Redis Cluster集群
Redis Cluster集群一、redis-cluster设计
Redis集群搭建的方式有多种，例如使用zookeeper等，但从redis 3.0之后版本支持redis-cluster集群，Redis-Cluster采用无中心结构，每个节点保存数据和整个集群状态,每个节点都和其他所有 节点连接。其redis-cluster架构图如下：
其结构特点：
1、所有的redis节点彼此互联(PING-PONG机制),内部使用二进制协议优化传输速度和带宽。
2、节点的fail是通过集群中超过半数的节点检测失效时才生效。
3、客户端与redis节点直连,不需要中间proxy层.客户端不需要连接集群所有节点,连接集群中任何一个可用节点即可。
4、redis-cluster把所有的物理节点映射到slot上（不一定是平均分配）,cluster 负责维护node<->slot<->value。
5、Redis集群预分好16384个桶，当需要在 Redis 集群中放置一个 key-value 时，根据 CRC16(key) mod 16384的值，决定将一个key放到哪个桶中。
1、redis cluster节点分配
现在我们是三个主节点分别是：A, B, C 三个节点，它们可以是一台机器上的三个端口，也可以是三台不同的服务器。那么，采用哈希槽 (hash slot)的方式来分配16384个slot 的话，它们三个节点分别承担的slot 区间是：
节点A覆盖0－5460;
节点B覆盖5461－10922;
节点C覆盖10923－16383.
获取数据：
如果存入一个值，按照redis cluster哈希槽的算法： CRC16('key')%16384 = 6782。 那么就会把这个key 的存储分配到 B 上了。同样，当我连接(A,B,C)任何一个节点想获取'key'这个key时，也会这样的算法，然后内部跳转到B节点上获取数据
新增一个主节点：
新增一个节点D，redis cluster的这种做法是从各个节点的前面各拿取一部分slot到D上，我会在接下来的实践中实验。大致就会变成这样：
节点A覆盖1365-5460
节点B覆盖6827-10922
节点C覆盖12288-16383
节点D覆盖0-1364,5461-6826,10923-12287
同样删除一个节点也是类似，移动完成后就可以删除这个节点了。
2、Redis Cluster主从模式
redis cluster 为了保证数据的高可用性，加入了主从模式，一个主节点对应一个或多个从节点，主节点提供数据存取，从节点则是从主节点拉取数据备份，当这个主节点挂掉后，就会有这个从节点选取一个来充当主节点，从而保证集群不会挂掉。
上面那个例子里, 集群有ABC三个主节点, 如果这3个节点都没有加入从节点，如果B挂掉了，我们就无法访问整个集群了。A和C的slot也无法访问。
所以我们在集群建立的时候，一定要为每个主节点都添加了从节点, 比如像这样, 集群包含主节点A、B、C, 以及从节点A1、B1、C1, 那么即使B挂掉系统也可以继续正确工作。
B1节点替代了B节点，所以Redis集群将会选择B1节点作为新的主节点，集群将会继续正确地提供服务。 当B重新开启后，它就会变成B1的从节点。
不过需要注意，如果节点B和B1同时挂了，Redis集群就无法继续正确地提供服务了。
二、redis集群的搭建
集群中至少应该有奇数个节点，所以至少有三个节点，每个节点至少有一个备份节点，所以下面使用6节点（主节点、备份节点由redis-cluster集群确定）。
下面使用redis-3.2.0安装，下载地址
1、安装redis节点指定端口
解压redis压缩包，编译安装
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[*]# tar xzf redis-3.2.0.tar.gz
[*]# cd redis-3.2.0
[*]# make
[*]# make install PREFIX=/usr/andy/redis-cluster
在redis-cluster下 修改bin文件夹为redis01,复制redis.conf配置文件
配置redis的配置文件redis.conf
daemonize yes #后台启动
port 7001 #修改端口号，从7001到7006
cluster-enabled yes #开启cluster，去掉注释
cluster-config-file nodes.conf
cluster-node-timeout 15000
appendonly yes
复制六份，修改对应的端口号
2、安装redis-trib所需的 ruby脚本
复制redis解压文件src下的redis-trib.rb文件到redis-cluster目录
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[*]# cp /usr/andy/redis/redis-3.2.0/src/redis-trib.rb ./
安装ruby环境：
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[*]# yum install ruby
[*]# yum install rubygems
安装redis-trib.rb运行依赖的ruby的包redis-3.2.2.gem，下载
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[*]# gem install redis-3.2.2.gem
3、启动所有的redis节点
可以写一个命令脚本start-all.sh
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[*]cd redis01
[*]./redis-server redis.conf
[*]cd ..
