Redis Cluster 集群
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Redis Cluster
Redis Cluster 工作原理
在哨兵sentinel机制中，可以解决redis高可用问题，即当master故障后可以自动将slave提升为
master，从而可以保证redis服务的正常使用，但是无法解决redis单机写入的瓶颈问题，即单机redis写
入性能受限于单机的内存大小、并发数量、网卡速率等因素。
早期Redis 分布式集群部署方案：
- 客户端分区：由客户端程序决定key写分配和写入的redis node，但是需要客户端自己处理写入分
配、高可用管理和故障转移等 - 代理方案：基于三方软件实现redis proxy，客户端先连接之代理层，由代理层实现key的写入分
配，对客户端来说是有比较简单，但是对于集群管节点增减相对比较麻烦，而且代理本身也是单点
和性能瓶颈。
redis 3.0版本之后推出了无中心架构的redis cluster机制，在无中心的redis集群当中，其每个节点保存
当前节点数据和整个集群状态,每个节点都和其他所有节点连接
Redis Cluster特点如下：
- 所有Redis节点使用(PING机制)互联
- 集群中某个节点的是否失效，是由整个集群中超过半数的节点监测都失效，才能算真正的失效
- 客户端不需要proxy即可直接连接redis，应用程序中需要配置有全部的redis服务器IP
- redis cluster把所有的redis node 平均映射到 0-16383个槽位(slot)上，读写需要到指定的redis
node上进行操作，因此有多少个redis node相当于redis 并发扩展了多少倍，每个redis node 承
担16384/N个槽位 - Redis cluster预先分配16384个(slot)槽位，当需要在redis集群中写入一个key -value的时候，会
使用CRC16(key) mod 16384之后的值，决定将key写入值哪一个槽位从而决定写入哪一个Redis节
点上，从而有效解决单机瓶颈。
Redis cluster 架构
Redis cluster 基本架构
假如三个主节点分别是：A, B, C 三个节点，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 区间可以是：
节点A覆盖 0－5460
节点B覆盖 5461－10922
节点C覆盖 10923－16383
Redis cluster 主从架构
Redis cluster的架构虽然解决了并发的问题，但是又引入了一个新的问题，每个Redis master的高可用
如何解决？
那就是对每个master 节点都实现主从复制,从而实现 redis 高可用性
Redis Cluster 部署架构说明
环境A：3台服务器，每台服务器启动6379和6380两个redis 服务实例，适用于测试环境
环境B：6台服务器，分别是三组master/slave，适用于生产环境
说明：Redis 5.X 和之前版本相比有很多变化，以下分别介绍两个版本5.X和4.X的配置
部署方式介绍
redis cluster 有多种部署方法
- 原生命令安装
理解Redis Cluster架构
生产环境不使用 - 官方工具安装
高效、准确
生产环境可以使用 - 自主研发
可以实现可视化的自动化部署
原生命令手动部署
原生命令手动部署过程
- 在所有节点安装redis,并配置开启cluster功能
- 各个节点执行meet,实现所有节点的相互通信
- 为各个master 节点指派槽位范围
- 指定各个节点的主从关系
实战案例: 利用原生命令手动部署redis cluster
在所有节点安装redis并启动cluster功能
#在所有6个节点上都执行下面相同操作
[root@centos8 ~]#dnf -y install redis
[root@centos8 ~]#sed -i.bak -e \'s/bind 127.0.0.1/bind 0.0.0.0/\' -e
\'/masterauth/a masterauth 123456\' -e \'/# requirepass/a requirepass 123456\' -e
\'/# cluster-enabled yes/a cluster-enabled yes\' -e \'/# cluster-config-file nodes-
6379.conf/a cluster-config-file nodes-6379.conf\' -e \'/cluster-require-fullcoverage
yes/c cluster-require-full-coverage no\' /etc/redis.conf
[root@centos8 ~]#systemctl enable --now redis执行meet 操作实现相互通信
#在任一节点上和其它所有节点进行meet通信
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
meet 10.0.0.18 6379
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
meet 10.0.0.28 6379
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
meet 10.0.0.38 6379
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
meet 10.0.0.48 6379
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
meet 10.0.0.58 6379
#可以看到所有节点之间可以相互连接通信
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
nodes
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602515365000 3 connected
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602515367093 1 connected
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 master - 0
1602515365057 0 connected
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 master - 0
1602515365000 4 connected
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 master - 0
1602515365000 5 connected
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602515366074 2 connected
#由于没有槽位无法创建key
[root@centos8 ~]#redis-cli -a 123456 --no-auth-warning set name wang
(error) CLUSTERDOWN Hash slot not served
#查看当前状态
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
info
cluster_state:fail
cluster_slots_assigned:0
cluster_slots_ok:0
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:0
cluster_current_epoch:5
cluster_my_epoch:3
cluster_stats_messages_ping_sent:584
cluster_stats_messages_pong_sent:145
cluster_stats_messages_meet_sent:8
cluster_stats_messages_sent:737
cluster_stats_messages_ping_received:145
cluster_stats_messages_pong_received:151
cluster_stats_messages_received:296为各个master 节点指派槽位范围
#创建添加槽位的脚本
[root@centos8 ~]#cat addslot.sh
#!/bin/bash
host=$1
port=$2
start=$3
end=$4
pass=123456
for slot in `seq ${start} ${end}`;do
echo slot:$slot
redis-cli -h ${host} -p $port -a ${pass} --no-auth-warning cluster addslots
${slot}
done
#为三个master分配槽位,共16364/3=5,461.333333333333,平均每个master分配5,461个槽位
[root@centos8 ~]#bash addslot.sh 10.0.0.8 6379 0 5461
[root@centos8 ~]#bash addslot.sh 10.0.0.18 6379 5462 10922
[root@centos8 ~]#bash addslot.sh 10.0.0.28 6379 10923 16383
#当第一个master分配完槽位后,可以看到下面信息
[root@centos8 ~]#redis-cli -a 123456 --no-auth-warning cluster info
cluster_state:ok
cluster_slots_assigned:5462
cluster_slots_ok:5462
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:1
cluster_current_epoch:5
cluster_my_epoch:3
cluster_stats_messages_ping_sent:1234
cluster_stats_messages_pong_sent:782
cluster_stats_messages_meet_sent:8
cluster_stats_messages_sent:2024
cluster_stats_messages_ping_received:782
cluster_stats_messages_pong_received:801
cluster_stats_messages_received:1583
#当第一个master分配完槽位后,可以看到下面信息
[root@centos8 ~]#redis-cli -a 123456 --no-auth-warning cluster nodes
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602516039000 3 connected 0-5461
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602516044606 1 connected
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 master - 0
1602516042000 0 connected
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 master - 0
1602516041575 4 connected
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 master - 0
1602516042585 5 connected
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602516043595 2 connected
#分配槽位后可以创建key
[root@centos8 ~]#redis-cli -a 123456 --no-auth-warning set name wang
(error) MOVED 5798 10.0.0.18:6379
[root@centos8 ~]#redis-cli -h 10.0.0.18 -a 123456 --no-auth-warning set name
mage
OK
[root@centos8 ~]#redis-cli -h 10.0.0.18 -a 123456 --no-auth-warning get name
"mage"
#当所有的三个master分配完槽位后,可以看到下面信息
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
nodes
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602516633000 3 connected 0-5461
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602516635862 1 connected 5462-10922
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 master - 0
1602516635000 0 connected
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 master - 0
1602516635000 4 connected
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 master - 0
1602516634852 5 connected
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602516636872 2 connected 10923-16383
