.16.32.116:9000 master - 0 1505330858607 10 connected 5562-5661 <<<<<<<<<<<<<<<<<<<<<從7001要來100個slot</code>

25. 将9001添加為9000的slave節點 redis-cli -p <slave IP:port> cluster nodes <Master ID 号>

<code># redis-cli -p 9001 cluster nodes dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516</code>

<code>a0b91f48e933c1f1d427c54917ce970bd25d29f8 172.16.32.116:7000 master - 0 1505331457798 8 connected 0-5561 10923-11021</code>

<code>aeb684429d220c0fd1392574d193cc1ae7577782 172.16.32.116:8000 slave a0b91f48e933c1f1d427c54917ce970bd25d29f8 0 1505331454791 8 connected</code>

<code>3d27f60a1cc4d9c8f09aca928b03f0e083722d3b 172.16.32.116:8002 slave 88fe075375295b59eabe69fa1438ed7c7c314f43 0 1505331456795 6 connected</code>

<code>a96cad95dca2a8e1e0302bff4f835260d92e3d31 172.16.32.116:8001 slave 273107e5ac994d675749be0979556e761274bb93 0 1505331458799 10 connected</code>

<code>c4ba7a1f537ac66076791461d6af9012741fee74 172.16.32.116:9001 slave dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 0 1505331459801 10 connected</code>

<code>88fe075375295b59eabe69fa1438ed7c7c314f43 172.16.32.116:7002 master - 0 1505331455793 3 connected 11022-16383</code>

<code>dbf78b73f2ab9e37cbf31abbc2beb3d5413d5516 172.16.32.116:9000 master - 0 1505331453788 10 connected 5562-5661</code>

經過各種折騰，redis添加，删除，重配置設定slot等操作，都測試完了。

中間有很多指令輸出部門，視乎有點重複。但是為了更好的閱讀了解，觀察每一步操作的變化。後面查閱也更容易一些。

畢竟，年紀大了，記性不好。好多自己寫過的blog，回頭翻閱的時候，發現某些步驟，不是很好了解了。雖然我的blog，都是基于自己測試的結果，但是依然會忘記。

本文轉自 hsbxxl 51CTO部落格，原文連結：http://blog.51cto.com/hsbxxl/1965706，如需轉載請自行聯系原作者

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