[*]cd redis02
[*]./redis-server redis.conf
[*]cd ..
[*]cd redis03
[*]./redis-server redis.conf
[*]cd ..
[*]cd redis04
[*]./redis-server redis.conf
[*]cd ..
[*]cd redis05
[*]./redis-server redis.conf
[*]cd ..
[*]cd redis06
[*]./redis-server redis.conf
[*]cd ..
设置权限启动
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[*]# chmod 777 start-all.sh
[*]# ./start-all.sh
查看redis进程启动状态
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[*]# ps -ef | grep redis
[*]
[*]root 4547 10 23:12 ? 00:00:00 ./redis-server 127.0.0.1:7001
[*]root 4551 10 23:12 ? 00:00:00 ./redis-server 127.0.0.1:7002
[*]root 4555 10 23:12 ? 00:00:00 ./redis-server 127.0.0.1:7003
[*]root 4559 10 23:12 ? 00:00:00 ./redis-server 127.0.0.1:7004
[*]root 4563 10 23:12 ? 00:00:00 ./redis-server 127.0.0.1:7005
[*]root 4567 10 23:12 ? 00:00:00 ./redis-server 127.0.0.1:7006
[*]root 4840 44210 23:26 pts/1 00:00:00 grep --color=auto redis
可以看到redis的6个节点已经启动成功
杀死全部的几点：
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[*]# pkill -9 redis
4、使用redis-trib.rb创建集群
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[*]./redis-trib.rb create --replicas 1 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006
使用create命令 --replicas 1 参数表示为每个主节点创建一个从节点，其他参数是实例的地址集合。
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[*]# ./redis-trib.rb create --replicas 1 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006
[*]>>> Creating cluster
[*]>>> Performing hash slots allocation on 6 nodes...
[*]Using 3 masters:
[*]127.0.0.1:7001
[*]127.0.0.1:7002
[*]127.0.0.1:7003
[*]Adding replica 127.0.0.1:7004 to 127.0.0.1:7001
[*]Adding replica 127.0.0.1:7005 to 127.0.0.1:7002
[*]Adding replica 127.0.0.1:7006 to 127.0.0.1:7003
[*]M: dfd510594da614469a93a0a70767ec9145aefb1a 127.0.0.1:7001
[*] slots:0-5460 (5461 slots) master
[*]M: e02eac35110bbf44c61ff90175e04d55cca097ff 127.0.0.1:7002
[*] slots:5461-10922 (5462 slots) master
[*]M: 4385809e6f4952ecb122dbfedbee29109d6bb234 127.0.0.1:7003
[*] slots:10923-16383 (5461 slots) master
[*]S: ec02c9ef3acee069e8849f143a492db18d4bb06c 127.0.0.1:7004
[*] replicates dfd510594da614469a93a0a70767ec9145aefb1a
[*]S: 83e5a8bb94fb5aaa892cd2f6216604e03e4a6c75 127.0.0.1:7005
[*] replicates e02eac35110bbf44c61ff90175e04d55cca097ff
[*]S: 10c097c429ca24f8720986c6b66f0688bfb901ee 127.0.0.1:7006
[*] replicates 4385809e6f4952ecb122dbfedbee29109d6bb234
[*]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 127.0.0.1:7001)
[*]M: dfd510594da614469a93a0a70767ec9145aefb1a 127.0.0.1:7001
[*] slots:0-5460 (5461 slots) master
[*]M: e02eac35110bbf44c61ff90175e04d55cca097ff 127.0.0.1:7002
[*] slots:5461-10922 (5462 slots) master
[*]M: 4385809e6f4952ecb122dbfedbee29109d6bb234 127.0.0.1:7003
[*] slots:10923-16383 (5461 slots) master
[*]M: ec02c9ef3acee069e8849f143a492db18d4bb06c 127.0.0.1:7004
[*] slots: (0 slots) master
[*] replicates dfd510594da614469a93a0a70767ec9145aefb1a
[*]M: 83e5a8bb94fb5aaa892cd2f6216604e03e4a6c75 127.0.0.1:7005
[*] slots: (0 slots) master
[*] replicates e02eac35110bbf44c61ff90175e04d55cca097ff
[*]M: 10c097c429ca24f8720986c6b66f0688bfb901ee 127.0.0.1:7006
[*] slots: (0 slots) master
[*] replicates 4385809e6f4952ecb122dbfedbee29109d6bb234
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
上面显示创建成功，有3个主节点，3个从节点，每个节点都是成功连接状态。
3个主节点以及分配的哈希卡槽如下：
M: dfd510594da614469a93a0a70767ec9145aefb1a 127.0.0.1:7001
slots:0-5460 (5461 slots) master
M: e02eac35110bbf44c61ff90175e04d55cca097ff 127.0.0.1:7002
slots:5461-10922 (5462 slots) master
M: 4385809e6f4952ecb122dbfedbee29109d6bb234 127.0.0.1:7003
slots:10923-16383 (5461 slots) master
3个从节点以及附属的主节点如下：
S: ec02c9ef3acee069e8849f143a492db18d4bb06c 127.0.0.1:7004
replicates dfd510594da614469a93a0a70767ec9145aefb1a
S: 83e5a8bb94fb5aaa892cd2f6216604e03e4a6c75 127.0.0.1:7005
replicates e02eac35110bbf44c61ff90175e04d55cca097ff