#当所有的三个master分配完槽位后,可以看到下面信息
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3 #三个成员
cluster_current_epoch:5
cluster_my_epoch:3
cluster_stats_messages_ping_sent:1832
cluster_stats_messages_pong_sent:1375
cluster_stats_messages_meet_sent:8
cluster_stats_messages_sent:3215
cluster_stats_messages_ping_received:1375
cluster_stats_messages_pong_received:1399
cluster_stats_messages_received:2774
指定各个节点的主从关系
#通过上面cluster nodes 查看master的ID信息,执行下面操作,将对应的slave 指定相应的master节
点,实现三对主从节点
[root@centos8 ~]#redis-cli -h 10.0.0.38 -a 123456 --no-auth-warning cluster
replicate a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab
OK
[root@centos8 ~]#redis-cli -h 10.0.0.48 -a 123456 --no-auth-warning cluster
replicate 97c5dcc3f33c2fc75c7fdded25d05d2930a312c0
OK
[root@centos8 ~]#redis-cli -h 10.0.0.58 -a 123456 --no-auth-warning cluster
replicate 4f146b1ac51549469036a272c60ea97f065ef832
OK
#在第一组主从节点创建成功后,可以看到下面信息
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
nodes
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602517124000 3 connected 0-5461
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602517123000 1 connected 5462-10922
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 slave
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 0 1602517125709 3 connected
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 master - 0
1602517124689 4 connected
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 master - 0
1602517123676 5 connected
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602517123000 2 connected 10923-16383
#在第一组主从节点创建成功后,可以看到下面信息
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning info
replication
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.38,port=6379,state=online,offset=322,lag=1
master_replid:7af8303230e2939cc22943e991f06c6409356c6e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:322
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:322
[root@centos8 ~]#redis-cli -h 10.0.0.38 -a 123456 --no-auth-warning info
replication
# Replication
role:slave
master_host:10.0.0.8
master_port:6379
master_link_status:up
master_last_io_seconds_ago:10
master_sync_in_progress:0
slave_repl_offset:336
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:7af8303230e2939cc22943e991f06c6409356c6e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:336
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:336
#所有三组主从节点创建成功后,可以看到最终结果
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
nodes
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602517611000 3 connected 0-5461
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602517614000 1 connected 5462-10922
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 slave
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 0 1602517615000 3 connected
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 slave
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 0 1602517616011 4 connected
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 slave
4f146b1ac51549469036a272c60ea97f065ef832 0 1602517613966 5 connected
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602517617034 2 connected 10923-16383
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:5
cluster_my_epoch:3
cluster_stats_messages_ping_sent:2813
cluster_stats_messages_pong_sent:2346
cluster_stats_messages_meet_sent:8
cluster_stats_messages_sent:5167
cluster_stats_messages_ping_received:2346
cluster_stats_messages_pong_received:2380
cluster_stats_messages_received:4726
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning info
replication
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.38,port=6379,state=online,offset=1022,lag=1
master_replid:7af8303230e2939cc22943e991f06c6409356c6e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1022
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1022
[root@centos8 ~]#redis-cli -h 10.0.0.18 -a 123456 --no-auth-warning info
replication
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.48,port=6379,state=online,offset=182,lag=1
master_replid:e4a8394213bd865a800c9326224584f8cb52f169
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:182
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:182
[root@centos8 ~]#redis-cli -h 10.0.0.28 -a 123456 --no-auth-warning info
replication
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.58,port=6379,state=online,offset=252,lag=0
master_replid:6d5e8f898e9023cfa0b7fe006ce42142175895e7
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:252
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:252
#查看主从节关系及槽位信息
[root@centos8 ~]#redis-cli -h 10.0.0.28 -a 123456 --no-auth-warning cluster
slots
1) 1) (integer) 10923
2) (integer) 16383
3) 1) "10.0.0.28"
2) (integer) 6379
3) "4f146b1ac51549469036a272c60ea97f065ef832"
4) 1) "10.0.0.58"
2) (integer) 6379
3) "07231a50043d010426c83f3b0788e6b92e62050f"
2) 1) (integer) 0
2) (integer) 5461
3) 1) "10.0.0.8"
2) (integer) 6379
3) "a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab"
4) 1) "10.0.0.38"
2) (integer) 6379
3) "cb20d58870fe05de8462787cf9947239f4bc5629"
3) 1) (integer) 5462
2) (integer) 10922
3) 1) "10.0.0.18"
2) (integer) 6379
3) "97c5dcc3f33c2fc75c7fdded25d05d2930a312c0"
4) 1) "10.0.0.48"
2) (integer) 6379
3) "779a24884dbe1ceb848a685c669ec5326e6c8944"验证 redis cluster 访问
#-c 表示以集群方式连接
[root@centos8 ~]#redis-cli -c -h 10.0.0.8 -a 123456 --no-auth-warning set
name wang
OK
[root@centos8 ~]#redis-cli -c -h 10.0.0.8 -a 123456 --no-auth-warning get
name
"wang"
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning get name
(error) MOVED 5798 10.0.0.18:6379
[root@centos8 ~]#redis-cli -h 10.0.0.18 -a 123456 --no-auth-warning get name
"wang"
[root@centos8 ~]#redis-cli -h 10.0.0.28 -a 123456 --no-auth-warning get name
(error) MOVED 5798 10.0.0.18:6379实战案例：基于Redis 5 的 redis cluster 部署
官方文档：https://redis.io/topics/cluster-tutorial
redis cluster 相关命令
范例: 查看 --cluster 选项帮助
[root@centos8 ~]#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
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
set-timeout host:port milliseconds
import host:port
--cluster-from <arg>
--cluster-copy
--cluster-replace
help
For check, fix, reshard, del-node, set-timeout you can specify the host and port
of any working node in the cluster.
