Redis 主从搭建

一. 同主机搭建Redis主从

1. 环境介绍

同机器 一主两从

2. 环境前准备工作

# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld# 修改 hostname
hostnamectl set-hostname xxxx  # 修改后退出当前终端重新连接即可# 更新下软件源
# 地址 https://developer.aliyun.com/mirror/# 时区调整，时间校准
date -R
timedatectl set-timezone Asia/Shanghai
yum -y install ntp
ntpdate ntp1.aliyun.com# 关闭 selinux： 
sed -i 's/enforcing/disabled/' /etc/selinux/config
setenforce 0

3. 安装 Redis 7.2.5

# 下载地址
http://download.redis.io/releases/# 下载
wget http://download.redis.io/releases/redis-7.2.5.tar.gz
# 解压
tar -xf redis-7.2.5.tar.gz -C /opt/redis# 编译
make MALLOC=libc# 安装 注意如果安装提示python3不存在 执行 yum install -y python3
make install PREFIX=/usr/local/redis# 配置环境变量
vi /etc/profile.d/redis.sh#!/bin/bashexport REDIS_HOME=/usr/local/redis
export PATH=$PATH:$REDIS_HOME/bin # 使其配置生效
source /etc/profile.d/redis.sh

4. redis 配置修改并且启动

4.1 修改配置文件

# 创建redis数据存储目录
mkdir -p /usr/local/redis/data/1637{0..2}
# 创建redis配置文件存储目录
mkdir -p /usr/local/redis/conf/1637{0..2}
# 创建redis日志存储目录
mkdir -p /usr/local/redis/log/1637{0..2}# 创建redis pid存储目录
mkdir /usr/local/redis/run# redis配置文件 16370
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.100   
# 端口　　
port 16370
# pid存储目录
pidfile /usr/local/redis/run/redis_16370.pid   
# 日志存储目录
logfile /usr/local/redis/log/16370/redis_16370.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16370
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes  # redis配置文件 16371
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.100   
# 端口　　
port 16371
# pid存储目录
pidfile /usr/local/redis/run/redis_16371.pid   
# 日志存储目录
logfile /usr/local/redis/log/16370/redis_16371.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16371
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes  # redis配置文件 16372
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.100   
# 端口　　
port 16372
# pid存储目录
pidfile /usr/local/redis/run/redis_16372.pid   
# 日志存储目录
logfile /usr/local/redis/log/16370/redis_16372.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16372
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes  # 复制下面命令即可
cat > /usr/local/redis/conf/redis_16370.conf <<EOF 
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.100   
# 端口　　
port 16370
# pid存储目录
pidfile /usr/local/redis/run/redis_16370.pid   
# 日志存储目录
logfile /usr/local/redis/log/16370/redis_16370.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16370
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes 
EOFcat > /usr/local/redis/conf/redis_16371.conf <<EOF 
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.100   
# 端口　　
port 16371
# pid存储目录
pidfile /usr/local/redis/run/redis_16371.pid   
# 日志存储目录
logfile /usr/local/redis/log/16370/redis_16371.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16371
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes 
EOFcat > /usr/local/redis/conf/redis_16372.conf <<EOF 
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.100   
# 端口　　
port 16372
# pid存储目录
pidfile /usr/local/redis/run/redis_16372.pid   
# 日志存储目录
logfile /usr/local/redis/log/16370/redis_16372.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16372
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes 
EOF

4.2 编写启动脚本

# 启动脚本
cat > /usr/local/redis/bin/master-slave_start.sh << EOF
#!/bin/bashredis-server /usr/local/redis/conf/redis_16370.conf
redis-server /usr/local/redis/conf/redis_16371.conf
redis-server /usr/local/redis/conf/redis_16372.conf
EOF# 赋予可执行权限
chmod +x /usr/local/redis/bin/master-slave_start.sh# 关闭脚本
vi /usr/local/redis/bin/master-slave_shutdown.sh#!/bin/bashkill -9 $(ps -ef | grep 1637 | grep -v grep | awk '{print $2}')# 赋予可执行权限
chmod +x /usr/local/redis/bin/master-slave_shutdown.sh