S: 10c097c429ca24f8720986c6b66f0688bfb901ee 127.0.0.1:7006
replicates 4385809e6f4952ecb122dbfedbee29109d6bb234
以上集群安装成功了，如果安装未成功报如下错误
>>> Creating cluster
Sorry, can't connect to node....
需要安装最新的ruby源码，下载
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[*]# tar -zxvf ruby-2.3.1.tar.gz
[*]# cd
[*]# ./configure --prefix=/usr/local/ruby-2.3.1
[*]# make && make install
[*]#gem install redis
还有一种情况是，在VMware做测试的时间（都在一台服务器时），ip应该使用127.0.0.1，如果使用局域网ip，也会报节点创建失败。
三、redis集群的测试
1、测试存取值
客户端连接集群redis-cli需要带上 -c ，redis-cli -c -p 端口号
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[*]# ./redis-cli -c -p 7001
[*]127.0.0.1:7001> set name andy
[*]-> Redirected to slot located at 127.0.0.1:7002
[*]OK
[*]127.0.0.1:7002> get name
[*]"andy"
[*]127.0.0.1:7002>
根据redis-cluster的key值分配，name应该分配到节点7002上，上面显示redis cluster自动从7001跳转到了7002节点。
我们可以测试一下7006从节点获取name值
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[*]# ./redis-cli -c -p 7006
[*]127.0.0.1:7006> get name
[*]-> Redirected to slot located at 127.0.0.1:7002
[*]"andy"
[*]127.0.0.1:7002>
7006位7003的从节点，从上面也是自动跳转至7002获取值，这也是redis cluster的特点，它是去中心化，每个节点都是对等的，连接哪个节点都可以获取和设置数据。
四、集群节点选举
现在模拟将7002节点挂掉，按照redis-cluster原理会选举会将 7002的从节点7005选举为主节点。
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[*]# ps -ef | grep redis
[*]root 7950 10 12:50 ? 00:00:28 ./redis-server 127.0.0.1:7001
[*]root 7952 10 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7002
[*]root 7956 10 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7003
[*]root 7960 10 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7004
[*]root 7964 10 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7005
[*]root 7966 10 12:50 ? 00:00:29 ./redis-server 127.0.0.1:7006
[*]root 11346105810 14:57 pts/2 00:00:00 grep --color=auto redis
[*]# kill 7952
在查看集群中的7002节点
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[*]#
[*]# ./redis-trib.rb check 127.0.0.1:7002
[*] Sorry, can't connect to node 127.0.0.1:7002
[*]# ./redis-trib.rb check 127.0.0.1:7005
[*]>>> Performing Cluster Check (using node 127.0.0.1:7005)
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:5461-10922 (5462 slots) master
[*] 0 additional replica(s)
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:10923-16383 (5461 slots) master
[*] 1 additional replica(s)
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:0-5460 (5461 slots) master
[*] 1 additional replica(s)
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
可以看到集群连接不了7002节点，而7005有原来的S转换为M节点，代替了原来的7002节点。我们可以获取name值：
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[*]# ./redis-cli -c -p 7001
[*]127.0.0.1:7001> get name
[*]-> Redirected to slot located at 127.0.0.1:7005
[*]"andy"
[*]127.0.0.1:7005>
[*]127.0.0.1:7005>
从7001节点连入，自动跳转到7005节点，并且获取name值。
现在我们将7002节点恢复，看是否会自动加入集群中以及充当的M还是S节点。
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[*]# cd redis02
[*]# ./redis-server redis.conf
[*]#
在check一下7002节点
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[*]# ./redis-trib.rb check 127.0.0.1:7002
[*]>>> Performing Cluster Check (using node 127.0.0.1:7002)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:10923-16383 (5461 slots) master
[*] 1 additional replica(s)
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:5461-10922 (5462 slots) master
[*] 1 additional replica(s)
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:0-5460 (5461 slots) master
[*] 1 additional replica(s)
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
可以看到7002节点变成了a5db243087d8bd423b9285fa8513eddee9bb59a6 7005的从节点。
五、集群节点添加
节点新增包括新增主节点、从节点两种情况。以下分别做一下测试：
1、新增主节点
新增一个节点7007作为主节点修改配置文件
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[*]# cp -rredis01 redis07
[*]# cd redis07/
[*]# sed -i "s/7001/7007/g" ./redis.conf
启动7007redis服务
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[*]# ./redis-server redis.conf
[*]# netstat -anp | grep 7007
