一、實(shí)驗(yàn)環(huán)境

10年積累的做網(wǎng)站、網(wǎng)站制作經(jīng)驗(yàn)，可以快速應(yīng)對(duì)客戶對(duì)網(wǎng)站的新想法和需求。提供各種問(wèn)題對(duì)應(yīng)的解決方案。讓選擇我們的客戶得到更好、更有力的網(wǎng)絡(luò)服務(wù)。我雖然不認(rèn)識(shí)你，你也不認(rèn)識(shí)我。但先網(wǎng)站設(shè)計(jì)后付款的網(wǎng)站建設(shè)流程，更有古縣免費(fèi)網(wǎng)站建設(shè)讓你可以放心的選擇與我們合作。1、系統(tǒng)版本：?Centos?7.6???x86_64? 2、Redis版本?4.0.9? 3、集群IP信息 172.16.100.201??172.16.100.202??172.16.100.203 4、準(zhǔn)備加入集群的IP信息 172.16.100.204??172.16.100.205??172.16.100.206 5、目的 將Redis集群的3主3從，擴(kuò)容為6主6從，204、205、206?三個(gè)新節(jié)點(diǎn)各新增1主1從！

二、安裝配置Redis集群

1、在3臺(tái)服務(wù)器上安裝redis，每臺(tái)2個(gè)實(shí)例，如下： 172.16.100.201??8000?8001 172.16.100.202??8002?8003 172.16.100.203??8004?8005 開(kāi)始安裝 #tar?xf?redis-4.0.9.tar.gz #cd?redis-4.0.9 #make #mv?redis-4.0.9??/opt/app/redis8000 2、提供配置文件 #cat?/opt/app/redis8000/redis.conf daemonize?yes port?8000 bind?172.16.100.201 appendonly?no save?900?1 save?300?10 save?60?10000000 dir?/opt/app/redis8000/db/ pidfile?/opt/app/redis8000/redis_8000.pid logfile?/opt/app/redis8000/logs/redis8000.log cluster-enabled?yes cluster-config-file?nodes8000.conf cluster-node-timeout?20000 cluster-require-full-coverage?no 3、修改系統(tǒng)參數(shù) #vim??/etc/security/limits.conf? *???soft??????nofile???65535 *???hard??????nofile???65535 *???soft??????nproc????65535 *???hard??????nproc????65535 #vim?/etc/sysctl.conf #redis vm.overcommit_memory=1 net.core.somaxconn?=?511 關(guān)閉大頁(yè)面 #echo?never?>?/sys/kernel/mm/transparent_hugepage/enabled 使配置生效 #sysctl??-p 啟動(dòng)： /opt/app/redis8000/src/redis-server?/opt/app/redis8000/redis.conf? 以上是201服務(wù)器8000節(jié)點(diǎn)配置的例子，202和203服務(wù)器2個(gè)節(jié)點(diǎn)配置，參考上面即可，注意監(jiān)聽(tīng)ip地址和端口、路徑名稱需要作出相應(yīng)的修改。

三、創(chuàng)建Redis 4.0.9 集群（在201服務(wù)器操作即可）

1、安裝軟件包 #yum?install?ruby?rubygems?-y #gem?install?redis?-v?3.3.5 2、創(chuàng)建集群 #/opt/app/redis8000/src/redis-trib.rb?create?--replicas?1?172.16.100.201:8000?172.16.100.201:8001?172.16.100.202:8002?172.16.100.202:8003?172.16.100.203:8004?172.16.100.203:8005 3、查看集群IP信息 172.16.100.203:8005?slave 172.16.100.201:8001?slave? 172.16.100.203:8004?master????10923-16383 172.16.100.202:8003?slave? 172.16.100.201:8000?master????0-5460? 172.16.100.202:8002?master????5461-10922 將線上對(duì)應(yīng)3主3從Redis集群slot的dump.rdb拷貝到對(duì)應(yīng)節(jié)點(diǎn)，并啟動(dòng)，目的是讓實(shí)驗(yàn)環(huán)境Redis集群有數(shù)據(jù)，或者自己造一些數(shù)據(jù)，此步驟省略！為了演示效果，我 這里手動(dòng)set幾個(gè)key，如下： 172.16.100.201:8000>?set?name1?jodan ………… 172.16.100.201:8000>?set?name10?kawayi …………

