系统运维
一、实验环境
1、系统版本：?Centos?7.6?x86_64? 2、Redis版本?4.0.9? 3、集群IP信息 172.16.100.201172.16.100.202172.16.100.203 4、准备加入集群的IP信息 172.16.100.204172.16.100.205172.16.100.206 5、目的 将Redis集群的3主3从，扩容为6主6从，204、205、206?三个新节点各新增1主1从！
二、安装配置Redis集群
1、在3台服务器上安装redis，每台2个实例，如下： 172.16.100.2018000?8001 172.16.100.2028002?8003 172.16.100.2038004?8005 开始安装 #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、修改系统参数 #vim/etc/security/limits.conf? *?softnofile?65535 *?hardnofile?65535 *?softnproc65535 *?hardnproc65535 #vim?/etc/sysctl.conf #redis vm.overcommit_memory=1 net.core.somaxconn?=?511 关闭大页面 #echo?never?>?/sys/kernel/mm/transparent_hugepage/enabled 使配置生效 #sysctl-p 启动： /opt/app/redis8000/src/redis-server?/opt/app/redis8000/redis.conf? 以上是201服务器8000节点配置的例子，202和203服务器2个节点配置，参考上面即可，注意监听ip地址和端口、路径名称需要作出相应的修改。
三、创建Redis 4.0.9 集群（在201服务器操作即可）
1、安装软件包 #yum?install?ruby?rubygems?-y #gem?install?redis?-v?3.3.5 2、创建集群 #/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?master10923-16383 172.16.100.202:8003?slave? 172.16.100.201:8000?master0-5460? 172.16.100.202:8002?master5461-10922 将线上对应3主3从Redis集群slot的dump.rdb拷贝到对应节点，并启动，目的是让实验环境Redis集群有数据，或者自己造一些数据，此步骤省略！为了演示效果，我 这里手动set几个key，如下： 172.16.100.201:8000>?set?name1?jodan ………… 172.16.100.201:8000>?set?name10?kawayi …………
四、将新节点加入集群并迁移slot(在172.16.100.201服务器操作)
注:在204、205、206各启动2个redis实例，端口如下分配： 204master?8006slave8007 205master?8008slave8009 206master?8010slave8011 1、配置启动新服务器Redis(一共3台服务器6个redis实例)，配置方法参考步骤二，这里不再赘述。 2、将3个master节点加入集群 原集群详细信息：3主3从 #?/opt/app/redis8000/src/redis-cli-h?172.16.100.201?-p?8000cluster?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 将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 将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 将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个master节点之后的集群信息： #/opt/app/redis8000/src/redis-cli-h?172.16.100.201?-p?8000cluster?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节点是没有slot的，所以下面就需要将其他3个master节点的部分slot迁移过去。 3、开始slot自动迁移 #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 #################?花费时间长短根据迁移数据量大小 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 ################# 结束之后，再次查看集群信息： #?/opt/app/redis8000/src/redis-cli-h?172.16.100.201?-p?8000cluster?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个master节点已经有slot了。 查看前面手动加的key是否成功迁移到了新master节点，如下： 172.16.100.201:8000>?get?name1 ->?Redirected?to?slot?[12933]?located?at?172.16.100.206:8010#新节点 jodan 172.16.100.206:8010>?get?name2 ->?Redirected?to?slot?[742]?located?at?172.16.100.205:8008#新节点 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#新节点 james 172.16.100.206:8010>?get?name6 ->?Redirected?to?slot?[610]?located?at?172.16.100.205:8008#新节点 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?#新节点 qiaozhi 可以看到有几个key已经成功迁移到了新节点205和206！ 4、为新master节点添加slave节点(在172.16.100.201节点操作) 为了避免单点故障，设计主从如下： 204205?206 8006?M1?8008?M28010?M3 8007?S3?8009?S18011?S2 将205@8009这个节点加为?204@8006?的从节点 /opt/app/redis8000/src/redis-trib.rb?add-node?--slave?--master-id?c4772e933405eda022b0f7b837a67f05690c76da?172.16.100.205:8009?172.16.100.204:8006 将206@8011这个节点加为?205@8008?的从节点 /opt/app/redis8000/src/redis-trib.rb?add-node?--slave?--master-id?564d7877350b0a4789f18162c393a04584f9d311?172.16.100.206:8011?172.16.100.205:8008 将204@8007这个节点加为?206@8010?的从节点 /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?8000cluster?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 迁移结束！！！
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