Redis 4 集群搭建
一、概述
Redis3.0版本之后支持Cluster,目前redis cluster支持的特性有:
节点自动发现,slave->master 选举,集群容错,Hot resharding:在线分片
进群管理:cluster xxx,基于配置(nodes-port.conf)的集群管理,ASK 转向/MOVED 转向机制.
二、redis cluster安装
1、下载和解包
cd /usr/local/
wget http://download.redis.io/releases/redis-4.0.1.tar.gz
tar -xvzf redis-4.0.1.tar.gz
2、 编译安装
cd redis-4.0.1
make && make install
3、创建redis节点
选择2台服务器,分别为:192.168.59.131,192.168..59.130.每分服务器有3个节点。
先在192.168.59.131创建3个节点:
cd /usr/local/
//创建集群目录
mkdir redis_cluster
//分别代表三个节点 其对应端口 7000 7001 7002
mkdir 7000 7001 7002
//以创建7000节点为例,拷贝到7000目录
cp /usr/local/redis-4.0.1/redis.conf ./redis_cluster/7000/
//拷贝到7001目录
cp /usr/local/redis-4.0.1/redis.conf ./redis_cluster/7001/
//拷贝到7002目录
cp /usr/local/redis-4.0.1/redis.conf ./redis_cluster/7002/
分别对7001,7002、7003文件夹中的3个文件修改对应的配置
daemonize yes //redis后台运行
pidfile /var/run/redis_7000.pid //pidfile文件对应7000,7002,7003
bind 192.168.59.131 //绑定ip地址
port 7000 //端口7000,7002,7003
cluster-enabled yes //开启集群 把注释#去掉
cluster-config-file nodes_7000.conf //集群的配置 配置文件首次启动自动生成 7000,7001,7002
cluster-node-timeout 5000 //请求超时 设置5秒够了
appendonly yes //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
在192.168.59.130创建3个节点:对应的端口改为7003,7004,7005.配置对应的改一下就可以了
4、两台机启动各节点
第一台机器上执行
redis-server redis_cluster/7000/redis.conf
redis-server redis_cluster/7001/redis.conf
redis-server redis_cluster/7002/redis.conf
另外一台机器上执行
redis-server redis_cluster/7003/redis.conf
redis-server redis_cluster/7004/redis.conf
redis-server redis_cluster/7005/redis.conf
5、查看服务
ps -ef | grep redis #查看是否启动成功
netstat -tnlp | grep redis #可以看到redis监听端口
三、创建集群
前面已经准备好了搭建集群的redis节点,接下来我们要把这些节点都串连起来搭建集群。
官方提供了一个工具:redis-trib.rb(/usr/local/redis-4.0.1/src/redis-trib.rb) 看后缀就知道它是用ruby写的一个程序,所以我们还得安装ruby.
yum -y install ruby ruby-devel rubygems rpm-build
再用 gem 这个命令来安装 redis接口 gem是ruby的一个工具包.
gem install redis
接下来运行一下redis-trib.rb
[root@localhost local]# /usr/local/redis-4.0.1/src/redis-trib.rb
Usage: redis-trib <command> <options> <arguments ...>
create host1:port1 ... hostN:portN
--replicas <arg>
check host:port
info host:port
fix host:port
--timeout <arg>
reshard host:port
--from <arg>
--to <arg>
--slots <arg>
--yes
--timeout <arg>
--pipeline <arg>
rebalance host:port
--weight <arg>
--auto-weights
--use-empty-masters
--timeout <arg>
--simulate
--pipeline <arg>
--threshold <arg>
add-node new_host:new_port existing_host:existing_port
--slave
--master-id <arg>
del-node host:port node_id
set-timeout host:port milliseconds
call host:port command arg arg .. arg
import host:port
--from <arg>
--copy
--replace
help (show this help)
For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.
确认所有的节点都启动,接下来使用参数create 创建 (在192.168.59.131中来创建)
/usr/local/redis-4.0.1/src/redis-trib.rb create --replicas 1 192.168.59.131:7000 192.168.59.131:7001 192.168.59.131:7003 192.168.59.130:7003 192.168.59.130:7004 192.168.59.130:7005
--replicas 1 表示 自动为每一个master节点分配一个slave节点 上面有6个节点,程序会按照一定规则生成 3个master(主)3个slave(从)
防火墙一定要开放监听的端口,否则会创建失败。
运行中,提示Can I set the above configuration? (type 'yes' to accept): yes //输入yes
[root@localhost local]# /usr/local/redis-4.0.1/src/redis-trib.rb create --replicas 1 192.168.59.131:7000 192.168.59.131:7001 192.168.59.131:7003 192.168.59.130:7003 192.168.59.130:7004 192.168.59.130:7005
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.59.131:7000
192.168.59.130:7003
192.168.59.131:7001
Adding replica 192.168.59.130:7004 to 192.168.59.131:7000
Adding replica 192.168.59.131:7002 to 192.168.59.130:7003
Adding replica 192.168.59.130:7005 to 192.168.59.131:7001
M: 048937fd4ac542c135e7527f681be12348e8c8d0 192.168.59.131:7000
slots:0-5460 (5461 slots) master
M: 2039bc32bf55d21d74296cdc91a316022a7afc4b 192.168.59.131:7001
slots:10923-16383 (5461 slots) master
S: 76514c28d0a40f9751ccaf117d1f8f1d0878475a 192.168.59.131:7002
replicates a58a304964ff10d10f4323341f7084c9f60f5124
M: a58a304964ff10d10f4323341f7084c9f60f5124 192.168.59.130:7003
slots:5461-10922 (5462 slots) master
S: 7512d76b416d09619d3b639a94945a676d7b8826 192.168.59.130:7004
replicates 048937fd4ac542c135e7527f681be12348e8c8d0
S: 7824b9721cb21de60c8d132d668fd3ac5c4eae49 192.168.59.130:7005
replicates 2039bc32bf55d21d74296cdc91a316022a7afc4b
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 192.168.59.131:7000)
M: 048937fd4ac542c135e7527f681be12348e8c8d0 192.168.59.131:7000
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 76514c28d0a40f9751ccaf117d1f8f1d0878475a 192.168.59.131:7002
slots: (0 slots) slave
replicates a58a304964ff10d10f4323341f7084c9f60f5124
M: a58a304964ff10d10f4323341f7084c9f60f5124 192.168.59.130:7003
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 7512d76b416d09619d3b639a94945a676d7b8826 192.168.59.130:7004
slots: (0 slots) slave
replicates 048937fd4ac542c135e7527f681be12348e8c8d0
M: 2039bc32bf55d21d74296cdc91a316022a7afc4b 192.168.59