redis之cluster(集群)

搭建redis cluster

1. 准备节点

2. 节点间的通信

3. 分配槽位给节点

redis-cluster架构

多个服务端，负责读写，彼此通信，redis指定了16384个槽。

多匹马儿，负责运输数据，马儿分配16384个槽位，管理数据。

ruby的脚本自动就把分配槽位这事做了

启动所有redis-cluster节点

我准备了6个节点, 配置文件如下, 除了端口不一样, 其他都一样

配置文件解释:

port 7000
daemonize yes
dir "/opt/redis/data"
logfile "7000.log"
dbfilename "dump-7000.rdb"
cluster-enabled yes   #开启集群模式
cluster-config-file nodes-7000.conf　　#集群内部的配置文件
cluster-require-full-coverage no　　#redis cluster需要16384个slot都正常的时候才能对外提供服务，换句话说，只要任何一个slot异常那么整个cluster不对外提供服务。 因此生产环境一般为no

启动所有的节点

此时的redis虽然已经启动了, 但是还不能使用, 因为现在运行在集群模式下, 集群还没有配置完了.....

准备ruby环境

开启redis-cluster

下载ruby安装包

#下载ruby
wget https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.1.tar.gz

#安装ruby
tar -xvf ruby-2.3.1.tar.gz
./configure --prefix=/opt/ruby/
make && make install

#准备一个ruby命令
#准备一个gem软件包管理命令
#拷贝ruby命令到path下/usr/local/ruby
cp /opt/ruby/bin/ruby /usr/local/bin/
cp bin/gem /usr/local/bin

安装gem安装redis模块, 类似于pip install redis

wget http://rubygems.org/downloads/redis-3.3.0.gem

gem install -l redis-3.3.0.gem

#查看gem有哪些包
gem list -- check redis gem

安装redis-trib.rb命令

在redis/src目录下

添加到环境变量

[root@web01 05:15 /opt/redis-4.0.10/src]# cp redis-trib.rb /usr/local/bin/

一键开启redis-cluster

#每个主节点，有一个从节点，代表--replicas 1
redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005

#集群自动分配主从关系  7000、7001、7002为 7003、7004、7005 主动关系

[root@web01 05:15 /opt/redis-4.0.10/src]# redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
Adding replica 127.0.0.1:7004 to 127.0.0.1:7000
Adding replica 127.0.0.1:7005 to 127.0.0.1:7001
Adding replica 127.0.0.1:7003 to 127.0.0.1:7002
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: fb345360da148c168f590237e0c5557815654c34 127.0.0.1:7000
   slots:0-5460 (5461 slots) master
M: 23875b1844fe1af2f5287877298abaf7c8eeaea3 127.0.0.1:7001
   slots:5461-10922 (5462 slots) master
M: 39e2b69102c684c0a4973395acb37120f60db22c 127.0.0.1:7002
   slots:10923-16383 (5461 slots) master
S: 390c6bfbd8fe0a94c37b9b41c45ec0a033c58e85 127.0.0.1:7003
   replicates 39e2b69102c684c0a4973395acb37120f60db22c
S: 115c8166b48a6b2835a5fd89b3bcb021687e64d5 127.0.0.1:7004
   replicates fb345360da148c168f590237e0c5557815654c34
S: 28b7664378d6aea262bc5a9ee890d4a857bf397e 127.0.0.1:7005
   replicates 23875b1844fe1af2f5287877298abaf7c8eeaea3
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 127.0.0.1:7000)
M: fb345360da148c168f590237e0c5557815654c34 127.0.0.1:7000
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
S: 28b7664378d6aea262bc5a9ee890d4a857bf397e 127.0.0.1:7005
   slots: (0 slots) slave
   replicates 23875b1844fe1af2f5287877298abaf7c8eeaea3
M: 23875b1844fe1af2f5287877298abaf7c8eeaea3 127.0.0.1:7001
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 115c8166b48a6b2835a5fd89b3bcb021687e64d5 127.0.0.1:7004
   slots: (0 slots) slave
   replicates fb345360da148c168f590237e0c5557815654c34
S: 390c6bfbd8fe0a94c37b9b41c45ec0a033c58e85 127.0.0.1:7003
   slots: (0 slots) slave
   replicates 39e2b69102c684c0a4973395acb37120f60db22c
M: 39e2b69102c684c0a4973395acb37120f60db22c 127.0.0.1:7002
   slots:10923-16383 (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.

查看集群状态的命令

redis-cli -p 7000 cluster info  

redis-cli -p 7000 cluster nodes  #等同于查看nodes-7000.conf文件节点信息

集群主节点状态
redis-cli -p 7000 cluster nodes | grep master
集群从节点状态
redis-cli -p 7000 cluster nodes | grep slave

测试集群

测试写入集群数据，登录集群必须使用redis-cli -c -p 7000必须加上-c参数

redis集群部署完成