redis创建集，redis-trib.rb命令详解
redis-trib.rb是官⽅提供的Redis Cluster的管理⼯具，⽆需额外下载，默认位于源码包的src⽬录下，但因该⼯具是⽤ruby开发的，所以需要准备相关的依赖环境。 准备redis-trib.rb的运⾏环境
tar xvf ruby-2.5.
cd ruby-2.5.1/
./configure -prefix=/usr/local/ruby
make
make install
cd /usr/local/ruby/
cp bin/ruby /usr/local/bin
cp bin/gem /usr/local/bin
安装rubygem redis依赖
光纤电话机gem install -l redis-3.
redis-trib.rb⽀持的操作
# redis-trib.rb help
Usage: redis-trib <command> <options> <arguments ...>
create host1:port1 ... hostN:portN
--replicas <arg>
check host:port
info host:port
fix host:port
-
-timeout <arg>
reshard host:port
--from <arg>
--to <arg>
--slots <arg>
--yes
--timeout <arg>
--pipeline <arg>
rebalance host:port
--weight <arg>
--auto-weights
-
-use-empty-masters
--timeout <arg>
--simulate
--pipeline <arg>
--threshold <arg>
add-node new_host:new_port existing_host:existing_port
--slave
--master-id <arg>
del-node host:port node_id
set-timeout host:port milliseconds
call host:port command arg arg .. arg
import host:port
--from <arg>
--copy
--replace
help (show this help)
For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.
⽀持的操作如下：
1. create：创建集
2. check：检查集
3. info：查看集信息
4. fix：修复集
5. reshard：在线迁移slot
7. add-node：添加新节点
8. del-node：删除节点
9. set-timeout：设置节点的超时时间
10. call：在集所有节点上执⾏命令
创建集
redis-trib.rb create --replicas 1 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384
--replicas参数指定集中每个主节点配备⼏个从节点，这⾥设置为1。
>>> Creating cluster
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Performing hash slots allocation on
Using 3 masters:
127.0.0.1:6379
127.0.0.1:6380
127.0.0.1:6381
Adding replica 127.0.0.1:6383 to 127.0.0.1:6379
Adding replica 127.0.0.1:6384 to 127.0.0.1:6380
Adding replica 127.0.0.1:6382 to 127.0.0.1:6381
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: bc775f9c4dea40820b82c9451778b1fcd42f92bc 127.0.0.1:6379
slots:0-5460 (5461 slots) master
M: 3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380
slots:5461-10922 (5462 slots) master
M: d874f003257f1fb036bbd856ca605172a1741232 127.0.0.1:6381
slots:10923-16383 (5461 slots) master
S: 648eb314863b82aaa676380be7db2ec307f5547d 127.0.0.1:6382
replicates bc775f9c4dea40820b82c9451778b1fcd42f92bc
S: 65a6efb441ac44c348f7da8c62e26b888cda7c48 127.0.0.1:6383
replicates 3b27d00d13706a032a92ff6b0a914af272dcaaf2
S: 57bda956485109552547aef6c77fba43d2124abf 127.0.0.1:6384
replicates d874f003257f1fb036bbd856ca605172a1741232
Can I set the above configuration? (type 'yes' to accept): yes
来电显示电话机
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster
>>> Performing Cluster Check (using node 127.0.0.1:6379)
M: bc775f9c4dea40820b82c9451778b1fcd42f92bc 127.0.0.1:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 648eb314863b82aaa676380be7db2ec307f5547d 127.0.0.1:6382
slots: (0 slots) slave扫频信号源
replicates bc775f9c4dea40820b82c9451778b1fcd42f92bc
M: 3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 57bda956485109552547aef6c77fba43d2124abf 127.0.0.1:6384
slots: (0 slots) slave
replicates d874f003257f1fb036bbd856ca605172a1741232
S: 65a6efb441ac44c348f7da8c62e26b888cda7c48 127.0.0.1:6383
slots: (0 slots) slave
疲劳驾驶预警系统
replicates 3b27d00d13706a032a92ff6b0a914af272dcaaf2
M: d874f003257f1fb036bbd856ca605172a1741232 127.0.0.1:6381
slots:10923-16383 (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for
>>> Check
[OK] All 16384 slots covered.