[*]tcp 0 0 127.0.0.1:17007 0.0.0.0:* LISTEN 13441/./redis-serve
[*]tcp 0 0 127.0.0.1:7007 0.0.0.0:* LISTEN 13441/./redis-serve
[*]#
上面可以看到，7007已经启动，现在加入集群中。添加使用redis-trib.rb的add-node命令
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[*]./redis-trib.rb add-node 127.0.0.1:7007 127.0.0.1:7002
add-node是加入集群节点，127.0.0.1:7007为要加入的节点，127.0.0.1:7002 表示加入的集群的一个节点，用来辨识是哪个集群，理论上那个集群的节点都可以。
执行以下add-node
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[*]# ./redis-trib.rb add-node 127.0.0.1:7007 127.0.0.1:7002
[*]>>> Adding node 127.0.0.1:7007 to cluster 127.0.0.1:7002
[*]>>> Performing Cluster Check (using node 127.0.0.1:7002)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:10923-16383 (5461 slots) master
[*] 1 additional replica(s)
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:5461-10922 (5462 slots) master
[*] 1 additional replica(s)
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:0-5460 (5461 slots) master
[*] 1 additional replica(s)
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]>>> Send CLUSTER MEET to node 127.0.0.1:7007 to make it join the cluster.
[*] New node added correctly.
[*]#
可以看到7007加入这个Cluster，并成为一个新的节点。
可以check以下7007节点状态
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[*]# ./redis-trib.rb check 127.0.0.1:7007
[*]>>> Performing Cluster Check (using node 127.0.0.1:7007)
[*]M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots: (0 slots) master
[*] 0 additional replica(s)
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:0-5460 (5461 slots) master
[*] 1 additional replica(s)
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:10923-16383 (5461 slots) master
[*] 1 additional replica(s)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:5461-10922 (5462 slots) master
[*] 1 additional replica(s)
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
slots: (0 slots) master
0 additional replica(s)
上面信息可以看到有4个M节点，3个S节点，7007成为了M主节点，它没有附属的从节点，而且Cluster并未给7007分配哈希卡槽（0 slots）。
可以从客户端连接集群查看一下，集群节点的连接情况
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[*]# cd redis07/
[*]# ./redis-cli -c -p 7007
[*]127.0.0.1:7007> cluster nodes
[*]8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006 slave f9886c71e98a53270f7fda961e1c5f730382d48f 0 1462955393326 3 connected
[*]dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001 master - 0 1462955388247 1 connected 0-5460
[*]ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007 myself,master - 0 0 0 connected
[*]f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003 master - 0 1462955390270 3 connected 10923-16383
[*]1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002 slave a5db243087d8bd423b9285fa8513eddee9bb59a6 0 1462955394334 7 connected
[*]a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005 master - 0 1462955392309 7 connected 5461-10922
[*]50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004 slave dd19221c404fb2fc4da37229de56bab755c76f2b 0 1462955389663 1 connected
[*]127.0.0.1:7007>
redis-cluster在新增节点时并未分配卡槽，需要我们手动对集群进行重新分片迁移数据，需要重新分片命令 reshard
redis-trib.rb reshard 127.0.0.1:7005
这个命令是用来迁移slot节点的，后面的127.0.0.1:7005是表示是哪个集群，端口填［7000-7007］都可以，执行结果如下：
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[*]# ./redis-trib.rb reshard 127.0.0.1:7005
[*]>>> Performing Cluster Check (using node 127.0.0.1:7005)
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:5461-10922 (5462 slots) master
[*] 1 additional replica(s)
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:10923-16383 (5461 slots) master
[*] 1 additional replica(s)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots: (0 slots) master
[*] 0 additional replica(s)
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:0-5460 (5461 slots) master
[*] 1 additional replica(s)
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]How many slots do you want to move (from 1 to 16384)?
