五、搭建Redis 集群

本文主要是介绍五、搭建Redis 集群，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

准备6台redis服务器，具体要求如下：
ip地址 端口 etho 日志文件名
192.168.4.51 6051 都可以接收连接请求 redis51.log
192.168.4.52 6052 都可以接收连接请求 redis52.log
192.168.4.53 6053 都可以接收连接请求 redis53.log
192.168.4.54 6054 都可以接收连接请求 redis54.log
192.168.4.55 6055 都可以接收连接请求 redis55.log
192.168.4.56 6056 都可以接收连接请求 redis56.log
环境准备
1 在6台redis服务器上运行服务，按照如下要求修改配置文件后，重启redis服务。
]#vim /etc/redis/6379.conf
bind 192.168.4.56 #只指定物理接口ip地址
port 6056 #不允许相同
logfile /var/log/redis56.log #配置日志文件名称
daemonize yes #守护进程方式运行
cluster-enabled yes #开启集群
cluster-config-file nodes-6056.conf #集群的配置文件不要使用默认名称不允许相同
cluster-node-timeout 5000 #集群节点之间通信超时时间单位秒
:wq
停止服务
]# redis-cli -h 192.168.4.56 -p 6056 [ -a 密码 ] shutdown
启动服务
]# /etc/init.d/redis_6379 start
连接服务
[root@host56 ~]# redis-cli -h 192.168.4.56 -p 6056
装包： 在执行创建集群命令的主机安装ruby软件包（192.168.4.51）
安装解释ruby代码的软件包
[root@host51 ~]# yum -y install ruby rubygems
[root@host51 ~]# rpm -q rubygems ruby
rubygems-2.0.14.1-30.el7.noarch
ruby-2.0.0.648-30.el7.x86_64
[root@host51 ~]#
[root@host51 redis-cluster]# rpm -ivh --nodeps ruby-devel-2.0.0.648-30.el7.x86_64.rpm
安装ruby连接redis 接口程序 gem
[root@host51 redis-cluster]# which gem
/usr/bin/gem
[root@host51 redis-cluster]# gem install redis-3.2.1.gem
Successfully installed redis-3.2.1
Parsing documentation for redis-3.2.1
Installing ri documentation for redis-3.2.1
1 gem installed
[root@host51 redis-cluster]#
生成创建集群的脚本redis-trib.rb
[root@host51 src]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
[root@host51 src]# cd
[root@host51 ~]# cp redis-4.0.8/src/redis-trib.rb /usr/local/bin/
创建集群：
[root@host51 ~]# redis-trib.rb create --replicas 1 \
192.168.4.51:6051 \
192.168.4.52:6052 \
192.168.4.53:6053 \
192.168.4.54:6054 \
192.168.4.55:6055 \
192.168.4.56:6056
可能遇到以下错误：
[ERR] Node 192.168.4.54:6054 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
解决办法如下：
[root@db54 ~]# redis-cli -h 192.168.4.54 -p 6054
192.168.4.54:6054> flushall
OK
192.168.4.54:6054> keys *
(empty list or set)
192.168.4.54:6054> flushall
OK
192.168.4.54:6054> save
OK
192.168.4.54:6054> quit
[root@db54 ~]#

