首先，本篇要基于单实例的安装，你的机器上已经有一个Redis
https://gper.club/articles/7e7e7f7ff7g5egc4g6b
为了节省机器，我们直接把6个Redis实例安装在同一台机器上（3主3从），只是使用不同的端口号。
机器IP 192.168.8.207
cd /usr/local/soft/redis-5.0.5
mkdir redis-cluster
cd redis-cluster
mkdir 7291 7292 7293 7294 7295 7296
复制redis配置文件到7291目录
cp /usr/local/soft/redis-5.0.5/redis.conf /usr/local/soft/redis-5.0.5/redis-cluster/7291
修改7291的配置文件
port 7291
dir /usr/local/soft/redis-5.0.5/redis-cluster/7291/
cluster-enabled yes
cluster-config-file nodes-7291.conf
cluster-node-timeout 5000
appendonly yes
pidfile /var/run/redis_7291.pid
把7291下的redis.conf复制到其他5个目录。
cd /usr/local/soft/redis-5.0.5/redis-cluster/7291
cp redis.conf ../7292
cp redis.conf ../7293
cp redis.conf ../7294
cp redis.conf ../7295
cp redis.conf ../7296
批量替换内容
cd /usr/local/soft/redis-5.0.5/redis-cluster
sed -i 's/7291/7292/g' 7292/redis.conf
sed -i 's/7291/7293/g' 7293/redis.conf
sed -i 's/7291/7294/g' 7294/redis.conf
sed -i 's/7291/7295/g' 7295/redis.conf
sed -i 's/7291/7296/g' 7296/redis.conf
安装ruby依赖、rubygems依赖、gem-redis依赖
yum install ruby -y
yum install rubygems -y
gem install redis -v 3.0.7
启动6个Redis节点
cd /usr/local/soft/redis-5.0.5/
./src/redis-server redis-cluster/7291/redis.conf
./src/redis-server redis-cluster/7292/redis.conf
./src/redis-server redis-cluster/7293/redis.conf
./src/redis-server redis-cluster/7294/redis.conf
./src/redis-server redis-cluster/7295/redis.conf
./src/redis-server redis-cluster/7296/redis.conf
是否启动了6个进程
ps -ef|grep redis
创建集群
旧版本中的redis-trib.rb已经废弃了，直接用–cluster命令
注意用绝对IP，不要用127.0.0.1
cd /usr/local/soft/redis-5.0.5/src/
redis-cli --cluster create 192.168.8.207:7291 192.168.8.207:7292 192.168.8.207:7293 192.168.8.207:7294 192.168.8.207:7295 192.168.8.207:7296 --cluster-replicas 1
Redis会给出一个预计的方案，对6个节点分配3主3从，如果认为没有问题，输入yes确认
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 127.0.0.1:7295 to 127.0.0.1:7291
Adding replica 127.0.0.1:7296 to 127.0.0.1:7292
Adding replica 127.0.0.1:7294 to 127.0.0.1:7293
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: dfdc9c0589219f727e4fd0ad8dafaf7e0cfb4f1c 127.0.0.1:7291
slots:[0-5460] (5461 slots) master
M: 8c878b45905bba3d7366c89ec51bd0cd7ce959f8 127.0.0.1:7292
slots:[5461-10922] (5462 slots) master
M: aeeb7d7076d9b25a7805ac6f508497b43887e599 127.0.0.1:7293
slots:[10923-16383] (5461 slots) master
S: ebc479e609ff8f6ca9283947530919c559a08f80 127.0.0.1:7294
replicates aeeb7d7076d9b25a7805ac6f508497b43887e599
S: 49385ed6e58469ef900ec48e5912e5f7b7505f6e 127.0.0.1:7295
replicates dfdc9c0589219f727e4fd0ad8dafaf7e0cfb4f1c
S: 8d6227aefc4830065624ff6c1dd795d2d5ad094a 127.0.0.1:7296
replicates 8c878b45905bba3d7366c89ec51bd0cd7ce959f8
Can I set the above configuration? (type 'yes' to accept):
注意看slot的分布：
7291 [0-5460] (5461个槽)
7292 [5461-10922] (5462个槽)
7293 [10923-16383] (5461个槽)
集群创建完成
