How to view redis logs

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How to safely traverse Rediskey in production environment? Use the SCAN command. SCAN is a cursor iterative command of Redis, which traverses the key in incremental manner to avoid blocking the main thread. 1. Call the loop until the cursor is 0; 2. Set the COUNT parameter reasonably, default 10, and the amount of big data can be appropriately increased; 3. Filter specific mode keys in combination with MATCH; 4. Pay attention to the possible repeated return of keys, inability to ensure consistency, performance overhead and other issues; 5. Can be run during off-peak periods or processed asynchronously. For example: SCAN0MATChuser:*COUNT100.

To ensure Redis security, you need to configure from multiple aspects: 1. Restrict access sources, modify bind to specific IPs or combine firewall settings; 2. Enable password authentication, set strong passwords through requirepass and manage properly; 3. Close dangerous commands, use rename-command to disable high-risk operations such as FLUSHALL, CONFIG, etc.; 4. Enable TLS encrypted communication, suitable for high-security needs scenarios; 5. Regularly update the version and monitor logs to detect abnormalities and fix vulnerabilities in a timely manner. These measures jointly build the security line of Redis instances.

To configure the RDB snapshot saving policy for Redis, use the save directive in redis.conf to define the trigger condition. 1. The format is save. For example, save9001 means that if at least 1 key is modified every 900 seconds, it will be saved; 2. Select the appropriate value according to the application needs. High-traffic applications can set a shorter interval such as save101, and low-traffic can be extended such as save3001; 3. If automatic snapshots are not required, RDB can be disabled through save""; 4. After modification, restart Redis and monitor logs and system load to ensure that the configuration takes effect and does not affect performance.

The most direct way to list all keys in the Redis database is to use the KEYS* command, but it is recommended to use the SCAN command to traverse step by step in production environments. 1. The KEYS command is suitable for small or test environments, but may block services; 2. SCAN is an incremental iterator to avoid performance problems and is recommended for production environments; 3. The database can be switched through SELECT and the keys of different databases are checked one by one; 4. The production environment should also pay attention to key namespace management, regular export of key lists, and use monitoring tools to assist operations.

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Redis master-slave replication achieves data consistency through full synchronization and incremental synchronization. During the first connection, the slave node sends a PSYNC command, the master node generates an RDB file and sends it, and then sends the write command in the cache to complete the initialization; subsequently, incremental synchronization is performed by copying the backlog buffer to reduce resource consumption. Its common uses include read and write separation, failover preparation and data backup analysis. Notes include: ensuring network stability, reasonably configuring timeout parameters, enabling the min-slaves-to-write option according to needs, and combining Sentinel or Cluster to achieve high availability.

PSYNC is a partial resynchronization mechanism in Redis master-slave replication, which is used to synchronize only data lost during disconnection after the slave server is disconnected to improve synchronization efficiency. Its core relies on the ReplicationBacklog, which is a queue maintained by the main server. The default size is 1MB and saves the most recently executed write commands. When the slave server reconnects, a PSYNC command will be sent, and the master server will determine whether partial synchronization can be performed based on this: 1. The runid must be consistent; 2. Offset must be in the backlog buffer. If the condition is satisfied, data will continue to be sent from the offset, otherwise full synchronization will be triggered. Methods to improve the success rate of PSYNC include: 1. Appropriately increase repl-b