范例: 查看CLUSTER 指令的帮助
[root@centos8 ~]#redis-cli CLUSTER HELP
1) CLUSTER <subcommand> arg arg ... arg. Subcommands are:
2) ADDSLOTS <slot> [slot ...] -- Assign slots to current node.
3) BUMPEPOCH -- Advance the cluster config epoch.
4) COUNT-failure-reports <node-id> -- Return number of failure reports for
<node-id>.
5) COUNTKEYSINSLOT <slot> - Return the number of keys in <slot>.
6) DELSLOTS <slot> [slot ...] -- Delete slots information from current node.
7) FAILOVER [force|takeover] -- Promote current replica node to being a master.
8) FORGET <node-id> -- Remove a node from the cluster.
9) GETKEYSINSLOT <slot> <count> -- Return key names stored by current node in a
slot.
10) FLUSHSLOTS -- Delete current node own slots information.
11) INFO - Return onformation about the cluster.
12) KEYSLOT <key> -- Return the hash slot for <key>.
13) MEET <ip> <port> [bus-port] -- Connect nodes into a working cluster.
14) MYID -- Return the node id.
15) NODES -- Return cluster configuration seen by node. Output format:
16) <id> <ip:port> <flags> <master> <pings> <pongs> <epoch> <link> <slot>
... <slot>
17) REPLICATE <node-id> -- Configure current node as replica to <node-id>.
18) RESET [hard|soft] -- Reset current node (default: soft).
19) SET-config-epoch <epoch> - Set config epoch of current node.
20) SETSLOT <slot> (importing|migrating|stable|node <node-id>) -- Set slot
state.
21) REPLICAS <node-id> -- Return <node-id> replicas.
22) SLOTS -- Return information about slots range mappings. Each range is made
of:
23) start, end, master and replicas IP addresses, ports and ids
创建 redis cluster集群的环境准备
- 每个redis 节点采用相同的硬件配置、相同的密码、相同的redis版本
- 所有redis服务器必须没有任何数据
- 准备六台主机
启用 redis cluster 配置
所有6台主机都执行以下配置
[root@centos8 ~]#dnf -y install redis- 每个节点修改redis配置，必须开启cluster功能的参数
#手动修改配置文件
[root@redis-node1 ~]vim /etc/redis.conf
bind 0.0.0.0
masterauth 123456 #建议配置，否则后期的master和slave主从复制无法成功，还需再配置
requirepass 123456
cluster-enabled yes #取消此行注释,必须开启集群，开启后redis 进程会有cluster显示
cluster-config-file nodes-6379.conf #取消此行注释,此为集群状态文件,记录主从关系及
slot范围信息,由redis cluster 集群自动创建和维护
cluster-require-full-coverage no #默认值为yes,设为no可以防止一个节点不可用导致整
个cluster不可能
#或者执行下面命令,批量修改
[root@redis-node1 ~]#sed -i.bak -e \'s/bind 127.0.0.1/bind 0.0.0.0/\' -e
\'/masterauth/a masterauth 123456\' -e \'/# requirepass/a requirepass 123456\' -
e \'/# cluster-enabled yes/a cluster-enabled yes\' -e \'/# cluster-config-file
nodes-6379.conf/a cluster-config-file nodes-6379.conf\' -e \'/cluster-requirefull-
coverage yes/c cluster-require-full-coverage no\' /etc/redis.conf
[root@redis-node1 ~]#systemctl enable --now redis- 验证当前Redis服务状态：
#开启了16379的cluster的端口,实际的端口=redis port + 10000
[root@centos8 ~]#ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 0.0.0.0:22 0.0.0.0:*
LISTEN 0 100 127.0.0.1:25 0.0.0.0:*
LISTEN 0 128 0.0.0.0:16379 0.0.0.0:*
LISTEN 0 128 0.0.0.0:6379 0.0.0.0:*
LISTEN 0 128 [::]:22 [::]:*
LISTEN 0 100 [::1]:25 [::]:*
#注意进程有[cluster]状态
[root@centos8 ~]#ps -ef|grep redis
redis 1939 1 0 10:54 ? 00:00:00 /usr/bin/redis-server 0.0.0.0:6379
[cluster]
root 1955 1335 0 10:57 pts/0 00:00:00 grep --color=auto redis创建集群
# redis-cli --cluster-replicas 1 表示每个master对应一个slave节点
[root@redis-node1 ~]#redis-cli -a 123456 --cluster create 10.0.0.8:6379
10.0.0.18:6379 10.0.0.28:6379 10.0.0.38:6379 10.0.0.48:6379
10.0.0.58:6379 --cluster-replicas 1
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 10.0.0.38:6379 to 10.0.0.8:6379
Adding replica 10.0.0.48:6379 to 10.0.0.18:6379
Adding replica 10.0.0.58:6379 to 10.0.0.28:6379
M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379 #带M的为master
slots:[0-5460] (5461 slots) master #当前master的槽位起始
和结束位
M: 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379
slots:[5461-10922] (5462 slots) master
M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379
slots:[10923-16383] (5461 slots) master
S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379 #带S的slave
replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7
S: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379
replicates 99720241248ff0e4c6fa65c2385e92468b3b5993
S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379
replicates d34da8666a6f587283a1c2fca5d13691407f9462
Can I set the above configuration? (type \'yes\' to accept): yes #输入yes自动创建集群
>>> 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 10.0.0.8:6379)
M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379
slots:[0-5460] (5461 slots) master #已经分配的槽位
1 additional replica(s) #分配了一个slave
S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379
slots: (0 slots) slave #slave没有分配槽位
replicates d34da8666a6f587283a1c2fca5d13691407f9462 #对应的master的10.0.0.28的
ID
S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379
slots: (0 slots) slave
replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7 #对应的master的10.0.0.8的ID
S: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379
slots: (0 slots) slave
replicates 99720241248ff0e4c6fa65c2385e92468b3b5993 #对应的master的10.0.0.18的
ID
M: 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration. #所有节点槽位分配完成
>>> Check for open slots... #检查打开的槽位
>>> Check slots coverage... #检查插槽覆盖范围
[OK] All 16384 slots covered. #所有槽位(16384个)分配完成
#观察以上结果，可以看到3组master/slave
master:10.0.0.8---slave:10.0.0.38
master:10.0.0.18---slave:10.0.0.48
master:10.0.0.28---slave:10.0.0.58查看主从状态
[root@redis-node1 ~]#redis-cli -a 123456 -c INFO replication
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.38,port=6379,state=online,offset=896,lag=1
master_replid:3a388865080d779180ff240cb75766e7e57877da
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:896
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:896
[root@redis-node2 ~]#redis-cli -a 123456 INFO replication
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.48,port=6379,state=online,offset=980,lag=1
master_replid:b9066d3cbf0c5fecc7f4d1d5cb2433999783fa3f
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:980
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:980
[root@redis-node3 ~]#redis-cli -a 123456 INFO replication
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.58,port=6379,state=online,offset=980,lag=0
master_replid:53208e0ed9305d721e2fb4b3180f75c689217902
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:980
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:980
[root@redis-node4 ~]#redis-cli -a 123456 INFO replication
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
# Replication
role:slave
master_host:10.0.0.8
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:1036
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:3a388865080d779180ff240cb75766e7e57877da
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1036
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1036
[root@redis-node5 ~]#redis-cli -a 123456 INFO replication
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
# Replication
role:slave
master_host:10.0.0.18
master_port:6379
master_link_status:up
master_last_io_seconds_ago:2
master_sync_in_progress:0
slave_repl_offset:1064
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:b9066d3cbf0c5fecc7f4d1d5cb2433999783fa3f
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1064
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1064
[root@redis-node6 ~]#redis-cli -a 123456 INFO replication
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
# Replication
role:slave
