How to view the redis master-slave switch
To view the Redis master-slave switching status, you can use the "INFO replication" command to view the master-slave replication status information, including node roles, master node addresses, and ports; use the Redis monitoring tool to view the cluster status, obtain user-friendly interfaces and detailed metrics; view log files, obtain detailed information about master-slave switching events.
How to view Redis master-slave switches
When a Redis master fails, the slave node will automatically be promoted to the master node to ensure data availability and consistency. During the master-slave switch, it is crucial to view the switch status to ensure the cluster is running properly.
How to view the Redis master-slave switch state:
1. Through the Redis command
Connect to the Redis server and execute the following command:
<code>INFO replication</code>
Information about the master-slave replication status will be displayed in the output information, including:
- role: The role of the current node (master/slave)
- master_host: The IP address or host name of the master node
- master_port: the port number of the master node
2. Through monitoring tools
You can view the status of a Redis cluster through monitoring tools, such as Redis Sentinel or RedisInsight. These tools provide a friendly user interface that displays detailed status and metrics for each node in the cluster.
3. Log files
The Redis server logs events about master-slave switching in a log file, usually located in /var/log/redis/redis.log (or similar path). Viewing the log file can provide detailed information about the switching process.
Sample output:
Here is an example output for viewing the master-slave switching state using the "INFO replication" command:
<code>role:slave master_host:127.0.0.1 master_port:6379</code>
This output means that the current node is a backup node, the IP address of the primary node is "127.0.0.1", and the port number is "6379".
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