安装 redis 集群

本文讲述 redis 集群的部署步骤。redis 是当前主流的分布式缓存服务, 支持集群部署, 相比同类产品 memcached,支持更多的数据结构。

1. 约定

操作系统：Ubuntu 16.04.3 LTS

2. 安装

2.1 编译安装单机版 redis

tar -zxvf /root/redis-5.0.5.tar.gz -c /root
cd /root/redis-5.0.5
make -j2 PREFIX=/usr/local/redis install
cp /root/redis-5.0.5/redis.conf /usr/local/redis/

2.2 准备集群目录

mkdir -p /usr/local/redis-cluster/bin
mkdir -p /usr/local/redis-cluster/9001
mkdir -p /usr/local/redis-cluster/9002
mkdir -p /usr/local/redis-cluster/9003
mkdir -p /usr/local/redis-cluster/9004
mkdir -p /usr/local/redis-cluster/9005
mkdir -p /usr/local/redis-cluster/9006

2.3 准备集群可执行文件

cp /usr/local/redis/bin/* /usr/local/redis-cluster/bin/
cp /root/redis-5.0.5/src/mkreleasehdr.sh /usr/local/redis-cluster/bin/
cp /root/redis-5.0.5/src/redis-trib.rb /usr/local/redis-cluster/bin/

2.4 复制一个新 redis 实例

cp -r /usr/local/redis/ /usr/local/redis-cluster/9001/

修改配置文件

vi /usr/local/redis-cluster/9001/redis.conf

<!-- 每个节点的端口号 -->
port 9001
daemonize yes
<!-- 绑定当前机器 IP -->
bind 172.18.100.177
dir /usr/local/redis-cluster/9001/data/
<!-- pid 9001 和 port 要对应 -->
pidfile /var/run/redis_9001.pid
<!-- 启动集群模式 -->
cluster-enabled yes
<!-- 9001 和 port 要对应 -->
cluster-config-file nodes-9001.conf
cluster-node-timeout 15000
appendonly yes

创建数据目录
mkdir /usr/local/redis-cluster/9001/data

2.5 基于 9001 节点复制出其他的节点

cp -r /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9002/
cp -r /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9003/
cp -r /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9004/
cp -r /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9005/
cp -r /usr/local/redis-cluster/9001/* /usr/local/redis-cluster/9006/

sed -i 's/9001/9002/g' /usr/local/redis-cluster/9002/redis.conf
sed -i 's/9001/9003/g' /usr/local/redis-cluster/9003/redis.conf
sed -i 's/9001/9004/g' /usr/local/redis-cluster/9004/redis.conf
sed -i 's/9001/9005/g' /usr/local/redis-cluster/9005/redis.conf
sed -i 's/9001/9006/g' /usr/local/redis-cluster/9006/redis.conf

2.6 启动 6 个节点

vi /usr/local/redis-cluster/bin/start-redis-cluster.sh

#!/bin/bash
/usr/local/redis-cluster/bin/redis-server /usr/local/redis-cluster/9001/redis.conf
/usr/local/redis-cluster/bin/redis-server /usr/local/redis-cluster/9002/redis.conf
/usr/local/redis-cluster/bin/redis-server /usr/local/redis-cluster/9003/redis.conf
/usr/local/redis-cluster/bin/redis-server /usr/local/redis-cluster/9004/redis.conf
/usr/local/redis-cluster/bin/redis-server /usr/local/redis-cluster/9005/redis.conf
/usr/local/redis-cluster/bin/redis-server /usr/local/redis-cluster/9006/redis.conf

chmod +x /usr/local/redis-cluster/bin/start-redis-cluster.sh
/usr/local/redis-cluster/bin/start-redis-cluster.sh

2.7 安装高版本 ruby

yum install -y centos-release-scl-rh
yum install -y rh-ruby24
scl enable rh-ruby24 bash

2.8 安装集群所需软件

gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
sudo gem install redis (依赖版本 ruby>=2.3.0)

2.9 启动集群

/usr/local/redis-cluster/bin/redis-cli --cluster create 172.18.100.177:9001 172.18.100.177:9002 172.18.100.177:9003 172.18.100.177:9004 172.18.100.177:9005 172.18.100.177:9006 --cluster-replicas 1

3. 验证

3.1 一个节点上写

/usr/local/redis-cluster/bin/redis-cli -h 172.18.100.177 -p 9001 -c

set key1 val1
exit

3.2 另一个节点上读

/usr/local/redis-cluster/bin/redis-cli -h 172.18.100.177 -p 9002 -c

get key1