环境
· CentOS版本：CentOS 7
· 三台主机(IP)：10.91.250.146,10.91.250.147,10.91.250.148
· Redis版本：4.0.8
注意事项
安裝 GCC 编译工具 不然会有编译不过的问题
$ yum install -y gcc g++ gcc-c++ make
升级所有的包，防止出现版本过久不兼容问题
$ yum -y update
centos 7.x
$ systemctl stop firewalld.service # 停止firewall
$ systemctl disable firewalld.service #禁止firewall开机启动
集群搭建
安装 Redis
下载，解压，编译安装
cd /opt$ wget http://download.redis.io/releases/redis-4.0.8.tar.gz$ tar xzf redis-4.0.8.tar.gz$ cd redis-4.0.8$ make
如果因为上次编译失败，有残留的文件
$ make distclean
创建节点
1.首先在 10.91.250.146机器上 /opt/redis-4.0.8目录下创建 redis-cluster 目录
$ mkdir /opt/redis-4.0.8/redis-cluster
2.在 redis-cluster 目录下，创建名为7000、7001、7002的目录
$ cd /opt/redis-4.0.8/redis-cluster
$ mkdir 7000 7001 7002
3.分别修改这三个配置文件，把如下redis.conf 配置内容粘贴进去
$ vi 7000/redis.conf
$ vi 7001/redis.conf
$ vi 7002/redis.conf
redis.conf 配置
port 7000
bind 10.91.250.146
daemonize yes
pidfile /var/run/redis_7000.pidcluster-enabled yescluster-config-file nodes_7000.confcluster-node-timeout 10100
appendonly yes
redis.conf 配置说明
#端口7000,7001,7002
port 7000
#默认ip为127.0.0.1，需要改为其他节点机器可访问的ip，否则创建集群时无法访问对应的端口，无法创建集群
bind 10.91.250.146
#redis后台运行
daemonize yes
#pidfile文件对应7000，7001，7002
pidfile /var/run/redis_7000.pid
#开启集群，把注释#去掉
cluster-enabled yes
#集群的配置，配置文件首次启动自动生成 7000，7001，7002
cluster-config-file nodes_7000.conf
#请求超时，默认15秒，可自行设置
cluster-node-timeout 10100
#aof日志开启，有需要就开启，它会每次写操作都记录一条日志
appendonly yes
接着在另外两台机器上(10.91.250.147，10.91.250.148)重复以上三步，只是把目录改为7003、7004、7005、7006、7007、7008对应的配置文件也按照这个规则修改即可
启动集群
#第一台机器上执行 3个节点
$ for((i=0;i<=2;i++)); do /opt/redis-4.0.8/src/redis-server /opt/redis-4.0.8/redis-cluster/700$i/redis.conf; done
#第二台机器上执行 3个节点
$ for((i=3;i<=5;i++)); do /opt/redis-4.0.8/src/redis-server /opt/redis-4.0.8/redis-cluster/700$i/redis.conf; done
#第三台机器上执行 3个节点
$ for((i=6;i<=8;i++)); do /opt/redis-4.0.8/src/redis-server /opt/redis-4.0.8/redis-cluster/700$i/redis.conf; done
检查服务
检查各 Redis 各个节点启动情况
$ ps -ef | grep redis //redis是否启动成功
$ netstat -tnlp | grep redis //监听redis端口
安装 Ruby
redis-trib.rb 这个工具构建redis集群的时候，“redis requires Ruby version >= 2.2.2”
~]# wget http://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.5.tar.gz
~]# tar zxvf ruby-2.3.5.tar.gz
~]# cd ruby-2.3.5
ruby-2.3.5]# ./configure --prefix=/opt/ruby
ruby-2.3.5]# make && make install
ruby-2.3.5]# ln -s /opt/ruby/bin/ruby /usr/bin/ruby
ruby-2.3.5]# ln -s /opt/ruby/bin/gem /usr/bin/gem
~]#ruby -v //查看一下
安装rubygem redis依赖
~]# wget http://rubygems.org/downloads/redis-3.3.0.gem
~]# gem install -l redis-3.3.0.gem
创建集群
注意：在任意一台上运行 不要在每台机器上都运行，一台就够了
Redis 官方提供了 redis-trib.rb 这个工具，就在解压目录的 src 目录中
/redis/redis-4.0.8/src/redis-trib.rb create --replicas 1 10.91.250.146:7000 10.91.250.146:7001 10.91.250.146:7002 10.91.250.147:7003 10.91.250.147:7004 10.91.250.147:7005 10.91.250.148:7006 10.91.250.148:7007 10.91.250.148:7008
出现以下内容
[root@localhost redis-cluster]# /opt/redis-4.0.8/src/redis-trib.rb create --replicas 1 10.91.250.146:7000 10.91.250.146:7001 10.91.250.146:7002 10.91.250.147:7003 10.91.250.147:7004 10.91.250.147:7005 10.91.250.148:7006 10.91.250.148:7007 10.91.250.148:7008
>>> Creating cluster
>>> Performing hash slots allocation on 9 nodes...
