Redis教程
redis-cluste
环境： centos 7.9
ip: 192.168.138.21
Redis server v=4.0.8
同步一台服务器上，指定不同的端口启动redis-server，redis.conf基础配置文件信息如下
# cat redis-7000.conf
port 7000
daemonize yes
logfile /applications/redis/redis-7000.log
dir /applications/redis/
dbfilename 7000-dump.rdb
cluster-enabled yes
# cluster-config-file nodes*.conf 名称要不一样
cluster-config-file nodes-7000.conf
cluster-node-timeout 5000
appendonly yes
appendfilename "appendonly-7000.aof"
# 拷贝redis-7000.conf 至redis-7005.conf
[root@ansb01 redis]# cp redis-7000.conf redis-7001.conf
[root@ansb01 redis]# cp redis-7000.conf redis-7002.conf
[root@ansb01 redis]# cp redis-7000.conf redis-7003.conf
[root@ansb01 redis]# cp redis-7000.conf redis-7004.conf
[root@ansb01 redis]# cp redis-7000.conf redis-7005.conf
# 修改对应端口配置文件
[root@ansb01 redis]# sed -i 's/7000/7001/g' redis-7001.conf
[root@ansb01 redis]# sed -i 's/7000/7002/g' redis-7002.conf
[root@ansb01 redis]# sed -i 's/7000/7003/g' redis-7003.conf
[root@ansb01 redis]# sed -i 's/7000/7004/g' redis-7004.conf
[root@ansb01 redis]# sed -i 's/7000/7005/g' redis-7005.conf
分别启动不同端口服务，查看服务信息
# 查看redis [root@ansb01 redis]# ps -ef|grep redis root 5245 1 0 21:55 ? 00:00:01 ./bin/redis-server *:7000 [cluster] root 5348 1 0 22:05 ? 00:00:00 ./bin/redis-server *:7001 [cluster] root 5357 1 0 22:05 ? 00:00:00 ./bin/redis-server *:7002 [cluster] root 5365 1 0 22:06 ? 00:00:00 ./bin/redis-server *:7003 [cluster] root 5374 1 0 22:06 ? 00:00:00 ./bin/redis-server *:7004 [cluster] root 5380 1 0 22:06 ? 00:00:00 ./bin/redis-server *:7005 [cluster]
准备redis-trib.rb运行环境
wget https://cache.ruby-lang.org/pub/ruby/2.5/ruby-2.5.1.tar.gz yum -y install zlib-devel tar xvf ruby-2.5.1.tar.gz 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 wget http://rubygems.org/downloads/redis-3.3.0.gem gem install -l redis-3.3.0.gem
redis-trib.rb支持的操作
[root@ansb01 src]# ./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：创建集群
2. check：检查集群
3. info：查看集群信息
4. fix：修复集群
5. reshard：在线迁移slot
6. rebalance：平衡集群节点slot数量
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：在集群所有节点上执行命令
11. import：将外部redis数据导入集群
创建集群
如果您使用 Redis 5 或更高版本，这很容易实现，因为我们在 Redis Cluster 命令行实用程序的帮助下嵌入到 中redis-cli，可用于创建新集群、检查或重新分片现有集群等。
对于 Redis 版本 3 或 4，有一个redis-trib.rb非常相似的旧工具。您可以src在Redis源代码分发目录中找到它。您需要安装redisgem 才能运行redis-trib.