5. 开启主从

5.1 开启

# 以"192.168.1.100:16370"实例为主库，以"192.168.1.100:16371"实例和"192.168.1.100:16372"实例为从库。
# -a 参数指定密码
# 从库实例开启主从redis-cli -h 192.168.1.100 -p 16371 -a dongdong slaveof 192.168.1.100 16370redis-cli -h 192.168.1.100 -p 16372 -a dongdong slaveof 192.168.1.100 16370# Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.# 警告：在命令行界面上使用带有“-a”或“-u”选项的密码可能不安全。  可以忽略# 解决方式# redis-cli -h 192.168.1.100 -p 16371 -a dongdong --no-auth-warning  slaveof 192.168.1.100 16370 

5.2 主库实例查看主从信息

 redis-cli -h 192.168.1.100 -p 16370 -a dongdong  info replication [root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16370 -a dongdong  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:2
slave0:ip=192.168.1.100,port=16371,state=online,offset=8428,lag=0
slave1:ip=192.168.1.100,port=16372,state=online,offset=8428,lag=1
master_failover_state:no-failover
master_replid:a292603e2c96a6f451055e6d84a60795f81f2928
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:8428
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:8428

5.3 从库实例查看主从信息

# 192.168.1.100:16371 查看主从信息
redis-cli -h 192.168.1.100 -p 16371 -a dongdong  info replication [root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16371 -a dongdong  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:192.168.1.100
master_port:16370
master_link_status:up
master_last_io_seconds_ago:0
master_sync_in_progress:0
slave_read_repl_offset:8680
slave_repl_offset:8680
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:a292603e2c96a6f451055e6d84a60795f81f2928
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:8680
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:15
repl_backlog_histlen:8666

5.4 验证主从配置是否生效

# "192.168.1.100:16370"实例主库的11号数据库创建测试数据
redis-cli -h 192.168.1.100 -p 16370 -a dongdong -n 11[root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16370 -a dongdong -n 11
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.1.100:16370[11]> keys *
(empty array)
192.168.1.100:16370[11]> set name dongdong
OK
192.168.1.100:16370[11]> set age 18
OK
192.168.1.100:16370[11]> keys *
1) "age"
2) "name"# "192.168.1.100:16371"实例从库的11号数据库查看是否同步主库的11号数据库
redis-cli -h 192.168.1.100 -p 16371 -a dongdong -n 11[root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16371 -a dongdong -n 11
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.1.100:16371[11]> keys *
1) "name"
2) "age"
192.168.1.100:16371[11]> get name
"dongdong"
192.168.1.100:16371[11]> get age
"18"
192.168.1.100:16371[11]> # "192.168.1.100:16372"实例从库的11号数据库查看是否同步主库的11号数据库
redis-cli -h 192.168.1.100 -p 16372 -a dongdong -n 11[root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16372 -a dongdong -n 11
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.1.100:16372[11]> keys *
1) "age"
2) "name"
192.168.1.100:16372[11]> get name
"dongdong"
192.168.1.100:16372[11]> get age
"18"
192.168.1.100:16372[11]> 

