- 多個redis節點網絡互聯,數據共享
- 全部的節點都是一主一從(能夠是多個從),其中從不提供服務,僅做爲備用
- 不支持同時處理多個鍵(如mset/mget),由於redis須要把鍵均勻分佈在各個節點上,併發量很高的狀況下同時建立鍵值會下降性能並致使不可預測的行爲。
- 支持在線增長、刪除節點
- 客戶端能夠連任何一個主節點進行讀寫
唉過年過崩了node
大白話:linux
數據量很大,多臺機器組成大集羣,解決存儲空間、查詢速度負載高的瓶頸問題,Redis 上面的數據是共享式的,也就是A server有的B server不必定有。相似於Raid 5,寫入數據多是A磁盤 多是B磁盤。你能夠正常讀取,但真正的存儲位置須要查詢nginx
master(IP:192.168.8.131)啓動三個端口:git
[root@root ~]# vim /etc/redis_7000.conf port 7000 bind 192.168.8.131 daemonize yes pidfile /var/run/redis_7000.pid dir /data/redis_data/7000 cluster-enabled yes ##開啓cluster功能 cluster-config-file nodes_7000.conf ##該配置文件能夠在dir目錄下自動生成 cluster-node-timeout 10100 appendonly yes [root@root ~]# vim /etc/redis_7002.conf port 7002 bind 192.168.8.131 daemonize yes pidfile /var/run/redis_7002.pid dir /data/redis_data/7002 cluster-enabled yes cluster-config-file nodes_7002.conf cluster-node-timeout 10100 appendonly yes [root@root ~]# vim /etc/redis_7004.conf port 7004 bind 192.168.8.131 daemonize yes pidfile /var/run/redis_7004.pid dir /data/redis_data/7004 cluster-enabled yes cluster-config-file nodes_7004.conf cluster-node-timeout 10100 appendonly yes 建立各配置文件對應的數據庫目錄: [root@root ~]# mkdir /data/redis_data [root@root ~]# mkdir /data/redis_data/{7000,7002,7004} 依次啓動Redis服務7000,7002,7004: [root@root ~]# redis-server /etc/redis_7000.conf 啓動完成後,結果以下: [root@root ~]# ps aux |grep redis root 14423 0.6 0.5 145248 2640 ? Ssl 19:35 0:00 redis-server 192.168.8.131:7000 [cluster] root 14438 3.5 0.5 145248 2636 ? Ssl 19:37 0:00 redis-server 192.168.8.131:7002 [cluster] root 14443 13.8 0.5 145248 2636 ? Ssl 19:37 0:01 redis-server 192.168.8.131:7004 [cluster]
slave(IP:192.168.8.132)啓動三個端口:github
[root@root ~]# vim /etc/redis_7001.conf port 7001 bind 192.168.8.132 daemonize yes pidfile /var/run/redis_7001.pid dir /data/redis_data/7001 cluster-enabled yes cluster-config-file nodes_7001.conf cluster-node-timeout 10100 appendonly yes [root@root ~]# vim /etc/redis_7003.conf port 7003 bind 192.168.8.132 daemonize yes pidfile /var/run/redis_7003.pid dir /data/redis_data/7003 cluster-enabled yes cluster-config-file nodes_7003.conf cluster-node-timeout 10100 appendonly yes [root@root ~]# vim /etc/redis_7005.conf port 7005 bind 192.168.8.132 daemonize yes pidfile /var/run/redis_7005.pid dir /data/redis_data/7005 cluster-enabled yes cluster-config-file nodes_7005.conf cluster-node-timeout 10100 appendonly yes 建立各配置文件對應的數據庫目錄: [root@root ~]# mkdir /data/redis_data [root@root ~]# mkdir /data/redis_data/{7001,7003,7005} 依次啓動Redis服務7001,7003,7005: [root@root ~]# redis-server /etc/redis_7001.conf 啓動完成後結果以下: [root@root ~]# ps aux |grep redis root 5971 0.2 0.5 145248 2632 ? Ssl 19:41 0:00 redis-server 192.168.8.132:7001 [cluster] root 5976 0.1 0.5 145248 2636 ? Ssl 19:41 0:00 redis-server 192.168.8.132:7003 [cluster] root 5981 0.1 0.5 145248 2632 ? Ssl 19:41 0:00 redis-server 192.168.8.132:7005 [cluster]
安裝ruby2.2 (只須要一臺機器上運行就是master):redis
Redis集羣須要ruby的支持,須要先安裝ruby(Ruby只需在一臺機器上運行)。Redis4.0須要使用Ruby2.2,安裝方法以下(由於本機自帶的是2.0版本的ruby,因此須要使用以下方法把源碼包包製做成yum安裝包,而後藉助yum工具安裝ruby2.2———升級ruby版本)數據庫
安裝yum開發工具組: [root@root ~]# yum -y groupinstall "Development Tools" 升級庫文件: [root@root ~]# yum -y install gdbm-devel libdb4-devel libffi-devel libyaml libyaml-devel ncurses-devel openssl-devel readline-devel tcl-devel [root@root ~]# cd /root/ 建立製做rpm包的目錄: [root@root ~]# mkdir -p rpmbuild/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS} 下載Ruby的源碼包: [root@root ~]# wget http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.3.tar.gz -P rpmbuild/SOURCES 下載specs文件,用於製做rpm包: [root@root ~]# wget https://raw.githubusercontent.com/tjinjin/automate-ruby-rpm/master/ruby22x.spec -P rpmbuild/SPECS 製做rpm包: [root@root ~]# rpmbuild -bb rpmbuild/SPECS/ruby22x.spec ##此處須要耐心等待… 安裝Ruby2.2: [root@root ~]# yum -y localinstall rpmbuild/RPMS/x86_64/ruby-2.2.3-1.el7.centos.x86_64.rpm [root@root ~]# ruby -v ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
