http://blog.csdn.net/imxiangzi/article/details/52431729
http://www.2cto.com/kf/201701/586689.html
meet Not all 16384 slots are covered by nodes.
http://www.cnblogs.com/SailorXiao/p/5808872.html
Redis Cluster 理论知识
集群配置 https://blog.csdn.net/u012572955/article/details/53996107
全面剖析Redis Cluster原理和应用
两台服务器 192.168.67.129 192.168.67.131 port 6379 6380 6381 一共6个节点（集群最少要三个节点即三个主节点，主节点挂了从节点会接管，如果没有从节点那整个集群就fail了）
192.168.67.129:6379
192.168.67.129:6380
192.168.67.129:6381
192.168.67.131:6379
192.168.67.131:6380
192.168.67.131:6381
这样就会3主3从 3个主分配3份 slot 一共16384 slots被平均分三份 每个主分开负责一个区域 ，所以三个slots区域任何一个出问题集群都不能用了
slots:0-5460 (5461 slots) master
slots:10923-16383 (5461 slots) master
slots:5461-10922 (5462 slots) master
yum -y install gcc
cd /usr/local
wget http://download.redis.io/releases/redis-3.2.2.tar.gz
tar zxf redis-3.2.2.tar.gz
cd redis-3.2.2
make
make install
cd utils
./install_server.sh 接着下面一路回车
Welcome to the redis service installer
This script will help you easily set up a running redis server
Please select the redis port for this instance: [6379]
Selecting default: 6379
Please select the redis config file name [/etc/redis/6379.conf]
Selected default - /etc/redis/6379.conf
Please select the redis log file name [/var/log/redis_6379.log]
Selected default - /var/log/redis_6379.log
Please select the data directory for this instance [/var/lib/redis/6379]
Selected default - /var/lib/redis/6379
Please select the redis executable path [/usr/local/bin/redis-server]
Selected config:
Port : 6379
Config file : /etc/redis/6379.conf
Log file : /var/log/redis_6379.log
Data dir : /var/lib/redis/6379
Executable : /usr/local/bin/redis-server
Cli Executable : /usr/local/bin/redis-cli
Is this ok? Then press ENTER to go on or Ctrl-C to abort.
Copied /tmp/6379.conf => /etc/init.d/redis_6379
Installing service...
Successfully added to chkconfig!
Successfully added to runlevels 345!
Starting Redis server...
Installation successful!
修改 /etc/redis/6379.conf
daemonize yes 这样就可以默认启动就后台运行
[root@localhost redis]# ls
6379.conf 6380.conf 6381.conf 修改6380和6381相应内容 6379部分全部改成6380和6381就行了，参考如下
daemonize yes //redis后台运行 pidfile /var/run/redis_6380.pid //pidfile文件 port 6380 //端口 cluster-enabled yes //开启集群 把注释#去掉 cluster-config-file nodes_6380.conf //集群的配置 配置文件首次启动自动生成 cluster-node-timeout 5000 //请求超时 设置5秒够了 appendonly yes
# /usr/local/bin/redis-server /etc/redis/63xx 启动redis 6379 6380 6381
# ps -ef |grep redis
root 1348 1 0 15:59 ? 00:00:12 /usr/local/bin/redis-server 192.168.67.129:6379 [cluster]
root 1743 1 0 16:01 ? 00:00:10 /usr/local/bin/redis-server 192.168.67.129:6381 [cluster]
root 1747 1 0 16:02 ? 00:00:10 /usr/local/bin/redis-server 192.168.67.129:6380 [cluster]
关闭redis
# pkill redis-server #正常停止Redis服务（一个服务器多个端口的几个redis-server全部都会被kill），可以通过pkill命令停止所有Redis服务或者使用kill -15 redis-pid停止某一个Redis服务。
用kill停止之后如果无法重新启动redis，那就cp一个新的配置文件然后再重启试试，最好别用kill
监控状态
# redis-cli -p 6379 monitor
OK
以上操作两台服务器都做了 ，接下来配置集群
yum -y install ruby ruby-devel rubygems rpm-build
gem install redis //等好久而且没有任何安装信息，久到你以为安装失败了，放着不管就可以了，十分钟后再说
# sudo gem install redis
Successfully installed redis-3.3.3
1 gem installed
Installing ri documentation for redis-3.3.3...
Installing RDoc documentation for redis-3.3.3...