6. 解除 192.168.1.100:16372 实例主从

# 192.168.1.100:16372 查看主从信息
redis-cli -h 192.168.1.100 -p 16372 -a dongdong  info replication [root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16372 -a dongdong  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:192.168.1.100
master_port:16370
master_link_status:up
master_last_io_seconds_ago:4
master_sync_in_progress:0
slave_read_repl_offset:10003
slave_repl_offset:10003
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:a292603e2c96a6f451055e6d84a60795f81f2928
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:10003
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:155
repl_backlog_histlen:9849#  192.168.1.100:16370 查看主从信息
redis-cli -h 192.168.1.100 -p 16370 -a dongdong  info replication 
[root@master-slave ~]#  redis-cli -h 192.168.1.100 -p 16370 -a dongdong  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:2
slave0:ip=192.168.1.100,port=16371,state=online,offset=10157,lag=0
slave1:ip=192.168.1.100,port=16372,state=online,offset=10157,lag=0
master_failover_state:no-failover
master_replid:a292603e2c96a6f451055e6d84a60795f81f2928
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:10157
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:10157# 解除 192.168.1.100:16372 主从信息
redis-cli -h 192.168.1.100 -p 16372 -a dongdong slaveof no one[root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16372 -a dongdong slaveof no one
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
OK# 再次查看 192.168.1.100:16370 查看主从信息
redis-cli -h 192.168.1.100 -p 16370 -a dongdong  info replication [root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16370 -a dongdong  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=192.168.1.100,port=16371,state=online,offset=10731,lag=0
master_failover_state:no-failover
master_replid:a292603e2c96a6f451055e6d84a60795f81f2928
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:10731
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:10731
# 只剩下一个 从节点了# 把192.168.1.100:16372 添加回来
redis-cli -h 192.168.1.100 -p 16372 -a dongdong slaveof 192.168.1.100 16370
[root@master-slave ~]#  redis-cli -h 192.168.1.100 -p 16372 -a dongdong slaveof 192.168.1.100 16370
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
OK# 此时再看192.168.1.100:16370 查看主从信息
redis-cli -h 192.168.1.100 -p 16370 -a dongdong  info replication [root@master-slave ~]# redis-cli -h 192.168.1.100 -p 16370 -a dongdong  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:2
slave0:ip=192.168.1.100,port=16371,state=online,offset=10941,lag=0
slave1:ip=192.168.1.100,port=16372,state=online,offset=10941,lag=0
master_failover_state:no-failover
master_replid:a292603e2c96a6f451055e6d84a60795f81f2928
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:10941
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:10941
# slaves 变成2了

二. 跨节点部署Redis主从

1. 环境介绍

2. 修改配置文件

2.1 master

# 创建redis数据存储目录
mkdir -p /usr/local/redis/data/16380
# 创建redis配置文件存储目录
mkdir -p /usr/local/redis/conf/16380
# 创建redis日志存储目录
mkdir -p /usr/local/redis/log/16380# 创建redis pid存储目录
mkdir /usr/local/redis/run# 复制下面命令即可
cat > /usr/local/redis/conf/redis_16380.conf<<EOF 
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.100   
# 端口　　
port 16380
# pid存储目录
pidfile /usr/local/redis/run/redis_16380.pid   
# 日志存储目录
logfile /usr/local/redis/log/redis_16380.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16380
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes 
EOF

2.2 slave 1

# 创建redis数据存储目录
mkdir -p /usr/local/redis/data/16381
# 创建redis配置文件存储目录
mkdir -p /usr/local/redis/conf/16381
# 创建redis日志存储目录
mkdir -p /usr/local/redis/log/16381# 创建redis pid存储目录
mkdir /usr/local/redis/run# 复制下面命令即可
cat > /usr/local/redis/conf/redis_16381.conf <<EOF 
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.200   
# 端口　　
port 16381
# pid存储目录
pidfile /usr/local/redis/run/redis_16381.pid   
# 日志存储目录
logfile /usr/local/redis/log/redis_16381.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16381
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes 
EOF

2.3 slave 2

# 创建redis数据存储目录
mkdir -p /usr/local/redis/data/16382
# 创建redis配置文件存储目录
mkdir -p /usr/local/redis/conf/16382
# 创建redis日志存储目录
mkdir -p /usr/local/redis/log/16382# 创建redis pid存储目录
mkdir /usr/local/redis/run# 复制下面命令即可
cat > /usr/local/redis/conf/redis_16382.conf <<EOF 
# 开启保护模式
protected-mode yes
# 添加本机的ip
bind 192.168.1.250   
# 端口　　
port 16382
# pid存储目录
pidfile /usr/local/redis/run/redis_16382.pid   
# 日志存储目录
logfile /usr/local/redis/log/redis_16382.log 
# 数据存储目录，目录要提前创建好
dir /usr/local/redis/data/16382
# 设置实例的验证口令
requirepass dongdong
# 以认证的方式连接到master。 如果master中使用了“密码保护”，slave必须交付正确的授权密码，才能连接成功。
# 此配置项中值需要和master机器的“requirepass”保持一致
masterauth dongdong
# 配置RDB持久化策略
save 900 1
save 300 10
save 60 10000
# 配置AOF持久化
appendonly yes 
appendfsync everysec
# 守护进程
daemonize yes 
EOF