Using 4 masters:10.91.250.146:700010.91.250.147:700310.91.250.148:700610.91.250.146:7001
Adding replica 10.91.250.147:7004 to 10.91.250.146:7000
Adding replica 10.91.250.148:7007 to 10.91.250.147:7003
Adding replica 10.91.250.146:7002 to 10.91.250.148:7006
Adding replica 10.91.250.147:7005 to 10.91.250.146:7001
Adding replica 10.91.250.148:7008 to 10.91.250.146:7000M: 7c622ac191edd40dd61d9b79b27f6f69d02a5bbf 10.91.250.146:7000 slots:0-4095 (4096 slots) masterM: 44c81c15b01d992cb9ede4ad35477ec853d70723 10.91.250.146:7001 slots:12288-16383 (4096 slots) masterS: 38f03c27af39723e1828eb62d1775c4b6e2c3638 10.91.250.146:7002
replicates f1abb62a8c9b448ea14db421bdfe3f1d8075189cM: 987965baf505a9aa43e50e46c76189c51a8f17ec 10.91.250.147:7003 slots:4096-8191 (4096 slots) masterS: 6555292fed9c5d52fcf5b983c441aff6f96923d5 10.91.250.147:7004
replicates 7c622ac191edd40dd61d9b79b27f6f69d02a5bbfS: 2b5ba254a0405d4efde4c459867b15176f79244a 10.91.250.147:7005
replicates 44c81c15b01d992cb9ede4ad35477ec853d70723M: f1abb62a8c9b448ea14db421bdfe3f1d8075189c 10.91.250.148:7006 slots:8192-12287 (4096 slots) masterS: eb4067373d36d8a8df07951f92794e67a6aac022 10.91.250.148:7007
replicates 987965baf505a9aa43e50e46c76189c51a8f17ecS: 2919e041dd3d1daf176d6800dcd262f4e727f366 10.91.250.148:7008
replicates 7c622ac191edd40dd61d9b79b27f6f69d02a5bbf
Can I set the above configuration? (type 'yes' to accept): yes
输入 yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the clusterWaiting for the cluster to join.........
>>> Performing Cluster Check (using node 10.91.250.146:7000)M: 7c622ac191edd40dd61d9b79b27f6f69d02a5bbf 10.91.250.146:7000
slots:0-4095 (4096 slots) master
2 additional replica(s)S: 6555292fed9c5d52fcf5b983c441aff6f96923d5 10.91.250.147:7004
slots: (0 slots) slave
replicates 7c622ac191edd40dd61d9b79b27f6f69d02a5bbfM: 44c81c15b01d992cb9ede4ad35477ec853d70723 10.91.250.146:7001
slots:12288-16383 (4096 slots) master
1 additional replica(s)S: 2919e041dd3d1daf176d6800dcd262f4e727f366 10.91.250.148:7008
slots: (0 slots) slave
replicates 7c622ac191edd40dd61d9b79b27f6f69d02a5bbfM: f1abb62a8c9b448ea14db421bdfe3f1d8075189c 10.91.250.148:7006
slots:8192-12287 (4096 slots) master
1 additional replica(s)S: eb4067373d36d8a8df07951f92794e67a6aac022 10.91.250.148:7007
slots: (0 slots) slave
replicates 987965baf505a9aa43e50e46c76189c51a8f17ecS: 38f03c27af39723e1828eb62d1775c4b6e2c3638 10.91.250.146:7002
slots: (0 slots) slave
replicates f1abb62a8c9b448ea14db421bdfe3f1d8075189cS: 2b5ba254a0405d4efde4c459867b15176f79244a 10.91.250.147:7005
slots: (0 slots) slave
replicates 44c81c15b01d992cb9ede4ad35477ec853d70723M: 987965baf505a9aa43e50e46c76189c51a8f17ec 10.91.250.147:7003
slots:4096-8191 (4096 slots) master
1 additional replica(s)[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...[OK] All 16384 slots covered.