运行 # redis-trib.rb 没报错就行了
[创建集群]# redis-trib.rb create --replicas 1 192.168.67.129:6379 192.168.67.129:6380 192.168.67.129:6381 192.168.67.131:6379 192.168.67.131:6380 192.168.67.131:6381
--replicas 1 表示我们希望为集群中的每个主节点创建一个从节点。
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.67.131:6379
192.168.67.129:6379
192.168.67.131:6380
Adding replica 192.168.67.129:6380 to 192.168.67.131:6379
Adding replica 192.168.67.131:6381 to 192.168.67.129:6379
Adding replica 192.168.67.129:6381 to 192.168.67.131:6380
M: c241982270411fc34cca6fb248c802f92a2bade2 192.168.67.129:6379
slots:5461-10922 (5462 slots) master
S: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
replicates 6a0da105d71714e4c2a9ef1bf8d4e421859bcbdc
S: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
replicates f4a2fb289b66107a046cc308df83ee0ddd59222e
M: 6a0da105d71714e4c2a9ef1bf8d4e421859bcbdc 192.168.67.131:6379
slots:0-5460 (5461 slots) master
M: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots:10923-16383 (5461 slots) master
S: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
replicates c241982270411fc34cca6fb248c802f92a2bade2
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 192.168.67.129:6379)
M: c241982270411fc34cca6fb248c802f92a2bade2 192.168.67.129:6379
slots:5461-10922 (5462 slots) master
M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots: (0 slots) master
replicates 6a0da105d71714e4c2a9ef1bf8d4e421859bcbdc
M: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
slots: (0 slots) master
replicates f4a2fb289b66107a046cc308df83ee0ddd59222e
M: 6a0da105d71714e4c2a9ef1bf8d4e421859bcbdc 192.168.67.131:6379
slots:0-5460 (5461 slots) master
M: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots:10923-16383 (5461 slots) master
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots: (0 slots) master
replicates c241982270411fc34cca6fb248c802f92a2bade2
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
# redis-trib.rb check 192.168.67.129:6379 #查看集群状态 理论上三个port任意查一个结果都是一样的
>>> Performing Cluster Check (using node 192.168.67.129:6379)
S: c241982270411fc34cca6fb248c802f92a2bade2 192.168.67.129:6379
slots: (0 slots) slave
replicates 129accd00021097ac0c0379b373c1b19de12b75c
S: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
slots: (0 slots) slave
replicates f4a2fb289b66107a046cc308df83ee0ddd59222e
M: 6a0da105d71714e4c2a9ef1bf8d4e421859bcbdc 192.168.67.131:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots: (0 slots) slave
replicates 6a0da105d71714e4c2a9ef1bf8d4e421859bcbdc
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots:5461-10922 (5462 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.
还以可以这么查
[root@localhost ~]# redis-cli -c -p 6381 cluster nodes
c241982270411fc34cca6fb248c802f92a2bade2 :0 slave,fail,noaddr 129accd00021097ac0c0379b373c1b19de12b75c 1503144886378 1503144886378 7 disconnected
429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380 master - 0 1503151926142 8 connected 0-5460
f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380 slave 341f7501a60b510b94159ef6667776e17ce3893d 0 1503151928162 10 connected
6a0da105d71714e4c2a9ef1bf8d4e421859bcbdc :0 master,fail,noaddr - 1503144886373 1503144886373 4 disconnected
129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381 myself,master - 0 0 7 connected 5461-10922
341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381 master - 0 1503151927654 10 connected 10923-16383
6499aa3e2dc11fba6cb88881132c80f17b2e3497 192.168.67.129:6379 slave 429e81bda0d58db69344eb080d6b8d2ed5c3beed 0 1503151927149 8 connected
# redis-cli -c -p 6380 #进入任何一台的端口 # redis-cli -c -h 192.168.67.131 -p 6381
127.0.0.1:6380> set hw "Hello World"
-> Redirected to slot [3315] located at 192.168.67.131:6379
OK
192.168.67.131:6379> get hw
"Hello World"
# redis-cli -c -p 6381
127.0.0.1:6381> get hw
-> Redirected to slot [3315] located at 192.168.67.131:6379
"Hello World"
pkill后遇到问题
>>> Creating cluster
[ERR] Node 192.168.67.131:6380 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
需要删除 redis.conf文件所在文件件下的aof、rdb、nodes.conf等文件 rm dump.rdb nodes-6379.conf nodes-6380.conf nodes-6381.conf
清空缓存
127.0.0.1:6381> flushdb
OK
如果还报错试试pkill之后重启再启动集群
重新创建集群的时候遇到问题
[root@localhost ~]# redis-trib.rb create --replicas 1 192.168.67.129:6379 192.168.67.129:6380 192.168.67.129:6381 192.168.67.131:6379 192.168.67.131:6380 192.168.67.131:6381
>>> Creating cluster #只要redis-trib.rb create一次就够了
[ERR] Node 192.168.67.129:6380 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
[root@localhost ~]# redis-trib.rb check 127.0.0.1:6379 #查6379发现这个节点单独成了一个master
>>> Performing Cluster Check (using node 127.0.0.1:6379)
M: fed9d4de4467764899959f6a779fbdc1fc5f657d 127.0.0.1:6379
slots: (0 slots) master
0 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[ERR] Not all 16384 slots are covered by nodes.