master_host:10.0.0.28
master_port:6379
master_link_status:up
master_last_io_seconds_ago:7
master_sync_in_progress:0
slave_repl_offset:1078
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:53208e0ed9305d721e2fb4b3180f75c689217902
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1078
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1078范例: 查看指定master节点的slave节点信息
[root@centos8 ~]#redis-cli cluster nodes
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602571565772 12 connected 10923-16383
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 slave
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 0 1602571565000 11 connected
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602571564000 11 connected 5462-10922
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 slave
4f146b1ac51549469036a272c60ea97f065ef832 0 1602571565000 12 connected
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602571566000 10 connected 0-5461
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 slave
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 0 1602571566780 10 connected
#以下命令查看指定master节点的slave节点信息,其中
#a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 为master节点的ID
[root@centos8 ~]#redis-cli cluster slaves
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab
1) "cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 slave
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 0 1602571574844 10 connected"
验证集群状态
[root@redis-node1 ~]#redis-cli -a 123456 CLUSTER INFO
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6 #节点数
cluster_size:3 #三个集群
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:837
cluster_stats_messages_pong_sent:811
cluster_stats_messages_sent:1648
cluster_stats_messages_ping_received:806
cluster_stats_messages_pong_received:837
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:1648
#查看任意节点的集群状态
[root@redis-node1 ~]#redis-cli -a 123456 --cluster info 10.0.0.38:6379
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
10.0.0.18:6379 (99720241...) -> 0 keys | 5462 slots | 1 slaves.
10.0.0.28:6379 (d34da866...) -> 0 keys | 5461 slots | 1 slaves.
10.0.0.8:6379 (cb028b83...) -> 0 keys | 5461 slots | 1 slaves.
[OK] 0 keys in 3 masters.
0.00 keys per slot on average.
查看集群node对应关系
[root@redis-node1 ~]#redis-cli -a 123456 CLUSTER NODES
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379@16379 slave
d34da8666a6f587283a1c2fca5d13691407f9462 0 1582344815790 6 connected
f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379@16379 slave
cb028b83f9dc463d732f6e76ca6bbcd469d948a7 0 1582344811000 4 connected
d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379@16379 slave
99720241248ff0e4c6fa65c2385e92468b3b5993 0 1582344815000 5 connected
99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379@16379 master - 0
1582344813000 2 connected 5461-10922
d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379@16379 master - 0
1582344814780 3 connected 10923-16383
cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379@16379 myself,master - 0
1582344813000 1 connected 0-5460
[root@redis-node1 ~]#redis-cli -a 123456 --cluster check 10.0.0.38:6379
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
10.0.0.18:6379 (99720241...) -> 0 keys | 5462 slots | 1 slaves.
10.0.0.28:6379 (d34da866...) -> 0 keys | 5461 slots | 1 slaves.
10.0.0.8:6379 (cb028b83...) -> 0 keys | 5461 slots | 1 slaves.
[OK] 0 keys in 3 masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 10.0.0.38:6379)
S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379
slots: (0 slots) slave
replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7
S: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379
slots: (0 slots) slave
replicates 99720241248ff0e4c6fa65c2385e92468b3b5993
M: 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379
slots: (0 slots) slave
replicates d34da8666a6f587283a1c2fca5d13691407f9462
M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379
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.验证集群写入key
redis cluster 写入key
#经过算法计算，当前key的槽位需要写入指定的node
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.8 SET key1 values1
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
(error) MOVED 9189 10.0.0.18:6379 #槽位不在当前node所以无法写入
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 SET key1 values1
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
OK
#指定node可写入
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key1
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
"values1"
#对应的slave节点可以KEYS *,但GET key1失败,可以到master上执行GET key1
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.48 KEYS "*"
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
1) "key1"
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.48 GET key1
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
(error) MOVED 9189 10.0.0.18:6379redis cluster 计算key所属的slot
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
nodes
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602561649000 12 connected 10923-16383
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 slave
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 0 1602561648000 11 connected
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602561650000 11 connected 5462-10922
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 slave
4f146b1ac51549469036a272c60ea97f065ef832 0 1602561650229 12 connected
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602561650000 10 connected 0-5461
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 slave
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 0 1602561651238 10 connected
#计算得到hello对应的slot
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
keyslot hello
(integer) 866
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning set hello
magedu
OK
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster
keyslot name
(integer) 5798
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning set name
wang
(error) MOVED 5798 10.0.0.18:6379
[root@centos8 ~]#redis-cli -h 10.0.0.18 -a 123456 --no-auth-warning set name
wang
OK
[root@centos8 ~]#redis-cli -h 10.0.0.18 -a 123456 --no-auth-warning get name
"wang"
#使用选项-c 以集群模式连接
[root@centos8 ~]#redis-cli -c -h 10.0.0.8 -a 123456 --no-auth-warning
10.0.0.8:6379> cluster keyslot linux
(integer) 12299
10.0.0.8:6379> set linux love
-> Redirected to slot [12299] located at 10.0.0.28:6379
OK
10.0.0.28:6379> get linux
"love"
10.0.0.28:6379> exit
[root@centos8 ~]#redis-cli -h 10.0.0.28 -a 123456 --no-auth-warning get linux
"love"python脚本实现RedisCluster集群写入
[root@redis-node1 ~]#dnf -y install python3
[root@redis-node1 ~]#pip3 install redis-py-cluster
[root@redis-node1 ~]#vim redis_cluster_test.py
[root@redis-node1 ~]#cat ./redis_cluster_test.py
#!/usr/bin/env python3
from rediscluster import RedisCluster
startup_nodes = [
{"host":"10.0.0.8", "port":6379},
{"host":"10.0.0.18", "port":6379},
{"host":"10.0.0.28", "port":6379},
{"host":"10.0.0.38", "port":6379},
{"host":"10.0.0.48", "port":6379},
{"host":"10.0.0.58", "port":6379}
]
redis_conn= RedisCluster(startup_nodes=startup_nodes,password=\'123456\',
decode_responses=True)
for i in range(0, 10000):
redis_conn.set(\'key\'+str(i),\'value\'+str(i))
print(\'key\'+str(i)+\':\',redis_conn.get(\'key\'+str(i)))
[root@redis-node1 ~]#chmod +x redis_cluster_test.py
[root@redis-node1 ~]#./redis_cluster_test.py
......