关闭集群
这样也可以，推荐
$ pkill redis
循环节点逐个关闭
$ for((i=0;i<=2;i++)); do /opt/redis-4.0.8/src/redis-cli -c -h 10.91.250.146 -p 700$i shutdown; done
$ for((i=3;i<=5;i++)); do /opt/redis-4.0.8/src/redis-cli -c -h 10.91.250.147 -p 700$i shutdown; done
$ for((i=6;i<=8;i++)); do /opt/redis-4.0.8/src/redis-cli -c -h 10.91.250.148 -p 700$i shutdown; done
集群验证
连接集群测试
参数 -C 可连接到集群，因为 redis.conf 将 bind 改为了ip地址，所以 -h 参数不可以省略，-p 参数为端口号
· 我们在10.91.250.146机器redis 7000 的节点set 一个key
$ /opt/redis-4.0.8/src/redis-cli -h 10.91.250.146 -c -p 700010.91.250.146:7000> set name www.ymq.io
-> Redirected to slot [5798] located at 10.91.250.147:7003
OK10.91.250.147:7003> get name"www.ymq.io"10.91.250.147:7003>
发现redis set name 之后重定向到10.91.250.147机器 redis 7003 这个节点
· 我们在10.91.250.148机器redis 7008 的节点get一个key
[root@localhost redis-cluster]# /opt/redis-4.0.8/src/redis-cli -h 10.91.250.148 -c -p 700810.91.250.148:7008> get name
-> Redirected to slot [5798] located at 10.91.250.147:7003"www.ymq.io"10.91.250.147:7003>
发现redis get name 重定向到10.91.250.147机器 redis 7003 这个节点
如果您看到这样的现象，说明集群已经是可用的了
检查集群状态
$ /opt/redis-4.0.8/src/redis-trib.rb check 10.91.250.146:7000
>>> Performing Cluster Check (using node 10.91.250.146:7000)M: 7c622ac191edd40dd61d9b79b27f6f69d02a5bbf 10.91.250.146:7000
slots:0-4095 (4096 slots) master
2 additional replica(s)S: 6555292fed9c5d52fcf5b983c441aff6f96923d5 10.91.250.147:7004
slots: (0 slots) slave
replicates 7c622ac191edd40dd61d9b79b27f6f69d02a5bbfM: 44c81c15b01d992cb9ede4ad35477ec853d70723 10.91.250.146:7001
slots:12288-16383 (4096 slots) master
1 additional replica(s)S: 2919e041dd3d1daf176d6800dcd262f4e727f366 10.91.250.148:7008
slots: (0 slots) slave
replicates 7c622ac191edd40dd61d9b79b27f6f69d02a5bbfM: f1abb62a8c9b448ea14db421bdfe3f1d8075189c 10.91.250.148:7006
slots:8192-12287 (4096 slots) master
1 additional replica(s)S: eb4067373d36d8a8df07951f92794e67a6aac022 10.91.250.148:7007
slots: (0 slots) slave
replicates 987965baf505a9aa43e50e46c76189c51a8f17ecS: 38f03c27af39723e1828eb62d1775c4b6e2c3638 10.91.250.146:7002
slots: (0 slots) slave
replicates f1abb62a8c9b448ea14db421bdfe3f1d8075189cS: 2b5ba254a0405d4efde4c459867b15176f79244a 10.91.250.147:7005
slots: (0 slots) slave
replicates 44c81c15b01d992cb9ede4ad35477ec853d70723M: 987965baf505a9aa43e50e46c76189c51a8f17ec 10.91.250.147:7003
slots:4096-8191 (4096 slots) master
1 additional replica(s)[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...[OK] All 16384 slots covered.
