RedisHow-ToBeginner · 4 min read

How to Monitor Redis: Commands and Tools Explained

To monitor Redis, use the built-in INFO command to get server statistics and MONITOR to see real-time commands. You can also use external tools like RedisInsight or Prometheus exporters for detailed monitoring and visualization.

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Syntax

The main Redis commands for monitoring are:

INFO [section]: Returns server statistics and information. You can specify a section like memory, stats, or clients.
MONITOR: Streams every command processed by the Redis server in real-time.
CLIENT LIST: Shows connected clients and their details.

redis

INFO
INFO memory
MONITOR
CLIENT LIST

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Example

This example shows how to use the INFO command to get memory usage and the MONITOR command to watch commands in real-time.

redis

127.0.0.1:6379> INFO memory
# Memory
used_memory:1024000
used_memory_human:1000K
used_memory_rss:2048000
used_memory_peak:1500000

127.0.0.1:6379> MONITOR
+1617181920.123456 [0 127.0.0.1:6379] "SET" "key1" "value1"
+1617181921.123789 [0 127.0.0.1:6379] "GET" "key1"

Output

# Memory used_memory:1024000 used_memory_human:1000K used_memory_rss:2048000 used_memory_peak:1500000 +1617181920.123456 [0 127.0.0.1:6379] "SET" "key1" "value1" +1617181921.123789 [0 127.0.0.1:6379] "GET" "key1"

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Common Pitfalls

Common mistakes when monitoring Redis include:

Using MONITOR on a production server without caution, as it can slow down Redis due to the high volume of data streamed.
Not filtering INFO output by sections, which can make it hard to find relevant data.
Ignoring client connections with CLIENT LIST, which can help identify slow or stuck clients.

redis

Wrong:
MONITOR

Right:
INFO memory
CLIENT LIST

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Quick Reference

Command	Purpose
INFO [section]	Get server stats and info, e.g., memory, clients, stats
MONITOR	Stream all commands processed by Redis in real-time
CLIENT LIST	List connected clients and their details
SLOWLOG GET	Retrieve slow queries logged by Redis
CONFIG GET *	View current Redis configuration settings

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Key Takeaways

Use the INFO command to get detailed Redis server statistics.

Use MONITOR carefully as it streams all commands and can impact performance.

CLIENT LIST helps identify connected clients and troubleshoot issues.

External tools like RedisInsight provide user-friendly monitoring dashboards.

Regularly check slow logs with SLOWLOG GET to find performance bottlenecks.