它提示我们需要迁移多少slot到7007上，我们平分16384个哈希槽给4个节点：16384/4 = 4096，我们需要移动4096个槽点到7007上。
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[*] All 16384 slots covered.
[*]How many slots do you want to move (from 1 to 16384)? 4096
[*]What is the receiving node ID?
需要输入7007的节点id，ee3efb90e5ac0725f15238a64fc60a18a71205d7
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[*]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:
redis-trib 会向你询问重新分片的源节点（source node），即，要从特点的哪个节点中取出 4096 个哈希槽，还是从全部节点提取4096个哈希槽， 并将这些槽移动到7007节点上面。
如果我们不打算从特定的节点上取出指定数量的哈希槽，那么可以向redis-trib输入 all，这样的话， 集群中的所有主节点都会成为源节点，redis-trib从各个源节点中各取出一部分哈希槽，凑够4096个，然后移动到7007节点上：
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[*]Source node #1:all
然后开始从别的主节点迁移哈希槽，并且确认。
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[*] Moving slot 1343 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1344 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1345 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1346 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1347 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1348 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1349 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1350 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1351 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1352 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1353 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1354 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1355 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1356 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1357 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1358 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1359 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1360 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1361 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1362 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1363 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*] Moving slot 1364 from dd19221c404fb2fc4da37229de56bab755c76f2b
[*]Do you want to proceed with the proposed reshard plan (yes/no)? yes
确认之后，redis-trib就开始执行分片操作，将哈希槽一个一个从源主节点移动到7007目标主节点。
重新分片结束后我们可以check以下节点的分配情况。
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[*]# ./redis-trib.rb check 127.0.0.1:7001
[*]>>> Performing Cluster Check (using node 127.0.0.1:7001)
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:1365-5460 (4096 slots) master
[*] 1 additional replica(s)
[*]M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots:0-1364,5461-6826,10923-12287 (4096 slots) master
[*] 0 additional replica(s)
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:6827-10922 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:12288-16383 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
slots:0-1364,5461-6826,10923-12287 (4096 slots) master
可以看到7007节点分片的哈希槽片不是连续的，间隔的移动。
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[*]# cd redis07/
[*]# ./redis-cli -c 7007
[*]Could not connect to Redis at 127.0.0.1:6379: Connection refused
[*]# ./redis-cli -c -p 7007
[*]127.0.0.1:7007> keys *
[*]1) "name"
[*]2) "age"
[*]127.0.0.1:7007>
[*]127.0.0.1:7007>
可以看到将7001的age和name移动到7007节点上，
主节点7007添加成功。
2、新增从节点
新增一个节点7008节点，使用add-node --slave命令。
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[*]# cp -r redis01/ redis08
[*]# cd redis08/
[*]# sed -i "s/7001/7008/g" ./redis.conf
[*]# ./redis-server redis.conf
redis-trib增加从节点的命令为：
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[*]./redis-trib.rb add-node --slave --master-id $ 127.0.0.1:7008 127.0.0.1:7000
nodeid为要加到master主节点的node id，127.0.0.1:7008为新增的从节点，127.0.0.1:7000为集群的一个节点（集群的任意节点都行），用来辨识是哪个集群；如果没有给定那个主节点--master-id的话，redis-trib将会将新增的从节点随机到从节点较少的主节点上。
现在我们添加一下7008，看是否会自动加到没有从节点的7007主节点上。
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[*]# ./redis-trib.rb add-node --slave 127.0.0.1:7008 127.0.0.1:7001>>> Adding node 127.0.0.1:7008 to cluster 127.0.0.1:7001
[*]>>> Performing Cluster Check (using node 127.0.0.1:7001)
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:1365-5460 (4096 slots) master
[*] 1 additional replica(s)
[*]M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots:0-1364,5461-6826,10923-12287 (4096 slots) master
[*] 0 additional replica(s)
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:6827-10922 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:12288-16383 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]Automatically selected master 127.0.0.1:7007
[*]>>> Send CLUSTER MEET to node 127.0.0.1:7008 to make it join the cluster.