列出集群节点
列出集群当前已知的所有节点（node），以及这些节点的相关信息
$ /opt/redis-4.0.8/src/redis-cli -h 10.91.250.146 -c -p 7000
10.91.250.146:7000> cluster nodes
6555292fed9c5d52fcf5b983c441aff6f96923d5 10.91.250.147:7004@17004 slave 7c622ac191edd40dd61d9b79b27f6f69d02a5bbf 0 1502815268317 5 connected44c81c15b01d992cb9ede4ad35477ec853d70723 10.91.250.146:7001@17001 master - 0 1502815268000 2 connected 12288-163832919e041dd3d1daf176d6800dcd262f4e727f366 10.91.250.148:7008@17008 slave 7c622ac191edd40dd61d9b79b27f6f69d02a5bbf 0 1502815269000 9 connected7c622ac191edd40dd61d9b79b27f6f69d02a5bbf 10.91.250.146:7000@17000 myself,master - 0 1502815269000 1 connected 0-4095
f1abb62a8c9b448ea14db421bdfe3f1d8075189c 10.91.250.148:7006@17006 master - 0 1502815269000 7 connected 8192-12287
eb4067373d36d8a8df07951f92794e67a6aac022 10.91.250.148:7007@17007 slave 987965baf505a9aa43e50e46c76189c51a8f17ec 0 1502815267000 8 connected38f03c27af39723e1828eb62d1775c4b6e2c3638 10.91.250.146:7002@17002 slave f1abb62a8c9b448ea14db421bdfe3f1d8075189c 0 1502815269327 7 connected2b5ba254a0405d4efde4c459867b15176f79244a 10.91.250.147:7005@17005 slave 44c81c15b01d992cb9ede4ad35477ec853d70723 0 1502815270336 6 connected987965baf505a9aa43e50e46c76189c51a8f17ec 10.91.250.147:7003@17003 master - 0 1502815271345 4 connected 4096-819110.91.250.146:7000>
打印集群信息
$ 10.91.250.146:7000> cluster info
cluster_state:okcluster_slots_assigned:16384cluster_slots_ok:16384cluster_slots_pfail:0cluster_slots_fail:0cluster_known_nodes:9cluster_size:4cluster_current_epoch:9cluster_my_epoch:1cluster_stats_messages_ping_sent:485cluster_stats_messages_pong_sent:485cluster_stats_messages_sent:970cluster_stats_messages_ping_received:477cluster_stats_messages_pong_received:485cluster_stats_messages_meet_received:8cluster_stats_messages_received:970
10.91.250.146:7000>
集群命令
语法格式
redis-cli -c -p port
集群
cluster info ：打印集群的信息
cluster nodes ：列出集群当前已知的所有节点（ node），以及这些节点的相关信息。
节点
cluster meet <ip> <port> ：将 ip 和 port 所指定的节点添加到集群当中，让它成为集群的一份子。
cluster forget <node_id> ：从集群中移除 node_id 指定的节点。
cluster replicate <node_id> ：将当前节点设置为 node_id 指定的节点的从节点。
cluster saveconfig ：将节点的配置文件保存到硬盘里面。
槽(slot)
cluster addslots <slot> [slot ...] ：将一个或多个槽（ slot）指派（ assign）给当前节点。
cluster delslots <slot> [slot ...] ：移除一个或多个槽对当前节点的指派。
cluster flushslots ：移除指派给当前节点的所有槽，让当前节点变成一个没有指派任何槽的节点。
cluster setslot <slot> node <node_id> ：将槽 slot 指派给 node_id 指定的节点，如果槽已经指派给另一个节点，那么先让另一个节点删除该槽>，然后再进行指派。
cluster setslot <slot> migrating <node_id> ：将本节点的槽 slot 迁移到 node_id 指定的节点中。
cluster setslot <slot> importing <node_id> ：从 node_id 指定的节点中导入槽 slot 到本节点。
cluster setslot <slot> stable ：取消对槽 slot 的导入（ import）或者迁移（ migrate）。
键
cluster keyslot <key> ：计算键 key 应该被放置在哪个槽上。cluster countkeysinslot <slot> ：返回槽 slot 目前包含的键值对数量。cluster getkeysinslot <slot> <count> ：返回 count 个 slot 槽中的键 。