配置集羣就一步:vim
安裝Redis配置集羣的工具: [root@root ~]# gem install redis 將命令redis-trib.rb加入環境變量目錄下:(注意本身的redis版本) [root@root ~]# cp /usr/local/src/redis-4.0.2/src/redis-trib.rb /usr/bin/ [root@root ~]# redis-trib.rb create --replicas 1 192.168.8.131:7000 192.168.8.131:7002 192.168.8.131:7004 192.168.8.132:7001 192.168.8.132:7003 192.168.8.132:7005 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. ##注意:redis-trib.rb create --replicas 1 表示一個master對應幾個slave,此處的參數「1」表示master和slave一一對應 ##而後yes就把主從分好了,雙OK表明成功 ##這裏集羣配置完成,後面就能夠開始操做了
由於Redis集羣是分佈式結構,登陸任何一個端口均可新建等操做centos
鏈接: [root@root ~]# redis-cli -c -h 192.168.8.131 -p 7000 ##-c:=cluster,表示以集羣方式鏈接 建立數據: 192.168.8.131:7000> set cluster1 adaitest -> Redirected to slot [8483] located at 192.168.8.132:7001 OK ##該操做會被重定向到192.168.8.132:7001 192.168.8.132:7001> set cluster2 adai222 -> Redirected to slot [4416] located at 192.168.8.131:7000 OK 192.168.8.131:7000> set cluster3 adaitest333 OK 192.168.8.131:7000> set cluster4 adai2323 -> Redirected to slot [12678] located at 192.168.8.131:7002 OK 查看數據: 192.168.8.131:7002> get cluster1 -> Redirected to slot [8483] located at 192.168.8.132:7001 "adaitest" 192.168.8.132:7001> get cluster2 -> Redirected to slot [4416] located at 192.168.8.131:7000 "adai222" 192.168.8.131:7000> get cluster3 "adaitest333" 192.168.8.131:7000> get cluster4 -> Redirected to slot [12678] located at 192.168.8.131:7002 "adai2323"
集羣相關操做ruby
檢測集羣狀態,任意一個節點均可以: [root@root ~]# redis-trib.rb check 192.168.8.131:7000 列出節點:(其中是主是從一目瞭然) [root@root ~]# redis-cli -c -h 192.168.8.131 -p 7000 192.168.8.131:7000> cluster nodes ☆☆☆☆☆☆ 查看集羣信息:☆☆☆☆☆☆ 192.168.8.131:7000> cluster info 添加節點(執行該操做前先在slave建立redis_7007.conf並啓動): 192.168.8.131:7000> cluster meet 192.168.8.132 7007 OK 192.168.8.131:7000> cluster nodes 52e4b3484838be21fcf53b84198e362efd54bd39 192.168.8.132:7007@17007 master - 0 1507035952000 0 connected ##此時7007以master身份存在 再添加一個節點: 192.168.8.131:7000> cluster meet 192.168.8.131 7006 OK 192.168.8.131:7000> cluster nodes 677f27fb209ce45c823126fe38dbcf0b9fc43d93 192.168.8.131:7006@17006 master - 0 1507036137147 0 connected ##一樣是以master身份存在 ##即,使用以上方式添加的新節點都是以master身份存在!
把當前的節點設置爲指定節點的從
先更換到要設置的節點: [root@root ~]# redis-cli -c -h 192.168.8.131 -p 7006 設定爲7007的從: 192.168.8.131:7006> cluster replicate 52e4b3484838be21fcf53b84198e362efd54bd39(7007的inode) OK 查看: 192.168.8.131:7006> cluster nodes 52e4b3484838be21fcf53b84198e362efd54bd39 192.168.8.132:7007@17007 master - 0 1507036429244 7 connected 677f27fb209ce45c823126fe38dbcf0b9fc43d93 192.168.8.131:7006@17006 myself,slave 52e4b3484838be21fcf53b84198e362efd54bd39 0 1507036429000 0 connected #對比node號,即7006爲7007的從 移除某節點: 192.168.8.131:7006> cluster forget 52e4b3484838be21fcf53b84198e362efd54bd39 (error) ERR Can't forget my master! 192.168.8.131:7006> cluster forget 677f27fb209ce45c823126fe38dbcf0b9fc43d93 (error) ERR I tried hard but I can't forget myself... ## 即,不能移除master節點和當前所在節點 [root@adailinux ~]# redis-cli -c -h 192.168.8.131 -p 7000 192.168.8.131:7000> cluster forget 677f27fb209ce45c823126fe38dbcf0b9fc43d93 OK 查看: 192.168.8.131:7000> cluster nodes #此時7006已經不存在了。 保存當前配置: 192.168.8.131:7000> CLUSTER SAVECONFIG OK