查其他节点发现 6个节点有三个是主1个从，剩下两个从说明有问题 都是6379出的问题
[root@localhost ~]# redis-trib.rb check 192.168.67.131:6381
>>> Performing Cluster Check (using node 192.168.67.131:6381)
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots:5461-10922 (5462 slots) master
0 additional replica(s)
M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots:0-5460 (5461 slots) master
0 additional replica(s)
S: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots: (0 slots) slave
replicates 341f7501a60b510b94159ef6667776e17ce3893d
M: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
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.
[root@localhost ~]# redis-cli -c -p 6379 cluster nodes
fed9d4de4467764899959f6a779fbdc1fc5f657d 192.168.67.131:6379 myself,master - 0 0 0 connected
[root@localhost ~]# redis-cli -c -p 6380 cluster nodes
c241982270411fc34cca6fb248c802f92a2bade2 :0 slave,fail,noaddr 129accd00021097ac0c0379b373c1b19de12b75c 1503144886358 1503144886358 7 disconnected
341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381 master - 0 1503147664318 10 connected 10923-16383
6a0da105d71714e4c2a9ef1bf8d4e421859bcbdc :0 master,fail,noaddr - 1503144886358 1503144886358 4 disconnected
129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381 master - 0 1503147663810 7 connected 5461-10922
429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380 master - 0 1503147664823 8 connected 0-5460
f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380 myself,slave 341f7501a60b510b94159ef6667776e17ce3893d 0 0 5 connected
[root@localhost ~]# redis-cli -p 6379
127.0.0.1:6379> set zzx zhan
(error) CLUSTERDOWN Hash slot not served
#连接有问题的节点发现无法正常使用 连接6379以外的端口发现set get正常 说明当前集群的两个6379节点有问题 剩下的4个节点正常，需要把有问题的节点重新加到集群中
参考了这篇http://www.cnblogs.com/guxiong/p/6266890.html里面的meet
[root@localhost ~]# redis-cli -c -h 192.168.67.129 -p 6379 cluster meet 192.168.67.131 6380
OK
[root@localhost ~]# redis-trib.rb check 127.0.0.1:6379
>>> Performing Cluster Check (using node 127.0.0.1:6379)
S: 6499aa3e2dc11fba6cb88881132c80f17b2e3497 127.0.0.1:6379
slots: (0 slots) slave
replicates 429e81bda0d58db69344eb080d6b8d2ed5c3beed
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots:5461-10922 (5462 slots) master
0 additional replica(s)
S: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots: (0 slots) slave
replicates 341f7501a60b510b94159ef6667776e17ce3893d
M: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots:0-5460 (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.
meet后把一个6379重新加进去了 剩下一个 redis-cli -c -h 192.168.67.131 -p 6379 cluster meet 192.168.67.131 6380 这下全部6个节点都正常了
done！！！
[root@localhost ~]# redis-trib.rb check 127.0.0.1:6379
>>> Performing Cluster Check (using node 127.0.0.1:6379)
M: fed9d4de4467764899959f6a779fbdc1fc5f657d 127.0.0.1:6379
slots: (0 slots) master
0 additional replica(s)
S: 6499aa3e2dc11fba6cb88881132c80f17b2e3497 192.168.67.129:6379
slots: (0 slots) slave
replicates 429e81bda0d58db69344eb080d6b8d2ed5c3beed
M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots: (0 slots) slave
replicates 341f7501a60b510b94159ef6667776e17ce3893d
M: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots:5461-10922 (5462 slots) master
0 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
发现多了一个 127.0.0.1:6379
[root@localhost ~]# redis-trib.rb del-node 127.0.0.1:6379 'fed9d4de4467764899959f6a779fbdc1fc5f657d'
>>> Removing node fed9d4de4467764899959f6a779fbdc1fc5f657d from cluster 127.0.0.1:6379
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
[重启脚本]# cat restart_redis
#/bin/bash
pkill redis-server
sleep 0.1
for ((i=1;i<=5;i++));do
sum=`ps -ef |grep "redis-server"|grep -v grep|wc -l`
if [ $sum == 0 ];
then
echo "killed redis-server"
rm -rf /etc/redis/dump.rdb /etc/redis/nodes-*.conf
echo "ready to start redis"
#sleep 1
redis-server /etc/redis/6379.conf
redis-server /etc/redis/6380.conf
redis-server /etc/redis/6381.conf
echo "started redis"
ps -ef |grep "redis-server"|grep -v grep
echo "end!!"
