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接上一节#xff0c;在当前机器为4主4从的架构上#xff0c;减缩容量为3主3从架构。即实现删除6387和6388. 示意图如下#xff1a; 第一步#xff1a;查看集群情况#xff08;第一次#xff09;
redis-cli --cluster check 127.0.0.1:6387roo…实现集群主从缩容【4/4】
接上一节在当前机器为4主4从的架构上减缩容量为3主3从架构。即实现删除6387和6388. 示意图如下 第一步查看集群情况第一次
redis-cli --cluster check 127.0.0.1:6387rootlocalhost:/data# redis-cli --cluster check 127.0.0.1:6387
127.0.0.1:6387 (bf73145e...) - 1 keys | 4096 slots | 1 slaves.
122.114.161.116:6381 (6e961a47...) - 1 keys | 4096 slots | 1 slaves.
122.114.161.116:6383 (78ac7be1...) - 1 keys | 4096 slots | 1 slaves.
122.114.161.116:6382 (f097fec9...) - 1 keys | 4096 slots | 1 slaves.
[OK] 4 keys in 4 masters.
0.00 keys per slot on average.Performing Cluster Check (using node 127.0.0.1:6387)
M: bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 127.0.0.1:6387slots:[0-1364],[5461-6826],[10923-12287] (4096 slots) master1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 12.114.161.16:6386slots: (0 slots) slavereplicates 6e961a4765b555189708bebb69badf7dfad25cd5
S: 664e456ae7d5cf27ea6583ba2f437dac11d4e767 12.114.161.16:6388slots: (0 slots) slavereplicates bf73145e2eaaaa08084c9c2dad0d8c757faa48e1
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 12.114.161.16:6385slots: (0 slots) slavereplicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
M: 6e961a4765b555189708bebb69badf7dfad25cd5 12.114.161.16:6381slots:[1365-5460] (4096 slots) master1 additional replica(s)
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 12.114.161.16:6384slots: (0 slots) slavereplicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 12.114.161.16:6383slots:[12288-16383] (4096 slots) master1 additional replica(s)
M: f097fec937f54d147d316c1c62e26cb67c9fd059 12.114.161.16:6382slots:[6827-10922] (4096 slots) master1 additional replica(s)
[OK] All nodes agree about slots configuration.Check for open slots...Check slots coverage...
[OK] All 16384 slots covered.第二步删除从主机6388,删除参数【--cluster del-node】
redis-cli --cluster del-node 12.114.161.16:6388 664e456ae7d5cf27ea6583ba2f437dac11d4e767rootlocalhost:/data# redis-cli --cluster del-node 12.114.161.16:6388 664e456ae7d5cf27ea6583ba2f437dac11d4e767Removing node 664e456ae7d5cf27ea6583ba2f437dac11d4e767 from cluster 12.114.161.16:6388Sending CLUSTER FORGET messages to the cluster...Sending CLUSTER RESET SOFT to the deleted node.第三步查看集群情况第二次
redis-cli --cluster check 127.0.0.1:6387略。。。第四步将该主机的槽位分给6381主机【--cluster reshard】
redis-cli --cluster reshard 12.114.161.16:6381rootlocalhost:/data# redis-cli --cluster reshard 12.114.161.16:6381Performing Cluster Check (using node 12.114.161.16:6381)
M: 6e961a4765b555189708bebb69badf7dfad25cd5 12.114.161.16:6381slots:[0-6826],[10923-12287] (8192 slots) master1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 12.114.161.16:6386slots: (0 slots) slavereplicates 6e961a4765b555189708bebb69badf7dfad25cd5
M: bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 12.114.161.16:6387slots: (0 slots) master
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 12.114.161.16:6385slots: (0 slots) slavereplicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 12.114.161.16:6384slots: (0 slots) slavereplicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: f097fec937f54d147d316c1c62e26cb67c9fd059 12.114.161.16:6382slots:[6827-10922] (4096 slots) master1 additional replica(s)
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 12.114.161.16:6383slots:[12288-16383] (4096 slots) master1 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)? 4096 # 移除多少槽位数
What is the receiving node ID? 6e961a4765b555189708bebb69badf7dfad25cd5 # 分给哪一台master 主机ID
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: bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 # 从哪一台主机移除的槽位 主机ID
Source node #2: done # 输入done即可 后面提示 直接输入‘yes’即可
...