[*]Waiting for the cluster to join.
[*]>>> Configure node as replica of 127.0.0.1:7007.
[*] New node added correctly.
[*]#
可以看到自动选择了127.0.0.1:7007为master主节点，并且添加成功。
可以check一下7008：
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[*]# ./redis-trib.rb check 127.0.0.1:7008
[*]>>> Performing Cluster Check (using node 127.0.0.1:7008)
[*]S: 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 127.0.0.1:7008
[*] slots: (0 slots) slave
[*] replicates ee3efb90e5ac0725f15238a64fc60a18a71205d7
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:6827-10922 (4096 slots) master
[*] 1 additional replica(s)
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:1365-5460 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots:0-1364,5461-6826,10923-12287 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:12288-16383 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
可以看到7008作为了7007的从节点。
再测试一下指定主节点添加从节点，给7007增加7009从节点。
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[*]# cp -r redis01/ redis09
[*]# cd redis09
[*]# sed -i "s/7001/7009/g" ./redis.conf
[*]# ./redis-server redis.conf
添加7007主节点上
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[*]# ./redis-trib.rb add-node --slave --master-id ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7009 127.0.0.1:7001
[*]>>> Adding node 127.0.0.1:7009 to cluster 127.0.0.1:7001
[*]>>> Performing Cluster Check (using node 127.0.0.1:7001)
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:1365-5460 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 127.0.0.1:7008
[*] slots: (0 slots) slave
[*] replicates ee3efb90e5ac0725f15238a64fc60a18a71205d7
[*]M: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots:0-1364,5461-6826,10923-12287 (4096 slots) master
[*] 1 additional replica(s)
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:6827-10922 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:12288-16383 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]>>> Send CLUSTER MEET to node 127.0.0.1:7009 to make it join the cluster.
[*]Waiting for the cluster to join.
[*]>>> Configure node as replica of 127.0.0.1:7007.
[*] New node added correctly.
[*]#
显示从节点7009节点添加到7007主节点，可以看一下7007的从节点，如下：
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[*]# cd ./redis07
[*]# ./redis-cli -c -p 7007 cluster nodes | grep ee3efb90e5ac0725f15238a64fc60a18a71205d7
[*]1f51443ede952b98724fea2a12f61fe710ab6cb1 127.0.0.1:7009 slave ee3efb90e5ac0725f15238a64fc60a18a71205d7 0 1462962710266 8 connected
[*]ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007 myself,master - 0 0 8 connected 0-1364 5461-6826 10923-12287
[*]2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 127.0.0.1:7008 slave ee3efb90e5ac0725f15238a64fc60a18a71205d7 0 1462962711607 8 connected
[*]#
maser 7007有2个slave 7008,7009。
我们测试一下7007节点挂掉，看7008和7009那个成为主节点。
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[*]# ps -ef | grep redis
[*]root 7950 10 12:50 ? 00:02:05 ./redis-server 127.0.0.1:7001
[*]root 7956 10 12:50 ? 00:02:11 ./redis-server 127.0.0.1:7003
[*]root 7960 10 12:50 ? 00:01:47 ./redis-server 127.0.0.1:7004
[*]root 7964 10 12:50 ? 00:02:07 ./redis-server 127.0.0.1:7005
[*]root 7966 10 12:50 ? 00:01:46 ./redis-server 127.0.0.1:7006
[*]root 12070 10 15:14 ? 00:01:08 ./redis-server 127.0.0.1:7002
[*]root 13441 10 16:09 ? 00:01:25 ./redis-server 127.0.0.1:7007
[*]root 15939 10 17:41 ? 00:00:20 ./redis-server 127.0.0.1:7008
[*]root 16623 10 18:07 ? 00:00:10 ./redis-server 127.0.0.1:7009