exit 0
else
echo "$i sleep"
sleep 1
fi
done
echo "have $sum redis-server not be killed,please check the result "
exit 1
重启检查集群发现[WARNING] Node 127.0.0.1:6379 has slots in importing state (1988). 参考http://blog.csdn.net/imxiangzi/article/details/52431729
如发现如下这样的错误：
[WARNING] Node 192.168.0.11:6380 has slots in migrating state (5461).
[WARNING] The following slots are open: 5461
可以使用redis命令取消slots迁移（5461为slot的ID）：
cluster setslot 5461 stable
需要注意，须登录到192.168.0.11:6380上执行redis的setslot子命令。
[root@localhost ~]# redis-trib.rb check 127.0.0.1:6379
>>> Performing Cluster Check (using node 127.0.0.1:6379)
M: fed9d4de4467764899959f6a779fbdc1fc5f657d 127.0.0.1:6379
slots: (0 slots) master
0 additional replica(s)
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots:5461-10922 (5462 slots) master
0 additional replica(s)
M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots: (0 slots) slave
replicates 341f7501a60b510b94159ef6667776e17ce3893d
M: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 6499aa3e2dc11fba6cb88881132c80f17b2e3497 192.168.67.129:6379
slots: (0 slots) slave
replicates 429e81bda0d58db69344eb080d6b8d2ed5c3beed
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
[WARNING] Node 127.0.0.1:6379 has slots in importing state (1988).
[WARNING] Node 192.168.67.131:6381 has slots in importing state (1988).
[WARNING] Node 192.168.67.129:6381 has slots in importing state (1988).
[WARNING] The following slots are open: 1988
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@localhost ~]# redis-cli -p 6381
127.0.0.1:6381> cluster setslot 1988 stable
OK
127.0.0.1:6381> exit
最后检查发现有一个主应该设置成从
[root@localhost redis]# redis-trib.rb check 127.0.0.1:6379
>>> Performing Cluster Check (using node 127.0.0.1:6379)
M: cd3f4079f866560cbcf4149f6181dc19e8880b91 127.0.0.1:6379
slots: (0 slots) master
0 additional replica(s)
M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots: (0 slots) slave
replicates 341f7501a60b510b94159ef6667776e17ce3893d
M: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots:5461-10922 (5462 slots) master
0 additional replica(s)
S: 6499aa3e2dc11fba6cb88881132c80f17b2e3497 192.168.67.129:6379
slots: (0 slots) slave
replicates 429e81bda0d58db69344eb080d6b8d2ed5c3beed
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
注意7006是新增的节点，而7000是已存在的节点（可为master或slave）。如果需要将7006变成某master的slave节点，执行命令：
[root@localhost redis]# redis-cli -p 6379
127.0.0.1:6379> cluster replicate 129accd00021097ac0c0379b373c1b19de12b75c
OK
再检查，集群正常（注意：不能为一个非空并且分配了slot的主节点继续添加从节点）
[root@localhost redis]# redis-cli -p 6379
127.0.0.1:6379> set abc wsj
(error) MOVED 7638 192.168.67.131:6381
127.0.0.1:6379> get zzx
(error) MOVED 1988 192.168.67.129:6380
出现MOVED是因为代码写错了 少了-c 应该是redis-cli -c -p 6381
搭建集群比较简单，搭建好后出现的问题：
1、本来一主一从变成两个主，就要把其中一个主变成从（登录到相应节点 cluster replicate ID）
2、集群中少了一个节点，要把节点重新加到集群中（ redis-cli -c -h 192.168.67.131 -p 6379 cluster meet 192.168.67.131 6380 ）
3、检查集群状态发现 "[WARNING] Node 127.0.0.1:6379 has slots in importing state (1988)." (登录相应节点 cluster setslot 1988 stable)
4、重启服务器后发现只有6379自动启动 检查集群发现6380 6381报错 因为没启动 运行 启动相应port后再检查集群就正常起来了，可能会报has slots in importing state。
6个节点增加到8个
复制redis.conf文件，然后启动redis 这里用6382.conf，再往集群中添加节点
添加节点
