在上一篇介紹了Redis Cluster的部署實戰《Redis Cluster 集群部署實戰》

目前創新互聯建站已為成百上千的企業提供了網站建設、域名、雅安服務器托管、綿陽服務器托管、企業網站設計、余姚網站維護等服務，公司將堅持客戶導向、應用為本的策略，正道將秉承"和諧、參與、激情"的文化，與客戶和合作伙伴齊心協力一起成長，共同發展。

若因業務無法支撐現有訪問或對以后容量進行擴容預案，如何擴容？可以提前做好快速擴容的腳本，進行一鍵擴容或是手工進行擴容

這里是手工進行擴容

背景：

假設因業務快速增長需要，現上面的Redis集群已經無法滿足支撐業務系統，先需要快速擴容Redis集群，這里假設只擴容一臺Redis（兩個實例）

擴容清單：

主機名	IP地址	Redis端口劃分	備注
node174	172.20.20.174	16001,16002

說明：這里的各個主機的hosts就不配置了，若是自建DNS，則內部解析需要配置

Redis部署略

參見上面的鏈接，另外可以將打成鏡像，修改IP地址即可

/opt/redis/bin/redis-server /opt/redis/conf/redis-16001.conf

/opt/redis/bin/redis-server /opt/redis/conf/redis-16002.conf

./bin/redis-cli ?--cluster add-node 172.20.20.174:16001 172.20.20.171:16001

Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.

>>> Adding node 172.20.20.174:16001 to cluster 172.20.20.171:16001

>>> Performing Cluster Check (using node 172.20.20.171:16001)

S: a9ab7a12884d505efcf066fcc3aae74c2b3f101d 172.20.20.171:16001

slots: (0 slots) slave

replicates 6dec89e63a48a9a9f393011a698a0bda21b70f1e

M: 6dec89e63a48a9a9f393011a698a0bda21b70f1e 172.20.20.172:16002

slots:[0-5460] (5461 slots) master

1 additional replica(s)

M: 04d9c29ef2569b1fc8abd9594d64fca33e4ad4f2 172.20.20.173:16001

slots:[10923-16383] (5461 slots) master

1 additional replica(s)

M: 761348a0107f5b009cabc22c214e39578d0aa707 172.20.20.172:16001

slots:[5461-10922] (5462 slots) master

1 additional replica(s)

S: 81d1b25ae1ea85421bd4abb2be094c258026c505 172.20.20.171:16002

slots: (0 slots) slave

replicates 04d9c29ef2569b1fc8abd9594d64fca33e4ad4f2

S: 14e79155f78065e4518e00cd5bd057336b17e3a7 172.20.20.173:16002

slots: (0 slots) slave

replicates 761348a0107f5b009cabc22c214e39578d0aa707

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

>>> Send CLUSTER MEET to node 172.20.20.174:16001 to make it join the cluster.

[OK] New node added correctly.

登陸171--173中的任意一臺查看

[root@node172 redis]# ./bin/redis-cli ?-h 172.20.20.172 -p 16002

172.20.20.172:16002> auth zjkj

OK

172.20.20.172:16002> cluster nodes

761348a0107f5b009cabc22c214e39578d0aa707 172.20.20.172:16001@26001 master - 0 1564038119398 3 connected 5461-10922

ea77d7d10c27a1d99de00f4f81034d2d82a3c765 172.20.20.174:16001@26001 master - 0 1564038119000 0 connected

6dec89e63a48a9a9f393011a698a0bda21b70f1e 172.20.20.172:16002@26002?myself,master?- 0 1564038120000 7 connected 0-5460

a9ab7a12884d505efcf066fcc3aae74c2b3f101d 172.20.20.171:16001@26001 slave 6dec89e63a48a9a9f393011a698a0bda21b70f1e 0 1564038121413 7 connected

04d9c29ef2569b1fc8abd9594d64fca33e4ad4f2 172.20.20.173:16001@26001 master - 0 1564038118396 5 connected 10923-16383

81d1b25ae1ea85421bd4abb2be094c258026c505 172.20.20.171:16002@26002 slave 04d9c29ef2569b1fc8abd9594d64fca33e4ad4f2 0 1564038118000 5 connected

14e79155f78065e4518e00cd5bd057336b17e3a7 172.20.20.173:16002@26002 slave 761348a0107f5b009cabc22c214e39578d0aa707 0 1564038120405 6 connected

發現172.20.20.174是沒有分配slot的，那如何給174主機分配slot呢？

在標注紅色的有Master字樣的機器上，登陸任意一臺master，給174分配slot

[root@node174 redis]# ./bin/redis-cli ?--cluster reshard 172.20.20.171:16001 -a zjkj

Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.