[*]root 17295105810 18:37 pts/2 00:00:00 grep --color=auto redis
[*]# kill -9 13441
[*]# cd ./redis08
[*]# ./redis-cli -c -p 7008
[*]127.0.0.1:7008> get name
[*]-> Redirected to slot located at 127.0.0.1:7009
[*]"andy"
[*]127.0.0.1:7009> cluster nodes
[*]ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007 master,fail - 1462963082317 1462963080194 8 disconnected
[*]50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004 slave dd19221c404fb2fc4da37229de56bab755c76f2b 0 1462963170968 1 connected
[*]f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003 master - 0 1462963168525 3 connected 12288-16383
[*]dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001 master - 0 1462963164466 1 connected 1365-5460
[*]2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 127.0.0.1:7008 slave 1f51443ede952b98724fea2a12f61fe710ab6cb1 0 1462963167508 9 connected
[*]1f51443ede952b98724fea2a12f61fe710ab6cb1 127.0.0.1:7009 myself,master - 0 0 9 connected 0-1364 5461-6826 10923-12287
[*]1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002 slave a5db243087d8bd423b9285fa8513eddee9bb59a6 0 1462963170564 7 connected
[*]8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006 slave f9886c71e98a53270f7fda961e1c5f730382d48f 0 1462963167915 3 connected
[*]a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005 master - 0 1462963169538 7 connected 6827-10922
[*]127.0.0.1:7009>
可以看到7009代替7007成了主节点。
重启7007之后，会自动变成7009的从节点。
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[*]# cd redis07
[*]# ./redis-server redis.conf
[*]# cd ../
[*]# ./redis-trib.rb check 127.0.0.1:7007
[*]>>> Performing Cluster Check (using node 127.0.0.1:7007)
[*]S: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates dd19221c404fb2fc4da37229de56bab755c76f2b
[*]M: 1f51443ede952b98724fea2a12f61fe710ab6cb1 127.0.0.1:7009
[*] slots:0-1364,5461-6826,10923-12287 (4096 slots) master
[*] 2 additional replica(s)
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots:1365-5460 (4096 slots) master
[*] 1 additional replica(s)
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:6827-10922 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:12288-16383 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 127.0.0.1:7008
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
验证了之前的测试。
六、节点的移除
和节点添加一样，移除节点也有移除主节点，从节点。
1、移除主节点
移除节点使用redis-trib的del-node命令，
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[*]redis-trib del-node 127.0.0.1:7002${node-id}
127.0.0.1:7002位集群节点，node-id为要删除的主节点。 和添加节点不同，移除节点node-id是必需的，测试删除7001主节点：
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[*]# ./redis-trib.rb del-node 127.0.0.1:7001 <span style="font-size: 14px;">dd19221c404fb2fc4da37229de56bab755c76f2b</span>
[*]>>> Removing node <span style="font-size: 14px;">dd19221c404fb2fc4da37229de56bab755c76f2b</span> from cluster 127.0.0.1:7002
[*] Node 127.0.0.1:7001 is not empty! Reshard data away and try again.
[*]#
redis cluster提示7001已经有数据了，不能够被删除，需要将他的数据转移出去，也就是和新增主节点一样需重新分片。
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[*]# ./redis-trib.rb reshard 127.0.0.1:7002
执行以后会提示我们移除的大小，因为7001占用了4096个槽点
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[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]How many slots do you want to move (from 1 to 16384)?
输入4096
提示移动的node id，填写7009的node id。
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[*]How many slots do you want to move (from 1 to 16384)? 4096
[*]What is the receiving node ID?
