什么是 redis ?
Redis是一个开源的、遵循BSD协议的、基于内存的而且目前比较流行的键值数据库(key-value database)，是一个非关系型数据库，redis 提供将内存通过网络远程共享的一种服务，提供类似功能的还有memcached，但相比memcached，redis还提供了易扩展、高性能、具备数据持久性等功能。
Redis 在高并发、低延迟环境要求比较高的环境使用量非常广泛。
环境准备：
母盘：RHEL9 ---> 1G，1内核
克隆：redis-node1（172.25.254.10）、redis-node2（172.25.254.20）、redis-node3（172.25.254.30）
vmset.sh eth0 172.25.254.10 redis-node1.test.org
vmset.sh eth0 172.25.254.20 redis-node1.test.org
vmset.sh eth0 172.25.254.30 redis-node1.test.org
redis安装
bash
[root@redis-node1 ~]# tar zxf redis-7.4.0.tar.gz
[root@redis-node1 ~]# cd redis-7.4.0/
[root@redis-node1 redis-7.4.0]# dnf install make -y
[root@redis-node1 redis-7.4.0]# dnf install initscripts -y
[root@redis-node1 redis-7.4.0]# ll /etc/init.d/
[root@redis-node1 redis-7.4.0]# dnf install gcc -y
[root@redis-node1 redis-7.4.0]# make && make install
[root@redis-node1 redis-7.4.0]# cd utils/
[root@redis-node1 utils]# vim install_server.sh
[root@redis-node1 utils]# ./install_server.sh
#一路回车
bash
[root@redis-node1 utils]# vim /etc/redis/6379.conf
[root@redis-node1 utils]# /etc/init.d/redis_6379 restart
bash
[root@redis-node1 utils]# cd
[root@redis-node1 ~]# scp -r redis-7.4.0 root@172.25.254.20:/root
[root@redis-node1 ~]# scp -r redis-7.4.0 root@172.25.254.30:/root
[root@redis-node1 ~]# cd /usr/local/bin/
#10~30:都需要安装rsync
[root@redis-node1 bin]# dnf install rsync -y
[root@redis-node1 bin]# rsync -al * root@172.25.254.20:/usr/local/bin
[root@redis-node1 bin]# rsync -al * root@172.25.254.30:/usr/local/bin
bash
[root@redis-node2 ~]# dnf install initscripts -y
[root@redis-node2 ~]# dnf install rsync -y
[root@redis-node2 ~]# cd redis-7.4.0/
[root@redis-node2 redis-7.4.0]# cd utils/
[root@redis-node2 utils]# ./install_server.sh
Welcome to the redis service installer
This script will help you easily set up a running redis server
Please select the redis port for this instance: [6379]
Selecting default: 6379
Please select the redis config file name [/etc/redis/6379.conf]
Selected default - /etc/redis/6379.conf
Please select the redis log file name [/var/log/redis_6379.log]
Selected default - /var/log/redis_6379.log
Please select the data directory for this instance [/var/lib/redis/6379]
Selected default - /var/lib/redis/6379
Please select the redis executable path [/usr/local/bin/redis-server]
Selected config:
Port : 6379
Config file : /etc/redis/6379.conf
Log file : /var/log/redis_6379.log
Data dir : /var/lib/redis/6379
Executable : /usr/local/bin/redis-server
Cli Executable : /usr/local/bin/redis-cli
Is this ok? Then press ENTER to go on or Ctrl-C to abort.
Copied /tmp/6379.conf => /etc/init.d/redis_6379
Installing service...
Successfully added to chkconfig!
Successfully added to runlevels 345!
Starting Redis server...
Installation successful!
[root@redis-node2 utils]#
[root@redis-node2 utils]# vim /etc/redis/6379.conf
[root@redis-node2 utils]# /etc/init.d/redis_6379 restart
Stopping ...