key9998: value9998
key9999: value9999
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.8
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
10.0.0.8:6379> DBSIZE
(integer) 3331
10.0.0.8:6379> GET key1
(error) MOVED 9189 10.0.0.18:6379
10.0.0.8:6379> GET key2
"value2"
10.0.0.8:6379> GET key3
"value3"
10.0.0.8:6379> KEYS *
......
3329) "key7832"
3330) "key2325"
3331) "key2880"
10.0.0.8:6379>
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 DBSIZE
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
(integer) 3340
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key1
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
"value1"
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.28 DBSIZE
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
(integer) 3329
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key5
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
"value5"
[root@redis-node1 ~]#模拟master故障，对应的slave节点自动提升为新master
#模拟node2节点出故障,需要相应的数秒故障转移时间
[root@redis-node2 ~]#tail -f /var/log/redis/redis.log
[root@redis-node2 ~]#redis-cli -a 123456
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
127.0.0.1:6379> shutdown
not connected> exit
[root@redis-node2 ~]#ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 0.0.0.0:22 0.0.0.0:*
LISTEN 0 100 127.0.0.1:25 0.0.0.0:*
LISTEN 0 128 [::]:22 [::]:*
LISTEN 0 100 [::1]:25 [::]:*
[root@redis-node2 ~]# redis-cli -a 123456 --cluster info 10.0.0.8:6379
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
Could not connect to Redis at 10.0.0.18:6379: Connection refused
10.0.0.8:6379 (cb028b83...) -> 3331 keys | 5461 slots | 1 slaves.
10.0.0.48:6379 (d04e524d...) -> 3340 keys | 5462 slots | 0 slaves. #10.0.0.48为新
的master
10.0.0.28:6379 (d34da866...) -> 3329 keys | 5461 slots | 1 slaves.
[OK] 10000 keys in 3 masters.
0.61 keys per slot on average.
[root@redis-node2 ~]# redis-cli -a 123456 --cluster check 10.0.0.8:6379
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
Could not connect to Redis at 10.0.0.18:6379: Connection refused
10.0.0.8:6379 (cb028b83...) -> 3331 keys | 5461 slots | 1 slaves.
10.0.0.48:6379 (d04e524d...) -> 3340 keys | 5462 slots | 0 slaves.
10.0.0.28:6379 (d34da866...) -> 3329 keys | 5461 slots | 1 slaves.
[OK] 10000 keys in 3 masters.
0.61 keys per slot on average.
>>> Performing Cluster Check (using node 10.0.0.8:6379)
M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379
slots: (0 slots) slave
replicates d34da8666a6f587283a1c2fca5d13691407f9462
S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379
slots: (0 slots) slave
replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7
M: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379
slots:[5461-10922] (5462 slots) master
M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379
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@redis-node2 ~]#redis-cli -a 123456 -h 10.0.0.48
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
10.0.0.48:6379> INFO replication
# Replication
role:master
connected_slaves:0
master_replid:0000698bc2c6452d8bfba68246350662ae41d8fd
master_replid2:b9066d3cbf0c5fecc7f4d1d5cb2433999783fa3f
master_repl_offset:2912424
second_repl_offset:2912425
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1863849
repl_backlog_histlen:1048576
10.0.0.48:6379>
#恢复故障节点node2
[root@redis-node2 ~]#systemctl start redis
#查看自动生成的配置文件，可以查看node2自动成为slave节点
[root@redis-node2 ~]#cat /var/lib/redis/nodes-6379.conf
99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379@16379 myself,slave
d04e524daec4d8e22bdada7f21a9487c2d3e1057 0 1582352081847 2 connected
f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379@16379 slave
cb028b83f9dc463d732f6e76ca6bbcd469d948a7 1582352081868 1582352081847 4 connected
cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379@16379 master -
1582352081868 1582352081847 1 connected 0-5460
9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379@16379 slave
d34da8666a6f587283a1c2fca5d13691407f9462 1582352081869 1582352081847 3 connected
d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379@16379 master -
1582352081869 1582352081847 7 connected 5461-10922
d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379@16379 master -
1582352081869 1582352081847 3
vars currentEpoch 7 lastVoteEpoch 0
[root@redis-node2 ~]#redis-cli -a 123456 -h 10.0.0.48
Warning: Using a password with \'-a\' or \'-u\' option on the command line interface
may not be safe.
