redis master copy slave

本文介绍了Redis主从配置的实际操作,包括本地测试环境与阿里云远程服务器的具体设置。文中特别强调了安全性和数据同步的问题,并提到了无密码验证模式下可能存在的风险。

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测试本机127.0.0.1:6379 slave
远程阿里云39.108.81.142:6379 master

无密码模式验证。

正常情况下需要密码验证的,因为master一旦宕机的时候,清库了,如果slave链接上经过同步,数据也没了。
另外就是安全考虑,这会估计谁都能访问master。弱弱的说,我已经删除了。

### Redis Master-Slave Replication Implementation Principle In Redis master-slave replication, data from one server (the master) is replicated to another server (the slave). This process ensures high availability and redundancy within a database setup. When a client writes data to the master, this information must propagate to all connected slaves. The initial synchronization between master and slave involves several steps: - **Full Resynchronization**: Upon first connection or when significant changes occur, the slave requests a full copy of the dataset held by the master. To achieve this efficiently without blocking operations on either side, Redis uses RDB snapshots[^1]. During this phase, the master creates an RDB file while continuing normal operation; once completed, it sends over the entire snapshot along with any commands received during creation time via buffered updates. After establishing the base state through resynchronization, incremental updates maintain consistency: - **Partial Resynchronizations Using Backlog Buffer**: For ongoing communication after the initial sync, both master and slave keep track of every write command executed using repl_backlog buffer which stores recent history of written instructions. If disconnection happens temporarily, upon reconnection instead of doing complete resync again, they attempt partial resynchronization where only missing commands since last successful transmission are transferred based on offset tracking mechanism provided by `psync` protocol introduced in version 2.8. To ensure fault tolerance further, mechanisms like forced manual failovers allow replicas under certain conditions to promote themselves into mastership roles should primary node failures happen unexpectedly as described elsewhere: ```bash CLUSTER FAILOVER TAKEOVER ``` This command specifically targets replica nodes instructing them to initiate takeover procedures for failing primaries ensuring minimal downtime and continuous service provision even amidst hardware faults or network partitions scenarios. --related questions-- 1. How does Redis handle read/write splitting between master and slave? 2. What role do heartbeats play in maintaining connections between Redis master and slave nodes? 3. Can you explain how Redis cluster mode differs from simple master-slave setups regarding replication strategies? 4. In what situations would a developer prefer synchronous versus asynchronous replication methods offered by Redis?
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