How to configure Lua script execution time in centos redis

On CentOS systems, you can limit the execution time of Lua scripts by modifying Redis configuration files or using Redis commands to prevent malicious scripts from consuming too much resources.

Method 1: Modify Redis configuration file

1. Positioning Redis configuration files: The Redis configuration files are usually located in /etc/redis/redis.conf .

2. Edit configuration file: Open the configuration file using a text editor (such as vi or nano ):

    sudo vi /etc/redis/redis.conf

3. Set the execution time limit of Lua script: Add or modify the following lines in the configuration file to set the maximum execution time of Lua script (unit: milliseconds):

    <code>lua-time-limit 5000</code>

   This setting limits the maximum execution time of Lua scripts to 5 seconds. You can adjust this value according to actual needs.

4. Save and exit: Save and close the configuration file.

5. Restart Redis service: To make the changes take effect, you need to restart Redis service:

    sudo systemctl restart redis

Method 2: Dynamically set using Redis command

If you do not want to modify the configuration file, you can also use the Redis command to dynamically set the Lua script execution time limit:

1. Connect to the Redis server: Use redis-cli to connect to the Redis server:

    redis-cli

2. Set execution time limit: Use CONFIG SET command to set the maximum execution time of Lua scripts:

    <code>CONFIG SET lua-time-limit 5000</code>

   Similarly, 5000 represents a 5-second execution time limit.

Verify settings

You can verify that the settings are effective using the following command:

 CONFIG GET lua-time-limit

This command will return the value of the current Lua script execution time limit.

Important tips:

• The Lua script execution time limit is set to protect Redis server resources and prevent long-running scripts from causing service paralysis.
• Reasonable setting of execution time limits is not only to ensure the normal operation of the script, but also to avoid excessive resource consumption.
• If the script execution time exceeds the set limit, Redis will terminate the script execution and return an error.

Through the above steps, you can effectively limit the execution time of Lua scripts in Redis on CentOS system. Please select the appropriate method and adjust the execution time limit according to your actual application needs.

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