How to view versions of Redis through client tools

Checking Redis Version Using Client Tools

This question focuses on how to retrieve the Redis server version using various client tools. There are several methods, depending on the client you're using. The most straightforward approach is usually a direct command sent to the Redis server.

Checking Redis Version Using the INFO Command

The most common and universally supported method across all Redis clients is to use the INFO command. This command provides extensive information about the Redis server, including its version. Simply connect to your Redis server using your preferred client (e.g., redis-cli, a Python client like redis-py, etc.) and execute the INFO command.

The output will be a large block of text containing various server statistics. Look for a line that starts with redis_version:. The value following the colon is the Redis server version number. For example:

<code>redis_version:7.0.10</code>

This method is reliable and works regardless of the specific client you're using, as the INFO command is a core Redis command. You can even pipe the output to grep to filter for the version specifically:

<code class="bash">redis-cli INFO | grep redis_version</code>

Determining the Redis Server Version from Your Client

Determining the Redis server version from your client itself, without directly querying the server, is generally not possible. The client doesn't inherently "know" the server's version until it connects and retrieves information, usually through the INFO command or a similar mechanism. The client library might offer methods to retrieve connection details, but the version itself will be a server-side property.

Client Commands to Display Redis Version Information

While the INFO command is the primary method, there isn't a dedicated command solely for displaying the Redis version. The INFO command provides a comprehensive overview, and extracting the version from its output is the standard practice. Other commands don't directly return the version number. Attempting to parse other INFO sections (like client, memory, etc.) wouldn't reliably give you the version.

Different Ways to Get the Redis Version Number Using a Client

The methods largely revolve around using the INFO command, but the way you interact with it varies depending on your client:

• redis-cli (command-line client): Simply type redis-cli INFO and examine the output. Piping to grep as shown above can refine the output.
• Python (redis-py client): You would use the client's connection object to execute the INFO command and parse the response. For example:

<code>redis_version:7.0.10</code>

• Other clients (Node.js, Java, etc.): Each client library will have its own method for executing commands, but the underlying principle remains the same: execute the INFO command and parse the response to extract the redis_version value. Consult the documentation for your specific client library for details.

In summary, while the specific implementation differs based on the client, the core concept remains consistent: utilize the INFO command to obtain the server's version information.

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