....第五步查看集群情况第三次确定需要移除主机的槽位数为0
redis-cli --cluster check 127.0.0.1:6387rootlocalhost:/data# redis-cli --cluster check 122.114.161.116:6381
122.114.161.116:6381 (6e961a47...) - 2 keys | 8192 slots | 1 slaves. # 此处显示加上移除来的4096个槽位总共有8192个槽位。转移成功
122.114.161.116:6387 (bf73145e...) - 0 keys | 0 slots | 0 slaves. # 此次显示原来4096个槽位已经移除显示为 0
122.114.161.116:6382 (f097fec9...) - 1 keys | 4096 slots | 1 slaves.
122.114.161.116:6383 (78ac7be1...) - 1 keys | 4096 slots | 1 slaves.
[OK] 4 keys in 4 masters. # 显示总共4台master主机
0.00 keys per slot on average.Performing Cluster Check (using node 122.114.161.116:6381)
M: 6e961a4765b555189708bebb69badf7dfad25cd5 122.114.161.116:6381slots:[0-6826],[10923-12287] (8192 slots) master1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 122.114.161.116:6386slots: (0 slots) slavereplicates 6e961a4765b555189708bebb69badf7dfad25cd5
M: bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 122.114.161.116:6387slots: (0 slots) master # 此次显示原来Master主机的 4096个槽位已经移除显示为 0
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 122.114.161.116:6385slots: (0 slots) slavereplicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 122.114.161.116:6384slots: (0 slots) slavereplicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: f097fec937f54d147d316c1c62e26cb67c9fd059 122.114.161.116:6382slots:[6827-10922] (4096 slots) master1 additional replica(s)
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 122.114.161.116:6383slots:[12288-16383] (4096 slots) master1 additional replica(s)
[OK] All nodes agree about slots configuration.Check for open slots...Check slots coverage...
[OK] All 16384 slots covered.根据上面的数据显示槽位已经转移成功 【注意如果想将4096个槽位平均分给另外三台master主机那么需要重复该操作三次分别输入不同的目标ID即可】
第六步删除master主机6387,删除参数【--cluster del-node】
redis-cli --cluster del-node 12.114.161.16:6387 bf73145e2eaaaa08084c9c2dad0d8c757faa48e1rootlocalhost:/data# redis-cli --cluster del-node 122.114.161.116:6381 bf73145e2eaaaa08084c9c2dad0d8c757faa48e1Removing node bf73145e2eaaaa08084c9c2dad0d8c757faa48e1 from cluster 122.114.161.116:6381Sending CLUSTER FORGET messages to the cluster...Sending CLUSTER RESET SOFT to the deleted node.第七步查看最终的集群情况第四次
redis-cli --cluster check 127.0.0.1:6387rootlocalhost:/data#
rootlocalhost:/data#
rootlocalhost:/data# redis-cli --cluster check 122.114.161.116:6381
122.114.161.116:6381 (6e961a47...) - 2 keys | 8192 slots | 1 slaves. # 该列表不在显示6387端口的master主机了
122.114.161.116:6382 (f097fec9...) - 1 keys | 4096 slots | 1 slaves.
122.114.161.116:6383 (78ac7be1...) - 1 keys | 4096 slots | 1 slaves.
[OK] 4 keys in 3 masters. # 此次仅仅剩下3台Master主机
0.00 keys per slot on average.Performing Cluster Check (using node 122.114.161.116:6381)
M: 6e961a4765b555189708bebb69badf7dfad25cd5 122.114.161.116:6381slots:[0-6826],[10923-12287] (8192 slots) master1 additional replica(s)
S: 4ed46e0368698cd9d5af2ee84631c878b8ebc4d0 122.114.161.116:6386slots: (0 slots) slavereplicates 6e961a4765b555189708bebb69badf7dfad25cd5
S: 9bc2417a9cd6545ef2445eb4aa0610d586acd73b 122.114.161.116:6385slots: (0 slots) slavereplicates 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2
S: 0e34147ce2544cd90f5cce78d5493ae9e8625dfe 122.114.161.116:6384slots: (0 slots) slavereplicates f097fec937f54d147d316c1c62e26cb67c9fd059
M: f097fec937f54d147d316c1c62e26cb67c9fd059 122.114.161.116:6382slots:[6827-10922] (4096 slots) master1 additional replica(s)
M: 78ac7be13522bd4ffd6fcf900c6c149c6938ecc2 122.114.161.116:6383slots:[12288-16383] (4096 slots) master1 additional replica(s)
[OK] All nodes agree about slots configuration.Check for open slots...Check slots coverage...
[OK] All 16384 slots covered.至此成功将原来的“4主4从架构”缩容成“3主3从架构”