Redis stopped
Starting Redis server...
bash
[root@redis-node3 ~]# dnf install initscripts -y
[root@redis-node3 ~]# dnf install rsync -y
[root@redis-node3 ~]# cd redis-7.4.0/
[root@redis-node3 redis-7.4.0]# cd utils/
[root@redis-node3 utils]# ./install_server.sh
Welcome to the redis service installer
This script will help you easily set up a running redis server
Please select the redis port for this instance: [6379]
Selecting default: 6379
Please select the redis config file name [/etc/redis/6379.conf]
Selected default - /etc/redis/6379.conf
Please select the redis log file name [/var/log/redis_6379.log]
Selected default - /var/log/redis_6379.log
Please select the data directory for this instance [/var/lib/redis/6379]
Selected default - /var/lib/redis/6379
Please select the redis executable path [/usr/local/bin/redis-server]
Selected config:
Port : 6379
Config file : /etc/redis/6379.conf
Log file : /var/log/redis_6379.log
Data dir : /var/lib/redis/6379
Executable : /usr/local/bin/redis-server
Cli Executable : /usr/local/bin/redis-cli
Is this ok? Then press ENTER to go on or Ctrl-C to abort.
Copied /tmp/6379.conf => /etc/init.d/redis_6379
Installing service...
Successfully added to chkconfig!
Successfully added to runlevels 345!
Starting Redis server...
Installation successful!
[root@redis-node3 utils]#
[root@redis-node3 utils]# vim /etc/redis/6379.conf
[root@redis-node3 utils]# /etc/init.d/redis_6379 restart
Stopping ...
Redis stopped
Starting Redis server...redis的主从复制
bash
[root@redis-node2 utils]# vim /etc/redis/6379.conf
[root@redis-node2 utils]# /etc/init.d/redis_6379 restart
Stopping ...
Redis stopped
Starting Redis server...
[root@redis-node2 utils]#
[root@redis-node2 utils]# redis-cli
127.0.0.1:6379> get name
"lee"
bash
[root@redis-node3 utils]# vim /etc/redis/6379.conf
[root@redis-node3 utils]# /etc/init.d/redis_6379 restart
Stopping ...
Redis stopped
Starting Redis server...
[root@redis-node3 utils]#
[root@redis-node3 utils]# redis-cli
127.0.0.1:6379> get name
"lee"
redis哨兵
bash
[root@redis-node1 ~]# ls
anaconda-ks.cfg redis-7.4.0 redis-7.4.0.tar.gz
[root@redis-node1 ~]# cd redis-7.4.0/
[root@redis-node1 redis-7.4.0]# ls
00-RELEASENOTES INSTALL redis.conf runtest-sentinel TLS.md
BUGS LICENSE.txt REDISCONTRIBUTIONS.txt SECURITY.md utils
CODE_OF_CONDUCT.md Makefile runtest sentinel.conf
CONTRIBUTING.md MANIFESTO runtest-cluster src
deps README.md runtest-moduleapi tests
[root@redis-node1 redis-7.4.0]# cp sentinel.conf /etc/redis/
[root@redis-node1 redis-7.4.0]# vim /etc/redis/sentinel.conf
[root@redis-node1 redis-7.4.0]# scp /etc/redis/sentinel.conf root@172.25.254.20:/etc/redis/sentinel.conf
root@172.25.254.20's password:
sentinel.conf 100% 14KB 10.6MB/s 00:00
[root@redis-node1 redis-7.4.0]# scp /etc/redis/sentinel.conf root@172.25.254.30:/etc/redis/sentinel.conf
root@172.25.254.30's password:
sentinel.conf 100% 14KB 10.5MB/s 00:00
[root@redis-node1 redis-7.4.0]#
[root@redis-node1 redis-7.4.0]# cd /etc/redis/
[root@redis-node1 redis]# ls
6379.conf sentinel.conf
[root@redis-node1 redis]# cp sentinel.conf sentinel.conf.bak
[root@redis-node1 redis]# redis-sentinel /etc/redis/sentinel.conf
bash
[root@redis-node2 ~]# cd /etc/redis/
[root@redis-node2 redis]# ls
6379.conf sentinel.conf
[root@redis-node2 redis]# cp sentinel.conf sentinel.conf.bak
[root@redis-node2 redis]# redis-sentinel /etc/redis/sentinel.conf
bash
[root@redis-node3 ~]# cd /etc/redis/
[root@redis-node3 redis]# ls
6379.conf sentinel.conf
[root@redis-node3 redis]# cp sentinel.conf sentinel.conf.bak
[root@redis-node3 redis]# redis-sentinel /etc/redis/sentinel.conf
测试：
redis cluster
克隆：redis-node110、redis-node120、redis-node130
vmset.sh eth0 172.25.254.110 redis-node110.test.org
vmset.sh eth0 172.25.254.120 redis-node120.test.org
vmset.sh eth0 172.25.254.130 redis-node130.test.org
bash
[root@redis-node1 redis]# cd /root/redis-7.4.0/
[root@redis-node1 redis-7.4.0]# /etc/init.d/redis_6379 stop
Stopping ...