16384个槽全部被分配，集创建成功。注意：给redis-trib.rb的节点地址必须是不包含任何槽/数据的节点，否则会拒绝创建集。 >>> Creating cluster
/
usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
[ERR] Node 127.0.0.1:6379 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
关于主从节点的选择及槽的分配，其算法如下：
1> 把节点按照host分类，这样保证master节点能分配到更多的主机中。
2> 遍历host列表，从每个host列表中弹出⼀个节点，放⼊interleaved数组。直到所有的节点都弹出为⽌。
3> 将interleaved数组中前master个数量的节点保存到masters数组中。
4> 计算每个master节点负责的slot数量，16384除以master数量取整，这⾥记为N。
5> 遍历masters数组，每个master分配N个slot，最后⼀个master，分配剩下的slot。
6> 接下来为master分配slave，分配算法会尽量保证master和slave节点不在同⼀台主机上。对于分配
完指定slave数量的节点，还有多余的节点，也会为这些节点寻master。分配算法会遍历两次masters数组。
7> 第⼀次遍历master数组，在余下的节点列表到replicas数量个slave。每个slave为第⼀个和master节点host不⼀样的节点，如果没有不⼀样的节点，则直接取出余下列表的第⼀个节点。
8> 第⼆次遍历是分配节点数除以replicas不为整数⽽多出的⼀部分节点。
检查集状态
redis-trib.rb check 127.0.0.1:6379
指定任意⼀个节点即可。
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated
>>> Performing Cluster Check (using node 127.0.0.1:6379)
M: bc775f9c4dea40820b82c9451778b1fcd42f92bc 127.0.0.1:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 648eb314863b82aaa676380be7db2ec307f5547d 127.0.0.1:6382
slots: (0 slots) slave
replicates bc775f9c4dea40820b82c9451778b1fcd42f92bc
M: 3b27d00d13706a032a92ff6b0a914af272dcaaf2 127.0.0.1:6380
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 57bda956485109552547aef6c77fba43d2124abf 127.0.0.1:6384
slots: (0 slots) slave
replicates d874f003257f1fb036bbd856ca605172a1741232
S: 65a6efb441ac44c348f7da8c62e26b888cda7c48 127.0.0.1:6383
slots: (0 slots) slave
replicates 3b27d00d13706a032a92ff6b0a914af272dcaaf2
M: d874f003257f1fb036bbd856ca605172a1741232 127.0.0.1:6381
slots:10923-16383 (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for
>>> Check
[OK] All 16384 slots covered.
查看集信息
redis-trib.rb info 127.0.0.1:6383
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated 127.0.0.1:6380 () -> 0 keys | 5462 slots | 1 slaves.
127.0.0.1:6381 () -> 1 keys | 5461 slots | 1 slaves.
127.0.0.1:6379 () -> 0 keys | 5461 slots | 1 slaves.
[OK] 1 keys in 3 masters.
0.00 keys per slot on average.
修复集
⽬前fix命令能修复两种异常，
1. 节点中存在处于迁移中（importing或migrating状态）的slot。
洗水2. 节点中存在未分配的slot。
检修电源箱
其它异常不能通过fix命令修复。
[root@slowtech conf]# redis-trib.rb fix 127.0.0.1:6379
/usr/local/ruby/lib/ruby/gems/2.5.0/gems/redis-3.3.0/lib/redis/client.rb:459: warning: constant ::Fixnum is deprecated >>> Performing Cluster Check (using node 127.0.0.1:6379)
S: d826c5fd98efa8a17a880e9a90a25f06c88e6ae9 127.0.0.1:6379
slots: (0 slots) slave
replicates a8b3d0f9b12d63dab3b7337d602245d96dd55844
S: 55c05d5b0dfea0d52f88548717ddf24975268de6 127.0.0.1:6383
slots: (0 slots) slave
replicates a8b3d0f9b12d63dab3b7337d602245d96dd55844
M: f413fb7e6460308b17cdb71442798e1341b56cbc 127.0.0.1:6381
slots:50-16383 (16334 slots) master
2 additional replica(s)
S: beba753c5a63607fa66d9ec7427ed9a511ea136e 127.0.0.1:6382
slots: (0 slots) slave
replicates f413fb7e6460308b17cdb71442798e1341b56cbc
S: 83797d518e56c235272402611477f576973e9d34 127.0.0.1:6384
slots: (0 slots) slave
replicates f413fb7e6460308b17cdb71442798e1341b56cbc
M: a8b3d0f9b12d63dab3b7337d602245d96dd55844 127.0.0.1:6380
slots:0-49 (50 slots) master
2 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for
>>> Check
[OK] All 16384 slots covered.
在线迁移slot
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