How to view version using INFO command in Redis

Checking Redis Version: A Comprehensive Guide

This article addresses various methods for determining the Redis server version you're connected to, focusing on the INFO command and exploring alternative approaches.

Redis how to use INFO command to view version

The INFO command in Redis is a versatile tool that provides a wealth of information about the server's status and configuration. To specifically view the Redis version, you can use the INFO command alone, or more specifically, INFO server. The output will contain a line that explicitly states the version.

For example, connecting to your Redis server via the redis-cli command-line tool, you would execute:

redis-cli INFO

or, for a more concise output focusing solely on server information:

redis-cli INFO server

The output will resemble this (the version number will differ depending on your installation):

<code># Server
redis_version:6.2.6
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:6d03a23a05373240
redis_mode:standalone
os:Linux 5.15.0-76-generic x86_64
arch_bits:64
multiplexing_api:epoll
gcc_version:11.3.0
process_id:12345
run_id:67890abcdef
tcp_port:6379
uptime_in_seconds:3600
uptime_in_days:0
hz:10
configured_hz:10
lru_clock:1678901234
executable:redis-server
config_file:/etc/redis/redis.conf</code>

The redis_version line clearly indicates the Redis version. The other lines provide additional details about the server's environment and configuration.

How can I determine the Redis server version I'm connected to?

The primary and most straightforward way to determine the Redis server version is by using the INFO command as detailed above. This command provides a comprehensive overview of the server's state, including the version number. This method is preferred because it’s directly supported by Redis and provides other valuable information alongside the version.

What information does the Redis INFO command provide besides the version?

The INFO command offers a wealth of information beyond just the version number. The output is structured into sections, each providing details on a specific aspect of the Redis server. Key sections and their information include:

• server: General server information like version, process ID, uptime, OS, and architecture.
• clients: Statistics on connected clients, including the number of clients and their connection details.
• memory: Details about memory usage, including used memory, peak memory, and memory fragmentation.
• persistence: Information about persistence mechanisms (RDB and AOF), including last save time and disk usage.
• stats: General server statistics, such as the number of commands processed and key evictions.
• replication: Information about replication if the server is a master or slave.
• cpu: CPU usage statistics.
• cluster: Information about the cluster state if the server is part of a Redis Cluster. (Only available in clustered deployments).
• keyspace: Details about the number of keys in each database.

You can obtain specific sections by appending the section name to the INFO command (e.g., INFO memory, INFO clients). Running INFO without any arguments provides all sections.

Are there alternative methods to check the Redis version besides using the INFO command?

While the INFO command is the recommended approach, a few alternative methods exist, though they are less direct and comprehensive:

• Checking the redis-server executable: You could inspect the redis-server executable itself, often found in /usr/local/bin or /usr/bin. The version information might be embedded within the executable's metadata (though accessing this varies depending on your OS and tools). This method is not reliable as it doesn't necessarily reflect the running instance's version.
• Examining configuration files: The Redis configuration file (redis.conf) might contain a comment or setting indicating the version used during installation, but this is not guaranteed and unreliable.
• Using a Redis administration tool: Many GUI-based Redis administration tools automatically display the server version upon connection. However, this approach relies on an external tool.

In summary, using the INFO command (specifically INFO server) is the most efficient, reliable, and recommended way to determine the Redis server version. It provides the version information directly and alongside a wealth of other valuable server details.

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