在上一篇介紹了Redis Cluster的部署實戰(zhàn)《Redis Cluster 集群部署實戰(zhàn)》
目前創(chuàng)新互聯(lián)建站已為成百上千的企業(yè)提供了網(wǎng)站建設(shè)、域名、雅安服務(wù)器托管、綿陽服務(wù)器托管、企業(yè)網(wǎng)站設(shè)計、余姚網(wǎng)站維護(hù)等服務(wù)，公司將堅持客戶導(dǎo)向、應(yīng)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(xié)力一起成長，共同發(fā)展。若因業(yè)務(wù)無法支撐現(xiàn)有訪問或?qū)σ院笕萘窟M(jìn)行擴(kuò)容預(yù)案，如何擴(kuò)容？可以提前做好快速擴(kuò)容的腳本，進(jìn)行一鍵擴(kuò)容或是手工進(jìn)行擴(kuò)容
這里是手工進(jìn)行擴(kuò)容
背景：
假設(shè)因業(yè)務(wù)快速增長需要，現(xiàn)上面的Redis集群已經(jīng)無法滿足支撐業(yè)務(wù)系統(tǒng)，先需要快速擴(kuò)容Redis集群，這里假設(shè)只擴(kuò)容一臺Redis（兩個實例）
擴(kuò)容清單：
主機(jī)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(jī)的hosts就不配置了，若是自建DNS，則內(nèi)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(fā)現(xiàn)172.20.20.174是沒有分配slot的，那如何給174主機(jī)分配slot呢？
在標(biāo)注紅色的有Master字樣的機(jī)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(kuò)容成功，看看各個實例的分配情況
這里有數(shù)據(jù)量不相等的情況，因為我在171的node上還在批量插入數(shù)據(jù)
當(dāng)然擴(kuò)容的反方案，之后就是縮容，一般對抗突發(fā)流量之后需要縮容，正常的數(shù)據(jù)量增長是不要縮容的，另外縮容也是有一定風(fēng)險存在的
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