Redis stopped
[root@redis-node1 redis-7.4.0]# ps aux | grep redis
root 7666 0.0 0.3 6408 2296 pts/1 S+ 18:42 0:00 grep --color=auto redis
[root@redis-node1 redis-7.4.0]# make uninstall
cd src && make uninstall
make[1]: Entering directory '/root/redis-7.4.0/src'
rm -f /usr/local/bin/{redis-server,redis-benchmark,redis-cli,redis-check-rdb,redis-check-aof,redis-sentinel}
make[1]: Leaving directory '/root/redis-7.4.0/src'
[root@redis-node1 redis-7.4.0]#
[root@redis-node1 redis-7.4.0]# cd
[root@redis-node1 ~]# dnf install redis -y
[root@redis-node1 ~]# vim /etc/redis/redis.conf
[root@redis-node1 ~]# systemctl enable --now redis
Created symlink /etc/systemd/system/multi-user.target.wants/redis.service → /usr/lib/systemd/system/redis.service.
[root@redis-node1 ~]# systemctl restart redis.service
[root@redis-node1 ~]# netstat -antlupe | grep redis
tcp 0 0 0.0.0.0:16379 0.0.0.0:* LISTEN 991 40761 7919/redis-server *
tcp 0 0 0.0.0.0:6379 0.0.0.0:* LISTEN 991 40759 7919/redis-server *
tcp6 0 0 :::16379 :::* LISTEN 991 40762 7919/redis-server *
tcp6 0 0 :::6379 :::* LISTEN 991 40760 7919/redis-server *
[root@redis-node1 ~]#
[root@redis-node1 ~]# redis-cli
-bash: /usr/local/bin/redis-cli: No such file or directory
[root@redis-node1 ~]# exit
[root@redis-node1 ~]# redis-cli
127.0.0.1:6379> auth 123456
OK
127.0.0.1:6379> keys *
(empty array)
[root@redis-node1 ~]# for i in 20 30 110 120 130
> do
> scp /etc/redis/redis.conf root@172.25.254.$i:/etc/redis/redis.conf
> done
bash
[root@redis-node2 redis-7.4.0]# cd
[root@redis-node2 ~]# dnf install redis -y
[root@redis-node2 ~]# vim /etc/hosts
[root@redis-node2 ~]# systemctl enable --now redis
[root@redis-node2 ~]# exit
[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> set name lee
OK
bash
[root@redis-node3 redis-7.4.0]# cd
[root@redis-node3 ~]# dnf install redis -y
[root@redis-node3 ~]# vim /etc/hosts
[root@redis-node3 ~]# systemctl enable --now redis
[root@redis-node3 ~]# exit
[root@redis-node3 ~]# 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> get name
(error) MOVED 5798 172.25.254.20:6379
bash
[root@redis-node110 ~]# dnf install redis -y
[root@redis-node110 ~]# vim /etc/hosts
[root@redis-node110 ~]# systemctl enable --now redis
bash
[root@redis-node120 ~]# dnf install redis -y
[root@redis-node120 ~]# vim /etc/hosts
[root@redis-node120 ~]# systemctl enable --now redis
bash
[root@redis-node130 ~]# dnf install redis -y
[root@redis-node130 ~]# vim /etc/hosts
[root@redis-node130 ~]# systemctl enable --now redis
bash
[root@redis-node1 ~]# redis-cli --cluster create -a 123456 \
> 172.25.254.10:6379 172.25.254.20:6379 172.25.254.30:6379 \
> 172.25.254.110:6379 172.25.254.120:6379 172.25.254.130:6379 \
> --cluster-replicas 1
...