需要移动到全部主节点上还是单个主节点
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[*]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:
将4096个槽点移动到7009上，填写7001的node id ：dd19221c404fb2fc4da37229de56bab755c76f2b
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[*]Source node #1:dd19221c404fb2fc4da37229de56bab755c76f2b
[*]Source node #2:done
[*]Do you want to proceed with the proposed reshard plan (yes/no)? yes
确认之后会一个一个将7001的卡槽移到到7009上。
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[*]# ./redis-trib.rb check 127.0.0.1:7009
[*]>>> Performing Cluster Check (using node 127.0.0.1:7009)
[*]M: 1f51443ede952b98724fea2a12f61fe710ab6cb1 127.0.0.1:7009
[*] slots:0-6826,10923-12287 (8192 slots) master
[*] 3 additional replica(s)
[*]S: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:12288-16383 (4096 slots) master
[*] 1 additional replica(s)
[*]M: dd19221c404fb2fc4da37229de56bab755c76f2b 127.0.0.1:7001
[*] slots: (0 slots) master
[*] 0 additional replica(s)
[*]S: 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 127.0.0.1:7008
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:6827-10922 (4096 slots) master
[*] 1 additional replica(s)
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
可以看到7001有0个卡槽，而7009有8192个卡槽。
在执行移除操作
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[*]# ./redis-trib.rb del-node 127.0.0.1:7002 dd19221c404fb2fc4da37229de56bab755c76f2b
[*]>>> Removing node dd19221c404fb2fc4da37229de56bab755c76f2b from cluster 127.0.0.1:7002
[*]>>> Sending CLUSTER FORGET messages to the cluster...
[*]>>> SHUTDOWN the node.
[*]#
已经删除了7001节点。
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[*]# ./redis-trib.rb check 127.0.0.1:7001
[*] Sorry, can't connect to node 127.0.0.1:7001
[*]# ./redis-trib.rb check 127.0.0.1:7009
[*]>>> Performing Cluster Check (using node 127.0.0.1:7009)
[*]M: 1f51443ede952b98724fea2a12f61fe710ab6cb1 127.0.0.1:7009
[*] slots:0-6826,10923-12287 (8192 slots) master
[*] 3 additional replica(s)
[*]S: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:12288-16383 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 127.0.0.1:7008
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:6827-10922 (4096 slots) master
[*] 1 additional replica(s)
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
可以看到7001已经连接不了；而7001的从节点7004自动分配到了7009主节点中，7009现在3个从节点。
2、移除从节点
比如删除7009的7008节点：
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[*]# ./redis-trib.rb del-node 127.0.0.1:7009 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5
[*]>>> Removing node 2ab1b061c36f30ae35604e9a171ae3afdc3c87e5 from cluster 127.0.0.1:7009
[*]>>> Sending CLUSTER FORGET messages to the cluster...
[*]>>> SHUTDOWN the node.
[*]# ./redis-trib.rb check 127.0.0.1:7008
[*] Sorry, can't connect to node 127.0.0.1:7008
[*]#
删除从节点比较方便，现在redis-cluster中有3个主节点，4个从节点，如下：
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[*]# ./redis-trib.rb check 127.0.0.1:7009
[*]>>> Performing Cluster Check (using node 127.0.0.1:7009)
[*]M: 1f51443ede952b98724fea2a12f61fe710ab6cb1 127.0.0.1:7009
[*] slots:0-6826,10923-12287 (8192 slots) master
[*] 2 additional replica(s)
[*]S: ee3efb90e5ac0725f15238a64fc60a18a71205d7 127.0.0.1:7007
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]S: 50ce1ea59106b4c2c6bc502593a6a7a7dabf5041 127.0.0.1:7004
[*] slots: (0 slots) slave
[*] replicates 1f51443ede952b98724fea2a12f61fe710ab6cb1
[*]M: f9886c71e98a53270f7fda961e1c5f730382d48f 127.0.0.1:7003
[*] slots:12288-16383 (4096 slots) master
[*] 1 additional replica(s)
[*]S: 1f07d76585bfab35f91ec711ac53ab4bc00f2d3a 127.0.0.1:7002
[*] slots: (0 slots) slave
[*] replicates a5db243087d8bd423b9285fa8513eddee9bb59a6
[*]S: 8bb3ede48319b46d0015440a91ab277da9353c8b 127.0.0.1:7006
[*] slots: (0 slots) slave
[*] replicates f9886c71e98a53270f7fda961e1c5f730382d48f
[*]M: a5db243087d8bd423b9285fa8513eddee9bb59a6 127.0.0.1:7005
[*] slots:6827-10922 (4096 slots) master
[*] 1 additional replica(s)
[*] All nodes agree about slots configuration.
[*]>>> Check for open slots...
[*]>>> Check slots coverage...
[*] All 16384 slots covered.
[*]#
ok，测试到这儿吧。
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