10.0.0.48:6379> INFO replication
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.18,port=6379,state=online,offset=2912564,lag=1
master_replid:0000698bc2c6452d8bfba68246350662ae41d8fd
master_replid2:b9066d3cbf0c5fecc7f4d1d5cb2433999783fa3f
master_repl_offset:2912564
second_repl_offset:2912425
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1863989
repl_backlog_histlen:1048576
10.0.0.48:6379>
实战案例：基于Redis 4 的 redis cluster 部署
准备redis Cluster 基本配置
- 每个redis 节点采用相同的硬件配置、相同的密码、相同的redis版本
- 所有redis服务器必须没有任何数据
- 准备三台CentOS 7 主机，已编译安装好redis，各启动两个redis实例，分别使用6379和6380端
口，从而模拟实现6台redis实例
范例: 6个物理节点环境的基于脚本安装后批量修改配置
[root@centos7 ~]#sed -i -e \'/^# masterauth/a masterauth 123456\' -e \'/# clusterenabled
yes/a cluster-enabled yes\' -e \'/# cluster-config-file nodes-6379.conf/a
cluster-config-file nodes-6379.conf\' -e \'/cluster-require-full-coverage yes/c
cluster-require-full-coverage no\' /apps/redis/etc/redis.conf
[root@centos7 ~]#grep \'^[^#]\' /apps/redis/etc/redis.conf
bind 0.0.0.0
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /apps/redis/run/redis_6379.pid
loglevel notice
logfile /apps/redis/log/redis-6379.log
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /apps/redis/data/
masterauth 123456
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
requirepass 123456
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
slave-lazy-flush no
appendonly no
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
aof-use-rdb-preamble no
lua-time-limit 5000
cluster-enabled yes
cluster-config-file nodes-6379.conf
cluster-require-full-coverage no
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes准备6个实例：在三个主机上重复下面的操作
#在三台主机上都编译安装redis
[root@redis-node1 ~]#yum -y install gcc jemalloc-devel
[root@redis-node1 ~]#cd /usr/local/src
[root@redis-node1 src]#wget http://download.redis.io/releases/redis-
4.0.14.tar.gz
[root@redis-node1 src]#tar xf redis-4.0.14.tar.gz
[root@redis-node1 src]#cd redis-4.0.14
[root@redis-node1 redis-4.0.14]#make PREFIX=/apps/redis install
#准备相关文件和目录
[root@redis-node1 redis-4.0.14]#ln -s /apps/redis/bin/redis-* /usr/bin/
[root@redis-node1 redis-4.0.14]#mkdir -p /apps/redis/{etc,log,data,run}
[root@redis-node1 redis-4.0.14]#cp redis.conf /apps/redis/etc/
#准备用户
[root@redis-node1 ~]#useradd -r -s /sbin/nologin redis
#配置权限和相关优化配置
[root@redis-node1 ~]#chown -R redis.redis /apps/redis
[root@redis-node1 ~]#cat >> /etc/sysctl.conf <<EOF
net.core.somaxconn = 1024
vm.overcommit_memory = 1
EOF
[root@redis-node1 ~]#sysctl -p
[root@redis-node1 ~]#echo \'echo never >
/sys/kernel/mm/transparent_hugepage/enabled\' >> /etc/rc.d/rc.local
[root@redis-node1 ~]#chmod +x /etc/rc.d/rc.local
[root@redis-node1 ~]#/etc/rc.d/rc.local
#准备service文件
[root@redis-node1 ~]#cat > /usr/lib/systemd/system/redis.service <<EOF
[Unit]
Description=Redis persistent key-value database
After=network.target
[Service]
ExecStart=/apps/redis/bin/redis-server /apps/redis/etc/redis.conf --supervised
systemd
ExecStop=/bin/kill -s QUIT \\$MAINPID
Type=notify
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755
[Install]
WantedBy=multi-user.target
EOF
[root@redis-node1 ~]#systemctl daemon-reload
[root@redis-node1 ~]#systemctl enable --now redis
#准备6379的实例配置文件
[root@redis-node1 ~]#systemctl stop redis
[root@redis-node1 ~]#cd /apps/redis/etc/
[root@redis-node1 etc]#sed -i -e \'s/bind 127.0.0.1/bind 0.0.0.0/\' -e \'/^#
masterauth/a masterauth 123456\' -e \'/# requirepass/a requirepass 123456\' -e \'/#
cluster-enabled yes/a cluster-enabled yes\' -e \'/# cluster-config-file nodes-
6379.conf/a cluster-config-file nodes-6379.conf\' -e \'s/^dir .*/dir
\\/apps\\/redis\\/data/\' -e \'/appendonly no/c appendonly yes\' -e \'/logfile ""/c
logfile "/apps/redis/log/redis-6379.log"\' -e \'/^pidfile .*/c pidfile
/apps/redis/run/redis_6379.pid\' /apps/redis/etc/redis.conf
#准备6380端口的实例的配置文件
[root@redis-node1 etc]#cp -p redis.conf redis6380.conf
[root@redis-node1 etc]#sed -i -e \'s/6379/6380/\' -e \'s/dbfilename
dump\\.rdb/dbfilename dump6380.rdb/\' -e \'s/appendfilename
"appendonly\\.aof"/appendfilename "appendonly6380.aof"/\'
/apps/redis/etc/redis6380.conf
#准备服务文件
[root@redis-node1 ~]#cp /lib/systemd/system/redis.service
/lib/systemd/system/redis6380.service
[root@redis-node1 ~]#sed -i \'s/redis.conf/redis6380.conf/\'
/lib/systemd/system/redis6380.service
#启动服务，查看到端口都打开
[root@redis-node1 ~]#systemctl daemon-reload
[root@redis-node1 ~]#systemctl enable --now redis redis6380
[root@redis-node1 ~]#ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 128 *:16379 *:*
LISTEN 0 128 *:16380 *:*
LISTEN 0 128 *:6379 *:*
LISTEN 0 128 *:6380 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 [::1]:25 [::]:*
LISTEN 0 128 [::]:22 [::]:*
[root@redis-node1 ~]#ps -ef|grep redis
redis 71539 1 0 22:13 ? 00:00:00 /apps/redis/bin/redis-server 0.0.0.0:6379
[cluster]
redis 71543 1 0 22:13 ? 00:00:00 /apps/redis/bin/redis-server 0.0.0.0:6380
[cluster]
root 71553 31781 0 22:15 pts/0 00:00:00 grep --color=auto redis
[root@redis-node1 ~]#tree /apps/redis/
/apps/redis
├── bin
│ ├── redis-benchmark
│ ├── redis-check-aof
│ ├── redis-check-rdb
│ ├── redis-cli
│ ├── redis-sentinel -> redis-server
│ └── redis-server
├── data
│ ├── appendonly6380.aof
│ ├── appendonly.aof
│ ├── nodes-6379.conf
│ └── nodes-6380.conf
├── etc
│ ├── redis6380.conf
│ └── redis.conf
├── log
│ ├── redis-6379.log
│ └── redis-6380.log
└── run
├── redis_6379.pid
└── redis_6380.pid
5 directories, 16 files准备redis-trib.rb工具
Redis 3和 4版本需要使用到集群管理工具redis-trib.rb，这个工具是redis官方推出的管理redis集群的
工具，集成在redis的源码src目录下，是基于redis提供的集群命令封装成简单、便捷、实用的操作工
具，redis-trib.rb是redis作者用ruby开发完成的，centos 7 系统yum安装的ruby存在版本较低问题，
如下：
[root@redis-node1 ~]#find / -name redis-trib.rb
/usr/local/src/redis-4.0.14/src/redis-trib.rb
[root@redis-node1 ~]#cp /usr/local/src/redis-4.0.14/src/redis-trib.rb /usr/bin/
[root@redis-node1 ~]#redis-trib.rb #缺少ruby环境无法运行rb脚本
/usr/bin/env: ruby: No such file or directory
#CentOS 7带的ruby版本过低,无法运行上面ruby脚本,需要安装2.3以上版本,安装rubygems依赖ruby自