# 使用redis-trib.rb用于Redis的4或3型： [root@ansb01 src]# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 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 >>> Creating cluster >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 Adding replica 127.0.0.1:7004 to 127.0.0.1:7000 Adding replica 127.0.0.1:7005 to 127.0.0.1:7001 Adding replica 127.0.0.1:7003 to 127.0.0.1:7002 >>> Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same host as their master M: 5cf0519f5067742f75bc84d3d9f6c6d9521fe95e 127.0.0.1:7000 slots:0-5460 (5461 slots) master M: 2f6aa651087e63d5e97a03b7cdd1917fe0010ffa 127.0.0.1:7001 slots:5461-10922 (5462 slots) master M: c56b3b07bec108fe51aa68214b93b4b0a6999798 127.0.0.1:7002 slots:10923-16383 (5461 slots) master S: 0ee1eac88e12ba1f0305f8adcb3f8212731a68cf 127.0.0.1:7003 replicates 2f6aa651087e63d5e97a03b7cdd1917fe0010ffa S: 5891169f86b44ac812fab99594d81bd9f8a3081c 127.0.0.1:7004 replicates c56b3b07bec108fe51aa68214b93b4b0a6999798 S: 8fd12dd488bcd226202ffb0814f8c5d57b62ffb3 127.0.0.1:7005 replicates 5cf0519f5067742f75bc84d3d9f6c6d9521fe95e 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 127.0.0.1:7000) M: 5cf0519f5067742f75bc84d3d9f6c6d9521fe95e 127.0.0.1:7000 slots:0-5460 (5461 slots) master 1 additional replica(s) S: 5891169f86b44ac812fab99594d81bd9f8a3081c 127.0.0.1:7004 slots: (0 slots) slave replicates c56b3b07bec108fe51aa68214b93b4b0a6999798 M: 2f6aa651087e63d5e97a03b7cdd1917fe0010ffa 127.0.0.1:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s) S: 8fd12dd488bcd226202ffb0814f8c5d57b62ffb3 127.0.0.1:7005 slots: (0 slots) slave replicates 5cf0519f5067742f75bc84d3d9f6c6d9521fe95e M: c56b3b07bec108fe51aa68214b93b4b0a6999798 127.0.0.1:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: 0ee1eac88e12ba1f0305f8adcb3f8212731a68cf 127.0.0.1:7003 slots: (0 slots) slave replicates 2f6aa651087e63d5e97a03b7cdd1917fe0010ffa [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
# 查看集群信息 [root@ansb01 redis]# ./bin/redis-cli -p 7000 cluster info cluster_state:ok # 状态为ok cluster_slots_assigned:16384 # 标记slot共有16384 cluster_slots_ok:16384 # 已分配slot有16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:6 # 当前集群有6个节点 cluster_size:3 cluster_current_epoch:6 cluster_my_epoch:1 cluster_stats_messages_ping_sent:576 cluster_stats_messages_pong_sent:603 cluster_stats_messages_sent:1179 cluster_stats_messages_ping_received:598 cluster_stats_messages_pong_received:576 cluster_stats_messages_meet_received:5 cluster_stats_messages_received:1179 # 查看当前集群节点信息 [root@ansb01 redis]# ./bin/redis-cli -p 7000 cluster nodes 5891169f86b44ac812fab99594d81bd9f8a3081c 127.0.0.1:7004@17004 slave c56b3b07bec108fe51aa68214b93b4b0a6999798 0 1631718314377 5 connected 2f6aa651087e63d5e97a03b7cdd1917fe0010ffa 127.0.0.1:7001@17001 master - 0 1631718314000 2 connected 5461-10922 8fd12dd488bcd226202ffb0814f8c5d57b62ffb3 127.0.0.1:7005@17005 slave 5cf0519f5067742f75bc84d3d9f6c6d9521fe95e 0 1631718314000 6 connected c56b3b07bec108fe51aa68214b93b4b0a6999798 127.0.0.1:7002@17002 master - 0 1631718314000 3 connected 10923-16383 5cf0519f5067742f75bc84d3d9f6c6d9521fe95e 127.0.0.1:7000@17000 myself,master - 0 1631718315000 1 connected 0-5460 0ee1eac88e12ba1f0305f8adcb3f8212731a68cf 127.0.0.1:7003@17003 slave 2f6aa651087e63d5e97a03b7cdd1917fe0010ffa 0 1631718315399 4 connected
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