How to view Redis cluster status
Redis clusters provide a way to manage distributed Redis instances to ensure high availability and scalability. To view the status of the cluster, you can use the following steps:
1. Connect to the cluster
Use the redis-cli tool to connect to a master node in the cluster:
<code>redis-cli -c -h -p </code>
2. Check the cluster status
Execute the <code>CLUSTER INFO</code> command:
<code>CLUSTER INFO</code>
3. Understand the output
The output will provide detailed information about the cluster state, including:
- cluster_state: The current state of the cluster, such as active, failover, disconnected, etc.
- cluster_slots: 16384 slots assigned to cluster nodes.
- cluster_nodes: Information about all nodes in the cluster, including their IP, port, role, and status.
- cluster_current_epoch: The current epoch of the cluster, used to determine the master and slave nodes.
- cluster_config_epoch: Era of cluster configuration, used to track changes in cluster metadata.
4. Check node details
To view detailed information about a specific node, use the CLUSTER NODES command followed by the node ID:
<code>CLUSTER NODES </code>
The output will provide information about the role, status, and connections to other nodes.
5. Check slot assignment
To see how slots are assigned to cluster nodes, use the <code>CLUSTER SLOTS</code> command:
<code>CLUSTER SLOTS</code>
The output will display the owner node and backup node for each slot.
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