四、將新節(jié)點(diǎn)加入集群并遷移slot(在172.16.100.201服務(wù)器操作)

注:在204、205、206各啟動(dòng)2個(gè)redis實(shí)例，端口如下分配： 204??master?8006??slave??8007 205??master?8008??slave??8009 206??master?8010??slave??8011 1、配置啟動(dòng)新服務(wù)器Redis(一共3臺(tái)服務(wù)器6個(gè)redis實(shí)例)，配置方法參考步驟二，這里不再贅述。 2、將3個(gè)master節(jié)點(diǎn)加入集群 原集群詳細(xì)信息：??3主3從 #?/opt/app/redis8000/src/redis-cli??-h?172.16.100.201?-p?8000??cluster?nodes 11ae0bcc3aeae0cb7e40c28f407e3d2a30504989?172.16.100.202:8002@18002?master?-?0?1575702279000?3?connected?5461-10922 b87a9f751b1eb4496c2eff495d216c88c22065ac?172.16.100.203:8004@18004?master?-?0?1575702277798?5?connected?10923-16383 95ccd1953fa78a1ffa599d65b72d547f8277c3b5?172.16.100.201:8001@18001?slave?b87a9f751b1eb4496c2eff495d216c88c22065ac?0?1575702279804?5?connected 2c67f0832908ae6375fec57b2399a0a8f4c9e9cc?172.16.100.203:8005@18005?slave?11ae0bcc3aeae0cb7e40c28f407e3d2a30504989?0?1575702279000?6?connected 9a02a2120d4a0f9bd8b3ae7e11ffe28d0e03d6fc?172.16.100.201:8000@18000?myself,master?-?0?1575702278000?1?connected?0-5460 187eba647c002ff47674c71225c428fb8db59444?172.16.100.202:8003@18003?slave?9a02a2120d4a0f9bd8b3ae7e11ffe28d0e03d6fc?0?1575702276795?4?connected 將172.16.100.204:8006?加入集群， /opt/app/redis8000/src/redis-trib.rb?add-node?172.16.100.204:8006?172.16.100.201:8000 將172.16.100.205:8008?加入集群 /opt/app/redis8000/src/redis-trib.rb?add-node?172.16.100.205:8008?172.16.100.201:8000 將172.16.100.206:8010?加入集群 /opt/app/redis8000/src/redis-trib.rb?add-node?172.16.100.206:8010?172.16.100.201:8000 查看加入3個(gè)master節(jié)點(diǎn)之后的集群信息： #/opt/app/redis8000/src/redis-cli??-h?172.16.100.201?-p?8000??cluster?nodes??????????? 11ae0bcc3aeae0cb7e40c28f407e3d2a30504989?172.16.100.202:8002@18002?master?-?0?1575704459051?3?connected?5461-10922 95ccd1953fa78a1ffa599d65b72d547f8277c3b5?172.16.100.201:8001@18001?slave?b87a9f751b1eb4496c2eff495d216c88c22065ac?0?1575704457045?5?connected 187eba647c002ff47674c71225c428fb8db59444?172.16.100.202:8003@18003?slave?9a02a2120d4a0f9bd8b3ae7e11ffe28d0e03d6fc?0?1575704457000?4?connected 9a02a2120d4a0f9bd8b3ae7e11ffe28d0e03d6fc?172.16.100.201:8000@18000?myself,master?-?0?1575704458000?1?connected?0-5460 c4772e933405eda022b0f7b837a67f05690c76da?172.16.100.204:8006@18006?master?-?0?1575704458048?0?connected??? 564d7877350b0a4789f18162c393a04584f9d311?172.16.100.205:8008@18008?master?-?0?1575704455000?7?connected b87a9f751b1eb4496c2eff495d216c88c22065ac?172.16.100.203:8004@18004?master?-?0?1575704455040?5?connected?10923-16383 3dc917e0d7a1387caf646add2d06814cdb3560ab?172.16.100.206:8010@18010?master?-?0?1575704458548?0?connected 2c67f0832908ae6375fec57b2399a0a8f4c9e9cc?172.16.100.203:8005@18005?slave?11ae0bcc3aeae0cb7e40c28f407e3d2a30504989?0?1575704457000?6?connected 可以看到新加入集群的節(jié)點(diǎn)是沒(méi)有slot的，所以下面就需要將其他3個(gè)master節(jié)點(diǎn)的部分slot遷移過(guò)去。 