动安装
[root@redis-node1 ~]#yum install rubygems -y
[root@redis-node1 ~]#gem install redis #gem相当于python里pip和linux的yum
Fetching: redis-4.1.3.gem (100%)
ERROR: Error installing redis:
redis requires Ruby version >= 2.3.0.解决ruby版本较低问题：
[root@redis-node1 ~]#yum -y install gcc openssl-devel zlib-devel
[root@redis-node1 ~]#wget https://cache.ruby-lang.org/pub/ruby/2.5/ruby-
2.5.5.tar.gz
[root@redis-node1 ~]#tar xf ruby-2.5.5.tar.gz
[root@redis-node1 ~]#cd ruby-2.5.5
[root@redis-node1 ruby-2.5.5]#./configure
[root@redis-node1 ruby-2.5.5]#make -j 2 && make install
[root@redis-node1 ruby-2.5.5]#which ruby
/usr/local/bin/ruby
[root@redis-node1 ruby-2.5.5]# ruby -v
ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-linux]
[root@redis-node1 ruby-2.5.5]#exit #注意需要重新登录redis-trib.rb 仍无法运行错误
[root@redis-node1 ~]#redis-trib.rb -h
Traceback (most recent call last):
2: from /usr/bin/redis-trib.rb:25:in `<main>\'
1: from /usr/local/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in
`require\'
/usr/local/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require\':
cannot load such file -- redis (LoadError)解决上述错误：
[root@redis-node1 ~]#gem install redis -v 4.1.3 #注意需要重新登录再执行,否则无法识别
到新ruby版本
Fetching: redis-4.1.3.gem (100%)
Successfully installed redis-4.1.3
Parsing documentation for redis-4.1.3
Installing ri documentation for redis-4.1.3
Done installing documentation for redis after 1 seconds
1 gem installed
#gem uninstall redis 可以卸载已安装好redis模块如果无法在线安装，可以下载redis模块安装包离线安装
#https://rubygems.org/gems/redis #先下载redis模块安装包
[root@redis-node1 ~]#gem install -l redis-4.1.3.gem #安装redis模块redis-trib.rb 命令用法
[root@redis-node1 ~]#redis-trib.rb
Usage: redis-trib <command> <options> <arguments ...>
create host1:port1 ... hostN:portN #创建集群
--replicas <arg> #指定每个master的副本数量,即对应slave数量,一般为1
check host:port #检查集群信息
info host:port #查看集群主机信息
fix host:port #修复集群
--timeout <arg>
reshard host:port #在线热迁移集群指定主机的slots数据
--from <arg>
--to <arg>
--slots <arg>
--yes
--timeout <arg>
--pipeline <arg>
rebalance host:port #平衡集群中各主机的slot数量
--weight <arg>
--auto-weights
--use-empty-masters
--timeout <arg>
--simulate
--pipeline <arg>
--threshold <arg>
add-node new_host:new_port existing_host:existing_port #添加主机到集群
--slave
--master-id <arg>
del-node host:port node_id #删除主机
set-timeout host:port milliseconds #设置节点的超时时间
call host:port command arg arg .. arg #在集群上的所有节点上执行命令
import host:port #导入外部redis服务器的数据到当前集群
--from <arg>
--copy
--replace
help (show this help)修改密码 redis 登录密码
#修改redis-trib.rb连接redis的密码
[root@redis ~]#vim /usr/local/lib/ruby/gems/2.5.0/gems/redis-
4.1.3/lib/redis/client.rb
创建redis cluster集群
#确保三台主机6个实例都启动状态
[root@redis-node1 ~]#systemctl is-active redis redis6380
active
active
[root@redis-node2 ~]#systemctl is-active redis redis6380
active
active
[root@redis-node3 ~]#systemctl is-active redis redis6380
active
active
#在第一个主机上执行下面操作
#--replicas 1 表示每个 master 分配一个 slave 节点,前三个节点自动划分为master,后面都为
slave节点
[root@redis-node1 ~]#redis-trib.rb create --replicas 1 10.0.0.7:6379
10.0.0.17:6379 10.0.0.27:6379 10.0.0.7:6380 10.0.0.17:6380 10.0.0.27:6380
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
10.0.0.7:6379
10.0.0.17:6379
10.0.0.27:6379
Adding replica 10.0.0.17:6380 to 10.0.0.7:6379
Adding replica 10.0.0.27:6380 to 10.0.0.17:6379
Adding replica 10.0.0.7:6380 to 10.0.0.27:6379
M: 739cb4c9895592131de418b8bc65990f81b75f3a 10.0.0.7:6379
slots:0-5460 (5461 slots) master
S: 0e0beba04cc98da02ebdb5225a11b84aa8062e10 10.0.0.7:6380
replicates a01fd3d81922d6752f7c960f1a75b6e8f28d911b
M: dddabb4e19235ec02ae96ab2ce67e295ce0274d7 10.0.0.17:6379
slots:5461-10922 (5462 slots) master
S: 34708909088ba562decbc1525a9606e088bdddf1 10.0.0.17:6380
replicates 739cb4c9895592131de418b8bc65990f81b75f3a
M: a01fd3d81922d6752f7c960f1a75b6e8f28d911b 10.0.0.27:6379
slots:10923-16383 (5461 slots) master
S: aefc6203958859024b8383b2fdb87b9e09411ccd 10.0.0.27:6380
replicates dddabb4e19235ec02ae96ab2ce67e295ce0274d7
Can I set the above configuration? (type \'yes\' to accept): yes #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 10.0.0.7:6379)
M: 739cb4c9895592131de418b8bc65990f81b75f3a 10.0.0.7:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 0e0beba04cc98da02ebdb5225a11b84aa8062e10 10.0.0.7:6380
slots: (0 slots) slave
replicates a01fd3d81922d6752f7c960f1a75b6e8f28d911b
S: 34708909088ba562decbc1525a9606e088bdddf1 10.0.0.17:6380
slots: (0 slots) slave
replicates 739cb4c9895592131de418b8bc65990f81b75f3a
S: aefc6203958859024b8383b2fdb87b9e09411ccd 10.0.0.27:6380
slots: (0 slots) slave
replicates dddabb4e19235ec02ae96ab2ce67e295ce0274d7
M: a01fd3d81922d6752f7c960f1a75b6e8f28d911b 10.0.0.27:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: dddabb4e19235ec02ae96ab2ce67e295ce0274d7 10.0.0.17:6379
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.如果有之前的操作导致Redis集群创建报错，则执行清空数据和集群命令：
127.0.0.1:6379> FLUSHALL
OK
127.0.0.1:6379> cluster reset
OK查看 redis cluster 集群状态
自动生成配置文件记录master/slave对应关系
[root@redis-node1 ~]#cat /apps/redis/data/nodes-6379.conf
0e0beba04cc98da02ebdb5225a11b84aa8062e10 10.0.0.7:6380@16380 slave
a01fd3d81922d6752f7c960f1a75b6e8f28d911b 0 1582383256000 5 connected
34708909088ba562decbc1525a9606e088bdddf1 10.0.0.17:6380@16380 slave
739cb4c9895592131de418b8bc65990f81b75f3a 0 1582383256216 4 connected
aefc6203958859024b8383b2fdb87b9e09411ccd 10.0.0.27:6380@16380 slave
dddabb4e19235ec02ae96ab2ce67e295ce0274d7 0 1582383257000 6 connected
739cb4c9895592131de418b8bc65990f81b75f3a 10.0.0.7:6379@16379 myself,master - 0
1582383256000 1 connected 0-5460
a01fd3d81922d6752f7c960f1a75b6e8f28d911b 10.0.0.27:6379@16379 master - 0
1582383258230 5 connected 10923-16383
dddabb4e19235ec02ae96ab2ce67e295ce0274d7 10.0.0.17:6379@16379 master - 0
1582383257223 3 connected 5461-10922
vars currentEpoch 6 lastVoteEpoch 0
[root@redis-node1 ~]#查看状态
[root@redis-node1 ~]#redis-trib.rb info 10.0.0.7:6379
10.0.0.7:6379 (739cb4c9...) -> 0 keys | 5461 slots | 1 slaves.