>>> Performing Cluster Check (using node 172.20.20.172:16002)

M: 6dec89e63a48a9a9f393011a698a0bda21b70f1e 172.20.20.172:16002

slots:[0-5460] (5461 slots) master

1 additional replica(s)

M: 761348a0107f5b009cabc22c214e39578d0aa707 172.20.20.172:16001

slots:[5461-10922] (5462 slots) master

1 additional replica(s)

M: ea77d7d10c27a1d99de00f4f81034d2d82a3c765?172.20.20.174:16001

slots: (0 slots) master

S: a9ab7a12884d505efcf066fcc3aae74c2b3f101d 172.20.20.171:16001

slots: (0 slots) slave

replicates 6dec89e63a48a9a9f393011a698a0bda21b70f1e

M: 04d9c29ef2569b1fc8abd9594d64fca33e4ad4f2 172.20.20.173:16001

slots:[10923-16383] (5461 slots) master

1 additional replica(s)

S: 81d1b25ae1ea85421bd4abb2be094c258026c505 172.20.20.171:16002

slots: (0 slots) slave

replicates 04d9c29ef2569b1fc8abd9594d64fca33e4ad4f2

S: 14e79155f78065e4518e00cd5bd057336b17e3a7 172.20.20.173:16002

slots: (0 slots) slave

replicates 761348a0107f5b009cabc22c214e39578d0aa707

[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)?

How many slots do you want to move (from 1 to 16384)? 4096

What is the receiving node ID? ea77d7d10c27a1d99de00f4f81034d2d82a3c765?#新添加的主庫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: all

shell>./bin/redis-cli ?-h 172.20.20.174 -p 16002-a zjkj

172.20.20.174:16002> cluster replicate ea77d7d10c27a1d99de00f4f81034d2d82a3c765? #這里的Id是 #新庫ID

172.20.20.174:16002> cluster nodes

761348a0107f5b009cabc22c214e39578d0aa707 172.20.20.172:16001@26001 master - 0 1564039099770 3 connected 6827-10922

a9ab7a12884d505efcf066fcc3aae74c2b3f101d 172.20.20.171:16001@26001 slave 6dec89e63a48a9a9f393011a698a0bda21b70f1e 0 1564039096756 7 connected

14e79155f78065e4518e00cd5bd057336b17e3a7 172.20.20.173:16002@26002 slave 761348a0107f5b009cabc22c214e39578d0aa707 0 1564039097762 3 connected

6dec89e63a48a9a9f393011a698a0bda21b70f1e 172.20.20.172:16002@26002 master - 0 1564039098764 7 connected 1365-5460

04d9c29ef2569b1fc8abd9594d64fca33e4ad4f2 172.20.20.173:16001@26001 master - 0 1564039097000 5 connected 12288-16383

81d1b25ae1ea85421bd4abb2be094c258026c505 172.20.20.171:16002@26002 slave 04d9c29ef2569b1fc8abd9594d64fca33e4ad4f2 0 1564039099000 5 connected

7d697261f0a4dd31f422e2fbe593d5cdd575fbb5 172.20.20.174:16002@26002 myself,slave ea77d7d10c27a1d99de00f4f81034d2d82a3c765 0 1564039094000 0 connected

ea77d7d10c27a1d99de00f4f81034d2d82a3c765 172.20.20.174:16001@26001 master - 0 1564039097000 8 connected 0-1364 5461-6826 10923-12287

至此擴容成功，看看各個實例的分配情況

這里有數據量不相等的情況，因為我在171的node上還在批量插入數據

當然擴容的反方案，之后就是縮容，一般對抗突發流量之后需要縮容，正常的數據量增長是不要縮容的，另外縮容也是有一定風險存在的

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