redis-trib.rb add-node 192.168.67.131:6382 192.168.67.129:6379 #前面写要添加的节点，后面一个任意集群中一个节点都行
[root@localhost redis]# redis-trib.rb add-node 192.168.67.131:6382 192.168.67.129:6379 >>> Adding node 192.168.67.131:6382 to cluster 192.168.67.129:6379 >>> Performing Cluster Check (using node 192.168.67.129:6379) S: 6499aa3e2dc11fba6cb88881132c80f17b2e3497 192.168.67.129:6379 slots: (0 slots) slave replicates 429e81bda0d58db69344eb080d6b8d2ed5c3beed M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380 slots:0-5460 (5461 slots) master 1 additional replica(s) S: 2ee98237ff31b5cad0fbaff9f0faccda50f46707 192.168.67.129:6382 slots: (0 slots) slave replicates fed9d4de4467764899959f6a779fbdc1fc5f657d M: fed9d4de4467764899959f6a779fbdc1fc5f657d 192.168.67.131:6379 slots: (0 slots) master 1 additional replica(s) M: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380 slots: (0 slots) slave replicates 341f7501a60b510b94159ef6667776e17ce3893d M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381 slots:5461-10922 (5462 slots) master 0 additional replica(s) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Send CLUSTER MEET to node 192.168.67.131:6382 to make it join the cluster. [OK] New node added correctly.
[root@localhost redis]# redis-cli -c -h 192.168.67.129 -p 6382
192.168.67.129:6382> cluster replicate 129accd00021097ac0c0379b373c1b19de12b75c
OK
192.168.67.129:6382> exit #再设置从节点
设置失败 提示被设置的主节点非空（不能为一个非空并且分配了slot的主节点继续添加从节点）
[root@localhost redis]# redis-cli -c -h 192.168.67.131 -p 6379 192.168.67.131:6379> cluster replicate 429e81bda0d58db69344eb080d6b8d2ed5c3beed (error) ERR To set a master the node must be empty and without assigned slots. 192.168.67.131:6379> exit
那就要删除主节点（429e81bda0d58db69344eb080d6b8d2ed5c3beed）的slot（就是移除slot给其他节点 有多少移动多少）
[root@localhost ~]# redis-trib.rb reshard 127.0.0.1:6382 #这个端口任意一个都行
>>> Performing Cluster Check (using node 127.0.0.1:6382)
S: 2ee98237ff31b5cad0fbaff9f0faccda50f46707 127.0.0.1:6382
slots: (0 slots) slave
replicates 129accd00021097ac0c0379b373c1b19de12b75c
M: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots:0-1987,1989-2729,5461-8191,10923-16383 (10921 slots) master
1 additional replica(s)
M: fed9d4de4467764899959f6a779fbdc1fc5f657d 192.168.67.131:6379
slots:1988 (1 slots) master #把1988给131:6380
1 additional replica(s)
M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots: (0 slots) master
1 additional replica(s)
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots:2730-5460,8192-10922 (5462 slots) master
1 additional replica(s)
S: 6499aa3e2dc11fba6cb88881132c80f17b2e3497 192.168.67.129:6379
slots: (0 slots) slave
replicates fed9d4de4467764899959f6a779fbdc1fc5f657d
S: ad1bae36b72d5db11a505080da5e6ae3b1c56810 192.168.67.131:6382
slots: (0 slots) slave
replicates 429e81bda0d58db69344eb080d6b8d2ed5c3beed
S: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
slots: (0 slots) slave
replicates f4a2fb289b66107a046cc308df83ee0ddd59222e
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 1
What is the receiving node ID? f4a2fb289b66107a046cc308df83ee0ddd59222e
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:fed9d4de4467764899959f6a779fbdc1fc5f657d
Source node #2:done
Ready to move 1 slots.