>>> 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 127.0.0.1:7291)
M: dfdc9c0589219f727e4fd0ad8dafaf7e0cfb4f1c 127.0.0.1:7291
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 8c878b45905bba3d7366c89ec51bd0cd7ce959f8 127.0.0.1:7292
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
M: aeeb7d7076d9b25a7805ac6f508497b43887e599 127.0.0.1:7293
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: 8d6227aefc4830065624ff6c1dd795d2d5ad094a 127.0.0.1:7296
slots: (0 slots) slave
replicates aeeb7d7076d9b25a7805ac6f508497b43887e599
S: ebc479e609ff8f6ca9283947530919c559a08f80 127.0.0.1:7294
slots: (0 slots) slave
replicates dfdc9c0589219f727e4fd0ad8dafaf7e0cfb4f1c
S: 49385ed6e58469ef900ec48e5912e5f7b7505f6e 127.0.0.1:7295
slots: (0 slots) slave
replicates 8c878b45905bba3d7366c89ec51bd0cd7ce959f8
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
重置集群的方式是在每个节点上个执行cluster reset，然后重新创建集群
连接到客户端
redis-cli -p 7291
redis-cli -p 7292
redis-cli -p 7293
批量写入值
cd /usr/local/soft/redis-5.0.5/redis-cluster/
vim setkey.sh
脚本内容
#!/bin/bash
for ((i=0;i<20000;i++))
do
echo -en "helloworld" | redis-cli -h 192.168.8.207 -p 7291 -c -x set name$i >>redis.log
done
chmod +x setkey.sh
./setkey.sh
每个节点分布的数据
127.0.0.1:7292> dbsize
(integer) 6683
127.0.0.1:7293> dbsize
(integer) 6665
127.0.0.1:7291> dbsize
(integer) 6652
其他命令，比如添加节点、删除节点，重新分布数据：
redis-cli --cluster help
Cluster Manager Commands:
create host1:port1 ... hostN:portN
--cluster-replicas
check host:port
--cluster-search-multiple-owners
info host:port
fix host:port
--cluster-search-multiple-owners
reshard host:port
--cluster-from
--cluster-to
--cluster-slots
--cluster-yes
--cluster-timeout
--cluster-pipeline
--cluster-replace
rebalance host:port
--cluster-weight
--cluster-use-empty-masters
--cluster-timeout
--cluster-simulate
--cluster-pipeline
--cluster-threshold
--cluster-replace
add-node new_host:new_port existing_host:existing_port
--cluster-slave
--cluster-master-id
del-node host:port node_id
call host:port command arg arg .. arg
set-timeout host:port milliseconds
import host:port
--cluster-from
--cluster-copy
--cluster-replace
help
For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.
附录：
集群命令
cluster info ：打印集群的信息
cluster nodes ：列出集群当前已知的所有节点（node），以及这些节点的相关信息。
cluster meet ：将 ip 和 port 所指定的节点添加到集群当中，让它成为集群的一份子。
cluster forget
cluster replicate
cluster saveconfig ：将节点的配置文件保存到硬盘里面。
槽slot命令
cluster addslots [slot …] ：将一个或多个槽（slot）指派（assign）给当前节点。
cluster delslots [slot …] ：移除一个或多个槽对当前节点的指派。
cluster flushslots ：移除指派给当前节点的所有槽，让当前节点变成一个没有指派任何槽的节点。
cluster setslot node
cluster setslot migrating
cluster setslot importing
cluster setslot stable ：取消对槽 slot 的导入（import）或者迁移（migrate）。
键命令
cluster keyslot ：计算键 key 应该被放置在哪个槽上。
cluster countkeysinslot ：返回槽 slot 目前包含的键值对数量。
cluster getkeysinslot ：返回 count 个 slot 槽中的键
转载出处：https://gper.club/articles/7e7e7f7ff7g5egc7g6d