准备工作
| 服务器 ip |
角色 |
| 192.168.20.1 |
主 |
| 192.168.20.2 |
从 |
| 192.168.20.3 |
从 |
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# docker 安装 redis
docker pull redis
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# 运行
分别从三台服务器运行 redis 镜像，注意映射不同外端口
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| docker run -p 6380:6379 --name redis -v /mydata/redis/data/redis.conf:/etc/redis/redis.conf -v /mydata/redis/data:/data -d redis redis-server /etc/redis/redis.conf --appendonly yes --daemonize no --masterauth #如果主节点设置了密码，请输入主服务密码
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docker exec -it redis_master /bin/bash
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# 查看角色
# 主：
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| 127.0.0.1:6379> auth #你的密码
OK
127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:0
master_failover_state:no-failover
master_replid:f28e9097e4c8cd3f67292181be12955909afd88e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
127.0.0.1:6379>
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# 从 01:
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| 127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:0
master_failover_state:no-failover
master_replid:48a7e3866afc4b6784ef49353b57fbc979ee2935
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
127.0.0.1:6379>
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# 从 02：
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| 127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:0
master_failover_state:no-failover
master_replid:de30809041f22f2dd6abc9cb34536f26df97e647
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
127.0.0.1:6379>
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# 在两台从服务器上执行命令 replicaof 192.168.20.1 6379
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| 127.0.0.1:6379> replicaof 192.168.20.1 6379
OK
127.0.0.1:6379>
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# 查看主服务信息
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| 127.0.0.1:6379> info replication
# Replication
role:master
#
connected_slaves:2
slave0:ip=172.17.0.3,port=6379,state=online,offset=1456,lag=1
slave1:ip=172.17.0.4,port=6379,state=online,offset=1456,lag=0
#
master_failover_state:no-failover
master_replid:9b8c2ef4539809505fa5bc1dd779c4500298011d
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1456
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1456
127.0.0.1:6379>
127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:0
master_failover_state:no-failover
master_replid:f28e9097e4c8cd3f67292181be12955909afd88e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
127.0.0.1:6379>
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# 测试：
主服务器上：
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| 127.0.0.1:6379> set name zs
OK
127.0.0.1:6379>
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# 从服务器也可以查看到信息
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| 127.0.0.1:6379> replicaof 192.168.20.1 6379
OK
127.0.0.1:6379> get name
"zs"
127.0.0.1:6379>
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# 异常统计：
可能遇到的 BUG：MASTER aborted replication with an error: NOAUTH Authentication required.
场景：在配置主从后发现两个从节点的 info replication 中出现：master_link_status:down
原因：大部分原因是因为主节点配置了密码
解决：在从节点的配置文件中加入 masterauth 你的主节点密码 即可
# 关于我
Brath 是一个热爱技术的 Java 程序猿，公众号「InterviewCoder」定期分享有趣有料的精品原创文章！
非常感谢各位人才能看到这里，原创不易，文章如果有帮助可以关注、点赞、分享或评论，这都是对我的莫大支持！
