Mac 单机安装Redis Cluster（3主3从）

配置文件准备

3主3从一共6个redis 服务

每个文件夹放入一个 redis.conf 文件
端口按文件夹替换

port 7291
daemonize yes
protected-mode no
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

如果是外网要加如下配置：

cluster-announce-ip 479.xx.xx.xx
# 节点映射端口
cluster-announce-port ${PORT}
# 节点总线端口
cluster-announce-bus-port 1${PORT}

启动脚本

redis-server 7291/redis.conf
redis-server 7292/redis.conf
redis-server 7293/redis.conf
redis-server 7294/redis.conf
redis-server 7295/redis.conf
redis-server 7296/redis.conf

检查启动完成的进程

ps -ef|grep redis

创建集群：
ip 不要使用 127.0.0.1

redis-cli --cluster create 192.168.1.149:7291 192.168.1.149:7292 192.168.1.149:7293 192.168.1.149:7294 192.168.1.149:7295 192.168.1.149:7296 --cluster-replicas 1

redis 会给个预计的方案，6个节点分配3主3从，输入 yes 确认。

槽分布：
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383

zhangburui@ZPR-MacBook-Pro cluster % redis-cli --cluster create 192.168.1.149:7291 192.168.1.149:7292 192.168.1.149:7293 192.168.1.149:7294 192.168.1.149:7295 192.168.1.149:7296 --cluster-replicas 1
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.1.149:7295 to 192.168.1.149:7291
Adding replica 192.168.1.149:7296 to 192.168.1.149:7292
Adding replica 192.168.1.149:7294 to 192.168.1.149:7293
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: c000a3cb2c201baacdb83601deb31a0b299a076e 192.168.1.149:7291
   slots:[0-5460] (5461 slots) master
M: 97abcc039fc30ee6ae3a06fed3d1705b4b481299 192.168.1.149:7292
   slots:[5461-10922] (5462 slots) master
M: dba3eb1bf1b112ace17697ad4f9ef5f5270e8e42 192.168.1.149:7293
   slots:[10923-16383] (5461 slots) master
S: 1117229f2084c42cd964ca84f3224a46cc06b24c 192.168.1.149:7294
   replicates 97abcc039fc30ee6ae3a06fed3d1705b4b481299
S: ecf5e306ca20ed285517880e128dcef8c6815245 192.168.1.149:7295
   replicates dba3eb1bf1b112ace17697ad4f9ef5f5270e8e42
S: b0d9777198b373a6c52c7738d409b6f305f382db 192.168.1.149:7296
   replicates c000a3cb2c201baacdb83601deb31a0b299a076e
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 192.168.1.149:7291)
M: c000a3cb2c201baacdb83601deb31a0b299a076e 192.168.1.149:7291
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: b0d9777198b373a6c52c7738d409b6f305f382db 192.168.1.149:7296
   slots: (0 slots) slave
   replicates c000a3cb2c201baacdb83601deb31a0b299a076e
S: 1117229f2084c42cd964ca84f3224a46cc06b24c 192.168.1.149:7294
   slots: (0 slots) slave
   replicates 97abcc039fc30ee6ae3a06fed3d1705b4b481299
M: 97abcc039fc30ee6ae3a06fed3d1705b4b481299 192.168.1.149:7292
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: ecf5e306ca20ed285517880e128dcef8c6815245 192.168.1.149:7295
   slots: (0 slots) slave
   replicates dba3eb1bf1b112ace17697ad4f9ef5f5270e8e42
M: dba3eb1bf1b112ace17697ad4f9ef5f5270e8e42 192.168.1.149:7293
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
[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

测试脚本：

#!/bin/bash
for ((i=0;i<20000;i++))
do
echo -en "helloworld" | redis-cli -h 192.168.1.149 -p 7291 -c -x set name$i >>redis.log
done

chmod 777 testsetkey.sh
./testsetkey.sh

部分 key 可以插入进去，后续出现下面的问题。

但是 Cluster 是成功了。
查看各个节点的key 分布情况

127.0.0.1:7292> dbsize
(integer) 6683
127.0.0.1:7293> dbsize
(integer) 6665
127.0.0.1:7291> dbsize
(integer) 6652

出现如下问题?

Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address
Could not connect to Redis at 192.168.1.149:7291: Can't assign requested address

对redis连续进行50000访问，却出现以了Cannot assignrequestedaddress的问题，我起先是以为是redis的问题（可能承受不了这么多访问量），可是redis被大家吹的那么NB，不会出现这么SB的问题吧，于是google之,发现原来是：

客户端频繁的连服务器，由于每次连接都在很短的时间内结束，导致很多的TIME_WAIT，以至于用光了可用的端口号，所以新的连接没办法绑定端口，即“Cannot assign requestedaddress”。是客户端的问题不是服务器端的问题。通过netstat，的确看到很多TIME_WAIT状态的连接。
从网上找了解决办法：
执行命令修改如下2个内核参数
sysctl -w net.ipv4.tcp_timestamps=1 开启对于TCP时间戳的支持,若该项设置为0，则下面一项设置不起作用

sysctl -w net.ipv4.tcp_tw_recycle=1 表示开启TCP连接中TIME-WAIT sockets的快速回收

类型	命令
集群	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。
节点	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 <node_id> ：从集群中移除 node_id 指定的节点(保证空槽道)。 cluster replicate <node_id> ：将当前节点设置为 node_id 指定的节点的从节点。 cluster saveconfig ：将节点的配置文件保存到硬盘里面。
槽(slot)	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 <node_id> ：将槽 slot 指派给 node_id 指定的节点，如果槽已经指派给另一个节点，那么先让另一个节点删除该槽>，然后再进行指派。 cluster setslot migrating <node_id> ：将本节点的槽 slot 迁移到 node_id 指定的节点中。 cluster setslot importing <node_id> ：从 node_id 指定的节点中导入槽 slot 到本节点。 cluster setslot stable ：取消对槽 slot 的导入（import）或者迁移（migrate）。
键	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

目录CONTENT

Mac 单机安装Redis Cluster（3主3从）

配置文件准备

出现如下问题?

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