3、開(kāi)始slot自動(dòng)遷移 #ruby?/opt/app/redis8000/src/redis-trib.rb?rebalance?--auto-weights?--use-empty-masters?172.16.100.201:8000 >>>?Performing?Cluster?Check?(using?node?172.16.100.201:8000) [OK]?All?nodes?agree?about?slots?configuration. >>>?Check?for?open?slots... >>>?Check?slots?coverage... [OK]?All?16384?slots?covered. >>>?Rebalancing?across?6?nodes.?Total?weight?=?6 Moving?2732?slots?from?172.16.100.202:8002?to?172.16.100.204:8006 #################???花費(fèi)時(shí)間長(zhǎng)短根據(jù)遷移數(shù)據(jù)量大小 Moving?2731?slots?from?172.16.100.203:8004?to?172.16.100.206:8010 ################# Moving?2731?slots?from?172.16.100.201:8000?to?172.16.100.205:8008 ################# 結(jié)束之后，再次查看集群信息： #?/opt/app/redis8000/src/redis-cli??-h?172.16.100.201?-p?8000??cluster?nodes???????????????????????????????? 11ae0bcc3aeae0cb7e40c28f407e3d2a30504989?172.16.100.202:8002@18002?master?-?0?1575706557000?3?connected?8193-10922 95ccd1953fa78a1ffa599d65b72d547f8277c3b5?172.16.100.201:8001@18001?slave?b87a9f751b1eb4496c2eff495d216c88c22065ac?0?1575706557000?5?connected 187eba647c002ff47674c71225c428fb8db59444?172.16.100.202:8003@18003?slave?9a02a2120d4a0f9bd8b3ae7e11ffe28d0e03d6fc?0?1575706554000?4?connected 9a02a2120d4a0f9bd8b3ae7e11ffe28d0e03d6fc?172.16.100.201:8000@18000?myself,master?-?0?1575706555000?1?connected?2731-5460 c4772e933405eda022b0f7b837a67f05690c76da?172.16.100.204:8006@18006?master?-?0?1575706558000?9?connected?5461-8192 564d7877350b0a4789f18162c393a04584f9d311?172.16.100.205:8008@18008?master?-?0?1575706557237?11?connected?0-2730 b87a9f751b1eb4496c2eff495d216c88c22065ac?172.16.100.203:8004@18004?master?-?0?1575706556000?5?connected?13654-16383 3dc917e0d7a1387caf646add2d06814cdb3560ab?172.16.100.206:8010@18010?master?-?0?1575706559243?10?connected?10923-13653 2c67f0832908ae6375fec57b2399a0a8f4c9e9cc?172.16.100.203:8005@18005?slave?11ae0bcc3aeae0cb7e40c28f407e3d2a30504989?0?1575706558240?6?connected 可以看出新加入集群的3個(gè)master節(jié)點(diǎn)已經(jīng)有slot了。 查看前面手動(dòng)加的key是否成功遷移到了新master節(jié)點(diǎn)，如下： 172.16.100.201:8000>?get?name1 ->?Redirected?to?slot?[12933]?located?at?172.16.100.206:8010????#新節(jié)點(diǎn) "jodan" 172.16.100.206:8010>?get?name2 ->?Redirected?to?slot?[742]?located?at?172.16.100.205:8008??????#新節(jié)點(diǎn) "kobe" 172.16.100.205:8008>?get?name3 ->?Redirected?to?slot?[4807]?located?at?172.16.100.201:8000 "onier" 172.16.100.201:8000>?get?name4 ->?Redirected?to?slot?[8736]?located?at?172.16.100.202:8002 "curry" 172.16.100.202:8002>?get?name5 ->?Redirected?to?slot?[12801]?located?at?172.16.100.206:8010????#新節(jié)點(diǎn) "james" 172.16.100.206:8010>?get?name6 ->?Redirected?to?slot?[610]?located?at?172.16.100.205:8008??????#新節(jié)點(diǎn) "durant" 172.16.100.205:8008>?get?name7 ->?Redirected?to?slot?[4675]?located?at?172.16.100.201:8000 "timu" 172.16.100.201:8000>?get?name8 ->?Redirected?to?slot?