3.启动Redis

3.1 master

redis-server  /usr/local/redis/conf/redis_16380.conf

3.2 slave 1

redis-server  /usr/local/redis/conf/redis_16381.conf

3.3 slave 2

redis-server  /usr/local/redis/conf/redis_16382.conf

4. 开启主从

4.1 slave 1

# 从库开启主从
redis-cli -h 192.168.1.200 -p 16381 -a dongdong slaveof 192.168.1.100 16380[root@slave1 ~]#  redis-cli -h 192.168.1.200 -p 16381 -a dongdong slaveof 192.168.1.100 16380
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
OK# 从库查看主从信息
redis-cli -h 192.168.1.200 -p 16381 -a dongdong  info replication [root@slave1 ~]# redis-cli -h 192.168.1.200 -p 16381 -a dongdong  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:192.168.1.100
master_port:16380
master_link_status:up
master_last_io_seconds_ago:3
master_sync_in_progress:0
slave_read_repl_offset:532
slave_repl_offset:532
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:7330881025ee2709ee6c9c32ea3fcc9b6649893d
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:532
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:15
repl_backlog_histlen:518

4.2 slave 2

# 从库开启主从
redis-cli -h 192.168.1.250 -p 16382 -a dongdong slaveof 192.168.1.100 16380[root@slave2 ~]# redis-cli -h 192.168.1.250 -p 16382 -a dongdong slaveof 192.168.1.100 16380
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
OK# 从库查看主从信息
redis-cli -h 192.168.1.250 -p 16382 -a dongdong  info replication [root@slave2 ~]# redis-cli -h 192.168.1.250 -p 16382 -a dongdong  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:192.168.1.100
master_port:16380
master_link_status:up
master_last_io_seconds_ago:10
master_sync_in_progress:0
slave_read_repl_offset:560
slave_repl_offset:560
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:7330881025ee2709ee6c9c32ea3fcc9b6649893d
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:560
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:211
repl_backlog_histlen:350

4.3 master

# 查看 主从信息
redis-cli -h 192.168.1.100 -p 16380 -a dongdong  info replication [root@master ~]# redis-cli -h 192.168.1.100 -p 16380 -a dongdong  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:2
slave0:ip=192.168.1.200,port=16381,state=online,offset=336,lag=0
slave1:ip=192.168.1.250,port=16382,state=online,offset=336,lag=1
master_failover_state:no-failover
master_replid:7330881025ee2709ee6c9c32ea3fcc9b6649893d
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

5. 验证主从配置是否生效

# "master主机名"实例主库的11号数据库创建测试数据
redis-cli -h 192.168.1.100 -p 16380 -a dongdong -n 11[root@master ~]# redis-cli -h 192.168.1.100 -p 16380 -a dongdong -n 11
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.1.100:16380[11]> keys *
(empty array)
192.168.1.100:16380[11]> set name dongdong
OK
192.168.1.100:16380[11]> set age 18
OK
192.168.1.100:16380[11]> keys *
1) "name"
2) "age"
192.168.1.100:16380[11]> # "slave1主机名"实例从库的11号数据库查看是否同步主库的11号数据库
redis-cli -h 192.168.1.200 -p 16381 -a dongdong -n 11[root@slave1 ~]# redis-cli -h 192.168.1.200 -p 16381 -a dongdong -n 11
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.1.200:16381[11]> get name
"dongdong"
192.168.1.200:16381[11]> get age
"18"
192.168.1.200:16381[11]> key *
(error) ERR unknown command 'key', with args beginning with: '*' 
192.168.1.200:16381[11]> keys *
1) "age"
2) "name"
192.168.1.200:16381[11]> # "slave2主机名"实例从库的11号数据库查看是否同步主库的11号数据库
redis-cli -h 192.168.1.250 -p 16382 -a dongdong -n 11[root@slave2 ~]# redis-cli -h 192.168.1.250 -p 16382 -a dongdong -n 11
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.1.250:16382[11]> get name 
"dongdong"
192.168.1.250:16382[11]> get age
"18"
192.168.1.250:16382[11]> keys *
1) "age"
2) "name"
192.168.1.250:16382[11]> # 如果针对 slave1 或者 slave2 进行写入操作 则会报错 错误信息  只能在master操作哦
(error) READONLY You can't write against a read only replica.