一、redis集群配置
port 7000
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes
二、安装ruby（ruby可以充当redis客户端的角色）
yum -y install ruby ruby-devel rubygems rpm-build
gem install redis
三、创建redis集群
1、依次启动node1:7000/7001, node2:7000/7001, node3:7000/7001
[root@node1 7000]# ../src/redis-server redis.conf
2、# 必须使用IP地址不能使用主机名
src/redis-trib.rb create --replicas 1 192.168.199.238:7000 192.168.199.238:7001 \
192.168.199.134:7000 192.168.199.134:7001 192.168.199.237:7000 192.168.199.237:7001
四、启动redis集群
1、 检查
[root@node1 redis]# src/redis-cli -c -h 192.168.0.31 -p 7000 cluster nodes
ebda3f1dad0da2996df119182eab46ed7abedcd9 192.168.0.35:7001 slave 490354a9f25120ee5ae10acc681dc412864ecb03 0 1522055848174 6 connected
490354a9f25120ee5ae10acc681dc412864ecb03 192.168.0.35:7000 master - 0 1522055850183 5 connected 10923-16383
d1a11bf4cc508a11f71d9a40e0aca6c7e491a3c4 192.168.0.33:7000 master - 0 1522055847170 3 connected 5461-10922
c9b21659527f7ce2f234102c4d6b6361e270e5a8 192.168.0.31:7001 slave d1a11bf4cc508a11f71d9a40e0aca6c7e491a3c4 0 1522055849178 3 connected
34604603c5b970b98f0d8351e8811f2688a9c83e 192.168.0.31:7000 myself,master - 0 0 1 connected 0-5460
22c867aa1f70b4cc0ea5c3ca011dd1a2df7da66e 192.168.0.33:7001 slave 34604603c5b970b98f0d8351e8811f2688a9c83e 0 1522055845161 4 connected
2、测试
[root@node1 redis]# src/redis-cli -c -h 192.168.0.31 -p 7000
五、集群扩容
1、增加主节点
新节点：192.168.0.31:7002
老节点：192.168.0.31:7000
src/redis-trib.rb add-node 192.168.0.31:7002 192.168.0.31:7000
2、增加从节点
新节点：192.168.0.31:7002
老节点：192.168.0.31:7000
src/redis-trib.rb add-node --slave --master-id 5da7b4b37f4e14638d9558e66166c042b752d417 192.168.0.31:7002 192.168.0.31:7000
六、redis 重新分配redis资源即重新分配槽位
老节点：192.168.0.31:7000
src/redis-trib.rb reshard 192.168.0.31:7000
How many slots do you want to move (from 1 to 16384)? 1000 //设置slot数1000
What is the receiving node ID? 03ccad2ba5dd1e062464bc7590400441fafb63f2 //新节点node id
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #1:all //表示全部节点重新洗牌
Do you want to proceed with the proposed reshard plan (yes/no)? yes //确认重新分
七、redis集群缩容
1、删除从节点
老节点：192.168.0.31:7001
src/redis-trib.rb del-node 192.168.0.31:7001 '9c240333476469e8e2c8e80b089c48f389827265'
2、删除主节点
- 删除从节点(注意：需要将从节点转移到其他主节点)
49ed626134079dc301f586ff4edb1670a3a42a8c 被删除主节点ID
192.168.0.31:7000> cluster replicate 49ed626134079dc301f586ff4edb1670a3a42a8c
3. 取消槽位
src/redis-trib.rb reshard 192.168.0.31:7000 // 重新分配槽位
How many slots do you want to move (from 1 to 16384)? 1000 // 被删除master的所有slot数量
What is the receiving node ID? 5d8ef5a7fbd72ac586bef04fa6de8a88c0671052 // 接收slot的master
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #1:49ed626134079dc301f586ff4edb1670a3a42a8c //被删除master的node-id
Source node #2:done
Do you want to proceed with the proposed reshard plan (yes/no)? yes // 取消slot后，reshard
3. 删除主节点
src/redis-trib.rb del-node 192.168.0.31:7000 '49ed626134079dc301f586ff4edb1670a3a42a8c'