[9132]?located?at?172.16.100.202:8002 "park" 172.16.100.202:8002>?get?name9 ->?Redirected?to?slot?[13197]?located?at?172.16.100.206:8010?????#新節(jié)點(diǎn) "qiaozhi"?? 可以看到有幾個(gè)key已經(jīng)成功遷移到了新節(jié)點(diǎn)205和206！ 4、為新master節(jié)點(diǎn)添加slave節(jié)點(diǎn)(在172.16.100.201節(jié)點(diǎn)操作) 為了避免單點(diǎn)故障，設(shè)計(jì)主從如下： 204??????????????205?????????????206 8006?M1?????????8008?M2??????????8010?M3 8007?S3?????????8009?S1??????????8011?S2 將205@8009這個(gè)節(jié)點(diǎn)加為?204@8006?的從節(jié)點(diǎn) /opt/app/redis8000/src/redis-trib.rb?add-node?--slave?--master-id?c4772e933405eda022b0f7b837a67f05690c76da?172.16.100.205:8009?172.16.100.204:8006 將206@8011這個(gè)節(jié)點(diǎn)加為?205@8008?的從節(jié)點(diǎn) /opt/app/redis8000/src/redis-trib.rb?add-node?--slave?--master-id?564d7877350b0a4789f18162c393a04584f9d311?172.16.100.206:8011?172.16.100.205:8008 將204@8007這個(gè)節(jié)點(diǎn)加為?206@8010?的從節(jié)點(diǎn) /opt/app/redis8000/src/redis-trib.rb?add-node?--slave?--master-id?3dc917e0d7a1387caf646add2d06814cdb3560ab?172.16.100.204:8007?172.16.100.206:8010 再次查看集群信息如下： #/opt/app/redis8000/src/redis-cli??-h?172.16.100.201?-p?8000??cluster?nodes 11ae0bcc3aeae0cb7e40c28f407e3d2a30504989?172.16.100.202:8002@18002?master?-?0?1575708808057?3?connected?8193-10922 1d7c87447dd419ac7a2260dce726af03e7965c1a?172.16.100.204:8007@18007?slave?3dc917e0d7a1387caf646add2d06814cdb3560ab?0?1575708799027?10?connected 95ccd1953fa78a1ffa599d65b72d547f8277c3b5?172.16.100.201:8001@18001?slave?b87a9f751b1eb4496c2eff495d216c88c22065ac?0?1575708807000?5?connected 187eba647c002ff47674c71225c428fb8db59444?172.16.100.202:8003@18003?slave?9a02a2120d4a0f9bd8b3ae7e11ffe28d0e03d6fc?0?1575708806049?4?connected 9a02a2120d4a0f9bd8b3ae7e11ffe28d0e03d6fc?172.16.100.201:8000@18000?myself,master?-?0?1575708806000?1?connected?2731-5460 c4772e933405eda022b0f7b837a67f05690c76da?172.16.100.204:8006@18006?master?-?0?1575708803000?9?connected?5461-8192 564d7877350b0a4789f18162c393a04584f9d311?172.16.100.205:8008@18008?master?-?0?1575708801000?11?connected?0-2730 735012e7c6f181f7e8a197fc1667ff7bc075361d?172.16.100.206:8011@18011?slave?564d7877350b0a4789f18162c393a04584f9d311?0?1575708807054?11?connected b87a9f751b1eb4496c2eff495d216c88c22065ac?172.16.100.203:8004@18004?master?-?0?1575708805047?5?connected?13654-16383 5ba06662b9b260ca2cadcf2f7692e5e0e1a91474?172.16.100.205:8009@18009?slave?c4772e933405eda022b0f7b837a67f05690c76da?0?1575708804045?9?connected 3dc917e0d7a1387caf646add2d06814cdb3560ab?172.16.100.206:8010@18010?master?-?0?1575708805000?10?connected?10923-13653 2c67f0832908ae6375fec57b2399a0a8f4c9e9cc?172.16.100.203:8005@18005?slave?11ae0bcc3aeae0cb7e40c28f407e3d2a30504989?0?1575708806000?6?connected 遷移結(jié)束！??！

不足之處，請(qǐng)多多交流指出。

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