Redis Cluster(集群)的搭建
一、Redis的下载、安装、启动(单实例)
我们统一将Redis安装在/opt目录下,执行命令如下:
$ cd /opt $ wget http://download.redis.io/releases/redis-4.0.9.tar.gz $ tar zxvf redis-4.0.9.tar.gz $ cd redis-4.0.9 $ make
安装完成,下面我们启动Redis服务:
$ cd /opt/redis-4.0.9 $ ./src/redis-server
Redis启动成功,将采用Redis的默认配置。也可修改Redis根目录下的redis.conf文件,并在Redis启动时,指定配置文件,如下:
$ ./src/redis-server redis.conf
注意,由于Redis的保护模式,只绑定了本机的127.0.0.1,从其他机器是不能访问的。所以我们需要添加本机的ip 192.168.xxx.xxx。
二、Redis Cluster(集群)的搭建
由于我们的机器有限,我们将采用一台机器多个端口的方式搭建我们的Redis集群。
首先我们创建Redis的配置文件目录,如下:
$ cd /opt $ mkdir redis-cluster
并在redis-cluster目录下创建6个节点的配置文件。分别为:
- redis-7000.conf
- redis-7001.conf
- redis-7002.conf
- redis-7003.conf
- redis-7004.conf
- redis-7005.conf
后面的7000,7001等是redis启动的端口号。接下来编辑文件的内容:
#该集群阶段的端口 port 7000 #为每一个集群节点指定一个pid_file pidfile /var/run/redis_7000.pid #在bind指令后添加本机的ip bind 127.0.0.1 149.28.37.147 #找到Cluster配置的代码段,使得Redis支持集群 cluster-enabled yes #每一个集群节点都有一个配置文件,这个文件是不能手动编辑的。确保每一个集群节点的配置文件不通 cluster-config-file nodes-7000.conf #集群节点的超时时间,单位:ms,超时后集群会认为该节点失败 cluster-node-timeout 5000 #最后将appendonly改成yes appendonly yes
这样一个节点的配置就完成,其他的5个节点也做同样的配置。并将6个节点的Redis实例启动:
$ nohup /opt/redis-4.0.9/src/redis-server /opt/redis-cluster/redis-7000.conf & $ nohup /opt/redis-4.0.9/src/redis-server /opt/redis-cluster/redis-7001.conf & $ nohup /opt/redis-4.0.9/src/redis-server /opt/redis-cluster/redis-7002.conf & $ nohup /opt/redis-4.0.9/src/redis-server /opt/redis-cluster/redis-7003.conf & $ nohup /opt/redis-4.0.9/src/redis-server /opt/redis-cluster/redis-7004.conf & $ nohup /opt/redis-4.0.9/src/redis-server /opt/redis-cluster/redis-7005.conf &
使用这6个节点创建集群:
$ /opt/redis-4.0.9/src/redis-trib.rb create --replicas 1 149.28.37.147:7000 149.28.37.147:7001 149.28.37.147:7002 149.28.37.147:7003 149.28.37.147:7004 149.28.37.147:7005
–replicas 1 表示我们希望为集群中的每个主节点创建一个从节点。
执行命令后会显示:
>>> Creating cluster >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 149.28.37.147:7000 149.28.37.147:7001 149.28.37.147:7002 Adding replica 149.28.37.147:7004 to 149.28.37.147:7000 Adding replica 149.28.37.147:7005 to 149.28.37.147:7001 Adding replica 149.28.37.147:7003 to 149.28.37.147:7002 >>> Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same host as their master M: 65625091304b0fa2dd75a00f62b6aceac1701094 149.28.37.147:7000 slots:0-5460 (5461 slots) master M: 4da569bf8402e4f75ab6e0fe7076919c22e3f900 149.28.37.147:7001 slots:5461-10922 (5462 slots) master M: b977680e24f23f8fec96876d9014803ca752e2e2 149.28.37.147:7002 slots:10923-16383 (5461 slots) master S: 7183e47a64bca23157140229352455d1a1407dc2 149.28.37.147:7003 replicates b977680e24f23f8fec96876d9014803ca752e2e2 S: b2f916a643fefef1d43dbd1ef5d22f72c0ee43d6 149.28.37.147:7004 replicates 65625091304b0fa2dd75a00f62b6aceac1701094 S: e362d9aae5fe3e9c343d266a5ab952272e0e37b0 149.28.37.147:7005 replicates 4da569bf8402e4f75ab6e0fe7076919c22e3f900 Can I set the above configuration? (type 'yes' to accept):
我们输入yes,回车:
>>> 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 149.28.37.147:7000) M: 65625091304b0fa2dd75a00f62b6aceac1701094 149.28.37.147:7000 slots:0-5460 (5461 slots) master 1 additional replica(s) M: b977680e24f23f8fec96876d9014803ca752e2e2 149.28.37.147:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: e362d9aae5fe3e9c343d266a5ab952272e0e37b0 149.28.37.147:7005 slots: (0 slots) slave replicates 4da569bf8402e4f75ab6e0fe7076919c22e3f900 S: b2f916a643fefef1d43dbd1ef5d22f72c0ee43d6 149.28.37.147:7004 slots: (0 slots) slave replicates 65625091304b0fa2dd75a00f62b6aceac1701094 M: 4da569bf8402e4f75ab6e0fe7076919c22e3f900 149.28.37.147:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s) S: 7183e47a64bca23157140229352455d1a1407dc2 149.28.37.147:7003 slots: (0 slots) slave replicates b977680e24f23f8fec96876d9014803ca752e2e2 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
集群搭建完毕。我们可以使用Spring-Boot非常方便的去访问Redis集群了。
三、Ruby版本过低问题
在使用redis-trib.rb时,需要先安装ruby:
$ yum -y install ruby ruby-devel rubygems rpm-build $ gem install redis
这是出现redis requires Ruby version >= 2.2.2的报错,我们先安装rvm:
$ curl -L get.rvm.io | bash -s stable $ source /usr/local/rvm/scripts/rvm
查看版本
rvm list known
安装2.4.1版本
rvm install 2.4.1
使用2.4.1版本
rvm use 2.4.1
移除2.0.0版本
rvm remove 2.0.0
查看当前ruby版本
ruby --version
再安装redis,就可以了
gem install redis