Source nodes:
M: fed9d4de4467764899959f6a779fbdc1fc5f657d 192.168.67.131:6379
slots:1988 (1 slots) master
1 additional replica(s)
Destination node:
M: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots:0-1987,1989-2729,5461-8191,10923-16383 (10921 slots) master
1 additional replica(s)
Resharding plan:
Moving slot 1988 from fed9d4de4467764899959f6a779fbdc1fc5f657d
Do you want to proceed with the proposed reshard plan (yes/no)? yes
cluster replicate 的时候报错
自动调整rebalance
[root@localhost ~]# redis-trib.rb rebalance 192.168.67.129:6379 >>> Performing Cluster Check (using node 192.168.67.129:6379) [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Rebalancing across 3 nodes. Total weight = 3 Moving 5460 slots from 192.168.67.131:6380 to 192.168.67.131:6379 ################################################ Moving 1 slots from 192.168.67.131:6381 to 192.168.67.131:6379 #
[root@localhost ~]# redis-trib.rb check 127.0.0.1:6379
>>> Performing Cluster Check (using node 127.0.0.1:6379)
S: 6499aa3e2dc11fba6cb88881132c80f17b2e3497 127.0.0.1:6379
slots: (0 slots) slave
replicates fed9d4de4467764899959f6a779fbdc1fc5f657d
S: 341f7501a60b510b94159ef6667776e17ce3893d 192.168.67.129:6381
slots: (0 slots) slave
replicates f4a2fb289b66107a046cc308df83ee0ddd59222e
M: fed9d4de4467764899959f6a779fbdc1fc5f657d 192.168.67.131:6379
slots:0-2730,5461-8191 (5462 slots) master
1 additional replica(s)
S: 2ee98237ff31b5cad0fbaff9f0faccda50f46707 192.168.67.129:6382
slots: (0 slots) slave
replicates 129accd00021097ac0c0379b373c1b19de12b75c
M: f4a2fb289b66107a046cc308df83ee0ddd59222e 192.168.67.131:6380
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 429e81bda0d58db69344eb080d6b8d2ed5c3beed 192.168.67.129:6380
slots: (0 slots) master
1 additional replica(s)
S: ad1bae36b72d5db11a505080da5e6ae3b1c56810 192.168.67.131:6382
slots: (0 slots) slave
replicates 429e81bda0d58db69344eb080d6b8d2ed5c3beed
M: 129accd00021097ac0c0379b373c1b19de12b75c 192.168.67.131:6381
slots:2731-5460,8192-10922 (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.
rebalance 之后有一个M没有slots，还是需要手动调整才行
要把一个主变成从（或者从变主）有两种方法，第一种就是kill掉主 这样方法可能会丢失数据 因为主从切换需要时间（
Redis 集群的一致性保证(Redis Cluster consistency guarantees)
Redis 集群不保证强一致性。实践中，这意味着在特定的条件下，Redis 集群可能会丢掉一些被系统收 到的写入请求命令。
Redis 集群为什么会丢失写请求的第一个原因，是因为采用了异步复制。这意味着在写期间下面的事情 发生了：
你的客户端向主服务器 B 写入。
主服务器 B 回复 OK 给你的客户端。
主服务器 B 传播写入操作到其从服务器 B1，B2 和 B3。
）
第二种就是用CLUSTER FAILOVER 命令 这里需要登录从然后输入命令 就能把对应的主换成从了，这种方法不会丢数据
获取所有 redis的key
192.168.67.131:6379> keys *
1) "lqq"
2) "zzx"
3) "0904"
redis-cli 中。 使用命令 info Keyspace
查看存储数据的相关信息。
通过 keys * 查看所有的 key，想要释放掉的话可以删除Key来释放，
删除单个：del key
redis 2.8.9安装
[root@tomcat1 redis-2.8.9]# tar zxf redis-2.8.9.tar.gz
[root@tomcat1 redis-2.8.9]# cd redis-2.8.9
[root@tomcat1 redis-2.8.9]# make
[root@tomcat1 redis-2.8.9]# make install
[root@tomcat1 redis-2.8.9]# cd utils/
[root@tomcat1 utils]# ./install_server.sh 路回车
[root@tomcat1 redis-2.8.9]# ./redis-server redis.conf 直接启动redis
redis-server：Redis服务器的daemon启动程序
redis-cli：Redis命令行操作工具。当然，你也可以用telnet根据其纯文本协议来操作
redis-benchmark：Redis性能测试工具，测试Redis在你的系统及你的配置下的读写性能
redis-check-aof：更新日志检查
配置文件内容如下
[root@redis1 ~]# grep -v "^#" redis.conf|grep -v "^$"
[root@redis1 redis-3.2.1]# grep -v "^#" redis.conf|grep -v "^$"
主
bind 192.168.1.8 127.0.0.1
daemonize yes
port 6379
从
bind 192.168.1.9 127.0.0.1
port 6389
daemonize yes
slaveof 192.168.1.8 6379