Redis集群搭建

1. 下载redis包
   http://download.redis.io/releases/redis-5.0.5.tar.gz

2. 安装gcc包

yum install -y gcc-c++

3. 各自安装redis

tar -zxvf redis-5.0.5.tar.gz && cd redis-5.0.5 && make && make install PREFIX=/usr/local/redis

4. 配置redis

cd .. && mkdir /usr/local/redis/etc && cp redis.conf /usr/local/redis/etc && mkdir -p /data/db/redis/ && cd /usr/local/redis/etc && vim redis.conf

port  6379
bind 0.0.0.0
protected-mode  no
daemonize    yes
pidfile  /var/run/redis_7000.pid
cluster-enabled  yes
cluster-config-file  nodes_7000.conf
cluster-node-timeout  15000
appendonly  yes
logfile /data/logs/redis.log
dir /data/db/redis/

5. 复制redis-trib.rb文件

cp /data/software/redis/redis-5.0.5/src/redis-trib.rb /usr/local/redis/bin/

6. 启动各个Redis节点

/usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf

7. 查看启动日志

cat /data/logs/redis.log

8. 创建集群

/usr/local/redis/bin/redis-cli --cluster create 10.154.8.208:6379 10.154.8.149:6379 10.154.8.18:6379 10.154.8.130:6379 10.154.8.112:6379 10.154.8.113:6379 --cluster-replicas 1

---

其他命令

1. 添加新主节点

redis-cli --cluster add-node new_host:new_port existing_host:existing_port --cluster-master-id node_id

2. hash槽重新分配
   添加完新节点后，需要对新添加的主节点进行hash槽重新分配，这样该主节点才能存储数据，redis共有16384个槽。

redis-cli --cluster reshard host:port --cluster-from node_id --cluster-to node_id --cluster-slots <args> --cluster-yes

3. 添加新从节点

redis-cli --cluster add-node new_host:new_port existing_host:existing_port --cluster-slave --cluster-master-id node_id

4. 删除节点

redis-cli --cluster  del-node host:port node_id