10.0.0.27:6379 (a01fd3d8...) -> 0 keys | 5461 slots | 1 slaves.
10.0.0.17:6379 (dddabb4e...) -> 0 keys | 5462 slots | 1 slaves.
[OK] 0 keys in 3 masters.
0.00 keys per slot on average.
[root@redis-node1 ~]#redis-trib.rb check 10.0.0.7:6379
>>> Performing Cluster Check (using node 10.0.0.7:6379)
M: 739cb4c9895592131de418b8bc65990f81b75f3a 10.0.0.7:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 0e0beba04cc98da02ebdb5225a11b84aa8062e10 10.0.0.7:6380
slots: (0 slots) slave
replicates a01fd3d81922d6752f7c960f1a75b6e8f28d911b
S: 34708909088ba562decbc1525a9606e088bdddf1 10.0.0.17:6380
slots: (0 slots) slave
replicates 739cb4c9895592131de418b8bc65990f81b75f3a
S: aefc6203958859024b8383b2fdb87b9e09411ccd 10.0.0.27:6380
slots: (0 slots) slave
replicates dddabb4e19235ec02ae96ab2ce67e295ce0274d7
M: a01fd3d81922d6752f7c960f1a75b6e8f28d911b 10.0.0.27:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: dddabb4e19235ec02ae96ab2ce67e295ce0274d7 10.0.0.17:6379
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.
[root@redis-node1 ~]#redis-cli -a 123456
Warning: Using a password with \'-a\' option on the command line interface may not
be safe.
127.0.0.1:6379> CLUSTER INFO
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:252
cluster_stats_messages_pong_sent:277
cluster_stats_messages_sent:529
cluster_stats_messages_ping_received:272
cluster_stats_messages_pong_received:252
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:529
127.0.0.1:6379>
[root@redis-node1 ~]#redis-cli -a 123456 -p 6379 CLUSTER NODES
Warning: Using a password with \'-a\' option on the command line interface may not
be safe.
29a83275db60f1c8f9f6d39b66cbc6c3d5cf20f1 10.0.0.7:6379@16379 myself,master - 0
1601985995000 1 connected 0-5460
3e607de412a8a240e8214c2d7a663cf1523412eb 10.0.0.17:6380@16380 slave
29a83275db60f1c8f9f6d39b66cbc6c3d5cf20f1 0 1601985997092 4 connected
17d0b29d2f50ea9c89d4e6e0cf3ee3ee4f7c4179 10.0.0.7:6380@16380 slave
90b206131d89b0812c626677343df9a11ff1d211 0 1601985995075 5 connected
90b206131d89b0812c626677343df9a11ff1d211 10.0.0.27:6379@16379 master - 0
1601985996084 5 connected 10923-16383
fb34c3a704aefb1e1ef2317b20598d6e1e51c010 10.0.0.17:6379@16379 master - 0
1601985995000 3 connected 5461-10922
c9ea6113a1992695fb86f5368fe6320349b0f8a6 10.0.0.27:6380@16380 slave
fb34c3a704aefb1e1ef2317b20598d6e1e51c010 0 1601985996000 6 connected
[root@redis-node1 ~]#redis-cli -a 123456 -p 6379 INFO replication
Warning: Using a password with \'-a\' option on the command line interface may not
be safe.
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.17,port=6380,state=online,offset=196,lag=0
master_replid:4ee36f9374c796ca4c65a0f0cb2c39304bb2e9c9
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:196
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:196
[root@redis-node1 ~]#redis-cli -a 123456 -p 6380 INFO replication
Warning: Using a password with \'-a\' option on the command line interface may not
be safe.
# Replication
role:slave
master_host:10.0.0.27
master_port:6379
master_link_status:up
master_last_io_seconds_ago:2
master_sync_in_progress:0
slave_repl_offset:224
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:dba41cb31c14de7569e597a3d8debc1f0f114c1e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:224
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:224python脚本实现RedisCluster集群写入
[root@redis-node1 ~]#yum -y install python3
[root@redis-node1 ~]#pip3 install redis-py-cluster
[root@redis-node1 ~]#vim redis_cluster_test.py
[root@redis-node1 ~]#cat ./redis_cluster_test.py
#!/usr/bin/env python3
from rediscluster import RedisCluster
startup_nodes = [
{"host":"10.0.0.7", "port":6379},
{"host":"10.0.0.7", "port":6380},
{"host":"10.0.0.17", "port":6379},
{"host":"10.0.0.17", "port":6380},
{"host":"10.0.0.27", "port":6379},
{"host":"10.0.0.27", "port":6380}
]
redis_conn= RedisCluster(startup_nodes=startup_nodes,password=\'123456\',
decode_responses=True)
for i in range(0, 10000):
redis_conn.set(\'key\'+str(i),\'value\'+str(i))
print(\'key\'+str(i)+\':\',redis_conn.get(\'key\'+str(i)))
[root@redis-node1 ~]#chmod +x redis_cluster_test.py
[root@redis-node1 ~]#./redis_cluster_test.py
......
key9998: value9998
key9999: value9999验证脚本写入的状态
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