槽位个数是16384
范围0-16383
[root@host51 ~]# redis-trib.rb create --replicas 1 192.168.4.51:6051 192.168.4.52:6052
192.168.4.53:6053 192.168.4.54:6054 192.168.4.55:6055 192.168.4.56:6056 #创建集群
--replicas 1 表示给master 配置1个slave
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.4.51:6051
192.168.4.52:6052
192.168.4.53:6053
Adding replica 192.168.4.55:6055 to 192.168.4.51:6051
Adding replica 192.168.4.56:6056 to 192.168.4.52:6052
Adding replica 192.168.4.54:6054 to 192.168.4.53:6053
M: 0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051
slots:0-5460 (5461 slots) master
M: 5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052
slots:5461-10922 (5462 slots) master
M: 6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053
slots:10923-16383 (5461 slots) master
S: 388c33e7128fc961b381ad3b3c27c3c217912666 192.168.4.54:6054
replicates 6cdb4c64c48c0ee2ca35bf139660f31ca92821dc
S: 651f7d99965316c1b8a27a2e9b034a5b14c2be55 192.168.4.55:6055
replicates 0ec903c572270a90f3b140fba31aac15aaf5336b
S: a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056
replicates 5278df7384edc9774b1a36b0b9d60a813a7424a9
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join....
>>> Performing Cluster Check (using node 192.168.4.51:6051)
M: 0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: 388c33e7128fc961b381ad3b3c27c3c217912666 192.168.4.54:6054
slots:9678 (1 slots) master
0 additional replica(s)
S: 651f7d99965316c1b8a27a2e9b034a5b14c2be55 192.168.4.55:6055
slots: (0 slots) slave
replicates 0ec903c572270a90f3b140fba31aac15aaf5336b
S: a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056
slots: (0 slots) slave
replicates 5278df7384edc9774b1a36b0b9d60a813a7424a9
M: 6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053
slots:10923-16383 (5461 slots) master
0 additional replica(s)
M: 5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052
slots:5461-9677,9679-10922 (5461 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.
[root@host51 ~]#
[root@db52 redis-4.0.8]# cat /var/lib/redis/6052/nodes-6052.conf #集群配置文件
6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053@16053 master - 0 15260966113743 connected 10923-16383
0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051@16051 master - 0 15260966120001 connected 0-5460
388c33e7128fc961b381ad3b3c27c3c217912666 192.168.4.54:6054@16054 master - 0 15260966110434 connected 9678
a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056@16056 slave 5278df7384edc9774b1a36b0b9d60a813a7424a9 0 1526096611745 6 connected
651f7d99965316c1b8a27a2e9b034a5b14c2be55 192.168.4.55:6055@16055 slave 0ec903c572270a90f3b140fba31aac15aaf5336b 0 1526096613000 5 connected
5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052@16052 myself,master - 01526096612000 2 connected 5461-9677 9679-10922 vars currentEpoch 6 lastVoteEpoch 0
[root@db52 redis-4.0.8]#
每台 redis服务 在本机登录 查看集群信息
[root@host51 ~]# redis-cli -c -h 192.168.4.51 -p 6051
-c 连接集群中的主机
[root@host51 ~]# redis-cli -c -h 192.168.4.51 -p 6051
192.168.4.51:6051> CLUSTER info #查看本机信息
192.168.4.51:6051> CLUSTER nodes #查看集群信息
192.168.4.51:6051> quit
192.168.4.51:6051> CLUSTER nodes
388c33e7128fc961b381ad3b3c27c3c217912666 192.168.4.54:6054@16054 master - 0 15261088379424 connected 9678
651f7d99965316c1b8a27a2e9b034a5b14c2be55 192.168.4.55:6055@16055 slave 0ec903c572270a90f3b140fba31aac15aaf5336b 0 1526108838444 5 connected
a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056@16056 slave 5278df7384edc9774b1a36b0b9d60a813a7424a9 0 1526108838946 6 connected
6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053@16053 master - 0 15261088379423 connected 10923-16383
0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051@16051 myself,master - 01526108836000 1 connected 0-5460
5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052@16052 master - 01526108839447 2 connected 5461-9677 9679-10922
192.168.4.51:6051> CLUSTER info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:4
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:26580
cluster_stats_messages_pong_sent:20656
cluster_stats_messages_update_sent:2
cluster_stats_messages_sent:47238
cluster_stats_messages_ping_received:20651
cluster_stats_messages_pong_received:26580
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:47236
192.168.4.51:6051>
测试集群：连接master库 存储数据，对应的从库 会自动同步数据
[root@host51 ~]# redis-cli -c -h master库ip地址 -p 对应的端口号
[root@host51 ~]# redis-cli -c -h 192.168.4.51 -p 6051
192.168.4.51:6051> CLUSTER nodes
192.168.4.51:6051>
[root@host51 ~]# redis-cli -c -h 192.168.4.51 -p 6051
192.168.4.51:6051> set age 99
OK
192.168.4.51:6051> get age
"99"
192.168.4.51:6051>

[root@db54 ~]# redis-cli -c -h 192.168.4.54 -p 6054
192.168.4.54:6054> get age
-> Redirected to slot [741] located at 192.168.4.51:6051
"99"
192.168.4.51:6051>

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