>>> Performing Cluster Check (using node 172.25.254.10:6379)
M: 51942ff68767525da5b43516d5a1ac6d3a4236c0 172.25.254.10:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
S: f775d5a125e9056a699f6ef324566e3024c8eba4 172.25.254.110:6379
slots: (0 slots) slave
replicates 53eaf5b37b8961c67beed67abe67a4fdb568ba06
S: 2a8f1dfd906a1638fdcfc771dc24f00a21b5e8bf 172.25.254.120:6379
slots: (0 slots) slave
replicates 51942ff68767525da5b43516d5a1ac6d3a4236c0
M: bd12ca08ea95bdc5abb1f52e35d6bb825611ba72 172.25.254.20:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
M: 53eaf5b37b8961c67beed67abe67a4fdb568ba06 172.25.254.30:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: aafeaea3cf23aa110960219c8b000946d94dd8a8 172.25.254.130:6379
slots: (0 slots) slave
replicates bd12ca08ea95bdc5abb1f52e35d6bb825611ba72
...
#20被推选，所以10不能创建
[root@redis-node1 ~]# 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> set name lee
(error) MOVED 5798 172.25.254.20:6379
集群扩容
克隆：redis50、redis150 #都是1G 1内核
vmset.sh eth0 172.25.254.50 redis50.silingchuan.org
vmset.sh eth0 172.25.254.150 redis150.silingchuan.org
50 150：
dnf install redis -y
bash
[root@redis-node2 ~]# scp /etc/redis/redis.conf root@172.25.254.50:/etc/redis/redis.conf
[root@redis-node2 ~]# scp /etc/redis/redis.conf root@172.25.254.150:/etc/redis/redis.conf
bash
[root@redis-node50 ~]# dnf install redis -y
[root@redis-node50 ~]# systemctl start redis
bash
[root@redis-node150 ~]# dnf install redis -y
[root@redis-node150 ~]# systemctl start redis新增50master
bash
[root@redis-node2 ~]# redis-cli -a 123456 --cluster add-node 172.25.254.50:6379 172.25.254.20:6379
[root@redis-node2 ~]# redis-cli -a 123456 --cluster check 172.25.254.10:6379
共享槽位
bash
[root@redis-node2 ~]# redis-cli -a 123456 --cluster reshard 172.25.254.20:6379(4096 50-ID all yes)
新增150slave
bash
[root@redis-node2 ~]# redis-cli -a 123456 --cluster add-node 172.25.254.150:6379 172.25.254.20:6379 --cluster-slave --cluster-master-id 2ce4bedb48252ca1c7030586d45d1b271490176a
移除150：
bash
[root@redis-node2 ~]# redis-cli -a 123456 --cluster del-node 172.25.254.150:6379 6ab4d6ec8aab005c3934f6bfa272a6be77545cbb
清空槽位：
bash
[root@redis-node2 ~]# redis-cli -a 123456 --cluster reshard 172.25.254.20:6379(4096 20-ID 50-ID done yes)
移除50：
bash
[root@redis-node2 ~]# redis-cli -a 123456 --cluster del-node 172.25.254.50:6379 2ce4bedb48252ca1c7030586d45d1b271490176a