Redis相关笔记（5）集群
Redis 相关笔记（5）集群
redis自带分布式集群：
1.找到redis源码目录：
# cd xxx/redis-x-x/utils/create-cluster/
打开create-cluster脚本:
# vi create-cluster
#!/bin/bash
# Settings
BIN_PATH="../../src/"
CLUSTER_HOST=127.0.0.1
PORT=30000
TIMEOUT=2000
NODES=6
REPLICAS=1
PROTECTED_MODE=yes
ADDITIONAL_OPTIONS=""
# You may want to put the above config parameters into config.sh in order to
# override the defaults without modifying this script.
...
需要修改的只有前面setting部分的几个选项；
Nodes为启动的redis实例总数
REPLICAS为所有主从复制的集群拥有的备机数，一般REPLICAS数+1为NODES数的约数（NODES可以被REPLICAS+1整除）
需要修改的就这两项实验够用了：
启动脚本：
# ./create-cluster start
Starting 30001
Starting 30002
Starting 30003
Starting 30004
Starting 30005
Starting 30006
启动完毕，创建集群：
# ./create-cluster create
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 127.0.0.1:30005 to 127.0.0.1:30001
Adding replica 127.0.0.1:30006 to 127.0.0.1:30002
Adding replica 127.0.0.1:30004 to 127.0.0.1:30003
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 9f382b2cd7592e52d872911a6dd460c5712ab3ea 127.0.0.1:30001
slots:[0-5460] (5461 slots) master
M: 4e7d796d83a731e4833eeac23b912e9eb6dcf7e2 127.0.0.1:30002
slots:[5461-10922] (5462 slots) master
M: 2f44727fddbeab371405bc931a87e8ba0b09ef00 127.0.0.1:30003
slots:[10923-16383] (5461 slots) master
S: d35e982246e825ed03a1f2b39f051bb869ccdd29 127.0.0.1:30004
replicates 9f382b2cd7592e52d872911a6dd460c5712ab3ea
S: 97bb3516cdf24f12c47bea3d10a1fe49b702d580 127.0.0.1:30005
replicates 4e7d796d83a731e4833eeac23b912e9eb6dcf7e2
S: 4778e46d088f8bc1a0713a0a0130148b0c84f37e 127.0.0.1:30006
replicates 2f44727fddbeab371405bc931a87e8ba0b09ef00
Can I set the above configuration? (type 'yes' to accept):
输入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 127.0.0.1:30001)
M: 9f382b2cd7592e52d872911a6dd460c5712ab3ea 127.0.0.1:30001
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 4e7d796d83a731e4833eeac23b912e9eb6dcf7e2 127.0.0.1:30002
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: d35e982246e825ed03a1f2b39f051bb869ccdd29 127.0.0.1:30004
slots: (0 slots) slave
replicates 9f382b2cd7592e52d872911a6dd460c5712ab3ea
S: 4778e46d088f8bc1a0713a0a0130148b0c84f37e 127.0.0.1:30006
slots: (0 slots) slave
replicates 2f44727fddbeab371405bc931a87e8ba0b09ef00
S: 97bb3516cdf24f12c47bea3d10a1fe49b702d580 127.0.0.1:30005
slots: (0 slots) slave
replicates 4e7d796d83a731e4833eeac23b912e9eb6dcf7e2
M: 2f44727fddbeab371405bc931a87e8ba0b09ef00 127.0.0.1:30003
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.
创建完成，查看帮助：
# redis-cli --cluster help
Cluster Manager Commands:
create host1:port1 ... hostN:portN
--cluster-replicas <arg>
check host:port
--cluster-search-multiple-owners
info host:port
fix host:port
--cluster-search-multiple-owners
--cluster-fix-with-unreachable-masters
reshard host:port
--cluster-from <arg>
--cluster-to <arg>
--cluster-slots <arg>
--cluster-yes
--cluster-timeout <arg>
--cluster-pipeline <arg>
--cluster-replace
rebalance host:port
--cluster-weight <node1=w1...nodeN=wN>
--cluster-use-empty-masters
--cluster-timeout <arg>
--cluster-simulate
--cluster-pipeline <arg>
--cluster-threshold <arg>
--cluster-replace
add-node new_host:new_port existing_host:existing_port
--cluster-slave
--cluster-master-id <arg>
del-node host:port node_id
call host:port command arg arg .. arg
--cluster-only-masters
--cluster-only-replicas
set-timeout host:port milliseconds
import host:port
--cluster-from <arg>
--cluster-from-user <arg>
--cluster-from-pass <arg>
--cluster-from-askpass
--cluster-copy
--cluster-replace
backup host:port backup_directory
help
For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.
Cluster Manager Options:
--cluster-yes Automatic yes to cluster commands prompts
举例：reshard
# redis-cli --cluster reshard 127.0.0.1:30001
>>> Performing Cluster Check (using node 127.0.0.1:30001)
M: 9f382b2cd7592e52d872911a6dd460c5712ab3ea 127.0.0.1:30001
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 4e7d796d83a731e4833eeac23b912e9eb6dcf7e2 127.0.0.1:30002
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: d35e982246e825ed03a1f2b39f051bb869ccdd29 127.0.0.1:30004
slots: (0 slots) slave
replicates 9f382b2cd7592e52d872911a6dd460c5712ab3ea
S: 4778e46d088f8bc1a0713a0a0130148b0c84f37e 127.0.0.1:30006
slots: (0 slots) slave
replicates 2f44727fddbeab371405bc931a87e8ba0b09ef00
S: 97bb3516cdf24f12c47bea3d10a1fe49b702d580 127.0.0.1:30005
slots: (0 slots) slave
replicates 4e7d796d83a731e4833eeac23b912e9eb6dcf7e2
M: 2f44727fddbeab371405bc931a87e8ba0b09ef00 127.0.0.1:30003
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.
How many slots do you want to move (from 1 to 16384)?
写入你想移动的槽位，
What is the receiving node ID?
写入你想设置的接受槽位的结点：
Source node #1:
写入你想分配槽位的结点：
Source node #2:
可以再写（你给出的所有节点会平均分配槽位个数，总数等于之前设置的槽位个数）完成了就写done，表示总共就是以上写得这些结点给出槽位。
Moving slot 0 from 9f382b2cd7592e52d872911a6dd460c5712ab3ea
...
Moving slot 1999 from 9f382b2cd7592e52d872911a6dd460c5712ab3ea
Do you want to proceed with the proposed reshard plan (yes/no)?
输入yes：
Moving slot 0 from 127.0.0.1:30001 to 127.0.0.1:30002:
...
Moving slot 1999 from 127.0.0.1:30001 to 127.0.0.1:30002:
完成
停止集群：
# ./create-cluster stop
Stopping 30001
Stopping 30002
Stopping 30003
Stopping 30004
Stopping 30005
Stopping 30006
清理缓存：
# ./create-cluster clean
完成
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